HDRenderPipeline: Add debug mode for SSAO/GTAO

ScriptableRenderPipeline/HDRenderPipeline/Debug/DebugDisplay.cs

         None,
         DiffuseLighting,
         SpecularLighting,
-        VisualizeCascade
+        VisualizeCascade,
+        IndirectDiffuseOcclusionFromSsao,
+        IndirectDiffuseGtaoFromSsao,
+        IndirectSpecularOcclusionFromSsao,
+        IndirectSpecularGtaoFromSsao   
     }
 
     public class DebugDisplaySettings

ScriptableRenderPipeline/HDRenderPipeline/Debug/DebugDisplay.cs.hlsl

 #define DEBUGLIGHTINGMODE_DIFFUSE_LIGHTING (1)
 #define DEBUGLIGHTINGMODE_SPECULAR_LIGHTING (2)
 #define DEBUGLIGHTINGMODE_VISUALIZE_CASCADE (3)
+#define DEBUGLIGHTINGMODE_INDIRECT_DIFFUSE_OCCLUSION_FROM_SSAO (4)
+#define DEBUGLIGHTINGMODE_INDIRECT_DIFFUSE_GTAO_FROM_SSAO (5)
+#define DEBUGLIGHTINGMODE_INDIRECT_SPECULAR_OCCLUSION_FROM_SSAO (6)
+#define DEBUGLIGHTINGMODE_INDIRECT_SPECULAR_GTAO_FROM_SSAO (7)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.Attributes.DebugViewVarying:  static fields

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

     diffuseLighting = lerp(directDiffuseLighting + bakeDiffuseLighting, accLighting.envDiffuseLighting, accLighting.envDiffuseLightingWeight);
     specularLighting = accLighting.dirSpecularLighting + accLighting.punctualSpecularLighting + accLighting.areaSpecularLighting + accLighting.envSpecularLighting;
     specularLighting *= 1 + bsdfData.fresnel0 * preLightData.energyCompensation;
+
+#ifdef DEBUG_DISPLAY
+    if (_DebugLightingMode == DEBUGLIGHTINGMODE_INDIRECT_DIFFUSE_OCCLUSION_FROM_SSAO)
+    {
+        diffuseLighting = indirectAmbientOcclusion;
+        specularLighting = float3(0.0, 0.0, 0.0); // Disable specular lighting
+    }
+    else if (_DebugLightingMode == DEBUGLIGHTINGMODE_INDIRECT_SPECULAR_OCCLUSION_FROM_SSAO)
+    {
+        diffuseLighting = GetSpecularOcclusionFromAmbientOcclusion(preLightData.NdotV, indirectAmbientOcclusion, bsdfData.roughness);
+        specularLighting = float3(0.0, 0.0, 0.0); // Disable specular lighting
+    }
+    #if GTAO_MULTIBOUNCE_APPROX
+    else if (_DebugLightingMode == DEBUGLIGHTINGMODE_INDIRECT_DIFFUSE_GTAO_FROM_SSAO)
+    {
+        diffuseLighting = GTAOMultiBounce(indirectAmbientOcclusion, bsdfData.diffuseColor);
+        specularLighting = float3(0.0, 0.0, 0.0); // Disable specular lighting
+    }
+    else if (_DebugLightingMode == DEBUGLIGHTINGMODE_INDIRECT_SPECULAR_GTAO_FROM_SSAO)
+    {
+        diffuseLighting = GTAOMultiBounce(specularOcclusion, bsdfData.fresnel0);
+        specularLighting = float3(0.0, 0.0, 0.0); // Disable specular lighting
+    }
+    #endif
+#endif
 }
 
 

ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/AtmosphericScattering.cs.hlsl

 //
-// This file was automatically generated from Assets/ScriptableRenderLoop/ScriptableRenderPipeline/HDRenderPipeline/Sky/AtmosphericScattering/AtmosphericScattering.cs.  Please don't edit by hand.
+// This file was automatically generated. Please don't edit by hand.
 //
 
 #ifndef ATMOSPHERICSCATTERING_CS_HLSL