Replace EmissiveIntesnity by EmissveColor HDR

Remove all occurrence of EmissiveIntensity. Emissive color is now HDR (with HDR color picker). Data need to be updated

com.unity.render-pipelines.high-definition/CHANGELOG.md

 ### Changed, Removals and deprecations
 - Removed GlobalLightLoopSettings.maxPlanarReflectionProbes and instead use value of GlobalLightLoopSettings.planarReflectionProbeCacheSize
 - Changed SupportForwardOnly to SupportOnlyForward in render pipeline settings
+- Remove EmissiveIntensity parameter and change EmissiveColor to be HDR (Matching Builtin Unity behavior) - Data need to be updated
 
 ### Bug fixes
 - Fix issue with LOD transition and instancing

com.unity.render-pipelines.high-definition/HDRP/Editor/Material/LayeredLit/LayeredLitUI.cs

             return layerChanged;
         }
 
-        protected override bool ShouldEmissionBeEnabled(Material mat)
+        protected override bool ShouldEmissionBeEnabled(Material material)
-            return mat.GetFloat(kEmissiveIntensity) > 0.0f;
+            return (material.GetColor(kEmissiveColor) != Color.black) || material.GetTexture(kEmissiveColorMap);
         }
 
         protected override void SetupMaterialKeywordsAndPassInternal(Material material)

com.unity.render-pipelines.high-definition/HDRP/Editor/Material/Lit/LitUI.cs

 
             // Emissive
             public static string emissiveLabelText = "Emissive Inputs";
-            public static GUIContent emissiveText = new GUIContent("Emissive Color", "Emissive");
-            public static GUIContent emissiveIntensityText = new GUIContent("Emissive Intensity", "Emissive");
+            public static GUIContent emissiveText = new GUIContent("Emissive Color", "Emissive Color (linear RGB) in nits unit");
             public static GUIContent albedoAffectEmissiveText = new GUIContent("Albedo Affect Emissive", "Specifies whether or not the emissive color is multiplied by the albedo.");
 
             public static GUIContent normalMapSpaceWarning = new GUIContent("Object space normal can't be use with triplanar mapping.");
         protected const string kEmissiveColor = "_EmissiveColor";
         protected MaterialProperty emissiveColorMap = null;
         protected const string kEmissiveColorMap = "_EmissiveColorMap";
-        protected MaterialProperty emissiveIntensity = null;
-        protected const string kEmissiveIntensity = "_EmissiveIntensity";
         protected MaterialProperty albedoAffectEmissive = null;
         protected const string kAlbedoAffectEmissive = "_AlbedoAffectEmissive";
         protected MaterialProperty UVEmissive = null;
             emissiveColorMode = FindProperty(kEmissiveColorMode, props);
             emissiveColor = FindProperty(kEmissiveColor, props);
             emissiveColorMap = FindProperty(kEmissiveColorMap, props);
-            emissiveIntensity = FindProperty(kEmissiveIntensity, props);
             albedoAffectEmissive = FindProperty(kAlbedoAffectEmissive, props);
 
             UVEmissive = FindProperty(kUVEmissive, props);
                 EditorGUI.indentLevel--;
             }
 
-            m_MaterialEditor.ShaderProperty(emissiveIntensity, Styles.emissiveIntensityText);
             m_MaterialEditor.ShaderProperty(albedoAffectEmissive, Styles.albedoAffectEmissiveText);
             EditorGUI.indentLevel--;
         }
             m_MaterialEditor.ShaderProperty(enableSpecularOcclusion, Styles.enableSpecularOcclusionText);
         }
 
