Merge commit 'dec0d4ec4153bf9fc2b78ae6c2df45b6ea8dde7a' as 'external/sdl/SDL'

external/sdl/SDL/src/timer/SDL_timer.c

@@ -0,0 +1,601 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include "SDL_timer_c.h"
+#include "../thread/SDL_systhread.h"
+
+/* #define DEBUG_TIMERS */
+
+#if !defined(__EMSCRIPTEN__) || !defined(SDL_THREADS_DISABLED)
+
+typedef struct SDL_Timer
+{
+    int timerID;
+    SDL_TimerCallback callback;
+    void *param;
+    Uint64 interval;
+    Uint64 scheduled;
+    SDL_AtomicInt canceled;
+    struct SDL_Timer *next;
+} SDL_Timer;
+
+typedef struct SDL_TimerMap
+{
+    int timerID;
+    SDL_Timer *timer;
+    struct SDL_TimerMap *next;
+} SDL_TimerMap;
+
+/* The timers are kept in a sorted list */
+typedef struct
+{
+    /* Data used by the main thread */
+    SDL_Thread *thread;
+    SDL_AtomicInt nextID;
+    SDL_TimerMap *timermap;
+    SDL_Mutex *timermap_lock;
+
+    /* Padding to separate cache lines between threads */
+    char cache_pad[SDL_CACHELINE_SIZE];
+
+    /* Data used to communicate with the timer thread */
+    SDL_SpinLock lock;
+    SDL_Semaphore *sem;
+    SDL_Timer *pending;
+    SDL_Timer *freelist;
+    SDL_AtomicInt active;
+
+    /* List of timers - this is only touched by the timer thread */
+    SDL_Timer *timers;
+} SDL_TimerData;
+
+static SDL_TimerData SDL_timer_data;
+
+/* The idea here is that any thread might add a timer, but a single
+ * thread manages the active timer queue, sorted by scheduling time.
+ *
+ * Timers are removed by simply setting a canceled flag
+ */
+
+static void SDL_AddTimerInternal(SDL_TimerData *data, SDL_Timer *timer)
+{
+    SDL_Timer *prev, *curr;
+
+    prev = NULL;
+    for (curr = data->timers; curr; prev = curr, curr = curr->next) {
+        if (curr->scheduled > timer->scheduled) {
+            break;
+        }
+    }
+
+    /* Insert the timer here! */
+    if (prev) {
+        prev->next = timer;
+    } else {
+        data->timers = timer;
+    }
+    timer->next = curr;
+}
+
+static int SDLCALL SDL_TimerThread(void *_data)
+{
+    SDL_TimerData *data = (SDL_TimerData *)_data;
+    SDL_Timer *pending;
+    SDL_Timer *current;
+    SDL_Timer *freelist_head = NULL;
+    SDL_Timer *freelist_tail = NULL;
+    Uint64 tick, now, interval, delay;
+
+    /* Threaded timer loop:
+     *  1. Queue timers added by other threads
+     *  2. Handle any timers that should dispatch this cycle
+     *  3. Wait until next dispatch time or new timer arrives
+     */
+    for (;;) {
+        /* Pending and freelist maintenance */
+        SDL_AtomicLock(&data->lock);
+        {
+            /* Get any timers ready to be queued */
+            pending = data->pending;
+            data->pending = NULL;
+
+            /* Make any unused timer structures available */
+            if (freelist_head) {
+                freelist_tail->next = data->freelist;
+                data->freelist = freelist_head;
+            }
+        }
+        SDL_AtomicUnlock(&data->lock);
+
+        /* Sort the pending timers into our list */
+        while (pending) {
+            current = pending;
+            pending = pending->next;
+            SDL_AddTimerInternal(data, current);
+        }
+        freelist_head = NULL;
+        freelist_tail = NULL;
+
+        /* Check to see if we're still running, after maintenance */
+        if (!SDL_AtomicGet(&data->active)) {
+            break;
+        }
+
+        /* Initial delay if there are no timers */
+        delay = (Uint64)SDL_MUTEX_MAXWAIT;
+
+        tick = SDL_GetTicksNS();
+
+        /* Process all the pending timers for this tick */
+        while (data->timers) {
+            current = data->timers;
+
+            if (tick < current->scheduled) {
+                /* Scheduled for the future, wait a bit */
+                delay = (current->scheduled - tick);
+                break;
+            }
+
+            /* We're going to do something with this timer */
