[Backport 8.x.x] Add defines guards around shadows hlsl files

com.unity.render-pipelines.core/ShaderLibrary/Shadow/ShadowSamplingTent.hlsl

@@ -1,3 +1,5 @@
+#ifndef SHADOW_SAMPLING_TENT_INCLUDED
+#define SHADOW_SAMPLING_TENT_INCLUDED
 // ------------------------------------------------------------------
 //  PCF Filtering Tent Functions
 // ------------------------------------------------------------------
@@ -242,3 +244,4 @@ void SampleShadow_ComputeSamples_Tent_7x7(real4 shadowMapTexture_TexelSize, real
     fetchesWeights[14] = fetchesWeightsU.z * fetchesWeightsV.w;
     fetchesWeights[15] = fetchesWeightsU.w * fetchesWeightsV.w;
 }
+#endif

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

@@ -29,6 +29,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed an issue where editing the Look Dev default profile would not reflect directly in the Look Dev window.
 - Fixed an issue where manipulating the color wheels in a volume component would reset the cursor every time.
 - Fixed an issue where static sky lighting would not be updated for a new scene until it's reloaded at least once.
+- Fixed missing include guards in shadow hlsl files.
+
+
 
 ### Changed
 - Shadowmask and realtime reflection probe property are hide in Quality settings

com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowAlgorithms.hlsl

@@ -1,3 +1,6 @@
+#ifndef HD_SHADOW_ALGORITHMS_INCLUDED
+#define HD_SHADOW_ALGORITHMS_INCLUDED
+
 // Various shadow algorithms
 // There are two variants provided, one takes the texture and sampler explicitly so they can be statically passed in.
 // The variant without resource parameters dynamically accesses the texture when sampling.
@@ -341,3 +344,4 @@ float EvalShadow_SampleClosestDistance_Punctual(HDShadowData sd, Texture2D tex,
 
     return distance(occluderPosWS, lightPositionWS);
 }
+#endif

com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowSampling.hlsl

@@ -1,3 +1,5 @@
+#ifndef HD_SHADOW_SAMPLING_INCLUDED
+#define HD_SHADOW_SAMPLING_INCLUDED
 // Various shadow sampling logic.
 // Again two versions, one for dynamic resource indexing, one for static resource access.
 
@@ -328,3 +330,4 @@ float SampleShadow_PCSS(float3 tcs, float2 posSS, float2 scale, float2 offset, f
 //  shadowData.shadowFilterParams0.z = shadowRequest.maxDepthBias;
 
 // #include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDIMS.hlsl"
+#endif

com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/ShadowMoments.hlsl

@@ -1,3 +1,5 @@
+#ifndef SHADOW_MOMENTS_INCLUDED
+#define SHADOW_MOMENTS_INCLUDED
 // Library header containing various useful functions for doing moment based shadow maps.
 // Supported flavors are VSM, EVSM and MSM
 
@@ -131,3 +133,4 @@ float ShadowMoments_SolveDelta4MSM( float3 z, float4 b, float lightLeakBias)
 
     return saturate( ((1.0 - attenuation) - lightLeakBias) / (1.0 - lightLeakBias) );
 }
+#endif