-        protected override bool ShouldEmissionBeEnabled(Material mat)
+        protected override bool ShouldEmissionBeEnabled(Material material)
-            return mat.GetFloat(kEmissiveIntensity) > 0.0f;
+            return (material.GetColor(kEmissiveColor) != Color.black) || material.GetTexture(kEmissiveColorMap);
         }
 
         protected override void SetupMaterialKeywordsAndPassInternal(Material material)

com.unity.render-pipelines.high-definition/HDRP/Editor/Material/Lit/StandardsToHDLitMaterialUpgrader.cs

                     break;
             }
 
-            // Emission: Convert the HDR emissive color to ldr color + intensity
-            float intensity = Mathf.Max(hdrEmission.r, Mathf.Max(hdrEmission.g, hdrEmission.b));
-
-            if (intensity > 1f)
-            {
-                hdrEmission.r /= intensity;
-                hdrEmission.g /= intensity;
-                hdrEmission.b /= intensity;
-            }
-            else
-                intensity = 1f;
-
-            intensity = Mathf.Pow(intensity, 2.2f); // Gamma to Linear conversion
-
-            dstMaterial.SetFloat("_EmissiveIntensity", intensity);
 
             HDEditorUtils.ResetMaterialKeywords(dstMaterial);
         }

com.unity.render-pipelines.high-definition/HDRP/Editor/Material/StackLit/StackLitUI.cs

         protected const string k_EmissiveColor = "_EmissiveColor";
         protected const string k_EmissiveColorMap = "_EmissiveColorMap";
         protected const string k_EmissiveColorMapUV = "_EmissiveColorMapUV";
-        protected const string k_EmissiveIntensity = "_EmissiveIntensity";
         protected const string k_AlbedoAffectEmissive = "_AlbedoAffectEmissive";
 
         // Coat
         protected const string kStencilWriteMaskMV = "_StencilWriteMaskMV";
 
         protected const string k_GeometricNormalFilteringEnabled = "_GeometricNormalFilteringEnabled";
-        protected const string k_TextureNormalFilteringEnabled = "_TextureNormalFilteringEnabled";        
+        protected const string k_TextureNormalFilteringEnabled = "_TextureNormalFilteringEnabled";
 
         #endregion
 
                 new GroupProperty(this, "_Emissive", "Emissive", new BaseProperty[]
                 {
                     new TextureProperty(this, k_EmissiveColorMap, k_EmissiveColor, "Emissive Color", "Emissive", true, false),
-                    new Property(this, k_EmissiveIntensity, "Emissive Intensity", "Emissive", false),
                     new Property(this, k_AlbedoAffectEmissive, "Albedo Affect Emissive", "Specifies whether or not the emissive color is multiplied by the albedo.", false),
                 }),
 
 
         protected override bool ShouldEmissionBeEnabled(Material material)
         {
-            return material.GetFloat(k_EmissiveIntensity) > 0.0f;
+            return (material.GetColor(k_EmissiveColor) != Color.black) || material.GetTexture(k_EmissiveColorMap);
         }
 
         protected override void FindBaseMaterialProperties(MaterialProperty[] props)

com.unity.render-pipelines.high-definition/HDRP/Editor/Material/Unlit/UnlitUI.cs

             public static GUIContent colorText = new GUIContent("Color", "Color");
 
             public static GUIContent emissiveText = new GUIContent("Emissive Color", "Emissive");
-            public static GUIContent emissiveIntensityText = new GUIContent("Emissive Intensity", "Emissive");
         }
 
         protected MaterialProperty color = null;
         protected const string kEmissiveColor = "_EmissiveColor";
         protected MaterialProperty emissiveColorMap = null;
         protected const string kEmissiveColorMap = "_EmissiveColorMap";
-        protected MaterialProperty emissiveIntensity = null;
-        protected const string kEmissiveIntensity = "_EmissiveIntensity";
 
         override protected void FindMaterialProperties(MaterialProperty[] props)
         {
             emissiveColor = FindProperty(kEmissiveColor, props);
             emissiveColorMap = FindProperty(kEmissiveColorMap, props);
-            emissiveIntensity = FindProperty(kEmissiveIntensity, props);
         }
 
         protected override void MaterialPropertiesGUI(Material material)
 
             m_MaterialEditor.TexturePropertySingleLine(Styles.emissiveText, emissiveColorMap, emissiveColor);
             m_MaterialEditor.TextureScaleOffsetProperty(emissiveColorMap);
-            m_MaterialEditor.ShaderProperty(emissiveIntensity, Styles.emissiveIntensityText);
 
             var surfaceTypeValue = (SurfaceType)surfaceType.floatValue;
             if (surfaceTypeValue == SurfaceType.Transparent)
         {
         }
 
