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

CCEffect %{
  techniques:
  - passes:
    - vert: vs
      frag: fs
      blendState:
        targets:
        - blend: true
      rasterizerState:
        cullMode: none
      properties:
        texture: { value: white }
        u_ratio: { value: 0.0 }
}%


CCProgram vs %{
  precision highp float;

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

  in vec3 a_position;
  in vec4 a_color;
  #if USE_TINT
    in vec4 a_color0;
  #endif
  out vec4 v_color;

  #if USE_TEXTURE
  in vec2 a_uv0;
  out vec2 v_uv0;
  #endif
  #if USE_TINT
    out vec4 v_dark;
  #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;
    #if USE_TINT
      v_dark = a_color0;
    #endif

    gl_Position = pos;
  }
}%


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

  in vec4 v_color;
  #if USE_TINT
    in vec4 v_dark;
  #endif

  uniform ARGS {
    float u_ratio;
  };

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

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

    #if USE_TEXTURE
      CCTexture(texture, v_uv0, o);
    #endif

    float ratio = u_ratio + 1.0;
    float mid = 1.0 / ratio;

    if (o.r <= mid) {
        o.r = ratio * o.r * v_color.r;
    } else {
        o.r = 1.0 - ratio * (1.0 - o.r) * (1.0 - v_color.r);
    }
    if (o.g <= mid) {
        o.g = ratio * o.g * v_color.g;
    } else {
        o.g = 1.0 - ratio * (1.0 - o.g) * (1.0 - v_color.g);
    }
    if (o.b <= mid) {
        o.b = ratio * o.b * v_color.b;
    } else {
        o.b = 1.0 - ratio * (1.0 - o.b) * (1.0 - v_color.b);
    }
    o.a = o.a * v_color.a;

    ALPHA_TEST(o);

    gl_FragColor = o;
  }
}%