// Copyright (c) 2017-2022 Xiamen Yaji Software Co., Ltd.

CCEffect %{
  techniques:
  - name: opaque
    passes:
    - vert: sky-vs
      frag: sky-fs
      properties: &props
        environmentMap:      { value: grey }
        positionScaling:     { value: 1.0, target: params.w, editor: { tooltip: 'Set a smaller value (such as less than 1.0) to remove the effects of fog' } }
        blendEnvironmentMap: { value: grey, editor: { parent: BLEND_ENV_MAP } }
        blendWeight:         { value: 0.0, target: params.x, editor: { parent: BLEND_ENV_MAP } }
        brightMultiplier:    { value: 1.0, target: params.y }
      priority : max - 10
      rasterizerState : &r1
        cullMode : none
      depthStencilState : &d1
        depthTest: true
        depthWrite : false

    - vert: sky-vs
      frag: sky-fs
      phase: deferred-forward
      propertyIndex: 0
      priority: max - 10
      rasterizerState: *r1
      depthStencilState: *d1
}%

CCProgram shared-ubos %{
  uniform Constants {
    vec4 params;
  };
}%

CCProgram surface-vertex %{
  #define CC_SURFACES_VERTEX_MODIFY_WORLD_POS
  vec3 SurfacesVertexModifyWorldPos(in SurfacesStandardVertexIntermediate In)
  {
    // Apply uniform scaling for atmosphere effects
    return cc_cameraPos.xyz + In.worldPos * params.w;
  }
}%

CCProgram surface-fragment %{
  uniform samplerCube environmentMap;
  #if BLEND_ENV_MAP
    uniform samplerCube blendEnvironmentMap;
  #endif
  #define CC_SURFACES_FRAGMENT_MODIFY_BASECOLOR_AND_TRANSPARENCY
  vec3 sampleEnvMap(samplerCube tex, vec3 R)
  {
    vec3 c = vec3(1.0);
    #if USE_RGBE_CUBEMAP
      c *= unpackRGBE(fragTextureLod(tex, R, 0.0));
    #else
      c *= SRGBToLinear(fragTextureLod(tex, R, 0.0).rgb);
    #endif
    return c;
  }
  vec4 SurfacesFragmentModifyBaseColorAndTransparency()
  {
    vec3 c = vec3(1.0);
    vec3 normal = normalize(FSInput_worldNormal);
    vec3 rotationDir = RotationVecFromAxisY(normal.xyz, cc_surfaceTransform.z, cc_surfaceTransform.w);
    c = sampleEnvMap(environmentMap, rotationDir);
    #if BLEND_ENV_MAP
      c = mix(c, sampleEnvMap(blendEnvironmentMap, rotationDir), params.x);
    #endif
    return vec4(c * cc_ambientSky.w * params.y, 1.0);
  }
}%

CCProgram sky-vs %{
  precision highp float;

  #include <surfaces/effect-macros/sky>
  #include <surfaces/includes/common-vs>
  #include <shared-ubos>
  #include <surface-vertex>
  #include <shading-entries/main-functions/misc/sky-vs>
}%


CCProgram sky-fs %{
  precision highp float;

  #include <surfaces/effect-macros/sky>
  #include <surfaces/includes/common-fs>
  #include <shared-ubos>
  #include <surface-fragment>
  #include <shading-entries/main-functions/misc/sky-fs>
}%