precision mediump float;

#endif

​

uniform vec2 u_resolution;

uniform float u_time;

​

void main() {

  vec2 coord = gl_FragCoord.xy / u_resolution;

  vec3 color = vec3(0.0);

  vec2 translate = vec2(-0.5, -0.5);

  coord += translate;

  for (int i = 0; i < 40; i++){

    float radius = 0.3;

    float rad = radians(360.0 / 40.0) * float(i);

    color.r += 0.006 / length(coord + vec2(radius * cos(rad), radius * sin(rad)));

    color.g += 0.001 / length(coord + vec2(radius * cos(rad), radius * sin(rad)));

    color.b += 0.005 / length(coord + vec2(radius * cos(rad + 12.0), radius * sin(rad)));

  }

  gl_FragColor = vec4(color.r, color.g, color.b, 1.0);

}