Add [MainColor] and [MainTexture] on property (#939)

Author: sebastienlagarde

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

@@ -6,8 +6,8 @@ Shader "HDRP/Lit"
         // They are use to fill a SurfaceData. With a MaterialGraph this should not exist.
 
         // Reminder. Color here are in linear but the UI (color picker) do the conversion sRGB to linear
-        _BaseColor("BaseColor", Color) = (1,1,1,1)
-        _BaseColorMap("BaseColorMap", 2D) = "white" {}
+        [MainColor] _BaseColor("BaseColor", Color) = (1,1,1,1)
+        [MainTexture] _BaseColorMap("BaseColorMap", 2D) = "white" {}
         [HideInInspector] _BaseColorMap_MipInfo("_BaseColorMap_MipInfo", Vector) = (0, 0, 0, 0)
 
         _Metallic("_Metallic", Range(0.0, 1.0)) = 0

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

@@ -6,8 +6,8 @@ Shader "HDRP/LitTessellation"
         // They are use to fill a SurfaceData. With a MaterialGraph this should not exist.
 
         // Reminder. Color here are in linear but the UI (color picker) do the conversion sRGB to linear
-        _BaseColor("BaseColor", Color) = (1,1,1,1)
-        _BaseColorMap("BaseColorMap", 2D) = "white" {}
+        [MainColor] _BaseColor("BaseColor", Color) = (1,1,1,1)
+        [MainTexture] _BaseColorMap("BaseColorMap", 2D) = "white" {}
         [HideInInspector] _BaseColorMap_MipInfo("_BaseColorMap_MipInfo", Vector) = (0, 0, 0, 0)
 
         _Metallic("_Metallic", Range(0.0, 1.0)) = 0

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

@@ -3,8 +3,8 @@ Shader "HDRP/Unlit"
     Properties
     {
         // Be careful, do not change the name here to _Color. It will conflict with the "fake" parameters (see end of properties) required for GI.
-        _UnlitColor("Color", Color) = (1,1,1,1)
-        _UnlitColorMap("ColorMap", 2D) = "white" {}
+        [MainColor] _UnlitColor("Color", Color) = (1,1,1,1)
+        [MainTexture] _UnlitColorMap("ColorMap", 2D) = "white" {}
 
         [HDR] _EmissiveColor("EmissiveColor", Color) = (0, 0, 0)
         _EmissiveColorMap("EmissiveColorMap", 2D) = "white" {}