vec2 Hash(vec2 P) {
 	return fract(cos(P*mat2(-64.2,71.3,81.4,-29.8))*8321.3); 
}
float Worley(vec2 P) {
    float Dist = 1.;
    vec2 I = floor(P);
    vec2 F = fract(P);
    
    for(int X = -1;X<=1;X++)
    for(int Y = -1;Y<=1;Y++)
    {
        float D = distance(Hash(I+vec2(X,Y))+vec2(X,Y),F);
        Dist = min(Dist,D);
    }
    return Dist;
	
}
void main() {
	gl_FragColor = vec4(vec3(Worley(gl_FragCoord.xy/32.0+u_time)),1.0);
}


//created by jarreed0 at shadergrounds.com