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

CCEffect %{
  techniques:
  - name: single-sided
    passes:
    - vert: standard-vs
      frag: standard-fs
      embeddedMacros: { CC_FORCE_FORWARD_SHADING: true }
      rasterizerState:
        cullMode: Back
      depthStencilState: &d1
        depthTest: true
        depthWrite: false
      blendState: &b1
        targets:
        - blend: true
          blendSrc: one
          blendDst: src_alpha
          blendSrcAlpha: zero
          blendDstAlpha: one
      properties: &props
        tilingOffset:                     { value: [1.0, 1.0, 0.0, 0.0] }
        mainColor:                        { value: [0.05, 0.05, 0.05, 1.0], target: albedo, linear: true, editor: { displayName: Albedo, type: color } }
        albedoScale:                      { value: [1.0, 1.0, 1.0], target: albedoScaleAndCutoff.xyz }
        roughness:                        { value: 0.0, target: pbrParams.y, editor: { slide: true, range: [0, 1.0], step: 0.001 } }
        specularIntensity:                { value: 0.5, target: pbrParams.w, editor: { slide: true, range: [0.0, 1.0], step: 0.001 } }
        F0:                               { value: 0.5, target: emissiveScaleParam.x, editor: { slide: true, range: [0, 1.0], step: 0.001 } }
        F90:                              { value: 0.9, target: emissiveScaleParam.y, editor: { slide: true, range: [0.0, 1.0], step: 0.001 } }
        gradientColor:                    { value: [0.0, 0.05, 0.0, 1.0], linear: true, editor: { parent: USE_GRADIENT_COLOR, type: color } }
        gradientIntensity:                { value: 0.2, target: emissiveScaleParam.z, editor: { parent: USE_GRADIENT_COLOR, slide: true, range: [0, 1.0], step: 0.001 } }
        normalStrength:                   { value: 1.0, target: emissiveScaleParam.w, editor: { parent: USE_NORMAL_MAP, slide: true, range: [0, 5.0], step: 0.001 } }
        mainTexture:                      { value: grey, target: albedoMap, editor: { displayName: AlbedoMap } }
        normalMap:                        { value: normal }
        pbrMap:                           { value: grey }
    - &forward-add
      vert: standard-vs
      frag: standard-fs
      phase: forward-add
      propertyIndex: 0
      embeddedMacros: { CC_FORWARD_ADD: true }
      depthStencilState:
        depthFunc: equal
        depthTest: true
        depthWrite: false
      blendState:
        targets:
        - blend: true
          blendSrc: one
          blendDst: one
          blendSrcAlpha: zero
          blendDstAlpha: one
    - &shadow-caster
      vert: shadow-caster-vs
      frag: shadow-caster-fs
      phase: shadow-caster
      propertyIndex: 0
      rasterizerState:
        cullMode: front
      properties:
        tilingOffset:   { value: [1.0, 1.0, 0.0, 0.0] }
        mainColor:      { value: [1.0, 1.0, 1.0, 1.0], target: albedo, editor: { displayName: Albedo, type: color } }
        albedoScale:    { value: [1.0, 1.0, 1.0], target: albedoScaleAndCutoff.xyz }
        mainTexture:    { value: grey, target: albedoMap, editor: { displayName: AlbedoMap } }
    - &reflect-map
      vert: standard-vs
      frag: reflect-map-fs
      phase: reflect-map
      propertyIndex: 0
    - &planar-shadow
      vert: planar-shadow-vs
      frag: planar-shadow-fs
      phase: planar-shadow
      propertyIndex: 0
      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
    - &deferred
      vert: standard-vs
      frag: standard-fs
      pass: gbuffer
      phase: gbuffer
      embeddedMacros: { CC_PIPELINE_TYPE: 1 }
      propertyIndex: 0
  - name: two-sided
    passes:
    - vert: standard-vs
      frag: standard-fs
      embeddedMacros: { CC_FORCE_FORWARD_SHADING: true, TECHNIQUE_TWO_SIDE: true }
      rasterizerState:
        cullMode: Front
      properties: &props
        tilingOffset:                     { value: [1.0, 1.0, 0.0, 0.0] }
        mainColor:                        { value: [0.05, 0.05, 0.05, 1.0], target: albedo, linear: true, editor: { displayName: Albedo, type: color } }
        albedoScale:                      { value: [1.0, 1.0, 1.0], target: albedoScaleAndCutoff.xyz }
        roughness:                        { value: 0.0, target: pbrParams.y, editor: { slide: true, range: [0, 1.0], step: 0.001 } }
        specularIntensity:                { value: 0.5, target: pbrParams.w, editor: { slide: true, range: [0.0, 1.0], step: 0.001 } }
        F0:                               { value: 0.5, target: emissiveScaleParam.x, editor: { slide: true, range: [0, 1.0], step: 0.001 } }
        F90:                              { value: 0.9, target: emissiveScaleParam.y, editor: { slide: true, range: [0.0, 1.0], step: 0.001 } }
        gradientColor:                    { value: [0.0, 0.05, 0.0, 1.0], linear: true, editor: { parent: USE_GRADIENT_COLOR, type: color } }
        gradientIntensity:                { value: 0.2, target: emissiveScaleParam.z, editor: { parent: USE_GRADIENT_COLOR, slide: true, range: [0, 1.0], step: 0.001 } }
        normalStrength:                   { value: 1.0, target: emissiveScaleParam.w, editor: { parent: USE_NORMAL_MAP, slide: true, range: [0, 5.0], step: 0.001 } }
        mainTexture:                      { value: grey, target: albedoMap, editor: { displayName: AlbedoMap } }
        normalMap:                        { value: normal }
        pbrMap:                           { value: grey }
      depthStencilState: *d1
      blendState: *b1
    - vert: standard-vs
      frag: standard-fs
      embeddedMacros: { CC_FORCE_FORWARD_SHADING: true, TECHNIQUE_TWO_SIDE: true }
      rasterizerState:
        cullMode: Back
      propertyIndex: 0
      depthStencilState: *d1
      blendState: *b1
    - *forward-add
    - *shadow-caster
    - *planar-shadow
    - &deferred-forward
      vert: standard-vs
      frag: standard-fs
      phase: deferred-forward
      embeddedMacros: { CC_PIPELINE_TYPE: 0 }
      propertyIndex: 0
      depthStencilState: *d1
      blendState: *b1
}%

