gistfile1.txt

#if GL_FRAGMENT_PRECISION_HIGH == 1
  precision highp int;
  precision highp float;
#endif
uniform sampler2D uSampler;
uniform float time;
uniform float baseRotation1;
uniform float rotationSpeed1;
uniform float baseRotation2;
uniform float rotationSpeed2;
uniform float sliceAngle;
uniform float mirrorSlices;
uniform vec2 zoom;
uniform vec2 resolution;
uniform vec2 aspect;
uniform vec2 center;
uniform vec2 mouseOffset;
uniform bool pinch;
void main( void ) {
    vec2 position = -aspect.xy + 2.0 * gl_FragCoord.xy / resolution.xy * aspect.xy;
  float radius = length(position);
  float angle = atan(position.y,position.x)+baseRotation1;
  float slice = mod((angle+time*rotationSpeed1), (sliceAngle*2.0));
  if (mirrorSlices * slice>sliceAngle)
  {
      slice = (2.0*sliceAngle-slice);
  }
  if(pinch)
  {
      float rot2 = baseRotation2 + time*rotationSpeed2;
    rot2 = atan(position.y,position.x)+baseRotation2 + time*rotationSpeed2;
    gl_FragColor = texture2D(uSampler, ( center + length( center ) * vec2( cos(rot2), sin(rot2)) +  mouseOffset +  vec2( cos(slice), sin(slice)) * radius) * zoom );
  } else {
      float rot2 = baseRotation2 + time*rotationSpeed2;
    vec2 rot = vec2(sin(rot2),cos(rot2));
    vec2 pos = vec2( cos(slice), sin(slice)) * radius + center ;
    gl_FragColor = texture2D(uSampler, (vec2(pos.x * rot.y + pos.y * rot.x,pos.y * rot.y - pos.x * rot.x)) * zoom  +  mouseOffset, -1.0);
  }
}