add simple quote message context menu

ec0042081e Add .gitattributes file
a5d9db0cd0 cmake: build tests for UWP
b7889a7389 winrt: use windowsio in non-libc mode
ea8757a748 Make testaudiostreamdynamicresample compatible with emscripten
1a7a74fb2e cmake: build emscripten tests as html page
64d570f027 Add minimal http server for emscripten test apps
8e898c4a21 SDL_test does not parse --samples argument
91cd5478be audio: Fix resampler overflowing input buffer.
f290c85b22 testaudiocapture: Make sure we convert captured audio to output format.
b75c751dfc rwlock: Make generic implmentations work on single-threaded platforms.
80850af7ce The controller update complete events are no longer disabled by default
3f486224a9 Fixed refresh rate calculation for KMSDRM
342ec51131 Fix overflow when doing SDL_sscanf("%hd", ...)
9129e1d557 Fixed crash when setting the default cursor twice
8e99a4f4f5 Undo variable rename
be67f0de10 Fixed crashes related to the default cursor on WinRT and KMSDRM
94b3f78c44 Fix out of bound read of 'has_hat' array
94f48f19b0 Use more specific build destinations when creating an xcframework
dabd45997e Back out change supporting multiple names for binding elements
efe15588d5 Relabel back paddles as left or right
be884f0c95 ci: disable visionos.yml by renaming the file
ac094d00f5 ci: add workflow_dispatch event to visionos workflow
9be9e2292b build: Consistently use pathlib APIs in cmake/xxd.py
a9f6950657 Fixed deadlock shutting down Android sensors
d9f09e77f2 Actually make the sensors magical!
690eae7d22 Implement visionOS support
e385d6da0a Fixed build warning
6b93e788fa Improved sensor thread-safety
4ee0e5a984 Fixed thread-safety warnings
12deed91f8 Added information on how to enable thread-safety analysis
5735d2b03b coreaudio: Fixed assertion when device fails/quits mid-iteration.
1022fd6e04 testaudio: the test framework opens an audio device at startup; close it.
0714da37a4 audio: Fix audio stream callback calculations when future buffer has space.
917e036f6f MSVC has __declspec(deprecated)
279ff8909f Changed example code to avoid potential divide by zero
8a1afc9b10 Fixed Android not sending controller event timestamps
463c456b98 Fill the correct member with the joystick ID in SDL_EVENT_JOYSTICK_UPDATE_COMPLETE
55cf1abaa6 test: Don't flag testsurround as suitable for non-interactive use
a2d594269c Fixed pixel format compatibility with SDL2
79a190aa23 Fixed setting invalid bpp for FOURCC formats in SDL_GetMasksForPixelFormatEnum()
8fdebdd3e0 Sync SDL3 wiki -> header
b903ccf945 SDL_rwops read/write functions return size_t again
c03f5b4b69 Fixed rounding up in SDL_PrintFloat
75a020aa6b Only query serial number and firmware versions from Sony PS5 controllers
fa189d302e Added the Victrix Pro FS for PS4/PS5 to the controller list
26205b659d Fixed PS4/PS5 touchpad for third party controllers
6af0448af9 include: fixed a typo in SDL_RenderGetMetalCommandEncoder docs.
f3cb46b083 SDL_thread.h: do not conflict with sdl2-compat::sdl3_include_wrapper.h
080b1dfbdb Revert "Improved fallback for SDL_COMPILE_TIME_ASSERT() (thanks @icculus!)"
9d453daa23 Improved fallback for SDL_COMPILE_TIME_ASSERT() (thanks @icculus!)
1fb2419882 Removed reference to renamed function
e7d56dd0b2 audio: Renamed new API SDL_UnpauseAudioDevice to SDL_ResumeAudioDevice.
2b0c0f5b6b Don't pass NULL to strncmp
778e8185cd Fix size of memcpy in SDL_AudioDeviceFormatChangedAlreadyLocked And add diagnostic that allows to find this kind of issue in clang-tidy
4bb426abad Sync SDL3 wiki -> header
3a752ce650 Reapply "Changed 'freesrc' parameter from int to SDL_bool" to SDL_wave.c
2ba03b4db0 fix build after previous commit.
0026adffd4 apply force_align_arg_pointer attribute to correct version of SDL_RunApp
77446e2029 Unaligned stacks on i686-w64-mingw32 may lead to crashes
d3bcc3f057 Fixed build errors when OpenGL isn't enabled
35ad68e126 Sync SDL3 wiki -> header
70323a8350 Add a function to display the system menu for a window
be5f66c84e testaudio: Fixed soundboard icon, which had a colorkey issue.
c0a88930bf Sync SDL3 wiki -> header
18c59cc969 Merge the SDL3 audio subsystem redesign!
99b0e31788 The Steam Controller D-Pad is only pressed when the button is pressed down
103073d694 Set NSBluetoothAlwaysUsageDescription for testcontroller
ca02bb6c8c We don't need testdropfile-Info.plist
e063f662e9 Enable the controller update complete events
06bea1eb55 Added a gamepad mapping for the G-Shark GS-GP702
5ca3c50bf0 testaudio: Fix compiler warning.
1b1f02c5aa testaudio: Apparently compilers don't like this possibly being NULL now...?
2de9253b6c test: Added testaudio
fb3ab3f113 SDL_video.c: move ngage video before offscreen.
843572d993 Don't mark autorelease keys as virtual
648de4f9b8 Fixed duplicate key press/release events on iOS
a8abe612ed Only pass keypresses up the responder chain when text input is active
c3288d113e Synchronize on-screen keyboard state with text input active state
5fb92ef2f7 Fixed whitespace
f5ea6ae18d Revert "Stop beep when running iOS apps on ARM-based Macs"
546508b9b4 Allow test programs to run at full resolution on iPads
68a4bb01e0 Allocate displays as an array of pointers instead of an array of objects
07578fde3d Fixed crash if a display is enumerated twice
a509771a87 fix ios CI workflow after commit e4460e897f
72ce76905a The scheme isn't always the same as the framework name (e.g. xmp_lite vs xmp-lite)
e4460e897f By default Xcode expects the framework target name to be the name of the project.
ac683773dc Added missing tests to the "All" target
7dd56eaafe Removed unnecessary reference to testoverlay-Info.plist
e1c7f524ef Reduce the number of times SDL3 is duplicated in the xcframework script
65538011ca Make Xcode targets more specific
efe114c300 Revert "Renamed the xcframework target from "SDL.xcframework" to "xcframework""
73ed1d21a9 Renamed the xcframework target from "SDL.xcframework" to "xcframework"
76b4d8a0d8 Build the Framework instead of a static library for iOS and tvOS
d1bf979160 Removed unnecessary setting from the "Create DMG" target
c94cb3a5d8 Simplified the Xcode project to a single Framework target
ea60474c65 cmake: don't build SDL3-static Apple framework
8f00d7856d Sync SDL3 wiki -> header
d4a867a256 Rename SDL_GetPath to SDL_GetUserFolder
71099149b8 Fall back to Xlib if XRandR isn't available
b7f32f74ce Note the removal of the SDL_RENDERER_TARGETTEXTURE flag
0eda582160 testaudiostreamdynamicresample: Load sample.wav correctly.
87eae9a0a1 aaudio: We need a mixbuf on capture devices, too.
fb68e84646 wayland: Fix memory leaks
b0edd23c00 testsurround: Log available audio output devices at the start.
ae3090c387 androidaudio: Move Init/bootstrap code to bottom of source code.
18fc0db9e5 aaudio: Rearranged source code to match other backends.
2507c1d68b aaudio: Disconnect playing devices if error callback fires.
32a3fc3783 aaudio: Use the callback interface.
b49ce86765 audio: Fixed compiler warning on Android NDK.
1c074e8d97 android: Fixed audio device detection.
82ce05ad01 pulseaudio: Be more aggressive with hotplug thread synchronization.
5cbdf1168e androidaudio: Fixed incorrect JNI call (thanks, @madebr!)
660054f3dc include: Correct comment about audio device hotplug events.
ab68428a64 aaudio: Fixed for older SDKs and Android releases.
5ff87c6d4a android: Reworked audio backends for SDL3 audio API.
54af687210 testautomation_audio.c: Patched to compile.  :/
5e82090662 testautomation_audio.c: Apparently we aren't updating test code for C99 atm.
7f4488f625 wasapi: More fixes for Clang warnings.
29a0c689c9 wasapi: Patched to compile with Clang.
4aa95c21bc pspaudio: Patched to compile.
9a2a0a1463 ps2audio: Delete errant character that got inserted before previous commit.
2c578bd0d5 qnxaudio: Rewrite for SDL3 audio APIs.
455eef4cd9 audio: Use AtomicAdd for device counts, don't treat as a refcount.
095ea57f94 pspaudio: Patched to compile.
d7cf63db67 ps2audio: Patched to compile.
027b9e8787 coreaudio: (maybe) patched to compile on iOS.
4836c2db07 pspaudio: Patched to compile.
86ca412436 n3dsaudio: Patched to compile.
66bcee2ca9 testaudiostreamdynamicresample.c: Fixed MSVC compiler warning.
dbf993d358 vitaaudio: patched to compile.
5707e14716 audio: Fix up some things that broke when rebasing the branch against main.
6567285eae SDL_migration.cocci: Fix up SDL_(Pause|Unpause)Audio.
0b6255551e test: Fixed incorrect SDL_OpenAudioDevice call in testautomation.
107fd941cd vitaaudio: Clean up correctly in CloseDevice.
9fa4a6ef87 netbsdaudio: Minor fix.
b0d89868c6 n3dsaudio: Updated (but untested!) for SDL3 audio API.
ba27176106 vitaaudio: Untested attempt to move Vita audio to SDL3's audio API.
0b58e96d9e wasapi: Patched WinRT to compile.
d6b4f48488 visualc: Turn on multiprocessor compilation.
c58d95c343 wasapi: Reworked for new SDL3 audio API, other win32 fixes.
dc04f85646 audio: whoops, that should be an int.
be0dc630b7 audio: Fixed incorrect assertion
77b3fb06ee directsound: First shot at updating for SDL3 audio API.
4399b71715 audio: Generalize how backends can lookup an SDL_AudioDevice.
2fb122fe46 audio: backends now "find" instead of "obtain" devices by handle.
c3f5a5fc72 dummyaudio: SDL3ify style
7d65ff86e2 diskaudio: Adjusted for later SDL3 audio API redesign changes.
4ba9c2eade dummyaudio: Configurable delay, other SDL3 API fixes.
fb395d3ad7 sndio: Updated to the SDL3 audio API.
1a55282051 dsp: Some minor logic fixes
6bc85577d7 netbsdaudio: Updated for SDL3 audio API.
0f6e59312b netbsdaudio: Removed email address from source code.
51ae78c0af haikuaudio: Updated for SDL3 audio API.
fc7ed18ca1 emscriptenaudio: don't forget to finalize the audio thread
4233c41ce2 pulseaudio: Removed unnecessary variable.
a0528cd5ed emscriptenaudio: Updated for SDL3 audio API.
79cc29ba35 wave: Don't check if format->channels > INT_MAX, it's a Uint16.
1bfe97c235 pspaudio: Updated for SDL3 audio API.
121a2dce15 audio: Make sure `device->hidden` is NULL after CloseDevice
3d6ba0cafd ps2audio: Removed free of buffer that hasn't been allocated yet.
00ed6f8827 test: Fixed compiler warnings for unused vars.
6f12f68ec9 ps2audio: SDL3ified the style
4993743a02 ps2audio: Renamed `_this` to `device`
74568cdb2b ps2audio: Updated (but untested) for SDL3 audio API.
c83b68ef26 jack: renamed `_this` to `device`.
3f4f004794 audio: Remove an assertion that no longer makes sense.
86243b2589 jack: Use ProvidesOwnCallbackThread.
18906a32b8 jack: First shot at updating for SDL3 audio API.
a2b488359e dsp: Removed debug logging
6fd71185cd dsp: Updated for new SDL3 audio API.
3482d1215a alsa: Don't ever block in CaptureFromDevice.
65d296ef1a audio: Use SDL_powerof2 instead of reinventing it.
409b544505 alsa: Updated for new SDL3 audio API
0999a090a7 audio: More tweaking of `device->thread_alive`
f94ffd6092 audio: Fixed logic error
4deb2970c9 alsa: Renamed `_this` to `device`
0fb9e4baae audio: Remove no-longer-used SupportsNonPow2Samples
c653e57768 coreaudio: rewritten for SDL3 audio redesign!
533777eff5 audio: SDL_sysaudio.h comment conversion.
8473e522e0 audio: unify device thread naming.
258bc9efed audio: PlayDevice now passes the buffer, too, for convenience.
e518149d14 audio: Fixed locking in SDL_AudioDeviceDisconnected
22afa5735f audio: FreeDeviceHandle should pass the whole device, for convenience.
9e3c5f93e0 coreaudio: Change `_this` to `device`
e969160de0 audio: unset a freed variable to NULL
1fc01b0300 audio: Try to definitely have a default device set up.
b60a56d368 audio: take first reported device if no default was specified.
a8323ebe68 audio: Better handling of ProvidesOwnCallbackThread backends.
1dffb72c1d pipewire: Hooked up default device change notifications.
a93fcf2444 audio: fixed flushed stream reporting bytes but not being able to get them.
ad6c1781fc pulseaudio: Minor cleanups.
cfc8a0d17d pipewire: First shot at moving to the new SDL3 audio interfaces.
13202642a3 aaudio: Fixed capitialization, plus some minor cleanups.
3e9991b535 audio: Make sure we don't write to a NULL pointer.
943351affb pulseaudio: GetDefaultAudioInfo isn't a thing anymore.
11dfc4d737 test: Update testautomation_audio for SDL3 audio API.
29afc2e42b test: Update testresample for SDL3 audio API.
3a02eecced test: Update testsurround for SDL3 audio API.
e1c78718d4 test: testaudiocapture is updated for the SDL3 audio API.
f48cb716c2 pulseaudio: a couple minor tweaks.
dac25fe9eb audio: Seperate audio capture into Wait/Read operations.
3e10c0005d audio: Capture devices should respect logical device pausing.
7e700531c5 audio: Allow SDL_OpenAudioDevice to accept a NULL spec.
bb1cbbd33a test: Update testaudioinfo for SDL3 audio API.
883aee32c5 audio: Let default formats differ for output and capture devices.
62cf24eeb9 pulseaudio: Listen for server events in addition to sources and sinks.
924f370bd7 pulseaudio: Fix deadlock in HotplugThread.
5d4e9e5f80 test: Updated testaudiostreamdynamicresample to SDL3 audio API.
f883b9fc64 test: Updated testaudiohotplug to SDL3 audio API.
2be5f726d4 audio: Removed debug logging.
323ecce123 docs: Added migration note about SDL_AUDIODEVICEREMOVED.
47b0321ebf test: Removed loopwavequeue.c; obsolete in SDL3.
0e5a1d4f29 pulseaudio: Removed debug logging.
f598626e46 test: loopwave shouldn't use an audiostream callback.
eee407caf8 docs: migration guide note that SDL_LoadWAV has a different return type.
b03c493fc4 test: Updated testmultiaudio to new SDL3 audio API
fe1daf6fb5 audio: Mark disconnected default devices as "zombies".
cdd2ba81de audio: Fixed adding new physical devices to a double-linked list.
db39cbf208 audio: Allow SDL_GetAudioDeviceFormat() to query the default devices.
ee10bab3cd audio: An enormous amount of work on managing default devices.
c7a44eea83 audio: Fixed logic error.
089cd87cb5 audio: Make sure device count stays correct as hardware disconnects.
e50cb72eb6 docs: Note that audio opening doesn't implicitly init SDL now.
97b2f747d0 docs: Corrections to audio section of README-migration.md
464640440f audio: Added SDL_GetAudioStreamBinding.
01f7b53865 audio: Readded (logical) device pausing.
fd4c9f4e11 audio: documentation improvements.
4b78b789a7 audio: Switch SDL_audio.c and SDL_audiocvt.c to C99-ish syntax.
d96a1db7d7 audio: Opening via a logical device ID should also track default device.
b2e020958f audio: Wrap device access in opening of logical devices.
7ee2459927 audio: Check for unlikely failure case in WAV loaded.
3d65a2cefe audio: Made SDL_LoadWAV a real function, not just a macro.
26525f5fd3 audio: Readd SDL_AudioSpec, but just with format/channels/freq fields.
e6aaed7d79 include: Audio is not, and has not been, a raw mixing buffer for a long time.
56b1bc2198 audio: SDL_AudioStream now has callbacks for Get and Put operations.
905c4fff5b audio: First shot at the SDL3 audio subsystem redesign!
b221b59995 cmake: add SDL_REVISION option
0500fca00c Add missing break
d3f2de7f29 fixed typo in prev. patch.
12b35c6a46 test/testnativecocoa.m: fixed deprecation warnings.
e24b3e2fa4 cmake: rename SDL_TEST -> SDL_TEST_LIBRARY
da5016d336 cmake: use pkg-config + test compile instead of Find module for detecting rpi
deec574ff6 cmake: fix SDL_HIDAPI_LIBUSB
f2ae00c1ad Sync SDL3 wiki -> header
41a96c8133 doc: document building of SDL tests with CMake
3174d0b970 Sorted controller list
27b8abb056 Add Steam Deck controller mapping to database.
41d436f0fe Use SetWindowPos to show windows when SDL_HINT_WINDOW_ACTIVATE_WHEN_SHOWN is set to avoid activating the parent window when showing a child window
0dc85f3078 Improved the documentation for the gamepad paddle buttons
2fff999a41 Try to create the dummy mouse cursor after video backend initialization
d086d9874d Sync SDL3 wiki -> header
bce598addd SDL_pixels.c: Fixed compiler warning on Android NDK.
ad0c0d3cde Sync SDL3 wiki -> header
f8e8dff7ee tests: Fix automated window grab and positioning tests under Wayland/XWayland
4cffbc3644 Add VS code directory to gitignore
666f81bace Add more endian-specific aliases for 32 bit pixelformats
4749df0a63 Just disable the 4214 warning instead of trying to change the structure definition

git-subtree-dir: external/sdl/SDL
git-subtree-split: ec0042081ea104d5dd0ee291105210e00a4fe3d9

.circleci/bazel-test

@@ -1,12 +0,0 @@
-#!/bin/sh
-
-set -eux
-
-git submodule update --init --recursive
-/src/workspace/tools/inject-repo c-toxcore
-# TODO(iphydf): Re-enable fuzz-test when https://github.com/tweag/rules_nixpkgs/issues/442 is fixed.
-cd /src/workspace && bazel test -k \
-  --build_tag_filters=-haskell,-fuzz-test \
-  --test_tag_filters=-haskell,-fuzz-test \
-  -- \
-  "$@"

.cirrus.yml

@@ -1,79 +0,0 @@
----
-bazel-opt_task:
-  container:
-    image: toxchat/toktok-stack:latest-release
-    cpu: 2
-    memory: 2G
-  configure_script:
-    - git submodule update --init --recursive
-    - /src/workspace/tools/inject-repo c-toxcore
-    - sed -i -e 's/build --config=remote/#&/' /src/workspace/.bazelrc.local
-  test_all_script:
-    - cd /src/workspace && bazel test -k
-        --build_tag_filters=-haskell
-        --test_tag_filters=-haskell
-        --
-        //c-toxcore/...
-        -//c-toxcore/auto_tests:tcp_relay_test # Cirrus doesn't allow external network connections.
-
-bazel-dbg_task:
-  container:
-    image: toxchat/toktok-stack:latest-debug
-    cpu: 2
-    memory: 2G
-  configure_script:
-    - git submodule update --init --recursive
-    - /src/workspace/tools/inject-repo c-toxcore
-  test_all_script:
-    - cd /src/workspace && bazel test -k
-        --build_tag_filters=-haskell
-        --test_tag_filters=-haskell
-        --remote_http_cache=http://$CIRRUS_HTTP_CACHE_HOST
-        --
-        //c-toxcore/...
-        -//c-toxcore/auto_tests:tcp_relay_test # Cirrus doesn't allow external network connections.
-
-cimple_task:
-  container:
-    image: toxchat/toktok-stack:latest-release
-    cpu: 2
-    memory: 4G
-  configure_script:
-    - git submodule update --init --recursive
-    - /src/workspace/tools/inject-repo c-toxcore
-    - sed -i -e 's/build --config=remote/#&/' /src/workspace/.bazelrc.local
-  test_all_script:
-    - cd /src/workspace && bazel test -k
-        --build_tag_filters=haskell
-        --test_tag_filters=haskell
-        --
-        //c-toxcore/...
-
-freebsd_task:
-  freebsd_instance:
-    image_family: freebsd-14-0
-  configure_script:
-    - PAGER=cat ASSUME_ALWAYS_YES=YES pkg install
-        cmake
-        git
-        gmake
-        googletest
-        libconfig
-        libsodium
-        libvpx
-        opus
-        pkgconf
-    - git submodule update --init --recursive
-  test_all_script:
-    - |
-      # TODO(iphydf): Investigate FreeBSD failures on these tests.
-      sed -Ei -e '/\(dht_getnodes_api\)/s/^/#/' auto_tests/CMakeLists.txt
-      cmake . \
-        -DMIN_LOGGER_LEVEL=TRACE \
-        -DMUST_BUILD_TOXAV=ON \
-        -DNON_HERMETIC_TESTS=OFF \
-        -DTEST_TIMEOUT_SECONDS=50 \
-        -DUSE_IPV6=OFF \
-        -DAUTOTEST=ON
-      cmake --build . --target install
-      ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6

.clang-tidy

@@ -1,49 +0,0 @@
-# vim:ft=yaml
-HeaderFilterRegex: "/c-toxcore/[^/]+/[^.].+"
-CheckOptions:
-  - key:             readability-identifier-naming.ClassCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.ConstantCase
-    value:           lower_case
-  # bootstrap-daemon has these.
-  - key:             readability-identifier-naming.ConstantIgnoredRegexp
-    value:           "^NAME_.*"
-  - key:             readability-identifier-naming.EnumCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.EnumConstantCase
-    value:           UPPER_CASE
-  - key:             readability-identifier-naming.FunctionCase
-    value:           lower_case
-  - key:             readability-identifier-naming.GlobalConstantCase
-    value:           lower_case
-  - key:             readability-identifier-naming.MemberCase
-    value:           lower_case
-  - key:             readability-identifier-naming.MacroDefinitionCase
-    value:           UPPER_CASE
-  - key:             readability-identifier-naming.MacroDefinitionIgnoredRegexp
-    value:           "^_.*|bitwise|force|nullable|non_null|nullptr|static_assert|ck_.*"
-  - key:             readability-identifier-naming.ParameterCase
-    value:           lower_case
-  - key:             readability-identifier-naming.StructCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.TypedefCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.TypedefIgnoredRegexp
-    value:           ".*_cb"
-  - key:             readability-identifier-naming.UnionCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.VariableCase
-    value:           lower_case
-
-  - key:             llvmlibc-restrict-system-libc-headers.Includes
-    value:           "alloca.h,arpa/inet.h,assert.h,ctype.h,errno.h,fcntl.h,getopt.h,libconfig.h,limits.h,linux/if.h,math.h,netdb.h,netinet/in.h,opus.h,pthread.h,signal.h,sodium/crypto_scalarmult_curve25519.h,sodium.h,sodium/randombytes.h,stdarg.h,stdbool.h,stddef.h,stdint.h,stdio.h,stdlib.h,string.h,sys/ioctl.h,syslog.h,sys/resource.h,sys/socket.h,sys/stat.h,sys/time.h,sys/types.h,time.h,unistd.h,vpx/vp8cx.h,vpx/vp8dx.h,vpx/vpx_decoder.h,vpx/vpx_encoder.h,vpx/vpx_image.h"
-  - key:             hicpp-signed-bitwise.IgnorePositiveIntegerLiterals
-    value:           true
-  - key:             concurrency-mt-unsafe.FunctionSet
-    value:           posix
-  - key:             readability-function-cognitive-complexity.Threshold
-    value:           153  # TODO(iphydf): Decrease. tox_new is the highest at the moment.
-  - key:             cppcoreguidelines-avoid-do-while.IgnoreMacros
-    value:           true
-  - key:             readability-simplify-boolean-expr.SimplifyDeMorgan
-    value:           false

.devcontainer/devcontainer.json

@@ -1,11 +0,0 @@
-{
-	"image": "mcr.microsoft.com/devcontainers/universal:2",
-	"features": {
-		"ghcr.io/devcontainers-contrib/features/bash-command:1": {
-			"command": "git submodule update --init --recursive"
-		},
-		"ghcr.io/devcontainers-contrib/features/apt-packages:1": {
-			"packages": "libconfig-dev,libopus-dev,libvpx-dev,ninja-build"
-		}
-	}
-}

.dockerignore

@@ -1,2 +0,0 @@
-/_build
-/_install

.github/scripts/cmake-alpine-s390x

@@ -1,55 +0,0 @@
-#!/bin/bash
-# Copyright (C) 2018-2023 nurupo
-
-# Toxcore building
-
-set -eux
-
-cd .. # /work
-. cmake-alpine-run.sh
-
-# === Get VM ready to build the code ===
-
-start_vm
-
-RUN apk add cmake g++ ninja
-
-mv c-toxcore /
-
-# Copy over toxcore code from host to qemu
-scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -P "$SSH_PORT" -r /c-toxcore root@localhost:~
-
-cd /c-toxcore
-. ".github/scripts/flags-gcc.sh"
-
-# Make compilation error on a warning
-add_flag -Werror
-
-# - disabling toxav because vpx doesn't work on s390x.
-# - disabling bootstrap daemons because we don't need them for testing (saving time).
-# - disabling shared libraries because it saves a lot of time on building PIC objects.
-# - enable unity build because it saves a lot of time as well (fewer objects to build).
-RUN "cmake -B_build -Hc-toxcore -GNinja \
-  -DCMAKE_C_FLAGS='$C_FLAGS' \
-  -DCMAKE_CXX_FLAGS='$CXX_FLAGS' \
-  -DCMAKE_EXE_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_SHARED_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_INSTALL_PREFIX:PATH='_install' \
-  -DCMAKE_UNITY_BUILD=ON \
-  -DMIN_LOGGER_LEVEL=TRACE \
-  -DNON_HERMETIC_TESTS=ON \
-  -DENABLE_SHARED=OFF \
-  -DBUILD_TOXAV=OFF \
-  -DDHT_BOOTSTRAP=OFF \
-  -DBOOTSTRAP_DAEMON=OFF \
-  -DSTRICT_ABI=ON \
-  -DTEST_TIMEOUT_SECONDS=90 \
-  -DUSE_IPV6=OFF \
-  -DAUTOTEST=ON"
-
-RUN 'cmake --build _build --parallel 2 --target install -- -k 0'
-RUN 'cd _build && ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:1 --timeout 90 || true' &
-
-# Give the tests 5 minutes to run. Sometimes, the per-test timeout doesn't
-# work, so we put a global timeout here for everything.
-sleep 300

.github/scripts/cmake-freebsd

@@ -1,58 +0,0 @@
-#!/bin/bash
-# Copyright (C) 2018-2023 nurupo
-
-# Toxcore building
-
-set -eux
-
-cd .. # /work
-. cmake-freebsd-run.sh
-
-# === Get VM ready to build the code ===
-
-# Unpack image only if it's compressed.
-if [ -f "$IMAGE_NAME.gz" ]; then
-  gunzip "$IMAGE_NAME.gz"
-fi
-
-mv c-toxcore /
-
-start_vm
-
-# Copy over toxcore code from host to qemu
-scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -P "$SSH_PORT" -r /c-toxcore root@localhost:~
-
-RUN ls -lh
-
-cd /c-toxcore
-. '.github/scripts/flags-clang.sh'
-
-add_ld_flag -Wl,-z,defs
-
-# Make compilation error on a warning.
-add_flag -Werror
-
-# This triggers on FreeBSD's clang.
-add_flag -Wno-format
-add_flag -Wno-unsafe-buffer-usage
-
-RUN "cmake -B_build -Hc-toxcore \
-  -DCMAKE_C_FLAGS='$C_FLAGS' \
-  -DCMAKE_CXX_FLAGS='$CXX_FLAGS' \
-  -DCMAKE_EXE_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_SHARED_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_INSTALL_PREFIX:PATH='_install' \
-  -DMIN_LOGGER_LEVEL=TRACE \
-  -DMUST_BUILD_TOXAV=ON \
-  -DNON_HERMETIC_TESTS=ON \
-  -DSTRICT_ABI=ON \
-  -DTEST_TIMEOUT_SECONDS=120 \
-  -DUSE_IPV6=OFF \
-  -DAUTOTEST=ON"
-
-# We created the VM with the same number of cores as the host, so the host-ran `nproc` here is fine.
-RUN 'cmake --build _build --parallel "$NPROC" --target install -- -k'
-RUN 'cd _build && ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:2 --timeout 120 || true'
-
-# Gracefully shut down the VM.
-stop_vm

.github/workflows/cd.yml

@@ -0,0 +1,43 @@
+name: ContinuousDelivery
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  windows:
+    timeout-minutes: 15
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive
+
+    - name: Install Dependencies
+      run: vcpkg install libsodium:x64-windows-static pthreads:x64-windows-static
+
+    # setup vs env
+    - uses: ilammy/msvc-dev-cmd@v1
+      with:
+        arch: amd64
+
+    - name: Configure CMake
+      run: cmake -G Ninja -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows-static
+
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4
+
+    - uses: actions/upload-artifact@v3
+      with:
+        name: windows_msvc_x86-64
+        # TODO: do propper packing
+        path: |
+          ${{github.workspace}}/build/bin/
+

.github/workflows/ci.yml

@@ -1,200 +1,74 @@
-name: ci
+name: ContinuousIntegration
 
 on:
+  push:
+    branches: [ master ]
   pull_request:
-    branches: [master]
+    branches: [ master ]
 
-# Cancel old PR builds when pushing new commits.
+env:
-concurrency:
+  BUILD_TYPE: Debug
-  group: build-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
 
 jobs:
-  common:
+  linux:
-    uses: TokTok/ci-tools/.github/workflows/common-ci.yml@master
+    timeout-minutes: 10
 
-  analysis:
-    strategy:
-      fail-fast: false
-      matrix:
-        tool: [autotools, clang-tidy, compcert, cppcheck, doxygen, goblint, infer, freebsd, misra, modules, pkgsrc, rpm, slimcc, sparse, tcc, tokstyle]
     runs-on: ubuntu-latest
-    steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        with:
-          driver: docker
-      - name: Build toxchat/c-toxcore:sources
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/sources/sources.Dockerfile
-          tags: toxchat/c-toxcore:sources
-      - name: Docker Build
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/${{ matrix.tool }}/${{ matrix.tool }}.Dockerfile
 
-  coverage-linux:
-    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+    - uses: actions/checkout@v3
       with:
         submodules: recursive
-      - name: Build, test, and upload coverage
-        run: other/docker/coverage/run
 
-  generate-events:
+    - name: Install Dependencies
-    runs-on: ubuntu-latest
+      run: sudo apt update && sudo apt -y install libsodium-dev
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Run generate_event_c
-        run: |
-          other/event_tooling/run
-          git diff --exit-code
 
-  cimplefmt:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Run cimplefmt
-        run: other/docker/cimplefmt/run -u $(find tox* -name "*.[ch]")
-
-  build-android:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - run: .github/scripts/cmake-android armeabi-v7a
-      - run: .github/scripts/cmake-android arm64-v8a
-      - run: .github/scripts/cmake-android x86
-      - run: .github/scripts/cmake-android x86_64
-
-  build-macos:
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Build and test
-        run: .github/scripts/cmake-osx
-
-  build-windows-msvc:
-    strategy:
-      matrix:
-        version: [2019, 2022]
-    runs-on: windows-${{ matrix.version }}
-    env:
-      VCPKG_ROOT: "C:/vcpkg"
-      VCPKG_BINARY_SOURCES: "clear;x-gha,readwrite"
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Export GitHub Actions cache environment variables
-        uses: actions/github-script@v7
-        with:
-          script: |
-            core.exportVariable('ACTIONS_CACHE_URL', process.env.ACTIONS_CACHE_URL || '');
-            core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env.ACTIONS_RUNTIME_TOKEN || '');
     - name: Configure CMake
-        run: cmake --preset windows-default
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+
     - name: Build
-        run: cmake --build _build -j $([int]$env:NUMBER_OF_PROCESSORS+2)
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4
-      - name: Test
+
-        run: |
+  macos:
-          cd _build
+    timeout-minutes: 10
-          ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6 --build-config Debug
+
+    runs-on: macos-latest
 
-  build-netbsd:
-    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+    - uses: actions/checkout@v3
       with:
         submodules: recursive
-      - name: Test in NetBSD
-        id: test
-        uses: vmactions/netbsd-vm@v1
-        with:
-          usesh: true
-          copyback: false
-          prepare:
-            /usr/sbin/pkg_add
-              cmake
-              googletest
-              libconfig
-              libopus
-              libsodium
-              libvpx
-              pkg-config
 
-          run: |
+    - name: Install Dependencies
-            # TODO(iphydf): Investigate NetBSD failures on these tests.
+      run: brew install libsodium
-            sed -Ei -e '/\((TCP|dht_getnodes_api)\)/s/^/#/' auto_tests/CMakeLists.txt
+
-            cmake . \
+    - name: Configure CMake
-              -DMIN_LOGGER_LEVEL=TRACE \
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
-              -DMUST_BUILD_TOXAV=ON \
+
-              -DNON_HERMETIC_TESTS=ON \
+    - name: Build
-              -DTEST_TIMEOUT_SECONDS=90 \
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4
-              -DUSE_IPV6=OFF \
+
-              -DAUTOTEST=ON
+  windows:
-            cmake --build . --target install
+    timeout-minutes: 10
-            ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6
+
+    runs-on: windows-latest
 
-  build-freebsd:
-    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+    - uses: actions/checkout@v3
       with:
         submodules: recursive
-      - name: Test in FreeBSD
-        id: test
-        uses: vmactions/freebsd-vm@v1
-        with:
-          usesh: true
-          copyback: false
-          prepare:
-            PAGER=cat ASSUME_ALWAYS_YES=YES pkg install
-              cmake
-              git
-              gmake
-              googletest
-              libconfig
-              libsodium
-              libvpx
-              opus
-              pkgconf
 
-          run: |
+    - name: Install Dependencies
-            # TODO(iphydf): Investigate FreeBSD failures on these tests.
+      run: vcpkg install libsodium:x64-windows-static pthreads:x64-windows-static
-            sed -Ei -e '/\(dht_getnodes_api\)/s/^/#/' auto_tests/CMakeLists.txt
-            cmake . \
-              -DMIN_LOGGER_LEVEL=TRACE \
-              -DMUST_BUILD_TOXAV=ON \
-              -DNON_HERMETIC_TESTS=ON \
-              -DTEST_TIMEOUT_SECONDS=50 \
-              -DUSE_IPV6=OFF \
-              -DAUTOTEST=ON
-            cmake --build . --target install
-            ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6
 
-  mypy:
+    # setup vs env
-    runs-on: ubuntu-latest
+    - uses: ilammy/msvc-dev-cmd@v1
-    steps:
-      - uses: actions/checkout@v4
       with:
-          submodules: recursive
+        arch: amd64
-      - name: Set up Python 3.9
+
-        uses: actions/setup-python@v5
+    - name: Configure CMake
-        with:
+      run: cmake -G Ninja -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows-static
-          python-version: 3.9
+
-      - name: Install mypy
+    - name: Build
-        run: pip install mypy
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4
-      - name: Run mypy
+
-        run: |
-          (find . -name "*.py" -and -not -name "conanfile.py"; grep -lR '^#!.*python') \
-              | xargs -n1 -P8 mypy --strict

.github/workflows/post-submit.yml

@@ -1,43 +0,0 @@
-name: post-submit
-
-on:
-  push:
-    branches: [master]
-
-jobs:
-  build-alpine-s390x:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      - name: Docker Build
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/alpine-s390x/Dockerfile
-
-  docker-coverage:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        with:
-          driver: docker
-      - name: Login to DockerHub
-        if: ${{ github.event_name == 'push' }}
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Build toxchat/c-toxcore:sources
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/sources/sources.Dockerfile
-          tags: toxchat/c-toxcore:sources
-      - name: Build and push
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/coverage/coverage.Dockerfile
-          push: ${{ github.event_name == 'push' }}
-          tags: toxchat/c-toxcore:coverage
-          cache-from: type=registry,ref=toxchat/c-toxcore:coverage
-          cache-to: type=inline

.gitignore

@@ -1,101 +1,22 @@
-# OS files
+.vs/
-.DS_Store
-.DS_Store?
-._*
-.mypy_cache
-.Spotlight-V100
-.Trash*
-Icon?
-ethumbs.db
-Thumbs.db
-*.tmp
-
-# Make
-/_build
-/_install
-/tox-0.0.0*
-/.vs
-/CppProperties.json
-CMakeCache.txt
-CMakeFiles
-Makefile
-!/other/rpm/Makefile
-cmake_install.cmake
-install_manifest.txt
-tags
-Makefile.in
-CMakeLists.txt.user
-DartConfiguration.tcl
-CTestTestfile.cmake
-*.pc
-
-# Testing
-/amalgamation.*
-testing/data
-*~
-
-# Vim
-*.swp
-
-# Object files
 *.o
-*.lo
+*.swp
-*.a
+~*
-
+*~
-# Executables
-*.exe
-*.out
-*.app
-*.la
-
-# Libraries
-*.so
-
-# Misc (?)
-m4/*
-configure
-configure_aux
-!m4/pkg.m4
-aclocal.m4
-config.h*
-config.log
-config.status
-stamp-h1
-autom4te.cache
-libtool
-.deps
-.libs
-.dirstamp
-build/
-*.nvim*
-*.vim*
-
-# kdevelop
-.kdev/
-*.kdev*
-
-# VScode
-.vscode/
-
-# Netbeans
-nbproject
-
-# astyle
-*.orig
-
-# Android buildscript
-android-toolchain-*
-toxcore-android-*
-
-# cscope files list
-cscope.files
-
-# rpm
-tox.spec
-
-# clangd
-.cache/
-compile_commands.json
-
-/infer
 .idea/
+cmake-build-debug/
+cmake-build-debugandtest/
+cmake-build-release/
+*.stackdump
+*.coredump
+compile_commands.json
+/build*
+.clangd
+.cache
+
+.DS_Store
+.AppleDouble
+.LSOverride
+
+CMakeLists.txt.user*
+CMakeCache.txt

.gitmodules

@@ -1,3 +1,22 @@
-[submodule "third_party/cmp"]
+[submodule "external/toxcore/c-toxcore/third_party/cmp"]
-	path = third_party/cmp
+	path = external/toxcore/c-toxcore/third_party/cmp
-	url = https://github.com/camgunz/cmp
+	url = https://github.com/camgunz/cmp.git
+	shallow = true
+[submodule "external/solanaceae_toxcore"]
+	path = external/solanaceae_toxcore
+	url = https://github.com/Green-Sky/solanaceae_toxcore.git
+[submodule "external/solanaceae_util"]
+	path = external/solanaceae_util
+	url = https://github.com/Green-Sky/solanaceae_util.git
+[submodule "external/solanaceae_contact"]
+	path = external/solanaceae_contact
+	url = https://github.com/Green-Sky/solanaceae_contact.git
+[submodule "external/solanaceae_message3"]
+	path = external/solanaceae_message3
+	url = https://github.com/Green-Sky/solanaceae_message3.git
+[submodule "external/solanaceae_tox"]
+	path = external/solanaceae_tox
+	url = https://github.com/Green-Sky/solanaceae_tox.git
+[submodule "external/solanaceae_plugin"]
+	path = external/solanaceae_plugin
+	url = https://github.com/Green-Sky/solanaceae_plugin.git

CMakeLists.txt

@@ -1,610 +1,52 @@
-################################################################################
+cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
-#
-# The main toxcore CMake build file.
-#
-# This file when processed with cmake produces:
-# - A number of small libraries (.a/.so/...) containing independent components
-#   of toxcore. E.g. the DHT has its own library, and the system/network
-#   abstractions are in their own library as well. These libraries are not
-#   installed on `make install`. The toxav, and toxencryptsave libraries are
-#   also not installed.
-# - A number of small programs, statically linked if possible.
-# - One big library containing all of the toxcore, toxav, and toxencryptsave
-#   code.
-#
-################################################################################
 
-cmake_minimum_required(VERSION 3.16)
+# cmake setup begin
-cmake_policy(VERSION 3.16)
+project(tomato)
-project(toxcore)
 
-list(APPEND CMAKE_MODULE_PATH ${toxcore_SOURCE_DIR}/cmake)
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
-option(FLAT_OUTPUT_STRUCTURE "Whether to produce output artifacts in ${CMAKE_BINARY_DIR}/{bin,lib}" OFF)
+# defaulting to debug mode, if not specified
-if(FLAT_OUTPUT_STRUCTURE)
+if(NOT CMAKE_BUILD_TYPE)
-  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+	set(CMAKE_BUILD_TYPE "Debug")
-  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 endif()
 
-set_source_files_properties(
+# setup my vim ycm :D
-  toxcore/mono_time.c
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-  toxcore/network.c
-  toxcore/tox.c
-  toxcore/util.c
-  PROPERTIES SKIP_UNITY_BUILD_INCLUSION TRUE)
 
-################################################################################
+# more paths
-#
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
-# :: Version management
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
-#
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
-################################################################################
 
-# This version is for the entire project. All libraries (core, av, ...) move in
+# external libs
-# versions in a synchronised way.
+add_subdirectory(./external) # before increasing warn levels, sad :(
-set(PROJECT_VERSION_MAJOR "0")
-set(PROJECT_VERSION_MINOR "2")
-set(PROJECT_VERSION_PATCH "19")
-set(PROJECT_VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")
 
-# set .so library version / following libtool scheme
-# https://www.gnu.org/software/libtool/manual/libtool.html#Updating-version-info
-file(STRINGS ${toxcore_SOURCE_DIR}/so.version SOVERSION_CURRENT REGEX "^CURRENT=[0-9]+$")
-string(SUBSTRING "${SOVERSION_CURRENT}" 8 -1 SOVERSION_CURRENT)
-file(STRINGS ${toxcore_SOURCE_DIR}/so.version SOVERSION_REVISION REGEX "^REVISION=[0-9]+$")
-string(SUBSTRING "${SOVERSION_REVISION}" 9 -1 SOVERSION_REVISION)
-file(STRINGS ${toxcore_SOURCE_DIR}/so.version SOVERSION_AGE REGEX "^AGE=[0-9]+$")
-string(SUBSTRING "${SOVERSION_AGE}" 4 -1 SOVERSION_AGE)
-# account for some libtool magic, see other/version-sync script for details
-math(EXPR SOVERSION_MAJOR ${SOVERSION_CURRENT}-${SOVERSION_AGE})
-set(SOVERSION "${SOVERSION_MAJOR}.${SOVERSION_AGE}.${SOVERSION_REVISION}")
-message("SOVERSION: ${SOVERSION}")
-
-################################################################################
-#
-# :: Dependencies and configuration
-#
-################################################################################
-
-include(CTest)
-include(ModulePackage)
-include(StrictAbi)
-include(GNUInstallDirs)
-
-if(APPLE)
-  include(MacRpath)
-endif()
-
-enable_testing()
-find_package(GTest)
-
-set(CMAKE_MACOSX_RPATH ON)
-
-# Set standard version for compiler.
-if(MSVC AND MSVC_TOOLSET_VERSION LESS 143)
-  # https://developercommunity.visualstudio.com/t/older-winsdk-headers-are-incompatible-with-zcprepr/1593479
-  set(CMAKE_C_STANDARD 99)
-else()
-  set(CMAKE_C_STANDARD 11)
-endif()
-set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_C_EXTENSIONS OFF)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-message(STATUS "Supported C compiler features = ${CMAKE_C_COMPILE_FEATURES}")
+# bump up warning levels appropriately for clang, gcc & msvc
-message(STATUS "Supported C++ compiler features = ${CMAKE_CXX_COMPILE_FEATURES}")
+if (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
+	add_compile_options(
+		-Wall -Wextra # Reasonable and standard
+		-Wpedantic # Warn if non-standard C++ is used
+		-Wunused # Warn on anything being unused
+		#-Wconversion # Warn on type conversions that may lose data
+		#-Wsign-conversion # Warn on sign conversions
+		-Wshadow # Warn if a variable declaration shadows one from a parent context
+	)
 
-# Enable some warnings if we know the compiler.
+	if (NOT WIN32)
-if(MSVC)
+		#link_libraries(-fsanitize=address,undefined)
-  add_compile_options(/W4 /analyze)
+		#link_libraries(-fsanitize=undefined)
-  add_compile_options(/wd4100)  # unreferenced formal parameter
+	endif()
-  add_compile_options(/wd4267)  # narrowing conversion
+elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "MSVC")
-  add_compile_options(/wd4244)  # narrowing conversion
+	if (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
-  add_compile_options(/wd4127)  # conditional expression is constant
+		string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-  add_compile_options(/wd4995)  # #pragma deprecated
-  add_compile_options(/wd4018)  # signed/unsigned compare
-  add_compile_options(/wd4310)  # cast truncates constant value
-  add_compile_options(/wd4389)  # signed/unsigned compare
-  add_compile_options(/wd4245)  # signed/unsigned assign/return/function call
-  add_compile_options(/wd4200)  # nonstandard extension used: zero-sized array in struct/union
-  add_compile_options(/wd4702)  # unreachable code
-  add_compile_options(/wd6340)  # unsigned int passed to signed parameter
-  add_compile_options(/wd6326)  # potential comparison of a constant with another constant
-
-  # TODO(iphydf): Look into these
-  add_compile_options(/wd4996)  # use WSAAddressToStringW() instead of WSAAddressToStringA()
-  add_compile_options(/wd6255)  # don't use alloca
-  add_compile_options(/wd6385)  # reading invalid data
-  add_compile_options(/wd6001)  # using uninitialized memory
-  add_compile_options(/wd6101)  # returning uninitialized memory
-  add_compile_options(/wd6386)  # buffer overrun
-  add_compile_options(/wd6011)  # NULL dereference
-  add_compile_options(/wd6031)  # sscanf return value ignored
-  add_compile_options(/wd6387)  # passing NULL to fwrite
-endif()
-
-set(MIN_LOGGER_LEVEL "" CACHE STRING "Logging level to use (TRACE, DEBUG, INFO, WARNING, ERROR)")
-if(MIN_LOGGER_LEVEL)
-  if(("${MIN_LOGGER_LEVEL}" STREQUAL "TRACE") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "DEBUG") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "INFO") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "WARNING") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "ERROR"))
-    add_definitions(-DMIN_LOGGER_LEVEL=LOGGER_LEVEL_${MIN_LOGGER_LEVEL})
 	else()
-    message(FATAL_ERROR "Unknown value provided for MIN_LOGGER_LEVEL: \"${MIN_LOGGER_LEVEL}\", must be one of TRACE, DEBUG, INFO, WARNING or ERROR")
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
 	endif()
 endif()
 
