Merge pull request #526 from Unity-Technologies/Refactor-Lit-shader

HDRenderPipeline: Split Lit and LayeredLit data file in several part to make it more readable

SampleScenes/HDTest/GraphicTest/LayeredTessellation/Material/Layer-2-woord-rock.mat

   m_PrefabInternal: {fileID: 0}
   m_Name: Layer-2-woord-rock
   m_Shader: {fileID: 4800000, guid: eab0538d9d5746246806a9611c04ac4d, type: 3}
-  m_ShaderKeywords: _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _HEIGHTMAP0 _HEIGHTMAP1
-    _NORMALMAP0 _NORMALMAP1 _NORMALMAP_TANGENT_SPACE0 _NORMALMAP_TANGENT_SPACE1 _NORMALMAP_TANGENT_SPACE2
-    _NORMALMAP_TANGENT_SPACE3 _TESSELLATION_PHONG
+  m_ShaderKeywords: _BLENDMODE_PRESERVE_SPECULAR_LIGHTING _DISPLACEMENT_LOCK_TILING_SCALE
+    _HEIGHTMAP0 _HEIGHTMAP1 _NORMALMAP0 _NORMALMAP1 _NORMALMAP_TANGENT_SPACE0 _NORMALMAP_TANGENT_SPACE1
+    _NORMALMAP_TANGENT_SPACE2 _NORMALMAP_TANGENT_SPACE3 _TESSELLATION_DISPLACEMENT
+    _TESSELLATION_PHONG _VERTEX_DISPLACEMENT_LOCK_OBJECT_SCALE
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
+    - _SubsurfaceRadiusMap0:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _SubsurfaceRadiusMap1:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _SubsurfaceRadiusMap2:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _SubsurfaceRadiusMap3:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _ThicknessMap0:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _ThicknessMap1:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _ThicknessMap2:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _ThicknessMap3:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
     m_Floats:
     - _AlbedoAffectEmissive: 0
     - _AlphaCutoff: 0.5
     - _DetailSmoothnessScale3: 1
     - _DisplacementLockObjectScale: 1
     - _DisplacementLockTilingScale: 1
-    - _DisplacementMode: 0
+    - _DisplacementMode: 3
     - _DistortionDepthTest: 0
     - _DistortionEnable: 0
     - _DistortionOnly: 0
     - _LinkDetailsWithBase1: 1
     - _LinkDetailsWithBase2: 1
     - _LinkDetailsWithBase3: 1
+    - _MaterialID: 1
     - _Metallic: 0
     - _Metallic0: 0
     - _Metallic1: 0
     - _PreRefractionPass: 0
     - _ShiverDirectionality: 0.5
     - _ShiverDrag: 0.2
-    - _ShowLayer0: 0
+    - _ShowLayer0: 1
     - _ShowLayer1: 0
     - _ShowLayer2: 0
     - _ShowLayer3: 0
     - _SrcBlend: 1
     - _StencilRef: 2
     - _Stiffness: 1
+    - _SubsurfaceProfile0: 0
+    - _SubsurfaceProfile1: 0
+    - _SubsurfaceProfile2: 0
+    - _SubsurfaceProfile3: 0
+    - _SubsurfaceRadius0: 1
+    - _SubsurfaceRadius1: 1
+    - _SubsurfaceRadius2: 1
+    - _SubsurfaceRadius3: 1
     - _SurfaceType: 0
     - _TessellationBackFaceCullEpsilon: -0.25
     - _TessellationFactor: 4
     - _TexWorldScale2: 1
     - _TexWorldScale3: 1
     - _TexWorldScaleBlendMask: 1
+    - _Thickness0: 1
+    - _Thickness1: 1
+    - _Thickness2: 1
+    - _Thickness3: 1
     - _UVBase0: 0
     - _UVBase1: 0
     - _UVBase2: 0

SampleScenes/HDTest/GraphicTest/LayeredTessellation/Material/Layer-2-woord-rock.mat.meta

 timeCreated: 1487270827
 licenseType: Pro
 NativeFormatImporter:
+  externalObjects: {}
   mainObjectFileID: 2100000
   userData: '{"GUIDArray":["e6f68673cc8e7c347a989ffe33cb21b4","f6dfdaa6d241dc94bb8816edbe111721","",""]}'
   assetBundleName: 

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLit.shader

             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassGBuffer.hlsl"
 
             ENDHLSL
             HLSLPROGRAM
 
             #define SHADERPASS SHADERPASS_GBUFFER
-            #define _BYPASS_ALPHA_TEST
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassGBuffer.hlsl"
 
             ENDHLSL
             #include "../../Debug/DebugDisplay.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassGBuffer.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitMetaPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassLightTransport.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitVelocityPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassVelocity.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitDepthPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitDepthPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
 
             ENDHLSL
 
             #include "../../Lighting/Lighting.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassForward.hlsl"
 
             ENDHLSL
 
             #include "../../Lighting/Lighting.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassForward.hlsl"
 
             ENDHLSL

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitTessellation.shader

             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassGBuffer.hlsl"
 
             ENDHLSL
             #pragma domain Domain
 
             #define SHADERPASS SHADERPASS_GBUFFER
-            #define _BYPASS_ALPHA_TEST
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassGBuffer.hlsl"
 
             ENDHLSL
             #include "../../Debug/DebugDisplay.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassGBuffer.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitMetaPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassLightTransport.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitVelocityPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassVelocity.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitDepthPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
 
             ENDHLSL
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "../Lit/ShaderPass/LitDepthPass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
 
             ENDHLSL
 
             #include "../../Lighting/Lighting.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassForward.hlsl"
 
             ENDHLSL
 
             #include "../../Lighting/Lighting.hlsl"
             #include "../Lit/ShaderPass/LitSharePass.hlsl"
-            #include "../Lit/LitData.hlsl"
+            #include "LayeredLitData.hlsl"
             #include "../../ShaderPass/ShaderPassForward.hlsl"
 
             ENDHLSL

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

             HLSLPROGRAM
 
             #define SHADERPASS SHADERPASS_GBUFFER
-            #define _BYPASS_ALPHA_TEST
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "ShaderPass/LitSharePass.hlsl"

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

             #pragma domain Domain
 
             #define SHADERPASS SHADERPASS_GBUFFER
-            #define _BYPASS_ALPHA_TEST
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"
             #include "ShaderPass/LitSharePass.hlsl"

ScriptableRenderPipeline/HDRenderPipeline/Material/MaterialUtilities.hlsl

 #endif
 }
 
+// This function must be use instead of clip instruction. It allow to manage in which case the clip is perform
+void DoAlphaTest(float alpha, float alphaCutoff)
+{
+    // For Deferred:
+    // If we have a prepass, we need to remove the clip from the GBuffer pass (otherwise HiZ does not work on PS4) - SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
+    // For Forward (Lit or Unlit)
+    // Opaque geometry always has a depth pre-pass so we never want to do the clip here. For transparent we perform the clip as usual.
+    // Also no alpha test for light transport
+#if !(SHADERPASS == SHADERPASS_FORWARD && !defined(_SURFACE_TYPE_TRANSPARENT)) && !(SHADERPASS == SHADERPASS_FORWARD_UNLIT && !defined(_SURFACE_TYPE_TRANSPARENT)) && !defined(SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST) && !(SHADERPASS == SHADERPASS_LIGHT_TRANSPORT)
+    clip(alpha - alphaCutoff);
+#endif
+}
+
 float2 CalculateVelocity(float4 positionCS, float4 previousPositionCS)
 {
     // This test on define is required to remove warning of divide by 0 when initializing empty struct

ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/UnlitData.hlsl

+#include "../MaterialUtilities.hlsl"
-
-void DoAlphaTest(float alpha, float alphaCutoff)
-{
-    // Don't do the clip when rendering forward opaque (unlit). Forward opaque always have a prepass (with depth test on)
-#if !(SHADERPASS == SHADERPASS_FORWARD_UNLIT && !defined(_SURFACE_TYPE_TRANSPARENT))
-    clip(alpha - alphaCutoff);
-#endif
-}
 
 void GetSurfaceAndBuiltinData(FragInputs input, float3 V, inout PositionInputs posInput, out SurfaceData surfaceData, out BuiltinData builtinData)
 {

