Added a custom effect injection point right before upscaling & TAA, to be rendered at the lower internal rendering resolution.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/PostProcessEvent.cs

@@ -9,20 +9,29 @@ namespace UnityEngine.Rendering.PostProcessing
     {
         /// <summary>
         /// Effects at this injection points will execute before transparent objects are rendered.
+        /// These effects will be rendered at the internal render resolution.
         /// </summary>
         BeforeTransparent = 0,
 
+        /// <summary>
+        /// Effects at this injection point will execute before upscaling and temporal anti-aliasing.
+        /// These effects will be rendered at the internal render resolution.
+        /// </summary>
+        BeforeUpscaling = 1,
+        
         /// <summary>
         /// Effects at this injection points will execute after temporal anti-aliasing and before
         /// builtin effects are rendered.
+        /// These effects will be rendered at the display resolution.
         /// </summary>
-        BeforeStack = 1,
+        BeforeStack = 2,
 
         /// <summary>
         /// Effects at this injection points will execute after builtin effects have been rendered
         /// and before the final pass that does FXAA and applies dithering.
+        /// These effects will be rendered at the display resolution.
         /// </summary>
-        AfterStack = 2,
+        AfterStack = 3,
     }
 
     // Box free comparer for our `PostProcessEvent` enum, else the runtime will box the type when

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/PostProcessLayer.cs

@@ -173,6 +173,9 @@ namespace UnityEngine.Rendering.PostProcessing
         [SerializeField]
         List<SerializedBundleRef> m_BeforeTransparentBundles;
 
+        [SerializeField] 
+        List<SerializedBundleRef> m_BeforeUpscalingBundles;
+
         [SerializeField]
         List<SerializedBundleRef> m_BeforeStackBundles;
 
@@ -314,6 +317,7 @@ namespace UnityEngine.Rendering.PostProcessing
 
             // Create these lists only once, the serialization system will take over after that
             RuntimeUtilities.CreateIfNull(ref m_BeforeTransparentBundles);
+            RuntimeUtilities.CreateIfNull(ref m_BeforeUpscalingBundles);
             RuntimeUtilities.CreateIfNull(ref m_BeforeStackBundles);
             RuntimeUtilities.CreateIfNull(ref m_AfterStackBundles);
 
@@ -329,6 +333,7 @@ namespace UnityEngine.Rendering.PostProcessing
 
             // Update sorted lists with newly added or removed effects in the assemblies
             UpdateBundleSortList(m_BeforeTransparentBundles, PostProcessEvent.BeforeTransparent);
+            UpdateBundleSortList(m_BeforeUpscalingBundles, PostProcessEvent.BeforeUpscaling);
             UpdateBundleSortList(m_BeforeStackBundles, PostProcessEvent.BeforeStack);
             UpdateBundleSortList(m_AfterStackBundles, PostProcessEvent.AfterStack);
 
@@ -336,6 +341,7 @@ namespace UnityEngine.Rendering.PostProcessing
             sortedBundles = new Dictionary<PostProcessEvent, List<SerializedBundleRef>>(new PostProcessEventComparer())
             {
                 { PostProcessEvent.BeforeTransparent, m_BeforeTransparentBundles },
+                { PostProcessEvent.BeforeUpscaling,   m_BeforeUpscalingBundles },
                 { PostProcessEvent.BeforeStack,       m_BeforeStackBundles },
                 { PostProcessEvent.AfterStack,        m_AfterStackBundles }
             };
@@ -1055,6 +1061,10 @@ namespace UnityEngine.Rendering.PostProcessing
                     }
                     context.source = lastTarget;
                 }
+                
+                // Right before upscaling & temporal anti-aliasing
+                if (HasActiveEffects(PostProcessEvent.BeforeUpscaling, context))
+                    lastTarget = RenderInjectionPoint(PostProcessEvent.BeforeUpscaling, context, "BeforeUpscaling", lastTarget);
 
                 // Do temporal anti-aliasing first
                 if (context.IsTemporalAntialiasingActive())