-option(EXPERIMENTAL_API "Install experimental header file with unstable API" OFF)
+# cmake setup end
 
-option(USE_IPV6 "Use IPv6 in tests" ON)
+add_subdirectory(./src)
-if(NOT USE_IPV6)
-  add_definitions(-DUSE_IPV6=0)
-endif()
 
-option(BUILD_MISC_TESTS "Build additional tests" OFF)
-option(BUILD_FUN_UTILS "Build additional just for fun utilities" OFF)
-
-option(UNITTEST "Enable unit tests (disable if you don't have a working gmock or gtest)" ON)
-
-option(AUTOTEST "Enable autotests (mainly for CI)" OFF)
-if(AUTOTEST)
-  option(NON_HERMETIC_TESTS "Whether to build and run tests that depend on an internet connection" OFF)
-  option(PROXY_TEST "Enable proxy test (requires other/proxy/proxy_server.go to be running)" OFF)
-endif()
-
-option(BUILD_TOXAV "Whether to build the tox AV library" ON)
-option(MUST_BUILD_TOXAV "Fail the build if toxav cannot be built" OFF)
-
-option(DHT_BOOTSTRAP "Enable building of DHT_bootstrap" ON)
-option(BOOTSTRAP_DAEMON "Enable building of tox-bootstrapd" ON)
-if(BOOTSTRAP_DAEMON AND WIN32)
-  message(WARNING "Building tox-bootstrapd for Windows is not supported, disabling")
-  set(BOOTSTRAP_DAEMON OFF)
-endif()
-
-option(BUILD_FUZZ_TESTS "Build fuzzing harnesses" OFF)
-
-if(MSVC)
-  option(MSVC_STATIC_SODIUM "Whether to link libsodium statically for MSVC" OFF)
-  if(MSVC_STATIC_SODIUM)
-    add_definitions(-DSODIUM_STATIC=1)
-  endif()
-endif()
-
-include(Dependencies)
-
-if(MUST_BUILD_TOXAV)
-  set(NO_TOXAV_ERROR_TYPE SEND_ERROR)
-else()
-  set(NO_TOXAV_ERROR_TYPE WARNING)
-endif()
-
-if(BUILD_TOXAV)
-  if(NOT OPUS_FOUND)
-    message(${NO_TOXAV_ERROR_TYPE} "Option BUILD_TOXAV is enabled but required library OPUS was not found.")
-    set(BUILD_TOXAV OFF)
-  endif()
-  if(NOT VPX_FOUND)
-    message(${NO_TOXAV_ERROR_TYPE} "Option BUILD_TOXAV is enabled but required library VPX was not found.")
-    set(BUILD_TOXAV OFF)
-  endif()
-endif()
-
-# Disable float/double packing in CMP (C MessagePack library).
-# We don't transfer floats over the network, so we disable this functionality.
-add_definitions(-DCMP_NO_FLOAT=1)
-
-################################################################################
-#
-# :: Tox Core Library
-#
-################################################################################
-
-# toxcore_PKGCONFIG_LIBS is what's added to the Libs: line in toxcore.pc. It
-# needs to contain all the libraries a program using toxcore should link against
-# if it's statically linked. If it's dynamically linked, there is no need to
-# explicitly link against all the dependencies, but it doesn't harm much(*)
-# either.
-#
-# (*) It allows client code to use symbols from our dependencies without
-#    explicitly linking against them.
-set(toxcore_PKGCONFIG_LIBS)
-# Requires: in pkg-config file.
-set(toxcore_PKGCONFIG_REQUIRES)
-
-set(toxcore_SOURCES
-  third_party/cmp/cmp.c
-  third_party/cmp/cmp.h
-  toxcore/announce.c
-  toxcore/announce.h
-  toxcore/bin_pack.c
-  toxcore/bin_pack.h
-  toxcore/bin_unpack.c
-  toxcore/bin_unpack.h
-  toxcore/ccompat.c
-  toxcore/ccompat.h
-  toxcore/crypto_core.c
-  toxcore/crypto_core.h
-  toxcore/crypto_core_pack.c
-  toxcore/crypto_core_pack.h
-  toxcore/DHT.c
-  toxcore/DHT.h
-  toxcore/events/conference_connected.c
-  toxcore/events/conference_invite.c
-  toxcore/events/conference_message.c
-  toxcore/events/conference_peer_list_changed.c
-  toxcore/events/conference_peer_name.c
-  toxcore/events/conference_title.c
-  toxcore/events/dht_get_nodes_response.c
-  toxcore/events/events_alloc.c
-  toxcore/events/events_alloc.h
-  toxcore/events/file_chunk_request.c
-  toxcore/events/file_recv.c
-  toxcore/events/file_recv_chunk.c
-  toxcore/events/file_recv_control.c
-  toxcore/events/friend_connection_status.c
-  toxcore/events/friend_lossless_packet.c
-  toxcore/events/friend_lossy_packet.c
-  toxcore/events/friend_message.c
-  toxcore/events/friend_name.c
-  toxcore/events/friend_read_receipt.c
-  toxcore/events/friend_request.c
-  toxcore/events/friend_status.c
-  toxcore/events/friend_status_message.c
-  toxcore/events/friend_typing.c
-  toxcore/events/self_connection_status.c
-  toxcore/events/group_custom_packet.c
-  toxcore/events/group_custom_private_packet.c
-  toxcore/events/group_invite.c
-  toxcore/events/group_join_fail.c
-  toxcore/events/group_message.c
-  toxcore/events/group_moderation.c
-  toxcore/events/group_password.c
-  toxcore/events/group_peer_exit.c
-  toxcore/events/group_peer_join.c
-  toxcore/events/group_peer_limit.c
-  toxcore/events/group_peer_name.c
-  toxcore/events/group_peer_status.c
-  toxcore/events/group_privacy_state.c
-  toxcore/events/group_private_message.c
-  toxcore/events/group_self_join.c
-  toxcore/events/group_topic.c
-  toxcore/events/group_topic_lock.c
-  toxcore/events/group_voice_state.c
-  toxcore/forwarding.c
-  toxcore/forwarding.h
-  toxcore/friend_connection.c
-  toxcore/friend_connection.h
-  toxcore/friend_requests.c
-  toxcore/friend_requests.h
-  toxcore/group.c
-  toxcore/group_chats.c
-  toxcore/group_chats.h
-  toxcore/group_common.h
-  toxcore/group_connection.c
-  toxcore/group_connection.h
-  toxcore/group.h
-  toxcore/group_announce.c
-  toxcore/group_announce.h
-  toxcore/group_moderation.c
-  toxcore/group_moderation.h
-  toxcore/group_onion_announce.c
-  toxcore/group_onion_announce.h
-  toxcore/group_pack.c
-  toxcore/group_pack.h
-  toxcore/LAN_discovery.c
-  toxcore/LAN_discovery.h
-  toxcore/list.c
-  toxcore/list.h
-  toxcore/logger.c
-  toxcore/logger.h
-  toxcore/Messenger.c
-  toxcore/Messenger.h
-  toxcore/mem.c
-  toxcore/mem.h
-  toxcore/mono_time.c
-  toxcore/mono_time.h
-  toxcore/net_crypto.c
-  toxcore/net_crypto.h
-  toxcore/network.c
-  toxcore/network.h
-  toxcore/onion_announce.c
-  toxcore/onion_announce.h
-  toxcore/onion.c
-  toxcore/onion_client.c
-  toxcore/onion_client.h
-  toxcore/onion.h
-  toxcore/ping_array.c
-  toxcore/ping_array.h
-  toxcore/ping.c
-  toxcore/ping.h
-  toxcore/shared_key_cache.c
-  toxcore/shared_key_cache.h
-  toxcore/state.c
-  toxcore/state.h
-  toxcore/TCP_client.c
-  toxcore/TCP_client.h
-  toxcore/TCP_common.c
-  toxcore/TCP_common.h
-  toxcore/TCP_connection.c
-  toxcore/TCP_connection.h
-  toxcore/TCP_server.c
-  toxcore/TCP_server.h
-  toxcore/timed_auth.c
-  toxcore/timed_auth.h
-  toxcore/tox_api.c
-  toxcore/tox.c
-  toxcore/tox_dispatch.c
-  toxcore/tox_dispatch.h
-  toxcore/tox_event.c
-  toxcore/tox_event.h
-  toxcore/tox_events.c
-  toxcore/tox_events.h
-  toxcore/tox.h
-  toxcore/tox_private.c
-  toxcore/tox_private.h
-  toxcore/tox_pack.c
-  toxcore/tox_pack.h
-  toxcore/tox_unpack.c
-  toxcore/tox_unpack.h
-  toxcore/util.c
-  toxcore/util.h)
-if(TARGET unofficial-sodium::sodium)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} unofficial-sodium::sodium)
-else()
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${LIBSODIUM_LIBRARIES})
-  set(toxcore_LINK_DIRECTORIES ${toxcore_LINK_DIRECTORIES} ${LIBSODIUM_LIBRARY_DIRS})
-  set(toxcore_INCLUDE_DIRECTORIES ${toxcore_INCLUDE_DIRECTORIES} ${LIBSODIUM_INCLUDE_DIRS})
-  set(toxcore_COMPILE_OPTIONS ${toxcore_COMPILE_OPTIONS} ${LIBSODIUM_CFLAGS_OTHER})
-endif()
-set(toxcore_PKGCONFIG_REQUIRES ${toxcore_PKGCONFIG_REQUIRES} libsodium)
-set(toxcore_API_HEADERS
-  ${toxcore_SOURCE_DIR}/toxcore/tox.h^tox
-  ${toxcore_SOURCE_DIR}/toxcore/tox_events.h^tox
-  ${toxcore_SOURCE_DIR}/toxcore/tox_dispatch.h^tox)
-if(EXPERIMENTAL_API)
-  set(toxcore_API_HEADERS ${toxcore_API_HEADERS}
-    ${toxcore_SOURCE_DIR}/toxcore/tox_private.h^tox)
-endif()
-
-################################################################################
-#
-# :: Audio/Video Library
-#
-################################################################################
-
-if(BUILD_TOXAV)
-  set(toxcore_SOURCES ${toxcore_SOURCES}
-    toxav/audio.c
-    toxav/audio.h
-    toxav/bwcontroller.c
-    toxav/bwcontroller.h
-    toxav/groupav.c
-    toxav/groupav.h
-    toxav/msi.c
-    toxav/msi.h
-    toxav/ring_buffer.c
-    toxav/ring_buffer.h
-    toxav/rtp.c
-    toxav/rtp.h
-    toxav/toxav.c
-    toxav/toxav.h
-    toxav/toxav_old.c
-    toxav/video.c
-    toxav/video.h)
-  set(toxcore_API_HEADERS ${toxcore_API_HEADERS}
-    ${toxcore_SOURCE_DIR}/toxav/toxav.h^toxav)
-
-  if(MSVC)
-    set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} PkgConfig::OPUS PkgConfig::VPX)
-  else()
-    set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${OPUS_LIBRARIES} ${VPX_LIBRARIES})
-    set(toxcore_LINK_DIRECTORIES ${toxcore_LINK_DIRECTORIES} ${OPUS_LIBRARY_DIRS} ${VPX_LIBRARY_DIRS})
-    set(toxcore_INCLUDE_DIRECTORIES ${toxcore_INCLUDE_DIRECTORIES} ${OPUS_INCLUDE_DIRS} ${VPX_INCLUDE_DIRS})
-    set(toxcore_COMPILE_OPTIONS ${toxcore_COMPILE_OPTIONS} ${OPUS_CFLAGS_OTHER} ${VPX_CFLAGS_OTHER})
-  endif()
-  set(toxcore_PKGCONFIG_REQUIRES ${toxcore_PKGCONFIG_REQUIRES} opus vpx)
-endif()
-
-################################################################################
-#
-# :: Block encryption libraries
-#
-################################################################################
-
-set(toxcore_SOURCES ${toxcore_SOURCES}
-  toxencryptsave/toxencryptsave.c
-  toxencryptsave/toxencryptsave.h)
-set(toxcore_API_HEADERS ${toxcore_API_HEADERS}
-  ${toxcore_SOURCE_DIR}/toxencryptsave/toxencryptsave.h^tox)
-
-################################################################################
-#
-# :: System dependencies
-#
-################################################################################
-
-# These need to come after other dependencies, since e.g. libvpx may depend on
-# pthread, but doesn't list it in VPX_LIBRARIES. We're adding it here, after
-# any potential libvpx linking.
-message("CMAKE_THREAD_LIBS_INIT: ${CMAKE_THREAD_LIBS_INIT}")
-if(CMAKE_THREAD_LIBS_INIT)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} ${CMAKE_THREAD_LIBS_INIT})
-endif()
-
-if(NSL_LIBRARIES)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${NSL_LIBRARIES})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} -lnsl)
-endif()
-
-if(RT_LIBRARIES)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${RT_LIBRARIES})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} -lrt)
-endif()
-
-if(SOCKET_LIBRARIES)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${SOCKET_LIBRARIES})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} -lsocket)
-endif()
-
-if(TARGET PThreads4W::PThreads4W)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} PThreads4W::PThreads4W)
-elseif(TARGET Threads::Threads)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} Threads::Threads)
-endif()
-if(WIN32)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} iphlpapi ws2_32)
-endif()
-
-################################################################################
-#
-# :: All layers together in one library for ease of use
-#
-################################################################################
-
-# Create combined library from all the sources.
-if(ENABLE_SHARED)
-  add_library(toxcore_shared SHARED ${toxcore_SOURCES})
-  set_target_properties(toxcore_shared PROPERTIES OUTPUT_NAME toxcore)
-  target_link_libraries(toxcore_shared PRIVATE ${toxcore_LINK_LIBRARIES})
-  target_link_directories(toxcore_shared PUBLIC ${toxcore_LINK_DIRECTORIES})
-  target_include_directories(toxcore_shared SYSTEM PRIVATE ${toxcore_INCLUDE_DIRECTORIES})
-  target_compile_options(toxcore_shared PRIVATE ${toxcore_COMPILE_OPTIONS})
-endif()
-
-if(ENABLE_STATIC)
-  add_library(toxcore_static STATIC ${toxcore_SOURCES})
-  if(NOT MSVC)
-    set_target_properties(toxcore_static PROPERTIES OUTPUT_NAME toxcore)
-  endif()
-  target_link_libraries(toxcore_static PRIVATE ${toxcore_LINK_LIBRARIES})
-  target_link_directories(toxcore_static PUBLIC ${toxcore_LINK_DIRECTORIES})
-  target_include_directories(toxcore_static SYSTEM PRIVATE ${toxcore_INCLUDE_DIRECTORIES})
-  target_compile_options(toxcore_static PRIVATE ${toxcore_COMPILE_OPTIONS})
-endif()
-
-if(BUILD_FUZZ_TESTS)
-  add_library(toxcore_fuzz STATIC ${toxcore_SOURCES})
-  target_link_libraries(toxcore_fuzz PRIVATE ${toxcore_LINK_LIBRARIES})
-  target_link_directories(toxcore_fuzz PUBLIC ${toxcore_LINK_DIRECTORIES})
-  target_include_directories(toxcore_fuzz SYSTEM PRIVATE ${toxcore_INCLUDE_DIRECTORIES})
-  target_compile_options(toxcore_fuzz PRIVATE ${toxcore_COMPILE_OPTIONS})
-  target_compile_definitions(toxcore_fuzz PUBLIC "FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION")
-endif()
-
-# Make version script (on systems that support it) to limit symbol visibility.
-make_version_script(toxcore ${toxcore_API_HEADERS})
-
-# Generate pkg-config file, install library to "${CMAKE_INSTALL_LIBDIR}" and install headers to
-# "${CMAKE_INSTALL_INCLUDEDIR}/tox".
-install_module(toxcore DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/tox)
-
-################################################################################
-#
-# :: Unit tests: no networking, just pure function calls.
-#
-################################################################################
-
-add_library(test_util STATIC
-  toxcore/DHT_test_util.cc
-  toxcore/DHT_test_util.hh
-  toxcore/crypto_core_test_util.cc
-  toxcore/crypto_core_test_util.hh
-  toxcore/mem_test_util.cc
-  toxcore/mem_test_util.hh
-  toxcore/network_test_util.cc
-  toxcore/network_test_util.hh
-  toxcore/test_util.cc
-  toxcore/test_util.hh)
-
-function(unit_test subdir target)
-  add_executable(unit_${target}_test ${subdir}/${target}_test.cc)
-  target_link_libraries(unit_${target}_test PRIVATE test_util)
-  if(TARGET toxcore_static)
-    target_link_libraries(unit_${target}_test PRIVATE toxcore_static)
-  else()
-    target_link_libraries(unit_${target}_test PRIVATE toxcore_shared)
-  endif()
-  target_link_libraries(unit_${target}_test PRIVATE GTest::gtest GTest::gtest_main GTest::gmock)
-  set_target_properties(unit_${target}_test PROPERTIES COMPILE_FLAGS "${TEST_CXX_FLAGS}")
-  add_test(NAME ${target} COMMAND ${CROSSCOMPILING_EMULATOR} unit_${target}_test)
-  set_property(TEST ${target} PROPERTY ENVIRONMENT "LLVM_PROFILE_FILE=${target}.profraw")
-endfunction()
-
-# The actual unit tests follow.
-#
-if(UNITTEST AND TARGET GTest::gtest AND TARGET GTest::gmock)
-  unit_test(toxav ring_buffer)
-  unit_test(toxav rtp)
-  unit_test(toxcore DHT)
-  unit_test(toxcore bin_pack)
-  unit_test(toxcore crypto_core)
-  unit_test(toxcore group_announce)
-  unit_test(toxcore group_moderation)
-  unit_test(toxcore list)
-  unit_test(toxcore mem)
-  unit_test(toxcore mono_time)
-  unit_test(toxcore ping_array)
-  unit_test(toxcore test_util)
-  unit_test(toxcore tox)
-  unit_test(toxcore util)
-endif()
-
-add_subdirectory(testing)
-
-################################################################################
-#
-# :: Automated regression tests: create a tox network and run integration tests
-#
-################################################################################
-
-if(AUTOTEST)
-  add_subdirectory(auto_tests)
-endif()
-
-################################################################################
-#
-# :: Bootstrap daemon
-#
-################################################################################
-
-if(DHT_BOOTSTRAP)
-  add_executable(DHT_bootstrap
-    other/DHT_bootstrap.c
-    other/bootstrap_node_packets.c)
-  if(TARGET toxcore_static)
-    target_link_libraries(DHT_bootstrap PRIVATE toxcore_static)
-  else()
-    target_link_libraries(DHT_bootstrap PRIVATE toxcore_shared)
-  endif()
-  target_link_libraries(DHT_bootstrap PRIVATE misc_tools)
-  if(TARGET unofficial-sodium::sodium)
-    target_link_libraries(DHT_bootstrap PRIVATE unofficial-sodium::sodium)
-  endif()
-  if(TARGET PThreads4W::PThreads4W)
-    target_link_libraries(DHT_bootstrap PRIVATE PThreads4W::PThreads4W)
-  elseif(TARGET Threads::Threads)
-    target_link_libraries(DHT_bootstrap PRIVATE Threads::Threads)
-  endif()
-  install(TARGETS DHT_bootstrap RUNTIME DESTINATION bin)
-endif()
-
-if(BOOTSTRAP_DAEMON)
-  if(LIBCONFIG_FOUND)
-    add_subdirectory(other/bootstrap_daemon)
-  else()
-    message(WARNING "Option BOOTSTRAP_DAEMON is enabled but required library LIBCONFIG was not found.")
-    set(BOOTSTRAP_DAEMON OFF)
-  endif()
-endif()
-
-if(BUILD_FUN_UTILS)
-  add_subdirectory(other/fun)
-endif()
-
-if (BUILD_FUZZ_TESTS)
-  add_subdirectory(testing/fuzzing)
-endif()

CMakePresets.json

@@ -1,21 +0,0 @@
-{
-    "version": 3,
-    "configurePresets": [
-        {
-            "name": "windows-default",
-            "binaryDir": "${sourceDir}/_build",
-            "cacheVariables": {
-                "ENABLE_SHARED": true,
-                "ENABLE_STATIC": true,
-                "AUTOTEST": true,
-                "BUILD_MISC_TESTS": true,
-                "BOOTSTRAP_DAEMON": false,
-                "MUST_BUILD_TOXAV": true,
-                "TEST_TIMEOUT_SECONDS": "60",
-                "CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS": true,
-                "CMAKE_COMPILE_WARNING_AS_ERROR": true,
-                "CMAKE_TOOLCHAIN_FILE": "$env{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
-            }
-        }
-    ]
-}

INSTALL.md

@@ -1,455 +0,0 @@
-# Installation instructions
-
-These instructions will guide you through the process of building and installing
-the toxcore library and its components, as well as getting already pre-built
-binaries.
-
-## Table of contents
-
-- [Overview](#overview)
-  - [Components](#components)
-    - [Main](#main)
-    - [Secondary](#secondary)
-- [Building](#building)
-  - [Requirements](#requirements)
-    - [Library dependencies](#library-dependencies)
-    - [Compiler requirements](#compiler-requirements)
-    - [Build system requirements](#build-system-requirements)
-  - [CMake options](#cmake-options)
-  - [Build process](#build-process)
-    - [Unix-like](#unix-like)
-    - [Windows](#windows)
-      - [Building on Windows host](#building-on-windows-host)
-        - [Microsoft Visual Studio's Developer Command Prompt](#microsoft-visual-studios-developer-command-prompt)
-        - [MSYS/Cygwin](#msyscygwin)
-      - [Cross-compiling from Linux](#cross-compiling-from-linux)
-- [Pre-built binaries](#pre-built-binaries)
-  - [Linux](#linux)
-
-## Overview
-
-### Components
-
-#### Main
-
-This repository, although called `toxcore`, in fact contains several libraries
-besides `toxcore` which complement it, as well as several executables. However,
-note that although these are separate libraries, at the moment, when building
-the libraries, they are all merged into a single `toxcore` library. Here is the
-full list of the main components that can be built using the CMake, their
-dependencies and descriptions.
-
-| Name             | Type       | Dependencies                       | Platform       | Description                                                                                                                |
-| ---------------- | ---------- | ---------------------------------- | -------------- | -------------------------------------------------------------------------------------------------------------------------- |
-| `toxcore`        | Library    | libsodium, libm, libpthread, librt | Cross-platform | The main Tox library that provides the messenger functionality.                                                            |
-| `toxav`          | Library    | libtoxcore, libopus, libvpx        | Cross-platform | Provides audio/video functionality.                                                                                        |
-| `toxencryptsave` | Library    | libtoxcore, libsodium              | Cross-platform | Provides encryption of Tox profiles (savedata), as well as arbitrary data.                                                 |
-| `DHT_bootstrap`  | Executable | libtoxcore                         | Cross-platform | A simple DHT bootstrap node.                                                                                               |
-| `tox-bootstrapd` | Executable | libtoxcore, libconfig              | Unix-like      | Highly configurable DHT bootstrap node daemon (systemd, SysVinit, Docker).                                                 |
-| `cmp`            | Library    |                                    | Cross-platform | C implementation of the MessagePack serialization format. [https://github.com/camgunz/cmp](https://github.com/camgunz/cmp) |
-
-#### Secondary
-
-There are some programs that are not built by default which you might find
-interesting. You need to pass `-DBUILD_FUN_UTILS=ON` to cmake to build them.
-
-##### Vanity key generators
-
-Can be used to generate vanity Tox Ids or DHT bootstrap node public keys.
-
-| Name             | Type       | Dependencies      | Platform       | Description                                                                                                                                                                   |
-| ---------------- | ---------- | ----------------- | -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `cracker`        | Executable | libsodium, OpenMP | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which starts with a specified byte sequence. Multi-threaded.                                     |
-| `cracker_simple` | Executable | libsodium         | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which starts with a specified byte sequence. Single-threaded.                                    |
-| `strkey`         | Executable | libsodium         | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which contains a specified byte sequence at a specified or any position at all. Single-threaded. |
-
-##### Key file generators
-
-Useful for generating Tox profiles from the output of the vanity key generators,
-as well as generating random Tox profiles.
-
-| Name                      | Type       | Dependencies          | Platform       | Description                                                                                                                                                                     |
-| ------------------------- | ---------- | --------------------- | -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `make-funny-savefile`     | Script     | python                | Cross-platform | Generates a Tox profile file (savedata file) with the provided key pair.                                                                                                        |
-| `create_bootstrap_keys`   | Executable | libsodium             | Cross-platform | Generates a keys file for tox-bootstrapd with either the provided or a random key pair.                                                                                         |
-| `create_minimal_savedata` | Executable | libsodium             | Cross-platform | Generates a minimal Tox profile file (savedata file) with either the provided or a random key pair, printing the generated Tox Id and secret & public key information.          |
-| `create_savedata`         | Executable | libsodium, libtoxcore | Cross-platform | Generates a Tox profile file (savedata file) with either the provided or a random key pair using libtoxcore, printing the generated Tox Id and secret & public key information. |
-| `save-generator`          | Executable | libtoxcore            | Cross-platform | Generates a Tox profile file (savedata file) with a random key pair using libtoxcore, setting the specified user name, going online and adding specified Tox Ids as friends.    |
-
-##### Other
-
-| Name                  | Type       | Dependencies | Platform       | Description                                                                                                                               |
-| --------------------- | ---------- | ------------ | -------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
-| `bootstrap_node_info` | Script     | python3      | Cross-platform | Prints version and Message Of The Day (MOTD) information of the specified DHT bootstrap node, given the node doesn't have those disabled. |
-| `sign`                | Executable | libsodium    | Cross-platform | Signs a file with a ed25519 key.                                                                                                          |
-
-## Building
-
-### Requirements
-
-#### Library dependencies
-
-Library dependencies are listed in the [components](#components) table. The
-dependencies need to be satisfied for the components to be built. Note that if
-you don't have a dependency for some component, e.g. you don't have `libopus`
-installed required for building `toxav` component, building of that component is
-silently disabled.
-
-Be advised that due to the addition of `cmp` as a submodule, you now also need
-to initialize the git submodules required by toxcore. This can be done by
-cloning the repo with the addition of `--recurse-submodules` or by running
-`git submodule update --init` in the root directory of the repo.
-
-#### Compiler requirements
-
-The supported compilers are GCC, Clang and MinGW.
-
-In theory, any compiler that fully supports C99 and accepts GCC flags should
-work.
-
-There is a partial and experimental support of Microsoft Visual C++ compiler. We
-welcome any patches that help improve it.
-
-You should have a C99 compatible compiler in order to build the main components.
-The secondary components might require the compiler to support GNU extensions.
-
-#### Build system requirements
-
-To build the main components you need to have CMake of at least 2.8.6 version
-installed. You also need to have pkg-config installed, the build system uses it
-to find dependency libraries.
-
-There is some experimental accommodation for building natively on Windows, i.e.
-without having to use MSYS/Cygwin and pkg-config, but it uses exact hardcoded
-paths for finding libraries and supports building only of some of toxcore
-components, so your mileage might vary.
-
-### CMake options
-
-There are some options that are available to configure the build.
-
-| Name                    | Description                                                                                   | Expected Value                                                            | Default Value                                     |
-| ----------------------- | --------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------- | ------------------------------------------------- |
-| `AUTOTEST`              | Enable autotests (mainly for CI).                                                             | ON or OFF                                                                 | OFF                                               |
-| `BOOTSTRAP_DAEMON`      | Enable building of tox-bootstrapd, the DHT bootstrap node daemon. For Unix-like systems only. | ON or OFF                                                                 | ON                                                |
-| `BUILD_FUN_UTILS`       | Build additional just for fun utilities.                                                      | ON or OFF                                                                 | OFF                                               |
-| `BUILD_FUZZ_TESTS`      | Build fuzzing harnesses.                                                                      | ON or OFF                                                                 | OFF                                               |
-| `BUILD_MISC_TESTS`      | Build additional tests.                                                                       | ON or OFF                                                                 | OFF                                               |
-| `BUILD_TOXAV`           | Whether to build the toxav library.                                                           | ON or OFF                                                                 | ON                                                |
-| `CMAKE_BUILD_TYPE`      | Specifies the build type on single-configuration generators (e.g. make or ninja).             | Debug, Release, RelWithDebInfo, MinSizeRel                                | Empty string.                                     |
-| `CMAKE_INSTALL_PREFIX`  | Path to where everything should be installed.                                                 | Directory path.                                                           | Platform-dependent. Refer to CMake documentation. |
-| `DHT_BOOTSTRAP`         | Enable building of `DHT_bootstrap`.                                                           | ON or OFF                                                                 | ON                                                |
-| `ENABLE_SHARED`         | Build shared (dynamic) libraries for all modules.                                             | ON or OFF                                                                 | ON                                                |
-| `ENABLE_STATIC`         | Build static libraries for all modules.                                                       | ON or OFF                                                                 | ON                                                |
-| `EXPERIMENTAL_API`      | Install experimental header file with unstable API.                                           | ON or OFF                                                                 | OFF                                               |
-| `FLAT_OUTPUT_STRUCTURE` | Whether to produce output artifacts in {bin,lib}.                                             | ON or OFF                                                                 | OFF                                               |
-| `FULLY_STATIC`          | Build fully static executables.                                                               | ON or OFF                                                                 | OFF                                               |
-| `MIN_LOGGER_LEVEL`      | Logging level to use.                                                                         | TRACE, DEBUG, INFO, WARNING, ERROR or nothing (empty string) for default. | Empty string.                                     |
-| `MSVC_STATIC_SODIUM`    | Whether to link libsodium statically for MSVC.                                                | ON or OFF                                                                 | OFF                                               |
-| `MUST_BUILD_TOXAV`      | Fail the build if toxav cannot be built.                                                      | ON or OFF                                                                 | OFF                                               |
-| `NON_HERMETIC_TESTS`    | Whether to build and run tests that depend on an internet connection.                         | ON or OFF                                                                 | OFF                                               |
-| `PROXY_TEST`            | Enable proxy test (requires `other/proxy/proxy_server.go` to be running).                     | ON or OFF                                                                 | OFF                                               |
-| `STRICT_ABI`            | Enforce strict ABI export in dynamic libraries.                                               | ON or OFF                                                                 | OFF                                               |
-| `TEST_TIMEOUT_SECONDS`  | Limit runtime of each test to the number of seconds specified.                                | Positive number or nothing (empty string).                                | Empty string.                                     |
-| `UNITTEST`              | Enable unit tests (disable if you don't have a working gmock or gtest).                       | ON or OFF                                                                 | ON                                                |
-| `USE_IPV6`              | Use IPv6 in tests.                                                                            | ON or OFF                                                                 | ON                                                |
-
-You can get this list of option using the following commands
-
-```sh
-cmake -B _build -LAH
-```
-
-or
-
-```sh
-grep "option(" CMakeLists.txt cmake/*
-grep "set(.* CACHE" CMakeLists.txt cmake/*
-```
-
-Note that some options might be considered only if other options are enabled.
-
-Example of calling cmake with options
-
-```sh
-cmake \
-  -D ENABLE_STATIC=OFF \
-  -D ENABLE_SHARED=ON \
-  -D CMAKE_INSTALL_PREFIX="${PWD}/prefix" \
-  -D CMAKE_BUILD_TYPE=Release \
-  -D TEST_TIMEOUT_SECONDS=120 \
-  ..
-```
-
-### Building tests
-
-In addition to the integration tests ("autotests") and miscellaneous tests
-enabled by cmake variables described above, there are unit tests which will be
-built if the source distribution of gtest (the Google Unit Test framework) is
-found by cmake in `c-toxcore/third_party`. This can be achieved by running 'git
-clone https://github.com/google/googletest` from that directory.
-
-### Build process
-
-#### Unix-like
-
-Assuming all the [requirements](#requirements) are met, just run
-
-```sh
-mkdir _build
-cd _build
-cmake ..
-make
-make install
-```
-
-or shorter
-
-```sh
-cmake -B _build
-cmake -B _build --target install
-```
-
-#### Windows
-
-##### Building on Windows host
-
-###### Microsoft Visual Studio's Developer Command Prompt
-
-In addition to meeting the [requirements](#requirements), you need a version of
-Visual Studio (the
-[community edition](https://www.visualstudio.com/vs/visual-studio-express/) is
-enough) and a CMake version that's compatible with the Visual Studio version
-you're using.
-
-You must also ensure that the msvc versions of dependencies you're using are
-placed in the correct folders.
-
-For libsodium that is `c-toxcore/third_party/libsodium`, and for pthreads-w32,
-it's `c-toxcore/third_party/pthreads-win32`
-
-Once all of this is done, from the **Developer Command Prompt for VS**, simply
-run
-
-```
-mkdir _build
-cd _build
-cmake ..
-msbuild ALL_BUILD.vcxproj
-```
-
-###### MSYS/Cygwin
-
-Download Cygwin
-([32-bit](https://cygwin.com/setup-x86.exe)/[64-bit](https://cygwin.com/setup-x86_64.exe))
-
-Search and select exactly these packages in Devel category:
-
-- mingw64-i686-gcc-core (32-bit) / mingw64-x86_64-gcc-core (64-bit)
-- mingw64-i686-gcc-g++ (32-bit) / mingw64-x86_64-gcc-g++ (64-bit)
-- make
-- cmake
-- libtool
-- autoconf
-- automake
-- tree
-- curl
-- perl
-- yasm
-- pkg-config
-
-To handle Windows EOL correctly run the following in the Cygwin Terminal:
-
-```sh
-echo '
-export SHELLOPTS
-set -o igncr
-' > ~/.bash_profile
-```
-
-Download toxcore source code and extract it to a folder.
-
-Open Cygwin Terminal in the toxcore folder and run
-`./other/windows_build_script_toxcore.sh` to start the build process.
-
-Toxcore build result files will appear in `/root/prefix/` relatively to Cygwin
-folder (default `C:\cygwin64`).
-
-Dependency versions can be customized in
-`./other/windows_build_script_toxcore.sh` and described in the section below.
-
-##### Cross-compiling from Linux
-
-These cross-compilation instructions were tested on and written for 64-bit
-Ubuntu 16.04. You could generalize them for any Linux system, the only
-requirements are that you have Docker version of >= 1.9.0 and you are running
-64-bit system.
-
-The cross-compilation is fully automated by a parameterized
-[Dockerfile](/other/docker/windows/Dockerfile).
-
-Install Docker
-
-```sh
-apt-get update
-apt-get install docker.io
-```
-
-Get the toxcore source code and navigate to `other/docker/windows`.
-
-Build the container image based on the Dockerfile. The following options are
-available to customize the building of the container image.
-
-| Name                       | Description                                           | Expected Value                      | Default Value |
-| -------------------------- | ----------------------------------------------------- | ----------------------------------- | ------------- |
-| `SUPPORT_ARCH_i686`        | Support building 32-bit toxcore.                      | "true" or "false" (case sensitive). | true          |
-| `SUPPORT_ARCH_x86_64`      | Support building 64-bit toxcore.                      | "true" or "false" (case sensitive). | true          |
-| `SUPPORT_TEST`             | Support running toxcore automated tests.              | "true" or "false" (case sensitive). | false         |
-| `VERSION_OPUS`             | Version of libopus to build toxcore with.             | Numeric version number.             | 1.4           |
-| `VERSION_SODIUM`           | Version of libsodium to build toxcore with.           | Numeric version number.             | 1.0.19        |
-| `VERSION_VPX`              | Version of libvpx to build toxcore with.              | Numeric version number.             | 1.14.0        |
-| `ENABLE_HASH_VERIFICATION` | Verify the hashes of the default dependency versions. | "true" or "false" (case sensitive). | true          |
-
-Example of building a container image with options
-
-```sh
-cd other/docker/windows
-docker build \
-  --build-arg SUPPORT_TEST=true \
-  -t toxcore \
-  .
-```
-
-Run the container to build toxcore. The following options are available to
-customize the running of the container image.
-
-| Name                 | Description                                                                                | Expected Value                      | Default Value                              |
-| -------------------- | ------------------------------------------------------------------------------------------ | ----------------------------------- | ------------------------------------------ |
-| `ALLOW_TEST_FAILURE` | Don't stop if a test suite fails.                                                          | "true" or "false" (case sensitive). | `false`                                    |
-| `ENABLE_ARCH_i686`   | Build 32-bit toxcore. The image should have been built with `SUPPORT_ARCH_i686` enabled.   | "true" or "false" (case sensitive). | `true`                                     |
-| `ENABLE_ARCH_x86_64` | Build 64-bit toxcore. The image should have been built with `SUPPORT_ARCH_x86_64` enabled. | "true" or "false" (case sensitive). | `true`                                     |
-| `ENABLE_TEST`        | Run the test suite. The image should have been built with `SUPPORT_TEST` enabled.          | "true" or "false" (case sensitive). | `false`                                    |
-| `EXTRA_CMAKE_FLAGS`  | Extra arguments to pass to the CMake command when building toxcore.                        | CMake options.                      | `-DTEST_TIMEOUT_SECONDS=90 -DUSE_IPV6=OFF` |
-
-Example of running the container with options
-
-```sh
-docker run \
-  -e ENABLE_TEST=true \
-  -e ALLOW_TEST_FAILURE=true \
-  -v /path/to/toxcore/sourcecode:/toxcore \
-  -v /path/to/where/output/build/result:/prefix \
-  -t \
-  --rm \
-  toxcore
-```
-
-After the build succeeds, you should see the built toxcore libraries in
-`/path/to/where/output/build/result`.
-
-The file structure should look similar to the following
-
-```
-result
-├── [4.0K]  i686
-│   ├── [ 36K]  bin
-│   │   ├── [636K]  DHT_bootstrap.exe
-│   │   ├── [572K]  cracker.exe
-│   │   ├── [359K]  cracker_simple.exe
-│   │   ├── [378K]  create_bootstrap_keys.exe
-│   │   ├── [378K]  create_minimal_savedata.exe
-│   │   ├── [958K]  create_savedata.exe
-│   │   ├── [ 18K]  libtoxcore.def
-│   │   ├── [2.6M]  libtoxcore.dll
-│   │   ├── [ 65K]  libtoxcore.exp
-│   │   ├── [428K]  libtoxcore.lib
-│   │   ├── [989K]  save-generator.exe
-│   │   ├── [381K]  sign.exe
-│   │   └── [408K]  strkey.exe
-│   ├── [4.0K]  include
-│   │   └── [4.0K]  tox
-│   │       ├── [177K]  tox.h
-│   │       ├── [ 10K]  tox_dispatch.h
-│   │       ├── [ 26K]  tox_events.h
-│   │       ├── [6.4K]  tox_private.h
-│   │       ├── [ 26K]  toxav.h
-│   │       └── [ 12K]  toxencryptsave.h
-│   └── [4.0K]  lib
-│       ├── [577K]  libopus.a
-│       ├── [660K]  libsodium.a
-│       ├── [ 10K]  libssp.a
-│       ├── [1016K]  libtoxcore.a
-│       ├── [456K]  libtoxcore.dll.a
-│       ├── [2.7M]  libvpx.a
-│       ├── [ 72K]  libwinpthread.a
-│       └── [4.0K]  pkgconfig
-│           ├── [ 250]  libsodium.pc
-│           ├── [ 357]  opus.pc
-│           ├── [ 247]  toxcore.pc
-│           └── [ 309]  vpx.pc
-└── [4.0K]  x86_64
-    ├── [ 36K]  bin
-    │   ├── [504K]  DHT_bootstrap.exe
-    │   ├── [474K]  cracker.exe
-    │   ├── [277K]  cracker_simple.exe
-    │   ├── [287K]  create_bootstrap_keys.exe
-    │   ├── [288K]  create_minimal_savedata.exe
-    │   ├── [769K]  create_savedata.exe
-    │   ├── [ 18K]  libtoxcore.def
-    │   ├── [2.4M]  libtoxcore.dll
-    │   ├── [ 64K]  libtoxcore.exp
-    │   ├── [420K]  libtoxcore.lib
-    │   ├── [800K]  save-generator.exe
-    │   ├── [289K]  sign.exe
-    │   └── [317K]  strkey.exe
-    ├── [4.0K]  include
-    │   └── [4.0K]  tox
-    │       ├── [177K]  tox.h
-    │       ├── [ 10K]  tox_dispatch.h
-    │       ├── [ 26K]  tox_events.h
-    │       ├── [6.4K]  tox_private.h
-    │       ├── [ 26K]  toxav.h
-    │       └── [ 12K]  toxencryptsave.h
-    └── [4.0K]  lib
-        ├── [697K]  libopus.a
-        ├── [575K]  libsodium.a
-        ├── [ 11K]  libssp.a
-        ├── [905K]  libtoxcore.a
-        ├── [449K]  libtoxcore.dll.a
-        ├── [2.9M]  libvpx.a
-        ├── [ 68K]  libwinpthread.a
-        └── [4.0K]  pkgconfig
-            ├── [ 252]  libsodium.pc
-            ├── [ 359]  opus.pc
-            ├── [ 249]  toxcore.pc
-            └── [ 311]  vpx.pc
-
-12 directories, 60 files
-```
-
-- `libtoxcore.dll` is the shared library. It is fully self-contained, with no
-  additional dependencies aside from the Windows OS dlls, and can be used in
-  MSVC, MinGW, Clang, etc. projects. Despite its name, it provides toxcore,
-  toxav, toxencryptsave -- all of Tox.
-- `libtoxcore.a` is the static library. In order to use it, it needs to be
-  linked against the other provided .a libraries (but not the .dll.a!) and
-  additionally -liphlpapi and -lws2_32 Windows dlls. It similarly provides all
-  of Tox APIs.
-- `libtoxcore.dll.a` is the MinGW import library for `libtoxcore.dll`.
-- `libtoxcore.lib` is the MSVC import library for `libtoxcore.dll`.
-- `libtoxcore.exp` and `libtoxcore.def` are the exported by `libtoxcore`
-  symbols.
-- `*.exe` are statically compiled executables -- `DHT_bootstrap` and
-  [the fun utils](#secondary).
-
-## Pre-built binaries
-
-### Linux
-
-Toxcore is packaged by at least by the following distributions: ALT Linux,
-[Arch Linux](https://www.archlinux.org/packages/?q=toxcore),
-[Fedora](https://apps.fedoraproject.org/packages/toxcore), Mageia, openSUSE,
-PCLinuxOS, ROSA and Slackware,
-[according to the information from pkgs.org](https://pkgs.org/download/toxcore).
-Note that this list might be incomplete and some other distributions might
-package it too.