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitData.hlsl

+//-------------------------------------------------------------------------------------
+// Fill SurfaceData/Builtin data function
+//-------------------------------------------------------------------------------------
+
+#include "../Lit/LitData.hlsl"
+
+#define LAYERS_HEIGHTMAP_ENABLE (defined(_HEIGHTMAP0) || defined(_HEIGHTMAP1) || (_LAYER_COUNT > 2 && defined(_HEIGHTMAP2)) || (_LAYER_COUNT > 3 && defined(_HEIGHTMAP3)))
+
+// Number of sampler are limited, we need to share sampler as much as possible with lit material
+// for this we put the constraint that the sampler are the same in a layered material for all textures of the same type
+// then we take the sampler matching the first textures use of this type
+#if defined(_NORMALMAP0)
+    #if defined(_NORMALMAP_TANGENT_SPACE0)
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMap0
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMapOS0
+    #endif
+#elif defined(_NORMALMAP1)
+    #if defined(_NORMALMAP_TANGENT_SPACE1)
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMap1
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMapOS1
+    #endif
+#elif defined(_NORMALMAP2)
+    #if defined(_NORMALMAP_TANGENT_SPACE2)
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMap2
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMapOS2
+    #endif
+#elif defined(_NORMALMAP3)
+    #if defined(_NORMALMAP_TANGENT_SPACE3)
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMap3
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_NormalMapOS3
+    #endif
+#elif defined(_BENTNORMALMAP0)
+    #if defined(_NORMALMAP_TANGENT_SPACE0)
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMap0
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMapOS0
+    #endif
+#elif defined(_BENTNORMALMAP1)
+    #if defined(_NORMALMAP_TANGENT_SPACE1)
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMap1
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMapOS1
+    #endif
+#elif defined(_BENTNORMALMAP2)
+    #if defined(_NORMALMAP_TANGENT_SPACE2)
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMap2
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMapOS2
+    #endif
+#else
+    #if defined(_NORMALMAP_TANGENT_SPACE3)
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMap3
+    #else
+    #define SAMPLER_NORMALMAP_IDX sampler_BentNormalMapOS3
+    #endif
+#endif
+
+#if defined(_DETAIL_MAP0)
+#define SAMPLER_DETAILMAP_IDX sampler_DetailMap0
+#elif defined(_DETAIL_MAP1)
+#define SAMPLER_DETAILMAP_IDX sampler_DetailMap1
+#elif defined(_DETAIL_MAP2)
+#define SAMPLER_DETAILMAP_IDX sampler_DetailMap2
+#else
+#define SAMPLER_DETAILMAP_IDX sampler_DetailMap3
+#endif
+
+#if defined(_MASKMAP0)
+#define SAMPLER_MASKMAP_IDX sampler_MaskMap0
+#elif defined(_MASKMAP1)
+#define SAMPLER_MASKMAP_IDX sampler_MaskMap1
+#elif defined(_MASKMAP2)
+#define SAMPLER_MASKMAP_IDX sampler_MaskMap2
+#else
+#define SAMPLER_MASKMAP_IDX sampler_MaskMap3
+#endif
+
+#if defined(_HEIGHTMAP0)
+#define SAMPLER_HEIGHTMAP_IDX sampler_HeightMap0
+#elif defined(_HEIGHTMAP1)
+#define SAMPLER_HEIGHTMAP_IDX sampler_HeightMap1
+#elif defined(_HEIGHTMAP2)
+#define SAMPLER_HEIGHTMAP_IDX sampler_HeightMap2
+#elif defined(_HEIGHTMAP3)
+#define SAMPLER_HEIGHTMAP_IDX sampler_HeightMap3
+#endif
+
+#if defined(_SUBSURFACE_RADIUS_MAP0)
+#define _SUBSURFACE_RADIUS_MAP_IDX sampler_SubsurfaceRadiusMap0
+#elif defined(_SUBSURFACE_RADIUS_MAP1)
+#define _SUBSURFACE_RADIUS_MAP_IDX sampler_SubsurfaceRadiusMap1
+#elif defined(_SUBSURFACE_RADIUS_MAP2)
+#define _SUBSURFACE_RADIUS_MAP_IDX sampler_SubsurfaceRadiusMap2
+#elif defined(_SUBSURFACE_RADIUS_MAP3)
+#define _SUBSURFACE_RADIUS_MAP_IDX sampler_SubsurfaceRadiusMap3
+#endif
+
+#if defined(_THICKNESSMAP0)
+#define SAMPLER_THICKNESSMAP_IDX sampler_ThicknessMap0
+#elif defined(_THICKNESSMAP1)
+#define SAMPLER_THICKNESSMAP_IDX sampler_ThicknessMap1
+#elif defined(_THICKNESSMAP2)
+#define SAMPLER_THICKNESSMAP_IDX sampler_ThicknessMap2
+#elif defined(_THICKNESSMAP3)
+#define SAMPLER_THICKNESSMAP_IDX sampler_ThicknessMap3
+#endif
+
+// Define a helper macro
+
+#define ADD_ZERO_IDX(Name) Name##0
+
+// include LitDataInternal multiple time to define the variation of GetSurfaceData for each layer
+#define LAYER_INDEX 0
+#define ADD_IDX(Name) Name##0
+#ifdef _NORMALMAP0
+#define _NORMALMAP_IDX
+#endif
+#ifdef _NORMALMAP_TANGENT_SPACE0
+#define _NORMALMAP_TANGENT_SPACE_IDX
+#endif
+#ifdef _DETAIL_MAP0
+#define _DETAIL_MAP_IDX
+#endif
+#ifdef _SUBSURFACE_RADIUS_MAP0
+#define _SUBSURFACE_RADIUS_MAP_IDX
+#endif
+#ifdef _THICKNESSMAP0
+#define _THICKNESSMAP_IDX
+#endif
+#ifdef _MASKMAP0
+#define _MASKMAP_IDX
+#endif
+#ifdef _BENTNORMALMAP0
+#define _BENTNORMALMAP_IDX
+#endif
+#include "../Lit/LitDataIndividualLayer.hlsl"
+#undef LAYER_INDEX
+#undef ADD_IDX
+#undef _NORMALMAP_IDX
+#undef _NORMALMAP_TANGENT_SPACE_IDX
+#undef _DETAIL_MAP_IDX
+#undef _SUBSURFACE_RADIUS_MAP_IDX
+#undef _THICKNESSMAP_IDX
+#undef _MASKMAP_IDX
+#undef _BENTNORMALMAP_IDX
+
+#define LAYER_INDEX 1
+#define ADD_IDX(Name) Name##1
+#ifdef _NORMALMAP1
+#define _NORMALMAP_IDX
+#endif
+#ifdef _NORMALMAP_TANGENT_SPACE1
+#define _NORMALMAP_TANGENT_SPACE_IDX
+#endif
+#ifdef _DETAIL_MAP1
+#define _DETAIL_MAP_IDX
+#endif
+#ifdef _SUBSURFACE_RADIUS_MAP1
+#define _SUBSURFACE_RADIUS_MAP_IDX
+#endif
+#ifdef _THICKNESSMAP1
+#define _THICKNESSMAP_IDX
+#endif
+#ifdef _MASKMAP1
+#define _MASKMAP_IDX
+#endif
+#ifdef _BENTNORMALMAP1
+#define _BENTNORMALMAP_IDX
+#endif
+#include "../Lit/LitDataIndividualLayer.hlsl"
+#undef LAYER_INDEX
+#undef ADD_IDX
+#undef _NORMALMAP_IDX
+#undef _NORMALMAP_TANGENT_SPACE_IDX
+#undef _DETAIL_MAP_IDX
+#undef _SUBSURFACE_RADIUS_MAP_IDX
+#undef _THICKNESSMAP_IDX
+#undef _MASKMAP_IDX
+#undef _BENTNORMALMAP_IDX
+
+#define LAYER_INDEX 2
+#define ADD_IDX(Name) Name##2
+#ifdef _NORMALMAP2
+#define _NORMALMAP_IDX
+#endif
+#ifdef _NORMALMAP_TANGENT_SPACE2
+#define _NORMALMAP_TANGENT_SPACE_IDX
+#endif
+#ifdef _DETAIL_MAP2
+#define _DETAIL_MAP_IDX
+#endif
+#ifdef _SUBSURFACE_RADIUS_MAP2
+#define _SUBSURFACE_RADIUS_MAP_IDX
+#endif
+#ifdef _THICKNESSMAP2
+#define _THICKNESSMAP_IDX
+#endif
+#ifdef _MASKMAP2
+#define _MASKMAP_IDX
+#endif
+#ifdef _BENTNORMALMAP2
+#define _BENTNORMALMAP_IDX
+#endif
+#include "../Lit/LitDataIndividualLayer.hlsl"
+#undef LAYER_INDEX
+#undef ADD_IDX
+#undef _NORMALMAP_IDX
+#undef _NORMALMAP_TANGENT_SPACE_IDX
+#undef _DETAIL_MAP_IDX
+#undef _SUBSURFACE_RADIUS_MAP_IDX
+#undef _THICKNESSMAP_IDX
+#undef _MASKMAP_IDX
+#undef _BENTNORMALMAP_IDX
+
+#define LAYER_INDEX 3
+#define ADD_IDX(Name) Name##3
+#ifdef _NORMALMAP3
+#define _NORMALMAP_IDX
+#endif
+#ifdef _NORMALMAP_TANGENT_SPACE3
+#define _NORMALMAP_TANGENT_SPACE_IDX
+#endif
+#ifdef _DETAIL_MAP3
+#define _DETAIL_MAP_IDX
+#endif
+#ifdef _SUBSURFACE_RADIUS_MAP3
+#define _SUBSURFACE_RADIUS_MAP_IDX
+#endif
+#ifdef _THICKNESSMAP3
+#define _THICKNESSMAP_IDX
+#endif
+#ifdef _MASKMAP3
+#define _MASKMAP_IDX
+#endif
+#ifdef _BENTNORMALMAP3
+#define _BENTNORMALMAP_IDX
+#endif
+#include "../Lit/LitDataIndividualLayer.hlsl"
+#undef LAYER_INDEX
+#undef ADD_IDX
+#undef _NORMALMAP_IDX
+#undef _NORMALMAP_TANGENT_SPACE_IDX
+#undef _DETAIL_MAP_IDX
+#undef _SUBSURFACE_RADIUS_MAP_IDX
+#undef _THICKNESSMAP_IDX
+#undef _MASKMAP_IDX
+#undef _BENTNORMALMAP_IDX
+
+float3 BlendLayeredVector3(float3 x0, float3 x1, float3 x2, float3 x3, float weight[4])
+{
+    float3 result = float3(0.0, 0.0, 0.0);
+
+    result = x0 * weight[0] + x1 * weight[1];
+#if _LAYER_COUNT >= 3
+    result += (x2 * weight[2]);
+#endif
+#if _LAYER_COUNT >= 4
+    result += x3 * weight[3];
+#endif
+
+    return result;
+}
+
+float BlendLayeredScalar(float x0, float x1, float x2, float x3, float weight[4])
+{
+    float result = 0.0;
+
+    result = x0 * weight[0] + x1 * weight[1];
+#if _LAYER_COUNT >= 3
+    result += x2 * weight[2];
+#endif
+#if _LAYER_COUNT >= 4
+    result += x3 * weight[3];
+#endif
+
+    return result;
+}
+
+// In the case of subsurface profile index, the goal is to take the index with the hights weights.
+// Or the last found in case of equality.
+float BlendLayeredSSSprofile(float x0, float x1, float x2, float x3, float weight[4])
+{
+    int sssProfileIndex = x0;
+    float currentMax = weight[0];
+
+    sssProfileIndex = currentMax < weight[1] ? x1 : sssProfileIndex;
+    currentMax = max(currentMax, weight[1]);
+
+#if _LAYER_COUNT >= 3
