| 15 | } |
| 16 | |
| 17 | void draw(SDL_Window* window, SDL_Surface* surface) { |
| 18 | int x, y; |
| 19 | |
| 20 | if (SDL_MUSTLOCK(surface)) { |
| 21 | if (!SDL_LockSurface(surface)) { |
| 22 | sdlError("SDL_LockSurface"); |
| 23 | } |
| 24 | } |
| 25 | |
| 26 | for (y = 0; y < 256; y++) { |
| 27 | Uint32* p = (Uint32*)(((Uint8*)surface->pixels) + surface->pitch * y); |
| 28 | for (x = 0; x < 256; x++) { |
| 29 | *(p++) = SDL_MapSurfaceRGB(surface, x, x ^ y, y); |
| 30 | } |
| 31 | } |
| 32 | |
| 33 | if (SDL_MUSTLOCK(surface)) { |
| 34 | SDL_UnlockSurface(surface); |
| 35 | } |
| 36 | if (!SDL_UpdateWindowSurface(window)) { |
| 37 | sdlError("SDL_UpdateWindowSurface"); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | void verify(void) { |
| 42 | int res = EM_ASM_INT({ |