ran include generator

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

 #define DEBUGVIEW_DECAL_DECALSURFACEDATA_BASE_COLOR (200)
 #define DEBUGVIEW_DECAL_DECALSURFACEDATA_NORMAL (201)
 #define DEBUGVIEW_DECAL_DECALSURFACEDATA_MASK (202)
-#define DEBUGVIEW_DECAL_DECALSURFACEDATA_HTILE_MASK (203)
+#define DEBUGVIEW_DECAL_DECALSURFACEDATA_AOSBLEND (203)
+#define DEBUGVIEW_DECAL_DECALSURFACEDATA_HTILE_MASK (204)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.Decal+DBufferMaterial:  static fields
     float4 baseColor;
     float4 normalWS;
     float4 mask;
-	float2 MAOSBlend;
+    float2 MAOSBlend;
     uint HTileMask;
 };
 
     float4 normalScaleBias;
     float4 maskScaleBias;
     float4 baseColor;
-	float3 blendParams;
+    float3 blendParams;
 };
 
 //
 {
     return value.baseColor;
 }
+float3 GetBlendParams(DecalData value)
+{
+    return value.blendParams;
+}
 
 //
 // Debug functions
             break;
         case DEBUGVIEW_DECAL_DECALSURFACEDATA_MASK:
             result = decalsurfacedata.mask.xyz;
+            break;
+        case DEBUGVIEW_DECAL_DECALSURFACEDATA_AOSBLEND:
+            result = float3(decalsurfacedata.MAOSBlend, 0.0);
             break;
         case DEBUGVIEW_DECAL_DECALSURFACEDATA_HTILE_MASK:
             result = GetIndexColor(decalsurfacedata.HTileMask);