+    sssProfileIndex = currentMax < weight[2] ? x2 : sssProfileIndex;
+    currentMax = max(currentMax, weight[2]);
+#endif
+#if _LAYER_COUNT >= 4
+    sssProfileIndex = currentMax < weight[3] ? x3 : sssProfileIndex;
+#endif
+
+    return sssProfileIndex;
+}
+
+#define SURFACEDATA_BLEND_VECTOR3(surfaceData, name, mask) BlendLayeredVector3(MERGE_NAME(surfaceData, 0) MERGE_NAME(., name), MERGE_NAME(surfaceData, 1) MERGE_NAME(., name), MERGE_NAME(surfaceData, 2) MERGE_NAME(., name), MERGE_NAME(surfaceData, 3) MERGE_NAME(., name), mask);
+#define SURFACEDATA_BLEND_SCALAR(surfaceData, name, mask) BlendLayeredScalar(MERGE_NAME(surfaceData, 0) MERGE_NAME(., name), MERGE_NAME(surfaceData, 1) MERGE_NAME(., name), MERGE_NAME(surfaceData, 2) MERGE_NAME(., name), MERGE_NAME(surfaceData, 3) MERGE_NAME(., name), mask);
+#define SURFACEDATA_BLEND_SSS_PROFILE(surfaceData, name, mask) BlendLayeredSSSprofile(MERGE_NAME(surfaceData, 0) MERGE_NAME(., name), MERGE_NAME(surfaceData, 1) MERGE_NAME(., name), MERGE_NAME(surfaceData, 2) MERGE_NAME(., name), MERGE_NAME(surfaceData, 3) MERGE_NAME(., name), mask);
+#define PROP_BLEND_SCALAR(name, mask) BlendLayeredScalar(name##0, name##1, name##2, name##3, mask);
+
+void GetLayerTexCoord(float2 texCoord0, float2 texCoord1, float2 texCoord2, float2 texCoord3,
+                      float3 positionWS, float3 vertexNormalWS, inout LayerTexCoord layerTexCoord)
+{
+    layerTexCoord.vertexNormalWS = vertexNormalWS;
+    layerTexCoord.triplanarWeights = ComputeTriplanarWeights(vertexNormalWS);
+
+    int mappingType = UV_MAPPING_UVSET;
+#if defined(_LAYER_MAPPING_PLANAR_BLENDMASK)
+    mappingType = UV_MAPPING_PLANAR;
+#elif defined(_LAYER_MAPPING_TRIPLANAR_BLENDMASK)
+    mappingType = UV_MAPPING_TRIPLANAR;
+#endif
+
+    // Note: Blend mask have its dedicated mapping and tiling.
+    // To share code, we simply call the regular code from the main layer for it then save the result, then do regular call for all layers.
+    ComputeLayerTexCoord0(  texCoord0, texCoord1, texCoord2, texCoord3, _UVMappingMaskBlendMask, _UVMappingMaskBlendMask,
+                            _LayerMaskMap_ST.xy, _LayerMaskMap_ST.zw, float2(0.0, 0.0), float2(0.0, 0.0), 1.0, false,
+                            positionWS, _TexWorldScaleBlendMask,
+                            mappingType, layerTexCoord);
+
+    layerTexCoord.blendMask = layerTexCoord.base0;
+
+    // On all layers (but not on blend mask) we can scale the tiling with object scale (only uniform supported)
+    // Note: the object scale doesn't affect planar/triplanar mapping as they already handle the object scale.
+    float tileObjectScale = 1.0;
+#ifdef _LAYER_TILING_COUPLED_WITH_UNIFORM_OBJECT_SCALE
+    // Extract scaling from world transform
+    float4x4 worldTransform = GetObjectToWorldMatrix();
+    // assuming uniform scaling, take only the first column
+    tileObjectScale = length(float3(worldTransform._m00, worldTransform._m01, worldTransform._m02));
+#endif
+
+    mappingType = UV_MAPPING_UVSET;
+#if defined(_LAYER_MAPPING_PLANAR0)
+    mappingType = UV_MAPPING_PLANAR;
+#elif defined(_LAYER_MAPPING_TRIPLANAR0)
+    mappingType = UV_MAPPING_TRIPLANAR;
+#endif
+
+    ComputeLayerTexCoord0(  texCoord0, texCoord1, texCoord2, texCoord3, _UVMappingMask0, _UVDetailsMappingMask0,
+                            _BaseColorMap0_ST.xy, _BaseColorMap0_ST.zw, _DetailMap0_ST.xy, _DetailMap0_ST.zw, 1.0
+                            #if !defined(_MAIN_LAYER_INFLUENCE_MODE)
+                            * tileObjectScale  // We only affect layer0 in case we are not in influence mode (i.e we should not change the base object)
+                            #endif
+                            , _LinkDetailsWithBase0
+                            , positionWS, _TexWorldScale0,
+                            mappingType, layerTexCoord);
+
+    mappingType = UV_MAPPING_UVSET;
+#if defined(_LAYER_MAPPING_PLANAR1)
+    mappingType = UV_MAPPING_PLANAR;
+#elif defined(_LAYER_MAPPING_TRIPLANAR1)
+    mappingType = UV_MAPPING_TRIPLANAR;
+#endif
+    ComputeLayerTexCoord1(  texCoord0, texCoord1, texCoord2, texCoord3, _UVMappingMask1, _UVDetailsMappingMask1,
+                            _BaseColorMap1_ST.xy, _BaseColorMap1_ST.zw, _DetailMap1_ST.xy, _DetailMap1_ST.zw, tileObjectScale, _LinkDetailsWithBase1,
+                            positionWS, _TexWorldScale1,
+                            mappingType, layerTexCoord);
+
+    mappingType = UV_MAPPING_UVSET;
+#if defined(_LAYER_MAPPING_PLANAR2)
+    mappingType = UV_MAPPING_PLANAR;
+#elif defined(_LAYER_MAPPING_TRIPLANAR2)
+    mappingType = UV_MAPPING_TRIPLANAR;
+#endif
+    ComputeLayerTexCoord2(  texCoord0, texCoord1, texCoord2, texCoord3, _UVMappingMask2, _UVDetailsMappingMask2,
+                            _BaseColorMap2_ST.xy, _BaseColorMap2_ST.zw, _DetailMap2_ST.xy, _DetailMap2_ST.zw, tileObjectScale, _LinkDetailsWithBase2,
+                            positionWS, _TexWorldScale2,
+                            mappingType, layerTexCoord);
+
+    mappingType = UV_MAPPING_UVSET;
+#if defined(_LAYER_MAPPING_PLANAR3)
+    mappingType = UV_MAPPING_PLANAR;
+#elif defined(_LAYER_MAPPING_TRIPLANAR3)
+    mappingType = UV_MAPPING_TRIPLANAR;
+#endif
+    ComputeLayerTexCoord3(  texCoord0, texCoord1, texCoord2, texCoord3, _UVMappingMask3, _UVDetailsMappingMask3,
+                            _BaseColorMap3_ST.xy, _BaseColorMap3_ST.zw, _DetailMap3_ST.xy, _DetailMap3_ST.zw, tileObjectScale, _LinkDetailsWithBase3,
+                            positionWS, _TexWorldScale3,
+                            mappingType, layerTexCoord);
+}
+
+// This is call only in this file
+// layerTexCoord must have been initialize to 0 outside of this function
+void GetLayerTexCoord(FragInputs input, inout LayerTexCoord layerTexCoord)
+{
+#ifdef SURFACE_GRADIENT
+    GenerateLayerTexCoordBasisTB(input, layerTexCoord);
+#endif
+
+    GetLayerTexCoord(   input.texCoord0, input.texCoord1, input.texCoord2, input.texCoord3,
+                        input.positionWS, input.worldToTangent[2].xyz, layerTexCoord);
+}
+
+void ApplyDisplacementTileScale(inout float height0, inout float height1, inout float height2, inout float height3)
+{
+    // When we change the tiling, we have want to conserve the ratio with the displacement (and this is consistent with per pixel displacement)
+#ifdef _DISPLACEMENT_LOCK_TILING_SCALE
+    float tileObjectScale = 1.0;
+    #ifdef _LAYER_TILING_COUPLED_WITH_UNIFORM_OBJECT_SCALE
+    // Extract scaling from world transform
+    float4x4 worldTransform = GetObjectToWorldMatrix();
+    // assuming uniform scaling, take only the first column
+    tileObjectScale = length(float3(worldTransform._m00, worldTransform._m01, worldTransform._m02));
+    #endif
+
+    // TODO: precompute all these scaling factors!
+    height0 *= _InvTilingScale0;
+    #if !defined(_MAIN_LAYER_INFLUENCE_MODE)
+    height0 /= tileObjectScale;  // We only affect layer0 in case we are not in influence mode (i.e we should not change the base object)
+    #endif
+    height1 = (height1 / tileObjectScale) * _InvTilingScale1;
+    height2 = (height2 / tileObjectScale) * _InvTilingScale2;
+    height3 = (height3 / tileObjectScale) * _InvTilingScale3;
+#endif
+}
+
+// This function is just syntaxic sugar to nullify height not used based on heightmap avaibility and layer
+void SetEnabledHeightByLayer(inout float height0, inout float height1, inout float height2, inout float height3)
+{
+#ifndef _HEIGHTMAP0
+    height0 = 0.0;
+#endif
+#ifndef _HEIGHTMAP1
+    height1 = 0.0;
+#endif
+#ifndef _HEIGHTMAP2
+    height2 = 0.0;
+#endif
+#ifndef _HEIGHTMAP3
+    height3 = 0.0;
+#endif
+
+#if _LAYER_COUNT < 4
+    height3 = 0.0;
+#endif
+#if _LAYER_COUNT < 3
+    height2 = 0.0;
+#endif
+}
+
+void ComputeMaskWeights(float4 inputMasks, out float outWeights[_MAX_LAYER])
+{
+    float masks[_MAX_LAYER];
+    masks[0] = inputMasks.a;
+
+    masks[1] = inputMasks.r;
+#if _LAYER_COUNT > 2
+    masks[2] = inputMasks.g;
+#else
+    masks[2] = 0.0;
+#endif
+#if _LAYER_COUNT > 3
+    masks[3] = inputMasks.b;
+#else
+    masks[3] = 0.0;
+#endif
+
+    // calculate weight of each layers
+    // Algorithm is like this:
+    // Top layer have priority on others layers
+    // If a top layer doesn't use the full weight, the remaining can be use by the following layer.
+    float weightsSum = 0.0;
+
+    [unroll]