+            data->timers = current->next;
+
+            if (SDL_AtomicGet(&current->canceled)) {
+                interval = 0;
+            } else {
+                /* FIXME: We could potentially support sub-millisecond timers now */
+                interval = SDL_MS_TO_NS(current->callback((Uint32)SDL_NS_TO_MS(current->interval), current->param));
+            }
+
+            if (interval > 0) {
+                /* Reschedule this timer */
+                current->interval = interval;
+                current->scheduled = tick + interval;
+                SDL_AddTimerInternal(data, current);
+            } else {
+                if (freelist_head == NULL) {
+                    freelist_head = current;
+                }
+                if (freelist_tail) {
+                    freelist_tail->next = current;
+                }
+                freelist_tail = current;
+
+                SDL_AtomicSet(&current->canceled, 1);
+            }
+        }
+
+        /* Adjust the delay based on processing time */
+        now = SDL_GetTicksNS();
+        interval = (now - tick);
+        if (interval > delay) {
+            delay = 0;
+        } else {
+            delay -= interval;
+        }
+
+        /* Note that each time a timer is added, this will return
+           immediately, but we process the timers added all at once.
+           That's okay, it just means we run through the loop a few
+           extra times.
+         */
+        SDL_WaitSemaphoreTimeoutNS(data->sem, delay);
+    }
+    return 0;
+}
+
+int SDL_InitTimers(void)
+{
+    SDL_TimerData *data = &SDL_timer_data;
+
+    if (!SDL_AtomicGet(&data->active)) {
+        const char *name = "SDLTimer";
+        data->timermap_lock = SDL_CreateMutex();
+        if (!data->timermap_lock) {
+            return -1;
+        }
+
+        data->sem = SDL_CreateSemaphore(0);
+        if (!data->sem) {
+            SDL_DestroyMutex(data->timermap_lock);
+            return -1;
+        }
+
+        SDL_AtomicSet(&data->active, 1);
+
+        /* Timer threads use a callback into the app, so we can't set a limited stack size here. */
+        data->thread = SDL_CreateThreadInternal(SDL_TimerThread, name, 0, data);
+        if (!data->thread) {
+            SDL_QuitTimers();
+            return -1;
+        }
+
+        SDL_AtomicSet(&data->nextID, 1);
+    }
+    return 0;
+}
+
+void SDL_QuitTimers(void)
+{
+    SDL_TimerData *data = &SDL_timer_data;
+    SDL_Timer *timer;
+    SDL_TimerMap *entry;
+
+    if (SDL_AtomicCAS(&data->active, 1, 0)) { /* active? Move to inactive. */
+        /* Shutdown the timer thread */
+        if (data->thread) {
+            SDL_PostSemaphore(data->sem);
+            SDL_WaitThread(data->thread, NULL);
+            data->thread = NULL;
+        }
+
+        SDL_DestroySemaphore(data->sem);
+        data->sem = NULL;
+
+        /* Clean up the timer entries */
+        while (data->timers) {
+            timer = data->timers;
+            data->timers = timer->next;
+            SDL_free(timer);
+        }
+        while (data->freelist) {
+            timer = data->freelist;
+            data->freelist = timer->next;
+            SDL_free(timer);
+        }
+        while (data->timermap) {
+            entry = data->timermap;
+            data->timermap = entry->next;
+            SDL_free(entry);
+        }
+
+        SDL_DestroyMutex(data->timermap_lock);
+        data->timermap_lock = NULL;
+    }
+}
+
+SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_TimerCallback callback, void *param)
+{
+    SDL_TimerData *data = &SDL_timer_data;
+    SDL_Timer *timer;
+    SDL_TimerMap *entry;
+
+    SDL_AtomicLock(&data->lock);
+    if (!SDL_AtomicGet(&data->active)) {
+        if (SDL_InitTimers() < 0) {
+            SDL_AtomicUnlock(&data->lock);
+            return 0;
+        }
+    }
+
+    timer = data->freelist;
+    if (timer) {
+        data->freelist = timer->next;
+    }
