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

external/sdl/SDL/test/testscale.c

@@ -0,0 +1,169 @@
+/*
+  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:  Move N sprites around on the screen as fast as possible */
+
+#include <stdlib.h>
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten/emscripten.h>
+#endif
+
+#include <SDL3/SDL_test_common.h>
+#include <SDL3/SDL_main.h>
+#include "testutils.h"
+
+static SDLTest_CommonState *state;
+
+typedef struct
+{
+    SDL_Window *window;
+    SDL_Renderer *renderer;
+    SDL_Texture *background;
+    SDL_Texture *sprite;
+    SDL_FRect sprite_rect;
+    int scale_direction;
+} DrawState;
+
+static DrawState *drawstates;
+static int done;
+
+/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
+static void
+quit(int rc)
+{
+    SDLTest_CommonQuit(state);
+    /* Let 'main()' return normally */
+    if (rc != 0) {
+        exit(rc);
+    }
+}
+
+static void Draw(DrawState *s)
+{
+    SDL_Rect viewport;
+
+    SDL_GetRenderViewport(s->renderer, &viewport);
+
+    /* Draw the background */
+    SDL_RenderTexture(s->renderer, s->background, NULL, NULL);
+
+    /* Scale and draw the sprite */
+    s->sprite_rect.w += s->scale_direction;
+    s->sprite_rect.h += s->scale_direction;
+    if (s->scale_direction > 0) {
+        if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
+            s->scale_direction = -1;
+        }
+    } else {
+        if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
+            s->scale_direction = 1;
+        }
+    }
+    s->sprite_rect.x = (float)((viewport.w - s->sprite_rect.w) / 2);
+    s->sprite_rect.y = (float)((viewport.h - s->sprite_rect.h) / 2);
+
+    SDL_RenderTexture(s->renderer, s->sprite, NULL, &s->sprite_rect);
+
+    /* Update the screen! */
+    SDL_RenderPresent(s->renderer);
+}
+
+static void loop(void)
+{
+    int i;
+    SDL_Event event;
+
+    /* Check for events */
+    while (SDL_PollEvent(&event)) {
+        SDLTest_CommonEvent(state, &event, &done);
+    }
+    for (i = 0; i < state->num_windows; ++i) {
+        if (state->windows[i] == NULL) {
+            continue;
+        }
+        Draw(&drawstates[i]);
+    }
+#ifdef __EMSCRIPTEN__
+    if (done) {
+        emscripten_cancel_main_loop();
+    }
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+    int i;
+    int frames;
+    Uint64 then, now;
+
+    /* Initialize test framework */
+    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
+    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;
+    }
+
+    if (!SDLTest_CommonInit(state)) {
+        quit(1);
+    }
+
+    drawstates = SDL_stack_alloc(DrawState, state->num_windows);
+    for (i = 0; i < state->num_windows; ++i) {
+        DrawState *drawstate = &drawstates[i];
+        int w, h;
+
+        drawstate->window = state->windows[i];
+        drawstate->renderer = state->renderers[i];
+        drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", SDL_TRUE, NULL, NULL);
+        drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", SDL_FALSE, NULL, NULL);
+        if (!drawstate->sprite || !drawstate->background) {
+            quit(2);
+        }
+        SDL_QueryTexture(drawstate->sprite, NULL, NULL, &w, &h);
+        drawstate->sprite_rect.w = (float)w;
+        drawstate->sprite_rect.h = (float)h;
+        drawstate->scale_direction = 1;
+    }
+
+    /* Main render loop */
+    frames = 0;
+    then = SDL_GetTicks();
+    done = 0;
+
+#ifdef __EMSCRIPTEN__
+    emscripten_set_main_loop(loop, 0, 1);
+#else
+    while (!done) {
+        ++frames;
+        loop();
+    }
+#endif
+
+    /* Print out some timing information */
+    now = SDL_GetTicks();
+    if (now > then) {
+        double fps = ((double)frames * 1000) / (now - then);
+        SDL_Log("%2.2f frames per second\n", fps);
+    }
+
+    SDL_stack_free(drawstates);
+
+    quit(0);
+    return 0;
+}