+    for (int i = _LAYER_COUNT - 1; i >= 0; --i)
+    {
+        outWeights[i] = min(masks[i], (1.0 - weightsSum));
+        weightsSum = saturate(weightsSum + masks[i]);
+    }
+}
+
+// Caution: Blend mask are Layer 1 R - Layer 2 G - Layer 3 B - Main Layer A
+float4 GetBlendMask(LayerTexCoord layerTexCoord, float4 vertexColor, bool useLodSampling = false, float lod = 0)
+{
+    // Caution:
+    // Blend mask are Main Layer A - Layer 1 R - Layer 2 G - Layer 3 B
+    // Value for main layer is not use for blending itself but for alternate weighting like density.
+    // Settings this specific Main layer blend mask in alpha allow to be transparent in case we don't use it and 1 is provide by default.
+    float4 blendMasks = useLodSampling ? SAMPLE_UVMAPPING_TEXTURE2D_LOD(_LayerMaskMap, sampler_LayerMaskMap, layerTexCoord.blendMask, lod) : SAMPLE_UVMAPPING_TEXTURE2D(_LayerMaskMap, sampler_LayerMaskMap, layerTexCoord.blendMask);
+
+    // Wind uses vertex alpha as an intensity parameter.
+    // So in case Layered shader uses wind, we need to hardcode the alpha here so that the main layer can be visible without affecting wind intensity.
+    // It also means that when using wind, users can't use vertex color to modulate the effect of influence from the main layer.
+    float4 maskVertexColor = vertexColor;
+#if defined(_LAYER_MASK_VERTEX_COLOR_MUL)
+    #if defined(_VERTEX_WIND)
+    // For multiplicative vertex color blend mask. 1.0f is the neutral value
+    maskVertexColor.a = 1.0f;
+    #endif
+    blendMasks *= maskVertexColor;
+#elif defined(_LAYER_MASK_VERTEX_COLOR_ADD)
+    #if defined(_VERTEX_WIND)
+    // For additive vertex color blend mask. 0.5f is the neutral value (0.5 * 2.0 - 1.0 = 0.0)
+    maskVertexColor.a = 0.5f;
+    #endif
+    blendMasks = saturate(blendMasks + maskVertexColor * 2.0 - 1.0);
+#endif
+
+    return blendMasks;
+}
+
+float GetInfluenceMask(LayerTexCoord layerTexCoord, bool useLodSampling = false, float lod = 0)
+{
+    // Sample influence mask with same mapping as Main layer
+    return useLodSampling ? SAMPLE_UVMAPPING_TEXTURE2D_LOD(_LayerInfluenceMaskMap, sampler_LayerInfluenceMaskMap, layerTexCoord.base0, lod).r : SAMPLE_UVMAPPING_TEXTURE2D(_LayerInfluenceMaskMap, sampler_LayerInfluenceMaskMap, layerTexCoord.base0).r;
+}
+
+float GetMaxHeight(float4 heights)
+{
+    float maxHeight = max(heights.r, heights.g);
+#ifdef _LAYEREDLIT_4_LAYERS
+    maxHeight = max(Max3(heights.r, heights.g, heights.b), heights.a);
+#endif
+#ifdef _LAYEREDLIT_3_LAYERS
+    maxHeight = Max3(heights.r, heights.g, heights.b);
+#endif
+
+    return maxHeight;
+}
+
+// Returns layering blend mask after application of height based blend.
+float4 ApplyHeightBlend(float4 heights, float4 blendMask)
+{
+    // Add offsets for all the layers.
+    heights = heights + float4(_HeightOffset0, _HeightOffset1, _HeightOffset2, _HeightOffset3);
+
+    // We need to mask out inactive layers so that their height does not impact the result.
+    float4 maskedHeights = heights * blendMask.argb;
+
+    float maxHeight = GetMaxHeight(maskedHeights);
+    // Make sure that transition is not zero otherwise the next computation will be wrong.
+    // The epsilon here also has to be bigger than the epsilon in the next computation.
+    float transition = max(_HeightTransition, 1e-5);
+
+    // The goal here is to have all but the highest layer at negative heights, then we add the transition so that if the next highest layer is near transition it will have a positive value.
+    // Then we clamp this to zero and normalize everything so that highest layer has a value of 1.
+    maskedHeights = maskedHeights - maxHeight.xxxx;
+    // We need to add an epsilon here for active layers (hence the blendMask again) so that at least a layer shows up if everything's too low.
+    maskedHeights = (max(0, maskedHeights + transition) + 1e-6) * blendMask.argb;
+
+    // Normalize
+    maxHeight = GetMaxHeight(maskedHeights);
+    maskedHeights = maskedHeights / maxHeight.xxxx;
+
+    return maskedHeights.yzwx;
+}
+
+// Calculate weights to apply to each layer
+// Caution: This function must not be use for per vertex/pixel displacement, there is a dedicated function for them.
+// This function handle triplanar
+void ComputeLayerWeights(FragInputs input, LayerTexCoord layerTexCoord, float4 inputAlphaMask, float4 blendMasks, out float outWeights[_MAX_LAYER])
+{
+    for (int i = 0; i < _MAX_LAYER; ++i)
+    {
+        outWeights[i] = 0.0f;
+    }
+
+#if defined(_DENSITY_MODE)
+    // Note: blendMasks.argb because a is main layer
+    float4 opacityAsDensity = saturate((inputAlphaMask - (float4(1.0, 1.0, 1.0, 1.0) - blendMasks.argb)) * 20.0); // 20.0 is the number of steps in inputAlphaMask (Density mask. We decided 20 empirically)
+    float4 useOpacityAsDensityParam = float4(_OpacityAsDensity0, _OpacityAsDensity1, _OpacityAsDensity2, _OpacityAsDensity3);
+    blendMasks.argb = lerp(blendMasks.argb, opacityAsDensity, useOpacityAsDensityParam);
+#endif
+
+#if LAYERS_HEIGHTMAP_ENABLE
+    float height0 = (SAMPLE_UVMAPPING_TEXTURE2D(_HeightMap0, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base0).r - _HeightCenter0) * _HeightAmplitude0;
+    float height1 = (SAMPLE_UVMAPPING_TEXTURE2D(_HeightMap1, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base1).r - _HeightCenter1) * _HeightAmplitude1;
+    float height2 = (SAMPLE_UVMAPPING_TEXTURE2D(_HeightMap2, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base2).r - _HeightCenter2) * _HeightAmplitude2;
+    float height3 = (SAMPLE_UVMAPPING_TEXTURE2D(_HeightMap3, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base3).r - _HeightCenter3) * _HeightAmplitude3;
+    // Height is affected by tiling property and by object scale (depends on option).
+    // Apply scaling from tiling properties (TexWorldScale and tiling from BaseColor)
+    ApplyDisplacementTileScale(height0, height1, height2, height3);
+    // Nullify height that are not used, so compiler can remove unused case
+    SetEnabledHeightByLayer(height0, height1, height2, height3);
+
+    // Reminder: _MAIN_LAYER_INFLUENCE_MODE is a purely visual mode, it is not take into account for the blendMasks
+    // As it is purely visual, it is not apply in ComputeLayerWeights
+
+    #if defined(_HEIGHT_BASED_BLEND)
+    // Modify blendMask to take into account the height of the layer. Higher height should be more visible.
+    blendMasks = ApplyHeightBlend(float4(height0, height1, height2, height3), blendMasks);
+    #endif
+#endif
+
+    ComputeMaskWeights(blendMasks, outWeights);
+}
+
+float3 ComputeMainNormalInfluence(float influenceMask, FragInputs input, float3 normalTS0, float3 normalTS1, float3 normalTS2, float3 normalTS3, LayerTexCoord layerTexCoord, float inputMainLayerMask, float weights[_MAX_LAYER])
+{
+    // Get our regular normal from regular layering
+    float3 normalTS = BlendLayeredVector3(normalTS0, normalTS1, normalTS2, normalTS3, weights);
+
+    // THen get Main Layer Normal influence factor. Main layer is 0 because it can't be influence. In this case the final lerp return normalTS.
+    float influenceFactor = BlendLayeredScalar(0.0, _InheritBaseNormal1, _InheritBaseNormal2, _InheritBaseNormal3, weights) * influenceMask;
+    // We will add smoothly the contribution of the normal map by lerping between vertex normal ( (0,0,1) in tangent space) and the actual normal from the main layer depending on the influence factor.
+    // Note: that we don't take details map into account here.
+    #ifdef SURFACE_GRADIENT
+    float3 neutralNormalTS = float3(0.0, 0.0, 0.0);
+    #else
+    float3 neutralNormalTS = float3(0.0, 0.0, 1.0);
+    #endif
+    float3 mainNormalTS = lerp(neutralNormalTS, normalTS0, influenceFactor);
+
+    // Add on our regular normal a bit of Main Layer normal base on influence factor. Note that this affect only the "visible" normal.
+    #ifdef SURFACE_GRADIENT
+    return normalTS + influenceFactor * mainNormalTS * inputMainLayerMask;
+    #else
+    return lerp(normalTS, BlendNormalRNM(normalTS, mainNormalTS), influenceFactor * inputMainLayerMask); // Multiply by inputMainLayerMask in order to avoid influence where main layer should never be present
+    #endif
+}
+
+float3 ComputeMainBaseColorInfluence(float influenceMask, float3 baseColor0, float3 baseColor1, float3 baseColor2, float3 baseColor3, LayerTexCoord layerTexCoord, float inputMainLayerMask, float weights[_MAX_LAYER])
