uniform float time;
uniform vec2 resolution;

void main(void)
{
    vec2 p = (2.0*gl_FragCoord.xy-resolution)/resolution.y;

    float r = length(p);
    float a = atan(p.x,p.y);

    float f = cos(p.y*12.0/(r*r) + time)*cos(p.x* 3.0/(r*r) + time);
    vec3 col = vec3( cos(a+0.0), cos(a+0.5), cos(a+1.0) ) *f + f*f*f*f + 0.2/r;

    gl_FragColor = vec4(col,1.0);
}