From 6aaedb813fa11ba0679c3051bc2eb28646b9506c Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 30 Aug 2025 16:53:58 -0700
Subject: Update to SDL3

---
 src/contrib/SDL-3.2.20/test/testoffscreen.c | 167 ++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 src/contrib/SDL-3.2.20/test/testoffscreen.c

(limited to 'src/contrib/SDL-3.2.20/test/testoffscreen.c')

diff --git a/src/contrib/SDL-3.2.20/test/testoffscreen.c b/src/contrib/SDL-3.2.20/test/testoffscreen.c
new file mode 100644
index 0000000..8100bee
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/test/testoffscreen.c
@@ -0,0 +1,167 @@
+/*
+  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: picks the offscreen backend and renders each frame to a bmp */
+
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+#include <SDL3/SDL_test.h>
+#include <SDL3/SDL_opengl.h>
+
+#ifdef SDL_PLATFORM_EMSCRIPTEN
+#include <emscripten/emscripten.h>
+#endif
+
+static SDL_Renderer *renderer = NULL;
+static SDL_Window *window = NULL;
+static int done = 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;
+    char file[128];
+
+    surface = SDL_RenderReadPixels(renderer, NULL);
+
+    (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 = true;
+            break;
+        default:
+            break;
+        }
+    }
+
+    draw();
+    save_surface_to_bmp();
+
+#ifdef SDL_PLATFORM_EMSCRIPTEN
+    if (done) {
+        emscripten_cancel_main_loop();
+    }
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+#ifndef SDL_PLATFORM_EMSCRIPTEN
+    Uint64 then, now;
+    Uint32 frames;
+#endif
+    SDLTest_CommonState *state;
+
+    /* Initialize test framework */
+    state = SDLTest_CommonCreateState(argv, 0);
+    if (!state) {
+        return 1;
+    }
+
+    /* 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_HINT_VIDEO_DRIVER, "offscreen");
+    if (!SDL_InitSubSystem(SDL_INIT_VIDEO)) {
+        SDL_Log("Couldn't initialize the offscreen video driver: %s",
+                SDL_GetError());
+        return 1;
+    }
+
+    /* If OPENGL fails to init it will fallback to using a framebuffer for rendering */
+    window = SDL_CreateWindow("Offscreen Test", width, height, 0);
+
+    if (!window) {
+        SDL_Log("Couldn't create window: %s", SDL_GetError());
+        return 1;
+    }
+
+    renderer = SDL_CreateRenderer(window, NULL);
+
+    if (!renderer) {
+        SDL_Log("Couldn't create renderer: %s",
+                SDL_GetError());
+        return 1;
+    }
+
+    SDL_RenderClear(renderer);
+
+#ifndef SDL_PLATFORM_EMSCRIPTEN
+    /* Main render loop */
+    frames = 0;
+    then = SDL_GetTicks();
+    done = 0;
+#endif
+
+    SDL_Log("Rendering %u frames offscreen", max_frames);
+
+#ifdef SDL_PLATFORM_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", max_frames - frames, fps);
+            }
+        }
+    }
+#endif
+
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+    SDLTest_CommonDestroyState(state);
+
+    return 0;
+}
-- 
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