HDRenderPipeline: Refactor UI for subsurface

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/Lit/Editor/BaseLitUI.cs

             public static GUIContent tessellationBackFaceCullEpsilonText = new GUIContent("Triangle culling Epsilon", "If -1.0 back face culling is enabled for tessellation, higher number mean more aggressive culling and better performance");
             public static GUIContent tessellationObjectScaleText = new GUIContent("Enable object scale", "Tesselation displacement will take into account the object scale - Only work with uniform positive scale");
 
-            public static GUIContent materialIDText          = new GUIContent("Material Class", "Subsurface Scattering: enable for translucent materials such as skin, vegetation, fruit, marble, wax and milk.");
-            public static GUIContent subsurfaceProfileText   = new GUIContent("Subsurface scattering profile", "A profile determines the shape of the blur filter.");
-            public static GUIContent subsurfaceRadiusText    = new GUIContent("Subsurface scattering radius", "Determines the range of the blur.");
-            public static GUIContent subsurfaceRadiusMapText = new GUIContent("Subsurface scattering radius map", "Determines the range of the blur.");
-            public static GUIContent thicknessText           = new GUIContent("Thickness", "If subsurface scattering is enabled, low values allow some light to be transmitted through the object.");
-            public static GUIContent thicknessMapText        = new GUIContent("Thickness map", "If subsurface scattering is enabled, low values allow some light to be transmitted through the object.");
+            public static GUIContent materialIDText = new GUIContent("Material type", "Subsurface Scattering: enable for translucent materials such as skin, vegetation, fruit, marble, wax and milk.");
+            public static GUIContent subsurfaceProfileText = new GUIContent("Subsurface profile", "A profile determines the shape of the blur filter.");
+            public static GUIContent subsurfaceRadiusText = new GUIContent("Subsurface radius", "Determines the range of the blur.");
+            public static GUIContent subsurfaceRadiusMapText = new GUIContent("Subsurface radius map", "Determines the range of the blur.");
+            public static GUIContent thicknessText = new GUIContent("Thickness", "If subsurface scattering is enabled, low values allow some light to be transmitted through the object.");
+            public static GUIContent thicknessMapText = new GUIContent("Thickness map", "If subsurface scattering is enabled, low values allow some light to be transmitted through the object.");
         }
 
         public enum SurfaceType

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/Lit/Editor/LitUI.cs

             UseEmissiveMask,
         }
 
+        public enum MaterialIDType
+        {
+            Standard = 0,
+            SubsurfaceScattering = 1,
+            ClearCoat = 2,
+            SpecularColor = 3
+        }
+
         protected MaterialProperty smoothnessMapChannel = null;
         protected const string kSmoothnessTextureChannel = "_SmoothnessTextureChannel";
         protected MaterialProperty UVBase = null;
 
             EditorGUI.indentLevel++;
             GUILayout.Label(Styles.InputsOptionsText, EditorStyles.boldLabel);
+            m_MaterialEditor.ShaderProperty(materialID, Styles.materialIDText);
+
             m_MaterialEditor.ShaderProperty(smoothnessMapChannel, Styles.smoothnessMapChannelText);
             m_MaterialEditor.ShaderProperty(UVBase, enableUVDetail ? Styles.UVBaseDetailMappingText : Styles.UVBaseMappingText);
 
