Fixed potential asymmetrical resource release in the volumetric clouds (case 1388218). (#6600)

Author: anisunity

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

@@ -74,6 +74,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed compilation issue related to shader stripping in ray tracing.
 - Fixed flipped UV for directional light cookie on PBR Sky (case 1382656).
 - Fixing missing doc API for RTAS Debug display.
+- Fixed AO dissapearing when DRS would be turned off through a camera, while hardware drs is active in DX12 or Vulkan (case 1383093).
+- Fixed misc shader warnings.
+- Fixed a shader warning in UnityInstancing.hlsl
+- Fixed for APV debug mode breaking rendering when switching to an asset with APV disabled.
+- Fixed potential asymmetrical resource release in the volumetric clouds (case 1388218).
 - Fixed the fade in mode of the clouds not impacting the volumetric clouds shadows (case 1381652).
 
 ### Changed

com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricClouds.cs

@@ -31,6 +31,7 @@ public partial class HDRenderPipeline
         int m_CombineCloudsKernelColorCopy;
         int m_CombineCloudsKernelColorRW;
         int m_CombineCloudsSkyKernel;
+        bool m_ActiveVolumetricClouds;
 
         // Combine pass via hardware blending, used in case of MSAA color target.
         Material m_CloudCombinePass;
@@ -52,7 +53,9 @@ struct VolumetricCloudsCameraData
 
         void InitializeVolumetricClouds()
         {
-            if (!m_Asset.currentPlatformRenderPipelineSettings.supportVolumetricClouds)
+            // Keep track of the state for the release
+            m_ActiveVolumetricClouds = m_Asset.currentPlatformRenderPipelineSettings.supportVolumetricClouds;
+            if (!m_ActiveVolumetricClouds)
                 return;
 
             // Allocate the buffers for ambient probe evaluation
@@ -89,7 +92,7 @@ void InitializeVolumetricClouds()
 
         void ReleaseVolumetricClouds()
         {
-            if (!m_Asset.currentPlatformRenderPipelineSettings.supportVolumetricClouds)
+            if (!m_ActiveVolumetricClouds)
                 return;
 
             // Destroy the material