+{
+    float3 baseColor = BlendLayeredVector3(baseColor0, baseColor1, baseColor2, baseColor3, weights);
+
+    float influenceFactor = BlendLayeredScalar(0.0, _InheritBaseColor1, _InheritBaseColor2, _InheritBaseColor3, weights) * influenceMask * inputMainLayerMask; // Multiply by inputMainLayerMask in order to avoid influence where main layer should never be present
+
+    // We want to calculate the mean color of the texture. For this we will sample a low mipmap
+    float textureBias = 15.0; // Use maximum bias
+    float3 baseMeanColor0 = SAMPLE_UVMAPPING_TEXTURE2D_BIAS(_BaseColorMap0, sampler_BaseColorMap0, layerTexCoord.base0, textureBias).rgb *_BaseColor0.rgb;
+    float3 baseMeanColor1 = SAMPLE_UVMAPPING_TEXTURE2D_BIAS(_BaseColorMap1, sampler_BaseColorMap0, layerTexCoord.base1, textureBias).rgb *_BaseColor1.rgb;
+    float3 baseMeanColor2 = SAMPLE_UVMAPPING_TEXTURE2D_BIAS(_BaseColorMap2, sampler_BaseColorMap0, layerTexCoord.base2, textureBias).rgb *_BaseColor2.rgb;
+    float3 baseMeanColor3 = SAMPLE_UVMAPPING_TEXTURE2D_BIAS(_BaseColorMap3, sampler_BaseColorMap0, layerTexCoord.base3, textureBias).rgb *_BaseColor3.rgb;
+
+    float3 meanColor = BlendLayeredVector3(baseMeanColor0, baseMeanColor1, baseMeanColor2, baseMeanColor3, weights);
+
+    // If we inherit from base layer, we will add a bit of it
+    // We add variance of current visible level and the base color 0 or mean (to retrieve initial color) depends on influence
+    // (baseColor - meanColor) + lerp(meanColor, baseColor0, inheritBaseColor) simplify to
+    // saturate(influenceFactor * (baseColor0 - meanColor) + baseColor);
+    // There is a special case when baseColor < meanColor to avoid getting negative values.
+    float3 factor = baseColor > meanColor ? (baseColor0 - meanColor) : (baseColor0 * baseColor / max(meanColor, 0.001) - baseColor); // max(to avoid divide by 0)
+    return influenceFactor * factor + baseColor;
+}
+
+#include "LayeredLitDataDisplacement.hlsl"
+
+void GetSurfaceAndBuiltinData(FragInputs input, float3 V, inout PositionInputs posInput, out SurfaceData surfaceData, out BuiltinData builtinData)
+{
+#ifdef LOD_FADE_CROSSFADE // enable dithering LOD transition if user select CrossFade transition in LOD group
+    LODDitheringTransition(posInput.unPositionSS, unity_LODFade.x);
+#endif
+
+    ApplyDoubleSidedFlipOrMirror(input); // Apply double sided flip on the vertex normal
+
+    LayerTexCoord layerTexCoord;
+    ZERO_INITIALIZE(LayerTexCoord, layerTexCoord);
+    GetLayerTexCoord(input, layerTexCoord);
+
+    float4 blendMasks = GetBlendMask(layerTexCoord, input.color);
+    float depthOffset = ApplyPerPixelDisplacement(input, V, layerTexCoord, blendMasks);
+
+#ifdef _DEPTHOFFSET_ON
+    ApplyDepthOffsetPositionInput(V, depthOffset, GetWorldToHClipMatrix(), posInput);
+#endif
+
+    SurfaceData surfaceData0, surfaceData1, surfaceData2, surfaceData3;
+    float3 normalTS0, normalTS1, normalTS2, normalTS3;
+    float3 bentNormalTS0, bentNormalTS1, bentNormalTS2, bentNormalTS3;
+    float alpha0 = GetSurfaceData0(input, layerTexCoord, surfaceData0, normalTS0, bentNormalTS0);
+    float alpha1 = GetSurfaceData1(input, layerTexCoord, surfaceData1, normalTS1, bentNormalTS1);
+    float alpha2 = GetSurfaceData2(input, layerTexCoord, surfaceData2, normalTS2, bentNormalTS2);
+    float alpha3 = GetSurfaceData3(input, layerTexCoord, surfaceData3, normalTS3, bentNormalTS3);
+
+    // Note: If per pixel displacement is enabled it mean we will fetch again the various heightmaps at the intersection location. Not sure the compiler can optimize.
+    float weights[_MAX_LAYER];
+    ComputeLayerWeights(input, layerTexCoord, float4(alpha0, alpha1, alpha2, alpha3), blendMasks, weights);
+
+    // For layered shader, alpha of base color is used as either an opacity mask, a composition mask for inheritance parameters or a density mask.
+    float alpha = PROP_BLEND_SCALAR(alpha, weights);
+
+#ifdef _ALPHATEST_ON
+    DoAlphaTest(alpha, _AlphaCutoff);
+#endif
+
+    float3 normalTS;
+    float3 bentNormalTS;
+    float3 bentNormalWS;
+#if defined(_MAIN_LAYER_INFLUENCE_MODE)
+
+    #ifdef _INFLUENCEMASK_MAP
+    float influenceMask = GetInfluenceMask(layerTexCoord);
+    #else
+    float influenceMask = 1.0;
+    #endif
+
+    if (influenceMask > 0.0f)
+    {
+        surfaceData.baseColor = ComputeMainBaseColorInfluence(influenceMask, surfaceData0.baseColor, surfaceData1.baseColor, surfaceData2.baseColor, surfaceData3.baseColor, layerTexCoord, blendMasks.a, weights);
+        normalTS = ComputeMainNormalInfluence(influenceMask, input, normalTS0, normalTS1, normalTS2, normalTS3, layerTexCoord, blendMasks.a, weights);
+        bentNormalTS = ComputeMainNormalInfluence(influenceMask, input, bentNormalTS0, bentNormalTS1, bentNormalTS2, bentNormalTS3, layerTexCoord, blendMasks.a, weights);
+    }
+    else
+#endif
+    {
+        surfaceData.baseColor = SURFACEDATA_BLEND_VECTOR3(surfaceData, baseColor, weights);
+        normalTS = BlendLayeredVector3(normalTS0, normalTS1, normalTS2, normalTS3, weights);
+        bentNormalTS = BlendLayeredVector3(bentNormalTS0, bentNormalTS1, bentNormalTS2, bentNormalTS3, weights);
+    }
+
+    surfaceData.perceptualSmoothness = SURFACEDATA_BLEND_SCALAR(surfaceData, perceptualSmoothness, weights);
+    surfaceData.ambientOcclusion = SURFACEDATA_BLEND_SCALAR(surfaceData, ambientOcclusion, weights);
+    surfaceData.metallic = SURFACEDATA_BLEND_SCALAR(surfaceData, metallic, weights);
+    surfaceData.tangentWS = normalize(input.worldToTangent[0].xyz); // The tangent is not normalize in worldToTangent for mikkt. Tag: SURFACE_GRADIENT
+    surfaceData.subsurfaceRadius = SURFACEDATA_BLEND_SCALAR(surfaceData, subsurfaceRadius, weights);
+    surfaceData.thickness = SURFACEDATA_BLEND_SCALAR(surfaceData, thickness, weights);
+    surfaceData.subsurfaceProfile = SURFACEDATA_BLEND_SSS_PROFILE(surfaceData, subsurfaceProfile, weights);
+
+    // Layered shader support either SSS or standard (can't mix them)
+#ifdef _MATID_SSS
+    surfaceData.materialId = MATERIALID_LIT_SSS;
+#else // Default
+    surfaceData.materialId = MATERIALID_LIT_STANDARD;
+#endif
+
+    // Init other parameters
+    surfaceData.anisotropy = 0;
+    surfaceData.specularColor = float3(0.0, 0.0, 0.0);
+    surfaceData.coatNormalWS = float3(0.0, 0.0, 0.0);
+    surfaceData.coatCoverage = 0.0f;
+    surfaceData.coatIOR = 0.5;
+
+    // Transparency parameters
+    // Use thickness from SSS
+    surfaceData.ior = 1.0;
+    surfaceData.transmittanceColor = float3(1.0, 1.0, 1.0);
+    surfaceData.atDistance = 1000000.0;
+    surfaceData.transmittanceMask = 0.0;
+
+    GetNormalWS(input, V, normalTS, surfaceData.normalWS);
+    // Use bent normal to sample GI if available
+    // If any layer use a bent normal map, then bentNormalTS contain the interpolated result of bentnormal and normalmap (in case no bent normal are available)
+    // Note: the code in LitDataInternal ensure that we fallback on normal map for layer that have no bentnormal
+#if defined(_BENTNORMALMAP0) || defined(_BENTNORMALMAP1) || defined(_BENTNORMALMAP2) || defined(_BENTNORMALMAP3)
+    GetNormalWS(input, V, bentNormalTS, bentNormalWS);
+#else // if no bent normal are available at all just keep the calculation fully
+    bentNormalWS = surfaceData.normalWS;
+#endif
+
+    // By default we use the ambient occlusion with Tri-ace trick (apply outside) for specular occlusion.
+    // If user provide bent normal then we process a better term
+#if (defined(_BENTNORMALMAP0) || defined(_BENTNORMALMAP1) || defined(_BENTNORMALMAP2) || defined(_BENTNORMALMAP3)) && defined(_ENABLESPECULAROCCLUSION)
+    // If we have bent normal and ambient occlusion, process a specular occlusion
+    surfaceData.specularOcclusion = GetSpecularOcclusionFromBentAO(V, bentNormalWS, surfaceData);
+#elif defined(_MASKMAP0) || defined(_MASKMAP1) || defined(_MASKMAP2) || defined(_MASKMAP3)
+    surfaceData.specularOcclusion = GetSpecularOcclusionFromAmbientOcclusion(dot(surfaceData.normalWS, V), surfaceData.ambientOcclusion, PerceptualSmoothnessToRoughness(surfaceData.perceptualSmoothness));
+#else
+    surfaceData.specularOcclusion = 1.0;
+#endif
+
+    GetBuiltinData(input, surfaceData, alpha, bentNormalWS, depthOffset, builtinData);
+}
+
+#include "../Lit/LitDataMeshModification.hlsl"