CCProgram shared-ubos %{
  uniform Constants {
    vec4 tilingOffset;
    vec4 albedo;
    vec4 albedoScaleAndCutoff;
    vec4 pbrParams;
    vec4 emissiveScaleParam;
    vec4 gradientColor;
  };
}%

CCProgram macro-remapping %{
  // ui displayed macros
  #pragma define-meta USE_VERTEX_COLOR
  #pragma define-meta USE_PROBE_REFRACTION editor({ tooltip: 'Use transparency technique when disabled, otherwise use opaque technique' })

  #define CC_SURFACES_USE_VERTEX_COLOR USE_VERTEX_COLOR
  #define CC_SURFACES_LIGHTING_TRANSMIT_SPECULAR USE_PROBE_REFRACTION
  #define CC_SURFACES_LIGHTING_USE_FRESNEL USE_PROBE_REFRACTION

  // depend on UI macros
#if USE_NORMAL_MAP
  #define CC_SURFACES_USE_TANGENT_SPACE 1
#endif
  // depend on technique macros
#if TECHNIQUE_TWO_SIDE
  #define CC_SURFACES_USE_TWO_SIDED 1
#endif
}%

CCProgram surface-vertex %{
  #define CC_SURFACES_VERTEX_MODIFY_UV
  void SurfacesVertexModifyUV(inout SurfacesStandardVertexIntermediate In)
  {
    In.texCoord = In.texCoord * tilingOffset.xy + tilingOffset.zw;
  #if CC_SURFACES_USE_SECOND_UV
    In.texCoord1 = In.texCoord1 * tilingOffset.xy + tilingOffset.zw;
  #endif
  }
}%

CCProgram surface-fragment %{
  #if USE_ALBEDO_MAP
    uniform sampler2D albedoMap;
    #pragma define-meta ALBEDO_UV options([v_uv, v_uv1])
  #endif
  #if USE_NORMAL_MAP
    uniform sampler2D normalMap;
    #pragma define-meta NORMAL_UV options([v_uv, v_uv1])
  #endif
  #if USE_PBR_MAP
    uniform sampler2D pbrMap;
  #endif
  #pragma define-meta DEFAULT_UV options([v_uv, v_uv1])