README.md

@@ -1,205 +1,4 @@
-# ![Project Tox](https://raw.github.com/TokTok/c-toxcore/master/other/tox.png "Project Tox")
+# Tomato
 
-**Current Coverage:**
+![tomato](res/icon/tomato_v1_256.png)
-[![coverage](https://codecov.io/gh/TokTok/c-toxcore/branch/master/graph/badge.svg?token=BRfCKo02De)](https://codecov.io/gh/TokTok/c-toxcore)
 
-[**Website**](https://tox.chat) **|** [**Wiki**](https://wiki.tox.chat/) **|**
-[**Blog**](https://blog.tox.chat/) **|**
-[**FAQ**](https://wiki.tox.chat/doku.php?id=users:faq) **|**
-[**Binaries/Downloads**](https://tox.chat/download.html) **|**
-[**Clients**](https://wiki.tox.chat/doku.php?id=clients) **|**
-[**Compiling**](/INSTALL.md)
-
-## What is Tox
-
-Tox is a peer to peer (serverless) instant messenger aimed at making security
-and privacy easy to obtain for regular users. It uses
-[libsodium](https://doc.libsodium.org/) (based on
-[NaCl](https://nacl.cr.yp.to/)) for its encryption and authentication.
-
-## IMPORTANT!
-
-### ![Danger: Experimental](other/tox-warning.png)
-
-This is an **experimental** cryptographic network library. It has not been
-formally audited by an independent third party that specializes in cryptography
-or cryptanalysis. **Use this library at your own risk.**
-
-The underlying crypto library [libsodium](https://doc.libsodium.org/) provides
-reliable encryption, but the security model has not yet been fully specified.
-See [issue 210](https://github.com/TokTok/c-toxcore/issues/210) for a discussion
-on developing a threat model. See other issues for known weaknesses (e.g.
-[issue 426](https://github.com/TokTok/c-toxcore/issues/426) describes what can
-happen if your secret key is stolen).
-
-## Toxcore Development Roadmap
-
-The roadmap and changelog are generated from GitHub issues. You may view them on
-the website, where they are updated at least once every 24 hours:
-
-- Changelog: https://toktok.ltd/changelog/c-toxcore
-- Roadmap: https://toktok.ltd/roadmap/c-toxcore
-
-## Installing toxcore
-
-Detailed installation instructions can be found in [INSTALL.md](INSTALL.md).
-
-Be advised that due to the addition of `cmp` as a submodule, you now also need
-to initialize the git submodules required by toxcore. This can be done by
-cloning the repo with the following command:
-`git clone --recurse-submodules https://github.com/Toktok/c-toxcore` or by
-running `git submodule update --init` in the root directory of the repo.
-
-In a nutshell, if you have [libsodium](https://github.com/jedisct1/libsodium)
-installed, run:
-
-```sh
-mkdir _build && cd _build
-cmake ..
-make
-sudo make install
-```
-
-If you have [libvpx](https://github.com/webmproject/libvpx) and
-[opus](https://github.com/xiph/opus) installed, the above will also build the
-A/V library for multimedia chats.
-
-## Using toxcore
-
-The simplest "hello world" example could be an echo bot. Here we will walk
-through the implementation of a simple bot.
-
-### Creating the tox instance
-
-All toxcore API functions work with error parameters. They are enums with one
-`OK` value and several error codes that describe the different situations in
-which the function might fail.
-
-```c
-TOX_ERR_NEW err_new;
-Tox *tox = tox_new(NULL, &err_new);
-if (err_new != TOX_ERR_NEW_OK) {
-  fprintf(stderr, "tox_new failed with error code %d\n", err_new);
-  exit(1);
-}
-```
-
-Here, we simply exit the program, but in a real client you will probably want to
-do some error handling and proper error reporting to the user. The `NULL`
-argument given to the first parameter of `tox_new` is the `Tox_Options`. It
-contains various write-once network settings and allows you to load a previously
-serialised instance. See [toxcore/tox.h](tox.h) for details.
-
-### Setting up callbacks
-
-Toxcore works with callbacks that you can register to listen for certain events.
-Examples of such events are "friend request received" or "friend sent a
-message". Search the API for `tox_callback_*` to find all of them.
-
-Here, we will set up callbacks for receiving friend requests and receiving
-messages. We will always accept any friend request (because we're a bot), and
-when we receive a message, we send it back to the sender.
-
-```c
-tox_callback_friend_request(tox, handle_friend_request);
-tox_callback_friend_message(tox, handle_friend_message);
-```
-
-These two function calls set up the callbacks. Now we also need to implement
-these "handle" functions.
-
-### Handle friend requests
-
-```c
-static void handle_friend_request(
-  Tox *tox, const uint8_t *public_key, const uint8_t *message, size_t length,
-  void *user_data) {
-  // Accept the friend request:
-  TOX_ERR_FRIEND_ADD err_friend_add;
-  tox_friend_add_norequest(tox, public_key, &err_friend_add);
-  if (err_friend_add != TOX_ERR_FRIEND_ADD_OK) {
-    fprintf(stderr, "unable to add friend: %d\n", err_friend_add);
-  }
-}
-```
-
-The `tox_friend_add_norequest` function adds the friend without sending them a
-friend request. Since we already got a friend request, this is the right thing
-to do. If you wanted to send a friend request yourself, you would use
-`tox_friend_add`, which has an extra parameter for the message.
-
-### Handle messages
-
-Now, when the friend sends us a message, we want to respond to them by sending
-them the same message back. This will be our "echo".
-
-```c
-static void handle_friend_message(
-  Tox *tox, uint32_t friend_number, TOX_MESSAGE_TYPE type,
-  const uint8_t *message, size_t length,
-  void *user_data) {
-  TOX_ERR_FRIEND_SEND_MESSAGE err_send;
-  tox_friend_send_message(tox, friend_number, type, message, length,
-    &err_send);
-  if (err_send != TOX_ERR_FRIEND_SEND_MESSAGE_OK) {
-    fprintf(stderr, "unable to send message back to friend %d: %d\n",
-      friend_number, err_send);
-  }
-}
-```
-
-That's it for the setup. Now we want to actually run the bot.
-
-### Main event loop
-
-Toxcore works with a main event loop function `tox_iterate` that you need to
-call at a certain frequency dictated by `tox_iteration_interval`. This is a
-polling function that receives new network messages and processes them.
-
-```c
-while (true) {
-  usleep(1000 * tox_iteration_interval(tox));
-  tox_iterate(tox, NULL);
-}
-```
-
-That's it! Now you have a working echo bot. The only problem is that since Tox
-works with public keys, and you can't really guess your bot's public key, you
-can't add it as a friend in your client. For this, we need to call another API
-function: `tox_self_get_address(tox, address)`. This will fill the 38 byte
-friend address into the `address` buffer. You can then display that binary
-string as hex and input it into your client. Writing a `bin2hex` function is
-left as exercise for the reader.
-
-We glossed over a lot of details, such as the user data which we passed to
-`tox_iterate` (passing `NULL`), bootstrapping into an actual network (this bot
-will work in the LAN, but not on an internet server) and the fact that we now
-have no clean way of stopping the bot (`while (true)`). If you want to write a
-real bot, you will probably want to read up on all the API functions. Consult
-the API documentation in [toxcore/tox.h](toxcore/tox.h) for more information.
-
-### Other resources
-
-- [Another echo bot](https://wiki.tox.chat/developers/client_examples/echo_bot)
-- [minitox](https://github.com/hqwrong/minitox) (A minimal tox client)
-
-## SAST Tools
-
-This project uses various tools supporting Static Application Security Testing:
-
-- [clang-tidy](https://clang.llvm.org/extra/clang-tidy/): A clang-based C++
-  "linter" tool.
-- [Coverity](https://scan.coverity.com/): A cloud-based static analyzer service
-  for Java, C/C++, C#, JavaScript, Ruby, or Python that is free for open source
-  projects.
-- [cppcheck](https://cppcheck.sourceforge.io/): A static analyzer for C/C++
-  code.
-- [cpplint](https://github.com/cpplint/cpplint): Static code checker for C++
-- [goblint](https://goblint.in.tum.de/): A static analyzer for multi-threaded C
-  programs, specializing in finding concurrency bugs.
-- [infer](https://github.com/facebook/infer): A static analyzer for Java, C,
-  C++, and Objective-C.
-- [PVS-Studio](https://pvs-studio.com/en/pvs-studio/?utm_source=website&utm_medium=github&utm_campaign=open_source):
-  A static analyzer for C, C++, C#, and Java code.
-- [tokstyle](https://github.com/TokTok/hs-tokstyle): A style checker for TokTok
-  C projects.

auto_tests/CMakeLists.txt

@@ -1,119 +0,0 @@
-set(TEST_TIMEOUT_SECONDS "" CACHE STRING "Limit runtime of each test to the number of seconds specified")
-
-add_library(auto_test_support
-  auto_test_support.c
-  auto_test_support.h)
-target_link_libraries(auto_test_support PRIVATE misc_tools)
-if(TARGET toxcore_static)
-  target_link_libraries(auto_test_support PRIVATE toxcore_static)
-else()
-  target_link_libraries(auto_test_support PRIVATE toxcore_shared)
-endif()
-if(TARGET PThreads4W::PThreads4W)
-  target_link_libraries(auto_test_support PRIVATE PThreads4W::PThreads4W)
-elseif(TARGET Threads::Threads)
-  target_link_libraries(auto_test_support PRIVATE Threads::Threads)
-endif()
-
-function(auto_test target)
-  add_executable(auto_${target}_test ${target}_test.c)
-  target_link_libraries(auto_${target}_test PRIVATE misc_tools auto_test_support)
-  if(TARGET toxcore_static)
-    target_link_libraries(auto_${target}_test PRIVATE toxcore_static)
-  else()
-    target_link_libraries(auto_${target}_test PRIVATE toxcore_shared)
-  endif()
-  if(TARGET PThreads4W::PThreads4W)
-    target_link_libraries(auto_${target}_test PRIVATE PThreads4W::PThreads4W)
-  elseif(TARGET Threads::Threads)
-    target_link_libraries(auto_${target}_test PRIVATE Threads::Threads)
-  endif()
-  add_test(NAME ${target} COMMAND ${CROSSCOMPILING_EMULATOR} auto_${target}_test)
-  set_tests_properties(${target} PROPERTIES TIMEOUT "${TEST_TIMEOUT_SECONDS}")
-  # add the source dir as environment variable, so the testdata can be found
-  set_tests_properties(${target} PROPERTIES ENVIRONMENT "LLVM_PROFILE_FILE=${target}.profraw;srcdir=${CMAKE_CURRENT_SOURCE_DIR}")
-endfunction()
-
-auto_test(TCP)
-auto_test(announce)
-auto_test(conference)
-auto_test(conference_double_invite)
-auto_test(conference_invite_merge)
-auto_test(conference_peer_nick)
-auto_test(conference_simple)
-auto_test(conference_two)
-auto_test(crypto)
-#auto_test(dht)  # Doesn't work with UNITY_BUILD.
-auto_test(dht_getnodes_api)
-auto_test(encryptsave)
-auto_test(file_saving)
-auto_test(file_streaming)
-auto_test(file_transfer)
-auto_test(forwarding)
-auto_test(friend_connection)
-auto_test(friend_request)
-auto_test(friend_request_spam)
-auto_test(group_general)
-auto_test(group_invite)
-auto_test(group_message)
-auto_test(group_moderation)
-auto_test(group_save)
-auto_test(group_state)
-auto_test(group_sync)
-auto_test(group_tcp)
-auto_test(group_topic)
-auto_test(invalid_tcp_proxy)
-auto_test(invalid_udp_proxy)
-auto_test(lan_discovery)
-auto_test(lossless_packet)
-auto_test(lossy_packet)
-auto_test(network)
-auto_test(onion)
-auto_test(overflow_recvq)
-auto_test(overflow_sendq)
-auto_test(reconnect)
-auto_test(save_friend)
-auto_test(save_load)
-auto_test(send_message)
-auto_test(set_name)
-auto_test(set_status_message)
-auto_test(tox_dispatch)
-auto_test(tox_events)
-auto_test(tox_many)
-auto_test(tox_many_tcp)
-auto_test(tox_strncasecmp)
-auto_test(typing)
-auto_test(version)
-auto_test(save_compatibility)
-
-target_include_directories(auto_encryptsave_test SYSTEM PRIVATE ${LIBSODIUM_INCLUDE_DIRS})
-
-if(NON_HERMETIC_TESTS)
-  auto_test(bootstrap)
-  auto_test(tcp_relay)
-endif()
-
-if(BUILD_TOXAV)
-  auto_test(conference_av)
-  auto_test(toxav_basic)
-  auto_test(toxav_many)
-
-  if(MSVC)
-    target_link_libraries(auto_toxav_basic_test PRIVATE PkgConfig::VPX)
-    target_link_libraries(auto_toxav_many_test PRIVATE PkgConfig::VPX)
-  else()
-    target_link_libraries(auto_toxav_basic_test PRIVATE ${VPX_LIBRARIES})
-    target_link_directories(auto_toxav_basic_test PRIVATE ${VPX_LIBRARY_DIRS})
-    target_include_directories(auto_toxav_basic_test SYSTEM PRIVATE ${VPX_INCLUDE_DIRS})
-    target_compile_options(auto_toxav_basic_test PRIVATE ${VPX_CFLAGS_OTHER})
-
-    target_link_libraries(auto_toxav_many_test PRIVATE ${VPX_LIBRARIES})
-    target_link_directories(auto_toxav_many_test PRIVATE ${VPX_LIBRARY_DIRS})
-    target_include_directories(auto_toxav_many_test SYSTEM PRIVATE ${VPX_INCLUDE_DIRS})
-    target_compile_options(auto_toxav_many_test PRIVATE ${VPX_CFLAGS_OTHER})
-  endif()
-endif()
-
-if(PROXY_TEST)
-  auto_test(proxy)
-endif()

auto_tests/conference_simple_test.c

@@ -1,268 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "../testing/misc_tools.h"
-#include "../toxcore/tox.h"
-#include "../toxcore/tox_dispatch.h"
-#include "../toxcore/tox_events.h"
-#include "auto_test_support.h"
-#include "check_compat.h"
-
-typedef struct State {
-    uint32_t id;
-    Tox *tox;
-    bool self_online;
-    bool friend_online;
-    bool invited_next;
-
-    bool joined;
-    uint32_t conference;
-
-    bool received;
-
-    uint32_t peers;
-} State;
-
-static void handle_self_connection_status(const Tox_Event_Self_Connection_Status *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const Tox_Connection connection_status = tox_event_self_connection_status_get_connection_status(event);
-    fprintf(stderr, "self_connection_status(#%u, %d, _)\n", state->id, connection_status);
-    state->self_online = connection_status != TOX_CONNECTION_NONE;
-}
-
-static void handle_friend_connection_status(const Tox_Event_Friend_Connection_Status *event,
-        void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t friend_number = tox_event_friend_connection_status_get_friend_number(event);
-    const Tox_Connection connection_status = tox_event_friend_connection_status_get_connection_status(event);
-    fprintf(stderr, "handle_friend_connection_status(#%u, %u, %d, _)\n", state->id, friend_number, connection_status);
-    state->friend_online = connection_status != TOX_CONNECTION_NONE;
-}
-
-static void handle_conference_invite(const Tox_Event_Conference_Invite *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t friend_number = tox_event_conference_invite_get_friend_number(event);
-    const Tox_Conference_Type type = tox_event_conference_invite_get_type(event);
-    const uint8_t *cookie = tox_event_conference_invite_get_cookie(event);
-    const size_t length = tox_event_conference_invite_get_cookie_length(event);
-    fprintf(stderr, "handle_conference_invite(#%u, %u, %d, uint8_t[%u], _)\n",
-            state->id, friend_number, type, (unsigned)length);
-    fprintf(stderr, "tox%u joining conference\n", state->id);
-
-    {
-        Tox_Err_Conference_Join err;
-        state->conference = tox_conference_join(state->tox, friend_number, cookie, length, &err);
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_JOIN_OK, "failed to join a conference: err = %d", err);
-        fprintf(stderr, "tox%u Joined conference %u\n", state->id, state->conference);
-        state->joined = true;
-    }
-}
-
-static void handle_conference_message(const Tox_Event_Conference_Message *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t conference_number = tox_event_conference_message_get_conference_number(event);
-    const uint32_t peer_number = tox_event_conference_message_get_peer_number(event);
-    const Tox_Message_Type type = tox_event_conference_message_get_type(event);
-    const uint8_t *message = tox_event_conference_message_get_message(event);
-    const size_t length = tox_event_conference_message_get_message_length(event);
-
-    fprintf(stderr, "handle_conference_message(#%u, %u, %u, %d, uint8_t[%u], _)\n",
-            state->id, conference_number, peer_number, type, (unsigned)length);
-
-    fprintf(stderr, "tox%u got message: %s\n", state->id, (const char *)message);
-    state->received = true;
-}
-
-static void handle_conference_peer_list_changed(const Tox_Event_Conference_Peer_List_Changed *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t conference_number = tox_event_conference_peer_list_changed_get_conference_number(event);
-    fprintf(stderr, "handle_conference_peer_list_changed(#%u, %u, _)\n",
-            state->id, conference_number);
-
-    Tox_Err_Conference_Peer_Query err;
-    uint32_t count = tox_conference_peer_count(state->tox, conference_number, &err);
-
-    if (err != TOX_ERR_CONFERENCE_PEER_QUERY_OK) {
-        fprintf(stderr, "ERROR: %d\n", err);
-        exit(EXIT_FAILURE);
-    }
-
-    fprintf(stderr, "tox%u has %u peers online\n", state->id, count);
-    state->peers = count;
-}
-
-static void handle_conference_connected(const Tox_Event_Conference_Connected *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    // We're tox2, so now we invite tox3.
-    if (state->id == 2 && !state->invited_next) {
-        Tox_Err_Conference_Invite err;
-        tox_conference_invite(state->tox, 1, state->conference, &err);
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_INVITE_OK, "tox2 failed to invite tox3: err = %d", err);
-
-        state->invited_next = true;
-        fprintf(stderr, "tox2 invited tox3\n");
-    }
-}
-
-static void iterate_one(
-    Tox *tox, State *state, const Tox_Dispatch *dispatch)
-{
-    Tox_Err_Events_Iterate err;
-    Tox_Events *events = tox_events_iterate(tox, true, &err);
-    ck_assert(err == TOX_ERR_EVENTS_ITERATE_OK);
-    tox_dispatch_invoke(dispatch, events, state);
-    tox_events_free(events);
-}
-
-static void iterate3_wait(
-    State *state1, State *state2, State *state3,
-    const Tox_Dispatch *dispatch, int interval)
-{
-    iterate_one(state1->tox, state1, dispatch);
-    iterate_one(state2->tox, state2, dispatch);
-    iterate_one(state3->tox, state3, dispatch);
-
-    c_sleep(interval);
-}
-
-int main(void)
-{
-    setvbuf(stdout, nullptr, _IONBF, 0);
-
-    State state1 = {1};
-    State state2 = {2};
-    State state3 = {3};
-
-    // Create toxes.
-    state1.tox = tox_new_log(nullptr, nullptr, &state1.id);
-    state2.tox = tox_new_log(nullptr, nullptr, &state2.id);
-    state3.tox = tox_new_log(nullptr, nullptr, &state3.id);
-
-    tox_events_init(state1.tox);
-    tox_events_init(state2.tox);
-    tox_events_init(state3.tox);
-
-    // tox1 <-> tox2, tox2 <-> tox3
-    uint8_t key[TOX_PUBLIC_KEY_SIZE];
-    tox_self_get_public_key(state2.tox, key);
-    tox_friend_add_norequest(state1.tox, key, nullptr);  // tox1 -> tox2
-    tox_self_get_public_key(state1.tox, key);
-    tox_friend_add_norequest(state2.tox, key, nullptr);  // tox2 -> tox1
-    tox_self_get_public_key(state3.tox, key);
-    tox_friend_add_norequest(state2.tox, key, nullptr);  // tox2 -> tox3
-    tox_self_get_public_key(state2.tox, key);
-    tox_friend_add_norequest(state3.tox, key, nullptr);  // tox3 -> tox2
-
-    printf("bootstrapping tox2 and tox3 off tox1\n");
-    uint8_t dht_key[TOX_PUBLIC_KEY_SIZE];
-    tox_self_get_dht_id(state1.tox, dht_key);
-    const uint16_t dht_port = tox_self_get_udp_port(state1.tox, nullptr);
-
-    tox_bootstrap(state2.tox, "localhost", dht_port, dht_key, nullptr);
-    tox_bootstrap(state3.tox, "localhost", dht_port, dht_key, nullptr);
-
-    Tox_Dispatch *dispatch = tox_dispatch_new(nullptr);
-    ck_assert(dispatch != nullptr);
-
-    // Connection callbacks.
-    tox_events_callback_self_connection_status(dispatch, handle_self_connection_status);
-    tox_events_callback_friend_connection_status(dispatch, handle_friend_connection_status);
-
-    // Conference callbacks.
-    tox_events_callback_conference_invite(dispatch, handle_conference_invite);
-    tox_events_callback_conference_connected(dispatch, handle_conference_connected);
-    tox_events_callback_conference_message(dispatch, handle_conference_message);
-    tox_events_callback_conference_peer_list_changed(dispatch, handle_conference_peer_list_changed);
-
-    // Wait for self connection.
-    fprintf(stderr, "Waiting for toxes to come online\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (!state1.self_online || !state2.self_online || !state3.self_online);
-
-    fprintf(stderr, "Toxes are online\n");
-
-    // Wait for friend connection.
-    fprintf(stderr, "Waiting for friends to connect\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (!state1.friend_online || !state2.friend_online || !state3.friend_online);
-
-    fprintf(stderr, "Friends are connected\n");
-
-    {
-        // Create new conference, tox1 is the founder.
-        Tox_Err_Conference_New err;
-        state1.conference = tox_conference_new(state1.tox, &err);
-        state1.joined = true;
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_NEW_OK, "failed to create a conference: err = %d", err);
-        fprintf(stderr, "Created conference: id = %u\n", state1.conference);
-    }
-
-    {
-        // Invite friend.
-        Tox_Err_Conference_Invite err;
-        tox_conference_invite(state1.tox, 0, state1.conference, &err);
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_INVITE_OK, "failed to invite a friend: err = %d", err);
-        state1.invited_next = true;
-        fprintf(stderr, "tox1 invited tox2\n");
-    }
-
-    fprintf(stderr, "Waiting for invitation to arrive\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (!state1.joined || !state2.joined || !state3.joined);
-
-    fprintf(stderr, "Invitations accepted\n");
-
-    fprintf(stderr, "Waiting for peers to come online\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (state1.peers == 0 || state2.peers == 0 || state3.peers == 0);
-
-    fprintf(stderr, "All peers are online\n");
-
-    {
-        fprintf(stderr, "tox1 sends a message to the group: \"hello!\"\n");
-        Tox_Err_Conference_Send_Message err;
-        tox_conference_send_message(state1.tox, state1.conference, TOX_MESSAGE_TYPE_NORMAL,
-                                    (const uint8_t *)"hello!", 7, &err);
-
-        if (err != TOX_ERR_CONFERENCE_SEND_MESSAGE_OK) {
-            fprintf(stderr, "ERROR: %d\n", err);
-            exit(EXIT_FAILURE);
-        }
-    }
-
-    fprintf(stderr, "Waiting for messages to arrive\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-        c_sleep(100);
-    } while (!state2.received || !state3.received);
-
-    fprintf(stderr, "Messages received. Test complete.\n");
-
-    tox_dispatch_free(dispatch);
-    tox_kill(state3.tox);
-    tox_kill(state2.tox);
-    tox_kill(state1.tox);
-
-    return 0;
-}

auto_tests/file_streaming_test.c

@@ -1,272 +0,0 @@
-/* File transfer test: streaming version (no known size).
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#include "../testing/misc_tools.h"
-#include "../toxcore/ccompat.h"
-#include "../toxcore/tox.h"
-#include "../toxcore/util.h"
-#include "auto_test_support.h"
-#include "check_compat.h"
-
-#ifndef USE_IPV6
-#define USE_IPV6 1
-#endif
-
-#ifdef TOX_LOCALHOST
-#undef TOX_LOCALHOST
-#endif
-#if USE_IPV6
-#define TOX_LOCALHOST "::1"
-#else
-#define TOX_LOCALHOST "127.0.0.1"
-#endif
-
-static void accept_friend_request(Tox *m, const uint8_t *public_key, const uint8_t *data, size_t length, void *userdata)
-{
-    if (length == 7 && memcmp("Gentoo", data, 7) == 0) {
-        tox_friend_add_norequest(m, public_key, nullptr);
-    }
-}
-
-static uint64_t size_recv;
-static uint64_t sending_pos;
-
-static uint8_t file_cmp_id[TOX_FILE_ID_LENGTH];
-static uint32_t file_accepted;
-static uint64_t file_size;
-static void tox_file_receive(Tox *tox, uint32_t friend_number, uint32_t file_number, uint32_t kind, uint64_t filesize,
-                             const uint8_t *filename, size_t filename_length, void *userdata)
-{
-    ck_assert_msg(kind == TOX_FILE_KIND_DATA, "bad kind");
-
-    ck_assert_msg(filename_length == sizeof("Gentoo.exe")
-                  && memcmp(filename, "Gentoo.exe", sizeof("Gentoo.exe")) == 0, "bad filename");
-
-    uint8_t file_id[TOX_FILE_ID_LENGTH];
-
-    ck_assert_msg(tox_file_get_file_id(tox, friend_number, file_number, file_id, nullptr), "tox_file_get_file_id error");
-
-    ck_assert_msg(memcmp(file_id, file_cmp_id, TOX_FILE_ID_LENGTH) == 0, "bad file_id");
-
-    const uint8_t empty[TOX_FILE_ID_LENGTH] = {0};
-
-    ck_assert_msg(memcmp(empty, file_cmp_id, TOX_FILE_ID_LENGTH) != 0, "empty file_id");
-
-    file_size = filesize;
-
-    if (filesize) {
-        sending_pos = size_recv = 1337;
-
-        Tox_Err_File_Seek err_s;
-
-        ck_assert_msg(tox_file_seek(tox, friend_number, file_number, 1337, &err_s), "tox_file_seek error");
-
-        ck_assert_msg(err_s == TOX_ERR_FILE_SEEK_OK, "tox_file_seek wrong error");
-
-    } else {
-        sending_pos = size_recv = 0;
-    }
-
-    Tox_Err_File_Control error;
-
-    ck_assert_msg(tox_file_control(tox, friend_number, file_number, TOX_FILE_CONTROL_RESUME, &error),
-                  "tox_file_control failed. %i", error);
-    ++file_accepted;
-
-    Tox_Err_File_Seek err_s;
-
-    ck_assert_msg(!tox_file_seek(tox, friend_number, file_number, 1234, &err_s), "tox_file_seek no error");
-
-    ck_assert_msg(err_s == TOX_ERR_FILE_SEEK_DENIED, "tox_file_seek wrong error");
-}
-
-static uint32_t sendf_ok;
-static void file_print_control(Tox *tox, uint32_t friend_number, uint32_t file_number, Tox_File_Control control,
-                               void *userdata)
-{
-    /* First send file num is 0.*/
-    if (file_number == 0 && control == TOX_FILE_CONTROL_RESUME) {
-        sendf_ok = 1;
-    }
-}
-
-static uint64_t max_sending;
-static bool m_send_reached;
-static uint8_t sending_num;
-static bool file_sending_done;
-static void tox_file_chunk_request(Tox *tox, uint32_t friend_number, uint32_t file_number, uint64_t position,
-                                   size_t length, void *user_data)
-{
-    ck_assert_msg(sendf_ok, "didn't get resume control");
-
-    ck_assert_msg(sending_pos == position, "bad position %lu", (unsigned long)position);
-
-    if (length == 0) {
-        ck_assert_msg(!file_sending_done, "file sending already done");
-
-        file_sending_done = 1;
-        return;
-    }
-
-    if (position + length > max_sending) {
-        ck_assert_msg(!m_send_reached, "requested done file transfer");
-
-        length = max_sending - position;
-        m_send_reached = 1;
-    }
-
-    VLA(uint8_t, f_data, length);
-    memset(f_data, sending_num, length);
-
-    Tox_Err_File_Send_Chunk error;
-    tox_file_send_chunk(tox, friend_number, file_number, position, f_data, length, &error);
-
-    ck_assert_msg(error == TOX_ERR_FILE_SEND_CHUNK_OK,
-                  "could not send chunk, error num=%d pos=%d len=%d", (int)error, (int)position, (int)length);
-
-    ++sending_num;
-    sending_pos += length;
-}
-
-static uint8_t num;
-static bool file_recv;
-static void write_file(Tox *tox, uint32_t friendnumber, uint32_t filenumber, uint64_t position, const uint8_t *data,
-                       size_t length, void *user_data)
-{
-    ck_assert_msg(size_recv == position, "bad position");
-
-    if (length == 0) {
-        file_recv = 1;
-        return;
-    }
-
-    VLA(uint8_t, f_data, length);
-    memset(f_data, num, length);
-    ++num;
-
-    ck_assert_msg(memcmp(f_data, data, length) == 0, "FILE_CORRUPTED");
-
-    size_recv += length;
-}
-
-static void file_transfer_test(void)
-{
-    printf("Starting test: few_clients\n");
-    uint32_t index[] = { 1, 2, 3 };
-    long long unsigned int cur_time = time(nullptr);
-    Tox_Err_New t_n_error;
-    Tox *tox1 = tox_new_log(nullptr, &t_n_error, &index[0]);
-    ck_assert_msg(t_n_error == TOX_ERR_NEW_OK, "wrong error");
-    Tox *tox2 = tox_new_log(nullptr, &t_n_error, &index[1]);
-    ck_assert_msg(t_n_error == TOX_ERR_NEW_OK, "wrong error");
-    Tox *tox3 = tox_new_log(nullptr, &t_n_error, &index[2]);
-    ck_assert_msg(t_n_error == TOX_ERR_NEW_OK, "wrong error");
-
-    ck_assert_msg(tox1 && tox2 && tox3, "Failed to create 3 tox instances");
-
-    tox_callback_friend_request(tox2, accept_friend_request);
-    uint8_t address[TOX_ADDRESS_SIZE];
-    tox_self_get_address(tox2, address);
-    uint32_t test = tox_friend_add(tox3, address, (const uint8_t *)"Gentoo", 7, nullptr);
-    ck_assert_msg(test == 0, "Failed to add friend error code: %u", test);
-
-    uint8_t dht_key[TOX_PUBLIC_KEY_SIZE];
-    tox_self_get_dht_id(tox1, dht_key);
-    uint16_t dht_port = tox_self_get_udp_port(tox1, nullptr);
-
-    tox_bootstrap(tox2, TOX_LOCALHOST, dht_port, dht_key, nullptr);
-    tox_bootstrap(tox3, TOX_LOCALHOST, dht_port, dht_key, nullptr);
-
-    printf("Waiting for toxes to come online\n");
-
-    do {
-        tox_iterate(tox1, nullptr);
-        tox_iterate(tox2, nullptr);
-        tox_iterate(tox3, nullptr);
-
-        printf("Connections: self (%d, %d, %d), friends (%d, %d)\n",
-               tox_self_get_connection_status(tox1),
-               tox_self_get_connection_status(tox2),
-               tox_self_get_connection_status(tox3),
-               tox_friend_get_connection_status(tox2, 0, nullptr),
-               tox_friend_get_connection_status(tox3, 0, nullptr));
-        c_sleep(ITERATION_INTERVAL);
-    } while (tox_self_get_connection_status(tox1) == TOX_CONNECTION_NONE ||
-             tox_self_get_connection_status(tox2) == TOX_CONNECTION_NONE ||
-             tox_self_get_connection_status(tox3) == TOX_CONNECTION_NONE ||
-             tox_friend_get_connection_status(tox2, 0, nullptr) == TOX_CONNECTION_NONE ||
-             tox_friend_get_connection_status(tox3, 0, nullptr) == TOX_CONNECTION_NONE);
-
-    printf("Starting file transfer test: 100MiB file.\n");
-
-    file_accepted = file_size = sendf_ok = size_recv = 0;
-    file_recv = 0;
-    max_sending = UINT64_MAX;
-
-    printf("Starting file streaming transfer test.\n");
-
-    file_sending_done = 0;
-    file_accepted = 0;
-    file_size = 0;
-    sendf_ok = 0;
-    size_recv = 0;
-    file_recv = 0;
-    tox_callback_file_recv_chunk(tox3, write_file);
-    tox_callback_file_recv_control(tox2, file_print_control);
-    tox_callback_file_chunk_request(tox2, tox_file_chunk_request);
-    tox_callback_file_recv_control(tox3, file_print_control);
-    tox_callback_file_recv(tox3, tox_file_receive);
-    const uint64_t totalf_size = UINT64_MAX;
-    Tox_File_Number fnum = tox_file_send(
-                               tox2, 0, TOX_FILE_KIND_DATA, totalf_size, nullptr,
-                               (const uint8_t *)"Gentoo.exe", sizeof("Gentoo.exe"), nullptr);
-    ck_assert_msg(fnum != UINT32_MAX, "tox_new_file_sender fail");
-
-    Tox_Err_File_Get gfierr;
-    ck_assert_msg(!tox_file_get_file_id(tox2, 1, fnum, file_cmp_id, &gfierr), "tox_file_get_file_id didn't fail");
-    ck_assert_msg(gfierr == TOX_ERR_FILE_GET_FRIEND_NOT_FOUND, "wrong error");
-    ck_assert_msg(!tox_file_get_file_id(tox2, 0, fnum + 1, file_cmp_id, &gfierr), "tox_file_get_file_id didn't fail");
-    ck_assert_msg(gfierr == TOX_ERR_FILE_GET_NOT_FOUND, "wrong error");
-    ck_assert_msg(tox_file_get_file_id(tox2, 0, fnum, file_cmp_id, &gfierr), "tox_file_get_file_id failed");
-    ck_assert_msg(gfierr == TOX_ERR_FILE_GET_OK, "wrong error");
-
-    max_sending = 100 * 1024;
-    m_send_reached = 0;
-
-    do {
-        tox_iterate(tox1, nullptr);
-        tox_iterate(tox2, nullptr);
-        tox_iterate(tox3, nullptr);
-
-        uint32_t tox1_interval = tox_iteration_interval(tox1);
-        uint32_t tox2_interval = tox_iteration_interval(tox2);
-        uint32_t tox3_interval = tox_iteration_interval(tox3);
-
-        c_sleep(min_u32(tox1_interval, min_u32(tox2_interval, tox3_interval)));
-    } while (!file_sending_done);
-
-    ck_assert_msg(sendf_ok && file_recv && m_send_reached && totalf_size == file_size && size_recv == max_sending
-                  && sending_pos == size_recv && file_accepted == 1,
-                  "something went wrong in file transfer %u %u %u %u %u %u %u %lu %lu %lu %lu", sendf_ok, file_recv,
-                  m_send_reached, totalf_size == file_size, size_recv == max_sending, sending_pos == size_recv, file_accepted == 1,
-                  (unsigned long)totalf_size, (unsigned long)file_size,
-                  (unsigned long)size_recv, (unsigned long)sending_pos);
-
-    printf("file_transfer_test succeeded, took %llu seconds\n", time(nullptr) - cur_time);
-
-    tox_kill(tox1);
-    tox_kill(tox2);
-    tox_kill(tox3);
-}
-
-int main(void)
-{
-    setvbuf(stdout, nullptr, _IONBF, 0);
-    file_transfer_test();
-    return 0;
-}

auto_tests/tox_new_test.c

@@ -1,9 +0,0 @@
-#include "../toxcore/tox.h"
-
-#include "../toxcore/ccompat.h"
-
-int main(void)
-{
-    tox_kill(tox_new(nullptr, nullptr));
-    return 0;
-}

azure-pipelines.yml

@@ -1,15 +0,0 @@
-pool:
-  vmImage: "windows-2019"
-jobs:
-  - job: "windows_msvc_conan"
-    strategy:
-      matrix:
-        static:
-          conan.shared: "False"
-        shared:
-          conan.shared: "True"
-    steps:
-      - bash: python -m pip install conan==1.59.0
-      - bash: git submodule update --init --recursive
-      - bash: conan install -if _build -o with_tests=True -o shared=$(conan.shared) .
-      - bash: CONAN_CPU_COUNT=50 CTEST_OUTPUT_ON_FAILURE=1 conan build -bf _build -if _build . || true

cmake/Dependencies.cmake

@@ -1,36 +0,0 @@
-###############################################################################
-#
-# :: For systems that have pkg-config.
-#
-###############################################################################
-
-find_package(PkgConfig REQUIRED)
-
-find_library(NSL_LIBRARIES    nsl   )
-find_library(RT_LIBRARIES     rt    )
-find_library(SOCKET_LIBRARIES socket)
-
-find_package(pthreads QUIET)
-if(NOT TARGET PThreads4W::PThreads4W)
-  set(THREADS_PREFER_PTHREAD_FLAG ON)
-  find_package(Threads REQUIRED)
-endif()
-
-# For toxcore.
-pkg_search_module(LIBSODIUM   libsodium IMPORTED_TARGET REQUIRED)
-if(MSVC)
-  find_package(unofficial-sodium REQUIRED)
-endif()
-
-# For toxav.
-pkg_search_module(OPUS        opus      IMPORTED_TARGET)
-if(NOT OPUS_FOUND)
-  pkg_search_module(OPUS      Opus      IMPORTED_TARGET)
-endif()
-pkg_search_module(VPX         vpx       IMPORTED_TARGET)
-if(NOT VPX_FOUND)
-  pkg_search_module(VPX       libvpx    IMPORTED_TARGET)
-endif()
-
-# For tox-bootstrapd.
-pkg_search_module(LIBCONFIG   libconfig IMPORTED_TARGET)

cmake/ModulePackage.cmake

@@ -1,65 +0,0 @@
-option(ENABLE_SHARED "Build shared (dynamic) libraries for all modules" ON)
-option(ENABLE_STATIC "Build static libraries for all modules" ON)
-
-if(NOT ENABLE_SHARED AND NOT ENABLE_STATIC)
-  message(WARNING
-    "Both static and shared libraries are disabled; "
-    "enabling only shared libraries. Use -DENABLE_SHARED or -DENABLE_STATIC to "
-    "select one manually.")
-  set(ENABLE_SHARED ON)
-endif()
-
-option(FULLY_STATIC "Build fully static executables" OFF)
-if(FULLY_STATIC)
-  set(CMAKE_EXE_LINKER_FLAGS "-static -no-pie")
-  # remove -Wl,-Bdynamic
-  set(CMAKE_EXE_LINK_DYNAMIC_C_FLAGS)
-  set(CMAKE_EXE_LINK_DYNAMIC_CXX_FLAGS)
-  set(ENABLE_SHARED OFF)
-  set(ENABLE_STATIC ON)
-endif()
-
-function(install_module lib)
-  if(TARGET ${lib}_shared)
-    set_target_properties(${lib}_shared PROPERTIES
-      VERSION ${SOVERSION}
-      SOVERSION ${SOVERSION_MAJOR}
-    )
-    install(TARGETS ${lib}_shared
-      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-  endif()
-  if(TARGET ${lib}_static)
-    install(TARGETS ${lib}_static
-      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-  endif()
-
-  string(REPLACE ";" " " ${lib}_PKGCONFIG_LIBS "${${lib}_PKGCONFIG_LIBS}")
-  string(REPLACE ";" " " ${lib}_PKGCONFIG_REQUIRES "${${lib}_PKGCONFIG_REQUIRES}")
-
-  configure_file(
-    "${${lib}_SOURCE_DIR}/other/pkgconfig/${lib}.pc.in"
-    "${CMAKE_BINARY_DIR}/${lib}.pc"
-    @ONLY
-  )
-
-  configure_file(
-    "${toxcore_SOURCE_DIR}/other/rpm/${lib}.spec.in"
-    "${CMAKE_BINARY_DIR}/${lib}.spec"
-    @ONLY
-  )
-
-  install(FILES
-    ${CMAKE_BINARY_DIR}/${lib}.pc
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
-
-  foreach(sublib ${${lib}_API_HEADERS})
-    string(REPLACE "^" ";" sublib ${sublib})
-    list(GET sublib 0 header)
-
-    install(FILES ${header} ${ARGN})
-  endforeach()
-endfunction()

external/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
+
+add_subdirectory(./entt)
+
+add_subdirectory(./solanaceae_util)
+add_subdirectory(./solanaceae_contact)
+add_subdirectory(./solanaceae_message3)
+
+add_subdirectory(./solanaceae_plugin)
+
+add_subdirectory(./toxcore)
+add_subdirectory(./solanaceae_toxcore)
+add_subdirectory(./solanaceae_tox)
+
+add_subdirectory(./sdl)
+add_subdirectory(./imgui)
+
+add_subdirectory(./stb)
+add_subdirectory(./libwebp)
+

external/entt/CMakeLists.txt

@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
+
+add_subdirectory(./entt EXCLUDE_FROM_ALL)
+

external/entt/entt/.clang-format

@@ -0,0 +1,41 @@
+BasedOnStyle: llvm
+---
+AccessModifierOffset: -4
+AlignEscapedNewlines: DontAlign
+AllowShortBlocksOnASingleLine: Empty
+AllowShortEnumsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakTemplateDeclarations: Yes
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeTernaryOperators: true
+ColumnLimit: 0
+DerivePointerAlignment: false
+IncludeCategories:
+  - Regex: '<[[:alnum:]_]+>'
+    Priority: 1
+  - Regex: '<(gtest|gmock)/'
+    Priority: 2
+  - Regex: '<[[:alnum:]_./]+>'
+    Priority: 3
+  - Regex: '<entt/'
+    Priority: 4
+  - Regex: '.*'
+    Priority: 5
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+KeepEmptyLinesAtTheStartOfBlocks: false
+Language: Cpp
+PointerAlignment: Right
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: false
+SpaceAroundPointerQualifiers: After
+SpaceBeforeCaseColon: false
+SpaceBeforeCtorInitializerColon: false
+SpaceBeforeInheritanceColon: false
+SpaceBeforeParens: Never
+SpaceBeforeRangeBasedForLoopColon: false
+Standard: Latest
+TabWidth: 4
+UseTab: Never

external/entt/entt/.github/FUNDING.yml

@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: skypjack
+custom: https://www.paypal.me/skypjack

external/entt/entt/.github/workflows/analyzer.yml

@@ -0,0 +1,55 @@
+name: analyzer
+
+on:
+  push:
+    branches:
+      - master
+      - wip
+
+jobs:
+
+  iwyu:
+    timeout-minutes: 30
+
+    env:
+      IWYU: 0.18
+      LLVM: 14
+
+    runs-on: ubuntu-latest
+    continue-on-error: true
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install llvm/clang
+      # see: https://apt.llvm.org/
+      run: |
+        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+        sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-$LLVM main"
+        sudo apt update
+        sudo apt remove -y "llvm*"
+        sudo apt remove -y "libclang-dev*"
+        sudo apt remove -y "clang*"
+        sudo apt install -y llvm-$LLVM-dev
+        sudo apt install -y libclang-$LLVM-dev
+        sudo apt install -y clang-$LLVM
+    - name: Compile iwyu
+      # see: https://github.com/include-what-you-use/include-what-you-use
+      working-directory: build
+      run: |
+        git clone https://github.com/include-what-you-use/include-what-you-use.git --branch $IWYU --depth 1
+        mkdir include-what-you-use/build
+        cd include-what-you-use/build
+        cmake -DCMAKE_C_COMPILER=clang-$LLVM -DCMAKE_CXX_COMPILER=clang++-$LLVM -DCMAKE_INSTALL_PREFIX=./ ..
+        make -j4
+        bin/include-what-you-use --version
+    - name: Compile tests
+      working-directory: build
+      run: |
+        export PATH=$PATH:${GITHUB_WORKSPACE}/build/include-what-you-use/build/bin
+        cmake -DENTT_BUILD_TESTING=ON \
+              -DENTT_BUILD_BENCHMARK=ON \
+              -DENTT_BUILD_EXAMPLE=ON \
+              -DENTT_BUILD_LIB=ON \
+              -DENTT_BUILD_SNAPSHOT=ON \
+              -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE="include-what-you-use;-Xiwyu;--mapping_file=${GITHUB_WORKSPACE}/entt.imp;-Xiwyu;--no_fwd_decls;-Xiwyu;--verbose=1" ..
+        make -j4

external/entt/entt/.github/workflows/build.yml

@@ -0,0 +1,169 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+
+  linux:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        compiler:
+          - pkg: g++-7
+            exe: g++-7
+          - pkg: g++-8
+            exe: g++-8
+          - pkg: g++-9
+            exe: g++-9
+          - pkg: g++-10
+            exe: g++-10
+          - pkg: clang-8
+            exe: clang++-8
+          - pkg: clang-9
+            exe: clang++-9
+          - pkg: clang-10
+            exe: clang++-10
+          - pkg: clang-11
+            exe: clang++-11
+          - pkg: clang-12
+            exe: clang++-12
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install compiler
+      run: |
+        sudo apt update
+        sudo apt install -y ${{ matrix.compiler.pkg }}
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXX: ${{ matrix.compiler.exe }}
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  linux-extra:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        compiler: [g++, clang++]
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXX: ${{ matrix.compiler }}
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  windows:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        toolset: [default, v141, v142, clang-cl]
+        include:
+          - toolset: v141
+            toolset_option: -T"v141"
+          - toolset: v142
+            toolset_option: -T"v142"
+          - toolset: clang-cl
+            toolset_option: -T"ClangCl"
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ${{ matrix.toolset_option }} ..
+        cmake --build . -j 4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  windows-extra:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        cmake --build . -j 4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  macos:
+    timeout-minutes: 15
+    runs-on: macOS-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  macos-extra:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: macOS-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4

external/entt/entt/.github/workflows/coverage.yml

@@ -0,0 +1,38 @@
+name: coverage
+
+on: [push, pull_request]
+
+jobs:
+
+  codecov:
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXXFLAGS: "--coverage -fno-inline"
+        CXX: g++
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+    - name: Collect data
+      working-directory: build
+      run: |
+        sudo apt install lcov
+        lcov -c -d . -o coverage.info
+        lcov -l coverage.info
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v2
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: build/coverage.info
+        name: EnTT
+        fail_ci_if_error: true

external/entt/entt/.github/workflows/deploy.yml

@@ -0,0 +1,39 @@
+name: deploy
+
+on:
+  release:
+    types: published
+
+jobs:
+
+  homebrew-entt:
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+
+    env:
+      GH_REPO: homebrew-entt
+      FORMULA: entt.rb
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Clone repository
+      working-directory: build
+      env:
+        PERSONAL_ACCESS_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+      run: git clone https://$GITHUB_ACTOR:$PERSONAL_ACCESS_TOKEN@github.com/$GITHUB_ACTOR/$GH_REPO.git
+    - name: Prepare formula
+      working-directory: build
+      run: |
+        cd $GH_REPO
+        curl "https://github.com/${{ github.repository }}/archive/${{ github.ref }}.tar.gz" --location --fail --silent --show-error --output archive.tar.gz
+        sed -i -e '/url/s/".*"/"'$(echo "https://github.com/${{ github.repository }}/archive/${{ github.ref }}.tar.gz" | sed -e 's/[\/&]/\\&/g')'"/' $FORMULA
+        sed -i -e '/sha256/s/".*"/"'$(openssl sha256 archive.tar.gz | cut -d " " -f 2)'"/' $FORMULA
+    - name: Update remote
+      working-directory: build
+      run: |
+        cd $GH_REPO
+        git config --local user.email "action@github.com"
+        git config --local user.name "$GITHUB_ACTOR"
+        git add $FORMULA
+        git commit -m "Update to ${{ github.ref }}"
+        git push origin master

external/entt/entt/.github/workflows/sanitizer.yml

@@ -0,0 +1,31 @@
+name: sanitizer
+
+on: [push, pull_request]
+
+jobs:
+
+  clang:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        compiler: [clang++]
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXX: ${{ matrix.compiler }}
+      run: |
+        cmake -DENTT_USE_SANITIZER=ON -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4

external/entt/entt/.gitignore

@@ -0,0 +1,13 @@
+# Conan
+conan/test_package/build
+
+# IDEs
+*.user
+.idea
+.vscode
+.vs
+CMakeSettings.json
+cpp.hint
+
+# Bazel
+/bazel-*

external/entt/entt/AUTHORS

@@ -0,0 +1,56 @@
+# Author
+
+skypjack
+
+# Contributors
+
+alexames
+BenediktConze
+bjadamson
+ceeac
+ColinH
+corystegel
+Croydon
+cschreib
+cugone
+dbacchet
+dBagrat
+djarek
+DNKpp
+DonKult
+drglove
+eliasdaler
+erez-o
+eugeneko
+gale83
+ghost
+grdowns
+Green-Sky
+Innokentiy-Alaytsev
+Kerndog73
+Koward
+Lawrencemm
+markand
+mhammerc
+Milerius
+Minimonium
+morbo84
+m-waka
+netpoetica
+NixAJ
+Oortonaut
+Paolo-Oliverio
+pgruenbacher
+prowolf
+Qix-
+stefanofiorentino
+suVrik
+szunhammer
+The5-1
+vblanco20-1
+willtunnels
+WizardIke
+WoLfulus 
+w1th0utnam3
+xissburg
+zaucy

