Test program for emscripten bug with SDL_MapRGB

sdl_colors.c

#include <SDL/SDL.h>

#ifdef EMSCRIPTEN
#include <emscripten.h>
// Implementation of SDL_MapRGB and SDL_MapRGBA that isn't totally broken:
// #define SDL_MapRGB(fmt,r,g,b) (0xff+((b)<<8)+((g)<<16)+((r)<<24))
// #define SDL_MapRGBA(fmt,r,g,b,a) ((a)+((b)<<8)+((g)<<16)+((r)<<24))
#endif

void one() {
  SDL_Event event;
  while (SDL_PollEvent(&event)) 1;
}

int main() {
  Uint32 c;
  SDL_Rect rect = {0,0,300,450};

  SDL_Init(SDL_INIT_VIDEO);
  SDL_Surface *screen = SDL_SetVideoMode(600, 450, 32, SDL_HWSURFACE);

  c = SDL_MapRGB(screen->format, 0xff, 0x00, 0x00); // OPAQUE RED
  SDL_FillRect(screen, &rect, c);
  rect.x = 300;
  c = SDL_MapRGB(screen->format, 0x7f, 0x7f, 0x00); // OPAQUE MUSTARD
  SDL_FillRect(screen, &rect, c);
  SDL_UpdateRect(screen, 0, 0, 600, 450);

#ifdef EMSCRIPTEN
  emscripten_set_main_loop(one, 0);
#else
  while (1) { one(); SDL_WaitEvent(NULL); }
#endif

  return 0;
}