[10.x.x HDRP] Fix issue with raytracing resources not properly initialize

com.unity.render-pipelines.high-definition/Editor/BuildProcessors/HDRPPreprocessShaders.cs

@@ -7,6 +7,7 @@
 using UnityEngine.Rendering.HighDefinition;
 using System.Diagnostics;
 using Debug = UnityEngine.Debug;
+using System.Reflection;
 
 namespace UnityEditor.Rendering.HighDefinition
 {
@@ -297,6 +298,11 @@ public void OnProcessComputeShader(ComputeShader shader, string kernelName, ILis
             if (HDRenderPipeline.currentAsset == null)
                 return;
 
+            // Discard any compute shader use for raytracing if none of the RP asset required it
+            ComputeShader unused;
+            if (!ShaderBuildPreprocessor.playerNeedRaytracing && ShaderBuildPreprocessor.computeShaderCache.TryGetValue(shader.GetInstanceID(), out unused))
+                return;
+
             var exportLog = ShaderBuildPreprocessor.hdrpAssets.Count > 0
                 && ShaderBuildPreprocessor.hdrpAssets.Any(hdrpAsset => hdrpAsset.shaderVariantLogLevel != ShaderVariantLogLevel.Disabled);
 
@@ -535,23 +541,73 @@ public void OnProcessShader(Shader shader, ShaderSnippetData snippet, IList<Shad
     class ShaderBuildPreprocessor : IPreprocessBuildWithReport
     {
         private static List<HDRenderPipelineAsset> _hdrpAssets;
+        private static Dictionary<int, ComputeShader> s_ComputeShaderCache;
+        private static bool s_PlayerNeedRaytracing;
 
         public static List<HDRenderPipelineAsset> hdrpAssets
         {
             get
             {
-                if (_hdrpAssets == null || _hdrpAssets.Count == 0) GetAllValidHDRPAssets();
+                if (_hdrpAssets == null || _hdrpAssets.Count == 0)
+                    GetAllValidHDRPAssets();
                 return _hdrpAssets;
             }
         }
 
+        public static Dictionary<int, ComputeShader> computeShaderCache
+        {
+            get
+            {
+                if (s_ComputeShaderCache == null)
+                    BuilRaytracingComputeList();
+                return s_ComputeShaderCache;
+            }
+        }
+
+        public static bool playerNeedRaytracing
+        {
+            get
+            {
+                return s_PlayerNeedRaytracing;
+            }
+        }
+
+        public static void BuilRaytracingComputeList()
+        {
+            if (s_ComputeShaderCache != null)
+                s_ComputeShaderCache.Clear();
+            else
+                s_ComputeShaderCache = new Dictionary<int, ComputeShader>();
+
+            if (HDRenderPipeline.defaultAsset == null)
+                return;
+
+            if (HDRenderPipeline.defaultAsset.renderPipelineRayTracingResources == null)
+                return;
+
+            foreach (var fieldInfo in HDRenderPipeline.defaultAsset.renderPipelineRayTracingResources.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static))
+            {
+                ComputeShader computeshader;
+                computeshader = fieldInfo.GetValue(HDRenderPipeline.defaultAsset.renderPipelineRayTracingResources) as ComputeShader;
+
+                if (computeshader != null)
+                {
+                    s_ComputeShaderCache.Add(computeshader.GetInstanceID(), computeshader);
+                }
+            }
+        }
+
         static void GetAllValidHDRPAssets()
         {
+            s_PlayerNeedRaytracing = false;
+
             if (HDRenderPipeline.currentAsset == null)
                 return;
 
-            if (_hdrpAssets != null) _hdrpAssets.Clear();
-            else _hdrpAssets = new List<HDRenderPipelineAsset>();
+            if (_hdrpAssets != null)
+                _hdrpAssets.Clear();
+            else
+                _hdrpAssets = new List<HDRenderPipelineAsset>();
 
             using (ListPool<HDRenderPipelineAsset>.Get(out var tmpAssets))
             {
@@ -642,6 +698,15 @@ static void GetAllValidHDRPAssets()
                     Debug.LogWarning("There is no HDRP Asset provided in GraphicsSettings. Build time can be extremely long without it.");
                 }
             }
+            else
+            {
+                // Take the opportunity to know if we need raytracing at runtime
+                foreach (var hdrpAsset in _hdrpAssets)
+                {
+                    if (hdrpAsset.currentPlatformRenderPipelineSettings.supportRayTracing)
+                        s_PlayerNeedRaytracing = true;
+                }
+            }
 
             /*
             Debug.Log(string.Format("{0} HDRP assets in build:{1}",

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs

@@ -612,7 +612,20 @@ void UpgradeResourcesInAssetIfNeeded(HDRenderPipelineAsset asset)
             ResourceReloader.ReloadAllNullIn(asset.renderPipelineResources, HDUtils.GetHDRenderPipelinePath());
 #endif
 
-            if (GatherRayTracingSupport(asset.currentPlatformRenderPipelineSettings))
+            bool requiresRayTracingResources = false;
+            // Make sure to include ray-tracing resources if at least one of the defaultAsset or quality levels needs it
+            if (defaultAsset.currentPlatformRenderPipelineSettings.supportRayTracing)
+                requiresRayTracingResources = true;
+
+            int qualityLevelCount = QualitySettings.names.Length;
+            for (int i = 0; i < qualityLevelCount && !requiresRayTracingResources; ++i)
+            {
+                var hdrpAsset = QualitySettings.GetRenderPipelineAssetAt(i) as HDRenderPipelineAsset;
+                if (hdrpAsset != null && hdrpAsset.currentPlatformRenderPipelineSettings.supportRayTracing)
+                    requiresRayTracingResources = true;
+            }
+
+            if (requiresRayTracingResources)
             {
                 if (asset.renderPipelineRayTracingResources == null)
                     asset.renderPipelineRayTracingResources