#define ITERS 12
const float scale = 2.;
const float scale1 = 1.16;

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    fragColor = vec4(0.0);
    vec3 col=vec3(0.0),col_prev=vec3(0.0);
    vec2 uv = -(fragCoord.yx*10.0-iResolution.yx)/iResolution.y/20.0;
    //uv.y += (iTime)/25.0;
    float s1 = (iTime)/16.;
    float spin = scale1+fract(s1/scale1/2.)*2.;
    for(int c=0;c<ITERS;c++){
        col_prev = col;
        for(int i=0;i<ITERS;i++)
        {

            uv= -(-uv-((vec2(uv.x/scale+uv.y/scale1,uv.y/scale+uv.x/scale1)/(scale))))/scale1;
            uv.x *= -spin;
            uv = (uv);
            uv.y /= spin;
            uv = fract(uv.yx);
            //uv /= 1.01;
        }
        col[2] = abs(uv.y-uv.x);
        col = ((col+col_prev.yzx))/2.125;
	}
    fragColor = vec4(vec3(col*3.0),1.0);

}