  #define CC_SURFACES_FRAGMENT_MODIFY_BASECOLOR_AND_TRANSPARENCY
  vec4 SurfacesFragmentModifyBaseColorAndTransparency()
  {
    vec4 baseColor = albedo;

    #if USE_VERTEX_COLOR
      baseColor.rgb *= SRGBToLinear(FSInput_vertexColor.rgb); // use linear
      baseColor.a *= FSInput_vertexColor.a;
    #endif

    #if USE_ALBEDO_MAP
      vec4 texColor = texture(albedoMap, ALBEDO_UV);
      texColor.rgb = SRGBToLinear(texColor.rgb);
      baseColor *= texColor;
    #endif

    baseColor.rgb *= albedoScaleAndCutoff.xyz;
    return baseColor;
  }

  #define CC_SURFACES_FRAGMENT_MODIFY_WORLD_NORMAL
  vec3 SurfacesFragmentModifyWorldNormal()
  {
    vec3 normal = FSInput_worldNormal;
    #if USE_NORMAL_MAP
      vec3 nmmp = texture(normalMap, NORMAL_UV).xyz - vec3(0.5);
      normal = CalculateNormalFromTangentSpace(nmmp, emissiveScaleParam.w, normalize(normal.xyz), normalize(FSInput_worldTangent), FSInput_mirrorNormal);
    #endif

    return normalize(normal);
  }

  #define CC_SURFACES_FRAGMENT_MODIFY_PBRPARAMS
  vec4 SurfacesFragmentModifyPBRParams()
  {
    vec4 pbr = pbrParams;
    pbr.x = 1.0;
    pbr.z = 1.0;
    #if USE_PBR_MAP
      vec4 res = texture(pbrMap, DEFAULT_UV);
      pbr.yw *= res.yw;
    #endif

    return pbr;
  }

  #include <common/lighting/bxdf>
  #include <surfaces/data-structures/standard>
  #define CC_SURFACES_FRAGMENT_MODIFY_SHARED_DATA
  void SurfacesFragmentModifySharedData(inout SurfacesMaterialData surfaceData)
  {
    vec3 viewDir = normalize(cc_cameraPos.xyz - surfaceData.worldPos);
    float NoVSat = saturate(dot(surfaceData.worldNormal, viewDir));

    #if !USE_PROBE_REFRACTION
      // final color = srcColor * F + dstColor * (1-F) * glassColor
      // srcAlpha = (1-F) * glassColorBright (use bright instead for one channel)
      // srcBlend = 1, dstBlend = srcAlpha
      float F0 = emissiveScaleParam.x, F90 = emissiveScaleParam.y;
      float fresnel = CalculateFresnelCoefficient(min(F0, F90), F90, NoVSat);
      surfaceData.baseColor.a = (1.0 - fresnel) * length(surfaceData.baseColor.rgb);
    #endif

    #if USE_GRADIENT_COLOR
      surfaceData.baseColor.rgb = lerp(gradientColor * albedoScaleAndCutoff, surfaceData.baseColor, pow(NoVSat, emissiveScaleParam.z)).rgb;
    #endif
  }

  #include <lighting-models/includes/common>
  #define CC_SURFACES_LIGHTING_MODIFY_FINAL_RESULT
  void SurfacesLightingModifyFinalResult(inout LightingResult result, in LightingIntermediateData lightingData, in SurfacesMaterialData surfaceData, in LightingMiscData miscData)
  {
    vec3 viewDir = normalize(cc_cameraPos.xyz - surfaceData.worldPos);
    float NoVSat = saturate(dot(surfaceData.worldNormal, viewDir));
    float F0 = emissiveScaleParam.x, F90 = emissiveScaleParam.y;
    float fresnel = CalculateFresnelCoefficient(min(F0, F90), F90, NoVSat);
    result.fresnel = vec3(fresnel);

    #if !USE_PROBE_REFRACTION
      // simply fix single blend source issue for bright color alpha blending
      float threshold = 0.5, bright = dot(result.environmentSpecular, vec3(0.33333));
      if (bright > threshold)
        result.environmentSpecular = result.environmentSpecular / bright * threshold;
    #endif
  }