             m_MaterialEditor.ShaderProperty(normalMapSpace, Styles.normalMapSpaceText);
             m_MaterialEditor.ShaderProperty(emissiveColorMode, Styles.emissiveColorModeText);
             m_MaterialEditor.ShaderProperty(enablePerPixelDisplacement, Styles.enablePerPixelDisplacementText);
-            m_MaterialEditor.ShaderProperty(ppdMinSamples, Styles.ppdMinSamplesText);
-            m_MaterialEditor.ShaderProperty(ppdMaxSamples, Styles.ppdMaxSamplesText);
-            ppdMinSamples.floatValue = Mathf.Min(ppdMinSamples.floatValue, ppdMaxSamples.floatValue);
-            m_MaterialEditor.ShaderProperty(ppdLodThreshold, Styles.ppdLodThresholdText);
+            if (enablePerPixelDisplacement.floatValue > 0.0)
+            {
+                EditorGUI.indentLevel++;
+                m_MaterialEditor.ShaderProperty(ppdMinSamples, Styles.ppdMinSamplesText);
+                m_MaterialEditor.ShaderProperty(ppdMaxSamples, Styles.ppdMaxSamplesText);
+                ppdMinSamples.floatValue = Mathf.Min(ppdMinSamples.floatValue, ppdMaxSamples.floatValue);
+                m_MaterialEditor.ShaderProperty(ppdLodThreshold, Styles.ppdLodThresholdText);
+                EditorGUI.indentLevel--;
+            }
-            m_MaterialEditor.ShaderProperty(materialID,          Styles.materialIDText);
-            m_MaterialEditor.ShaderProperty(subsurfaceProfile,   Styles.subsurfaceProfileText);
-            m_MaterialEditor.ShaderProperty(subsurfaceRadius,    Styles.subsurfaceRadiusText);
-            m_MaterialEditor.ShaderProperty(subsurfaceRadiusMap, Styles.subsurfaceRadiusMapText);
-            m_MaterialEditor.ShaderProperty(thickness,           Styles.thicknessText);
-            m_MaterialEditor.ShaderProperty(thicknessMap,        Styles.thicknessMapText);
+            EditorGUI.indentLevel--;
+        }
+
+        protected void ShaderSSSInputGUI()
+        {
+            m_MaterialEditor.ShaderProperty(subsurfaceProfile, Styles.subsurfaceProfileText);
+            m_MaterialEditor.ShaderProperty(subsurfaceRadius, Styles.subsurfaceRadiusText);
+            m_MaterialEditor.TexturePropertySingleLine(Styles.subsurfaceRadiusMapText, subsurfaceRadiusMap);
+            m_MaterialEditor.ShaderProperty(thickness, Styles.thicknessText);
+            m_MaterialEditor.TexturePropertySingleLine(Styles.thicknessMapText, thicknessMap);
+        }
-            EditorGUI.indentLevel--;
+        protected void ShaderStandardInputGUI()
+        {
+            m_MaterialEditor.TexturePropertySingleLine(Styles.tangentMapText, tangentMap);
+            m_MaterialEditor.ShaderProperty(anisotropy, Styles.anisotropyText);
+            m_MaterialEditor.TexturePropertySingleLine(Styles.anisotropyMapText, anisotropyMap);
         }
 
         override protected void ShaderInputGUI()
                 EditorGUI.indentLevel--;
             }
 
-            m_MaterialEditor.TexturePropertySingleLine(Styles.tangentMapText, tangentMap);
-
-            m_MaterialEditor.ShaderProperty(anisotropy, Styles.anisotropyText);
-            
-            m_MaterialEditor.TexturePropertySingleLine(Styles.anisotropyMapText, anisotropyMap);
+            if ((MaterialIDType)materialID.floatValue == MaterialIDType.Standard)
+            {
+                ShaderStandardInputGUI();
+            }
+            else if ((MaterialIDType)materialID.floatValue == MaterialIDType.SubsurfaceScattering)
+            {
+                ShaderSSSInputGUI();
+            }
 
             EditorGUILayout.Space();
             GUILayout.Label(Styles.textureControlText, EditorStyles.label);

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/Lit/Lit.shader

         _DetailHeightScale("_DetailHeightScale", Range(-2.0, 2.0)) = 1
         _DetailAOScale("_DetailAOScale", Range(-2.0, 2.0)) = 1
 
-        [Enum(Standard, 0, Subsurface Scattering, 1, Clear Coat, 2)] _MaterialID("Material Class", Int) = 0
+        [Enum(Standard, 0, Subsurface Scattering, 1, Clear Coat, 2, Specular Color, 3)] _MaterialID("MaterialId", Int) = 0
         _SubsurfaceProfile("Subsurface Profile", Int) = 0
         _SubsurfaceRadius("Subsurface Radius", Range(0.0, 1.0)) = 0
         _SubsurfaceRadiusMap("Subsurface Radius Map", 2D) = "white" {}

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/Lit/LitData.hlsl

                             , maxDisplacement);
 #endif
 #endif
+
+    return maxDisplacement;
 }
 
 // Return the minimun uv size for all layers including triplanar

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/Lit/LitTessellation.shader

         _DetailHeightScale("_DetailHeightScale", Range(-2.0, 2.0)) = 1
         _DetailAOScale("_DetailAOScale", Range(-2.0, 2.0)) = 1
 
-        [Enum(Standard, 0, Subsurface Scattering, 1, Clear Coat, 2)] _MaterialID("Material Class", Int) = 0
+        [Enum(Standard, 0, Subsurface Scattering, 1, Clear Coat, 2, Specular Color, 3)] _MaterialID("MaterialId", Int) = 0
         _SubsurfaceProfile("Subsurface Profile", Int) = 0
         _SubsurfaceRadius("Subsurface Radius", Range(0.0, 1.0)) = 0
         _SubsurfaceRadiusMap("Subsurface Radius Map", 2D) = "white" {}