//水波纹效果
CCEffect %{
  techniques:
  - passes:
    - vert: vs
      frag: fs
      blendState:
        targets:
        - blend: true
      rasterizerState:
        cullMode: none
      properties:
        texture: { value: white }
        u_resolution: { value: [1280,720] }
        u_time: { value: 1.0 }
}%

CCProgram vs %{ // 顶点Shader模块开始
  #include <cc-global>
  precision highp float;	  //定义float高精度
	in vec3 a_position; // 顶点Shader 从渲染管道里面获取的顶点信息,使用attribute来修饰;
	in vec2 a_uv0;   // 纹理坐标;
	out vec2 uv0;     // 传递给着色Shader，varying 来修饰，进行插值
	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 {
    vec4 UVoffset;
    vec2 u_resolution;
    float u_time;
    float rotated;
  };

  #define F cos(x-y)*cos(y),sin(x+y)*sin(y)

  vec2 s(vec2 p)
  {
    float d=u_time*0.2,x=8.*(p.x+d),y=8.*(p.y+d);
    return vec2(F);
  }
  void mainImage( out vec4 fragColor, in vec2 fragCoord )
  {
    // 换成resolution
    vec2 rs = u_resolution.xy;
    // 换成纹理坐标v_texCoord.xy
    vec2 uv = fragCoord;
    vec2 q = uv+2./u_resolution.x*(s(uv)-s(uv+rs));
    //反转y
    //q.y=1.-q.y;
    fragColor = texture2D(texture, q);
  }
  void main()
  {
    vec2 UVnormalize;
    UVnormalize.x = (uv0.x-UVoffset.x)/(UVoffset.z-UVoffset.x);
    UVnormalize.y = (uv0.y-UVoffset.y)/(UVoffset.w-UVoffset.y);
    if(rotated > 0.5)
    {
      float temp = UVnormalize.x;
      UVnormalize.x = UVnormalize.y;
      UVnormalize.y = 1.0 - temp;
    }
    mainImage(gl_FragColor, uv0.xy);
  }
}%