+    SDL_AtomicUnlock(&data->lock);
+
+    if (timer) {
+        SDL_RemoveTimer(timer->timerID);
+    } else {
+        timer = (SDL_Timer *)SDL_malloc(sizeof(*timer));
+        if (timer == NULL) {
+            SDL_OutOfMemory();
+            return 0;
+        }
+    }
+    timer->timerID = SDL_AtomicIncRef(&data->nextID);
+    timer->callback = callback;
+    timer->param = param;
+    timer->interval = SDL_MS_TO_NS(interval);
+    timer->scheduled = SDL_GetTicksNS() + timer->interval;
+    SDL_AtomicSet(&timer->canceled, 0);
+
+    entry = (SDL_TimerMap *)SDL_malloc(sizeof(*entry));
+    if (entry == NULL) {
+        SDL_free(timer);
+        SDL_OutOfMemory();
+        return 0;
+    }
+    entry->timer = timer;
+    entry->timerID = timer->timerID;
+
+    SDL_LockMutex(data->timermap_lock);
+    entry->next = data->timermap;
+    data->timermap = entry;
+    SDL_UnlockMutex(data->timermap_lock);
+
+    /* Add the timer to the pending list for the timer thread */
+    SDL_AtomicLock(&data->lock);
+    timer->next = data->pending;
+    data->pending = timer;
+    SDL_AtomicUnlock(&data->lock);
+
+    /* Wake up the timer thread if necessary */
+    SDL_PostSemaphore(data->sem);
+
+    return entry->timerID;
+}
+
+SDL_bool SDL_RemoveTimer(SDL_TimerID id)
+{
+    SDL_TimerData *data = &SDL_timer_data;
+    SDL_TimerMap *prev, *entry;
+    SDL_bool canceled = SDL_FALSE;
+
+    /* Find the timer */
+    SDL_LockMutex(data->timermap_lock);
+    prev = NULL;
+    for (entry = data->timermap; entry; prev = entry, entry = entry->next) {
+        if (entry->timerID == id) {
+            if (prev) {
+                prev->next = entry->next;
+            } else {
+                data->timermap = entry->next;
+            }
+            break;
+        }
+    }
+    SDL_UnlockMutex(data->timermap_lock);
+
+    if (entry) {
+        if (!SDL_AtomicGet(&entry->timer->canceled)) {
+            SDL_AtomicSet(&entry->timer->canceled, 1);
+            canceled = SDL_TRUE;
+        }
+        SDL_free(entry);
+    }
+    return canceled;
+}
+
+#else
+
+#include <emscripten/emscripten.h>
+#include <emscripten/eventloop.h>
+
+typedef struct SDL_TimerMap
+{
+    int timerID;
+    int timeoutID;
+    Uint32 interval;
+    SDL_TimerCallback callback;
+    void *param;
+    struct SDL_TimerMap *next;
+} SDL_TimerMap;
+
+typedef struct
+{
+    int nextID;
+    SDL_TimerMap *timermap;
+} SDL_TimerData;
+
+static SDL_TimerData SDL_timer_data;
+
+static void SDL_Emscripten_TimerHelper(void *userdata)
+{
+    SDL_TimerMap *entry = (SDL_TimerMap *)userdata;
+    entry->interval = entry->callback(entry->interval, entry->param);
+    if (entry->interval > 0) {
+        entry->timeoutID = emscripten_set_timeout(&SDL_Emscripten_TimerHelper,
+                                                  entry->interval,
+                                                  entry);
+    }
+}
+
+int SDL_InitTimers(void)
+{
+    return 0;
+}
+
+void SDL_QuitTimers(void)
+{
+    SDL_TimerData *data = &SDL_timer_data;
+    SDL_TimerMap *entry;
+
+    while (data->timermap) {
+        entry = data->timermap;
+        data->timermap = entry->next;
+        SDL_free(entry);
+    }
+}
+
+SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_TimerCallback callback, void *param)
+{
+    SDL_TimerData *data = &SDL_timer_data;
+    SDL_TimerMap *entry;
+
+    entry = (SDL_TimerMap *)SDL_malloc(sizeof(*entry));
+    if (entry == NULL) {
+        SDL_OutOfMemory();
+        return 0;
+    }
+    entry->timerID = ++data->nextID;
+    entry->callback = callback;
+    entry->param = param;
+    entry->interval = interval;
+
+    entry->timeoutID = emscripten_set_timeout(&SDL_Emscripten_TimerHelper,
+                                              entry->interval,
+                                              entry);
+
+    entry->next = data->timermap;
+    data->timermap = entry;
+
+    return entry->timerID;
+}
+
+SDL_bool SDL_RemoveTimer(SDL_TimerID id)
