precision mediump float;

#endif

​

uniform vec2 u_resolution;

uniform float u_time;

uniform vec2 u_mouse;

​

void main() {

  vec2 coord = gl_FragCoord.xy / u_resolution;

  vec3 color = vec3(0.0);

  vec2 translate = vec2(-0.5);

  coord += translate;

  color.r = abs(0.1 + length(coord) - 0.6 * abs(sin(u_time * 0.9 / 12.0)));

  color.g = abs(0.1 + length(coord) - 0.6 * abs(sin(u_time * 0.6 / 4.0)));

  color.b = abs(0.1 + length(coord) - 0.6 * abs(sin(u_time * 0.3 / 9.0)));

  gl_FragColor = vec4(0.05 / color, 1.0);

}