-        protected override bool ShouldEmissionBeEnabled(Material mat)
+        protected override bool ShouldEmissionBeEnabled(Material material)
-            return mat.GetFloat(kEmissiveIntensity) > 0.0f;
+            return (material.GetColor(kEmissiveColor) != Color.black) || material.GetTexture(kEmissiveColorMap);
         }
 
         protected override void SetupMaterialKeywordsAndPassInternal(Material material)

com.unity.render-pipelines.high-definition/HDRP/Material/Builtin/BuiltinData.cs

             [SurfaceDataAttributes("Shadow Mask 3")]
             public float shadowMask3;
 
-            [SurfaceDataAttributes("Emissive Color", false, true)]
+            [SurfaceDataAttributes("Emissive Color", false, false)]
-            [SurfaceDataAttributes("Emissive Intensity")]
-            public float emissiveIntensity;
 
             // These is required for motion blur and temporalAA
             [SurfaceDataAttributes("Velocity")]

com.unity.render-pipelines.high-definition/HDRP/Material/Builtin/BuiltinData.cs.hlsl

 #define DEBUGVIEW_BUILTIN_BUILTINDATA_SHADOW_MASK_2 (104)
 #define DEBUGVIEW_BUILTIN_BUILTINDATA_SHADOW_MASK_3 (105)
 #define DEBUGVIEW_BUILTIN_BUILTINDATA_EMISSIVE_COLOR (106)
-#define DEBUGVIEW_BUILTIN_BUILTINDATA_EMISSIVE_INTENSITY (107)
-#define DEBUGVIEW_BUILTIN_BUILTINDATA_VELOCITY (108)
-#define DEBUGVIEW_BUILTIN_BUILTINDATA_DISTORTION (109)
-#define DEBUGVIEW_BUILTIN_BUILTINDATA_DISTORTION_BLUR (110)
-#define DEBUGVIEW_BUILTIN_BUILTINDATA_DEPTH_OFFSET (111)
+#define DEBUGVIEW_BUILTIN_BUILTINDATA_VELOCITY (107)
+#define DEBUGVIEW_BUILTIN_BUILTINDATA_DISTORTION (108)
+#define DEBUGVIEW_BUILTIN_BUILTINDATA_DISTORTION_BLUR (109)
+#define DEBUGVIEW_BUILTIN_BUILTINDATA_DEPTH_OFFSET (110)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.Builtin+LightTransportData:  static fields
     float shadowMask2;
     float shadowMask3;
     float3 emissiveColor;
-    float emissiveIntensity;
     float2 velocity;
     float2 distortion;
     float distortionBlur;
             break;
         case DEBUGVIEW_BUILTIN_BUILTINDATA_EMISSIVE_COLOR:
             result = builtindata.emissiveColor;
-            needLinearToSRGB = true;
-            break;
-        case DEBUGVIEW_BUILTIN_BUILTINDATA_EMISSIVE_INTENSITY:
-            result = builtindata.emissiveIntensity.xxx;
             break;
         case DEBUGVIEW_BUILTIN_BUILTINDATA_VELOCITY:
             result = float3(builtindata.velocity, 0.0);

com.unity.render-pipelines.high-definition/HDRP/Material/Builtin/BuiltinData.hlsl