external/entt/entt/BUILD.bazel

@@ -0,0 +1,14 @@
+_msvc_copts = ["/std:c++17"]	
+_gcc_copts = ["-std=c++17"]
+
+cc_library(
+    name = "entt",
+    visibility = ["//visibility:public"],
+    strip_include_prefix = "src",
+    hdrs = glob(["src/**/*.h", "src/**/*.hpp"]),
+    copts = select({
+      "@bazel_tools//src/conditions:windows": _msvc_copts,
+      "@bazel_tools//src/conditions:windows_msvc": _msvc_copts,
+      "//conditions:default": _gcc_copts,
+    }),
+)

external/entt/entt/CMakeLists.txt

@@ -0,0 +1,325 @@
+#
+# EnTT
+#
+
+cmake_minimum_required(VERSION 3.12.4)
+
+#
+# Read project version
+#
+
+set(ENTT_VERSION_REGEX "#define ENTT_VERSION_.*[ \t]+(.+)")
+file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/src/entt/config/version.h" ENTT_VERSION REGEX ${ENTT_VERSION_REGEX})
+list(TRANSFORM ENTT_VERSION REPLACE ${ENTT_VERSION_REGEX} "\\1")
+string(JOIN "." ENTT_VERSION ${ENTT_VERSION})
+
+#
+# Project configuration
+#
+
+project(
+    EnTT
+    VERSION ${ENTT_VERSION}
+    DESCRIPTION "Gaming meets modern C++ - a fast and reliable entity-component system (ECS) and much more"
+    HOMEPAGE_URL "https://github.com/skypjack/entt"
+    LANGUAGES C CXX
+)
+
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Debug)
+endif()
+
+message(VERBOSE "*")
+message(VERBOSE "* ${PROJECT_NAME} v${PROJECT_VERSION} (${CMAKE_BUILD_TYPE})")
+message(VERBOSE "* Copyright (c) 2017-2022 Michele Caini <michele.caini@gmail.com>")
+message(VERBOSE "*")
+
+#
+# CMake stuff
+#
+
+list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules)
+
+#
+# Compiler stuff
+#
+
+option(ENTT_USE_LIBCPP "Use libc++ by adding -stdlib=libc++ flag if available." OFF)
+option(ENTT_USE_SANITIZER "Enable sanitizers by adding -fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined flags if available." OFF)
+
+if(ENTT_USE_LIBCPP)
+    if(NOT WIN32)
+        include(CheckCXXSourceCompiles)
+        include(CMakePushCheckState)
+
+        cmake_push_check_state()
+
+        set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -stdlib=libc++")
+
+        check_cxx_source_compiles("
+            #include<type_traits>
+            int main() { return std::is_same_v<int, char>; }
+        " ENTT_HAS_LIBCPP)
+
+        cmake_pop_check_state()
+    endif()
+
+    if(NOT ENTT_HAS_LIBCPP)
+        message(VERBOSE "The option ENTT_USE_LIBCPP is set but libc++ is not available. The flag will not be added to the target.")
+    endif()
+endif()
+
+if(ENTT_USE_SANITIZER)
+    if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
+        set(ENTT_HAS_SANITIZER TRUE CACHE BOOL "" FORCE)
+        mark_as_advanced(ENTT_HAS_SANITIZER)
+    endif()
+
+    if(NOT ENTT_HAS_SANITIZER)
+        message(VERBOSE "The option ENTT_USE_SANITIZER is set but sanitizer support is not available. The flags will not be added to the target.")
+    endif()
+endif()
+
+#
+# Add EnTT target
+#
+
+option(ENTT_INCLUDE_HEADERS "Add all EnTT headers to the EnTT target." OFF)
+option(ENTT_INCLUDE_NATVIS "Add EnTT natvis files to the EnTT target." OFF)
+
+if(ENTT_INCLUDE_NATVIS)
+    if(MSVC)
+        set(ENTT_HAS_NATVIS TRUE CACHE BOOL "" FORCE)
+        mark_as_advanced(ENTT_HAS_NATVIS)
+    endif()
+
+    if(NOT ENTT_HAS_NATVIS)
+        message(VERBOSE "The option ENTT_INCLUDE_NATVIS is set but natvis files are not supported. They will not be added to the target.")
+    endif()
+endif()
+
+include(GNUInstallDirs)
+
+add_library(EnTT INTERFACE)
+add_library(EnTT::EnTT ALIAS EnTT)
+
+target_include_directories(
+    EnTT
+    INTERFACE
+        $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+
+target_compile_features(EnTT INTERFACE cxx_std_17)
+
+if(ENTT_INCLUDE_HEADERS)
+    target_sources(
+        EnTT
+        INTERFACE
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/config/config.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/config/macro.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/config/version.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/container/dense_map.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/container/dense_set.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/container/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/algorithm.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/any.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/attribute.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/compressed_pair.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/enum.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/family.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/hashed_string.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/ident.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/iterator.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/memory.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/monostate.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/tuple.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/type_info.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/type_traits.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/utility.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/component.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/entity.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/group.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/handle.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/helper.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/observer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/organizer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/registry.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/runtime_view.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/snapshot.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/sparse_set.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/storage.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/storage_mixin.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/view.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/adjacency_matrix.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/dot.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/flow.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/locator/locator.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/adl_pointer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/container.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/context.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/factory.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/meta.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/node.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/pointer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/policy.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/range.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/resolve.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/template.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/type_traits.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/utility.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/platform/android-ndk-r17.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/poly/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/poly/poly.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/process/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/process/process.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/process/scheduler.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/cache.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/loader.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/resource.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/delegate.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/dispatcher.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/emitter.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/sigh.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entt.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/fwd.hpp>
+    )
+endif()
+
+if(ENTT_HAS_NATVIS)
+    target_sources(
+        EnTT
+        INTERFACE
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/config.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/container.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/core.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/entity.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/graph.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/locator.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/meta.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/platform.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/poly.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/process.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/resource.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/signal.natvis>
+    )
+endif()
+
+if(ENTT_HAS_SANITIZER)
+    target_compile_options(EnTT INTERFACE $<$<CONFIG:Debug>:-fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined>)
+    target_link_libraries(EnTT INTERFACE $<$<CONFIG:Debug>:-fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined>)
+endif()
+
+if(ENTT_HAS_LIBCPP)
+    target_compile_options(EnTT BEFORE INTERFACE -stdlib=libc++)
+endif()
+
+#
+# Install pkg-config file
+#
+
+include(JoinPaths)
+
+set(EnTT_PKGCONFIG ${CMAKE_CURRENT_BINARY_DIR}/entt.pc)
+
+join_paths(EnTT_PKGCONFIG_INCLUDEDIR "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
+
+configure_file(
+    ${EnTT_SOURCE_DIR}/cmake/in/entt.pc.in
+    ${EnTT_PKGCONFIG}
+    @ONLY
+)
+
+install(
+    FILES ${EnTT_PKGCONFIG}
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+)
+
+#
+# Install EnTT
+#
+
+include(CMakePackageConfigHelpers)
+
+install(
+    TARGETS EnTT
+    EXPORT EnTTTargets
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+write_basic_package_version_file(
+    EnTTConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion
+)
+
+configure_package_config_file(
+    ${EnTT_SOURCE_DIR}/cmake/in/EnTTConfig.cmake.in
+    EnTTConfig.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/EnTT/cmake
+)
+
+export(
+    EXPORT EnTTTargets
+    FILE ${CMAKE_CURRENT_BINARY_DIR}/EnTTTargets.cmake
+    NAMESPACE EnTT::
+)
+
+install(
+    EXPORT EnTTTargets
+    FILE EnTTTargets.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/EnTT/cmake
+    NAMESPACE EnTT::
+)
+
+install(
+    FILES
+        ${PROJECT_BINARY_DIR}/EnTTConfig.cmake
+        ${PROJECT_BINARY_DIR}/EnTTConfigVersion.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/EnTT/cmake
+)
+
+install(DIRECTORY src/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+
+export(PACKAGE EnTT)
+
+#
+# Tests
+#
+
+option(ENTT_BUILD_TESTING "Enable building tests." OFF)
+
+if(ENTT_BUILD_TESTING)
+    option(ENTT_FIND_GTEST_PACKAGE "Enable finding gtest package." OFF)
+    option(ENTT_BUILD_BENCHMARK "Build benchmark." OFF)
+    option(ENTT_BUILD_EXAMPLE "Build examples." OFF)
+    option(ENTT_BUILD_LIB "Build lib tests." OFF)
+    option(ENTT_BUILD_SNAPSHOT "Build snapshot test with Cereal." OFF)
+
+    set(ENTT_ID_TYPE std::uint32_t CACHE STRING "Type of identifiers to use for the tests")
+    set(ENTT_CXX_STD cxx_std_17 CACHE STRING "C++ standard revision to use for the tests")
+
+    include(CTest)
+    enable_testing()
+    add_subdirectory(test)
+endif()
+
+#
+# Documentation
+#
+
+option(ENTT_BUILD_DOCS "Enable building with documentation." OFF)
+
+if(ENTT_BUILD_DOCS)
+    find_package(Doxygen 1.8)
+
+    if(DOXYGEN_FOUND)
+        add_subdirectory(docs)
+    endif()
+endif()

external/entt/entt/CONTRIBUTING.md

@@ -0,0 +1,43 @@
+# Contributing
+
+First of all, thank you very much for taking the time to contribute to the
+`EnTT` library.<br/>
+How to do it mostly depends on the type of contribution:
+
+* If you have a question, **please** ensure there isn't already an answer for
+  you by searching on GitHub under
+  [issues](https://github.com/skypjack/entt/issues). Do not forget to search
+  also through the closed ones. If you are unable to find a proper answer, feel
+  free to [open a new issue](https://github.com/skypjack/entt/issues/new).
+  Usually, questions are marked as such and closed in a few days.
+
+* If you want to fix a typo in the inline documentation or in the README file,
+  if you want to add some new sections or if you want to help me with the
+  language by reviewing what I wrote so far (I'm not a native speaker after
+  all), **please** open a new
+  [pull request](https://github.com/skypjack/entt/pulls) with your changes.
+
+* If you found a bug, **please** ensure there isn't already an answer for you by
+  searching on GitHub under [issues](https://github.com/skypjack/entt/issues).
+  If you are unable to find an open issue addressing the problem, feel free to
+  [open a new one](https://github.com/skypjack/entt/issues/new). **Please**, do
+  not forget to carefully describe how to reproduce the problem, then add all
+  the information about the system on which you are experiencing it and point
+  out the version of `EnTT` you are using (tag or commit).
+
+* If you found a bug and you wrote a patch to fix it, open a new
+  [pull request](https://github.com/skypjack/entt/pulls) with your code.
+  **Please**, add some tests to avoid regressions in future if possible, it
+  would be really appreciated. Note that the `EnTT` library has a
+  [coverage at 100%](https://coveralls.io/github/skypjack/entt?branch=master)
+  (at least it was at 100% at the time I wrote this file) and this is the reason
+  for which you can be confident with using it in a production environment.
+
+* If you want to propose a new feature and you know how to code it, **please**
+  do not issue directly a pull request. Before to do it,
+  [create a new issue](https://github.com/skypjack/entt/issues/new) to discuss
+  your proposal. Other users could be interested in your idea and the discussion
+  that will follow can refine it and therefore give us a better solution.
+
+* If you want to request a new feature, I'm available for hiring. Take a look at
+  [my profile](https://github.com/skypjack) and feel free to write me.

external/entt/entt/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017-2022 Michele Caini, author of EnTT
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copy of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copy or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

external/entt/entt/README.md

@@ -0,0 +1,431 @@
+![EnTT: Gaming meets modern C++](https://user-images.githubusercontent.com/1812216/103550016-90752280-4ea8-11eb-8667-12ed2219e137.png)
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+[![Build Status](https://github.com/skypjack/entt/workflows/build/badge.svg)](https://github.com/skypjack/entt/actions)
+[![Coverage](https://codecov.io/gh/skypjack/entt/branch/master/graph/badge.svg)](https://codecov.io/gh/skypjack/entt)
+[![Try online](https://img.shields.io/badge/try-online-brightgreen)](https://godbolt.org/z/zxW73f)
+[![Documentation](https://img.shields.io/badge/docs-docsforge-blue)](http://entt.docsforge.com/)
+[![Gitter chat](https://badges.gitter.im/skypjack/entt.png)](https://gitter.im/skypjack/entt)
+[![Discord channel](https://img.shields.io/discord/707607951396962417?logo=discord)](https://discord.gg/5BjPWBd)
+[![Donate](https://img.shields.io/badge/donate-paypal-blue.svg)](https://www.paypal.me/skypjack)
+
+> `EnTT` has been a dream so far, we haven't found a single bug to date and it's
+> super easy to work with
+>
+> -- Every EnTT User Ever
+
+`EnTT` is a header-only, tiny and easy to use library for game programming and
+much more written in **modern C++**.<br/>
+[Among others](https://github.com/skypjack/entt/wiki/EnTT-in-Action), it's used
+in [**Minecraft**](https://minecraft.net/en-us/attribution/) by Mojang, the
+[**ArcGIS Runtime SDKs**](https://developers.arcgis.com/arcgis-runtime/) by Esri
+and the amazing [**Ragdoll**](https://ragdolldynamics.com/).<br/>
+If you don't see your project in the list, please open an issue, submit a PR or
+add the [#entt](https://github.com/topics/entt) tag to your _topics_! :+1:
+
+---
+
+Do you want to **keep up with changes** or do you have a **question** that
+doesn't require you to open an issue?<br/>
+Join the [gitter channel](https://gitter.im/skypjack/entt) and the
+[discord server](https://discord.gg/5BjPWBd), meet other users like you. The
+more we are, the better for everyone.<br/>
+Don't forget to check the
+[FAQs](https://github.com/skypjack/entt/wiki/Frequently-Asked-Questions) and the
+[wiki](https://github.com/skypjack/entt/wiki) too. Your answers may already be
+there.
+
+Do you want to support `EnTT`? Consider becoming a
+[**sponsor**](https://github.com/users/skypjack/sponsorship).
+Many thanks to [these people](https://skypjack.github.io/sponsorship/) and
+**special** thanks to:
+
+[![mojang](https://user-images.githubusercontent.com/1812216/106253145-67ca1980-6217-11eb-9c0b-d93561b37098.png)](https://mojang.com)
+[![imgly](https://user-images.githubusercontent.com/1812216/106253726-271ed000-6218-11eb-98e0-c9c681925770.png)](https://img.ly/)
+
+# Table of Contents
+
+* [Introduction](#introduction)
+  * [Code Example](#code-example)
+  * [Motivation](#motivation)
+  * [Performance](#performance)
+* [Integration](#integration)
+  * [Requirements](#requirements)
+  * [CMake](#cmake)
+  * [Natvis support](#natvis-support)
+  * [Packaging Tools](#packaging-tools)
+  * [pkg-config](#pkg-config)
+* [Documentation](#documentation)
+* [Tests](#tests)
+* [EnTT in Action](#entt-in-action)
+* [Contributors](#contributors)
+* [License](#license)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+The entity-component-system (also known as _ECS_) is an architectural pattern
+used mostly in game development. For further details:
+
+* [Entity Systems Wiki](http://entity-systems.wikidot.com/)
+* [Evolve Your Hierarchy](http://cowboyprogramming.com/2007/01/05/evolve-your-heirachy/)
+* [ECS on Wikipedia](https://en.wikipedia.org/wiki/Entity%E2%80%93component%E2%80%93system)
+
+This project started off as a pure entity-component system. Over time the
+codebase has grown as more and more classes and functionalities were added.<br/>
+Here is a brief, yet incomplete list of what it offers today:
+
+* Built-in **RTTI system** mostly similar to the standard one.
+* A `constexpr` utility for human-readable **resource names**.
+* Minimal **configuration system** built using the monostate pattern.
+* Incredibly fast **entity-component system** with its own _pay for what you
+  use_ policy, unconstrained component types with optional pointer stability and
+  hooks for storage customization.
+* Views and groups to iterate entities and components and allow different access
+  patterns, from **perfect SoA** to fully random.
+* A lot of **facilities** built on top of the entity-component system to help
+  the users and avoid reinventing the wheel.
+* General purpose **execution graph builder** for optimal scheduling.
+* The smallest and most basic implementation of a **service locator** ever seen.
+* A built-in, non-intrusive and macro-free runtime **reflection system**.
+* **Static polymorphism** made simple and within everyone's reach.
+* A few homemade containers, like a sparse set based **hash map**.
+* A **cooperative scheduler** for processes of any type.
+* All that is needed for **resource management** (cache, loaders, handles).
+* Delegates, **signal handlers** and a tiny event dispatcher.
+* A general purpose **event emitter** as a CRTP idiom based class template.
+* And **much more**! Check out the
+  [**wiki**](https://github.com/skypjack/entt/wiki).
+
+Consider this list a work in progress as well as the project. The whole API is
+fully documented in-code for those who are brave enough to read it.<br/>
+Please, do note that all tools are also DLL-friendly now and run smoothly across
+boundaries.
+
+One thing known to most is that `EnTT` is also used in **Minecraft**.<br/>
+Given that the game is available literally everywhere, I can confidently say 
+that the library has been sufficiently tested on every platform that can come to 
+mind.
+
+## Code Example
+
+```cpp
+#include <entt/entt.hpp>
+
+struct position {
+    float x;
+    float y;
+};
+
+struct velocity {
+    float dx;
+    float dy;
+};
+
+void update(entt::registry &registry) {
+    auto view = registry.view<const position, velocity>();
+
+    // use a callback
+    view.each([](const auto &pos, auto &vel) { /* ... */ });
+
+    // use an extended callback
+    view.each([](const auto entity, const auto &pos, auto &vel) { /* ... */ });
+
+    // use a range-for
+    for(auto [entity, pos, vel]: view.each()) {
+        // ...
+    }
+
+    // use forward iterators and get only the components of interest
+    for(auto entity: view) {
+        auto &vel = view.get<velocity>(entity);
+        // ...
+    }
+}
+
+int main() {
+    entt::registry registry;
+
+    for(auto i = 0u; i < 10u; ++i) {
+        const auto entity = registry.create();
+        registry.emplace<position>(entity, i * 1.f, i * 1.f);
+        if(i % 2 == 0) { registry.emplace<velocity>(entity, i * .1f, i * .1f); }
+    }
+
+    update(registry);
+}
+```
+
+## Motivation
+
+I started developing `EnTT` for the _wrong_ reason: my goal was to design an
+entity-component system to beat another well known open source library both in
+terms of performance and possibly memory usage.<br/>
+In the end, I did it, but it wasn't very satisfying. Actually it wasn't
+satisfying at all. The fastest and nothing more, fairly little indeed. When I
+realized it, I tried hard to keep intact the great performance of `EnTT` and to
+add all the features I wanted to see in *my own library* at the same time.
+
+Nowadays, `EnTT` is finally what I was looking for: still faster than its
+_competitors_, lower memory usage in the average case, a really good API and an
+amazing set of features. And even more, of course.
+
+## Performance
+
+The proposed entity-component system is incredibly fast to iterate entities and
+components, this is a fact. Some compilers make a lot of optimizations because
+of how `EnTT` works, some others aren't that good. In general, if we consider
+real world cases, `EnTT` is somewhere between a bit and much faster than many of
+the other solutions around, although I couldn't check them all for obvious
+reasons.
+
+If you are interested, you can compile the `benchmark` test in release mode (to
+enable compiler optimizations, otherwise it would make little sense) by setting
+the `ENTT_BUILD_BENCHMARK` option of `CMake` to `ON`, then evaluate yourself
+whether you're satisfied with the results or not.
+
+Honestly I got tired of updating the README file whenever there is an
+improvement.<br/>
+There are already a lot of projects out there that use `EnTT` as a basis for
+comparison (this should already tell you a lot). Many of these benchmarks are
+completely wrong, many others are simply incomplete, good at omitting some
+information and using the wrong function to compare a given feature. Certainly
+there are also good ones but they age quickly if nobody updates them, especially
+when the library they are dealing with is actively developed.
+
+The choice to use `EnTT` should be based on its carefully designed API, its
+set of features and the general performance, **not** because some single
+benchmark shows it to be the fastest tool available.
+
+In the future I'll likely try to get even better performance while still adding
+new features, mainly for fun.<br/>
+If you want to contribute and/or have suggestions, feel free to make a PR or
+open an issue to discuss your idea.
+
+# Integration
+
+`EnTT` is a header-only library. This means that including the `entt.hpp` header
+is enough to include the library as a whole and use it. For those who are
+interested only in the entity-component system, consider to include the sole
+`entity/registry.hpp` header instead.<br/>
+It's a matter of adding the following line to the top of a file:
+
+```cpp
+#include <entt/entt.hpp>
+```
+
+Use the line below to include only the entity-component system instead:
+
+```cpp
+#include <entt/entity/registry.hpp>
+```
+
+Then pass the proper `-I` argument to the compiler to add the `src` directory to
+the include paths.
+
+## Requirements
+
+To be able to use `EnTT`, users must provide a full-featured compiler that
+supports at least C++17.<br/>
+The requirements below are mandatory to compile the tests and to extract the
+documentation:
+
+* `CMake` version 3.7 or later.
+* `Doxygen` version 1.8 or later.
+
+Alternatively, [Bazel](https://bazel.build) is also supported as a build system
+(credits to [zaucy](https://github.com/zaucy) who offered to maintain it).<br/>
+In the documentation below I'll still refer to `CMake`, this being the official
+build system of the library.
+
+## CMake
+
+To use `EnTT` from a `CMake` project, just link an existing target to the
+`EnTT::EnTT` alias.<br/>
+The library offers everything you need for locating (as in `find_package`),
+embedding (as in `add_subdirectory`), fetching (as in `FetchContent`) or using
+it in many of the ways that you can think of and that involve `CMake`.<br/>
+Covering all possible cases would require a treaty and not a simple README file,
+but I'm confident that anyone reading this section also knows what it's about
+and can use `EnTT` from a `CMake` project without problems.
+
+## Natvis support
+
+When using `CMake`, just enable the option `ENTT_INCLUDE_NATVIS` and enjoy
+it.<br/>
+Otherwise, most of the tools are covered via Natvis and all files can be found
+in the `natvis` directory, divided by module.<br/>
+If you spot errors or have suggestions, any contribution is welcome!
+
+## Packaging Tools
+
+`EnTT` is available for some of the most known packaging tools. In particular:
+
+* [`Conan`](https://github.com/conan-io/conan-center-index), the C/C++ Package
+  Manager for Developers.
+
+* [`vcpkg`](https://github.com/Microsoft/vcpkg), Microsoft VC++ Packaging
+  Tool.<br/>
+  You can download and install `EnTT` in just a few simple steps:
+
+  ```
+  $ git clone https://github.com/Microsoft/vcpkg.git
+  $ cd vcpkg
+  $ ./bootstrap-vcpkg.sh
+  $ ./vcpkg integrate install
+  $ vcpkg install entt
+  ```
+
+  Or you can use the `experimental` feature to test the latest changes:
+
+  ```
+  vcpkg install entt[experimental] --head
+  ```
+
+  The `EnTT` port in `vcpkg` is kept up to date by Microsoft team members and
+  community contributors.<br/>
+  If the version is out of date, please
+  [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the
+  `vcpkg` repository.
+
+* [`Homebrew`](https://github.com/skypjack/homebrew-entt), the missing package
+  manager for macOS.<br/>
+  Available as a homebrew formula. Just type the following to install it:
+
+  ```
+  brew install skypjack/entt/entt
+  ```
+
+* [`build2`](https://build2.org), build toolchain for developing and packaging C
+  and C++ code.<br/>
+  In order to use the [`entt`](https://cppget.org/entt) package in a `build2`
+  project, add the following line or a similar one to the `manifest` file:
+
+  ```
+  depends: entt ^3.0.0
+  ```
+
+  Also check that the configuration refers to a valid repository, so that the
+  package can be found by `build2`:
+
+  * [`cppget.org`](https://cppget.org), the open-source community central
+    repository, accessible as `https://pkg.cppget.org/1/stable`.
+
+  * [Package source repository](https://github.com/build2-packaging/entt):
+    accessible as either `https://github.com/build2-packaging/entt.git` or
+    `ssh://git@github.com/build2-packaging/entt.git`.
+    Feel free to [report issues](https://github.com/build2-packaging/entt) with
+    this package.
+
+  Both can be used with `bpkg add-repo` or added in a project
+  `repositories.manifest`. See the official
+  [documentation](https://build2.org/build2-toolchain/doc/build2-toolchain-intro.xhtml#guide-repositories)
+  for more details.
+
+Consider this list a work in progress and help me to make it longer if you like.
+
+## pkg-config
+
+`EnTT` also supports `pkg-config` (for some definition of _supports_ at least).
+A suitable file called `entt.pc` is generated and installed in a proper
+directory when running `CMake`.<br/>
+This should also make it easier to use with tools such as `Meson` or similar.
+
+# Documentation
+
+The documentation is based on [doxygen](http://www.doxygen.nl/). To build it:
+
+    $ cd build
+    $ cmake .. -DENTT_BUILD_DOCS=ON
+    $ make
+
+The API reference will be created in HTML format within the directory
+`build/docs/html`. To navigate it with your favorite browser:
+
+    $ cd build
+    $ your_favorite_browser docs/html/index.html
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+The same version is also available [online](https://skypjack.github.io/entt/)
+for the latest release, that is the last stable tag. If you are looking for
+something more pleasing to the eye, consider reading the nice-looking version
+available on [docsforge](https://entt.docsforge.com/): same documentation, much
+more pleasant to read.<br/>
+Moreover, there exists a [wiki](https://github.com/skypjack/entt/wiki) dedicated
+to the project where users can find all related documentation pages.
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Tests
+
+To compile and run the tests, `EnTT` requires *googletest*.<br/>
+`cmake` will download and compile the library before compiling anything else.
+In order to build the tests, set the `CMake` option `ENTT_BUILD_TESTING` to
+`ON`.
+
+To build the most basic set of tests:
+
+* `$ cd build`
+* `$ cmake -DENTT_BUILD_TESTING=ON ..`
+* `$ make`
+* `$ make test`
+
+Note that benchmarks are not part of this set.
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# EnTT in Action
+
+`EnTT` is widely used in private and commercial applications. I cannot even
+mention most of them because of some signatures I put on some documents time
+ago. Fortunately, there are also people who took the time to implement open
+source projects based on `EnTT` and did not hold back when it came to
+documenting them.
+
+[Here](https://github.com/skypjack/entt/wiki/EnTT-in-Action) you can find an
+incomplete list of games, applications and articles that can be used as a
+reference.
+
+If you know of other resources out there that are about `EnTT`, feel free to
+open an issue or a PR and I'll be glad to add them to the list.
+
+# Contributors
+
+Requests for features, PRs, suggestions ad feedback are highly appreciated.
+
+If you find you can help and want to contribute to the project with your
+experience or you do want to get part of the project for some other reason, feel
+free to contact me directly (you can find the mail in the
+[profile](https://github.com/skypjack)).<br/>
+I can't promise that each and every contribution will be accepted, but I can
+assure that I'll do my best to take them all as soon as possible.
+
+If you decide to participate, please see the guidelines for
+[contributing](CONTRIBUTING.md) before to create issues or pull
+requests.<br/>
+Take also a look at the
+[contributors list](https://github.com/skypjack/entt/blob/master/AUTHORS) to
+know who has participated so far.
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# License
+
+Code and documentation Copyright (c) 2017-2022 Michele Caini.<br/>
+Colorful logo Copyright (c) 2018-2021 Richard Caseres.
+
+Code released under
+[the MIT license](https://github.com/skypjack/entt/blob/master/LICENSE).<br/>
+Documentation released under
+[CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).<br/>
+All logos released under
+[CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).

external/entt/entt/TODO

@@ -0,0 +1,27 @@
+* debugging tools (#60): the issue online already contains interesting tips on this, look at it
+* work stealing job system (see #100) + mt scheduler based on const awareness for types
+
+EXAMPLES
+* filter on runtime values/variables (not only types)
+* support to polymorphic types (see #859)
+
+DOC:
+* storage<void>
+* custom storage/view
+* examples (and credits) from @alanjfs :)
+* update entity doc when the storage based model is in place
+
+TODO (high prio):
+* remove the static storage from the const assure in the registry
+
+WIP:
+* get rid of observers, storage based views made them pointless - document alternatives
+* add storage getter for filters to views and groups
+* exploit the tombstone mechanism to allow enabling/disabling entities (see bump, compact and clear for further details)
+* basic_storage::bind for cross-registry setups (see and remove todo from entity_copy.cpp)
+* process scheduler: reviews, use free lists internally
+* dedicated entity storage, in-place O(1) release/destroy for non-orphaned entities, out-of-sync model
+* entity-only and exclude-only views (both solved with entity storage and storage<void>)
+* custom allocators all over (registry, ...)
+* add test for maximum number of entities reached
+* deprecate non-owning groups in favor of owning views and view packs, introduce lazy owning views

external/entt/entt/WORKSPACE

@@ -0,0 +1 @@
+workspace(name = "com_github_skypjack_entt")

external/entt/entt/build/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

external/entt/entt/cmake/in/EnTTConfig.cmake.in

@@ -0,0 +1,5 @@
+@PACKAGE_INIT@
+
+set(EnTT_VERSION "@PROJECT_VERSION@")
+include("${CMAKE_CURRENT_LIST_DIR}/EnTTTargets.cmake")
+check_required_components("@PROJECT_NAME@")

external/entt/entt/cmake/in/entt.pc.in

@@ -0,0 +1,8 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=@EnTT_PKGCONFIG_INCLUDEDIR@
+
+Name: EnTT
+Description: Gaming meets modern C++
+Url: https://github.com/skypjack/entt
+Version: @ENTT_VERSION@
+Cflags: -I${includedir}

external/entt/entt/cmake/modules/JoinPaths.cmake

@@ -0,0 +1,23 @@
+# This module provides function for joining paths
+# known from most languages
+#
+# SPDX-License-Identifier: (MIT OR CC0-1.0)
+# Copyright 2020 Jan Tojnar
+# https://github.com/jtojnar/cmake-snips
+#
+# Modelled after Python<6F>s os.path.join
+# https://docs.python.org/3.7/library/os.path.html#os.path.join
+# Windows not supported
+function(join_paths joined_path first_path_segment)
+    set(temp_path "${first_path_segment}")
+    foreach(current_segment IN LISTS ARGN)
+        if(NOT ("${current_segment}" STREQUAL ""))
+            if(IS_ABSOLUTE "${current_segment}")
+                set(temp_path "${current_segment}")
+            else()
+                set(temp_path "${temp_path}/${current_segment}")
+            endif()
+        endif()
+    endforeach()
+    set(${joined_path} "${temp_path}" PARENT_SCOPE)
+endfunction()

external/entt/entt/conan/build.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from cpt.packager import ConanMultiPackager
+import os
+
+if __name__ == "__main__":
+    username = os.getenv("GITHUB_ACTOR")
+    tag_version = os.getenv("GITHUB_REF")
+    tag_package = os.getenv("GITHUB_REPOSITORY")
+    login_username = os.getenv("CONAN_LOGIN_USERNAME")
+    package_version = tag_version.replace("refs/tags/v", "")
+    package_name = tag_package.replace("skypjack/", "")
+    reference = "{}/{}".format(package_name, package_version)
+    channel = os.getenv("CONAN_CHANNEL", "stable")
+    upload = os.getenv("CONAN_UPLOAD")
+    stable_branch_pattern = os.getenv("CONAN_STABLE_BRANCH_PATTERN", r"v\d+\.\d+\.\d+.*")
+    test_folder = os.getenv("CPT_TEST_FOLDER", os.path.join("conan", "test_package"))
+    upload_only_when_stable = os.getenv("CONAN_UPLOAD_ONLY_WHEN_STABLE", True)
+    disable_shared = os.getenv("CONAN_DISABLE_SHARED_BUILD", "False")
+
+    builder = ConanMultiPackager(username=username,
+                                 reference=reference,
+                                 channel=channel,
+                                 login_username=login_username,
+                                 upload=upload,
+                                 stable_branch_pattern=stable_branch_pattern,
+                                 upload_only_when_stable=upload_only_when_stable,
+                                 test_folder=test_folder)
+    builder.add()
+
+    filtered_builds = []
+    for settings, options, env_vars, build_requires, reference in builder.items:
+        if disable_shared == "False" or not options["{}:shared".format(package_name)]:
+             filtered_builds.append([settings, options, env_vars, build_requires])
+    builder.builds = filtered_builds
+
+    builder.run()

external/entt/entt/conan/ci/build.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -e
+set -x
+
+conan user
+python conan/build.py

external/entt/entt/conan/ci/install.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -e
+set -x
+
+pip install -U conan_package_tools conan

external/entt/entt/conan/test_package/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.7.2)
+project(test_package)
+
+set(CMAKE_VERBOSE_MAKEFILE TRUE)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+add_executable(${PROJECT_NAME} test_package.cpp)
+target_link_libraries(${PROJECT_NAME} ${CONAN_LIBS})

external/entt/entt/conan/test_package/conanfile.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from conans import ConanFile, CMake
+import os
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "cmake"
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        bin_path = os.path.join("bin", "test_package")
+        self.run(bin_path, run_environment=True)

external/entt/entt/conan/test_package/test_package.cpp

@@ -0,0 +1,56 @@
+#include <entt/entt.hpp>
+#include <cstdint>
+
+struct position {
+    float x;
+    float y;
+};
+
+struct velocity {
+    float dx;
+    float dy;
+};
+
+void update(entt::registry &registry) {
+    auto view = registry.view<position, velocity>();
+
+    for(auto entity: view) {
+        // gets only the components that are going to be used ...
+
+        auto &vel = view.get<velocity>(entity);
+
+        vel.dx = 0.;
+        vel.dy = 0.;
+
+        // ...
+    }
+}
+
+void update(std::uint64_t dt, entt::registry &registry) {
+    registry.view<position, velocity>().each([dt](auto &pos, auto &vel) {
+        // gets all the components of the view at once ...
+
+        pos.x += vel.dx * dt;
+        pos.y += vel.dy * dt;
+
+        // ...
+    });
+}
+
+int main() {
+    entt::registry registry;
+    std::uint64_t dt = 16;
+
+    for(auto i = 0; i < 10; ++i) {
+        auto entity = registry.create();
+        registry.emplace<position>(entity, i * 1.f, i * 1.f);
+        if(i % 2 == 0) { registry.emplace<velocity>(entity, i * .1f, i * .1f); }
+    }
+
+    update(dt, registry);
+    update(registry);
+
+    // ...
+
+    return EXIT_SUCCESS;
+}

external/entt/entt/conanfile.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from conans import ConanFile
+
+
+class EnttConan(ConanFile):
+    name = "entt"
+    description = "Gaming meets modern C++ - a fast and reliable entity-component system (ECS) and much more "
+    topics = ("conan," "entt", "gaming", "entity", "ecs")
+    url = "https://github.com/skypjack/entt"
+    homepage = url
+    author = "Michele Caini <michele.caini@gmail.com>"
+    license = "MIT"
+    exports = ["LICENSE"]
+    exports_sources = ["src/*"]
+    no_copy_source = True
+
+    def package(self):
+        self.copy(pattern="LICENSE", dst="licenses")
+        self.copy(pattern="*", dst="include", src="src", keep_path=True)
+
+    def package_info(self):
+        if not self.in_local_cache:
+            self.cpp_info.includedirs = ["src"]
+
+    def package_id(self):
+        self.info.header_only()

external/entt/entt/docs/CMakeLists.txt

@@ -0,0 +1,40 @@
+#
+# Doxygen configuration (documentation)
+#
+
+set(DOXY_DEPS_DIRECTORY ${EnTT_SOURCE_DIR}/deps)
+set(DOXY_SOURCE_DIRECTORY ${EnTT_SOURCE_DIR}/src)
+set(DOXY_DOCS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+set(DOXY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
+configure_file(doxy.in doxy.cfg @ONLY)
+
+add_custom_target(
+    docs ALL
+    COMMAND ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/doxy.cfg
+    WORKING_DIRECTORY ${EnTT_SOURCE_DIR}
+    VERBATIM
+    SOURCES
+        dox/extra.dox
+        md/config.md
+        md/container.md
+        md/core.md
+        md/entity.md
+        md/faq.md
+        md/lib.md
+        md/links.md
+        md/locator.md
+        md/meta.md
+        md/poly.md
+        md/process.md
+        md/reference.md
+        md/resource.md
+        md/signal.md
+        md/unreal.md
+        doxy.in
+)
+
+install(
+    DIRECTORY ${DOXY_OUTPUT_DIRECTORY}/html
+    DESTINATION share/${PROJECT_NAME}-${PROJECT_VERSION}/
+)

external/entt/entt/docs/dox/extra.dox

@@ -0,0 +1,5 @@
+/**
+ * @namespace entt
+ *
+ * @brief `EnTT` default namespace.
+ */

external/entt/entt/docs/md/config.md

@@ -0,0 +1,121 @@
+# Crash Course: configuration
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Definitions](#definitions)
+  * [ENTT_NOEXCEPTION](#entt_noexception)
+  * [ENTT_USE_ATOMIC](#entt_use_atomic)
+  * [ENTT_ID_TYPE](#entt_id_type)
+  * [ENTT_SPARSE_PAGE](#entt_sparse_page)
+  * [ENTT_PACKED_PAGE](#entt_packed_page)
+  * [ENTT_ASSERT](#entt_assert)
+    * [ENTT_ASSERT_CONSTEXPR](#entt_assert_constexpr)
+    * [ENTT_DISABLE_ASSERT](#entt_disable_assert)
+  * [ENTT_NO_ETO](#entt_no_eto)
+  * [ENTT_STANDARD_CPP](#entt_standard_cpp)
+
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+`EnTT` has become almost completely customizable over time, in many
+respects. These variables are just one of the many ways to customize how it
+works.<br/>
+In the vast majority of cases, users will have no interest in changing the
+default parameters. For all other cases, the list of possible configurations
+with which it's possible to adjust the behavior of the library at runtime can be
+found below.
+
+# Definitions
+
+All options are intended as parameters to the compiler (or user-defined macros
+within the compilation units, if preferred).<br/>
+Each parameter can result in internal library definitions. It's not recommended
+to try to also modify these definitions, since there is no guarantee that they
+will remain stable over time unlike the options below.
+
+## ENTT_NOEXCEPTION
+
+Define this variable without assigning any value to it to turn off exception
+handling in `EnTT`.<br/>
+This is roughly equivalent to setting the compiler flag `-fno-exceptions` but is
+also limited to this library only.
+
+## ENTT_USE_ATOMIC
+
+In general, `EnTT` doesn't offer primitives to support multi-threading. Many of
+the features can be split over multiple threads without any explicit control and
+the user is the one who knows if a synchronization point is required.<br/>
+However, some features aren't easily accessible to users and are made
+thread-safe by means of this definition.
+
+## ENTT_ID_TYPE
+
+`entt::id_type` is directly controlled by this definition and widely used within
+the library.<br/>
+By default, its type is `std::uint32_t`. However, users can define a different
+default type if necessary.
+
+## ENTT_SPARSE_PAGE
+
+It's known that the ECS module of `EnTT` is based on _sparse sets_. What is less
+known perhaps is that the sparse arrays are paged to reduce memory usage.<br/>
+Default size of pages (that is, the number of elements they contain) is 4096 but
+users can adjust it if appropriate. In all case, the chosen value **must** be a
+power of 2.
+
+## ENTT_PACKED_PAGE
+
+As it happens with sparse arrays, packed arrays are also paginated. However, in
+this case the aim isn't to reduce memory usage but to have pointer stability
+upon component creation.<br/>
+Default size of pages (that is, the number of elements they contain) is 1024 but
+users can adjust it if appropriate. In all case, the chosen value **must** be a
+power of 2.
+
+## ENTT_ASSERT
+
+For performance reasons, `EnTT` doesn't use exceptions or any other control
+structures. In fact, it offers many features that result in undefined behavior
+if not used correctly.<br/>
+To get around this, the library relies on a lot of asserts for the purpose of
+detecting errors in debug builds. By default, it uses `assert` internally. Users
+are allowed to overwrite its behavior by setting this variable.
+
+### ENTT_ASSERT_CONSTEXPR
+
+Usually, an assert within a `constexpr` function isn't a big deal. However, in
+case of extreme customizations, it might be useful to differentiate.<br/>
+For this purpose, `EnTT` introduces an admittedly badly named variable to make
+the job easier in this regard. By default, this variable forwards its arguments
+to `ENTT_ASSERT`.
+
+### ENTT_DISABLE_ASSERT
+
+Assertions may in turn affect performance to an extent when enabled. Whether
+`ENTT_ASSERT` and `ENTT_ASSERT_CONSTEXPR` are redefined or not, all asserts can
+be disabled at once by means of this definition.<br/>
+Note that `ENTT_DISABLE_ASSERT` takes precedence over the redefinition of the
+other variables and is therefore meant to disable all controls no matter what.
+
+## ENTT_NO_ETO
+
+In order to reduce memory consumption and increase performance, empty types are
+never instantiated nor stored by the ECS module of `EnTT`.<br/>
+Use this variable to treat these types like all others and therefore to create a
+dedicated storage for them.
+
+## ENTT_STANDARD_CPP
+
+`EnTT` mixes non-standard language features with others that are perfectly
+compliant to offer some of its functionalities.<br/>
+This definition prevents the library from using non-standard techniques, that
+is, functionalities that aren't fully compliant with the standard C++.<br/>
+While there are no known portability issues at the time of this writing, this
+should make the library fully portable anyway if needed.

external/entt/entt/docs/md/container.md

@@ -0,0 +1,67 @@
+# Crash Course: containers
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Containers](#containers)
+  * [Dense map](#dense-map)
+  * [Dense set](#dense-set)
+
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+The standard C++ library offers a wide range of containers and it's really
+difficult to do better (although it's very easy to do worse, as many examples
+available online demonstrate).<br/>
+`EnTT` doesn't try in any way to replace what is offered by the standard. Quite
+the opposite, given the widespread use that is made of standard containers.<br/>
+However, the library also tries to fill a gap in features and functionality by
+making available some containers initially developed for internal use.
+
+This section of the library is likely to grow larger over time. However, for the
+moment it's quite small and mainly aimed at satisfying some internal needs.<br/>
+For all containers made available, full test coverage and stability over time is
+guaranteed as usual.
+
+# Containers
+
+## Dense map
+
+The dense map made available in `EnTT` is a hash map that aims to return a
+packed array of elements, so as to reduce the number of jumps in memory during
+iterations.<br/>
+The implementation is based on _sparse sets_ and each bucket is identified by an
+implicit list within the packed array itself.
+
+The interface is very close to its counterpart in the standard library, that is,
+`std::unordered_map`.<br/>
+However, both local and non-local iterators returned by a dense map belong to
+the input iterator category although they respectively model the concepts of a
+_forward iterator_ type and a _random access iterator_ type.<br/>
+This is because they return a pair of references rather than a reference to a
+pair. In other words, dense maps return a so called _proxy iterator_ the value
+type of which is:
+
+* `std::pair<const Key &, Type &>` for non-const iterator types.
+* `std::pair<const Key &, const Type &>` for const iterator types.
+
+This is quite different from what any standard library map returns and should be
+taken into account when looking for a drop-in replacement.
+
+## Dense set
+
+The dense set made available in `EnTT` is a hash set that aims to return a
+packed array of elements, so as to reduce the number of jumps in memory during
+iterations.<br/>
+The implementation is based on _sparse sets_ and each bucket is identified by an
+implicit list within the packed array itself.
+
+The interface is in all respects similar to its counterpart in the standard
+library, that is, `std::unordered_set`.<br/>
+Therefore, there is no need to go into the API description.

