#!/bin/sh
tail -n1 $0>_.c;gcc -lSDL _.c -o _;_
main(){int i,j,k=2048,*s=SDL_SetVideoMode(k,k,32);for(;++j;SDL_UpdateRect(s,0,0,0,i=0))for(;i<k*k;*(*(char**)(s+8)+i*4)=(i++%k^i/k)+j);}