// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.  
// 高斯模糊

CCEffect %{
  techniques:
  - passes:
    - vert: vs
      frag: fs
      blendState:
        targets:
        - blend: true
      rasterizerState:
        cullMode: none
      properties:
        texture: { value: white }
        alphaThreshold: { value: 0.5 }
        # # 灰化程度
        # grayLevel: {
        #   value: 1.0,
        #   inspector: {
        #     tooltip: "灰化程度",
        #     range: [0.0, 1.0]
        #   }
        # }
}%


CCProgram vs %{
  precision highp float;

  #include <cc-global>
  #include <cc-local>

  in vec3 a_position;
  in vec4 a_color;
  out vec4 v_color;

  #if USE_TEXTURE
  in vec2 a_uv0;
  out vec2 v_uv0;
  #endif

  void main () {
    vec4 pos = vec4(a_position, 1);

    #if CC_USE_MODEL
    pos = cc_matViewProj * cc_matWorld * pos;
    #else
    pos = cc_matViewProj * pos;
    #endif

    #if USE_TEXTURE
    v_uv0 = a_uv0;
    #endif

    v_color = a_color;

    gl_Position = pos;
  }
}%


CCProgram fs %{
  precision highp float;
  
  #include <alpha-test>

  in vec4 v_color;

  #if USE_TEXTURE
  in vec2 v_uv0;
  uniform sampler2D texture;
  #endif

  #if ENABLE_GAUSSIAN_BLUR

  // 定义无理数
  #define e 2.718281828459045

  // 定义标准方差值
  #define stdDev 0.84089642

  // 定义π
  #define pi 3.141592653589793

  // // 接收外部变量
  // uniform GaussianBlur {
  // }

  float getGaussianBlur()


  // float matrix[4]; 
  // float matrix[0] = 0.0;
  #endif

  void main () {
    vec4 o = vec4(1, 1, 1, 1);

    #if USE_TEXTURE
    o *= texture(texture, v_uv0);
      #if CC_USE_ALPHA_ATLAS_TEXTURE
      o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;
      #endif
    #endif

    o *= v_color;

    ALPHA_TEST(o);

    #if ENABLE_GAUSSIAN_BLUR
    #endif
    gl_FragColor = o;
  }
}%