external/entt/entt/docs/md/faq.md

@@ -0,0 +1,215 @@
+# Frequently Asked Questions
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [FAQ](#faq)
+  * [Why is my debug build on Windows so slow?](#why-is-my-debug-build-on-windows-so-slow)
+  * [How can I represent hierarchies with my components?](#how-can-i-represent-hierarchies-with-my-components)
+  * [Custom entity identifiers: yay or nay?](#custom-entity-identifiers-yay-or-nay)
+  * [Warning C4307: integral constant overflow](#warning-C4307-integral-constant-overflow)
+  * [Warning C4003: the min, the max and the macro](#warning-C4003-the-min-the-max-and-the-macro)
+  * [The standard and the non-copyable types](#the-standard-and-the-non-copyable-types)
+  * [Which functions trigger which signals](#which-functions-trigger-which-signals)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+This is a constantly updated section where I'm trying to put the answers to the
+most frequently asked questions.<br/>
+If you don't find your answer here, there are two cases: nobody has done it yet
+or this section needs updating. In both cases, you can
+[open a new issue](https://github.com/skypjack/entt/issues/new) or enter either
+the [gitter channel](https://gitter.im/skypjack/entt) or the
+[discord server](https://discord.gg/5BjPWBd) to ask for help.<br/>
+Probably someone already has an answer for you and we can then integrate this
+part of the documentation.
+
+# FAQ
+
+## Why is my debug build on Windows so slow?
+
+`EnTT` is an experimental project that I also use to keep me up-to-date with the
+latest revision of the language and the standard library. For this reason, it's
+likely that some classes you're working with are using standard containers under
+the hood.<br/>
+Unfortunately, it's known that the standard containers aren't particularly
+performing in debugging (the reasons for this go beyond this document) and are
+even less so on Windows apparently. Fortunately this can also be mitigated a
+lot, achieving good results in many cases.
+
+First of all, there are two things to do in a Windows project:
+
+* Disable the [`/JMC`](https://docs.microsoft.com/cpp/build/reference/jmc)
+  option (_Just My Code_ debugging), available starting with Visual Studio 2017
+  version 15.8.
+
+* Set the [`_ITERATOR_DEBUG_LEVEL`](https://docs.microsoft.com/cpp/standard-library/iterator-debug-level)
+  macro to 0. This will disable checked iterators and iterator debugging.
+
+Moreover, set the `ENTT_DISABLE_ASSERT` variable or redefine the `ENTT_ASSERT`
+macro to disable internal debug checks in `EnTT`:
+
+```cpp
+#define ENTT_ASSERT(...) ((void)0)
+```
+
+These asserts are introduced to help the users but they require to access to the
+underlying containers and therefore risk ruining the performance in some cases.
+
+With these changes, debug performance should increase enough in most cases. If
+you want something more, you can also switch to an optimization level `O0` or
+preferably `O1`.
+
+## How can I represent hierarchies with my components?
+
+This is one of the first questions that anyone makes when starting to work with
+the entity-component-system architectural pattern.<br/>
+There are several approaches to the problem and the best one depends mainly on
+the real problem one is facing. In all cases, how to do it doesn't strictly
+depend on the library in use, but the latter certainly allows or not different
+techniques depending on how the data are laid out.
+
+I tried to describe some of the approaches that fit well with the model of
+`EnTT`. [This](https://skypjack.github.io/2019-06-25-ecs-baf-part-4/) is the
+first post of a series that tries to _explore_ the problem. More will probably
+come in future.<br/>
+In addition, `EnTT` also offers the possibility to create stable storage types
+and therefore have pointer stability for one, all or some components. This is by
+far the most convenient solution when it comes to creating hierarchies and
+whatnot. See the documentation for the ECS part of the library and in particular
+what concerns the `component_traits` class for further details.
+
+## Custom entity identifiers: yay or nay?
+
+Custom entity identifiers are definitely a good idea in two cases at least:
+
+* If `std::uint32_t` isn't large enough for your purposes, since this is the
+  underlying type of `entt::entity`.
+
+* If you want to avoid conflicts when using multiple registries.
+
+Identifiers can be defined through enum classes and class types that define an
+`entity_type` member of type `std::uint32_t` or `std::uint64_t`.<br/>
+In fact, this is a definition equivalent to that of `entt::entity`:
+
+```cpp
+enum class entity: std::uint32_t {};
+```
+
+There is no limit to the number of identifiers that can be defined.
+
+## Warning C4307: integral constant overflow
+
+According to [this](https://github.com/skypjack/entt/issues/121) issue, using a
+hashed string under VS (toolset v141) could generate a warning.<br/>
+First of all, I want to reassure you: it's expected and harmless. However, it
+can be annoying.
+
+To suppress it and if you don't want to suppress all the other warnings as well,
+here is a workaround in the form of a macro:
+
+```cpp
+#if defined(_MSC_VER)
+#define HS(str) __pragma(warning(suppress:4307)) entt::hashed_string{str}
+#else
+#define HS(str) entt::hashed_string{str}
+#endif
+```
+
+With an example of use included:
+
+```cpp
+constexpr auto identifier = HS("my/resource/identifier");
+```
+
+Thanks to [huwpascoe](https://github.com/huwpascoe) for the courtesy.
+
+## Warning C4003: the min, the max and the macro
+
+On Windows, a header file defines two macros `min` and `max` which may result in
+conflicts with their counterparts in the standard library and therefore in
+errors during compilation.
+
+It's a pretty big problem but fortunately it's not a problem of `EnTT` and there
+is a fairly simple solution to it.<br/>
+It consists in defining the `NOMINMAX` macro before including any other header
+so as to get rid of the extra definitions:
+
+```cpp
+#define NOMINMAX
+```
+
+Please refer to [this](https://github.com/skypjack/entt/issues/96) issue for
+more details.
+
+## The standard and the non-copyable types
+
+`EnTT` uses internally the trait `std::is_copy_constructible_v` to check if a
+component is actually copyable. However, this trait doesn't really check whether
+a type is actually copyable. Instead, it just checks that a suitable copy
+constructor and copy operator exist.<br/>
+This can lead to surprising results due to some idiosyncrasies of the standard.
+
+For example, `std::vector` defines a copy constructor that is conditionally
+enabled depending on whether the value type is copyable or not. As a result,
+`std::is_copy_constructible_v` returns true for the following specialization:
+
+```cpp
+struct type {
+    std::vector<std::unique_ptr<action>> vec;
+};
+```
+
+However, the copy constructor is effectively disabled upon specialization.
+Therefore, trying to assign an instance of this type to an entity may trigger a
+compilation error.<br/>
+As a workaround, users can mark the type explicitly as non-copyable. This also
+suppresses the implicit generation of the move constructor and operator, which
+will therefore have to be defaulted accordingly:
+
+```cpp
+struct type {
+    type(const type &) = delete;
+    type(type &&) = default;
+
+    type & operator=(const type &) = delete;
+    type & operator=(type &&) = default;
+
+    std::vector<std::unique_ptr<action>> vec;
+};
+```
+
+Note that aggregate initialization is also disabled as a consequence.<br/>
+Fortunately, this type of trick is quite rare. The bad news is that there is no
+way to deal with it at the library level, this being due to the design of the
+language. On the other hand, the fact that the language itself also offers a way
+to mitigate the problem makes it manageable.
+
+## Which functions trigger which signals
+
+The `registry` class offers three signals that are emitted following specific
+operations. Maybe not everyone knows what these operations are, though.<br/>
+If this isn't clear, below you can find a _vademecum_ for this purpose:
+
+* `on_created` is invoked when a component is first added (neither modified nor 
+  replaced) to an entity.
+
+* `on_update` is called whenever an existing component is modified or replaced.
+
+* `on_destroyed` is called when a component is explicitly or implicitly removed 
+  from an entity.
+
+Among the most controversial functions can be found `emplace_or_replace` and
+`destroy`. However, following the above rules, it's quite simple to know what 
+will happen.<br/>
+In the first case, `on_created` is invoked if the entity has not the component,
+otherwise the latter is replaced and therefore `on_update` is triggered. As for
+the second case, components are removed from their entities and thus freed when
+they are recycled. It means that `on_destroyed` is triggered for every component 
+owned by the entity that is destroyed.

external/entt/entt/docs/md/graph.md

@@ -0,0 +1,299 @@
+# Crash Course: graph
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Data structures](#data-structures)
+  * [Adjacency matrix](#adjacency-matrix)
+  * [Graphviz dot language](#graphviz-dot-language)
+* [Flow builder](#flow-builder)
+  * [Tasks and resources](#tasks-and-resources)
+  * [Fake resources and order of execution](#fake-resources-and-order-of-execution)
+  * [Sync points](#sync-points)
+  * [Execution graph](#execution-graph)
+
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+`EnTT` doesn't aim to offer everything one needs to work with graphs. Therefore,
+anyone looking for this in the _graph_ submodule will be disappointed.<br/>
+Quite the opposite is true. This submodule is minimal and contains only the data
+structures and algorithms strictly necessary for the development of some tools
+such as the _flow builder_.
+
+# Data structures
+
+As anticipated in the introduction, the aim isn't to offer all possible data
+structures suitable for representing and working with graphs. Many will likely
+be added or refined over time, however I want to discourage anyone expecting
+tight scheduling on the subject.<br/>
+The data structures presented in this section are mainly useful for the
+development and support of some tools which are also part of the same submodule.
+
+## Adjacency matrix
+
+The adjacency matrix is designed to represent either a directed or an undirected
+graph:
+
+```cpp
+entt::adjacency_matrix<entt::directed_tag> adjacency_matrix{};
+```
+
+The `directed_tag` type _creates_ the graph as directed. There is also an
+`undirected_tag` counterpart which creates it as undirected.<br/>
+The interface deviates slightly from the typical double indexing of C and offers
+an API that is perhaps more familiar to a C++ programmer. Therefore, the access
+and modification of an element will take place via the `contains`, `insert` and
+`erase` functions rather than a double call to an `operator[]`:
+
+```cpp
+if(adjacency_matrix.contains(0u, 1u)) {
+    adjacency_matrix.erase(0u, 1u);
+} else {
+    adjacency_matrix.insert(0u, 1u);
+}
+```
+
+Both `insert` and` erase` are idempotent functions which have no effect if the
+element already exists or has already been deleted.<br/>
+The first one returns an `std::pair` containing the iterator to the element and
+a boolean value indicating whether the element has been inserted or was already
+present. The second one instead returns the number of deleted elements (0 or 1).
+
+An adjacency matrix must be initialized with the number of elements (vertices)
+when constructing it but can also be resized later using the `resize` function:
+
+```cpp
+entt::adjacency_matrix<entt::directed_tag> adjacency_matrix{3u};
+```
+
+To visit all vertices, the class offers a function named `vertices` that returns
+an iterable object suitable for the purpose:
+
+```cpp
+for(auto &&vertex: adjacency_matrix.vertices()) {
+    // ...
+}
+```
+
+Note that the same result can be obtained with the following snippet, since the
+vertices are unsigned integral values:
+
+```cpp
+for(auto last = adjacency_matrix.size(), pos = {}; pos < last; ++pos) {
+    // ...
+}
+```
+
+As for visiting the edges, a few functions are available.<br/>
+When the purpose is to visit all the edges of a given adjacency matrix, the
+`edges` function returns an iterable object that can be used to get them as
+pairs of vertices:
+
+```cpp
+for(auto [lhs, rhs]: adjacency_matrix.edges()) {
+    // ...
+}
+```
+
+On the other hand, if the goal is to visit all the in- or out-edges of a given
+vertex, the `in_edges` and `out_edges` functions are meant for that:
+
+```cpp
+for(auto [lhs, rhs]: adjacency_matrix.out_edges(3u)) {
+    // ...
+}
+```
+
+As might be expected, these functions expect the vertex to visit (that is, to
+return the in- or out-edges for) as an argument.<br/>
+Finally, the adjacency matrix is an allocator-aware container and offers most of
+the functionality one would expect from this type of containers, such as `clear`
+or 'get_allocator` and so on.
+
+## Graphviz dot language
+
+As it's one of the most popular formats, the library offers minimal support for
+converting a graph to a Graphviz dot snippet.<br/>
+The simplest way is to pass both an output stream and a graph to the `dot`
+function:
+
+```cpp
+std::ostringstream output{};
+entt::dot(output, adjacency_matrix);
+```
+
+However, there is also the option of providing a callback to which the vertices
+are passed and which can be used to add (`dot`) properties to the output from
+time to time:
+
+```cpp
+std::ostringstream output{};
+entt::dot(output, adjacency_matrix, [](auto &output, auto vertex) {
+    out << "label=\"v\"" << vertex << ",shape=\"box\"";
+});
+```
+
+This second mode is particularly convenient when the user wants to associate
+data managed externally to the graph being converted.
+
+# Flow builder
+
+A flow builder is used to create execution graphs from tasks and resources.<br/>
+The implementation is as generic as possible and doesn't bind to any other part
+of the library.
+
+This class is designed as a sort of _state machine_ to which a specific task is
+attached for which the resources accessed in read-only or read-write mode are
+specified.<br/>
+Most of the functions in the API also return the flow builder itself, according
+to what is the common sense API when it comes to builder classes.
+
+Once all tasks have been registered and resources assigned to them, an execution
+graph in the form of an adjacency matrix is returned to the user.<br/>
+This graph contains all the tasks assigned to the flow builder in the form of
+_vertices_. The _vertex_ itself can be used as an index to get the identifier
+passed during registration.
+
+## Tasks and resources
+
+Although these terms are used extensively in the documentation, the flow builder
+has no real concept of tasks and resources.<br/>
+This class works mainly with _identifiers_, that is, values of type `id_type`.
+That is, both tasks and resources are identified by integral values.<br/>
+This allows not to couple the class itself to the rest of the library or to any
+particular data structure. On the other hand, it requires the user to keep track
+of the association between identifiers and operations or actual data.
+
+Once a flow builder has been created (which requires no constructor arguments),
+the first thing to do is to bind a task. This will indicate to the builder who
+intends to consume the resources that will be specified immediately after:
+
+```cpp
+entt::flow builder{};
+builder.bind("task_1"_hs);
+```
+
+Note that the example uses the `EnTT` hashed string to generate an identifier
+for the task.<br/>
+Indeed, the use of `id_type` as an identifier type is not by accident. In fact,
+it matches well with the internal hashed string class. Moreover, it's also the
+same type returned by the hash function of the internal RTTI system, in case the
+user wants to rely on that.<br/>
+However, being an integral value, it leaves the user full freedom to rely on his
+own tools if he deems it necessary.
+
+Once a task has been associated with the flow builder, it can be assigned
+read-only or read-write resources, as appropriate:
+
+```cpp
+builder
+    .bind("task_1"_hs)
+        .ro("resource_1"_hs)
+        .ro("resource_2"_hs)
+    .bind("task_2"_hs)
+        .rw("resource_2"_hs)
+```
+
+As mentioned, many functions return the builder itself and it's therefore easy
+to concatenate the different calls.<br/>
+Also in the case of resources, these are identified by numeric values of type
+`id_type`. As above, the choice is not entirely random. This goes well with the
+tools offered by the library while leaving room for maximum flexibility.
+
+Finally, both the `ro` and` rw` functions also offer an overload that accepts a
+pair of iterators, so that one can pass a range of resources in one go.
+
+## Fake resources and order of execution
+
+The flow builder doesn't offer the ability to specify when a task should execute
+before or after another task.<br/>
+In fact, the order of _registration_ on the resources also determines the order
+in which the tasks are processed during the generation of the execution graph.
+
+However, there is a way to force the execution order of two processes.<br/>
+Briefly, since accessing a resource in opposite modes requires sequential rather
+than parallel scheduling, it's possible to make use of fake resources to force
+the order execution:
+
+```cpp
+builder
+    .bind("task_1"_hs)
+        .ro("resource_1"_hs)
+        .rw("fake"_hs)
+    .bind("task_2"_hs)
+        .ro("resource_2"_hs)
+        .ro("fake"_hs)
+    .bind("task_3"_hs)
+        .ro("resource_2"_hs)
+        .ro("fake"_hs)
+```
+
+This snippet forces the execution of `task_2` and `task_3` **after** `task_1`.
+This is due to the fact that the latter sets a read-write requirement on a fake
+resource that the other tasks also want to access in read-only mode.<br/>
+Similarly, it's possible to force a task to run after a certain group:
+
+```cpp
+builder
+    .bind("task_1"_hs)
+        .ro("resource_1"_hs)
+        .ro("fake"_hs)
+    .bind("task_2"_hs)
+        .ro("resource_1"_hs)
+        .ro("fake"_hs)
+    .bind("task_3"_hs)
+        .ro("resource_2"_hs)
+        .rw("fake"_hs)
+```
+
+In this case, since there are a number of processes that want to read a specific
+resource, they will do so in parallel by forcing `task_3` to run after all the
+others tasks.
+
+## Sync points
+
+Sometimes it's useful to assign the role of _sync point_ to a node.<br/>
+Whether it accesses new resources or is simply a watershed, the procedure for
+assigning this role to a vertex is always the same: first it's tied to the flow
+builder, then the `sync` function is invoked:
+
+```cpp
+builder.bind("sync_point"_hs).sync();
+```
+
+The choice to assign an _identity_ to this type of nodes lies in the fact that,
+more often than not, they also perform operations on resources.<br/>
+If this isn't the case, it will still be possible to create no-op vertices to
+which empty tasks are assigned.
+
+## Execution graph
+
+Once both the resources and their consumers have been properly registered, the
+purpose of this tool is to generate an execution graph that takes into account
+all specified constraints to return the best scheduling for the vertices:
+
+```cpp
+entt::adjacency_matrix<entt::directed_tag> graph = builder.graph();
+```
+
+The search for the main vertices, that is those without in-edges, is usually the
+first thing required:
+
+```cpp
+for(auto &&vertex: graph) {
+    if(auto in_edges = graph.in_edges(vertex); in_edges.begin() == in_edges.end()) {
+        // ...
+    }
+}
+```
+
+Starting from them, using the other functions appropriately (such as `out_edges`
+to retrieve the children of a given task or `edges` to access their identifiers)
+it will be possible to instantiate an execution graph.

external/entt/entt/docs/md/lib.md

@@ -0,0 +1,99 @@
+# Push EnTT across boundaries
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Working across boundaries](#working-across-boundaries)
+  * [Smooth until proven otherwise](#smooth-until-proven-otherwise)
+  * [Meta context](#meta-context)
+  * [Memory management](#memory-management)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Working across boundaries
+
+`EnTT` has historically had a limit when used across boundaries on Windows in
+general and on GNU/Linux when default visibility was set to hidden. The
+limitation was mainly due to a custom utility used to assign unique, sequential
+identifiers with different types.<br/>
+Fortunately, nowadays using `EnTT` across boundaries is much easier.
+
+## Smooth until proven otherwise
+
+Many classes in `EnTT` make extensive use of type erasure for their purposes.
+This isn't a problem on itself (in fact, it's the basis of an API so convenient
+to use). However, a way is needed to recognize the objects whose type has been
+erased on the other side of a boundary.<br/>
+The `type_hash` class template is how identifiers are generated and thus made
+available to the rest of the library. In general, this class doesn't arouse much
+interest. The only exception is when a conflict between identifiers occurs
+(definitely uncommon though) or when the default solution proposed by `EnTT`
+isn't suitable for the user's purposes.<br/>
+The section dedicated to `type_info` contains all the details to get around the
+issue in a concise and elegant way. Please refer to the specific documentation.
+
+When working with linked libraries, compile definitions `ENTT_API_EXPORT` and
+`ENTT_API_IMPORT` can be used where there is a need to import or export symbols,
+so as to make everything work nicely across boundaries.<br/>
+On the other hand, everything should run smoothly when working with plugins or
+shared libraries that don't export any symbols.
+
+For anyone who needs more details, the test suite contains multiple examples
+covering the most common cases (see the `lib` directory for all details).<br/>
+It goes without saying that it's impossible to cover **all** possible cases.
+However, what is offered should hopefully serve as a basis for all of them.
+
+## Meta context
+
+The runtime reflection system deserves a special mention when it comes to using
+it across boundaries.<br/>
+Since it's linked already to a static context to which the elements are attached
+and different contexts don't relate to each other, they must be _shared_ to
+allow the use of meta types across boundaries.
+
+Fortunately, sharing a context is also trivial to do. First of all, the local
+one is acquired in the main space:
+
+```cpp
+auto handle = entt::locator<entt::meta_ctx>::handle();
+```
+
+Then, it's passed to the receiving space that sets it as its default context,
+thus discarding or storing aside the local one:
+
+```cpp
+entt::locator<entt::meta_ctx>::reset(handle);
+```
+
+From now on, both spaces refer to the same context and on it are attached all
+new meta types, no matter where they are created.<br/>
+Note that resetting the main context doesn't also propagate changes across
+boundaries. In other words, resetting a context results in the decoupling of the
+two sides and therefore a divergence in the contents.
+
+## Memory Management
+
+There is another subtle problem due to memory management that can lead to
+headaches.<br/>
+It can occur where there are pools of objects (such as components or events)
+dynamically created on demand. This is usually not a problem when working with
+linked libraries that rely on the same dynamic runtime. However, it can occur in
+the case of plugins or statically linked runtimes.
+
+As an example, imagine creating an instance of `registry` in the main executable
+and sharing it with a plugin. If the latter starts working with a component that
+is unknown to the former, a dedicated pool is created within the registry on
+first use.<br/>
+As one can guess, this pool is instantiated on a different side of the boundary
+from the `registry`. Therefore, the instance is now managing memory from
+different spaces and this can quickly lead to crashes if not properly addressed.
+
+To overcome the risk, it's recommended to use well-defined interfaces that make
+fundamental types pass through the boundaries, isolating the instances of the
+`EnTT` classes from time to time and as appropriate.<br/>
+Refer to the test suite for some examples, read the documentation available
+online about this type of issues or consult someone who has already had such
+experiences to avoid problems.

external/entt/entt/docs/md/links.md

@@ -0,0 +1,266 @@
+# EnTT in Action
+
+`EnTT` is widely used in private and commercial applications. I cannot even
+mention most of them because of some signatures I put on some documents time
+ago. Fortunately, there are also people who took the time to implement open
+source projects based on `EnTT` and didn't hold back when it came to documenting
+them.
+
+Below an incomplete list of games, applications and articles that can be used as
+a reference. Where I put the word _apparently_ means that the use of `EnTT` is
+documented but the authors didn't make explicit announcements or contacted me
+directly.
+
+I hope this list can grow much more in the future:
+
+* Games:
+  * [Minecraft](https://minecraft.net/en-us/attribution/) by
+    [Mojang](https://mojang.com/): of course, **that** Minecraft, see the
+    open source attributions page for more details.
+  * [Minecraft Earth](https://www.minecraft.net/en-us/about-earth) by
+    [Mojang](https://mojang.com/): an augmented reality game for mobile, that
+    lets users bring Minecraft into the real world.
+  * [Ember Sword](https://embersword.com/): a modern Free-to-Play MMORPG with a
+    player-driven economy, a classless combat system, and scarce, tradable
+    cosmetic collectibles.
+  * Apparently [Diablo II: Resurrected](https://diablo2.blizzard.com/) by
+    [Blizzard](https://www.blizzard.com/): monsters, heroes, items, spells, all
+    resurrected. Thanks unknown insider.
+  * [Apparently](https://www.youtube.com/watch?v=P8xvOA3ikrQ&t=1105s)
+    [Call of Duty: Vanguard](https://www.callofduty.com/vanguard) by
+    [Sledgehammer Games](https://www.sledgehammergames.com/): I can neither
+    confirm nor deny but there is a license I know in the credits.
+  * Apparently [D&D Dark Alliance](https://darkalliance.wizards.com) by
+    [Wizards of the Coast](https://company.wizards.com): your party, their
+    funeral.
+  * [TiltedOnline](https://github.com/tiltedphoques/TiltedOnline) by
+    [Tilted Phoques](https://github.com/tiltedphoques): Skyrim and Fallout 4 mod
+    to play online.
+  * [Antkeeper](https://github.com/antkeeper/antkeeper-source): an ant colony
+    simulation [game](https://antkeeper.com/).
+  * [Openblack](https://github.com/openblack/openblack): open source
+    reimplementation of the game _Black & White_ (2001).
+  * [Land of the Rair](https://github.com/LandOfTheRair/core2): the new backend
+    of [a retro-style MUD](https://rair.land/) for the new age.
+  * [Face Smash](https://play.google.com/store/apps/details?id=com.gamee.facesmash):
+    a game to play with your face.
+  * [EnTT Pacman](https://github.com/Kerndog73/EnTT-Pacman): an example of how
+    to make Pacman with `EnTT`.
+  * [Wacman](https://github.com/carlfindahl/wacman): a pacman clone with OpenGL.
+  * [Classic Tower Defence](https://github.com/kerndog73/Classic-Tower-Defence):
+    a tiny little tower defence game featuring a homemade font.
+    [Check it out](https://indi-kernick.itch.io/classic-tower-defence).
+  * [The Machine](https://github.com/Kerndog73/The-Machine): a box pushing
+    puzzler with logic gates and other cool stuff.
+    [Check it out](https://indi-kernick.itch.io/the-machine-web-version).
+  * [EnTTPong](https://github.com/DomRe/EnttPong): a basic game made to showcase
+    different parts of `EnTT` and C++17.
+  * [Randballs](https://github.com/gale93/randballs): simple `SFML` and `EnTT`
+    playground.
+  * [EnTT Tower Defense](https://github.com/Daivuk/tddod): a data oriented tower
+    defense example.
+  * [EnTT Breakout](https://github.com/vblanco20-1/entt-breakout): simple
+    example of a breakout game, using `SDL` and `EnTT`.
+  * [Arcade puzzle game with EnTT](https://github.com/MasonRG/ArcadePuzzleGame):
+    arcade puzzle game made in C++ using the `SDL2` and `EnTT` libraries.
+  * [Snake with EnTT](https://github.com/MasonRG/SnakeGame): simple snake game
+    made in C++ with the `SDL2` and `EnTT` libraries.
+  * [Mirrors lasers and robots](https://github.com/guillaume-haerinck/imac-tower-defense):
+    a small tower defense game based on mirror orientation.
+  * [PopHead](https://github.com/SPC-Some-Polish-Coders/PopHead/): 2D, Zombie,
+    RPG game made from scratch in C++.
+  * [Robotligan](https://github.com/Trisslotten/robotligan): multiplayer
+    football game.
+  * [DungeonSlayer](https://github.com/alohaeee/DungeonSlayer): 2D game made
+    from scratch in C++.
+  * [3DGame](https://github.com/kwarkGorny/3DGame): 2.5D top-down space shooter.
+  * [Pulcher](https://github.com/AODQ/pulcher): 2D cross-platform game inspired
+    by Quake.
+  * [Destroid](https://github.com/tyrannicaltoucan/destroid): _one-bazillionth_
+    arcade game about shooting dirty rocks in space, inspired by Asteroids.
+  * [Wanderer](https://github.com/albin-johansson/wanderer): a 2D exploration
+    based indie game.
+  * [Spelunky<EFBFBD> Classic remake](https://github.com/dbeef/spelunky-psp): a truly
+    multiplatform experience with a rewrite from scratch.
+  * [CubbyTower](https://github.com/utilForever/CubbyTower): a simple tower
+    defense game using C++ with Entity Component System (ECS).
+  * [Runeterra](https://github.com/utilForever/Runeterra): Legends of Runeterra
+    simulator using C++ with some reinforcement learning.
+  * [Black Sun](https://store.steampowered.com/app/1670930/Black_Sun/): fly your
+    space ship through a large 2D open world.
+  * [PokeMaster](https://github.com/utilForever/PokeMaster): Pokemon Battle
+    simulator using C++ with some reinforcement learning.
+  * [HomeHearth](https://youtu.be/GrEWl8npL9Y): choose your hero, protect the
+    town, before it's too late.
+  * [City Builder Game](https://github.com/PhiGei2000/CityBuilderGame): a simple
+    city-building game using C++ and OpenGL.
+  * [BattleSub](https://github.com/bfeldpw/battlesub): two player 2D submarine
+    game with some fluid dynamics.
+  * [Crimson Rush](https://github.com/WilKam01/LuaCGame): a dungeon-crawler and
+    rougelike inspired game about exploring and surviving as long as possible.
+  * [Space Fight](https://github.com/cholushkin/SpaceFight): one screen
+    multi-player arcade shooter game prototype.
+  * [Confetti Party](https://github.com/hexerei/entt-confetti): C++ sample
+    application as a starting point using `EnTT` and `SDL2`.
+
+* Engines and the like:
+  * [Aether Engine](https://hadean.com/spatial-simulation/)
+    [v1.1+](https://docs.hadean.com/v1.1/Licenses/) by
+    [Hadean](https://hadean.com/): a library designed for spatially partitioning
+    agent-based simulations.
+  * [Fling Engine](https://github.com/flingengine/FlingEngine): a Vulkan game
+    engine with a focus on data oriented design.
+  * [NovusCore](https://github.com/novuscore/NovusCore): a modern take on World
+    of Warcraft emulation.
+  * [Chrysalis](https://github.com/ivanhawkes/Chrysalis): action RPG SDK for
+    CRYENGINE games.
+  * [LM-Engine](https://github.com/Lawrencemm/LM-Engine): the Vim of game
+    engines.
+  * [Edyn](https://github.com/xissburg/edyn): a real-time physics engine
+    organized as an ECS.
+  * [MushMachine](https://github.com/MadeOfJelly/MushMachine): engine...
+    vrooooommm.
+  * [Antara Gaming SDK](https://github.com/KomodoPlatform/antara-gaming-sdk):
+    the Komodo Gaming Software Development Kit.
+  * [XVP](https://ravingbots.com/xvp-expansive-vehicle-physics-for-unreal-engine/):
+    [_eXpansive Vehicle Physics_](https://github.com/raving-bots/xvp/wiki/Plugin-integration-guide)
+    plugin for Unreal Engine.
+  * [Apparently](https://teamwisp.github.io/credits/)
+    [Wisp](https://teamwisp.github.io/product/) by
+    [Team Wisp](https://teamwisp.github.io/): an advanced real-time ray tracing
+    renderer built for the demands of video game artists.
+  * [shiva](https://github.com/Milerius/shiva): modern C++ engine with
+    modularity.
+  * [ImGui/EnTT editor](https://github.com/Green-Sky/imgui_entt_entity_editor):
+    a drop-in, single-file entity editor for `EnTT` that uses `ImGui` as
+    graphical backend (with
+    [demo code](https://github.com/Green-Sky/imgui_entt_entity_editor_demo)).
+  * [SgOgl](https://github.com/stwe/SgOgl): a game engine library for OpenGL
+    developed for educational purposes.
+  * [Lumos](https://github.com/jmorton06/Lumos): game engine written in C++
+    using OpenGL and Vulkan.
+  * [Silvanus](https://github.com/hobbyistmaker/silvanus): Silvanus Fusion 360
+    Box Generator.
+  * [Lina Engine](https://github.com/inanevin/LinaEngine): an open-source,
+    modular, tiny and fast C++ game engine, aimed to develop 3D desktop games.
+  * [Spike](https://github.com/FahimFuad/Spike): a powerful game engine which
+    can run on a toaster.
+  * [Helena Framework](https://github.com/NIKEA-SOFT/HelenaFramework): a modern
+    framework in C++17 for backend development.
+  * [Unity/EnTT](https://github.com/TongTungGiang/unity-entt): tech demo of a
+    native simulation layer using `EnTT` and `Unity` as a rendering engine.
+  * [OverEngine](https://github.com/OverShifted/OverEngine): an over-engineered
+    game engine.
+  * [Electro](https://github.com/Electro-Technologies/Electro): high performance
+    3D game engine with a high emphasis on rendering.
+  * [Kawaii](https://github.com/Mathieu-Lala/Kawaii_Engine): a modern data
+    oriented game engine.
+  * [Becketron](https://github.com/Doctor-Foxling/Becketron): a game engine
+    written mostly in C++.
+  * [Spatial Engine](https://github.com/luizgabriel/Spatial.Engine): a
+    cross-platform engine created on top of google's filament rendering engine.
+  * [Kaguya](https://github.com/KaiH0717/Kaguya): D3D12 Rendering Engine.
+  * [OpenAWE](https://github.com/OpenAWE-Project/OpenAWE): open implementation
+    of the Alan Wake Engine.
+  * [Nazara Engine](https://github.com/DigitalPulseSoftware/NazaraEngine): fast,
+    cross-platform, object-oriented API to help in daily developer life.
+  * [Billy Engine](https://github.com/billy4479/BillyEngine): some kind of a 2D
+    engine based on `SDL2` and `EnTT`.
+  * [Ducktape](https://github.com/DucktapeEngine/Ducktape): an open source C++
+    2D & 3D game engine that focuses on being fast and powerful.
+
+* Articles, videos and blog posts:
+  * [Some posts](https://skypjack.github.io/tags/#entt) on my personal
+    [blog](https://skypjack.github.io/) are about `EnTT`, for those who want to
+    know **more** on this project.
+  * [Game Engine series](https://www.youtube.com/c/TheChernoProject/videos) by
+    [The Cherno](https://github.com/TheCherno) (not only about `EnTT` but also
+    on the use of an ECS in general):
+    - [Intro to EnTT](https://www.youtube.com/watch?v=D4hz0wEB978).
+    - [Entities and Components](https://www.youtube.com/watch?v=-B1iu4QJTUc).
+    - [The ENTITY Class](https://www.youtube.com/watch?v=GfSzeAcsBb0).
+    - [Camera Systems](https://www.youtube.com/watch?v=ubZn7BlrnTU).
+    - [Scene Camera](https://www.youtube.com/watch?v=UKVFRRufKzo).
+    - [Native Scripting](https://www.youtube.com/watch?v=iIUhg88MK5M).
+    - [Native Scripting (now with virtual functions!)](https://www.youtube.com/watch?v=1cHEcrIn8IQ).
+    - [Scene Hierarchy Panel](https://www.youtube.com/watch?v=wziDnE8guvI).
+    - [Properties Panel](https://www.youtube.com/watch?v=NBpB0qscF3E).
+    - [Camera Component UI](https://www.youtube.com/watch?v=RIMt_6agUiU).
+    - [Drawing Component UI](https://www.youtube.com/watch?v=u3yq8s3KuSE).
+    - [Transform Component UI](https://www.youtube.com/watch?v=8JqcXYbzPJc).
+    - [Adding/Removing Entities and Components UI](https://www.youtube.com/watch?v=PsyGmsIgp9M).
+    - [Saving and Loading Scenes](https://www.youtube.com/watch?v=IEiOP7Y-Mbc).
+    - ... And so on.
+      [Check out](https://www.youtube.com/channel/UCQ-W1KE9EYfdxhL6S4twUNw) the
+      _Game Engine Series_ by The Cherno for more videos.
+  * [Space Battle: Huge edition](http://victor.madtriangles.com/code%20experiment/2018/06/11/post-ecs-battle-huge.html):
+    huge space battle built entirely from scratch.
+  * [Space Battle](https://github.com/vblanco20-1/ECS_SpaceBattle): huge space
+    battle built on `UE4`.
+  * [Experimenting with ECS in UE4](http://victor.madtriangles.com/code%20experiment/2018/03/25/post-ue4-ecs-battle.html):
+    interesting article about `UE4` and `EnTT`.
+  * [Implementing ECS architecture in UE4](https://forums.unrealengine.com/development-discussion/c-gameplay-programming/1449913-implementing-ecs-architecture-in-ue4-giant-space-battle):
+    giant space battle.
+  * [Conan Adventures (SFML and EnTT in C++)](https://leinnan.github.io/blog/conan-adventuressfml-and-entt-in-c.html):
+    create projects in modern C++ using `SFML`, `EnTT`, `Conan` and `CMake`.
+  * [Adding EnTT ECS to Chrysalis](https://www.tauradius.com/post/adding-an-ecs-to-chrysalis/):
+    a blog entry (and its 
+    [follow-up](https://www.tauradius.com/post/chrysalis-update-2020-08-02/)) 
+    about the integration of `EnTT` into `Chrysalis`, an action RPG SDK for
+    CRYENGINE games.
+  * [Creating Minecraft in One Week with C++ and Vulkan](https://vazgriz.com/189/creating-minecraft-in-one-week-with-c-and-vulkan/):
+    a crack at recreating Minecraft in one week using a custom C++ engine and
+    Vulkan ([code included](https://github.com/vazgriz/VoxelGame)).
+  * [Ability Creator](https://www.erichildebrand.net/blog/ability-creator-project-retrospect):
+    project retrospect by [Eric Hildebrand](https://www.erichildebrand.net/).
+  * [EnTT Entity Component System Gaming Library](https://gamefromscratch.com/entt-entity-component-system-gaming-library/):
+    `EnTT` on GameFromScratch.com.
+  * [Custom C++ server for UE5](https://youtu.be/fbXZVNCOvjM) optimized for
+    MMO(RPG)s and its [follow-up](https://youtu.be/yGlZeopx2hU) episode about
+    player bots and full external ECS: a series definitely worth looking at.
+
+* Any Other Business:
+  * [ArcGIS Runtime SDKs](https://developers.arcgis.com/arcgis-runtime/) by
+    [Esri](https://www.esri.com/): they use `EnTT` for the internal ECS and the
+    cross platform C++ rendering engine. The SDKs are utilized by a lot of
+    enterprise custom apps, as well as by Esri for its own public applications
+    such as
+    [Explorer](https://play.google.com/store/apps/details?id=com.esri.explorer),
+    [Collector](https://play.google.com/store/apps/details?id=com.esri.arcgis.collector)
+    and
+    [Navigator](https://play.google.com/store/apps/details?id=com.esri.navigator).
+  * [FASTSUITE Edition 2](https://www.fastsuite.com/en_EN/fastsuite/fastsuite-edition-2.html)
+    by [Cenit](http://www.cenit.com/en_EN/about-us/overview.html): they use
+    `EnTT` to drive their simulation, that is, the communication between robot
+    controller emulator and renderer.
+  * [Ragdoll](https://ragdolldynamics.com/): real-time physics for Autodesk Maya
+    2020.
+  * [Project Lagrange](https://github.com/adobe/lagrange): a robust geometry
+    processing library by [Adobe](https://github.com/adobe).
+  * [AtomicDEX](https://github.com/KomodoPlatform/atomicDEX-Desktop): a secure
+    wallet and non-custodial decentralized exchange rolled into one application.
+  * [Apparently](https://www.linkedin.com/in/skypjack/)
+    [NIO](https://www.nio.io/): there was a collaboration to make some changes
+    to `EnTT`, at the time used for internal projects.
+  * [Apparently](https://www.linkedin.com/jobs/view/architekt-c%2B%2B-at-tieto-1219512333/)
+    [Tieto](https://www.tieto.com/): they published a job post where `EnTT` was
+    listed on their software stack.
+  * [Sequentity](https://github.com/alanjfs/sequentity): A MIDI-like
+    sequencer/tracker for C++ and `ImGui` (with `Magnum` and `EnTT`).
+  * [EnTT meets Sol2](https://github.com/skaarj1989/entt-meets-sol2): freely
+    available examples of how to combine `EnTT` and `Sol2`.
+  * [Godot meets EnTT](https://github.com/portaloffreedom/godot_entt_example/):
+    a simple example on how to use `EnTT` within
+    [`Godot`](https://godotengine.org/).
+  * [Godot and GameNetworkingSockets meet EnTT](https://github.com/portaloffreedom/godot_entt_net_example):
+    a simple example on how to use `EnTT` and
+    [`GameNetworkingSockets`](https://github.com/ValveSoftware/GameNetworkingSockets)
+    within [`Godot`](https://godotengine.org/).
+  * [MatchOneEntt](https://github.com/mhaemmerle/MatchOneEntt): port of
+    [Match One](https://github.com/sschmid/Match-One) for `Entitas-CSharp`.
+  * GitHub contains also
+    [many other examples](https://github.com/search?o=desc&q=%22skypjack%2Fentt%22&s=indexed&type=Code)
+    of use of `EnTT` from which to take inspiration if interested.
+
+If you know of other resources out there that are about `EnTT`, feel free to
+open an issue or a PR and I'll be glad to add them to this page.

external/entt/entt/docs/md/locator.md

@@ -0,0 +1,88 @@
+# Crash Course: service locator
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Service locator](#service-locator)
+  * [Opaque handles](#opaque-handles)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Usually, service locators are tightly bound to the services they expose and it's
+hard to define a general purpose solution.<br/>
+This tiny class tries to fill the gap and gets rid of the burden of defining a
+different specific locator for each application.
+
+# Service locator
+
+The service locator API tries to mimic that of `std::optional` and adds some
+extra functionalities on top of it such as allocator support.<br/>
+There are a couple of functions to set up a service, namely `emplace` and
+`allocate_emplace`:
+
+```cpp
+entt::locator<interface>::emplace<service>(argument);
+entt::locator<interface>::allocate_emplace<service>(allocator, argument);
+```
+
+The difference is that the latter expects an allocator as the first argument and
+uses it to allocate the service itself.<br/>
+Once a service is set up, it's retrieved using the `value` function:
+
+```cpp
+interface &service = entt::locator<interface>::value();
+```
+
+Since the service may not be set (and therefore this function may result in an
+undefined behavior), the `has_value` and `value_or` functions are also available
+to test a service locator and to get a fallback service in case there is none:
+
+```cpp
+if(entt::locator<interface>::has_value()) {
+    // ...
+}
+
+interface &service = entt::locator<interface>::value_or<fallback_impl>(argument);
+```
+
+All arguments are used only if necessary, that is, if a service doesn't already
+exist and therefore the fallback service is constructed and returned. In all
+other cases, they are discarded.<br/>
+Finally, to reset a service, use the `reset` function.
+
+## Opaque handles
+
+Sometimes it's useful to _transfer_ a copy of a service to another locator. For
+example, when working across boundaries it's common to _share_ a service with a
+dynamically loaded module.<br/>
+Options aren't much in this case. Among these is the possibility of _exporting_
+services and assigning them to a different locator.
+
+This is what the `handle` and `reset` functions are meant for.<br/>
+The former returns an opaque object useful for _exporting_ (or rather, obtaining
+a reference to) a service. The latter also accepts an optional argument to a
+handle which then allows users to reset a service by initializing it with an
+opaque handle:
+
+```cpp
+auto handle = entt::locator<interface>::handle();
+entt::locator<interface>::reset(handle);
+```
+
+It's worth noting that it's possible to get handles for uninitialized services
+and use them with other locators. Of course, all a user will get is to have an
+uninitialized service elsewhere as well.
+
+Note that exporting a service allows users to _share_ the object currently set
+in a locator. Replacing it won't replace the element even where a service has
+been configured with a handle to the previous item.<br/>
+In other words, if an audio service is replaced with a null object to silence an
+application and the original service was shared, this operation won't propagate
+to the other locators. Therefore, a module that share the ownership of the
+original audio service is still able to emit sounds.

