//马赛克

CCEffect %{
  techniques:
  - passes:
    - vert: vs
      frag: fs
      blendState:
        targets:
        - blend: true
      rasterizerState:
        cullMode: none
      properties:
        texture: { value: white }
        u_resolution: { value: [1280,720] }
        u_mosaicSize: { value: 12 }
}%

CCProgram vs %{
  #include <cc-global>
  precision highp float;
  in vec3 a_position;
  in vec2 a_uv0;
  out vec2 uv0;
  void main () {
      gl_Position = cc_matViewProj * vec4(a_position, 1);
      uv0 = a_uv0;
  }
}%

CCProgram fs %{
  precision highp float;
  in vec2 uv0;
  uniform sampler2D texture;
  uniform ARGS {
    vec2 u_resolution;
    float u_mosaicSize;
  };
  void main(void)
  {
      vec4 color;
      vec2 xy = vec2(uv0.x * u_resolution.x, uv0.y * u_resolution.y);
      vec2 xyMosaic = vec2(floor(xy.x / u_mosaicSize) * u_mosaicSize, floor(xy.y / u_mosaicSize) * u_mosaicSize);
      vec2 uvMosaic = vec2(xyMosaic.x / u_resolution.x, xyMosaic.y / u_resolution.y);
      color = texture2D( texture, uvMosaic);
      gl_FragColor = color; 
  }
}%