SDL 1.2 Multitouch sample

#include <SDL.h>

SDL_Surface *screen;

Uint32 colors[SDL_MAXMOUSE];

void put_square(int x, int y, int color)
{
    SDL_Rect rect = { x - 5, y - 5, 10, 10};
    SDL_FillRect(screen, &rect, color);
}

static Uint32 timer(Uint32 interval, void * param)
{
    SDL_Event event;
    event.type = SDL_VIDEOEXPOSE;
    SDL_PushEvent(&event);
    return interval;
}

int main(int argc, char **argv)
{
    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);

    screen = SDL_SetVideoMode(0, 0, 32, SDL_HWSURFACE | SDL_FULLSCREEN);

    printf("Starting\n");

    colors[0] = SDL_MapRGB(screen->format, 255, 0, 0);
    colors[1] = SDL_MapRGB(screen->format, 0, 255, 0);
    colors[2] = SDL_MapRGB(screen->format, 0, 0, 255);
    colors[3] = SDL_MapRGB(screen->format, 255, 0, 255);
    colors[4] = SDL_MapRGB(screen->format, 255, 255, 0);
    colors[5] = SDL_MapRGB(screen->format, 0, 255, 255);

    SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 255, 255, 255));
    SDL_Flip(screen);

    SDL_AddTimer(20, timer, NULL);

    SDL_Event event;
    while (SDL_WaitEvent(&event)) {
        switch (event.type) {
            case SDL_QUIT:
                goto quit;
            case SDL_MOUSEMOTION:
                put_square(event.motion.x, event.motion.y, colors[event.motion.which]);
                break;
            case SDL_VIDEOEXPOSE:
                SDL_Flip(screen);
                break;
        }
    }

quit:
    printf("Quitting\n");
    SDL_Quit();

    return 0;
}