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitData.hlsl.meta

+fileFormatVersion: 2
+guid: ff68514b73492dd4bbf3e466f3cfcd99
+timeCreated: 1508932230
+licenseType: Pro
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitDataDisplacement.hlsl

+#include "../Lit/LitDataDisplacement.hlsl"
+
+// Return the maximum amplitude use by all enabled heightmap
+// use for tessellation culling and per pixel displacement
+// TODO: For vertex displacement this should take into account the modification in ApplyTessellationTileScale but it should be conservative here (as long as tiling is not negative)
+float GetMaxDisplacement()
+{
+    float maxDisplacement = 0.0;
+
+    // _HeightAmplitudeX can be negative if min and max are inverted, but the max displacement must be positive, take abs()
+#if defined(_HEIGHTMAP0)
+    maxDisplacement = abs(_HeightAmplitude0);
+#endif
+
+#if defined(_HEIGHTMAP1)
+    maxDisplacement = max(  abs(_HeightAmplitude1)
+                            #if defined(_MAIN_LAYER_INFLUENCE_MODE)
+                            + abs(_HeightAmplitude0) * _InheritBaseHeight1
+                            #endif
+                            , maxDisplacement);
+#endif
+
+#if _LAYER_COUNT >= 3
+#if defined(_HEIGHTMAP2)
+    maxDisplacement = max(  abs(_HeightAmplitude2)
+                            #if defined(_MAIN_LAYER_INFLUENCE_MODE)
+                            + abs(_HeightAmplitude0) * _InheritBaseHeight2
+                            #endif
+                            , maxDisplacement);
+#endif
+#endif
+
+#if _LAYER_COUNT >= 4
+#if defined(_HEIGHTMAP3)
+    maxDisplacement = max(  abs(_HeightAmplitude3)
+                            #if defined(_MAIN_LAYER_INFLUENCE_MODE)
+                            + abs(_HeightAmplitude0) * _InheritBaseHeight3
+                            #endif
+                            , maxDisplacement);
+#endif
+#endif
+
+    return maxDisplacement;
+}
+
+// Return the minimun uv size for all layers including triplanar
+float2 GetMinUvSize(LayerTexCoord layerTexCoord)
+{
+    float2 minUvSize = float2(FLT_MAX, FLT_MAX);
+
+#if defined(_HEIGHTMAP0)
+    if (layerTexCoord.base0.mappingType == UV_MAPPING_TRIPLANAR)
+    {
+        minUvSize = min(layerTexCoord.base0.uvZY * _HeightMap0_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base0.uvXZ * _HeightMap0_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base0.uvXY * _HeightMap0_TexelSize.zw, minUvSize);
+    }
+    else
+    {
+        minUvSize = min(layerTexCoord.base0.uv * _HeightMap0_TexelSize.zw, minUvSize);
+    }
+#endif
+
+#if defined(_HEIGHTMAP1)
+    if (layerTexCoord.base1.mappingType == UV_MAPPING_TRIPLANAR)
+    {
+        minUvSize = min(layerTexCoord.base1.uvZY * _HeightMap1_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base1.uvXZ * _HeightMap1_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base1.uvXY * _HeightMap1_TexelSize.zw, minUvSize);
+    }
+    else
+    {
+        minUvSize = min(layerTexCoord.base1.uv * _HeightMap1_TexelSize.zw, minUvSize);
+    }
+#endif
+
+#if _LAYER_COUNT >= 3
+#if defined(_HEIGHTMAP2)
+    if (layerTexCoord.base2.mappingType == UV_MAPPING_TRIPLANAR)
+    {
+        minUvSize = min(layerTexCoord.base2.uvZY * _HeightMap2_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base2.uvXZ * _HeightMap2_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base2.uvXY * _HeightMap2_TexelSize.zw, minUvSize);
+    }
+    else
+    {
+        minUvSize = min(layerTexCoord.base2.uv * _HeightMap2_TexelSize.zw, minUvSize);
+    }
+#endif
+#endif
+
+#if _LAYER_COUNT >= 4
+#if defined(_HEIGHTMAP3)
+    if (layerTexCoord.base3.mappingType == UV_MAPPING_TRIPLANAR)
+    {
+        minUvSize = min(layerTexCoord.base3.uvZY * _HeightMap3_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base3.uvXZ * _HeightMap3_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base3.uvXY * _HeightMap3_TexelSize.zw, minUvSize);
+    }
+    else
+    {
+        minUvSize = min(layerTexCoord.base3.uv * _HeightMap3_TexelSize.zw, minUvSize);
+    }
+#endif
+#endif
+
+    return minUvSize;
+}
+
+#if defined(_PIXEL_DISPLACEMENT) && LAYERS_HEIGHTMAP_ENABLE
+struct PerPixelHeightDisplacementParam
+{
+    float4 blendMasks;
+    float2 uv[_MAX_LAYER];
+    float2 uvSpaceScale[_MAX_LAYER];
+#if defined(_MAIN_LAYER_INFLUENCE_MODE) && defined(_HEIGHTMAP0)
+    float heightInfluence[_MAX_LAYER];
+#endif
+};
+
+// Calculate displacement for per vertex displacement mapping
+float ComputePerPixelHeightDisplacement(float2 texOffsetCurrent, float lod, PerPixelHeightDisplacementParam param)
+{
+    // See function ComputePerVertexDisplacement() for comment about the weights/influenceMask/BlendMask
+
+    // Note: Amplitude is handled in uvSpaceScale, no need to multiply by it here.
+    float height0 = SAMPLE_TEXTURE2D_LOD(_HeightMap0, SAMPLER_HEIGHTMAP_IDX, param.uv[0] + texOffsetCurrent * param.uvSpaceScale[0], lod).r;
+    float height1 = SAMPLE_TEXTURE2D_LOD(_HeightMap1, SAMPLER_HEIGHTMAP_IDX, param.uv[1] + texOffsetCurrent * param.uvSpaceScale[1], lod).r;
+    float height2 = SAMPLE_TEXTURE2D_LOD(_HeightMap2, SAMPLER_HEIGHTMAP_IDX, param.uv[2] + texOffsetCurrent * param.uvSpaceScale[2], lod).r;
+    float height3 = SAMPLE_TEXTURE2D_LOD(_HeightMap3, SAMPLER_HEIGHTMAP_IDX, param.uv[3] + texOffsetCurrent * param.uvSpaceScale[3], lod).r;
+
+    SetEnabledHeightByLayer(height0, height1, height2, height3);
+
+    float4 blendMasks = param.blendMasks;
+#if defined(_HEIGHT_BASED_BLEND)
+    // Modify blendMask to take into account the height of the layer. Higher height should be more visible.
+    blendMasks = ApplyHeightBlend(float4(height0, height1, height2, height3), param.blendMasks);
+#endif
+
+    float weights[_MAX_LAYER];
+    ComputeMaskWeights(blendMasks, weights);
+
+#if defined(_MAIN_LAYER_INFLUENCE_MODE) && defined(_HEIGHTMAP0)
+    float influenceMask = blendMasks.a;
+    #ifdef _INFLUENCEMASK_MAP
+    influenceMask *= SAMPLE_TEXTURE2D_LOD(_LayerInfluenceMaskMap, sampler_BaseColorMap0, param.uv[0], lod).r;
+    #endif
+    height1 += height0 * _InheritBaseHeight1 * influenceMask;
+    height2 += height0 * _InheritBaseHeight2 * influenceMask;
+    height3 += height0 * _InheritBaseHeight3 * influenceMask;
+#endif
+
+    return BlendLayeredScalar(height0, height1, height2, height3, weights);
+}
+
+#include "../../../Core/ShaderLibrary/PerPixelDisplacement.hlsl"
+
+#endif // defined(_PIXEL_DISPLACEMENT) && LAYERS_HEIGHTMAP_ENABLE
+
+// PPD is affecting only one mapping at the same time, mean we need to execute it for each mapping (UV0, UV1, 3 times for triplanar etc..)
+// We chose to not support all this case that are extremely hard to manage (for example mixing different mapping, mean it also require different tangent space that is not supported in Unity)
+// For these reasons we put the following rules
+// Rules:
+// - Mapping is the same for all layers that use an Heightmap (i.e all are UV, planar or triplanar)
+// - Mapping UV is UV0 only because we need to convert view vector in texture space and this is only available for UV0
+// - Heightmap can be enabled per layer
+// - Blend Mask use same mapping as main layer (UVO, Planar, Triplanar)
+// From these rules it mean that PPD is enable only if the user 1) ask for it, 2) if there is one heightmap enabled on active layer, 3) if mapping is the same for all layer respecting 2), 4) if mapping is UV0, planar or triplanar mapping
+// Most contraint are handled by the inspector (i.e the UI) like the mapping constraint and is assumed in the shader.
+float ApplyPerPixelDisplacement(FragInputs input, float3 V, inout LayerTexCoord layerTexCoord, float4 blendMasks)
+{
+#if defined(_PIXEL_DISPLACEMENT) && LAYERS_HEIGHTMAP_ENABLE
+    bool isPlanar = false;
+    bool isTriplanar = false;
+
+    // To know if we are planar or triplanar just need to check if any of the active heightmap layer is true as they are enforce to be the same mapping
+#if defined(_HEIGHTMAP0)
+    isPlanar = layerTexCoord.base0.mappingType == UV_MAPPING_PLANAR;
+    isTriplanar = layerTexCoord.base0.mappingType == UV_MAPPING_TRIPLANAR;
+#endif
+
+#if defined(_HEIGHTMAP1)
+    isPlanar = layerTexCoord.base1.mappingType == UV_MAPPING_PLANAR;
+    isTriplanar = layerTexCoord.base1.mappingType == UV_MAPPING_TRIPLANAR;
+#endif
+
+#if _LAYER_COUNT >= 3
+#if defined(_HEIGHTMAP2)
+    isPlanar = layerTexCoord.base2.mappingType == UV_MAPPING_PLANAR;
+    isTriplanar = layerTexCoord.base2.mappingType == UV_MAPPING_TRIPLANAR;
+#endif
+#endif
+
+#if _LAYER_COUNT >= 4
+#if defined(_HEIGHTMAP3)
+    isPlanar = layerTexCoord.base3.mappingType == UV_MAPPING_PLANAR;
+    isTriplanar = layerTexCoord.base3.mappingType == UV_MAPPING_TRIPLANAR;
+#endif
+#endif
+
+    // Compute lod as we will sample inside a loop(so can't use regular sampling)
+    // Note: It appear that CALCULATE_TEXTURE2D_LOD only return interger lod. We want to use float lod to have smoother transition and fading, so do our own calculation.
