cocos-creator-template/assets/effects/internal/builtin-occlusion-query.effect

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

CCEffect %{
  techniques:
  - passes:
    - vert: occlusion-query-vs:vert
      frag: occlusion-query-fs:frag
      depthStencilState:
        depthTest: true
        depthWrite: false
      rasterizerState:
        cullMode: back
      blendState:
        targets:
        - blendColorMask: 0
}%

CCProgram occlusion-query-vs %{
  precision highp float;
  #include <builtin/uniforms/cc-global>
  #include <builtin/uniforms/cc-world-bound>

  layout(location = 0) in vec3 a_position;

  vec4 vert () {
    vec4 position;
    position = vec4(a_position, 1.0);

    position *= cc_worldBoundHalfExtents;
    position += cc_worldBoundCenter;

    position = cc_matViewProj * position;

    return position;
  }
}%

CCProgram occlusion-query-fs %{
  precision mediump float;

  vec4 frag () {
    return vec4(1, 0, 0, 1);
  }
}%