🛠️🐜 Antkeeper superbuild with dependencies included
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174 lines
4.3 KiB
174 lines
4.3 KiB
/*
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Simple program: picks the offscreen backend and renders each frame to a bmp */
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#include "SDL.h"
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#include "SDL_stdinc.h"
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#include "SDL_opengl.h"
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static SDL_Renderer *renderer = NULL;
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static SDL_Window *window = NULL;
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static int done = SDL_FALSE;
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static int frame_number = 0;
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static int width = 640;
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static int height = 480;
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static unsigned int max_frames = 200;
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void
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draw()
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{
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SDL_Rect Rect;
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SDL_SetRenderDrawColor(renderer, 0x10, 0x9A, 0xCE, 0xFF);
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SDL_RenderClear(renderer);
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/* Grow based on the frame just to show a difference per frame of the region */
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Rect.x = 0;
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Rect.y = 0;
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Rect.w = (frame_number * 2) % width;
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Rect.h = (frame_number * 2) % height;
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SDL_SetRenderDrawColor(renderer, 0xFF, 0x10, 0x21, 0xFF);
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SDL_RenderFillRect(renderer, &Rect);
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SDL_RenderPresent(renderer);
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}
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void
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save_surface_to_bmp()
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{
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SDL_Surface* surface;
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Uint32 r_mask, g_mask, b_mask, a_mask;
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Uint32 pixel_format;
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char file[128];
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int bbp;
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pixel_format = SDL_GetWindowPixelFormat(window);
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SDL_PixelFormatEnumToMasks(pixel_format, &bbp, &r_mask, &g_mask, &b_mask, &a_mask);
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surface = SDL_CreateRGBSurface(0, width, height, bbp, r_mask, g_mask, b_mask, a_mask);
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SDL_RenderReadPixels(renderer, NULL, pixel_format, (void*)surface->pixels, surface->pitch);
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SDL_snprintf(file, sizeof(file), "SDL_window%" SDL_PRIs32 "-%8.8d.bmp",
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SDL_GetWindowID(window), ++frame_number);
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SDL_SaveBMP(surface, file);
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SDL_FreeSurface(surface);
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}
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void
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loop()
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{
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SDL_Event event;
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/* Check for events */
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while (SDL_PollEvent(&event)) {
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switch (event.type) {
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case SDL_QUIT:
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done = SDL_TRUE;
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break;
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}
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}
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draw();
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save_surface_to_bmp();
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#ifdef __EMSCRIPTEN__
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if (done) {
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emscripten_cancel_main_loop();
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}
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#endif
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}
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int
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main(int argc, char *argv[])
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{
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#ifndef __EMSCRIPTEN__
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Uint32 then, now, frames;
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#endif
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Force the offscreen renderer, if it cannot be created then fail out */
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if (SDL_VideoInit("offscreen") < 0) {
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SDL_Log("Couldn't initialize the offscreen video driver: %s\n",
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SDL_GetError());
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return SDL_FALSE;
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}
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/* If OPENGL fails to init it will fallback to using a framebuffer for rendering */
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window = SDL_CreateWindow("Offscreen Test",
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SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
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width, height, 0);
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if (!window) {
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SDL_Log("Couldn't create window: %s\n",
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SDL_GetError());
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return SDL_FALSE;
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}
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renderer = SDL_CreateRenderer(window, -1, 0);
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if (!renderer) {
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SDL_Log("Couldn't create renderer: %s\n",
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SDL_GetError());
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return SDL_FALSE;
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}
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SDL_RenderClear(renderer);
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srand((unsigned int)time(NULL));
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#ifndef __EMSCRIPTEN__
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/* Main render loop */
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frames = 0;
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then = SDL_GetTicks();
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done = 0;
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#endif
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SDL_Log("Rendering %u frames offscreen\n", max_frames);
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop(loop, 0, 1);
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#else
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while (!done && frames < max_frames) {
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++frames;
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loop();
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/* Print out some timing information, along with remaining frames */
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if (frames % (max_frames / 10) == 0) {
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now = SDL_GetTicks();
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if (now > then) {
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double fps = ((double) frames * 1000) / (now - then);
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SDL_Log("Frames remaining: %" SDL_PRIu32 " rendering at %2.2f frames per second\n", max_frames - frames, fps);
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}
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}
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}
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#endif
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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