+{
+    SDL_TimerData *data = &SDL_timer_data;
+    SDL_TimerMap *prev, *entry;
+
+    /* Find the timer */
+    prev = NULL;
+    for (entry = data->timermap; entry; prev = entry, entry = entry->next) {
+        if (entry->timerID == id) {
+            if (prev) {
+                prev->next = entry->next;
+            } else {
+                data->timermap = entry->next;
+            }
+            break;
+        }
+    }
+
+    if (entry) {
+        emscripten_clear_timeout(entry->timeoutID);
+        SDL_free(entry);
+
+        return SDL_TRUE;
+    }
+    return SDL_FALSE;
+}
+
+#endif /* !defined(__EMSCRIPTEN__) || !SDL_THREADS_DISABLED */
+
+static Uint64 tick_start;
+static Uint32 tick_numerator_ns;
+static Uint32 tick_denominator_ns;
+static Uint32 tick_numerator_ms;
+static Uint32 tick_denominator_ms;
+
+#if defined(SDL_TIMER_WINDOWS) && \
+    !defined(__WINRT__) && !defined(__XBOXONE__) && !defined(__XBOXSERIES__)
+#include <mmsystem.h>
+#define HAVE_TIME_BEGIN_PERIOD
+#endif
+
+static void SDL_SetSystemTimerResolutionMS(int period)
+{
+#ifdef HAVE_TIME_BEGIN_PERIOD
+    static int timer_period = 0;
+
+    if (period != timer_period) {
+        if (timer_period) {
+            timeEndPeriod((UINT)timer_period);
+        }
+
+        timer_period = period;
+
+        if (timer_period) {
+            timeBeginPeriod((UINT)timer_period);
+        }
+    }
+#endif /* HAVE_TIME_BEGIN_PERIOD */
+}
+
+static void SDLCALL SDL_TimerResolutionChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
+{
+    int period;
+
+    /* Unless the hint says otherwise, let's have good sleep precision */
+    if (hint && *hint) {
+        period = SDL_atoi(hint);
+    } else {
+        period = 1;
+    }
+    if (period || oldValue != hint) {
+        SDL_SetSystemTimerResolutionMS(period);
+    }
+}
+
+static Uint32 CalculateGCD(Uint32 a, Uint32 b)
+{
+    if (b == 0) {
+        return a;
+    }
+    return CalculateGCD(b, (a % b));
+}
+
+void SDL_InitTicks(void)
+{
+    Uint64 tick_freq;
+    Uint32 gcd;
+
+    if (tick_start) {
+        return;
+    }
+
+    /* If we didn't set a precision, set it high. This affects lots of things
+       on Windows besides the SDL timers, like audio callbacks, etc. */
+    SDL_AddHintCallback(SDL_HINT_TIMER_RESOLUTION,
+                        SDL_TimerResolutionChanged, NULL);
+
+    tick_freq = SDL_GetPerformanceFrequency();
+    SDL_assert(tick_freq > 0 && tick_freq <= (Uint64)SDL_MAX_UINT32);
+
+    gcd = CalculateGCD(SDL_NS_PER_SECOND, (Uint32)tick_freq);
+    tick_numerator_ns = (SDL_NS_PER_SECOND / gcd);
+    tick_denominator_ns = (Uint32)(tick_freq / gcd);
+
+    gcd = CalculateGCD(SDL_MS_PER_SECOND, (Uint32)tick_freq);
+    tick_numerator_ms = (SDL_MS_PER_SECOND / gcd);
+    tick_denominator_ms = (Uint32)(tick_freq / gcd);
+
+    tick_start = SDL_GetPerformanceCounter();
+    if (!tick_start) {
+        --tick_start;
+    }
+}
+
+void SDL_QuitTicks(void)
+{
+    SDL_DelHintCallback(SDL_HINT_TIMER_RESOLUTION,
+                        SDL_TimerResolutionChanged, NULL);
+
+    SDL_SetSystemTimerResolutionMS(0); /* always release our timer resolution request. */
+
+    tick_start = 0;
+}
+
+Uint64 SDL_GetTicksNS(void)
+{
+    Uint64 starting_value, value;
+
+    if (!tick_start) {
+        SDL_InitTicks();
+    }
+
+    starting_value = (SDL_GetPerformanceCounter() - tick_start);
+    value = (starting_value * tick_numerator_ns);
+    SDL_assert(value >= starting_value);
+    value /= tick_denominator_ns;
+    return value;
+}
+
+Uint64 SDL_GetTicks(void)
+{
+    Uint64 starting_value, value;
+
+    if (!tick_start) {
+        SDL_InitTicks();
+    }
+
+    starting_value = (SDL_GetPerformanceCounter() - tick_start);
+    value = (starting_value * tick_numerator_ms);
+    SDL_assert(value >= starting_value);
+    value /= tick_denominator_ms;
+    return value;
+}
+
+void SDL_Delay(Uint32 ms)
+{
+    SDL_DelayNS(SDL_MS_TO_NS(ms));
+}

