// Copyright (c) 2017-2020 Xiamen Yaji Software Co., Ltd.

CCEffect %{
  techniques:
  - passes:
    - vert: sprite-vs:vert
      frag: sprite-fs:frag
      depthStencilState:
        depthTest: false
        depthWrite: false
      blendState:
        targets:
        - blend: true
          blendSrc: src_alpha
          blendDst: one_minus_src_alpha
          blendDstAlpha: one_minus_src_alpha          
      rasterizerState:
        cullMode: none
      properties:
        alphaThreshold: { value: 0.5 }
        # 自定义参数
        hitwhit: {value: 0.0}
        noiceTx: {value: white}
        glowThreshold: {
          value: 0.1,
          editor: {
            tooltip: "发光阈值（只有超过这个透明度的点才会发光）",
            range: [0.0, 1.0]
          }
        }     
}%

CCProgram sprite-vs %{
  precision highp float;
  #include <builtin/uniforms/cc-global>
  #if USE_LOCAL
    #include <builtin/uniforms/cc-local>
  #endif

  in vec3 a_position;
  in vec2 a_texCoord;
  in vec4 a_color;
  
  out vec4 v_color;
  out vec2 v_uv0;

  #if USE_TEXTURE
    in vec2 a_uv0;
  #endif

  vec4 vert (){
    vec4 pos = vec4(a_position, 1);

    #if USE_LOCAL
      pos = cc_matWorld * pos;
    #endif

    #if USE_PIXEL_ALIGNMENT
      pos = cc_matView * pos;
      pos.xyz = floor(pos.xyz);
      pos = cc_matProj * pos;
    #else
      pos = cc_matViewProj * pos;
    #endif

    #if USE_TEXTURE
      v_uv0 = a_uv0;
    #endif

    v_color = a_color;

    v_uv0 = a_texCoord;

    return pos;
  }
}%


CCProgram sprite-fs %{
  precision highp float;
  #include <builtin/internal/embedded-alpha>
  #include <builtin/internal/alpha-test>

  in vec4 v_color;

  #if USE_TEXTURE
    in vec2 v_uv0;
    #pragma builtin(local)
    layout(set = 2, binding = 11) uniform sampler2D cc_spriteTexture;
  #endif

  uniform sampler2D noiceTx;

  // 定义向周边搜索的圈数
  #pragma define range 5.0

  #if SHOW_INNER_GLOW

    uniform glow {

      // 闪白进度
      float hitwhit;

      // 发光阈值
      float glowThreshold;

      // 特别地，必须是 vec4 先于 float 声明
    };

    vec4 getTextureColor(sampler2D mainTexture, vec2 v_uv0) {
      if (v_uv0.x > 1.0 || v_uv0.x < 0.0 || v_uv0.y > 1.0 || v_uv0.y < 0.0) {
        return vec4(0.0, 0.0, 0.0, 0.0);
      }
      return CCSampleWithAlphaSeparated(mainTexture, v_uv0);
    }
  #endif


  vec4 frag () {
    vec4 o = vec4(1, 1, 1, 1);
    vec4 white = vec4(1 , 1 ,1, 1);
    vec4 burnColor = vec4(0, 0, 0.8, 1);
    float vcolorA = v_color.a;

    #if USE_TEXTURE
      o *= CCSampleWithAlphaSeparated(cc_spriteTexture, v_uv0);
      #if IS_GRAY
        float gray  = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;
        o.r = o.g = o.b = gray;
      #endif
      #if CC_USE_ALPHA_ATLAS_TEXTURE
        o.a *= texture2D(cc_spriteTexture, v_uv0 + vec2(0, 0.5)).r;
      #endif
    #endif

    // o *= v_color;
    //废弃a的透明度作用
    // o.rgb *= v_color.rgb;
    
    #if SHOW_INNER_GLOW
      vec4 color_dest = o;

      if(hitwhit > 0.){
        //下面那坨阴影就不闪白了吧 //&& v_uv0.y <= 0.90
        if(color_dest.a > 0.02 ){
          o = white * hitwhit + color_dest;
        }else{
          o = color_dest;
        }
      }

      //利用v_color.r 实现冰冻减速内发光 r控制蓝色内发光开关
      vec4 innerLightParam = vec4(1,1,1,1);
      innerLightParam.r = o.a;
      innerLightParam.g = 1. - abs(v_uv0.x - 0.5) * 0.5 ;
      innerLightParam.b = 1. - abs(v_uv0.y - 0.5) * 0.5 ;
      innerLightParam.a = innerLightParam.g * innerLightParam.b * 0.8;
      if(innerLightParam.r < 0.08){
          innerLightParam.a = 0.;
      }
      vec4 color_src = burnColor * innerLightParam.a;

      // 源颜色（内发光）
      if(v_color.r < 0.1){  
        o = color_src * color_src.a + color_dest;
      }
    #endif
      
    //闪白
    //利用alpha通道 实现不打断合批的 受击闪白 a越接近1.0 白图影响越大
    //弃用了v_color.a的意义 //消融的时候不闪白
    if(v_color.g == 1. && abs(vcolorA) > .01){
      o.rgb = o.rgb * (1.0 - vcolorA) + white.rgb * vcolorA;
    }

    //消融
    //v_color.g
    if(v_color.g != 1.){

      //改为step方式
      float disFactor = 1.0;
      disFactor *= step(o.b,v_color.g) * step(o.r, v_color.g) * step(o.g,v_color.g);
      if(disFactor == 1.){
        discard;
      }

      disFactor = 1.0;
      disFactor *= step(v_color.g,0.2) * step(o.b,v_color.g+0.2);
      o.rgb = mix(o.rgb, vec3(.2,.6,.2), disFactor);



    }

    return o;
  }
}%