Rotate between PSSR contexts to further reduce risk of race conditions between destroy & create

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/PSSRUpscaler.cs

@@ -10,6 +10,7 @@ namespace UnityEngine.Rendering.PostProcessing
 		public static bool IsSupported => UnityEngine.PS5.Utility.isTrinityMode && PluginInitialized;
 		
 		private static readonly bool PluginInitialized;
+		private static uint _currentContext;
 
 		private PSSRPlugin.DispatchParams _dispatchParams;
 		private IntPtr _dispatchParamsBuffer;
@@ -32,7 +33,8 @@ namespace UnityEngine.Rendering.PostProcessing
 			}
 			
 			PluginInitialized = true;
-		}	
+			_currentContext = 0;
+		}
 
 		public override void CreateContext(PostProcessRenderContext context, Upscaling config)
 		{
@@ -43,7 +45,7 @@ namespace UnityEngine.Rendering.PostProcessing
 			}
 
 			PSSRPlugin.InitParams initParams;
-			initParams.contextIndex = 0;
+			initParams.contextIndex = _currentContext;
 			initParams.displayWidth = (uint)config.UpscaleSize.x;
 			initParams.displayHeight = (uint)config.UpscaleSize.y;
 			initParams.maxRenderWidth = (uint)config.MaxRenderSize.x;
@@ -71,8 +73,10 @@ namespace UnityEngine.Rendering.PostProcessing
 			
 			if (_contextInitialized)
 			{
-				_dispatchParams.contextIndex = 0;
+				_dispatchParams.contextIndex = _currentContext;
 				Marshal.StructureToPtr(_dispatchParams, _dispatchParamsBuffer, false);
+
+				_currentContext = (_currentContext + 1) % PSSRPlugin.MaxNumContexts;
 				
 				// Destroying the context from the render thread reduces the risk of race conditions causing crashes
 				var cmd = new CommandBuffer();
@@ -139,7 +143,7 @@ namespace UnityEngine.Rendering.PostProcessing
 			if (SystemInfo.usesReversedZBuffer) flags |= PSSRPlugin.OptionFlags.ReverseDepth;
 			if (config.exposureSource == Upscaling.ExposureSource.Auto) flags |= PSSRPlugin.OptionFlags.AutoExposure;
 
-			_dispatchParams.contextIndex = 0;
+			_dispatchParams.contextIndex = _currentContext;
 			_dispatchParams.color = ToNativePtr(_inputColor);
 			_dispatchParams.depth = ToNativePtr(_inputDepth[frameIndex]);
 			_dispatchParams.prevDepth = ToNativePtr(_inputDepth[frameIndex ^ 1]);
@@ -191,6 +195,8 @@ namespace UnityEngine.Rendering.PostProcessing
 
 		private static class PSSRPlugin
 		{
+			public static readonly uint MaxNumContexts = 4;
+			
 			private const string LibraryName = "PSSRPlugin.prx";
 
 			[DllImport(LibraryName)]