external/sdl/SDL/src/timer/SDL_timer_c.h

@@ -0,0 +1,37 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_timer_c_h_
+#define SDL_timer_c_h_
+
+#include "SDL_internal.h"
+
+/* Useful functions and variables from SDL_timer.c */
+
+#define ROUND_RESOLUTION(X) \
+    (((X + TIMER_RESOLUTION - 1) / TIMER_RESOLUTION) * TIMER_RESOLUTION)
+
+extern void SDL_InitTicks(void);
+extern void SDL_QuitTicks(void);
+extern int SDL_InitTimers(void);
+extern void SDL_QuitTimers(void);
+
+#endif /* SDL_timer_c_h_ */

external/sdl/SDL/src/timer/dummy/SDL_systimer.c

@@ -0,0 +1,41 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#if defined(SDL_TIMER_DUMMY) || defined(SDL_TIMERS_DISABLED)
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    SDL_Unsupported();
+    return 0;
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    return 1;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    SDL_Unsupported();
+}
+
+#endif /* SDL_TIMER_DUMMY || SDL_TIMERS_DISABLED */

external/sdl/SDL/src/timer/haiku/SDL_systimer.c

@@ -0,0 +1,43 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_HAIKU
+
+#include <kernel/OS.h>
+
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    return system_time();
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    return SDL_US_PER_SECOND;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    snooze((bigtime_t)SDL_NS_TO_US(ns));
+}
+
+#endif /* SDL_TIMER_HAIKU */