         // TODO: we should not gamma correct, but easier to debug for now without correct high range value
         result = builtinData.bakeDiffuseLighting; needLinearToSRGB = true;
         break;
-    case DEBUGVIEW_BUILTIN_BUILTINDATA_EMISSIVE_COLOR:
-        // emissiveColor is premultiply by emissive intensity
-        result = (builtinData.emissiveColor / builtinData.emissiveIntensity); needLinearToSRGB = true;
-        break;
     case DEBUGVIEW_BUILTIN_BUILTINDATA_DEPTH_OFFSET:
         result = builtinData.depthOffset.xxx * 10.0; // * 10 assuming 1 unity is 1m
         break;

com.unity.render-pipelines.high-definition/HDRP/Material/LayeredLit/LayeredLit.shader

 
         [ToggleUI]  _EnableSpecularOcclusion("Enable specular occlusion", Float) = 0.0
 
-        _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
+        [HDR] _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
-        _EmissiveIntensity("EmissiveIntensity", Float) = 0
         [ToggleUI] _AlbedoAffectEmissive("Albedo Affect Emissive", Float) = 0.0
 
         [ToggleUI] _AlphaCutoffEnable("Alpha Cutoff Enable", Float) = 0.0

com.unity.render-pipelines.high-definition/HDRP/Material/LayeredLit/LayeredLitTessellation.shader

 
         [ToggleUI]  _EnableSpecularOcclusion("Enable specular occlusion", Float) = 0.0
 
-        _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
+        [HDR] _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
-        _EmissiveIntensity("EmissiveIntensity", Float) = 0
         [ToggleUI] _AlbedoAffectEmissive("Albedo Affect Emissive", Float) = 0.0
 
         [ToggleUI] _AlphaCutoffEnable("Alpha Cutoff Enable", Float) = 0.0

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/Lit.shader

         // These option below will cause different compilation flag.
         [ToggleUI]  _EnableSpecularOcclusion("Enable specular occlusion", Float) = 0.0
 
-        _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
+        [HDR] _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
-        _EmissiveIntensity("EmissiveIntensity", Float) = 0
         [ToggleUI] _AlbedoAffectEmissive("Albedo Affect Emissive", Float) = 0.0
 
         _DistortionVectorMap("DistortionVectorMap", 2D) = "black" {}

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/LitBuiltinData.hlsl

     builtinData.shadowMask3 = 0.0;
 #endif
 
-    // Emissive Intensity is only use here, but is part of BuiltinData to enforce UI parameters as we want the users to fill one color and one intensity
-    builtinData.emissiveIntensity = _EmissiveIntensity; // We still store intensity here so we can reuse it with debug code
-
-    builtinData.emissiveColor = _EmissiveColor * builtinData.emissiveIntensity * lerp(float3(1.0, 1.0, 1.0), surfaceData.baseColor.rgb, _AlbedoAffectEmissive);
+    builtinData.emissiveColor = _EmissiveColor * lerp(float3(1.0, 1.0, 1.0), surfaceData.baseColor.rgb, _AlbedoAffectEmissive);
 #ifdef _EMISSIVE_COLOR_MAP
 
     // Use layer0 of LayerTexCoord to retrieve emissive color mapping information

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/LitProperties.hlsl

 float _PPDLodThreshold;
 
 float3 _EmissiveColor;
-float _EmissiveIntensity;
 float _AlbedoAffectEmissive;
 
 float _EnableSpecularOcclusion;

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/LitTessellation.shader

         // These option below will cause different compilation flag.
         [ToggleUI]  _EnableSpecularOcclusion("Enable specular occlusion", Float) = 0.0
 
-        _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
+        [HDR] _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
-        _EmissiveIntensity("EmissiveIntensity", Float) = 0
         [ToggleUI] _AlbedoAffectEmissive("Albedo Affect Emissive", Float) = 0.0
 
         _DistortionVectorMap("DistortionVectorMap", 2D) = "black" {}

com.unity.render-pipelines.high-definition/HDRP/Material/StackLit/StackLit.shader

         _EmissiveColorMap("Emissive Color Map", 2D) = "white" {}
         _EmissiveColorMapUV("Emissive Color Map UV", Range(0.0, 1.0)) = 0
         _EmissiveColorMapUVLocal("Emissive Color Map UV Local", Float) = 0.0
-        _EmissiveIntensity("Emissive Intensity", Float) = 0
         [ToggleUI] _AlbedoAffectEmissive("Albedo Affect Emissive", Float) = 0.0
 
