1 files changed, 293 insertions, 0 deletions

diff --git a/src/contrib/SDL-3.2.20/test/testrendertarget.c b/src/contrib/SDL-3.2.20/test/testrendertarget.c
new file mode 100644
index 0000000..bad57fd
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/test/testrendertarget.c
@@ -0,0 +1,293 @@
+/*
+  Copyright (C) 1997-2025 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 <SDL3/SDL_test_common.h>
+#include <SDL3/SDL_main.h>
+#include "testutils.h"
+
+#ifdef SDL_PLATFORM_EMSCRIPTEN
+#include <emscripten/emscripten.h>
+#endif
+
+#include <stdlib.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;
+static bool test_composite = false;
+
+/* 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 bool
+DrawComposite(DrawState *s)
+{
+    SDL_Rect viewport;
+    SDL_FRect R;
+    SDL_Texture *target;
+    SDL_Surface *surface;
+
+    static bool blend_tested = false;
+    if (!blend_tested) {
+        SDL_Texture *A, *B;
+
+        A = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 1, 1);
+        SDL_SetTextureBlendMode(A, SDL_BLENDMODE_BLEND);
+
+        B = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 1, 1);
+        SDL_SetTextureBlendMode(B, SDL_BLENDMODE_BLEND);
+
+        SDL_SetRenderTarget(s->renderer, A);
+        SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x80);
+        SDL_RenderFillRect(s->renderer, NULL);
+
+        SDL_SetRenderTarget(s->renderer, B);
+        SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x00);
+        SDL_RenderFillRect(s->renderer, NULL);
+        SDL_RenderTexture(s->renderer, A, NULL, NULL);
+
+        surface = SDL_RenderReadPixels(s->renderer, NULL);
+        if (surface) {
+            Uint8 r, g, b, a;
+            if (SDL_ReadSurfacePixel(surface, 0, 0, &r, &g, &b, &a)) {
+                SDL_Log("Blended pixel: 0x%.2x%.2x%.2x%.2x", r, g, b, a);
+            }
+            SDL_DestroySurface(surface);
+        }
+
+        SDL_DestroyTexture(A);
+        SDL_DestroyTexture(B);
+        blend_tested = true;
+    }
+
+    SDL_GetRenderViewport(s->renderer, &viewport);
+
+    target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);
+    SDL_SetTextureBlendMode(target, SDL_BLENDMODE_BLEND);
+    SDL_SetRenderTarget(s->renderer, target);
+
+    /* Draw the background.
+       This is solid black so when the sprite is copied to it, any per-pixel alpha will be blended through.
+     */
+    SDL_SetRenderDrawColor(s->renderer, 0x00, 0x00, 0x00, 0x00);
+    SDL_RenderFillRect(s->renderer, 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 = (viewport.w - s->sprite_rect.w) / 2;
+    s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
+
+    SDL_RenderTexture(s->renderer, s->sprite, NULL, &s->sprite_rect);
+
+    SDL_SetRenderTarget(s->renderer, NULL);
+    SDL_RenderTexture(s->renderer, s->background, NULL, NULL);
+
+    SDL_SetRenderDrawBlendMode(s->renderer, SDL_BLENDMODE_BLEND);
+    SDL_SetRenderDrawColor(s->renderer, 0xff, 0x00, 0x00, 0x80);
+    R.x = 0.0f;
+    R.y = 0.0f;
+    R.w = 100.0f;
+    R.h = 100.0f;
+    SDL_RenderFillRect(s->renderer, &R);
+    SDL_SetRenderDrawBlendMode(s->renderer, SDL_BLENDMODE_NONE);
+
+    SDL_RenderTexture(s->renderer, target, NULL, NULL);
+    SDL_DestroyTexture(target);
+
+    /* Update the screen! */
+    SDL_RenderPresent(s->renderer);
+    return true;
+}
+
+static bool
+Draw(DrawState *s)
+{
+    SDL_Rect viewport;
+    SDL_Texture *target;
+
+    SDL_GetRenderViewport(s->renderer, &viewport);
+
+    target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);
+    if (!target) {
+        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create render target texture: %s", SDL_GetError());
+        return false;
+    }
+    SDL_SetRenderTarget(s->renderer, target);
+
+    /* 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 = (viewport.w - s->sprite_rect.w) / 2;
+    s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
+
+    SDL_RenderTexture(s->renderer, s->sprite, NULL, &s->sprite_rect);
+
+    SDL_SetRenderTarget(s->renderer, NULL);
+    SDL_RenderTexture(s->renderer, target, NULL, NULL);
+    SDL_DestroyTexture(target);
+
+    /* Update the screen! */
+    SDL_RenderPresent(s->renderer);
+    return true;
+}
+
+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;
+        }
+        if (test_composite) {
+            if (!DrawComposite(&drawstates[i])) {
+                done = 1;
+            }
+        } else {
+            if (!Draw(&drawstates[i])) {
+                done = 1;
+            }
+        }
+    }
+#ifdef SDL_PLATFORM_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) {
+        return 1;
+    }
+
+    for (i = 1; i < argc;) {
+        int consumed;
+
+        consumed = SDLTest_CommonArg(state, i);
+        if (consumed == 0) {
+            consumed = -1;
+            if (SDL_strcasecmp(argv[i], "--composite") == 0) {
+                test_composite = true;
+                consumed = 1;
+            }
+        }
+        if (consumed < 0) {
+            static const char *options[] = { "[--composite]", NULL };
+            SDLTest_CommonLogUsage(state, argv[0], options);
+            quit(1);
+        }
+        i += consumed;
+    }
+    if (!SDLTest_CommonInit(state)) {
+        quit(2);
+    }
+
+    drawstates = SDL_stack_alloc(DrawState, state->num_windows);
+    for (i = 0; i < state->num_windows; ++i) {
+        DrawState *drawstate = &drawstates[i];
+
+        drawstate->window = state->windows[i];
+        drawstate->renderer = state->renderers[i];
+        if (test_composite) {
+            drawstate->sprite = LoadTexture(drawstate->renderer, "icon-alpha.bmp", true, NULL, NULL);
+        } else {
+            drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", true, NULL, NULL);
+        }
+        drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", false, NULL, NULL);
+        if (!drawstate->sprite || !drawstate->background) {
+            quit(2);
+        }
+        SDL_GetTextureSize(drawstate->sprite, &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
+        drawstate->scale_direction = 1;
+    }
+
+    /* Main render loop */
+    frames = 0;
+    then = SDL_GetTicks();
+    done = 0;
+
+#ifdef SDL_PLATFORM_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", fps);
+    }
+
+    SDL_stack_free(drawstates);
+
+    quit(0);
+    return 0;
+}