external/entt/entt/docs/md/poly.md

@@ -0,0 +1,359 @@
+# Crash Course: poly
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+  * [Other libraries](#other-libraries)
+* [Concept and implementation](#concept-and-implementation)
+  * [Deduced interface](#deduced-interface)
+  * [Defined interface](#defined-interface)
+  * [Fulfill a concept](#fulfill-a-concept)
+* [Inheritance](#inheritance)
+* [Static polymorphism in the wild](#static-polymorphism-in-the-wild)
+* [Storage size and alignment requirement](#storage-size-and-alignment-requirement)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Static polymorphism is a very powerful tool in C++, albeit sometimes cumbersome
+to obtain.<br/>
+This module aims to make it simple and easy to use.
+
+The library allows to define _concepts_ as interfaces to fulfill with concrete
+classes without having to inherit from a common base.<br/>
+This is, among others, one of the advantages of static polymorphism in general
+and of a generic wrapper like that offered by the `poly` class template in
+particular.<br/>
+What users get is an object that can be passed around as such and not through a
+reference or a pointer, as happens when it comes to working with dynamic
+polymorphism.
+
+Since the `poly` class template makes use of `entt::any` internally, it also
+supports most of its feature. Among the most important, the possibility to
+create aliases to existing and thus unmanaged objects. This allows users to
+exploit the static polymorphism while maintaining ownership of objects.<br/>
+Likewise, the `poly` class template also benefits from the small buffer
+optimization offered by the `entt::any` class and therefore minimizes the number
+of allocations, avoiding them altogether where possible.
+
+## Other libraries
+
+There are some very interesting libraries regarding static polymorphism.<br/>
+Among all, the two that I prefer are:
+
+* [`dyno`](https://github.com/ldionne/dyno): runtime polymorphism done right.
+* [`Poly`](https://github.com/facebook/folly/blob/master/folly/docs/Poly.md):
+  a class template that makes it easy to define a type-erasing polymorphic
+  object wrapper.
+
+The former is admittedly an experimental library, with many interesting ideas.
+I've some doubts about the usefulness of some feature in real world projects,
+but perhaps my lack of experience comes into play here. In my opinion, its only
+flaw is the API which I find slightly more cumbersome than other solutions.<br/>
+The latter was undoubtedly a source of inspiration for this module, although I
+opted for different choices in the implementation of both the final API and some
+feature.
+
+Either way, the authors are gurus of the C++ community, people I only have to
+learn from.
+
+# Concept and implementation
+
+The first thing to do to create a _type-erasing polymorphic object wrapper_ (to
+use the terminology introduced by Eric Niebler) is to define a _concept_ that
+types will have to adhere to.<br/>
+For this purpose, the library offers a single class that supports both deduced
+and fully defined interfaces. Although having interfaces deduced automatically
+is convenient and allows users to write less code in most cases, this has some
+limitations and it's therefore useful to be able to get around the deduction by
+providing a custom definition for the static virtual table.
+
+Once the interface is defined, it will be sufficient to provide a generic
+implementation to fulfill the concept.<br/>
+Also in this case, the library allows customizations based on types or families
+of types, so as to be able to go beyond the generic case where necessary.
+
+## Deduced interface
+
+This is how a concept with a deduced interface is introduced:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    template<typename Base>
+    struct type: Base {
+        void draw() { this->template invoke<0>(*this); }
+    };
+
+    // ...
+};
+```
+
+It's recognizable by the fact that it inherits from an empty type list.<br/>
+Functions can also be const, accept any number of parameters and return a type
+other than `void`:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    template<typename Base>
+    struct type: Base {
+        bool draw(int pt) const { return this->template invoke<0>(*this, pt); }
+    };
+
+    // ...
+};
+```
+
+In this case, all parameters must be passed to `invoke` after the reference to
+`this` and the return value is whatever the internal call returns.<br/>
+As for `invoke`, this is a name that is injected into the _concept_ through
+`Base`, from which one must necessarily inherit. Since it's also a dependent
+name, the `this-> template` form is unfortunately necessary due to the rules of
+the language. However, there exists also an alternative that goes through an
+external call:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    template<typename Base>
+    struct type: Base {
+        void draw() const { entt::poly_call<0>(*this); }
+    };
+
+    // ...
+};
+```
+
+Once the _concept_ is defined, users must provide a generic implementation of it
+in order to tell the system how any type can satisfy its requirements. This is
+done via an alias template within the concept itself.<br/>
+The index passed as a template parameter to either `invoke` or `poly_call`
+refers to how this alias is defined.
+
+## Defined interface
+
+A fully defined concept is no different to one for which the interface is
+deduced, with the only difference that the list of types is not empty this time:
+
+```cpp
+struct Drawable: entt::type_list<void()> {
+    template<typename Base>
+    struct type: Base {
+        void draw() { entt::poly_call<0>(*this); }
+    };
+
+    // ...
+};
+```
+
+Again, parameters and return values other than `void` are allowed. Also, the
+function type must be const when the method to bind to it is const:
+
+```cpp
+struct Drawable: entt::type_list<bool(int) const> {
+    template<typename Base>
+    struct type: Base {
+        bool draw(int pt) const { return entt::poly_call<0>(*this, pt); }
+    };
+
+    // ...
+};
+```
+
+Why should a user fully define a concept if the function types are the same as
+the deduced ones?<br>
+Because, in fact, this is exactly the limitation that can be worked around by
+manually defining the static virtual table.
+
+When things are deduced, there is an implicit constraint.<br/>
+If the concept exposes a member function called `draw` with function type
+`void()`, a concept can be satisfied:
+
+* Either by a class that exposes a member function with the same name and the
+  same signature.
+
+* Or through a lambda that makes use of existing member functions from the
+  interface itself.
+
+In other words, it's not possible to make use of functions not belonging to the
+interface, even if they are present in the types that fulfill the concept.<br/>
+Similarly, it's not possible to deduce a function in the static virtual table
+with a function type different from that of the associated member function in
+the interface itself.
+
+Explicitly defining a static virtual table suppresses the deduction step and
+allows maximum flexibility when providing the implementation for a concept.
+
+## Fulfill a concept
+
+The `impl` alias template of a concept is used to define how it's fulfilled:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    // ...
+
+    template<typename Type>
+    using impl = entt::value_list<&Type::draw>;
+};
+```
+
+In this case, it's stated that the `draw` method of a generic type will be
+enough to satisfy the requirements of the `Drawable` concept.<br/>
+Both member functions and free functions are supported to fulfill concepts:
+
+```cpp
+template<typename Type>
+void print(Type &self) { self.print(); }
+
+struct Drawable: entt::type_list<void()> {
+    // ...
+
+    template<typename Type>
+    using impl = entt::value_list<&print<Type>>;
+};
+```
+
+Likewise, as long as the parameter types and return type support conversions to
+and from those of the function type referenced in the static virtual table, the
+actual implementation may differ in its function type since it's erased
+internally.<br/>
+Moreover, the `self` parameter isn't strictly required by the system and can be
+left out for free functions if not required.
+
+Refer to the inline documentation for more details.
+
+# Inheritance
+
+_Concept inheritance_ is straightforward due to how poly looks like in `EnTT`.
+Therefore, it's quite easy to build hierarchies of concepts if necessary.<br/>
+The only constraint is that all concepts in a hierarchy must belong to the same
+_family_, that is, they must be either all deduced or all defined.
+
+For a deduced concept, inheritance is achieved in a few steps:
+
+```cpp
+struct DrawableAndErasable: entt::type_list<> {
+    template<typename Base>
+    struct type: typename Drawable::template type<Base> {
+        static constexpr auto base = std::tuple_size_v<typename entt::poly_vtable<Drawable>::type>;
+        void erase() { entt::poly_call<base + 0>(*this); }
+    };
+
+    template<typename Type>
+    using impl = entt::value_list_cat_t<
+        typename Drawable::impl<Type>,
+        entt::value_list<&Type::erase>
+    >;
+};
+```
+
+The static virtual table is empty and must remain so.<br/>
+On the other hand, `type` no longer inherits from `Base` and instead forwards
+its template parameter to the type exposed by the _base class_. Internally, the
+size of the static virtual table of the base class is used as an offset for the
+local indexes.<br/>
+Finally, by means of the `value_list_cat_t` utility, the implementation consists
+in appending the new functions to the previous list.
+
+As for a defined concept instead, also the list of types must be extended, in a
+similar way to what is shown for the implementation of the above concept.<br/>
+To do this, it's useful to declare a function that allows to convert a _concept_
+into its underlying `type_list` object:
+
+```cpp
+template<typename... Type>
+entt::type_list<Type...> as_type_list(const entt::type_list<Type...> &);
+```
+
+The definition isn't strictly required, since the function will only be used
+through a `decltype` as it follows:
+
+```cpp
+struct DrawableAndErasable: entt::type_list_cat_t<
+    decltype(as_type_list(std::declval<Drawable>())),
+    entt::type_list<void()>
+> {
+    // ...
+};
+```
+
+Similar to above, `type_list_cat_t` is used to concatenate the underlying static
+virtual table with the new function types.<br/>
+Everything else is the same as already shown instead.
+
+# Static polymorphism in the wild
+
+Once the _concept_ and implementation have been introduced, it will be possible
+to use the `poly` class template to contain instances that meet the
+requirements:
+
+```cpp
+using drawable = entt::poly<Drawable>;
+
+struct circle {
+    void draw() { /* ... */ }
+};
+
+struct square {
+    void draw() { /* ... */ }
+};
+
+// ...
+
+drawable instance{circle{}};
+instance->draw();
+
+instance = square{};
+instance->draw();
+```
+
+The `poly` class template offers a wide range of constructors, from the default
+one (which will return an uninitialized `poly` object) to the copy and move
+constructors, as well as the ability to create objects in-place.<br/>
+Among others, there is also a constructor that allows users to wrap unmanaged
+objects in a `poly` instance (either const or non-const ones):
+
+```cpp
+circle shape;
+drawable instance{std::in_place_type<circle &>, shape};
+```
+
+Similarly, it's possible to create non-owning copies of `poly` from an existing
+object:
+
+```cpp
+drawable other = instance.as_ref();
+```
+
+In both cases, although the interface of the `poly` object doesn't change, it
+won't construct any element or take care of destroying the referenced objects.
+
+Note also how the underlying concept is accessed via a call to `operator->` and
+not directly as `instance.draw()`.<br/>
+This allows users to decouple the API of the wrapper from that of the concept.
+Therefore, where `instance.data()` will invoke the `data` member function of the
+poly object, `instance->data()` will map directly to the functionality exposed
+by the underlying concept.
+
+# Storage size and alignment requirement
+
+Under the hood, the `poly` class template makes use of `entt::any`. Therefore,
+it can take advantage of the possibility of defining at compile-time the size of
+the storage suitable for the small buffer optimization as well as the alignment
+requirements:
+
+```cpp
+entt::basic_poly<Drawable, sizeof(double[4]), alignof(double[4])>
+```
+
+The default size is `sizeof(double[2])`, which seems like a good compromise
+between a buffer that is too large and one unable to hold anything larger than
+an integer. The alignment requirement is optional instead and by default such
+that it's the most stringent (the largest) for any object whose size is at most
+equal to the one provided.<br/>
+It's worth noting that providing a size of 0 (which is an accepted value in all
+respects) will force the system to dynamically allocate the contained objects in
+all cases.

external/entt/entt/docs/md/process.md

@@ -0,0 +1,212 @@
+# Crash Course: cooperative scheduler
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [The process](#the-process)
+  * [Adaptor](#adaptor)
+* [The scheduler](#the-scheduler)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Sometimes processes are a useful tool to work around the strict definition of a
+system and introduce logic in a different way, usually without resorting to the
+introduction of other components.
+
+`EnTT` offers a minimal support to this paradigm by introducing a few classes
+that users can use to define and execute cooperative processes.
+
+# The process
+
+A typical process must inherit from the `process` class template that stays true
+to the CRTP idiom. Moreover, derived classes must specify what's the intended
+type for elapsed times.
+
+A process should expose publicly the following member functions whether needed
+(note that it isn't required to define a function unless the derived class wants
+to _override_ the default behavior):
+
+* `void update(Delta, void *);`
+
+  It's invoked once per tick until a process is explicitly aborted or it
+  terminates either with or without errors. Even though it's not mandatory to
+  declare this member function, as a rule of thumb each process should at
+  least define it to work properly. The `void *` parameter is an opaque pointer
+  to user data (if any) forwarded directly to the process during an update.
+
+* `void init();`
+
+  It's invoked when the process joins the running queue of a scheduler. This
+  happens as soon as it's attached to the scheduler if the process is a top
+  level one, otherwise when it replaces its parent if the process is a
+  continuation.
+
+* `void succeeded();`
+
+  It's invoked in case of success, immediately after an update and during the
+  same tick.
+
+* `void failed();`
+
+  It's invoked in case of errors, immediately after an update and during the
+  same tick.
+
+* `void aborted();`
+
+  It's invoked only if a process is explicitly aborted. There is no guarantee
+  that it executes in the same tick, this depends solely on whether the
+  process is aborted immediately or not.
+
+Derived classes can also change the internal state of a process by invoking
+`succeed` and `fail`, as well as `pause` and `unpause` the process itself. All
+these are protected member functions made available to be able to manage the
+life cycle of a process from a derived class.
+
+Here is a minimal example for the sake of curiosity:
+
+```cpp
+struct my_process: entt::process<my_process, std::uint32_t> {
+    using delta_type = std::uint32_t;
+
+    my_process(delta_type delay)
+        : remaining{delay}
+    {}
+
+    void update(delta_type delta, void *) {
+        remaining -= std::min(remaining, delta);
+
+        // ...
+
+        if(!remaining) {
+            succeed();
+        }
+    }
+
+private:
+    delta_type remaining;
+};
+```
+
+## Adaptor
+
+Lambdas and functors can't be used directly with a scheduler for they are not
+properly defined processes with managed life cycles.<br/>
+This class helps in filling the gap and turning lambdas and functors into
+full-featured processes usable by a scheduler.
+
+The function call operator has a signature similar to the one of the `update`
+function of a process but for the fact that it receives two extra arguments to
+call whenever a process is terminated with success or with an error:
+
+```cpp
+void(Delta delta, void *data, auto succeed, auto fail);
+```
+
+Parameters have the following meaning:
+
+* `delta` is the elapsed time.
+* `data` is an opaque pointer to user data if any, `nullptr` otherwise.
+* `succeed` is a function to call when a process terminates with success.
+* `fail` is a function to call when a process terminates with errors.
+
+Both `succeed` and `fail` accept no parameters at all.
+
+Note that usually users shouldn't worry about creating adaptors at all. A
+scheduler creates them internally each and every time a lambda or a functor is
+used as a process.
+
+# The scheduler
+
+A cooperative scheduler runs different processes and helps managing their life
+cycles.
+
+Each process is invoked once per tick. If it terminates, it's removed
+automatically from the scheduler and it's never invoked again. Otherwise it's
+a good candidate to run one more time the next tick.<br/>
+A process can also have a child. In this case, the parent process is replaced
+with its child when it terminates and only if it returns with success. In case
+of errors, both the parent process and its child are discarded. This way, it's
+easy to create chain of processes to run sequentially.
+
+Using a scheduler is straightforward. To create it, users must provide only the
+type for the elapsed times and no arguments at all:
+
+```cpp
+entt::scheduler<std::uint32_t> scheduler;
+```
+
+It has member functions to query its internal data structures, like `empty` or
+`size`, as well as a `clear` utility to reset it to a clean state:
+
+```cpp
+// checks if there are processes still running
+const auto empty = scheduler.empty();
+
+// gets the number of processes still running
+entt::scheduler<std::uint32_t>::size_type size = scheduler.size();
+
+// resets the scheduler to its initial state and discards all the processes
+scheduler.clear();
+```
+
+To attach a process to a scheduler there are mainly two ways:
+
+* If the process inherits from the `process` class template, it's enough to
+  indicate its type and submit all the parameters required to construct it to
+  the `attach` member function:
+
+  ```cpp
+  scheduler.attach<my_process>(1000u);
+  ```
+
+* Otherwise, in case of a lambda or a functor, it's enough to provide an
+  instance of the class to the `attach` member function:
+
+  ```cpp
+  scheduler.attach([](auto...){ /* ... */ });
+  ```
+
+In both cases, the return value is an opaque object that offers a `then` member
+function to use to create chains of processes to run sequentially.<br/>
+As a minimal example of use:
+
+```cpp
+// schedules a task in the form of a lambda function
+scheduler.attach([](auto delta, void *, auto succeed, auto fail) {
+    // ...
+})
+// appends a child in the form of another lambda function
+.then([](auto delta, void *, auto succeed, auto fail) {
+    // ...
+})
+// appends a child in the form of a process class
+.then<my_process>(1000u);
+```
+
+To update a scheduler and therefore all its processes, the `update` member
+function is the way to go:
+
+```cpp
+// updates all the processes, no user data are provided
+scheduler.update(delta);
+
+// updates all the processes and provides them with custom data
+scheduler.update(delta, &data);
+```
+
+In addition to these functions, the scheduler offers an `abort` member function
+that can be used to discard all the running processes at once:
+
+```cpp
+// aborts all the processes abruptly ...
+scheduler.abort(true);
+
+// ... or gracefully during the next tick
+scheduler.abort();
+```

external/entt/entt/docs/md/reference.md

@@ -0,0 +1,75 @@
+# Similar projects
+
+There are many projects similar to `EnTT`, both open source and not.<br/>
+Some even borrowed some ideas from this library and expressed them in different
+languages.<br/>
+Others developed different architectures from scratch and therefore offer
+alternative solutions with their pros and cons.
+
+Below an incomplete list of those that I've come across so far.<br/>
+If some terms or designs aren't clear, I recommend referring to the
+[_ECS Back and Forth_](https://skypjack.github.io/tags/#ecs) series for all the
+details.
+
+I hope this list can grow much more in the future:
+
+* C:
+  * [destral_ecs](https://github.com/roig/destral_ecs): a single-file ECS based
+    on sparse sets.
+  * [Diana](https://github.com/discoloda/Diana): an ECS that uses sparse sets to
+    keep track of entities in systems.
+  * [Flecs](https://github.com/SanderMertens/flecs): a multithreaded archetype
+    ECS based on semi-contiguous arrays rather than chunks.
+  * [lent](https://github.com/nem0/lent): the Donald Trump of the ECS libraries.
+
+* C++:
+  * [decs](https://github.com/vblanco20-1/decs): a chunk based archetype ECS.
+  * [ecst](https://github.com/SuperV1234/ecst): a multithreaded compile-time
+    ECS that uses sparse sets to keep track of entities in systems.
+  * [EntityX](https://github.com/alecthomas/entityx): a bitset based ECS that
+    uses a single large matrix of components indexed with entities.
+  * [Gaia-ECS](https://github.com/richardbiely/gaia-ecs): a chunk based
+    archetype ECS.
+  * [Polypropylene](https://github.com/pmbittner/Polypropylene): a hybrid
+    solution between an ECS and dynamic mixins.
+
+* C#
+  * [Entitas](https://github.com/sschmid/Entitas-CSharp): the ECS framework for
+    C# and Unity, where _reactive systems_ were invented.
+  * [LeoECS](https://github.com/Leopotam/ecs): simple lightweight C# Entity
+    Component System framework.
+  * [Svelto.ECS](https://github.com/sebas77/Svelto.ECS): a very interesting
+    platform agnostic and table based ECS framework.
+
+* Go:
+  * [gecs](https://github.com/tutumagi/gecs): a sparse sets based ECS inspired 
+    by `EnTT`.
+
+* Javascript:
+  * [\@javelin/ecs](https://github.com/3mcd/javelin/tree/master/packages/ecs):
+    an archetype ECS in TypeScript.
+  * [ecsy](https://github.com/MozillaReality/ecsy): I haven't had the time to
+    investigate the underlying design of `ecsy` but it looks cool anyway.
+
+* Perl:
+  * [Game::Entities](https://gitlab.com/jjatria/perl-game-entities): a simple
+    entity registry for ECS designs inspired by `EnTT`.
+
+* Raku:
+  * [Game::Entities](https://gitlab.com/jjatria/raku-game-entities): a simple
+    entity registry for ECS designs inspired by `EnTT`.
+
+* Rust:
+  * [Legion](https://github.com/TomGillen/legion): a chunk based archetype ECS.
+  * [Shipyard](https://github.com/leudz/shipyard): it borrows some ideas from
+    `EnTT` and offers a sparse sets based ECS with grouping functionalities.
+  * [Sparsey](https://github.com/LechintanTudor/sparsey): sparse set based ECS
+    written in Rust.
+  * [Specs](https://github.com/amethyst/specs): a parallel ECS based mainly on
+    hierarchical bitsets that allows different types of storage as needed.
+
+* Zig
+  * [zig-ecs](https://github.com/prime31/zig-ecs): a _zig-ification_ of `EnTT`.
+
+If you know of other resources out there that can be of interest for the reader,
+feel free to open an issue or a PR and I'll be glad to add them to this page.

external/entt/entt/docs/md/resource.md

@@ -0,0 +1,191 @@
+# Crash Course: resource management
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [The resource, the loader and the cache](#the-resource-the-loader-and-the-cache)
+  * [Resource handle](#resource-handle)
+  * [Loaders](#loader)
+  * [The cache class](#the-cache)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Resource management is usually one of the most critical parts of a game.
+Solutions are often tuned to the particular application. There exist several
+approaches and all of them are perfectly fine as long as they fit the
+requirements of the piece of software in which they are used.<br/>
+Examples are loading everything on start, loading on request, predictive
+loading, and so on.
+
+`EnTT` doesn't pretend to offer a _one-fits-all_ solution for the different
+cases.<br/>
+Instead, the library comes with a minimal, general purpose resource cache that
+might be useful in many cases.
+
+# The resource, the loader and the cache
+
+Resource, loader and cache are the three main actors for the purpose.<br/>
+The _resource_ is an image, an audio, a video or any other type:
+
+```cpp
+struct my_resource { const int value; };
+```
+
+The _loader_ is a callable type the aim of which is to load a specific resource:
+
+```cpp
+struct my_loader final {
+    using result_type = std::shared_ptr<my_resource>;
+
+    result_type operator()(int value) const {
+        // ...
+        return std::make_shared<my_resource>(value);
+    }
+};
+```
+
+Its function operator can accept any arguments and should return a value of the
+declared result type (`std::shared_ptr<my_resource>` in the example).<br/>
+A loader can also overload its function call operator to make it possible to
+construct the same or another resource from different lists of arguments.
+
+Finally, a cache is a specialization of a class template tailored to a specific
+resource and (optionally) a loader:
+
+```cpp
+using my_cache = entt::resource_cache<my_resource, my_loader>;
+
+// ...
+
+my_cache cache{};
+```
+
+The class is designed to create different caches for different resource types
+and to manage each one independently in the most appropriate way.<br/>
+As a (very) trivial example, audio tracks can survive in most of the scenes of
+an application while meshes can be associated with a single scene only, then
+discarded when a player leaves it.
+
+## Resource handle
+
+Resources aren't returned directly to the caller. Instead, they are wrapped in a
+_resource handle_, an instance of the `entt::resource` class template.<br/>
+For those who know the _flyweight design pattern_ already, that's exactly what
+it is. To all others, this is the time to brush up on some notions instead.
+
+A shared pointer could have been used as a resource handle. In fact, the default
+implementation mostly maps the interface of its standard counterpart and only
+adds a few things on top of it.<br/>
+However, the handle in `EnTT` is designed as a standalone class template. This
+is due to the fact that specializing a class in the standard library is often
+undefined behavior while having the ability to specialize the handle for one,
+more or all resource types could help over time.
+
+## Loaders
+
+A loader is responsible for _loading_ resources (quite obviously).<br/>
+By default, it's just a callable object that forwards its arguments to the
+resource itself. That is, a _passthrough type_. All the work is demanded to the
+constructor(s) of the resource itself.<br/>
+Loaders also are fully customizable as expected.
+
+A custom loader is a class with at least one function call operator and a member
+type named `result_type`.<br/>
+The loader isn't required to return a resource handle. As long as `return_type`
+is suitable for constructing a handle, that's fine.
+
+When using the default handle, it expects a resource type which is convertible
+to or suitable for constructing an `std::shared_ptr<Type>` (where `Type` is the
+actual resource type).<br/>
+In other terms, the loader should return shared pointers to the given resource
+type. However, this isn't mandatory. Users can easily get around this constraint
+by specializing both the handle and the loader.
+
+A cache forwards all its arguments to the loader if required. This means that
+loaders can also support tag dispatching to offer different loading policies:
+
+```cpp
+struct my_loader {
+    using result_type = std::shared_ptr<my_resource>;
+
+    struct from_disk_tag{};
+    struct from_network_tag{};
+
+    template<typename Args>
+    result_type operator()(from_disk_tag, Args&&... args) {
+        // ...
+        return std::make_shared<my_resource>(std::forward<Args>(args)...);
+    }
+
+    template<typename Args>
+    result_type operator()(from_network_tag, Args&&... args) {
+        // ...
+        return std::make_shared<my_resource>(std::forward<Args>(args)...);
+    }
+}
+```
+
+This makes the whole loading logic quite flexible and easy to extend over time.
+
+## The cache class
+
+The cache is the class that is asked to _connect the dots_.<br/>
+It loads the resources, stores them aside and returns handles as needed:
+
+```cpp
+entt::resource_cache<my_resource, my_loader> cache{};
+```
+
+Under the hood, a cache is nothing more than a map where the key value has type
+`entt::id_type` while the mapped value is whatever type its loader returns.<br/>
+For this reason, it offers most of the functionalities a user would expect from
+a map, such as `empty` or `size` and so on. Similarly, it's an iterable type
+that also supports indexing by resource id:
+
+```cpp
+for(auto [id, res]: cache) {
+    // ...
+}
+
+if(entt::resource<my_resource> res = cache["resource/id"_hs]; res) {
+    // ...
+}
+```
+
+Please, refer to the inline documentation for all the details about the other
+functions (such as `contains` or `erase`).
+
+Set aside the part of the API that this class _shares_ with a map, it also adds
+something on top of it in order to address the most common requirements of a
+resource cache.<br/>
+In particular, it doesn't have an `emplace` member function which is replaced by
+`load` and `force_load` instead (where the former loads a new resource only if
+not present while the second triggers a forced loading in any case):
+
+```cpp
+auto ret = cache.load("resource/id"_hs);
+
+// true only if the resource was not already present
+const bool loaded = ret.second;
+
+// takes the resource handle pointed to by the returned iterator
+entt::resource<my_resource> res = ret.first->second;
+```
+
+Note that the hashed string is used for convenience in the example above.<br/>
+Resource identifiers are nothing more than integral values. Therefore, plain
+numbers as well as non-class enum value are accepted.
+
+It's worth mentioning that the iterators of a cache as well as its indexing
+operators return resource handles rather than instances of the mapped type.<br/>
+Since the cache has no control over the loader and a resource isn't required to
+also be convertible to bool, these handles can be invalid. This usually means an
+error in the user logic but it may also be an _expected_ event.<br/>
+It's therefore recommended to verify handles validity with a check in debug (for
+example, when loading) or an appropriate logic in retail.

external/entt/entt/docs/md/signal.md

@@ -0,0 +1,549 @@
+# Crash Course: events, signals and everything in between
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Delegate](#delegate)
+  * [Runtime arguments](#runtime-arguments)
+  * [Lambda support](#lambda-support)
+* [Signals](#signals)
+* [Event dispatcher](#event-dispatcher)
+  * [Named queues](#named-queues)
+* [Event emitter](#event-emitter)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Signals are more often than not a core part of games and software architectures
+in general.<br/>
+They help to decouple the various parts of a system while allowing them to
+communicate with each other somehow.
+
+The so called _modern C++_ comes with a tool that can be useful in this regard,
+the `std::function`. As an example, it can be used to create delegates.<br/>
+However, there is no guarantee that an `std::function` doesn't perform
+allocations under the hood and this could be problematic sometimes. Furthermore,
+it solves a problem but may not adapt well to other requirements that may arise
+from time to time.
+
+In case that the flexibility and power of an `std::function` isn't required or
+if the price to pay for them is too high, `EnTT` offers a complete set of
+lightweight classes to solve the same and many other problems.
+
+# Delegate
+
+A delegate can be used as a general purpose invoker with no memory overhead for
+free functions and member functions provided along with an instance on which to
+invoke them.<br/>
+It doesn't claim to be a drop-in replacement for an `std::function`, so don't
+expect to use it whenever an `std::function` fits well. That said, it's most
+likely even a better fit than an `std::function` in a lot of cases, so expect to
+use it quite a lot anyway.
+
+The interface is trivial. It offers a default constructor to create empty
+delegates:
+
+```cpp
+entt::delegate<int(int)> delegate{};
+```
+
+What is needed to create an instance is to specify the type of the function the
+delegate _accepts_, that is the signature of the functions it models.<br/>
+However, attempting to use an empty delegate by invoking its function call
+operator results in undefined behavior or most likely a crash.
+
+There exist a few overloads of the `connect` member function to initialize a
+delegate:
+
+```cpp
+int f(int i) { return i; }
+
+struct my_struct {
+    int f(const int &i) const { return i; }
+};
+
+// bind a free function to the delegate
+delegate.connect<&f>();
+
+// bind a member function to the delegate
+my_struct instance;
+delegate.connect<&my_struct::f>(instance);
+```
+
+The delegate class also accepts data members, if needed. In this case, the
+function type of the delegate is such that the parameter list is empty and the
+value of the data member is at least convertible to the return type.
+
+Free functions having type equivalent to `void(T &, args...)` are accepted as
+well. The first argument `T &` is considered a payload and the function will
+receive it back every time it's invoked. In other terms, this works just fine
+with the above definition:
+
+```cpp
+void g(const char &c, int i) { /* ... */ }
+const char c = 'c';
+
+delegate.connect<&g>(c);
+delegate(42);
+```
+
+The function `g` is invoked with a reference to `c` and `42`. However, the
+function type of the delegate is still `void(int)`. This is also the signature
+of its function call operator.<br/>
+Another interesting aspect of the delegate class is that it accepts functions
+with a list of parameters that is shorter than that of its function type:
+
+```cpp
+void g() { /* ... */ }
+delegate.connect<&g>();
+delegate(42);
+```
+
+Where the function type of the delegate is `void(int)` as above. It goes without
+saying that the extra arguments are silently discarded internally.<br/>
+This is a nice-to-have feature in a lot of cases, as an example when the
+`delegate` class is used as a building block of a signal-slot system.
+
+To create and initialize a delegate at once, there are a few specialized
+constructors. Because of the rules of the language, the listener is provided by
+means of the `entt::connect_arg` variable template:
+
+```cpp
+entt::delegate<int(int)> func{entt::connect_arg<&f>};
+```
+
+Aside `connect`, a `disconnect` counterpart isn't provided. Instead, there
+exists a `reset` member function to use to clear a delegate.<br/>
+To know if a delegate is empty, it can be used explicitly in every conditional
+statement:
+
+```cpp
+if(delegate) {
+    // ...
+}
+```
+
+Finally, to invoke a delegate, the function call operator is the way to go as
+already shown in the examples above:
+
+```cpp
+auto ret = delegate(42);
+```
+
+In all cases, listeners don't have to strictly follow the signature of the
+delegate. As long as a listener can be invoked with the given arguments to yield
+a result that is convertible to the given result type, everything works just
+fine.
+
+As a side note, members of classes may or may not be associated with instances.
+If they are not, the first argument of the function type must be that of the
+class on which the members operate and an instance of this class must obviously
+be passed when invoking the delegate:
+
+```cpp
+entt::delegate<void(my_struct &, int)> delegate;
+delegate.connect<&my_struct::f>();
+
+my_struct instance;
+delegate(instance, 42);
+```
+
+In this case, it's not possible to _deduce_ the function type since the first
+argument doesn't necessarily have to be a reference (for example, it can be a
+pointer, as well as a const reference).<br/>
+Therefore, the function type must be declared explicitly for unbound members.
+
+## Runtime arguments
+
+The `delegate` class is meant to be used primarily with template arguments.
+However, as a consequence of its design, it also offers minimal support for
+runtime arguments.<br/>
+When used like this, some features aren't supported though. In particular:
+
+* Curried functions aren't accepted.
+* Functions with an argument list that differs from that of the delegate aren't
+  supported.
+* Return type and types of arguments **must** coincide with those of the
+  delegate and _being at least convertible_ isn't enough anymore.
+
+Moreover, for a given function type `Ret(Args...)`, the signature of the
+functions connected at runtime must necessarily be `Ret(const void *, Args...)`.
+
+Runtime arguments can be passed both to the constructor of a delegate and to the
+`connect` member function. An optional parameter is also accepted in both cases.
+This argument is used to pass arbitrary user data back and forth as a
+`const void *` upon invocation.<br/>
+To connect a function to a delegate _in the hard way_:
+
+```cpp
+int func(const void *ptr, int i) { return *static_cast<const int *>(ptr) * i; }
+const int value = 42;
+
+// use the constructor ...
+entt::delegate delegate{&func, &value};
+
+// ... or the connect member function
+delegate.connect(&func, &value);
+```
+
+The type of the delegate is deduced from the function if possible. In this case,
+since the first argument is an implementation detail, the deduced function type
+is `int(int)`.<br/>
+Invoking a delegate built in this way follows the same rules as previously
+explained.
+
+## Lambda support
+
+In general, the `delegate` class doesn't fully support lambda functions in all
+their nuances. The reason is pretty simple: a `delegate` isn't a drop-in
+replacement for an `std::function`. Instead, it tries to overcome the problems
+with the latter.<br/>
+That being said, non-capturing lambda functions are supported, even though some
+features aren't available in this case.
+
+This is a logical consequence of the support for connecting functions at
+runtime. Therefore, lambda functions undergo the same rules and
+limitations.<br/>
+In fact, since non-capturing lambda functions decay to pointers to functions,
+they can be used with a `delegate` as if they were _normal functions_ with
+optional payload:
+
+```cpp
+my_struct instance;
+
+// use the constructor ...
+entt::delegate delegate{+[](const void *ptr, int value) {
+    return static_cast<const my_struct *>(ptr)->f(value);
+}, &instance};
+
+// ... or the connect member function
+delegate.connect([](const void *ptr, int value) {
+    return static_cast<const my_struct *>(ptr)->f(value);
+}, &instance);
+```
+
+As above, the first parameter (`const void *`) isn't part of the function type
+of the delegate and is used to dispatch arbitrary user data back and forth. In
+other terms, the function type of the delegate above is `int(int)`.
+
+# Signals
+
+Signal handlers work with references to classes, function pointers and pointers
+to members. Listeners can be any kind of objects and users are in charge of
+connecting and disconnecting them from a signal to avoid crashes due to
+different lifetimes. On the other side, performance shouldn't be affected that
+much by the presence of such a signal handler.<br/>
+Signals make use of delegates internally and therefore they undergo the same
+rules and offer similar functionalities. It may be a good idea to consult the
+documentation of the `delegate` class for further information.
+
+A signal handler is can be used as a private data member without exposing any
+_publish_ functionality to the clients of a class.<br/>
+The basic idea is to impose a clear separation between the signal itself and the
+`sink` class, that is a tool to be used to connect and disconnect listeners on
+the fly.
+
+The API of a signal handler is straightforward. If a collector is supplied to
+the signal when something is published, all the values returned by its listeners
+are literally _collected_ and used later by the caller. Otherwise, the class
+works just like a plain signal that emits events from time to time.<br/>
+To create instances of signal handlers it's sufficient to provide the type of
+function to which they refer:
+
+```cpp
+entt::sigh<void(int, char)> signal;
+```
+
+Signals offer all the basic functionalities required to know how many listeners
+they contain (`size`) or if they contain at least a listener (`empty`), as well
+as a function to use to swap handlers (`swap`).
+
+Besides them, there are member functions to use both to connect and disconnect
+listeners in all their forms by means of a sink:
+
+```cpp
+void foo(int, char) { /* ... */ }
+
+struct listener {
+    void bar(const int &, char) { /* ... */ }
+};
+
+// ...
+
+entt::sink sink{signal};
+listener instance;
+
+sink.connect<&foo>();
+sink.connect<&listener::bar>(instance);
+
+// ...
+
+// disconnects a free function
+sink.disconnect<&foo>();
+
+// disconnect a member function of an instance
+sink.disconnect<&listener::bar>(instance);
+
+// disconnect all member functions of an instance, if any
+sink.disconnect(instance);
+
+// discards all listeners at once
+sink.disconnect();
+```
+
+As shown above, listeners don't have to strictly follow the signature of the
+signal. As long as a listener can be invoked with the given arguments to yield a
+result that is convertible to the given return type, everything works just
+fine.<br/>
+It's also possible to connect a listener before other elements already contained
+by the signal. The `before` function returns a `sink` object that is correctly
+initialized for the purpose and can be used to connect one or more listeners in
+order and in the desired position:
+
+```cpp
+sink.before<&foo>().connect<&listener::bar>(instance);
+```
+
+In all cases, the `connect` member function returns by default a `connection`
+object to be used as an alternative to break a connection by means of its
+`release` member function.<br/>
+A `scoped_connection` can also be created from a connection. In this case, the
+link is broken automatically as soon as the object goes out of scope.
+
+Once listeners are attached (or even if there are no listeners at all), events
+and data in general are published through a signal by means of the `publish`
+member function:
+
+```cpp
+signal.publish(42, 'c');
+```
+
+To collect data, the `collect` member function is used instead:
+
+```cpp
+int f() { return 0; }
+int g() { return 1; }
+
+// ...
+
+entt::sigh<int()> signal;
+entt::sink sink{signal};
+
+sink.connect<&f>();
+sink.connect<&g>();
+
+std::vector<int> vec{};
+signal.collect([&vec](int value) { vec.push_back(value); });
+
+assert(vec[0] == 0);
+assert(vec[1] == 1);
+```
+
+A collector must expose a function operator that accepts as an argument a type
+to which the return type of the listeners can be converted. Moreover, it can
+optionally return a boolean value that is true to stop collecting data, false
+otherwise. This way one can avoid calling all the listeners in case it isn't
+necessary.<br/>
+Functors can also be used in place of a lambda. Since the collector is copied
+when invoking the `collect` member function, `std::ref` is the way to go in this
+case:
+
+```cpp
+struct my_collector {
+    std::vector<int> vec{};
+
+    bool operator()(int v) {
+        vec.push_back(v);
+        return true;
+    }
+};
+
+// ...
+
+my_collector collector;
+signal.collect(std::ref(collector));
+```
+
+# Event dispatcher
+
+The event dispatcher class allows users to trigger immediate events or to queue
+and publish them all together later.<br/>
+This class lazily instantiates its queues. Therefore, it's not necessary to
+_announce_ the event types in advance:
+
+```cpp
+// define a general purpose dispatcher
+entt::dispatcher dispatcher{};
+```
+
+A listener registered with a dispatcher is such that its type offers one or more
+member functions that take arguments of type `Event &` for any type of event,
+regardless of the return value.<br/>
+These functions are linked directly via `connect` to a _sink_:
+
+```cpp
+struct an_event { int value; };
+struct another_event {};
+
+struct listener {
+    void receive(const an_event &) { /* ... */ }
+    void method(const another_event &) { /* ... */ }
+};
+
+// ...
+
+listener listener;
+dispatcher.sink<an_event>().connect<&listener::receive>(listener);
+dispatcher.sink<another_event>().connect<&listener::method>(listener);
+```
+
+Note that connecting listeners within event handlers can result in undefined
+behavior.<br/>
+The `disconnect` member function is used to remove one listener at a time or all
+of them at once:
+
+```cpp
+dispatcher.sink<an_event>().disconnect<&listener::receive>(listener);
+dispatcher.sink<another_event>().disconnect(listener);
+```
+
+The `trigger` member function serves the purpose of sending an immediate event
+to all the listeners registered so far:
+
+```cpp
+dispatcher.trigger(an_event{42});
+dispatcher.trigger<another_event>();
+```
+
+Listeners are invoked immediately, order of execution isn't guaranteed. This
+method can be used to push around urgent messages like an _is terminating_
+notification on a mobile app.
+
+On the other hand, the `enqueue` member function queues messages together and
+helps to maintain control over the moment they are sent to listeners:
+
+```cpp
+dispatcher.enqueue<an_event>(42);
+dispatcher.enqueue(another_event{});
+```
+
+Events are stored aside until the `update` member function is invoked:
+
+```cpp
+// emits all the events of the given type at once
+dispatcher.update<an_event>();
+
+// emits all the events queued so far at once
+dispatcher.update();
+```
+
+This way users can embed the dispatcher in a loop and literally dispatch events
+once per tick to their systems.
+
+## Named queues
+
+All queues within a dispatcher are associated by default with an event type and
+then retrieved from it.<br/>
+However, it's possible to create queues with different _names_ (and therefore
+also multiple queues for a single type). In fact, more or less all functions
+also take an additional parameter. As an example:
+
+```cpp
+dispatcher.sink<an_event>("custom"_hs).connect<&listener::receive>(listener);
+```
+
+In this case, the term _name_ is misused as these are actual numeric identifiers
+of type `id_type`.<br/>
+An exception to this rule is the `enqueue` function. There is no additional
+parameter for it but rather a different function:
+
+```cpp
+dispatcher.enqueue_hint<an_event>("custom"_hs, 42);
+```
+
+This is mainly due to the template argument deduction rules and unfortunately
+there is no real (elegant) way to avoid it.
+
+# Event emitter
+
+A general purpose event emitter thought mainly for those cases where it comes to
+working with asynchronous stuff.<br/>
+Originally designed to fit the requirements of
+[`uvw`](https://github.com/skypjack/uvw) (a wrapper for `libuv` written in
+modern C++), it was adapted later to be included in this library.
+
+To create an emitter type, derived classes must inherit from the base as:
+
+```cpp
+struct my_emitter: emitter<my_emitter> {
+    // ...
+}
+```
+
+Handlers for the different events are created internally on the fly. It's not
+required to specify in advance the full list of accepted events.<br/>
+Moreover, whenever an event is published, an emitter also passes a reference
+to itself to its listeners.
+
+To create new instances of an emitter, no arguments are required:
+
+```cpp
+my_emitter emitter{};
+```
+
+Listeners are movable and callable objects (free functions, lambdas, functors,
+`std::function`s, whatever) whose function type is compatible with:
+
+```cpp
+void(Type &, my_emitter &)
+```
+
+Where `Type` is the type of event they want to receive.<br/>
+To attach a listener to an emitter, there exists the `on` member function:
+
+```cpp
+emitter.on<my_event>([](const my_event &event, my_emitter &emitter) {
+    // ...
+});
+```
+
+Similarly, the `reset` member function is used to disconnect listeners given a
+type while `clear` is used to disconnect all listeners at once:
+
+```cpp
+// resets the listener for my_event
+emitter.erase<my_event>();
+
+// resets all listeners
+emitter.clear()
+```
+
+To send an event to the listener registered on a given type, the `publish`
+function is the way to go:
+
+```cpp
+struct my_event { int i; };
+
+// ...
+
+emitter.publish(my_event{42});
+```
+
+Finally, the `empty` member function tests if there exists at least a listener
+registered with the event emitter while `contains` is used to check if a given
+event type is associated with a valid listener:
+
+```cpp
+if(emitter.contains<my_event>()) {
+    // ...
+}
+```
+
+This class introduces a _nice-to-have_ model based on events and listeners.<br/>
+More in general, it's a handy tool when the derived classes _wrap_ asynchronous
+operations but it's not limited to such uses.

external/entt/entt/docs/md/unreal.md

@@ -0,0 +1,107 @@
+# EnTT and Unreal Engine
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Enable Cpp17](#enable-cpp17)
+* [EnTT as a third party module](#entt-as-a-third-party-module)
+* [Include EnTT](#include-entt)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+## Enable Cpp17
+
+As of writing (Unreal Engine v4.25), the default C++ standard of Unreal Engine
+is C++14.<br/>
+On the other hand, note that `EnTT` requires C++17 to compile. To enable it, in
+the main module of the project there should be a `<Game Name>.Build.cs` file,
+the constructor of which must contain the following lines:
+
+```cs
+PCHUsage = PCHUsageMode.NoSharedPCHs;
+PrivatePCHHeaderFile = "<PCH filename>.h";
+CppStandard = CppStandardVersion.Cpp17;
+```
+
+Replace `<PCH filename>.h` with the name of the already existing PCH header
+file, if any.<br/>
+In case the project doesn't already contain a file of this type, it's possible
+to create one with the following content:
+
+```cpp
+#pragma once
+#include "CoreMinimal.h"
+```
+
+Remember to remove any old `PCHUsage = <...>` line that was previously there. At
+this point, C++17 support should be in place.<br/>
+Try to compile the project to ensure it works as expected before following
+further steps.
+
+Note that updating a *project* to C++17 doesn't necessarily mean that the IDE in
+use will also start to recognize its syntax.<br/>
+If the plan is to use C++17 in the project too, check the specific instructions
+for the IDE in use.
+
+## EnTT as a third party module
+
+Once this point is reached, the `Source` directory should look like this:
+
+```
+Source
+|  MyGame.Target.cs
+|  MyGameEditor.Target.cs
+|
++---MyGame
+|  |  MyGame.Build.cs
+|  |  MyGame.h (PCH Header file)
+|
+\---ThirdParty
+   \---EnTT
+      |   EnTT.Build.cs
+      |
+      \---entt (GitHub repository content inside)
+```
+
+To make this happen, create the folder `ThirdParty` under `Source` if it doesn't
+exist already. Then, add an `EnTT` folder under `ThirdParty`.<br/>
+Within the latter, create a new file `EnTT.Build.cs` with the following content:
+
+```cs
+using System.IO;
+using UnrealBuildTool;
+
+public class EnTT: ModuleRules {
+    public EnTT(ReadOnlyTargetRules Target) : base(Target) {
+        Type = ModuleType.External;
+        PublicIncludePaths.Add(Path.Combine(ModuleDirectory, "entt", "src", "entt"));
+    }
+}
+```
+
+The last line indicates that the actual files will be found in the directory
+`EnTT/entt/src/entt`.<br/>
+Download the repository for `EnTT` and place it next to `EnTT.Build.cs` or
+update the path above accordingly.
+
+Finally, open the `<Game Name>.Build.cs` file and add `EnTT` as a dependency at
+the end of the list:
+
+```cs
+PublicDependencyModuleNames.AddRange(new[] {
+    "Core", "CoreUObject", "Engine", "InputCore", [...], "EnTT"
+});
+```
+
+Note that some IDEs might require a restart to start recognizing the new module
+for code-highlighting features and such.
+
+## Include EnTT
+
+In any source file of the project, add `#include "entt.hpp"` or any other path
+to the file from `EnTT` to use it.<br/>
+Try to create a registry as `entt::registry registry;` to make sure everything
+compiles fine.