external/sdl/SDL/src/timer/n3ds/SDL_systimer.c

@@ -0,0 +1,43 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_N3DS
+
+#include <3ds.h>
+
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    return svcGetSystemTick();
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    return SYSCLOCK_ARM11;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    svcSleepThread(ns);
+}
+
+#endif /* SDL_TIMER_N3DS */

external/sdl/SDL/src/timer/ngage/SDL_systimer.cpp

@@ -0,0 +1,59 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_NGAGE
+
+#include <e32std.h>
+#include <e32hal.h>
+
+static TUint start_tick = 0;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    /* FIXME: Need to account for 32-bit wrapping */
+    return (Uint64)User::TickCount();
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    return SDL_US_PER_SECOND;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    const Uint64 max_delay = 0x7fffffffLL * SDL_NS_PER_US;
+    if (ns > max_delay) {
+        ns = max_delay;
+    }
+    User::After(TTimeIntervalMicroSeconds32((TInt)SDL_NS_TO_US(ns)));
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SDL_TIMER_NGAGE */

external/sdl/SDL/src/timer/ps2/SDL_systimer.c

@@ -0,0 +1,50 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_PS2
+
+#include "../SDL_timer_c.h"
+#include <stdlib.h>
+#include <time.h>
+#include <timer.h>
+#include <sys/time.h>
+
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    return GetTimerSystemTime();
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    return kBUSCLK;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    struct timespec tv;
+    tv.tv_sec = (ns / SDL_NS_PER_SECOND);
+    tv.tv_nsec = (ns % SDL_NS_PER_SECOND);
+    nanosleep(&tv, NULL);
+}
+
+#endif /* SDL_TIMER_PS2 */

external/sdl/SDL/src/timer/psp/SDL_systimer.c

@@ -0,0 +1,58 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_PSP
+
+#include "../SDL_timer_c.h"
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+#include <pspthreadman.h>
+
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    Uint64 ticks;
+	struct timeval now;
+
+	gettimeofday(&now, NULL);
+	ticks = now.tv_sec;
+	ticks *= SDL_US_PER_SECOND;
+	ticks += now.tv_usec;
+    return ticks;
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    return SDL_US_PER_SECOND;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    const Uint64 max_delay = 0xffffffffLL * SDL_NS_PER_US;
+    if (ns > max_delay) {
+        ns = max_delay;
+    }
+    sceKernelDelayThreadCB((SceUInt)SDL_NS_TO_US(ns));
+}
+
+#endif /* SDL_TIMER_PSP */