  #define CC_SURFACES_LIGHTING_MODIFY_FOG
  vec3 CCSurfacesLightingModifyFog(float fogFactor, vec3 color, in SurfacesMaterialData surfaceData, in LightingResult lightingResult)
  {
    // according to blend mode is one + src_alpha, fogColor should apply inv_src_alpha while glass is fully fogged, otherwise glass will be much more brighter.
    vec3 fogColor = cc_fogColor.rgb * (1.0 - surfaceData.baseColor.a);
    return mix(fogColor.rgb, color.rgb, fogFactor);
  } 
}%

CCProgram standard-vs %{
  precision highp float;

  // 1. surface internal macros, for technique usage or remapping some user (material) macros to surface internal macros
  #include <macro-remapping>
  #include <surfaces/effect-macros/common-macros>

  // 2. common include with corresponding shader stage, include before surface functions
  #include <surfaces/includes/common-vs>

  // 3. user surface functions that can use user (effect) parameters (ubo Constants)
  //    see surfaces/default-functions/xxx.chunk
  #include <shared-ubos>
  #include <surface-vertex>

  // 4. surface include with corresponding shader stage and shading-model (optional)
  #include <surfaces/includes/standard-vs>

  // 5. shader entry with corresponding shader stage and technique usage/type
  #include <shading-entries/main-functions/render-to-scene/vs>
}%


CCProgram shadow-caster-vs %{
  precision highp float;
  #include <macro-remapping>
  #include <surfaces/effect-macros/render-to-shadowmap>
  #include <surfaces/includes/common-vs>
  #include <shared-ubos>
  #include <surface-vertex>
  #include <shading-entries/main-functions/render-to-shadowmap/vs>
}%

CCProgram planar-shadow-vs %{
  precision highp float;
  #include <macro-remapping>
  #include <surfaces/effect-macros/render-planar-shadow>
  #include <surfaces/includes/common-vs>
  #include <shared-ubos>
  #include <surface-vertex>
  #include <shading-entries/main-functions/render-planar-shadow/vs>
}%


CCProgram standard-fs %{
  // shading-model : standard
  // lighting-model : standard (isotropy / anisotropy pbr)
  // shader stage : fs
  // technique usage/type : render-to-scene

  precision highp float;
  // 1. surface internal macros, for technique usage or remapping some user (material) macros to surface internal macros
  #include <macro-remapping>
  #include <surfaces/effect-macros/common-macros>

  // 2. common include with corresponding shader stage, include before surface functions
  #include <surfaces/includes/common-fs>

  // 3. user surface functions that can use user (effect) parameters (ubo Constants)
  //    see surfaces/default-functions/xxx.chunk
  #include <shared-ubos>
  #include <surface-fragment>

  // 4. lighting-model (optional)
  #include <lighting-models/includes/standard>

  // 5. surface include with corresponding shader stage and shading-model (optional)
  #include <surfaces/includes/standard-fs>

  // 6. shader entry with corresponding shader stage and technique usage/type
  #include <shading-entries/main-functions/render-to-scene/fs>
}%

CCProgram shadow-caster-fs %{
  precision highp float;
  #include <macro-remapping>
  #include <surfaces/effect-macros/render-to-shadowmap>
  #include <surfaces/includes/common-fs>
  #include <shared-ubos>
  #include <surface-fragment>
  #include <shading-entries/main-functions/render-to-shadowmap/fs>
}%

CCProgram planar-shadow-fs %{
  precision highp float;
  #include <macro-remapping>
  #include <surfaces/effect-macros/render-planar-shadow>
  #include <surfaces/includes/common-fs>
  #include <shared-ubos>
  #include <surface-fragment>
  #include <shading-entries/main-functions/render-planar-shadow/fs>
}%

CCProgram reflect-map-fs %{
  precision highp float;
  #include <macro-remapping>
  #include <surfaces/effect-macros/common-macros>
  #include <surfaces/includes/common-fs>
  #include <shared-ubos>
  #include <surface-fragment>
  #include <lighting-models/includes/standard>
  #include <surfaces/includes/standard-fs>
  #include <shading-entries/main-functions/render-to-reflectmap/fs>
}%