external/entt/entt/entt.imp

@@ -0,0 +1,34 @@
+[
+  { "include": [ "@<gtest/internal/.*>", "private", "<gtest/gtest.h>", "public" ] },
+  { "include": [ "@<gtest/gtest-.*>", "private", "<gtest/gtest.h>", "public" ] },
+  { "include": [ "@[\"<].*/container/fwd.hpp[\">]", "private", "<entt/container/dense_map.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/container/fwd.hpp[\">]", "private", "<entt/container/dense_set.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/any.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/family.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/hashed_string.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/ident.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/monostate.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/type_info.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/type_traits.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/entity.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/group.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/handle.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/helper.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/observer.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/organizer.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/runtime_view.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/snapshot.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/sparse_set.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/storage.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/view.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/meta/fwd.hpp[\">]", "private", "<entt/meta/meta.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/poly/fwd.hpp[\">]", "private", "<entt/poly/poly.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/resource/fwd.hpp[\">]", "private", "<entt/resource/cache.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/resource/fwd.hpp[\">]", "private", "<entt/resource/loader.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/resource/fwd.hpp[\">]", "private", "<entt/resource/resource.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/delegate.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/dispatcher.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/emitter.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/sigh.hpp>", "public" ] }
+]

external/entt/entt/natvis/entt/config.natvis

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>

external/entt/entt/natvis/entt/container.natvis

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::dense_map&lt;*&gt;">
+		<Intrinsic Name="size" Expression="packed.first_base::value.size()"/>
+		<Intrinsic Name="bucket_count" Expression="sparse.first_base::value.size()"/>
+		<DisplayString>{{ size={ size() } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" ExcludeView="simple">packed.first_base::value.capacity()</Item>
+			<Item Name="[bucket_count]" ExcludeView="simple">bucket_count()</Item>
+			<Item Name="[load_factor]" ExcludeView="simple">(float)size() / (float)bucket_count()</Item>
+			<Item Name="[max_load_factor]" ExcludeView="simple">threshold</Item>
+			<IndexListItems>
+				<Size>size()</Size>
+				<ValueNode>packed.first_base::value[$i].element</ValueNode>
+			</IndexListItems>
+		</Expand>
+	</Type>
+	<Type Name="entt::dense_set&lt;*&gt;">
+		<Intrinsic Name="size" Expression="packed.first_base::value.size()"/>
+		<Intrinsic Name="bucket_count" Expression="sparse.first_base::value.size()"/>
+		<DisplayString>{{ size={ size() } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" ExcludeView="simple">packed.first_base::value.capacity()</Item>
+			<Item Name="[bucket_count]" ExcludeView="simple">bucket_count()</Item>
+			<Item Name="[load_factor]" ExcludeView="simple">(float)size() / (float)bucket_count()</Item>
+			<Item Name="[max_load_factor]" ExcludeView="simple">threshold</Item>
+			<IndexListItems>
+				<Size>size()</Size>
+				<ValueNode>packed.first_base::value[$i].second</ValueNode>
+			</IndexListItems>
+		</Expand>
+	</Type>
+</AutoVisualizer>

external/entt/entt/natvis/entt/core.natvis

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+    <Type Name="entt::basic_any&lt;*&gt;">
+		<DisplayString>{{ type={ info->alias,na }, policy={ mode,en } }}</DisplayString>
+    </Type>
+	<Type Name="entt::compressed_pair&lt;*&gt;">
+		<Intrinsic Name="first" Optional="true" Expression="((first_base*)this)->value"/>
+		<Intrinsic Name="first" Optional="true" Expression="*(first_base::base_type*)this"/>
+		<Intrinsic Name="second" Optional="true" Expression="((second_base*)this)->value"/>
+		<Intrinsic Name="second" Optional="true" Expression="*(second_base::base_type*)this"/>
+		<DisplayString >({ first() }, { second() })</DisplayString>
+		<Expand>
+			<Item Name="[first]">first()</Item>
+			<Item Name="[second]">second()</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_hashed_string&lt;*&gt;">
+		<DisplayString Condition="base_type::repr != nullptr">{{ hash={ base_type::hash } }}</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<Item Name="[data]">base_type::repr,na</Item>
+			<Item Name="[length]">base_type::length</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::type_info">
+		<DisplayString>{{ name={ alias,na } }}</DisplayString>
+		<Expand>
+			<Item Name="[hash]">identifier</Item>
+			<Item Name="[index]">seq</Item>
+		</Expand>
+	</Type>
+</AutoVisualizer>

external/entt/entt/natvis/entt/entity.natvis

@@ -0,0 +1,153 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::basic_registry&lt;*&gt;">
+		<Intrinsic Name="pools_size" Expression="pools.packed.first_base::value.size()"/>
+		<Intrinsic Name="vars_size" Expression="vars.ctx.packed.first_base::value.size()"/>
+		<Intrinsic Name="to_entity" Expression="*((entity_traits::entity_type *)&amp;entity) &amp; entity_traits::entity_mask">
+			<Parameter Name="entity" Type="entity_traits::value_type &amp;"/>
+		</Intrinsic>
+		<DisplayString>{{ size={ epool.size() } }}</DisplayString>
+		<Expand>
+			<Item IncludeView="simple" Name="[epool]">epool,view(simple)nr</Item>
+			<Synthetic Name="[epool]" ExcludeView="simple">
+				<DisplayString>{ epool.size() }</DisplayString>
+				<Expand>
+					<CustomListItems>
+						<Variable Name="pos" InitialValue="0" />
+						<Variable Name="last" InitialValue="epool.size()"/>
+						<Loop>
+							<Break Condition="pos == last"/>
+							<If Condition="to_entity(epool[pos]) == pos">
+								<Item Name="[{ pos }]">epool[pos]</Item>
+							</If>
+							<Exec>++pos</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+			<Synthetic Name="[destroyed]" ExcludeView="simple">
+				<DisplayString>{ to_entity(free_list) != entity_traits::entity_mask }</DisplayString>
+				<Expand>
+					<CustomListItems>
+						<Variable Name="it" InitialValue="to_entity(free_list)" />
+						<Loop>
+							<Break Condition="it == entity_traits::entity_mask"/>
+							<Item Name="[{ it }]">epool[it]</Item>
+							<Exec>it = to_entity(epool[it])</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+			<Synthetic Name="[pools]">
+				<DisplayString>{ pools_size() }</DisplayString>
+				<Expand>
+					<IndexListItems ExcludeView="simple">
+						<Size>pools_size()</Size>
+						<ValueNode>*pools.packed.first_base::value[$i].element.second</ValueNode>
+					</IndexListItems>
+					<IndexListItems IncludeView="simple">
+						<Size>pools_size()</Size>
+						<ValueNode>*pools.packed.first_base::value[$i].element.second,view(simple)</ValueNode>
+					</IndexListItems>
+				</Expand>
+			</Synthetic>
+			<Item Name="[groups]" ExcludeView="simple">groups.size()</Item>
+			<Synthetic Name="[vars]">
+				<DisplayString>{ vars_size() }</DisplayString>
+				<Expand>
+					<IndexListItems>
+						<Size>vars_size()</Size>
+						<ValueNode>vars.ctx.packed.first_base::value[$i].element.second</ValueNode>
+					</IndexListItems>
+				</Expand>
+			</Synthetic>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_sparse_set&lt;*&gt;">
+		<DisplayString>{{ size={ packed.size() }, type={ info->alias,na } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" ExcludeView="simple">packed.capacity()</Item>
+			<Item Name="[policy]">mode,en</Item>
+			<Synthetic Name="[sparse]">
+				<DisplayString>{ sparse.size() * entity_traits::page_size }</DisplayString>
+				<Expand>
+					<ExpandedItem IncludeView="simple">sparse,view(simple)</ExpandedItem>
+					<CustomListItems ExcludeView="simple">
+						<Variable Name="pos" InitialValue="0"/>
+						<Variable Name="page" InitialValue="0"/>
+						<Variable Name="offset" InitialValue="0"/>
+						<Variable Name="last" InitialValue="sparse.size() * entity_traits::page_size"/>
+						<Loop>
+							<Break Condition="pos == last"/>
+							<Exec>page = pos / entity_traits::page_size</Exec>
+							<Exec>offset = pos &amp; (entity_traits::page_size - 1)</Exec>
+							<If Condition="sparse[page] &amp;&amp; (*((entity_traits::entity_type *)&amp;sparse[page][offset]) &lt; ~entity_traits::entity_mask)">
+								<Item Name="[{ pos }]">*((entity_traits::entity_type *)&amp;sparse[page][offset]) &amp; entity_traits::entity_mask</Item>
+							</If>
+							<Exec>++pos</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+			<Synthetic Name="[packed]">
+				<DisplayString>{ packed.size() }</DisplayString>
+				<Expand>
+					<ExpandedItem IncludeView="simple">packed,view(simple)</ExpandedItem>
+					<CustomListItems ExcludeView="simple">
+						<Variable Name="pos" InitialValue="0"/>
+						<Variable Name="last" InitialValue="packed.size()"/>
+						<Loop>
+							<Break Condition="pos == last"/>
+							<If Condition="*((entity_traits::entity_type *)&amp;packed[pos]) &lt; ~entity_traits::entity_mask">
+								<Item Name="[{ pos }]">packed[pos]</Item>
+							</If>
+							<Exec>++pos</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_storage&lt;*&gt;">
+		<DisplayString>{{ size={ base_type::packed.size() }, type={ base_type::info->alias,na } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" Optional="true" ExcludeView="simple">packed.first_base::value.capacity() * comp_traits::page_size</Item>
+			<Item Name="[page size]" Optional="true" ExcludeView="simple">comp_traits::page_size</Item>
+			<Item Name="[base]" ExcludeView="simple">(base_type*)this,nand</Item>
+			<Item Name="[base]" IncludeView="simple">(base_type*)this,view(simple)nand</Item>
+			<!-- having SFINAE-like techniques in natvis is priceless :) -->
+			<CustomListItems Condition="packed.first_base::value.size() != 0" Optional="true">
+				<Variable Name="pos" InitialValue="0" />
+				<Variable Name="last" InitialValue="base_type::packed.size()"/>
+				<Loop>
+					<Break Condition="pos == last"/>
+					<If Condition="*((base_type::entity_traits::entity_type *)&amp;base_type::packed[pos]) &lt; ~base_type::entity_traits::entity_mask">
+						<Item Name="[{ pos }:{ base_type::packed[pos] }]">packed.first_base::value[pos / comp_traits::page_size][pos &amp; (comp_traits::page_size - 1)]</Item>
+					</If>
+					<Exec>++pos</Exec>
+				</Loop>
+			</CustomListItems>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_view&lt;*&gt;">
+		<DisplayString>{{ size_hint={ view->packed.size() } }}</DisplayString>
+		<Expand>
+			<Item Name="[pools]">pools,na</Item>
+			<Item Name="[filter]">filter,na</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_runtime_view&lt;*&gt;">
+		<DisplayString Condition="pools.size() != 0u">{{ size_hint={ pools[0]->packed.size() } }}</DisplayString>
+		<DisplayString>{{ size_hint=0 }}</DisplayString>
+		<Expand>
+			<Item Name="[pools]">pools,na</Item>
+			<Item Name="[filter]">filter,na</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::null_t">
+		<DisplayString>&lt;null&gt;</DisplayString>
+	</Type>
+	<Type Name="entt::tombstone_t">
+		<DisplayString>&lt;tombstone&gt;</DisplayString>
+	</Type>
+</AutoVisualizer>

external/entt/entt/natvis/entt/graph.natvis

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+    <Type Name="entt::adjacency_matrix&lt;*&gt;">
+		<DisplayString>{{ size={ vert } }}</DisplayString>
+        <Expand>
+			<CustomListItems>
+				<Variable Name="pos" InitialValue="0" />
+				<Variable Name="last" InitialValue="vert * vert"/>
+				<Loop>
+					<Break Condition="pos == last"/>
+					<If Condition="matrix[pos] != 0u">
+						<Item Name="{pos / vert}">pos % vert</Item>
+					</If>
+					<Exec>++pos</Exec>
+				</Loop>
+			</CustomListItems>
+        </Expand>
+    </Type>
+</AutoVisualizer>

external/entt/entt/natvis/entt/locator.natvis

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>

external/entt/entt/natvis/entt/meta.natvis

@@ -0,0 +1,121 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::internal::meta_base_node">
+		<DisplayString>{{}}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_conv_node">
+		<DisplayString>{{}}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_ctor_node">
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_data_node">
+		<Intrinsic Name="has_property" Expression="!!(traits &amp; property)">
+			<Parameter Name="property" Type="int"/>
+		</Intrinsic>
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+		<Expand>
+			<Item Name="[arity]">arity</Item>
+			<Item Name="[is_const]">has_property(entt::internal::meta_traits::is_const)</Item>
+			<Item Name="[is_static]">has_property(entt::internal::meta_traits::is_static)</Item>
+			<Item Name="[prop]">prop</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::internal::meta_func_node"	>
+		<Intrinsic Name="has_property" Expression="!!(traits &amp; property)">
+			<Parameter Name="property" Type="int"/>
+		</Intrinsic>
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+		<Expand>
+			<Item Name="[is_const]">has_property(entt::internal::meta_traits::is_const)</Item>
+			<Item Name="[is_static]">has_property(entt::internal::meta_traits::is_static)</Item>
+			<Item Name="[next]" Condition="next != nullptr">*next</Item>
+			<Item Name="[prop]">prop</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::internal::meta_prop_node">
+		<DisplayString>{ value }</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_template_node">
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_type_node">
+		<Intrinsic Name="has_property" Expression="!!(traits &amp; property)">
+			<Parameter Name="property" Type="int"/>
+		</Intrinsic>
+		<DisplayString Condition="info != nullptr">{{ type={ info->alias,na } }}</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<Item Name="[id]">id</Item>
+			<Item Name="[sizeof]">size_of</Item>
+			<Item Name="[is_arithmetic]">has_property(entt::internal::meta_traits::is_arithmetic)</Item>
+			<Item Name="[is_integral]">has_property(entt::internal::meta_traits::is_integral)</Item>
+			<Item Name="[is_signed]">has_property(entt::internal::meta_traits::is_signed)</Item>
+			<Item Name="[is_array]">has_property(entt::internal::meta_traits::is_array)</Item>
+			<Item Name="[is_enum]">has_property(entt::internal::meta_traits::is_enum)</Item>
+			<Item Name="[is_class]">has_property(entt::internal::meta_traits::is_class)</Item>
+			<Item Name="[is_meta_pointer_like]">has_property(entt::internal::meta_traits::is_meta_pointer_like)</Item>
+			<Item Name="[is_meta_sequence_container]">has_property(entt::internal::meta_traits::is_meta_sequence_container)</Item>
+			<Item Name="[is_meta_associative_container]">has_property(entt::internal::meta_traits::is_meta_associative_container)</Item>
+			<Item Name="[default_constructor]">default_constructor != nullptr</Item>
+			<Item Name="[conversion_helper]">conversion_helper != nullptr</Item>
+			<Item Name="[from_void]">from_void != nullptr</Item>
+			<Item Name="[template_info]">templ</Item>
+			<Item Name="[details]" Condition="details != nullptr">*details</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_any">
+		<DisplayString Condition="node.info != nullptr">{{ type={ node.info->alias,na }, policy={ storage.mode,en } }}</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem>node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_handle">
+		<DisplayString>{ any }</DisplayString>
+	</Type>
+	<Type Name="entt::meta_associative_container">
+		<DisplayString>{ storage }</DisplayString>
+		<Expand>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_sequence_container">
+		<DisplayString>{ storage }</DisplayString>
+		<Expand>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_data">
+		<DisplayString Condition="node != nullptr">{ *node }</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem Condition="node != nullptr">node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_func">
+		<DisplayString Condition="node != nullptr">{ *node }</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem Condition="node != nullptr">node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_prop">
+		<DisplayString Condition="node != nullptr">{ *node }</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem Condition="node != nullptr">node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_type">
+		<DisplayString>{ node }</DisplayString>
+		<Expand>
+			<ExpandedItem>node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+</AutoVisualizer>

external/entt/entt/natvis/entt/platform.natvis

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>

external/entt/entt/natvis/entt/poly.natvis

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::basic_poly&lt;*&gt;">
+		<DisplayString>{ storage }</DisplayString>
+	</Type>
+</AutoVisualizer>

external/entt/entt/natvis/entt/process.natvis

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>

external/entt/entt/natvis/entt/resource.natvis

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::resource&lt;*&gt;">
+		<DisplayString>{ value }</DisplayString>
+		<Expand>
+			<ExpandedItem>value</ExpandedItem>
+		</Expand>
+	</Type>
+	<Type Name="entt::resource_cache&lt;*&gt;">
+		<DisplayString>{ pool.first_base::value }</DisplayString>
+		<Expand>
+			<ExpandedItem>pool.first_base::value</ExpandedItem>
+		</Expand>
+	</Type>
+</AutoVisualizer>

external/entt/entt/natvis/entt/signal.natvis

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::delegate&lt;*&gt;">
+		<DisplayString>{{ type={ "$T1" } }}</DisplayString>
+		<Expand>
+			<Item Name="[empty]">fn == nullptr</Item>
+			<Item Name="[data]">instance</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_dispatcher&lt;*&gt;">
+		<Intrinsic Name="size" Expression="pools.first_base::value.packed.first_base::value.size()"/>
+		<DisplayString>{{ size={ size() } }}</DisplayString>
+		<Expand>
+			<Synthetic Name="[pools]">
+				<DisplayString>{ size() }</DisplayString>
+				<Expand>
+					<IndexListItems>
+						<Size>size()</Size>
+						<ValueNode>*pools.first_base::value.packed.first_base::value[$i].element.second</ValueNode>
+					</IndexListItems>
+				</Expand>
+			</Synthetic>
+		</Expand>
+	</Type>
+	<Type Name="entt::internal::dispatcher_handler&lt;*&gt;">
+		<DisplayString>{{ size={ events.size() }, event={ "$T1" } }}</DisplayString>
+		<Expand>
+			<Item Name="[signal]">signal</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::emitter&lt;*&gt;">
+		<DisplayString>{{ size={ handlers.first_base::value.packed.first_base::value.size() } }}</DisplayString>
+	</Type>
+	<Type Name="entt::connection">
+		<DisplayString>{{ bound={ signal != nullptr } }}</DisplayString>
+	</Type>
+	<Type Name="entt::scoped_connection">
+		<DisplayString>{ conn }</DisplayString>
+	</Type>
+	<Type Name="entt::sigh&lt;*&gt;">
+		<DisplayString>{{ size={ calls.size() }, type={ "$T1" } }}</DisplayString>
+		<Expand>
+			<IndexListItems>
+				<Size>calls.size()</Size>
+				<ValueNode>calls[$i]</ValueNode>
+			</IndexListItems>
+		</Expand>
+	</Type>
+	<Type Name="entt::sink&lt;*&gt;">
+		<DisplayString>{{ type={ "$T1" } }}</DisplayString>
+		<Expand>
+			<Item Name="[signal]">signal,na</Item>
+			<Item Name="[offset]">offset</Item>
+		</Expand>
+	</Type>
+</AutoVisualizer>

external/entt/entt/scripts/amalgamate.py

@@ -0,0 +1,299 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+# amalgamate.py - Amalgamate C source and header files.
+# Copyright (c) 2012, Erik Edlund <erik.edlund@32767.se>
+# 
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+# 
+#  * Redistributions of source code must retain the above copyright notice,
+#  this list of conditions and the following disclaimer.
+# 
+#  * Redistributions in binary form must reproduce the above copyright notice,
+#  this list of conditions and the following disclaimer in the documentation
+#  and/or other materials provided with the distribution.
+# 
+#  * Neither the name of Erik Edlund, nor the names of its contributors may
+#  be used to endorse or promote products derived from this software without
+#  specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import argparse
+import datetime
+import json
+import os
+import re
+
+
+class Amalgamation(object):
+
+    # Prepends self.source_path to file_path if needed.
+    def actual_path(self, file_path):
+        if not os.path.isabs(file_path):
+            file_path = os.path.join(self.source_path, file_path)
+        return file_path
+
+    # Search included file_path in self.include_paths and
+    # in source_dir if specified.
+    def find_included_file(self, file_path, source_dir):
+        search_dirs = self.include_paths[:]
+        if source_dir:
+            search_dirs.insert(0, source_dir)
+
+        for search_dir in search_dirs:
+            search_path = os.path.join(search_dir, file_path)
+            if os.path.isfile(self.actual_path(search_path)):
+                return search_path
+        return None
+
+    def __init__(self, args):
+        with open(args.config, 'r') as f:
+            config = json.loads(f.read())
+            for key in config:
+                setattr(self, key, config[key])
+
+            self.verbose = args.verbose == "yes"
+            self.prologue = args.prologue
+            self.source_path = args.source_path
+            self.included_files = []
+
+    # Generate the amalgamation and write it to the target file.
+    def generate(self):
+        amalgamation = ""
+
+        if self.prologue:
+            with open(self.prologue, 'r') as f:
+                amalgamation += datetime.datetime.now().strftime(f.read())
+
+        if self.verbose:
+            print("Config:")
+            print(" target        = {0}".format(self.target))
+            print(" working_dir   = {0}".format(os.getcwd()))
+            print(" include_paths = {0}".format(self.include_paths))
+        print("Creating amalgamation:")
+        for file_path in self.sources:
+            # Do not check the include paths while processing the source
+            # list, all given source paths must be correct.
+            # actual_path = self.actual_path(file_path)
+            print(" - processing \"{0}\"".format(file_path))
+            t = TranslationUnit(file_path, self, True)
+            amalgamation += t.content
+
+        with open(self.target, 'w') as f:
+            f.write(amalgamation)
+
+        print("...done!\n")
+        if self.verbose:
+            print("Files processed: {0}".format(self.sources))
+            print("Files included: {0}".format(self.included_files))
+        print("")
+
+
+def _is_within(match, matches):
+    for m in matches:
+        if match.start() > m.start() and \
+                match.end() < m.end():
+            return True
+    return False
+
+
+class TranslationUnit(object):
+    # // C++ comment.
+    cpp_comment_pattern = re.compile(r"//.*?\n")
+
+    # /* C comment. */
+    c_comment_pattern = re.compile(r"/\*.*?\*/", re.S)
+
+    # "complex \"stri\\\ng\" value".
+    string_pattern = re.compile("[^']" r'".*?(?<=[^\\])"', re.S)
+
+    # Handle simple include directives. Support for advanced
+    # directives where macros and defines needs to expanded is
+    # not a concern right now.
+    include_pattern = re.compile(
+        r'#\s*include\s+(<|")(?P<path>.*?)("|>)', re.S)
+
+    # #pragma once
+    pragma_once_pattern = re.compile(r'#\s*pragma\s+once', re.S)
+
+    # Search for pattern in self.content, add the match to
+    # contexts if found and update the index accordingly.
+    def _search_content(self, index, pattern, contexts):
+        match = pattern.search(self.content, index)
+        if match:
+            contexts.append(match)
+            return match.end()
+        return index + 2
+
+    # Return all the skippable contexts, i.e., comments and strings
+    def _find_skippable_contexts(self):
+        # Find contexts in the content in which a found include
+        # directive should not be processed.
+        skippable_contexts = []
+
+        # Walk through the content char by char, and try to grab
+        # skippable contexts using regular expressions when found.
+        i = 1
+        content_len = len(self.content)
+        while i < content_len:
+            j = i - 1
+            current = self.content[i]
+            previous = self.content[j]
+
+            if current == '"':
+                # String value.
+                i = self._search_content(j, self.string_pattern,
+                                         skippable_contexts)
+            elif current == '*' and previous == '/':
+                # C style comment.
+                i = self._search_content(j, self.c_comment_pattern,
+                                         skippable_contexts)
+            elif current == '/' and previous == '/':
+                # C++ style comment.
+                i = self._search_content(j, self.cpp_comment_pattern,
+                                         skippable_contexts)
+            else:
+                # Skip to the next char.
+                i += 1
+
+        return skippable_contexts
+
+    # Returns True if the match is within list of other matches
+
+    # Removes pragma once from content
+    def _process_pragma_once(self):
+        content_len = len(self.content)
+        if content_len < len("#include <x>"):
+            return 0
+
+        # Find contexts in the content in which a found include
+        # directive should not be processed.
+        skippable_contexts = self._find_skippable_contexts()
+
+        pragmas = []
+        pragma_once_match = self.pragma_once_pattern.search(self.content)
+        while pragma_once_match:
+            if not _is_within(pragma_once_match, skippable_contexts):
+                pragmas.append(pragma_once_match)
+
+            pragma_once_match = self.pragma_once_pattern.search(self.content,
+                                                                pragma_once_match.end())
+
+        # Handle all collected pragma once directives.
+        prev_end = 0
+        tmp_content = ''
+        for pragma_match in pragmas:
+            tmp_content += self.content[prev_end:pragma_match.start()]
+            prev_end = pragma_match.end()
+        tmp_content += self.content[prev_end:]
+        self.content = tmp_content
+
+    # Include all trivial #include directives into self.content.
+    def _process_includes(self):
+        content_len = len(self.content)
+        if content_len < len("#include <x>"):
+            return 0
+
+        # Find contexts in the content in which a found include
+        # directive should not be processed.
+        skippable_contexts = self._find_skippable_contexts()
+
+        # Search for include directives in the content, collect those
+        # which should be included into the content.
+        includes = []
+        include_match = self.include_pattern.search(self.content)
+        while include_match:
+            if not _is_within(include_match, skippable_contexts):
+                include_path = include_match.group("path")
+                search_same_dir = include_match.group(1) == '"'
+                found_included_path = self.amalgamation.find_included_file(
+                    include_path, self.file_dir if search_same_dir else None)
+                if found_included_path:
+                    includes.append((include_match, found_included_path))
+
+            include_match = self.include_pattern.search(self.content,
+                                                        include_match.end())
+
+        # Handle all collected include directives.
+        prev_end = 0
+        tmp_content = ''
+        for include in includes:
+            include_match, found_included_path = include
+            tmp_content += self.content[prev_end:include_match.start()]
+            tmp_content += "// {0}\n".format(include_match.group(0))
+            if found_included_path not in self.amalgamation.included_files:
+                t = TranslationUnit(found_included_path, self.amalgamation, False)
+                tmp_content += t.content
+            prev_end = include_match.end()
+        tmp_content += self.content[prev_end:]
+        self.content = tmp_content
+
+        return len(includes)
+
+    # Make all content processing
+    def _process(self):
+        if not self.is_root:
+            self._process_pragma_once()
+        self._process_includes()
+
+    def __init__(self, file_path, amalgamation, is_root):
+        self.file_path = file_path
+        self.file_dir = os.path.dirname(file_path)
+        self.amalgamation = amalgamation
+        self.is_root = is_root
+
+        self.amalgamation.included_files.append(self.file_path)
+
+        actual_path = self.amalgamation.actual_path(file_path)
+        if not os.path.isfile(actual_path):
+            raise IOError("File not found: \"{0}\"".format(file_path))
+        with open(actual_path, 'r') as f:
+            self.content = f.read()
+            self._process()
+
+
+def main():
+    description = "Amalgamate C source and header files."
+    usage = " ".join([
+        "amalgamate.py",
+        "[-v]",
+        "-c path/to/config.json",
+        "-s path/to/source/dir",
+        "[-p path/to/prologue.(c|h)]"
+    ])
+    argsparser = argparse.ArgumentParser(
+        description=description, usage=usage)
+
+    argsparser.add_argument("-v", "--verbose", dest="verbose",
+                            choices=["yes", "no"], metavar="", help="be verbose")
+
+    argsparser.add_argument("-c", "--config", dest="config",
+                            required=True, metavar="", help="path to a JSON config file")
+
+    argsparser.add_argument("-s", "--source", dest="source_path",
+                            required=True, metavar="", help="source code path")
+
+    argsparser.add_argument("-p", "--prologue", dest="prologue",
+                            required=False, metavar="", help="path to a C prologue file")
+
+    amalgamation = Amalgamation(argsparser.parse_args())
+    amalgamation.generate()
+
+
+if __name__ == "__main__":
+    main()

external/entt/entt/scripts/config.json

@@ -0,0 +1,8 @@
+{
+	"project": "entt",
+	"target": "single_include/entt/entt.hpp",
+	"sources": [
+		"src/entt/entt.hpp"
+	],
+	"include_paths": ["src"]
+}

external/entt/entt/scripts/update_homebrew.sh

@@ -0,0 +1,60 @@
+#!/bin/sh
+
+# only argument should be the version to upgrade to
+if [ $# != 1 ]
+then
+  echo "Expected a version tag like v2.7.1"
+  exit 1
+fi
+
+VERSION="$1"
+URL="https://github.com/skypjack/entt/archive/$VERSION.tar.gz"
+FORMULA="entt.rb"
+
+echo "Updating homebrew package to $VERSION"
+
+echo "Cloning..."
+git clone https://github.com/skypjack/homebrew-entt.git
+if [ $? != 0 ]
+then
+  exit 1
+fi
+cd homebrew-entt
+
+# download the repo at the version
+# exit with error messages if curl fails
+echo "Curling..."
+curl "$URL" --location --fail --silent --show-error --output archive.tar.gz
+if [ $? != 0 ]
+then
+  exit 1
+fi
+
+# compute sha256 hash
+echo "Hashing..."
+HASH="$(openssl sha256 archive.tar.gz | cut -d " " -f 2)"
+
+# delete the archive
+rm archive.tar.gz
+
+echo "Sedding..."
+
+# change the url in the formula file
+# the slashes in the URL must be escaped
+ESCAPED_URL="$(echo "$URL" | sed -e 's/[\/&]/\\&/g')"
+sed -i -e '/url/s/".*"/"'$ESCAPED_URL'"/' $FORMULA
+
+# change the hash in the formula file
+sed -i -e '/sha256/s/".*"/"'$HASH'"/' $FORMULA
+
+# delete temporary file created by sed
+rm -rf "$FORMULA-e"
+
+# update remote repo
+echo "Gitting..."
+git add entt.rb
+git commit -m "Update to $VERSION"
+git push origin master
+
+# out of homebrew-entt dir
+cd ..

external/entt/entt/src/entt/config/config.h

@@ -0,0 +1,81 @@
+#ifndef ENTT_CONFIG_CONFIG_H
+#define ENTT_CONFIG_CONFIG_H
+
+#include "version.h"
+
+#if defined(__cpp_exceptions) && !defined(ENTT_NOEXCEPTION)
+#    define ENTT_CONSTEXPR
+#    define ENTT_THROW throw
+#    define ENTT_TRY try
+#    define ENTT_CATCH catch(...)
+#else
+#    define ENTT_CONSTEXPR constexpr // use only with throwing functions (waiting for C++20)
+#    define ENTT_THROW
+#    define ENTT_TRY if(true)
+#    define ENTT_CATCH if(false)
+#endif
+
+#ifdef ENTT_USE_ATOMIC
+#    include <atomic>
+#    define ENTT_MAYBE_ATOMIC(Type) std::atomic<Type>
+#else
+#    define ENTT_MAYBE_ATOMIC(Type) Type
+#endif
+
+#ifndef ENTT_ID_TYPE
+#    include <cstdint>
+#    define ENTT_ID_TYPE std::uint32_t
+#endif
+
+#ifndef ENTT_SPARSE_PAGE
+#    define ENTT_SPARSE_PAGE 4096
+#endif
+
+#ifndef ENTT_PACKED_PAGE
+#    define ENTT_PACKED_PAGE 1024
+#endif
+
+#ifdef ENTT_DISABLE_ASSERT
+#    undef ENTT_ASSERT
+#    define ENTT_ASSERT(condition, msg) (void(0))
+#elif !defined ENTT_ASSERT
+#    include <cassert>
+#    define ENTT_ASSERT(condition, msg) assert(condition)
+#endif
+
+#ifdef ENTT_DISABLE_ASSERT
+#    undef ENTT_ASSERT_CONSTEXPR
+#    define ENTT_ASSERT_CONSTEXPR(condition, msg) (void(0))
+#elif !defined ENTT_ASSERT_CONSTEXPR
+#    define ENTT_ASSERT_CONSTEXPR(condition, msg) ENTT_ASSERT(condition, msg)
+#endif
+
+#ifdef ENTT_NO_ETO
+#    define ENTT_ETO_TYPE(Type) void
+#else
+#    define ENTT_ETO_TYPE(Type) Type
+#endif
+
+#ifdef ENTT_STANDARD_CPP
+#    define ENTT_NONSTD false
+#else
+#    define ENTT_NONSTD true
+#    if defined __clang__ || defined __GNUC__
+#        define ENTT_PRETTY_FUNCTION __PRETTY_FUNCTION__
+#        define ENTT_PRETTY_FUNCTION_PREFIX '='
+#        define ENTT_PRETTY_FUNCTION_SUFFIX ']'
+#    elif defined _MSC_VER
+#        define ENTT_PRETTY_FUNCTION __FUNCSIG__
+#        define ENTT_PRETTY_FUNCTION_PREFIX '<'
+#        define ENTT_PRETTY_FUNCTION_SUFFIX '>'
+#    endif
+#endif
+
+#if defined _MSC_VER
+#    pragma detect_mismatch("entt.version", ENTT_VERSION)
+#    pragma detect_mismatch("entt.noexcept", ENTT_XSTR(ENTT_TRY))
+#    pragma detect_mismatch("entt.id", ENTT_XSTR(ENTT_ID_TYPE))
+#    pragma detect_mismatch("entt.nonstd", ENTT_XSTR(ENTT_NONSTD))
+#endif
+
+#endif

external/entt/entt/src/entt/config/macro.h

@@ -0,0 +1,7 @@
+#ifndef ENTT_CONFIG_MACRO_H
+#define ENTT_CONFIG_MACRO_H
+
+#define ENTT_STR(arg) #arg
+#define ENTT_XSTR(arg) ENTT_STR(arg)
+
+#endif

external/entt/entt/src/entt/config/version.h

@@ -0,0 +1,14 @@
+#ifndef ENTT_CONFIG_VERSION_H
+#define ENTT_CONFIG_VERSION_H
+
+#include "macro.h"
+
+#define ENTT_VERSION_MAJOR 3
+#define ENTT_VERSION_MINOR 11
+#define ENTT_VERSION_PATCH 1
+
+#define ENTT_VERSION \
+    ENTT_XSTR(ENTT_VERSION_MAJOR) \
+    "." ENTT_XSTR(ENTT_VERSION_MINOR) "." ENTT_XSTR(ENTT_VERSION_PATCH)
+
+#endif

external/entt/entt/src/entt/container/dense_set.hpp

@@ -0,0 +1,895 @@
+#ifndef ENTT_CONTAINER_DENSE_SET_HPP
+#define ENTT_CONTAINER_DENSE_SET_HPP
+
+#include <cmath>
+#include <cstddef>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include <vector>
+#include "../config/config.h"
+#include "../core/compressed_pair.hpp"
+#include "../core/memory.hpp"
+#include "../core/type_traits.hpp"
+#include "fwd.hpp"
+
+namespace entt {
+
+/**
+ * @cond TURN_OFF_DOXYGEN
+ * Internal details not to be documented.
+ */
+
+namespace internal {
+
+template<typename It>
+class dense_set_iterator final {
+    template<typename>
+    friend class dense_set_iterator;
+
+public:
+    using value_type = typename It::value_type::second_type;
+    using pointer = const value_type *;
+    using reference = const value_type &;
+    using difference_type = std::ptrdiff_t;
+    using iterator_category = std::random_access_iterator_tag;
+
+    constexpr dense_set_iterator() noexcept
+        : it{} {}
+
+    constexpr dense_set_iterator(const It iter) noexcept
+        : it{iter} {}
+
+    template<typename Other, typename = std::enable_if_t<!std::is_same_v<It, Other> && std::is_constructible_v<It, Other>>>
+    constexpr dense_set_iterator(const dense_set_iterator<Other> &other) noexcept
+        : it{other.it} {}
+
+    constexpr dense_set_iterator &operator++() noexcept {
+        return ++it, *this;
+    }
+
+    constexpr dense_set_iterator operator++(int) noexcept {
+        dense_set_iterator orig = *this;
+        return ++(*this), orig;
+    }
+
+    constexpr dense_set_iterator &operator--() noexcept {
+        return --it, *this;
+    }
+
+    constexpr dense_set_iterator operator--(int) noexcept {
+        dense_set_iterator orig = *this;
+        return operator--(), orig;
+    }
+
+    constexpr dense_set_iterator &operator+=(const difference_type value) noexcept {
+        it += value;
+        return *this;
+    }
+
+    constexpr dense_set_iterator operator+(const difference_type value) const noexcept {
+        dense_set_iterator copy = *this;
+        return (copy += value);
+    }
+
+    constexpr dense_set_iterator &operator-=(const difference_type value) noexcept {
+        return (*this += -value);
+    }
+
+    constexpr dense_set_iterator operator-(const difference_type value) const noexcept {
+        return (*this + -value);
+    }
+
+    [[nodiscard]] constexpr reference operator[](const difference_type value) const noexcept {
+        return it[value].second;
+    }
+
+    [[nodiscard]] constexpr pointer operator->() const noexcept {
+        return std::addressof(it->second);
+    }
+
+    [[nodiscard]] constexpr reference operator*() const noexcept {
+        return *operator->();
+    }
+
+    template<typename ILhs, typename IRhs>
+    friend constexpr std::ptrdiff_t operator-(const dense_set_iterator<ILhs> &, const dense_set_iterator<IRhs> &) noexcept;
+
+    template<typename ILhs, typename IRhs>
+    friend constexpr bool operator==(const dense_set_iterator<ILhs> &, const dense_set_iterator<IRhs> &) noexcept;
+
+    template<typename ILhs, typename IRhs>
+    friend constexpr bool operator<(const dense_set_iterator<ILhs> &, const dense_set_iterator<IRhs> &) noexcept;
+
+private:
+    It it;
+};
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr std::ptrdiff_t operator-(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return lhs.it - rhs.it;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator==(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return lhs.it == rhs.it;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator!=(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return !(lhs == rhs);
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator<(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return lhs.it < rhs.it;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator>(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return rhs < lhs;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator<=(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return !(lhs > rhs);
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator>=(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return !(lhs < rhs);
+}
+
+template<typename It>
+class dense_set_local_iterator final {
+    template<typename>
+    friend class dense_set_local_iterator;
+
+public:
+    using value_type = typename It::value_type::second_type;
+    using pointer = const value_type *;
+    using reference = const value_type &;
+    using difference_type = std::ptrdiff_t;
+    using iterator_category = std::forward_iterator_tag;
+
+    constexpr dense_set_local_iterator() noexcept
+        : it{},
+          offset{} {}
+
+    constexpr dense_set_local_iterator(It iter, const std::size_t pos) noexcept
+        : it{iter},
+          offset{pos} {}
+
+    template<typename Other, typename = std::enable_if_t<!std::is_same_v<It, Other> && std::is_constructible_v<It, Other>>>
+    constexpr dense_set_local_iterator(const dense_set_local_iterator<Other> &other) noexcept
+        : it{other.it},
+          offset{other.offset} {}
+
+    constexpr dense_set_local_iterator &operator++() noexcept {
+        return offset = it[offset].first, *this;
+    }
+
+    constexpr dense_set_local_iterator operator++(int) noexcept {
+        dense_set_local_iterator orig = *this;
+        return ++(*this), orig;
+    }
+
+    [[nodiscard]] constexpr pointer operator->() const noexcept {
+        return std::addressof(it[offset].second);
+    }
+
+    [[nodiscard]] constexpr reference operator*() const noexcept {
+        return *operator->();
+    }
+
+    [[nodiscard]] constexpr std::size_t index() const noexcept {
+        return offset;
+    }
+
+private:
+    It it;
+    std::size_t offset;
+};
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator==(const dense_set_local_iterator<ILhs> &lhs, const dense_set_local_iterator<IRhs> &rhs) noexcept {
+    return lhs.index() == rhs.index();
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator!=(const dense_set_local_iterator<ILhs> &lhs, const dense_set_local_iterator<IRhs> &rhs) noexcept {
+    return !(lhs == rhs);
+}
+
+} // namespace internal
+
+/**
+ * Internal details not to be documented.
+ * @endcond
+ */
+
+/**
+ * @brief Associative container for unique objects of a given type.
+ *
+ * Internally, elements are organized into buckets. Which bucket an element is
+ * placed into depends entirely on its hash. Elements with the same hash code
+ * appear in the same bucket.
+ *
+ * @tparam Type Value type of the associative container.
+ * @tparam Hash Type of function to use to hash the values.
+ * @tparam KeyEqual Type of function to use to compare the values for equality.
+ * @tparam Allocator Type of allocator used to manage memory and elements.
+ */
+template<typename Type, typename Hash, typename KeyEqual, typename Allocator>
+class dense_set {
+    static constexpr float default_threshold = 0.875f;
+    static constexpr std::size_t minimum_capacity = 8u;
+
+    using node_type = std::pair<std::size_t, Type>;
+    using alloc_traits = std::allocator_traits<Allocator>;
+    static_assert(std::is_same_v<typename alloc_traits::value_type, Type>, "Invalid value type");
+    using sparse_container_type = std::vector<std::size_t, typename alloc_traits::template rebind_alloc<std::size_t>>;
+    using packed_container_type = std::vector<node_type, typename alloc_traits::template rebind_alloc<node_type>>;
+
+    template<typename Other>
+    [[nodiscard]] std::size_t value_to_bucket(const Other &value) const noexcept {
+        return fast_mod(static_cast<size_type>(sparse.second()(value)), bucket_count());
+    }
+
+    template<typename Other>
+    [[nodiscard]] auto constrained_find(const Other &value, std::size_t bucket) {
+        for(auto it = begin(bucket), last = end(bucket); it != last; ++it) {
+            if(packed.second()(*it, value)) {
+                return begin() + static_cast<typename iterator::difference_type>(it.index());
+            }
+        }
+
+        return end();
+    }
+
+    template<typename Other>
+    [[nodiscard]] auto constrained_find(const Other &value, std::size_t bucket) const {
+        for(auto it = cbegin(bucket), last = cend(bucket); it != last; ++it) {
+            if(packed.second()(*it, value)) {
+                return cbegin() + static_cast<typename iterator::difference_type>(it.index());
+            }
+        }
+
+        return cend();
+    }
+
+    template<typename Other>
+    [[nodiscard]] auto insert_or_do_nothing(Other &&value) {
+        const auto index = value_to_bucket(value);
+
+        if(auto it = constrained_find(value, index); it != end()) {
+            return std::make_pair(it, false);
+        }
+
+        packed.first().emplace_back(sparse.first()[index], std::forward<Other>(value));
+        sparse.first()[index] = packed.first().size() - 1u;
+        rehash_if_required();
+
+        return std::make_pair(--end(), true);
+    }
+
+    void move_and_pop(const std::size_t pos) {
+        if(const auto last = size() - 1u; pos != last) {
+            size_type *curr = sparse.first().data() + value_to_bucket(packed.first().back().second);
+            packed.first()[pos] = std::move(packed.first().back());
+            for(; *curr != last; curr = &packed.first()[*curr].first) {}
+            *curr = pos;
+        }
+
+        packed.first().pop_back();
+    }
+
+    void rehash_if_required() {
+        if(size() > (bucket_count() * max_load_factor())) {
+            rehash(bucket_count() * 2u);
+        }
+    }
+
+public:
+    /*! @brief Key type of the container. */
+    using key_type = Type;
+    /*! @brief Value type of the container. */
+    using value_type = Type;
+    /*! @brief Unsigned integer type. */
+    using size_type = std::size_t;
+    /*! @brief Type of function to use to hash the elements. */
+    using hasher = Hash;
+    /*! @brief Type of function to use to compare the elements for equality. */
+    using key_equal = KeyEqual;
+    /*! @brief Allocator type. */
+    using allocator_type = Allocator;
+    /*! @brief Random access iterator type. */
+    using iterator = internal::dense_set_iterator<typename packed_container_type::iterator>;
+    /*! @brief Constant random access iterator type. */
+    using const_iterator = internal::dense_set_iterator<typename packed_container_type::const_iterator>;
+    /*! @brief Forward iterator type. */
+    using local_iterator = internal::dense_set_local_iterator<typename packed_container_type::iterator>;
+    /*! @brief Constant forward iterator type. */
+    using const_local_iterator = internal::dense_set_local_iterator<typename packed_container_type::const_iterator>;
+
+    /*! @brief Default constructor. */
+    dense_set()
+        : dense_set{minimum_capacity} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator.
+     * @param allocator The allocator to use.
+     */
+    explicit dense_set(const allocator_type &allocator)
+        : dense_set{minimum_capacity, hasher{}, key_equal{}, allocator} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator and user
+     * supplied minimal number of buckets.
+     * @param cnt Minimal number of buckets.
+     * @param allocator The allocator to use.
+     */
+    dense_set(const size_type cnt, const allocator_type &allocator)
+        : dense_set{cnt, hasher{}, key_equal{}, allocator} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator, hash
+     * function and user supplied minimal number of buckets.
+     * @param cnt Minimal number of buckets.
+     * @param hash Hash function to use.
+     * @param allocator The allocator to use.
+     */
+    dense_set(const size_type cnt, const hasher &hash, const allocator_type &allocator)
+        : dense_set{cnt, hash, key_equal{}, allocator} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator, hash
+     * function, compare function and user supplied minimal number of buckets.
+     * @param cnt Minimal number of buckets.
+     * @param hash Hash function to use.
+     * @param equal Compare function to use.
+     * @param allocator The allocator to use.
+     */
+    explicit dense_set(const size_type cnt, const hasher &hash = hasher{}, const key_equal &equal = key_equal{}, const allocator_type &allocator = allocator_type{})
+        : sparse{allocator, hash},
+          packed{allocator, equal},
+          threshold{default_threshold} {
+        rehash(cnt);
+    }
+
+    /*! @brief Default copy constructor. */
+    dense_set(const dense_set &) = default;
+
+    /**
+     * @brief Allocator-extended copy constructor.
+     * @param other The instance to copy from.
+     * @param allocator The allocator to use.
+     */
+    dense_set(const dense_set &other, const allocator_type &allocator)
+        : sparse{std::piecewise_construct, std::forward_as_tuple(other.sparse.first(), allocator), std::forward_as_tuple(other.sparse.second())},
+          packed{std::piecewise_construct, std::forward_as_tuple(other.packed.first(), allocator), std::forward_as_tuple(other.packed.second())},
+          threshold{other.threshold} {}
+
+    /*! @brief Default move constructor. */
+    dense_set(dense_set &&) noexcept(std::is_nothrow_move_constructible_v<compressed_pair<sparse_container_type, hasher>> &&std::is_nothrow_move_constructible_v<compressed_pair<packed_container_type, key_equal>>) = default;
+
+    /**
+     * @brief Allocator-extended move constructor.
+     * @param other The instance to move from.
+     * @param allocator The allocator to use.
+     */
+    dense_set(dense_set &&other, const allocator_type &allocator)
+        : sparse{std::piecewise_construct, std::forward_as_tuple(std::move(other.sparse.first()), allocator), std::forward_as_tuple(std::move(other.sparse.second()))},
+          packed{std::piecewise_construct, std::forward_as_tuple(std::move(other.packed.first()), allocator), std::forward_as_tuple(std::move(other.packed.second()))},
+          threshold{other.threshold} {}
+
+    /**
+     * @brief Default copy assignment operator.
+     * @return This container.
+     */
+    dense_set &operator=(const dense_set &) = default;
+
+    /**
+     * @brief Default move assignment operator.
+     * @return This container.
+     */
+    dense_set &operator=(dense_set &&) noexcept(std::is_nothrow_move_assignable_v<compressed_pair<sparse_container_type, hasher>> &&std::is_nothrow_move_assignable_v<compressed_pair<packed_container_type, key_equal>>) = default;
+
+    /**
+     * @brief Returns the associated allocator.
+     * @return The associated allocator.
+     */
+    [[nodiscard]] constexpr allocator_type get_allocator() const noexcept {
+        return sparse.first().get_allocator();
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning.
+     *
+     * The returned iterator points to the first instance of the internal array.
+     * If the array is empty, the returned iterator will be equal to `end()`.
+     *
+     * @return An iterator to the first instance of the internal array.
+     */
+    [[nodiscard]] const_iterator cbegin() const noexcept {
+        return packed.first().begin();
+    }
+
+    /*! @copydoc cbegin */
+    [[nodiscard]] const_iterator begin() const noexcept {
+        return cbegin();
+    }
+
+    /*! @copydoc begin */
+    [[nodiscard]] iterator begin() noexcept {
+        return packed.first().begin();
+    }
+
+    /**
+     * @brief Returns an iterator to the end.
+     *
+     * The returned iterator points to the element following the last instance
+     * of the internal array. Attempting to dereference the returned iterator
+     * results in undefined behavior.
+     *
+     * @return An iterator to the element following the last instance of the
+     * internal array.
+     */
+    [[nodiscard]] const_iterator cend() const noexcept {
+        return packed.first().end();
+    }
+
+    /*! @copydoc cend */
+    [[nodiscard]] const_iterator end() const noexcept {
+        return cend();
+    }
+
+    /*! @copydoc end */
+    [[nodiscard]] iterator end() noexcept {
+        return packed.first().end();
+    }
+
+    /**
+     * @brief Checks whether a container is empty.
+     * @return True if the container is empty, false otherwise.
+     */
+    [[nodiscard]] bool empty() const noexcept {
+        return packed.first().empty();
+    }
+
+    /**
+     * @brief Returns the number of elements in a container.
+     * @return Number of elements in a container.
+     */
+    [[nodiscard]] size_type size() const noexcept {
+        return packed.first().size();
+    }
+
+    /**
+     * @brief Returns the maximum possible number of elements.
+     * @return Maximum possible number of elements.
+     */
+    [[nodiscard]] size_type max_size() const noexcept {
+        return packed.first().max_size();
+    }
+
+    /*! @brief Clears the container. */
+    void clear() noexcept {
+        sparse.first().clear();
+        packed.first().clear();
+        rehash(0u);
+    }
+
+    /**
+     * @brief Inserts an element into the container, if it does not exist.
+     * @param value An element to insert into the container.
+     * @return A pair consisting of an iterator to the inserted element (or to
+     * the element that prevented the insertion) and a bool denoting whether the
+     * insertion took place.
+     */
+    std::pair<iterator, bool> insert(const value_type &value) {
+        return insert_or_do_nothing(value);
+    }
+
+    /*! @copydoc insert */
+    std::pair<iterator, bool> insert(value_type &&value) {
+        return insert_or_do_nothing(std::move(value));
+    }
+
+    /**
+     * @brief Inserts elements into the container, if they do not exist.
+     * @tparam It Type of input iterator.
+     * @param first An iterator to the first element of the range of elements.
+     * @param last An iterator past the last element of the range of elements.
+     */
+    template<typename It>
+    void insert(It first, It last) {
+        for(; first != last; ++first) {
+            insert(*first);
+        }
+    }
+
+    /**
+     * @brief Constructs an element in-place, if it does not exist.
+     *
+     * The element is also constructed when the container already has the key,
+     * in which case the newly constructed object is destroyed immediately.
+     *
+     * @tparam Args Types of arguments to forward to the constructor of the
+     * element.
+     * @param args Arguments to forward to the constructor of the element.
+     * @return A pair consisting of an iterator to the inserted element (or to
+     * the element that prevented the insertion) and a bool denoting whether the
+     * insertion took place.
+     */
+    template<typename... Args>
+    std::pair<iterator, bool> emplace(Args &&...args) {
+        if constexpr(((sizeof...(Args) == 1u) && ... && std::is_same_v<std::decay_t<Args>, value_type>)) {
+            return insert_or_do_nothing(std::forward<Args>(args)...);
+        } else {
+            auto &node = packed.first().emplace_back(std::piecewise_construct, std::make_tuple(packed.first().size()), std::forward_as_tuple(std::forward<Args>(args)...));
+            const auto index = value_to_bucket(node.second);
+
+            if(auto it = constrained_find(node.second, index); it != end()) {
+                packed.first().pop_back();
+                return std::make_pair(it, false);
+            }
+
+            std::swap(node.first, sparse.first()[index]);
+            rehash_if_required();
+
+            return std::make_pair(--end(), true);
+        }
+    }
+
+    /**
+     * @brief Removes an element from a given position.
+     * @param pos An iterator to the element to remove.
+     * @return An iterator following the removed element.
+     */
+    iterator erase(const_iterator pos) {
+        const auto diff = pos - cbegin();
+        erase(*pos);
+        return begin() + diff;
+    }
+
+    /**
+     * @brief Removes the given elements from a container.
+     * @param first An iterator to the first element of the range of elements.
+     * @param last An iterator past the last element of the range of elements.
+     * @return An iterator following the last removed element.
+     */
+    iterator erase(const_iterator first, const_iterator last) {
+        const auto dist = first - cbegin();
+
+        for(auto from = last - cbegin(); from != dist; --from) {
+            erase(packed.first()[from - 1u].second);
+        }
+
+        return (begin() + dist);
+    }
+
+    /**
+     * @brief Removes the element associated with a given value.
+     * @param value Value of an element to remove.
+     * @return Number of elements removed (either 0 or 1).
+     */
+    size_type erase(const value_type &value) {
+        for(size_type *curr = sparse.first().data() + value_to_bucket(value); *curr != (std::numeric_limits<size_type>::max)(); curr = &packed.first()[*curr].first) {
+            if(packed.second()(packed.first()[*curr].second, value)) {
+                const auto index = *curr;
+                *curr = packed.first()[*curr].first;
+                move_and_pop(index);
+                return 1u;
+            }
+        }
+
+        return 0u;
+    }
+
+    /**
+     * @brief Exchanges the contents with those of a given container.
+     * @param other Container to exchange the content with.
+     */
+    void swap(dense_set &other) {
+        using std::swap;
+        swap(sparse, other.sparse);
+        swap(packed, other.packed);
+        swap(threshold, other.threshold);
+    }
+
+    /**
+     * @brief Returns the number of elements matching a value (either 1 or 0).
+     * @param key Key value of an element to search for.
+     * @return Number of elements matching the key (either 1 or 0).
+     */
+    [[nodiscard]] size_type count(const value_type &key) const {
+        return find(key) != end();
+    }
+
+    /**
+     * @brief Returns the number of elements matching a key (either 1 or 0).
+     * @tparam Other Type of the key value of an element to search for.
+     * @param key Key value of an element to search for.
+     * @return Number of elements matching the key (either 1 or 0).
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, size_type>>
+    count(const Other &key) const {
+        return find(key) != end();
+    }
+
+    /**
+     * @brief Finds an element with a given value.
+     * @param value Value of an element to search for.
+     * @return An iterator to an element with the given value. If no such
+     * element is found, a past-the-end iterator is returned.
+     */
+    [[nodiscard]] iterator find(const value_type &value) {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /*! @copydoc find */
+    [[nodiscard]] const_iterator find(const value_type &value) const {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /**
+     * @brief Finds an element that compares _equivalent_ to a given value.
+     * @tparam Other Type of an element to search for.
+     * @param value Value of an element to search for.
+     * @return An iterator to an element with the given value. If no such
+     * element is found, a past-the-end iterator is returned.
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, iterator>>
+    find(const Other &value) {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /*! @copydoc find */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, const_iterator>>
+    find(const Other &value) const {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /**
+     * @brief Returns a range containing all elements with a given value.
+     * @param value Value of an element to search for.
+     * @return A pair of iterators pointing to the first element and past the
+     * last element of the range.
+     */
+    [[nodiscard]] std::pair<iterator, iterator> equal_range(const value_type &value) {
+        const auto it = find(value);
+        return {it, it + !(it == end())};
+    }
+
+    /*! @copydoc equal_range */
+    [[nodiscard]] std::pair<const_iterator, const_iterator> equal_range(const value_type &value) const {
+        const auto it = find(value);
+        return {it, it + !(it == cend())};
+    }
+
+    /**
+     * @brief Returns a range containing all elements that compare _equivalent_
+     * to a given value.
+     * @tparam Other Type of an element to search for.
+     * @param value Value of an element to search for.
+     * @return A pair of iterators pointing to the first element and past the
+     * last element of the range.
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, std::pair<iterator, iterator>>>
+    equal_range(const Other &value) {
+        const auto it = find(value);
+        return {it, it + !(it == end())};
+    }
+
+    /*! @copydoc equal_range */
+    template<class Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, std::pair<const_iterator, const_iterator>>>
+    equal_range(const Other &value) const {
+        const auto it = find(value);
+        return {it, it + !(it == cend())};
+    }
+
+    /**
+     * @brief Checks if the container contains an element with a given value.
+     * @param value Value of an element to search for.
+     * @return True if there is such an element, false otherwise.
+     */
+    [[nodiscard]] bool contains(const value_type &value) const {
+        return (find(value) != cend());
+    }
+
+    /**
+     * @brief Checks if the container contains an element that compares
+     * _equivalent_ to a given value.
+     * @tparam Other Type of an element to search for.
+     * @param value Value of an element to search for.
+     * @return True if there is such an element, false otherwise.
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, bool>>
+    contains(const Other &value) const {
+        return (find(value) != cend());
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the beginning of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator cbegin(const size_type index) const {
+        return {packed.first().begin(), sparse.first()[index]};
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the beginning of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator begin(const size_type index) const {
+        return cbegin(index);
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the beginning of the given bucket.
+     */
+    [[nodiscard]] local_iterator begin(const size_type index) {
+        return {packed.first().begin(), sparse.first()[index]};
+    }
+
+    /**
+     * @brief Returns an iterator to the end of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the end of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator cend([[maybe_unused]] const size_type index) const {
+        return {packed.first().begin(), (std::numeric_limits<size_type>::max)()};
+    }
+
+    /**
+     * @brief Returns an iterator to the end of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the end of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator end(const size_type index) const {
+        return cend(index);
+    }
+
+    /**
+     * @brief Returns an iterator to the end of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the end of the given bucket.
+     */
+    [[nodiscard]] local_iterator end([[maybe_unused]] const size_type index) {
+        return {packed.first().begin(), (std::numeric_limits<size_type>::max)()};
+    }
+
+    /**
+     * @brief Returns the number of buckets.
+     * @return The number of buckets.
+     */
+    [[nodiscard]] size_type bucket_count() const {
+        return sparse.first().size();
+    }
+
+    /**
+     * @brief Returns the maximum number of buckets.
+     * @return The maximum number of buckets.
+     */
+    [[nodiscard]] size_type max_bucket_count() const {
+        return sparse.first().max_size();
+    }
+
+    /**
+     * @brief Returns the number of elements in a given bucket.
+     * @param index The index of the bucket to examine.
+     * @return The number of elements in the given bucket.
+     */
+    [[nodiscard]] size_type bucket_size(const size_type index) const {
+        return static_cast<size_type>(std::distance(begin(index), end(index)));
+    }
+
+    /**
+     * @brief Returns the bucket for a given element.
+     * @param value The value of the element to examine.
+     * @return The bucket for the given element.
+     */
+    [[nodiscard]] size_type bucket(const value_type &value) const {
+        return value_to_bucket(value);
+    }
+
+    /**
+     * @brief Returns the average number of elements per bucket.
+     * @return The average number of elements per bucket.
+     */
+    [[nodiscard]] float load_factor() const {
+        return size() / static_cast<float>(bucket_count());
+    }
+
+    /**
+     * @brief Returns the maximum average number of elements per bucket.
+     * @return The maximum average number of elements per bucket.
+     */
+    [[nodiscard]] float max_load_factor() const {
+        return threshold;
+    }
+
+    /**
+     * @brief Sets the desired maximum average number of elements per bucket.
+     * @param value A desired maximum average number of elements per bucket.
+     */
+    void max_load_factor(const float value) {
+        ENTT_ASSERT(value > 0.f, "Invalid load factor");
+        threshold = value;
+        rehash(0u);
+    }
+
+    /**
+     * @brief Reserves at least the specified number of buckets and regenerates
+     * the hash table.
+     * @param cnt New number of buckets.
+     */
+    void rehash(const size_type cnt) {
+        auto value = cnt > minimum_capacity ? cnt : minimum_capacity;
+        const auto cap = static_cast<size_type>(size() / max_load_factor());
+        value = value > cap ? value : cap;
+
+        if(const auto sz = next_power_of_two(value); sz != bucket_count()) {
+            sparse.first().resize(sz);
+
+            for(auto &&elem: sparse.first()) {
+                elem = std::numeric_limits<size_type>::max();
+            }
+
+            for(size_type pos{}, last = size(); pos < last; ++pos) {
+                const auto index = value_to_bucket(packed.first()[pos].second);
+                packed.first()[pos].first = std::exchange(sparse.first()[index], pos);
+            }
+        }
+    }
+
+    /**
+     * @brief Reserves space for at least the specified number of elements and
+     * regenerates the hash table.
+     * @param cnt New number of elements.
+     */
+    void reserve(const size_type cnt) {
+        packed.first().reserve(cnt);
+        rehash(static_cast<size_type>(std::ceil(cnt / max_load_factor())));
+    }
+
+    /**
+     * @brief Returns the function used to hash the elements.
+     * @return The function used to hash the elements.
+     */
+    [[nodiscard]] hasher hash_function() const {
+        return sparse.second();
+    }
+
+    /**
+     * @brief Returns the function used to compare elements for equality.
+     * @return The function used to compare elements for equality.
+     */
+    [[nodiscard]] key_equal key_eq() const {
+        return packed.second();
+    }
+
+private:
+    compressed_pair<sparse_container_type, hasher> sparse;
+    compressed_pair<packed_container_type, key_equal> packed;
+    float threshold;
+};
+
+} // namespace entt
+
+#endif

