// Copyright (c) 2017-2020 Xiamen Yaji Software Co., Ltd.
CCEffect %{
  techniques:
  - name: opaque
    passes:
    - vert: camera-texture-vs:vert
      frag: camera-texture-fs:frag
      properties: &props
        mainTexture:    { value: grey }
        tilingOffset:   { value: [1, 1, 0, 0] }
        mainColor:      { value: [1, 1, 1, 1], editor: { type: color } }
        colorScale:     { value: [1, 1, 1], target: colorScaleAndCutoff.xyz }
        alphaThreshold: { value: 0.5, target: colorScaleAndCutoff.w, editor: { parent: USE_ALPHA_TEST } }
        color:          { target: mainColor, editor: { visible: false } } # backward compability
      migrations: &migs
        properties:
          mainColor:    { formerlySerializedAs: color }
  - name: transparent
    passes:
    - vert: camera-texture-vs:vert
      frag: camera-texture-fs:frag
      depthStencilState: &d1
        depthTest: true
        depthWrite: false
      blendState:
        targets:
        - blend: true
          blendSrc: src_alpha
          blendDst: one_minus_src_alpha
          blendDstAlpha: one_minus_src_alpha
      properties: *props
      migrations: *migs
  - name: add
    passes:
    - vert: camera-texture-vs:vert
      frag: camera-texture-fs:frag
      rasterizerState: &r1 { cullMode: none }
      depthStencilState: *d1
      blendState:
        targets:
        - blend: true
          blendSrc: src_alpha
          blendDst: one
          blendSrcAlpha: src_alpha
          blendDstAlpha: one
      properties: *props
      migrations: *migs
  - name: alpha-blend
    passes:
    - vert: camera-texture-vs:vert
      frag: camera-texture-fs:frag
      rasterizerState: *r1
      depthStencilState: *d1
      blendState:
        targets:
        - blend: true
          blendSrc: src_alpha
          blendDst: one_minus_src_alpha
          blendSrcAlpha: src_alpha
          blendDstAlpha: one_minus_src_alpha
      properties: *props
      migrations: *migs
}%

CCProgram camera-texture-vs %{
  precision highp float;
  #include <legacy/input>
  #include <builtin/uniforms/cc-global>
  #include <legacy/decode-base>
  #include <legacy/local-batch>
  #include <legacy/input>

  #if USE_VERTEX_COLOR
    in lowp vec4 a_color;
    out lowp vec4 v_color;
  #endif

  #if USE_TEXTURE
    out vec2 v_uv;
    uniform TexCoords {
      vec4 tilingOffset;
    };
  #endif

  vec4 vert () {
    vec4 position;
    CCVertInput(position);

    mat4 matWorld;
    CCGetWorldMatrix(matWorld);

    #if USE_TEXTURE
      v_uv = a_texCoord * tilingOffset.xy + tilingOffset.zw;
      #if SAMPLE_FROM_RT
        CC_HANDLE_RT_SAMPLE_FLIP(v_uv);
      #endif
    #endif

    #if USE_VERTEX_COLOR
      v_color = a_color;
    #endif

    return cc_matProj * (cc_matView * matWorld) * position;
  }
}%

CCProgram camera-texture-fs %{
  precision highp float;
  #include <legacy/output>

  #if USE_ALPHA_TEST
    #pragma define-meta ALPHA_TEST_CHANNEL options([a, r, g, b])
  #endif

  #if USE_TEXTURE
    in vec2 v_uv;
    uniform sampler2D mainTexture;
  #endif

  uniform Constant {
    vec4 mainColor;
    vec4 colorScaleAndCutoff;
  };

  #if USE_VERTEX_COLOR
    in lowp vec4 v_color;
  #endif

  vec4 frag () {
    vec4 o = mainColor;
    o.rgb *= colorScaleAndCutoff.xyz;

    #if USE_VERTEX_COLOR
      o *= v_color;
    #endif

    #if USE_TEXTURE
      o *= texture(mainTexture, v_uv);
    #endif

    #if USE_ALPHA_TEST
      if (o.ALPHA_TEST_CHANNEL < colorScaleAndCutoff.w) discard;
    #endif

    return CCFragOutput(o);
  }
}%