[SDL] Czyszczenie ekranu/okna

#include <SDL/SDL.h>
#include <iostream>

bool Event();

int r, g, b;

int main( int argc, char * argv[] )
{
    SDL_Init( SDL_INIT_EVERYTHING );
   
    r = 255;
    g = 200;
    b = 255;
   
    SDL_Surface * screen;
    screen = SDL_SetVideoMode( 640, 480, 32, SDL_SWSURFACE );
    SDL_Flip( screen );
   
    SDL_Surface * sprite = SDL_CreateRGBSurface( SDL_SWSURFACE, 100, 100, screen->format->BitsPerPixel,
    screen->format->Rmask, screen->format->Gmask, screen->format->Bmask, screen->format->Amask );
    SDL_FillRect( sprite, NULL, SDL_MapRGB( sprite->format, 255, 255, 0 ) );
    SDL_Rect rect;
    rect.x = 270;
    rect.y = 190;
    rect.w = 100;
    rect.h = 100;
   
    while( Event() )
    {
        SDL_FillRect( screen, NULL, SDL_MapRGB( screen->format, r, g, b ) ); // CLEAR
       
        //RESZTA KODU GRY
        SDL_BlitSurface( sprite, NULL, screen, & rect ); // Rysujemy sobie jakiegoś sprajta
       
        SDL_Flip( screen ); // SHOW
    }
   
    SDL_Quit();
    return 0;
}

bool Event()
{
    SDL_Event event;
    while( SDL_PollEvent( & event ) )
    {
        if( event.type == SDL_QUIT )
        {
            return false;
            break;
        }
    }
   
    return true;
}