external/entt/entt/src/entt/container/fwd.hpp

@@ -0,0 +1,26 @@
+#ifndef ENTT_CONTAINER_FWD_HPP
+#define ENTT_CONTAINER_FWD_HPP
+
+#include <functional>
+#include <memory>
+
+namespace entt {
+
+template<
+    typename Key,
+    typename Type,
+    typename = std::hash<Key>,
+    typename = std::equal_to<Key>,
+    typename = std::allocator<std::pair<const Key, Type>>>
+class dense_map;
+
+template<
+    typename Type,
+    typename = std::hash<Type>,
+    typename = std::equal_to<Type>,
+    typename = std::allocator<Type>>
+class dense_set;
+
+} // namespace entt
+
+#endif

external/entt/entt/src/entt/core/algorithm.hpp

@@ -0,0 +1,137 @@
+#ifndef ENTT_CORE_ALGORITHM_HPP
+#define ENTT_CORE_ALGORITHM_HPP
+
+#include <algorithm>
+#include <functional>
+#include <iterator>
+#include <utility>
+#include <vector>
+#include "utility.hpp"
+
+namespace entt {
+
+/**
+ * @brief Function object to wrap `std::sort` in a class type.
+ *
+ * Unfortunately, `std::sort` cannot be passed as template argument to a class
+ * template or a function template.<br/>
+ * This class fills the gap by wrapping some flavors of `std::sort` in a
+ * function object.
+ */
+struct std_sort {
+    /**
+     * @brief Sorts the elements in a range.
+     *
+     * Sorts the elements in a range using the given binary comparison function.
+     *
+     * @tparam It Type of random access iterator.
+     * @tparam Compare Type of comparison function object.
+     * @tparam Args Types of arguments to forward to the sort function.
+     * @param first An iterator to the first element of the range to sort.
+     * @param last An iterator past the last element of the range to sort.
+     * @param compare A valid comparison function object.
+     * @param args Arguments to forward to the sort function, if any.
+     */
+    template<typename It, typename Compare = std::less<>, typename... Args>
+    void operator()(It first, It last, Compare compare = Compare{}, Args &&...args) const {
+        std::sort(std::forward<Args>(args)..., std::move(first), std::move(last), std::move(compare));
+    }
+};
+
+/*! @brief Function object for performing insertion sort. */
+struct insertion_sort {
+    /**
+     * @brief Sorts the elements in a range.
+     *
+     * Sorts the elements in a range using the given binary comparison function.
+     *
+     * @tparam It Type of random access iterator.
+     * @tparam Compare Type of comparison function object.
+     * @param first An iterator to the first element of the range to sort.
+     * @param last An iterator past the last element of the range to sort.
+     * @param compare A valid comparison function object.
+     */
+    template<typename It, typename Compare = std::less<>>
+    void operator()(It first, It last, Compare compare = Compare{}) const {
+        if(first < last) {
+            for(auto it = first + 1; it < last; ++it) {
+                auto value = std::move(*it);
+                auto pre = it;
+
+                for(; pre > first && compare(value, *(pre - 1)); --pre) {
+                    *pre = std::move(*(pre - 1));
+                }
+
+                *pre = std::move(value);
+            }
+        }
+    }
+};
+
+/**
+ * @brief Function object for performing LSD radix sort.
+ * @tparam Bit Number of bits processed per pass.
+ * @tparam N Maximum number of bits to sort.
+ */
+template<std::size_t Bit, std::size_t N>
+struct radix_sort {
+    static_assert((N % Bit) == 0, "The maximum number of bits to sort must be a multiple of the number of bits processed per pass");
+
+    /**
+     * @brief Sorts the elements in a range.
+     *
+     * Sorts the elements in a range using the given _getter_ to access the
+     * actual data to be sorted.
+     *
+     * This implementation is inspired by the online book
+     * [Physically Based Rendering](http://www.pbr-book.org/3ed-2018/Primitives_and_Intersection_Acceleration/Bounding_Volume_Hierarchies.html#RadixSort).
+     *
+     * @tparam It Type of random access iterator.
+     * @tparam Getter Type of _getter_ function object.
+     * @param first An iterator to the first element of the range to sort.
+     * @param last An iterator past the last element of the range to sort.
+     * @param getter A valid _getter_ function object.
+     */
+    template<typename It, typename Getter = identity>
+    void operator()(It first, It last, Getter getter = Getter{}) const {
+        if(first < last) {
+            static constexpr auto mask = (1 << Bit) - 1;
+            static constexpr auto buckets = 1 << Bit;
+            static constexpr auto passes = N / Bit;
+
+            using value_type = typename std::iterator_traits<It>::value_type;
+            std::vector<value_type> aux(std::distance(first, last));
+
+            auto part = [getter = std::move(getter)](auto from, auto to, auto out, auto start) {
+                std::size_t index[buckets]{};
+                std::size_t count[buckets]{};
+
+                for(auto it = from; it != to; ++it) {
+                    ++count[(getter(*it) >> start) & mask];
+                }
+
+                for(std::size_t pos{}, end = buckets - 1u; pos < end; ++pos) {
+                    index[pos + 1u] = index[pos] + count[pos];
+                }
+
+                for(auto it = from; it != to; ++it) {
+                    out[index[(getter(*it) >> start) & mask]++] = std::move(*it);
+                }
+            };
+
+            for(std::size_t pass = 0; pass < (passes & ~1); pass += 2) {
+                part(first, last, aux.begin(), pass * Bit);
+                part(aux.begin(), aux.end(), first, (pass + 1) * Bit);
+            }
+
+            if constexpr(passes & 1) {
+                part(first, last, aux.begin(), (passes - 1) * Bit);
+                std::move(aux.begin(), aux.end(), first);
+            }
+        }
+    }
+};
+
+} // namespace entt
+
+#endif

external/entt/entt/src/entt/core/any.hpp

@@ -0,0 +1,510 @@
+#ifndef ENTT_CORE_ANY_HPP
+#define ENTT_CORE_ANY_HPP
+
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+#include <utility>
+#include "../config/config.h"
+#include "../core/utility.hpp"
+#include "fwd.hpp"
+#include "type_info.hpp"
+#include "type_traits.hpp"
+
+namespace entt {
+
+/**
+ * @cond TURN_OFF_DOXYGEN
+ * Internal details not to be documented.
+ */
+
+namespace internal {
+
+enum class any_operation : std::uint8_t {
+    copy,
+    move,
+    transfer,
+    assign,
+    destroy,
+    compare,
+    get
+};
+
+enum class any_policy : std::uint8_t {
+    owner,
+    ref,
+    cref
+};
+
+} // namespace internal
+
+/**
+ * Internal details not to be documented.
+ * @endcond
+ */
+
+/**
+ * @brief A SBO friendly, type-safe container for single values of any type.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Optional alignment requirement.
+ */
+template<std::size_t Len, std::size_t Align>
+class basic_any {
+    using operation = internal::any_operation;
+    using policy = internal::any_policy;
+    using vtable_type = const void *(const operation, const basic_any &, const void *);
+
+    struct storage_type {
+        alignas(Align) std::byte data[Len + !Len];
+    };
+
+    template<typename Type>
+    static constexpr bool in_situ = Len && alignof(Type) <= Align && sizeof(Type) <= Len &&std::is_nothrow_move_constructible_v<Type>;
+
+    template<typename Type>
+    static const void *basic_vtable(const operation op, const basic_any &value, const void *other) {
+        static_assert(!std::is_same_v<Type, void> && std::is_same_v<std::remove_cv_t<std::remove_reference_t<Type>>, Type>, "Invalid type");
+        const Type *element = nullptr;
+
+        if constexpr(in_situ<Type>) {
+            element = value.owner() ? reinterpret_cast<const Type *>(&value.storage) : static_cast<const Type *>(value.instance);
+        } else {
+            element = static_cast<const Type *>(value.instance);
+        }
+
+        switch(op) {
+        case operation::copy:
+            if constexpr(std::is_copy_constructible_v<Type>) {
+                static_cast<basic_any *>(const_cast<void *>(other))->initialize<Type>(*element);
+            }
+            break;
+        case operation::move:
+            if constexpr(in_situ<Type>) {
+                if(value.owner()) {
+                    return new(&static_cast<basic_any *>(const_cast<void *>(other))->storage) Type{std::move(*const_cast<Type *>(element))};
+                }
+            }
+
+            return (static_cast<basic_any *>(const_cast<void *>(other))->instance = std::exchange(const_cast<basic_any &>(value).instance, nullptr));
+        case operation::transfer:
+            if constexpr(std::is_move_assignable_v<Type>) {
+                *const_cast<Type *>(element) = std::move(*static_cast<Type *>(const_cast<void *>(other)));
+                return other;
+            }
+            [[fallthrough]];
+        case operation::assign:
+            if constexpr(std::is_copy_assignable_v<Type>) {
+                *const_cast<Type *>(element) = *static_cast<const Type *>(other);
+                return other;
+            }
+            break;
+        case operation::destroy:
+            if constexpr(in_situ<Type>) {
+                element->~Type();
+            } else if constexpr(std::is_array_v<Type>) {
+                delete[] element;
+            } else {
+                delete element;
+            }
+            break;
+        case operation::compare:
+            if constexpr(!std::is_function_v<Type> && !std::is_array_v<Type> && is_equality_comparable_v<Type>) {
+                return *element == *static_cast<const Type *>(other) ? other : nullptr;
+            } else {
+                return (element == other) ? other : nullptr;
+            }
+        case operation::get:
+            return element;
+        }
+
+        return nullptr;
+    }
+
+    template<typename Type, typename... Args>
+    void initialize([[maybe_unused]] Args &&...args) {
+        info = &type_id<std::remove_cv_t<std::remove_reference_t<Type>>>();
+
+        if constexpr(!std::is_void_v<Type>) {
+            vtable = basic_vtable<std::remove_cv_t<std::remove_reference_t<Type>>>;
+
+            if constexpr(std::is_lvalue_reference_v<Type>) {
+                static_assert(sizeof...(Args) == 1u && (std::is_lvalue_reference_v<Args> && ...), "Invalid arguments");
+                mode = std::is_const_v<std::remove_reference_t<Type>> ? policy::cref : policy::ref;
+                instance = (std::addressof(args), ...);
+            } else if constexpr(in_situ<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+                if constexpr(sizeof...(Args) != 0u && std::is_aggregate_v<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+                    new(&storage) std::remove_cv_t<std::remove_reference_t<Type>>{std::forward<Args>(args)...};
+                } else {
+                    new(&storage) std::remove_cv_t<std::remove_reference_t<Type>>(std::forward<Args>(args)...);
+                }
+            } else {
+                if constexpr(sizeof...(Args) != 0u && std::is_aggregate_v<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+                    instance = new std::remove_cv_t<std::remove_reference_t<Type>>{std::forward<Args>(args)...};
+                } else {
+                    instance = new std::remove_cv_t<std::remove_reference_t<Type>>(std::forward<Args>(args)...);
+                }
+            }
+        }
+    }
+
+    basic_any(const basic_any &other, const policy pol) noexcept
+        : instance{other.data()},
+          info{other.info},
+          vtable{other.vtable},
+          mode{pol} {}
+
+public:
+    /*! @brief Size of the internal storage. */
+    static constexpr auto length = Len;
+    /*! @brief Alignment requirement. */
+    static constexpr auto alignment = Align;
+
+    /*! @brief Default constructor. */
+    constexpr basic_any() noexcept
+        : basic_any{std::in_place_type<void>} {}
+
+    /**
+     * @brief Constructs a wrapper by directly initializing the new object.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @tparam Args Types of arguments to use to construct the new instance.
+     * @param args Parameters to use to construct the instance.
+     */
+    template<typename Type, typename... Args>
+    explicit basic_any(std::in_place_type_t<Type>, Args &&...args)
+        : instance{},
+          info{},
+          vtable{},
+          mode{policy::owner} {
+        initialize<Type>(std::forward<Args>(args)...);
+    }
+
+    /**
+     * @brief Constructs a wrapper from a given value.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @param value An instance of an object to use to initialize the wrapper.
+     */
+    template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, basic_any>>>
+    basic_any(Type &&value)
+        : basic_any{std::in_place_type<std::decay_t<Type>>, std::forward<Type>(value)} {}
+
+    /**
+     * @brief Copy constructor.
+     * @param other The instance to copy from.
+     */
+    basic_any(const basic_any &other)
+        : basic_any{} {
+        if(other.vtable) {
+            other.vtable(operation::copy, other, this);
+        }
+    }
+
+    /**
+     * @brief Move constructor.
+     * @param other The instance to move from.
+     */
+    basic_any(basic_any &&other) noexcept
+        : instance{},
+          info{other.info},
+          vtable{other.vtable},
+          mode{other.mode} {
+        if(other.vtable) {
+            other.vtable(operation::move, other, this);
+        }
+    }
+
+    /*! @brief Frees the internal storage, whatever it means. */
+    ~basic_any() {
+        if(vtable && owner()) {
+            vtable(operation::destroy, *this, nullptr);
+        }
+    }
+
+    /**
+     * @brief Copy assignment operator.
+     * @param other The instance to copy from.
+     * @return This any object.
+     */
+    basic_any &operator=(const basic_any &other) {
+        reset();
+
+        if(other.vtable) {
+            other.vtable(operation::copy, other, this);
+        }
+
+        return *this;
+    }
+
+    /**
+     * @brief Move assignment operator.
+     * @param other The instance to move from.
+     * @return This any object.
+     */
+    basic_any &operator=(basic_any &&other) noexcept {
+        reset();
+
+        if(other.vtable) {
+            other.vtable(operation::move, other, this);
+            info = other.info;
+            vtable = other.vtable;
+            mode = other.mode;
+        }
+
+        return *this;
+    }
+
+    /**
+     * @brief Value assignment operator.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @param value An instance of an object to use to initialize the wrapper.
+     * @return This any object.
+     */
+    template<typename Type>
+    std::enable_if_t<!std::is_same_v<std::decay_t<Type>, basic_any>, basic_any &>
+    operator=(Type &&value) {
+        emplace<std::decay_t<Type>>(std::forward<Type>(value));
+        return *this;
+    }
+
+    /**
+     * @brief Returns the object type if any, `type_id<void>()` otherwise.
+     * @return The object type if any, `type_id<void>()` otherwise.
+     */
+    [[nodiscard]] const type_info &type() const noexcept {
+        return *info;
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] const void *data() const noexcept {
+        return vtable ? vtable(operation::get, *this, nullptr) : nullptr;
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @param req Expected type.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] const void *data(const type_info &req) const noexcept {
+        return *info == req ? data() : nullptr;
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] void *data() noexcept {
+        return mode == policy::cref ? nullptr : const_cast<void *>(std::as_const(*this).data());
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @param req Expected type.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] void *data(const type_info &req) noexcept {
+        return mode == policy::cref ? nullptr : const_cast<void *>(std::as_const(*this).data(req));
+    }
+
+    /**
+     * @brief Replaces the contained object by creating a new instance directly.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @tparam Args Types of arguments to use to construct the new instance.
+     * @param args Parameters to use to construct the instance.
+     */
+    template<typename Type, typename... Args>
+    void emplace(Args &&...args) {
+        reset();
+        initialize<Type>(std::forward<Args>(args)...);
+    }
+
+    /**
+     * @brief Assigns a value to the contained object without replacing it.
+     * @param other The value to assign to the contained object.
+     * @return True in case of success, false otherwise.
+     */
+    bool assign(const basic_any &other) {
+        if(vtable && mode != policy::cref && *info == *other.info) {
+            return (vtable(operation::assign, *this, other.data()) != nullptr);
+        }
+
+        return false;
+    }
+
+    /*! @copydoc assign */
+    bool assign(basic_any &&other) {
+        if(vtable && mode != policy::cref && *info == *other.info) {
+            if(auto *val = other.data(); val) {
+                return (vtable(operation::transfer, *this, val) != nullptr);
+            } else {
+                return (vtable(operation::assign, *this, std::as_const(other).data()) != nullptr);
+            }
+        }
+
+        return false;
+    }
+
+    /*! @brief Destroys contained object */
+    void reset() {
+        if(vtable && owner()) {
+            vtable(operation::destroy, *this, nullptr);
+        }
+
+        // unnecessary but it helps to detect nasty bugs
+        ENTT_ASSERT((instance = nullptr) == nullptr, "");
+        info = &type_id<void>();
+        vtable = nullptr;
+        mode = policy::owner;
+    }
+
+    /**
+     * @brief Returns false if a wrapper is empty, true otherwise.
+     * @return False if the wrapper is empty, true otherwise.
+     */
+    [[nodiscard]] explicit operator bool() const noexcept {
+        return vtable != nullptr;
+    }
+
+    /**
+     * @brief Checks if two wrappers differ in their content.
+     * @param other Wrapper with which to compare.
+     * @return False if the two objects differ in their content, true otherwise.
+     */
+    [[nodiscard]] bool operator==(const basic_any &other) const noexcept {
+        if(vtable && *info == *other.info) {
+            return (vtable(operation::compare, *this, other.data()) != nullptr);
+        }
+
+        return (!vtable && !other.vtable);
+    }
+
+    /**
+     * @brief Checks if two wrappers differ in their content.
+     * @param other Wrapper with which to compare.
+     * @return True if the two objects differ in their content, false otherwise.
+     */
+    [[nodiscard]] bool operator!=(const basic_any &other) const noexcept {
+        return !(*this == other);
+    }
+
+    /**
+     * @brief Aliasing constructor.
+     * @return A wrapper that shares a reference to an unmanaged object.
+     */
+    [[nodiscard]] basic_any as_ref() noexcept {
+        return basic_any{*this, (mode == policy::cref ? policy::cref : policy::ref)};
+    }
+
+    /*! @copydoc as_ref */
+    [[nodiscard]] basic_any as_ref() const noexcept {
+        return basic_any{*this, policy::cref};
+    }
+
+    /**
+     * @brief Returns true if a wrapper owns its object, false otherwise.
+     * @return True if the wrapper owns its object, false otherwise.
+     */
+    [[nodiscard]] bool owner() const noexcept {
+        return (mode == policy::owner);
+    }
+
+private:
+    union {
+        const void *instance;
+        storage_type storage;
+    };
+    const type_info *info;
+    vtable_type *vtable;
+    policy mode;
+};
+
+/**
+ * @brief Performs type-safe access to the contained object.
+ * @tparam Type Type to which conversion is required.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Alignment requirement.
+ * @param data Target any object.
+ * @return The element converted to the requested type.
+ */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type any_cast(const basic_any<Len, Align> &data) noexcept {
+    const auto *const instance = any_cast<std::remove_reference_t<Type>>(&data);
+    ENTT_ASSERT(instance, "Invalid instance");
+    return static_cast<Type>(*instance);
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type any_cast(basic_any<Len, Align> &data) noexcept {
+    // forces const on non-reference types to make them work also with wrappers for const references
+    auto *const instance = any_cast<std::remove_reference_t<const Type>>(&data);
+    ENTT_ASSERT(instance, "Invalid instance");
+    return static_cast<Type>(*instance);
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type any_cast(basic_any<Len, Align> &&data) noexcept {
+    if constexpr(std::is_copy_constructible_v<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+        if(auto *const instance = any_cast<std::remove_reference_t<Type>>(&data); instance) {
+            return static_cast<Type>(std::move(*instance));
+        } else {
+            return any_cast<Type>(data);
+        }
+    } else {
+        auto *const instance = any_cast<std::remove_reference_t<Type>>(&data);
+        ENTT_ASSERT(instance, "Invalid instance");
+        return static_cast<Type>(std::move(*instance));
+    }
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+const Type *any_cast(const basic_any<Len, Align> *data) noexcept {
+    const auto &info = type_id<std::remove_cv_t<Type>>();
+    return static_cast<const Type *>(data->data(info));
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type *any_cast(basic_any<Len, Align> *data) noexcept {
+    if constexpr(std::is_const_v<Type>) {
+        // last attempt to make wrappers for const references return their values
+        return any_cast<Type>(&std::as_const(*data));
+    } else {
+        const auto &info = type_id<std::remove_cv_t<Type>>();
+        return static_cast<Type *>(data->data(info));
+    }
+}
+
+/**
+ * @brief Constructs a wrapper from a given type, passing it all arguments.
+ * @tparam Type Type of object to use to initialize the wrapper.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Optional alignment requirement.
+ * @tparam Args Types of arguments to use to construct the new instance.
+ * @param args Parameters to use to construct the instance.
+ * @return A properly initialized wrapper for an object of the given type.
+ */
+template<typename Type, std::size_t Len = basic_any<>::length, std::size_t Align = basic_any<Len>::alignment, typename... Args>
+basic_any<Len, Align> make_any(Args &&...args) {
+    return basic_any<Len, Align>{std::in_place_type<Type>, std::forward<Args>(args)...};
+}
+
+/**
+ * @brief Forwards its argument and avoids copies for lvalue references.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Optional alignment requirement.
+ * @tparam Type Type of argument to use to construct the new instance.
+ * @param value Parameter to use to construct the instance.
+ * @return A properly initialized and not necessarily owning wrapper.
+ */
+template<std::size_t Len = basic_any<>::length, std::size_t Align = basic_any<Len>::alignment, typename Type>
+basic_any<Len, Align> forward_as_any(Type &&value) {
+    return basic_any<Len, Align>{std::in_place_type<Type &&>, std::forward<Type>(value)};
+}
+
+} // namespace entt
+
+#endif

external/entt/entt/src/entt/core/attribute.h

@@ -0,0 +1,30 @@
+#ifndef ENTT_CORE_ATTRIBUTE_H
+#define ENTT_CORE_ATTRIBUTE_H
+
+#ifndef ENTT_EXPORT
+#    if defined _WIN32 || defined __CYGWIN__ || defined _MSC_VER
+#        define ENTT_EXPORT __declspec(dllexport)
+#        define ENTT_IMPORT __declspec(dllimport)
+#        define ENTT_HIDDEN
+#    elif defined __GNUC__ && __GNUC__ >= 4
+#        define ENTT_EXPORT __attribute__((visibility("default")))
+#        define ENTT_IMPORT __attribute__((visibility("default")))
+#        define ENTT_HIDDEN __attribute__((visibility("hidden")))
+#    else /* Unsupported compiler */
+#        define ENTT_EXPORT
+#        define ENTT_IMPORT
+#        define ENTT_HIDDEN
+#    endif
+#endif
+
+#ifndef ENTT_API
+#    if defined ENTT_API_EXPORT
+#        define ENTT_API ENTT_EXPORT
+#    elif defined ENTT_API_IMPORT
+#        define ENTT_API ENTT_IMPORT
+#    else /* No API */
+#        define ENTT_API
+#    endif
+#endif
+
+#endif

external/entt/entt/src/entt/core/compressed_pair.hpp

@@ -0,0 +1,279 @@
+#ifndef ENTT_CORE_COMPRESSED_PAIR_HPP
+#define ENTT_CORE_COMPRESSED_PAIR_HPP
+
+#include <cstddef>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include "type_traits.hpp"
+
+namespace entt {
+
+/**
+ * @cond TURN_OFF_DOXYGEN
+ * Internal details not to be documented.
+ */
+
+namespace internal {
+
+template<typename Type, std::size_t, typename = void>
+struct compressed_pair_element {
+    using reference = Type &;
+    using const_reference = const Type &;
+
+    template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<Type>>>
+    constexpr compressed_pair_element() noexcept(std::is_nothrow_default_constructible_v<Type>)
+        : value{} {}
+
+    template<typename Arg, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Arg>>, compressed_pair_element>>>
+    constexpr compressed_pair_element(Arg &&arg) noexcept(std::is_nothrow_constructible_v<Type, Arg>)
+        : value{std::forward<Arg>(arg)} {}
+
+    template<typename... Args, std::size_t... Index>
+    constexpr compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>) noexcept(std::is_nothrow_constructible_v<Type, Args...>)
+        : value{std::forward<Args>(std::get<Index>(args))...} {}
+
+    [[nodiscard]] constexpr reference get() noexcept {
+        return value;
+    }
+
+    [[nodiscard]] constexpr const_reference get() const noexcept {
+        return value;
+    }
+
+private:
+    Type value;
+};
+
+template<typename Type, std::size_t Tag>
+struct compressed_pair_element<Type, Tag, std::enable_if_t<is_ebco_eligible_v<Type>>>: Type {
+    using reference = Type &;
+    using const_reference = const Type &;
+    using base_type = Type;
+
+    template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<base_type>>>
+    constexpr compressed_pair_element() noexcept(std::is_nothrow_default_constructible_v<base_type>)
+        : base_type{} {}
+
+    template<typename Arg, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Arg>>, compressed_pair_element>>>
+    constexpr compressed_pair_element(Arg &&arg) noexcept(std::is_nothrow_constructible_v<base_type, Arg>)
+        : base_type{std::forward<Arg>(arg)} {}
+
+    template<typename... Args, std::size_t... Index>
+    constexpr compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>) noexcept(std::is_nothrow_constructible_v<base_type, Args...>)
+        : base_type{std::forward<Args>(std::get<Index>(args))...} {}
+
+    [[nodiscard]] constexpr reference get() noexcept {
+        return *this;
+    }
+
+    [[nodiscard]] constexpr const_reference get() const noexcept {
+        return *this;
+    }
+};
+
+} // namespace internal
+
+/**
+ * Internal details not to be documented.
+ * @endcond
+ */
+
+/**
+ * @brief A compressed pair.
+ *
+ * A pair that exploits the _Empty Base Class Optimization_ (or _EBCO_) to
+ * reduce its final size to a minimum.
+ *
+ * @tparam First The type of the first element that the pair stores.
+ * @tparam Second The type of the second element that the pair stores.
+ */
+template<typename First, typename Second>
+class compressed_pair final
+    : internal::compressed_pair_element<First, 0u>,
+      internal::compressed_pair_element<Second, 1u> {
+    using first_base = internal::compressed_pair_element<First, 0u>;
+    using second_base = internal::compressed_pair_element<Second, 1u>;
+
+public:
+    /*! @brief The type of the first element that the pair stores. */
+    using first_type = First;
+    /*! @brief The type of the second element that the pair stores. */
+    using second_type = Second;
+
+    /**
+     * @brief Default constructor, conditionally enabled.
+     *
+     * This constructor is only available when the types that the pair stores
+     * are both at least default constructible.
+     *
+     * @tparam Dummy Dummy template parameter used for internal purposes.
+     */
+    template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<first_type> && std::is_default_constructible_v<second_type>>>
+    constexpr compressed_pair() noexcept(std::is_nothrow_default_constructible_v<first_base> &&std::is_nothrow_default_constructible_v<second_base>)
+        : first_base{},
+          second_base{} {}
+
+    /**
+     * @brief Copy constructor.
+     * @param other The instance to copy from.
+     */
+    constexpr compressed_pair(const compressed_pair &other) noexcept(std::is_nothrow_copy_constructible_v<first_base> &&std::is_nothrow_copy_constructible_v<second_base>) = default;
+
+    /**
+     * @brief Move constructor.
+     * @param other The instance to move from.
+     */
+    constexpr compressed_pair(compressed_pair &&other) noexcept(std::is_nothrow_move_constructible_v<first_base> &&std::is_nothrow_move_constructible_v<second_base>) = default;
+
+    /**
+     * @brief Constructs a pair from its values.
+     * @tparam Arg Type of value to use to initialize the first element.
+     * @tparam Other Type of value to use to initialize the second element.
+     * @param arg Value to use to initialize the first element.
+     * @param other Value to use to initialize the second element.
+     */
+    template<typename Arg, typename Other>
+    constexpr compressed_pair(Arg &&arg, Other &&other) noexcept(std::is_nothrow_constructible_v<first_base, Arg> &&std::is_nothrow_constructible_v<second_base, Other>)
+        : first_base{std::forward<Arg>(arg)},
+          second_base{std::forward<Other>(other)} {}
+
+    /**
+     * @brief Constructs a pair by forwarding the arguments to its parts.
+     * @tparam Args Types of arguments to use to initialize the first element.
+     * @tparam Other Types of arguments to use to initialize the second element.
+     * @param args Arguments to use to initialize the first element.
+     * @param other Arguments to use to initialize the second element.
+     */
+    template<typename... Args, typename... Other>
+    constexpr compressed_pair(std::piecewise_construct_t, std::tuple<Args...> args, std::tuple<Other...> other) noexcept(std::is_nothrow_constructible_v<first_base, Args...> &&std::is_nothrow_constructible_v<second_base, Other...>)
+        : first_base{std::move(args), std::index_sequence_for<Args...>{}},
+          second_base{std::move(other), std::index_sequence_for<Other...>{}} {}
+
+    /**
+     * @brief Copy assignment operator.
+     * @param other The instance to copy from.
+     * @return This compressed pair object.
+     */
+    constexpr compressed_pair &operator=(const compressed_pair &other) noexcept(std::is_nothrow_copy_assignable_v<first_base> &&std::is_nothrow_copy_assignable_v<second_base>) = default;
+
+    /**
+     * @brief Move assignment operator.
+     * @param other The instance to move from.
+     * @return This compressed pair object.
+     */
+    constexpr compressed_pair &operator=(compressed_pair &&other) noexcept(std::is_nothrow_move_assignable_v<first_base> &&std::is_nothrow_move_assignable_v<second_base>) = default;
+
+    /**
+     * @brief Returns the first element that a pair stores.
+     * @return The first element that a pair stores.
+     */
+    [[nodiscard]] constexpr first_type &first() noexcept {
+        return static_cast<first_base &>(*this).get();
+    }
+
+    /*! @copydoc first */
+    [[nodiscard]] constexpr const first_type &first() const noexcept {
+        return static_cast<const first_base &>(*this).get();
+    }
+
+    /**
+     * @brief Returns the second element that a pair stores.
+     * @return The second element that a pair stores.
+     */
+    [[nodiscard]] constexpr second_type &second() noexcept {
+        return static_cast<second_base &>(*this).get();
+    }
+
+    /*! @copydoc second */
+    [[nodiscard]] constexpr const second_type &second() const noexcept {
+        return static_cast<const second_base &>(*this).get();
+    }
+
+    /**
+     * @brief Swaps two compressed pair objects.
+     * @param other The compressed pair to swap with.
+     */
+    constexpr void swap(compressed_pair &other) noexcept(std::is_nothrow_swappable_v<first_type> &&std::is_nothrow_swappable_v<second_type>) {
+        using std::swap;
+        swap(first(), other.first());
+        swap(second(), other.second());
+    }
+
+    /**
+     * @brief Extracts an element from the compressed pair.
+     * @tparam Index An integer value that is either 0 or 1.
+     * @return Returns a reference to the first element if `Index` is 0 and a
+     * reference to the second element if `Index` is 1.
+     */
+    template<std::size_t Index>
+    constexpr decltype(auto) get() noexcept {
+        if constexpr(Index == 0u) {
+            return first();
+        } else {
+            static_assert(Index == 1u, "Index out of bounds");
+            return second();
+        }
+    }
+
+    /*! @copydoc get */
+    template<std::size_t Index>
+    constexpr decltype(auto) get() const noexcept {
+        if constexpr(Index == 0u) {
+            return first();
+        } else {
+            static_assert(Index == 1u, "Index out of bounds");
+            return second();
+        }
+    }
+};
+
+/**
+ * @brief Deduction guide.
+ * @tparam Type Type of value to use to initialize the first element.
+ * @tparam Other Type of value to use to initialize the second element.
+ */
+template<typename Type, typename Other>
+compressed_pair(Type &&, Other &&) -> compressed_pair<std::decay_t<Type>, std::decay_t<Other>>;
+
+/**
+ * @brief Swaps two compressed pair objects.
+ * @tparam First The type of the first element that the pairs store.
+ * @tparam Second The type of the second element that the pairs store.
+ * @param lhs A valid compressed pair object.
+ * @param rhs A valid compressed pair object.
+ */
+template<typename First, typename Second>
+inline constexpr void swap(compressed_pair<First, Second> &lhs, compressed_pair<First, Second> &rhs) {
+    lhs.swap(rhs);
+}
+
+} // namespace entt
+
+// disable structured binding support for clang 6, it messes when specializing tuple_size
+#if !defined __clang_major__ || __clang_major__ > 6
+namespace std {
+
+/**
+ * @brief `std::tuple_size` specialization for `compressed_pair`s.
+ * @tparam First The type of the first element that the pair stores.
+ * @tparam Second The type of the second element that the pair stores.
+ */
+template<typename First, typename Second>
+struct tuple_size<entt::compressed_pair<First, Second>>: integral_constant<size_t, 2u> {};
+
+/**
+ * @brief `std::tuple_element` specialization for `compressed_pair`s.
+ * @tparam Index The index of the type to return.
+ * @tparam First The type of the first element that the pair stores.
+ * @tparam Second The type of the second element that the pair stores.
+ */
+template<size_t Index, typename First, typename Second>
+struct tuple_element<Index, entt::compressed_pair<First, Second>>: conditional<Index == 0u, First, Second> {
+    static_assert(Index < 2u, "Index out of bounds");
+};
+
+} // namespace std
+#endif
+
+#endif

external/entt/entt/src/entt/core/enum.hpp

@@ -0,0 +1,97 @@
+#ifndef ENTT_CORE_ENUM_HPP
+#define ENTT_CORE_ENUM_HPP
+
+#include <type_traits>
+
+namespace entt {
+
+/**
+ * @brief Enable bitmask support for enum classes.
+ * @tparam Type The enum type for which to enable bitmask support.
+ */
+template<typename Type, typename = void>
+struct enum_as_bitmask: std::false_type {};
+
+/*! @copydoc enum_as_bitmask */
+template<typename Type>
+struct enum_as_bitmask<Type, std::void_t<decltype(Type::_entt_enum_as_bitmask)>>: std::is_enum<Type> {};
+
+/**
+ * @brief Helper variable template.
+ * @tparam Type The enum class type for which to enable bitmask support.
+ */
+template<typename Type>
+inline constexpr bool enum_as_bitmask_v = enum_as_bitmask<Type>::value;
+
+} // namespace entt
+
+/**
+ * @brief Operator available for enums for which bitmask support is enabled.
+ * @tparam Type Enum class type.
+ * @param lhs The first value to use.
+ * @param rhs The second value to use.
+ * @return The result of invoking the operator on the underlying types of the
+ * two values provided.
+ */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator|(const Type lhs, const Type rhs) noexcept {
+    return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) | static_cast<std::underlying_type_t<Type>>(rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator&(const Type lhs, const Type rhs) noexcept {
+    return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) & static_cast<std::underlying_type_t<Type>>(rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator^(const Type lhs, const Type rhs) noexcept {
+    return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) ^ static_cast<std::underlying_type_t<Type>>(rhs));
+}
+
+/**
+ * @brief Operator available for enums for which bitmask support is enabled.
+ * @tparam Type Enum class type.
+ * @param value The value to use.
+ * @return The result of invoking the operator on the underlying types of the
+ * value provided.
+ */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator~(const Type value) noexcept {
+    return static_cast<Type>(~static_cast<std::underlying_type_t<Type>>(value));
+}
+
+/*! @copydoc operator~ */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, bool>
+operator!(const Type value) noexcept {
+    return !static_cast<std::underlying_type_t<Type>>(value);
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
+operator|=(Type &lhs, const Type rhs) noexcept {
+    return (lhs = (lhs | rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
+operator&=(Type &lhs, const Type rhs) noexcept {
+    return (lhs = (lhs & rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
+operator^=(Type &lhs, const Type rhs) noexcept {
+    return (lhs = (lhs ^ rhs));
+}
+
+#endif