#extension GL_OES_standard_derivatives : enable

#ifdef GL_ES
precision mediump float;
#endif

uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;



void main( void ) {
  vec3 Color = vec3(0.1, 0.3, 0.9);
  float col = -0.2;
  vec2 a = (gl_FragCoord.xy * 2.0 - resolution) / min(resolution, resolution.y);
  for(float i=0.0;i<50.0;i++)
  {
    float si = sin(time + i * 0.05)/0.5;
    float co = cos(time + i * 0.05)*0.5;
    col += 0.01 / abs(length(a+vec2(si,co*si))- 0.1);
  }
  gl_FragColor = vec4(vec3(Color * col), 1.0);
}