external/sdl/SDL/src/timer/unix/SDL_systimer.c

@@ -0,0 +1,188 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_UNIX
+
+#include <stdio.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "../SDL_timer_c.h"
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#endif
+
+/* The clock_gettime provides monotonous time, so we should use it if
+   it's available. The clock_gettime function is behind ifdef
+   for __USE_POSIX199309
+   Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005
+*/
+/* Reworked monotonic clock to not assume the current system has one
+   as not all linux kernels provide a monotonic clock (yeah recent ones
+   probably do)
+   Also added macOS Monotonic clock support
+   Based on work in https://github.com/ThomasHabets/monotonic_clock
+ */
+#if defined(HAVE_NANOSLEEP) || defined(HAVE_CLOCK_GETTIME)
+#include <time.h>
+#endif
+#ifdef __APPLE__
+#include <mach/mach_time.h>
+#endif
+
+/* Use CLOCK_MONOTONIC_RAW, if available, which is not subject to adjustment by NTP */
+#ifdef HAVE_CLOCK_GETTIME
+#ifdef CLOCK_MONOTONIC_RAW
+#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC_RAW
+#else
+#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC
+#endif
+#endif
+
+/* The first ticks value of the application */
+#if !defined(HAVE_CLOCK_GETTIME) && defined(__APPLE__)
+mach_timebase_info_data_t mach_base_info;
+#endif
+static SDL_bool checked_monotonic_time = SDL_FALSE;
+static SDL_bool has_monotonic_time = SDL_FALSE;
+
+static void CheckMonotonicTime(void)
+{
+#ifdef HAVE_CLOCK_GETTIME
+    struct timespec value;
+    if (clock_gettime(SDL_MONOTONIC_CLOCK, &value) == 0) {
+        has_monotonic_time = SDL_TRUE;
+    } else
+#elif defined(__APPLE__)
+    if (mach_timebase_info(&mach_base_info) == 0) {
+        has_monotonic_time = SDL_TRUE;
+    }
+#endif
+    checked_monotonic_time = SDL_TRUE;
+}
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    Uint64 ticks;
+
+    if (!checked_monotonic_time) {
+        CheckMonotonicTime();
+    }
+
+    if (has_monotonic_time) {
+#ifdef HAVE_CLOCK_GETTIME
+        struct timespec now;
+
+        clock_gettime(SDL_MONOTONIC_CLOCK, &now);
+        ticks = now.tv_sec;
+        ticks *= SDL_NS_PER_SECOND;
+        ticks += now.tv_nsec;
+#elif defined(__APPLE__)
+        ticks = mach_absolute_time();
+#else
+        SDL_assert(SDL_FALSE);
+        ticks = 0;
+#endif
+    } else {
+        struct timeval now;
+
+        gettimeofday(&now, NULL);
+        ticks = now.tv_sec;
+        ticks *= SDL_US_PER_SECOND;
+        ticks += now.tv_usec;
+    }
+    return ticks;
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    if (!checked_monotonic_time) {
+        CheckMonotonicTime();
+    }
+
+    if (has_monotonic_time) {
+#ifdef HAVE_CLOCK_GETTIME
+        return SDL_NS_PER_SECOND;
+#elif defined(__APPLE__)
+        Uint64 freq = mach_base_info.denom;
+        freq *= SDL_NS_PER_SECOND;
+        freq /= mach_base_info.numer;
+        return freq;
+#endif
+    }
+
+    return SDL_US_PER_SECOND;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    int was_error;
+
+#ifdef HAVE_NANOSLEEP
+    struct timespec tv, remaining;
+#else
+    struct timeval tv;
+    Uint64 then, now, elapsed;
+#endif
+
+#ifdef __EMSCRIPTEN__
+    if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
+        /* pseudo-synchronous pause, used directly or through e.g. SDL_WaitEvent */
+        emscripten_sleep(ns / SDL_NS_PER_MS);
+        return;
+    }
+#endif
+
+    /* Set the timeout interval */
+#ifdef HAVE_NANOSLEEP
+    remaining.tv_sec = (time_t)(ns / SDL_NS_PER_SECOND);
+    remaining.tv_nsec = (long)(ns % SDL_NS_PER_SECOND);
+#else
+    then = SDL_GetTicksNS();
+#endif
+    do {
+        errno = 0;
+
+#ifdef HAVE_NANOSLEEP
+        tv.tv_sec = remaining.tv_sec;
+        tv.tv_nsec = remaining.tv_nsec;
+        was_error = nanosleep(&tv, &remaining);
+#else
+        /* Calculate the time interval left (in case of interrupt) */
+        now = SDL_GetTicksNS();
+        elapsed = (now - then);
+        then = now;
+        if (elapsed >= ns) {
+            break;
+        }
+        ns -= elapsed;
+        tv.tv_sec = (ns / SDL_NS_PER_SECOND);
+        tv.tv_usec = SDL_NS_TO_US(ns % SDL_NS_PER_SECOND);
+
+        was_error = select(0, NULL, NULL, NULL, &tv);
+#endif /* HAVE_NANOSLEEP */
+    } while (was_error && (errno == EINTR));
+}
+
+#endif /* SDL_TIMER_UNIX */

