precision mediump float;

#endif

​

uniform vec2 u_resolution;

uniform float u_time;

​

void main() {

  vec2 coord = (gl_FragCoord.xy / u_resolution.xy);

  float color = 0.0;

  color += sin(coord.x * 50.0 + cos(u_time + coord.y * 10.0 + sin(coord.x * 50.0 + u_time * 2.0))) * 2.0;

  color += cos(coord.x * 40.0 + sin(u_time + coord.y * 10.0 + cos(coord.x * 50.0 + u_time * 2.0))) * 2.0;

  color += sin(coord.x * 30.0 + cos(u_time + coord.y * 10.0 + sin(coord.x * 50.0 + u_time * 2.0))) * 2.0;

  color += cos(coord.x * 10.0 + sin(u_time + coord.y * 10.0 + cos(coord.x * 50.0 + u_time * 2.0))) * 2.0;

​

  gl_FragColor = vec4(vec3(color + coord.y, coord.x, 1.0), 1.0);

}