Merge pull request #1503 from Unity-Technologies/VisualizeShadowMasks

Visualize shadow masks

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

 - Add support for mesh decals
 - Add flag to disable projector decals on transparent geometry to save performance and decal texture atlas space
 - Add ability to use decal diffuse map as mask only
+- Add visualize all shadow masks in lighting debug
 
 ### Improvements
 

com.unity.render-pipelines.high-definition/HDRP/Debug/LightingDebug.cs

         SpecularLighting,
         LuxMeter,
         VisualizeCascade,
+        VisualizeShadowMasks,
         IndirectDiffuseOcclusion,
         IndirectSpecularOcclusion,
         ScreenSpaceTracingRefraction,

com.unity.render-pipelines.high-definition/HDRP/Debug/LightingDebug.cs.hlsl

 #define DEBUGLIGHTINGMODE_SPECULAR_LIGHTING (2)
 #define DEBUGLIGHTINGMODE_LUX_METER (3)
 #define DEBUGLIGHTINGMODE_VISUALIZE_CASCADE (4)
-#define DEBUGLIGHTINGMODE_INDIRECT_DIFFUSE_OCCLUSION (5)
-#define DEBUGLIGHTINGMODE_INDIRECT_SPECULAR_OCCLUSION (6)
-#define DEBUGLIGHTINGMODE_SCREEN_SPACE_TRACING_REFRACTION (7)
-#define DEBUGLIGHTINGMODE_SCREEN_SPACE_TRACING_REFLECTION (8)
+#define DEBUGLIGHTINGMODE_VISUALIZE_SHADOW_MASKS (5)
+#define DEBUGLIGHTINGMODE_INDIRECT_DIFFUSE_OCCLUSION (6)
+#define DEBUGLIGHTINGMODE_INDIRECT_SPECULAR_OCCLUSION (7)
+#define DEBUGLIGHTINGMODE_SCREEN_SPACE_TRACING_REFRACTION (8)
+#define DEBUGLIGHTINGMODE_SCREEN_SPACE_TRACING_REFLECTION (9)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.DebugScreenSpaceTracing:  static fields

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

             if (_DebugLightingSubMode != DEBUGSCREENSPACETRACING_COLOR)
                 diffuseLighting = lighting.indirect.specularReflected;
             break;
+        case DEBUGLIGHTINGMODE_VISUALIZE_SHADOW_MASKS:
+            #ifdef SHADOWS_SHADOWMASK
+            diffuseLighting = float3(
+                bakeLightingData.bakeShadowMask.r / 2 + bakeLightingData.bakeShadowMask.g / 2,
+                bakeLightingData.bakeShadowMask.g / 2 + bakeLightingData.bakeShadowMask.b / 2,
+                bakeLightingData.bakeShadowMask.b / 2 + bakeLightingData.bakeShadowMask.a / 2
+            );
+            specularLighting = float3(0, 0, 0);
+            #endif
+            break ;
         }
     }
     else if (_DebugMipMapMode != DEBUGMIPMAPMODE_NONE)