external/sdl/SDL/src/timer/vita/SDL_systimer.c

@@ -0,0 +1,51 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_VITA
+
+#include "../SDL_timer_c.h"
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+#include <psp2/kernel/processmgr.h>
+
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    return sceKernelGetProcessTimeWide();
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    return SDL_US_PER_SECOND;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    const Uint64 max_delay = 0xffffffffLL * SDL_NS_PER_US;
+    if (ns > max_delay) {
+        ns = max_delay;
+    }
+    sceKernelDelayThreadCB((SceUInt)SDL_NS_TO_US(ns));
+}
+
+#endif /* SDL_TIMER_VITA */

external/sdl/SDL/src/timer/windows/SDL_systimer.c

@@ -0,0 +1,115 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_TIMER_WINDOWS
+
+#include "../../core/windows/SDL_windows.h"
+
+
+#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
+static void SDL_CleanupWaitableTimer(void *timer)
+{
+    CloseHandle(timer);
+}
+
+HANDLE SDL_GetWaitableTimer()
+{
+    static SDL_TLSID TLS_timer_handle;
+    HANDLE timer;
+
+    if (!TLS_timer_handle) {
+        TLS_timer_handle = SDL_CreateTLS();
+    }
+    timer = SDL_GetTLS(TLS_timer_handle);
+    if (!timer) {
+        timer = CreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
+        if (timer) {
+            SDL_SetTLS(TLS_timer_handle, timer, SDL_CleanupWaitableTimer);
+        }
+    }
+    return timer;
+}
+#endif /* CREATE_WAITABLE_TIMER_HIGH_RESOLUTION */
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    LARGE_INTEGER counter;
+    const BOOL rc = QueryPerformanceCounter(&counter);
+    SDL_assert(rc != 0); /* this should _never_ fail if you're on XP or later. */
+    return (Uint64)counter.QuadPart;
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    LARGE_INTEGER frequency;
+    const BOOL rc = QueryPerformanceFrequency(&frequency);
+    SDL_assert(rc != 0); /* this should _never_ fail if you're on XP or later. */
+    return (Uint64)frequency.QuadPart;
+}
+
+void SDL_DelayNS(Uint64 ns)
+{
+    /* CREATE_WAITABLE_TIMER_HIGH_RESOLUTION flag was added in Windows 10 version 1803.
+     *
+     * Sleep() is not publicly available to apps in early versions of WinRT.
+     *
+     * Visual C++ 2013 Update 4 re-introduced Sleep() for Windows 8.1 and
+     * Windows Phone 8.1.
+     *
+     * Use the compiler version to determine availability.
+     *
+     * NOTE #1: _MSC_FULL_VER == 180030723 for Visual C++ 2013 Update 3.
+     * NOTE #2: Visual C++ 2013, when compiling for Windows 8.0 and
+     *    Windows Phone 8.0, uses the Visual C++ 2012 compiler to build
+     *    apps and libraries.
+     */
+#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
+    HANDLE timer = SDL_GetWaitableTimer();
+    if (timer) {
+        LARGE_INTEGER due_time;
+        due_time.QuadPart = -((LONGLONG)ns / 100);
+        if (SetWaitableTimerEx(timer, &due_time, 0, NULL, NULL, NULL, 0)) {
+            WaitForSingleObject(timer, INFINITE);
+        }
+        return;
+    }
+#endif
+
+    {
+        const Uint64 max_delay = 0xffffffffLL * SDL_NS_PER_MS;
+        if (ns > max_delay) {
+            ns = max_delay;
+        }
+
+#if defined(__WINRT__) && defined(_MSC_FULL_VER) && (_MSC_FULL_VER <= 180030723)
+        static HANDLE mutex = 0;
+        if (!mutex) {
+            mutex = CreateEventEx(0, 0, 0, EVENT_ALL_ACCESS);
+        }
+        WaitForSingleObjectEx(mutex, (DWORD)SDL_NS_TO_MS(ns), FALSE);
+#else
+        Sleep((DWORD)SDL_NS_TO_MS(ns));
+#endif
+    }
+}
+
+#endif /* SDL_TIMER_WINDOWS */