/* * sudo apt-get install libsdl1.2-dev * gcc -o sdltest sdltest.c -I/usr/include/SDL -lSDL * */ #include #include #define WIDTH 640 #define HEIGHT 480 #define BPP 4 #define DEPTH 32 void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b) { Uint32 *pixmem32; Uint32 colour; colour = SDL_MapRGB( screen->format, r, g, b ); pixmem32 = (Uint32*) screen->pixels + y + x; *pixmem32 = colour; } void DrawScreen(SDL_Surface* screen, int h) { int x, y, ytimesw; if(SDL_MUSTLOCK(screen)) { if(SDL_LockSurface(screen) < 0) return; } for(y = 0; y < screen->h; y++ ) { ytimesw = y*screen->pitch/BPP; for( x = 0; x < screen->w; x++ ) { setpixel(screen, x, ytimesw, (x*x)/256+3*y+h, (y*y)/256+x+h, h); } } if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen); SDL_Flip(screen); } int main(int argc, char* argv[]) { SDL_Surface *screen; SDL_Event event; int keypress = 0; int h=0; if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1; if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_HWSURFACE))) { SDL_Quit(); return 1; } while(!keypress) { DrawScreen(screen,h++); while(SDL_PollEvent(&event)) { switch (event.type) { case SDL_QUIT: keypress = 1; break; case SDL_KEYDOWN: keypress = 1; break; } } } SDL_Quit(); return 0; }