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

CCEffect %{
  techniques:
  - passes:
    - vert: planar-shadow-vs:vert
      frag: planar-shadow-fs:frag
      phase: planarShadow
      depthStencilState:
        depthTest: true
        depthWrite: false
        stencilTestFront: true
        stencilFuncFront: not_equal
        stencilPassOpFront: replace
        stencilRef: 0x80 # only use the leftmost bit
        stencilReadMask: 0x80
        stencilWriteMask: 0x80
      blendState:
        targets:
        - blend: true
          blendSrc: src_alpha
          blendDst: one_minus_src_alpha
          blendDstAlpha: one_minus_src_alpha
}%

CCProgram planar-shadow-vs %{
  precision highp float;
  #include <legacy/input>
  #include <builtin/uniforms/cc-global>
  #include <legacy/decode-base>
  #include <legacy/local-batch>
  #include <builtin/uniforms/cc-shadow>
  #include <common/lighting/functions>

  out float v_dist;

  vec4 vert () {
    vec4 position;
    CCVertInput(position);
    // World Space
    mat4 matWorld, matWorldIT;
    CCGetWorldMatrixFull(matWorld, matWorldIT);
    vec3 worldPos = (matWorld * position).xyz;
    vec4 shadowPos = CalculatePlanarShadowPos(worldPos, cc_cameraPos.xyz, cc_mainLitDir.xyz, cc_planarNDInfo);
    position = CalculatePlanarShadowClipPos(shadowPos, cc_cameraPos.xyz, cc_matView, cc_matProj, cc_nearFar, cc_shadowWHPBInfo.w);
    v_dist = shadowPos.w;
    return position;
  }
}%

CCProgram planar-shadow-fs %{
  precision highp float;
  #include <builtin/uniforms/cc-shadow>
  #include <legacy/output>

  in float v_dist;

  vec4 frag () {
    if(v_dist < 0.0)
      discard;
    return CCFragOutput(cc_shadowColor);
  }
}%