+    // Approximation of lod to used. Be conservative here, we will take the highest mip of all layers.
+    // Remember, we assume that we used the same mapping for all layer, so only size matter.
+    float2 minUvSize = GetMinUvSize(layerTexCoord);
+    float lod = ComputeTextureLOD(minUvSize);
+
+    // TODO: Here we calculate the scale transform from world to UV space , which is what we have done in GetLayerTexCoord but without the texBias.
+    // Mean we must also apply the same "additionalTiling", currently not apply Also precompute all this!
+    float  maxHeight0 = abs(_HeightAmplitude0);
+    float  maxHeight1 = abs(_HeightAmplitude1);
+    float  maxHeight2 = abs(_HeightAmplitude2);
+    float  maxHeight3 = abs(_HeightAmplitude3);
+
+    ApplyDisplacementTileScale(maxHeight0, maxHeight1, maxHeight2, maxHeight3);
+#if defined(_MAIN_LAYER_INFLUENCE_MODE) && defined(_HEIGHTMAP0)
+    maxHeight1 += abs(_HeightAmplitude0) * _InheritBaseHeight1;
+    maxHeight2 += abs(_HeightAmplitude0) * _InheritBaseHeight2;
+    maxHeight3 += abs(_HeightAmplitude0) * _InheritBaseHeight3;
+#endif
+
+    float weights[_MAX_LAYER];
+    ComputeMaskWeights(blendMasks, weights);
+    float maxHeight = BlendLayeredScalar(maxHeight0, maxHeight1, maxHeight2, maxHeight3, weights);
+
+    float2 worldScale0 = (isPlanar || isTriplanar) ? _TexWorldScale0.xx : _InvPrimScale.xy;
+    float2 worldScale1 = (isPlanar || isTriplanar) ? _TexWorldScale1.xx : _InvPrimScale.xy;
+    float2 worldScale2 = (isPlanar || isTriplanar) ? _TexWorldScale2.xx : _InvPrimScale.xy;
+    float2 worldScale3 = (isPlanar || isTriplanar) ? _TexWorldScale3.xx : _InvPrimScale.xy;
+
+    PerPixelHeightDisplacementParam ppdParam;
+    ppdParam.blendMasks = blendMasks;
+    ppdParam.uvSpaceScale[0] = _BaseColorMap0_ST.xy * worldScale0;// *maxHeight0;
+    ppdParam.uvSpaceScale[1] = _BaseColorMap1_ST.xy * worldScale1;// *maxHeight1;
+    ppdParam.uvSpaceScale[2] = _BaseColorMap2_ST.xy * worldScale2;// *maxHeight2;
+    ppdParam.uvSpaceScale[3] = _BaseColorMap3_ST.xy * worldScale3;// *maxHeight3;
+
+    float uvSpaceScale = BlendLayeredScalar(ppdParam.uvSpaceScale[0], ppdParam.uvSpaceScale[1], ppdParam.uvSpaceScale[2], ppdParam.uvSpaceScale[3], weights);
+
+    float2 scaleOffsetDetails0 =_DetailMap0_ST.xy;
+    float2 scaleOffsetDetails1 =_DetailMap1_ST.xy;
+    float2 scaleOffsetDetails2 =_DetailMap2_ST.xy;
+    float2 scaleOffsetDetails3 =_DetailMap3_ST.xy;
+
+    float height; // final height processed
+    float NdotV;
+
+    // planar/triplanar
+    float2 uvXZ;
+    float2 uvXY;
+    float2 uvZY;
+    GetTriplanarCoordinate(V, uvXZ, uvXY, uvZY);
+
+    // We need to calculate the texture space direction. It depends on the mapping.
+    if (isTriplanar)
+    {
+        // This is not supported currently
+        height = 1.0;
+        NdotV  = 1.0;
+    }
+    else
+    {
+        // For planar it is uv too, not uvXZ
+        ppdParam.uv[0] = layerTexCoord.base0.uv;
+        ppdParam.uv[1] = layerTexCoord.base1.uv;
+        ppdParam.uv[2] = layerTexCoord.base2.uv;
+        ppdParam.uv[3] = layerTexCoord.base3.uv;
+
+        // Note: The TBN is not normalize as it is based on mikkt. We should normalize it, but POM is always use on simple enough surface that mean it is not required (save 2 normalize). Tag: SURFACE_GRADIENT
+        // Note: worldToTangent is only define for UVSet0, so we expect that layer that use POM have UVSet0
+        float3 viewDirTS = isPlanar ? float3(uvXZ, V.y) : TransformWorldToTangent(V, input.worldToTangent) * GetDisplacementObjectScale(false).xzy; // Switch from Y-up to Z-up (as we move to tangent space)
+        NdotV = viewDirTS.z;
+
+        // Transform the view vector into the UV space.
+        float3 viewDirUV = normalize(float3(viewDirTS.xy * maxHeight, viewDirTS.z));
+        float  unitAngle = saturate(FastACosPos(viewDirUV.z) * INV_HALF_PI);            // TODO: optimize
+        int    numSteps = (int)lerp(_PPDMinSamples, _PPDMaxSamples, unitAngle);
+        float2 offset = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirUV, ppdParam, height);
+        offset *= uvSpaceScale;
+
+        layerTexCoord.base0.uv += offset;
+        layerTexCoord.base1.uv += offset;
+        layerTexCoord.base2.uv += offset;
+        layerTexCoord.base3.uv += offset;
+
+        layerTexCoord.details0.uv += offset * scaleOffsetDetails0;
+        layerTexCoord.details1.uv += offset * scaleOffsetDetails1;
+        layerTexCoord.details2.uv += offset * scaleOffsetDetails2;
+        layerTexCoord.details3.uv += offset * scaleOffsetDetails3;
+    }
+
+    // Since POM "pushes" geometry inwards (rather than extrude it), { height = height - 1 }.
+    // Since the result is used as a 'depthOffsetVS', it needs to be positive, so we flip the sign. { height = -height + 1 }.
+
+    float verticalDisplacement = maxHeight - height * maxHeight;
+    return verticalDisplacement / max(NdotV, 0.001);
+#else
+    return 0.0;
+#endif
+}
+
+// Calculate displacement for per vertex displacement mapping
+float3 ComputePerVertexDisplacement(LayerTexCoord layerTexCoord, float4 vertexColor, float lod)
+{
+#if LAYERS_HEIGHTMAP_ENABLE
+    float height0 = (SAMPLE_UVMAPPING_TEXTURE2D_LOD(_HeightMap0, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base0, lod).r - _HeightCenter0) * _HeightAmplitude0;
+    float height1 = (SAMPLE_UVMAPPING_TEXTURE2D_LOD(_HeightMap1, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base1, lod).r - _HeightCenter1) * _HeightAmplitude1;
+    float height2 = (SAMPLE_UVMAPPING_TEXTURE2D_LOD(_HeightMap2, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base2, lod).r - _HeightCenter2) * _HeightAmplitude2;
+    float height3 = (SAMPLE_UVMAPPING_TEXTURE2D_LOD(_HeightMap3, SAMPLER_HEIGHTMAP_IDX, layerTexCoord.base3, lod).r - _HeightCenter3) * _HeightAmplitude3;
+    // Height is affected by tiling property and by object scale (depends on option).
+    // Apply scaling from tiling properties (TexWorldScale and tiling from BaseColor)
+    ApplyDisplacementTileScale(height0, height1, height2, height3);
+    // Nullify height that are not used, so compiler can remove unused case
+    SetEnabledHeightByLayer(height0, height1, height2, height3);
+
+    float4 blendMasks = GetBlendMask(layerTexCoord, vertexColor, true, lod);
+
+    #if defined(_HEIGHT_BASED_BLEND)
+    // Modify blendMask to take into account the height of the layer. Higher height should be more visible.
+    blendMasks = ApplyHeightBlend(float4(height0, height1, height2, height3), blendMasks);
+    #endif
+
+    float weights[_MAX_LAYER];
+    ComputeMaskWeights(blendMasks, weights);
+
+    // _MAIN_LAYER_INFLUENCE_MODE is a pure visual mode that doesn't contribute to the weights of a layer
+    // The motivation is like this: if a layer is visible, then we will apply influence on top of it (so it is only visual).
+    // This is what is done for normal and baseColor and we do the same for height.
+    // Note that if we apply influence before ApplyHeightBlend, then have a different behavior.
+#if defined(_MAIN_LAYER_INFLUENCE_MODE) && defined(_HEIGHTMAP0)
+    // Add main layer influence if any (simply add main layer add on other layer)
+    // We multiply by the input mask for the first layer (blendMask.a) because if the mask here is black it means that the layer
+    // is not actually underneath any visible layer so we don't want to inherit its height.
+    float influenceMask = blendMasks.a;
+    #ifdef _INFLUENCEMASK_MAP
+    influenceMask *= GetInfluenceMask(layerTexCoord, true, lod);
+    #endif
+    height1 += height0 * _InheritBaseHeight1 * influenceMask;
+    height2 += height0 * _InheritBaseHeight2 * influenceMask;
+    height3 += height0 * _InheritBaseHeight3 * influenceMask;
+#endif
+
+    float heightResult = BlendLayeredScalar(height0, height1, height2, height3, weights).xxx;
+
+   // Applying scaling of the object if requested
+    #ifdef _VERTEX_DISPLACEMENT_LOCK_OBJECT_SCALE
+    float3 objectScale = GetDisplacementObjectScale(true);
+    // Reminder: mappingType is know statically, so code below is optimize by the compiler
+    // Planar and Triplanar are in world space thus it is independent of object scale
+    return heightResult.xxx * BlendLayeredVector3( ((layerTexCoord.base0.mappingType == UV_MAPPING_UVSET) ? objectScale : float3(1.0, 1.0, 1.0)),
+                                                   ((layerTexCoord.base1.mappingType == UV_MAPPING_UVSET) ? objectScale : float3(1.0, 1.0, 1.0)),
+                                                   ((layerTexCoord.base2.mappingType == UV_MAPPING_UVSET) ? objectScale : float3(1.0, 1.0, 1.0)),
+                                                   ((layerTexCoord.base3.mappingType == UV_MAPPING_UVSET) ? objectScale : float3(1.0, 1.0, 1.0)), weights);
+    #else
+    return heightResult.xxx;
+    #endif
+#else
+    return float3(0.0, 0.0, 0.0);
+#endif
+}