         [ToggleUI] _EnableSubsurfaceScattering("Enable Subsurface Scattering", Float) = 0.0

com.unity.render-pipelines.high-definition/HDRP/Material/StackLit/StackLitData.hlsl

         builtinData.bakeDiffuseLighting += SampleBakedGI(input.positionWS, -input.worldToTangent[2], input.texCoord1, input.texCoord2) * bsdfData.transmittance;
     }
 
-    // Emissive Intensity is only use here, but is part of BuiltinData to enforce UI parameters as we want the users to fill one color and one intensity
-    builtinData.emissiveIntensity = _EmissiveIntensity; // We still store intensity here so we can reuse it with debug code
-    builtinData.emissiveColor = _EmissiveColor * builtinData.emissiveIntensity * lerp(float3(1.0, 1.0, 1.0), surfaceData.baseColor.rgb, _AlbedoAffectEmissive);
+    builtinData.emissiveColor = _EmissiveColor * lerp(float3(1.0, 1.0, 1.0), surfaceData.baseColor.rgb, _AlbedoAffectEmissive);
     builtinData.emissiveColor *= SAMPLE_TEXTURE2D_SCALE_BIAS(_EmissiveColorMap).rgb;
 
     // TODO:

com.unity.render-pipelines.high-definition/HDRP/Material/StackLit/StackLitProperties.hlsl

 float4 _EmissiveColorMap_MipInfo;
 float _EmissiveColorMapUV;
 float _EmissiveColorMapUVLocal;
-float _EmissiveIntensity;
 float _AlbedoAffectEmissive;
 
 float _GeometricNormalFilteringEnabled;

com.unity.render-pipelines.high-definition/HDRP/Material/Unlit/Unlit.shader

         _UnlitColor("Color", Color) = (1,1,1,1)
         _UnlitColorMap("ColorMap", 2D) = "white" {}
 
-        _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
+        [HDR] _EmissiveColor("EmissiveColor", Color) = (1, 1, 1)
-        _EmissiveIntensity("EmissiveIntensity", Float) = 0
 
         _DistortionVectorMap("DistortionVectorMap", 2D) = "black" {}
         [ToggleUI] _DistortionEnable("Enable Distortion", Float) = 0.0

com.unity.render-pipelines.high-definition/HDRP/Material/Unlit/UnlitData.hlsl

 
     builtinData.bakeDiffuseLighting = float3(0.0, 0.0, 0.0);
 
-    // Emissive Intensity is only use here, but is part of BuiltinData to enforce UI parameters as we want the users to fill one color and one intensity
-    builtinData.emissiveIntensity = _EmissiveIntensity;
-
-    builtinData.emissiveColor = SAMPLE_TEXTURE2D(_EmissiveColorMap, sampler_EmissiveColorMap, TRANSFORM_TEX(input.texCoord0, _EmissiveColorMap)).rgb * _EmissiveColor * builtinData.emissiveIntensity;
+    builtinData.emissiveColor = SAMPLE_TEXTURE2D(_EmissiveColorMap, sampler_EmissiveColorMap, TRANSFORM_TEX(input.texCoord0, _EmissiveColorMap)).rgb * _EmissiveColor;
-    builtinData.emissiveColor = _EmissiveColor * builtinData.emissiveIntensity;
+    builtinData.emissiveColor = _EmissiveColor;
 #endif
 
     builtinData.velocity = float2(0.0, 0.0);

com.unity.render-pipelines.high-definition/HDRP/Material/Unlit/UnlitProperties.hlsl

 float3 _EmissiveColor;
 float4 _EmissiveColorMap_ST;
 
-float _EmissiveIntensity;
-
 float _AlphaCutoff;
 float _DistortionScale;
 float _DistortionVectorScale;