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

external/sdl/SDL/test/testoffscreen.c

@@ -0,0 +1,178 @@
+/*
+  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.
+*/
+
+/* Simple program: picks the offscreen backend and renders each frame to a bmp */
+
+#include <stdlib.h>
+#include <time.h>
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten/emscripten.h>
+#endif
+
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+#include <SDL3/SDL_test.h>
+#include <SDL3/SDL_opengl.h>
+
+static SDL_Renderer *renderer = NULL;
+static SDL_Window *window = NULL;
+static int done = SDL_FALSE;
+static int frame_number = 0;
+static int width = 640;
+static int height = 480;
+static unsigned int max_frames = 200;
+
+static void draw(void)
+{
+    SDL_FRect rect;
+
+    SDL_SetRenderDrawColor(renderer, 0x10, 0x9A, 0xCE, 0xFF);
+    SDL_RenderClear(renderer);
+
+    /* Grow based on the frame just to show a difference per frame of the region */
+    rect.x = 0.0f;
+    rect.y = 0.0f;
+    rect.w = (float)((frame_number * 2) % width);
+    rect.h = (float)((frame_number * 2) % height);
+    SDL_SetRenderDrawColor(renderer, 0xFF, 0x10, 0x21, 0xFF);
+    SDL_RenderFillRect(renderer, &rect);
+
+    SDL_RenderPresent(renderer);
+}
+
+static void save_surface_to_bmp(void)
+{
+    SDL_Surface* surface;
+    Uint32 pixel_format;
+    char file[128];
+
+    pixel_format = SDL_GetWindowPixelFormat(window);
+
+    surface = SDL_CreateSurface(width, height, pixel_format);
+
+    SDL_RenderReadPixels(renderer, NULL, pixel_format, surface->pixels, surface->pitch);
+
+    (void)SDL_snprintf(file, sizeof(file), "SDL_window%" SDL_PRIs32 "-%8.8d.bmp",
+                       SDL_GetWindowID(window), ++frame_number);
+
+    SDL_SaveBMP(surface, file);
+    SDL_DestroySurface(surface);
+}
+
+static void loop(void)
+{
+    SDL_Event event;
+
+    /* Check for events */
+    while (SDL_PollEvent(&event)) {
+        switch (event.type) {
+        case SDL_EVENT_QUIT:
+            done = SDL_TRUE;
+            break;
+        }
+    }
+
+    draw();
+    save_surface_to_bmp();
+
+#ifdef __EMSCRIPTEN__
+    if (done) {
+        emscripten_cancel_main_loop();
+    }
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+#ifndef __EMSCRIPTEN__
+    Uint64 then, now;
+    Uint32 frames;
+#endif
+    SDLTest_CommonState *state;
+
+    /* Initialize test framework */
+    state = SDLTest_CommonCreateState(argv, 0);
+    if (state == NULL) {
+        return 1;
+    }
+
+    /* Enable standard application logging */
+    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
+
+    /* Parse commandline */
+    if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
+        return 1;
+    }
+
+    /* Force the offscreen renderer, if it cannot be created then fail out */
+    SDL_SetHint("SDL_VIDEO_DRIVER", "offscreen");
+    if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
+        SDL_Log("Couldn't initialize the offscreen video driver: %s\n",
+                SDL_GetError());
+        return SDL_FALSE;
+    }
+
+    /* If OPENGL fails to init it will fallback to using a framebuffer for rendering */
+    window = SDL_CreateWindow("Offscreen Test", width, height, 0);
+
+    if (window == NULL) {
+        SDL_Log("Couldn't create window: %s\n", SDL_GetError());
+        return SDL_FALSE;
+    }
+
+    renderer = SDL_CreateRenderer(window, NULL, 0);
+
+    if (renderer == NULL) {
+        SDL_Log("Couldn't create renderer: %s\n",
+                SDL_GetError());
+        return SDL_FALSE;
+    }
+
+    SDL_RenderClear(renderer);
+
+    srand((unsigned int)time(NULL));
+
+#ifndef __EMSCRIPTEN__
+    /* Main render loop */
+    frames = 0;
+    then = SDL_GetTicks();
+    done = 0;
+#endif
+
+    SDL_Log("Rendering %u frames offscreen\n", max_frames);
+
+#ifdef __EMSCRIPTEN__
+    emscripten_set_main_loop(loop, 0, 1);
+#else
+    while (!done && frames < max_frames) {
+        ++frames;
+        loop();
+
+        /* Print out some timing information, along with remaining frames */
+        if (frames % (max_frames / 10) == 0) {
+            now = SDL_GetTicks();
+            if (now > then) {
+                double fps = ((double)frames * 1000) / (now - then);
+                SDL_Log("Frames remaining: %" SDL_PRIu32 " rendering at %2.2f frames per second\n", max_frames - frames, fps);
+            }
+        }
+    }
+#endif
+
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+    SDLTest_CommonDestroyState(state);
+
+    return 0;
+}