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitDataDisplacement.hlsl.meta

+fileFormatVersion: 2
+guid: 8e54c49e8dac44c40b4f44df4ea0740a
+timeCreated: 1508932230
+licenseType: Pro
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitDataDisplacement.hlsl

+// Share by Lit and LayeredLit. Return object scaling for displacement map depends if it is vertex (affect vertex displacement) or pixel displacement (affect tiling)
+float3 GetDisplacementObjectScale(bool vertexDisplacement)
+{
+    float3 objectScale = float3(1.0, 1.0, 1.0);
+
+        // TODO: This should be an uniform for the object, this code should be remove once we have it. - Workaround for now
+        // To handle object scaling with pixel displacement we need to multiply the view vector by the inverse scale.
+        // To Handle object scaling with vertex/tessellation displacement we must multiply displacement by object scale
+        // Currently we extract either the scale (ObjectToWorld) or the inverse scale (worldToObject) directly by taking the transform matrix
+        float4x4 worldTransform;
+    if (vertexDisplacement)
+    {
+        worldTransform = GetObjectToWorldMatrix();
+    }
+
+    else
+    {
+        worldTransform = GetWorldToObjectMatrix();
+    }
+
+    objectScale.x = length(float3(worldTransform._m00, worldTransform._m01, worldTransform._m02));
+    // In the specific case of pixel displacement mapping, to get a consistent behavior compare to tessellation we require to not take into account y scale if lock object scale is not enabled
+#if !defined(_PIXEL_DISPLACEMENT) || (defined(_PIXEL_DISPLACEMENT_LOCK_OBJECT_SCALE))
+    objectScale.y = length(float3(worldTransform._m10, worldTransform._m11, worldTransform._m12));
+#endif
+    objectScale.z = length(float3(worldTransform._m20, worldTransform._m21, worldTransform._m22));
+
+    return objectScale;
+}
+
+#ifndef LAYERED_LIT_SHADER
+
+// Note: This function is call by both Per vertex and Per pixel displacement
+float GetMaxDisplacement()
+{
+    float maxDisplacement = 0.0;
+#if defined(_HEIGHTMAP)
+    maxDisplacement = abs(_HeightAmplitude); // _HeightAmplitude can be negative if min and max are inverted, but the max displacement must be positive
+#endif
+    return maxDisplacement;
+}
+
+// Return the minimun uv size for all layers including triplanar
+float2 GetMinUvSize(LayerTexCoord layerTexCoord)
+{
+    float2 minUvSize = float2(FLT_MAX, FLT_MAX);
+
+#if defined(_HEIGHTMAP)
+    if (layerTexCoord.base.mappingType == UV_MAPPING_TRIPLANAR)
+    {
+        minUvSize = min(layerTexCoord.base.uvZY * _HeightMap_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base.uvXZ * _HeightMap_TexelSize.zw, minUvSize);
+        minUvSize = min(layerTexCoord.base.uvXY * _HeightMap_TexelSize.zw, minUvSize);
+    }
+    else
+    {
+        minUvSize = min(layerTexCoord.base.uv * _HeightMap_TexelSize.zw, minUvSize);
+    }
+#endif
+
+    return minUvSize;
+}
+
+struct PerPixelHeightDisplacementParam
+{
+    float2 uv;
+};
+
+float ComputePerPixelHeightDisplacement(float2 texOffsetCurrent, float lod, PerPixelHeightDisplacementParam param)
+{
+    // Note: No multiply by amplitude here. This is include in the maxHeight provide to POM
+    // Tiling is automatically handled correctly here.
+    return SAMPLE_TEXTURE2D_LOD(_HeightMap, sampler_HeightMap, param.uv + texOffsetCurrent, lod).r;
+}
+
+#include "../../../Core/ShaderLibrary/PerPixelDisplacement.hlsl"
+
+void ApplyDisplacementTileScale(inout float height)
+{
+    // Inverse tiling scale = 2 / (abs(_BaseColorMap_ST.x) + abs(_BaseColorMap_ST.y)
+    // Inverse tiling scale *= (1 / _TexWorldScale) if planar or triplanar
+#ifdef _DISPLACEMENT_LOCK_TILING_SCALE
+    height *= _InvTilingScale;
+#endif
+}
+
+float ApplyPerPixelDisplacement(FragInputs input, float3 V, inout LayerTexCoord layerTexCoord)
+{
+#if defined(_PIXEL_DISPLACEMENT) && defined(_HEIGHTMAP)
+    // These variables are known at the compile time.
+    bool isPlanar = layerTexCoord.base.mappingType == UV_MAPPING_PLANAR;
+    bool isTriplanar = layerTexCoord.base.mappingType == UV_MAPPING_TRIPLANAR;
+
+    // See comment in layered version for details
+    float  maxHeight = GetMaxDisplacement();
+    ApplyDisplacementTileScale(maxHeight);
+    float2 minUvSize = GetMinUvSize(layerTexCoord);
+    float  lod       = ComputeTextureLOD(minUvSize);
+
+    // TODO: precompute uvSpaceScale
+    float2 invPrimScale = (isPlanar || isTriplanar) ? float2(1.0, 1.0) : _InvPrimScale.xy;
+    float  worldScale   = (isPlanar || isTriplanar) ? _TexWorldScale : 1.0;
+    float2 uvSpaceScale = invPrimScale * _BaseColorMap_ST.xy * (worldScale * maxHeight);
+    float2 scaleOffsetDetails = _DetailMap_ST.xy;
+
+    PerPixelHeightDisplacementParam ppdParam;
+
+    float height = 0; // final height processed
+    float NdotV  = 0;
+
+    // planar/triplanar
+    float2 uvXZ;
+    float2 uvXY;
+    float2 uvZY;
+    GetTriplanarCoordinate(V, uvXZ, uvXY, uvZY);
+
+    // TODO: support object space planar/triplanar ?
+
+    // We need to calculate the texture space direction. It depends on the mapping.
+    if (isTriplanar)
+    {
+        float planeHeight;
+
+        // Perform a POM in each direction and modify appropriate texture coordinate
+        [branch] if (layerTexCoord.triplanarWeights.x >= 0.001)
+        {
+            ppdParam.uv      = layerTexCoord.base.uvZY;
+            float3 viewDirTS = float3(uvZY, abs(V.x));
+            float3 viewDirUV = normalize(float3(viewDirTS.xy * uvSpaceScale, viewDirTS.z)); // TODO: skip normalize
+            float  unitAngle = saturate(FastACosPos(viewDirUV.z) * INV_HALF_PI);            // TODO: optimize
+            int    numSteps  = (int)lerp(_PPDMinSamples, _PPDMaxSamples, unitAngle);
+            float2 offset    = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirUV, ppdParam, planeHeight);
+
+            // Apply offset to all triplanar UVSet
+            layerTexCoord.base.uvZY    += offset;
+            layerTexCoord.details.uvZY += offset * scaleOffsetDetails;
+            height += layerTexCoord.triplanarWeights.x * planeHeight;
+            NdotV  += layerTexCoord.triplanarWeights.x * viewDirTS.z;
+        }
+
+        [branch] if (layerTexCoord.triplanarWeights.y >= 0.001)
+        {
+            ppdParam.uv      = layerTexCoord.base.uvXZ;
+            float3 viewDirTS = float3(uvXZ, abs(V.y));
+            float3 viewDirUV = normalize(float3(viewDirTS.xy * uvSpaceScale, viewDirTS.z)); // TODO: skip normalize
+            float  unitAngle = saturate(FastACosPos(viewDirUV.z) * INV_HALF_PI);            // TODO: optimize
+            int    numSteps  = (int)lerp(_PPDMinSamples, _PPDMaxSamples, unitAngle);
+            float2 offset    = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirUV, ppdParam, planeHeight);
+
+            layerTexCoord.base.uvXZ    += offset;
+            layerTexCoord.details.uvXZ += offset * scaleOffsetDetails;
+            height += layerTexCoord.triplanarWeights.y * planeHeight;
+            NdotV  += layerTexCoord.triplanarWeights.y * viewDirTS.z;
+        }
+
+        [branch] if (layerTexCoord.triplanarWeights.z >= 0.001)
+        {
+            ppdParam.uv      = layerTexCoord.base.uvXY;
+            float3 viewDirTS = float3(uvXY, abs(V.z));
+            float3 viewDirUV = normalize(float3(viewDirTS.xy * uvSpaceScale, viewDirTS.z)); // TODO: skip normalize
+            float  unitAngle = saturate(FastACosPos(viewDirUV.z) * INV_HALF_PI);            // TODO: optimize
+            int    numSteps  = (int)lerp(_PPDMinSamples, _PPDMaxSamples, unitAngle);
+            float2 offset    = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirUV, ppdParam, planeHeight);
+
+            layerTexCoord.base.uvXY    += offset;
+            layerTexCoord.details.uvXY += offset * scaleOffsetDetails;
+            height += layerTexCoord.triplanarWeights.z * planeHeight;
+            NdotV  += layerTexCoord.triplanarWeights.z * viewDirTS.z;
+        }
+    }
+    else
+    {
+        ppdParam.uv = layerTexCoord.base.uv; // For planar it is uv too, not uvXZ
+
+        // Note: The TBN is not normalize as it is based on mikkt. We should normalize it, but POM is always use on simple enough surfarce that mean it is not required (save 2 normalize). Tag: SURFACE_GRADIENT
+        float3 viewDirTS = isPlanar ? float3(uvXZ, V.y) : TransformWorldToTangent(V, input.worldToTangent) * GetDisplacementObjectScale(false).xzy; // Switch from Y-up to Z-up (as we move to tangent space)
+        NdotV = viewDirTS.z;
+
+        // Transform the view vector into the UV space.
+        float3 viewDirUV    = normalize(float3(viewDirTS.xy * uvSpaceScale, viewDirTS.z)); // TODO: skip normalize
+        float  unitAngle    = saturate(FastACosPos(viewDirUV.z) * INV_HALF_PI);            // TODO: optimize
+        int    numSteps     = (int)lerp(_PPDMinSamples, _PPDMaxSamples, unitAngle);
+        float2 offset       = ParallaxOcclusionMapping(lod, _PPDLodThreshold, numSteps, viewDirUV, ppdParam, height);
+
+        // Apply offset to all UVSet0 / planar
+        layerTexCoord.base.uv += offset;
+        // Note: Applying offset on detail uv is only correct if it use the same UVSet or is planar or triplanar. It is up to the user to do the correct thing.
+        layerTexCoord.details.uv += offset * scaleOffsetDetails;
+    }
+
+    // Since POM "pushes" geometry inwards (rather than extrude it), { height = height - 1 }.
+    // Since the result is used as a 'depthOffsetVS', it needs to be positive, so we flip the sign.
+    float verticalDisplacement = maxHeight - height * maxHeight;
+    return verticalDisplacement / max(NdotV, 0.001);
+#else
+    return 0.0;
+#endif
+}
+
+// Calculate displacement for per vertex displacement mapping
+float3 ComputePerVertexDisplacement(LayerTexCoord layerTexCoord, float4 vertexColor, float lod)
+{
+    float height = (SAMPLE_UVMAPPING_TEXTURE2D_LOD(_HeightMap, sampler_HeightMap, layerTexCoord.base, lod).r - _HeightCenter) * _HeightAmplitude;
+
+    // Height is affected by tiling property and by object scale (depends on option).
+    // Apply scaling from tiling properties (TexWorldScale and tiling from BaseColor)
+    ApplyDisplacementTileScale(height);
+    // Applying scaling of the object if requested
+#ifdef _VERTEX_DISPLACEMENT_LOCK_OBJECT_SCALE
+    float3 objectScale = GetDisplacementObjectScale(true);
+    // Reminder: mappingType is know statically, so code below is optimize by the compiler
+    // Planar and Triplanar are in world space thus it is independent of object scale
+    return height.xxx * ((layerTexCoord.base.mappingType == UV_MAPPING_UVSET) ? objectScale : float3(1.0, 1.0, 1.0));
+#else
+    return height.xxx;
+#endif
+}
+
+#endif // #ifndef LAYERED_LIT_SHADER
+

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