Wire URP render pass finish callback

managed/XCEngine.RenderPipelines.Universal/Rendering/Universal/ScriptableRenderer.cs

@@ -12,6 +12,8 @@ namespace XCEngine.Rendering.Universal
             new List<ScriptableRenderPass>();
         private readonly RendererBlocks m_rendererBlocks =
             new RendererBlocks();
+        private readonly CommandBuffer m_finishCameraStackCommandBuffer =
+            new CommandBuffer("ScriptableRenderer.FinishCameraStack");
         private bool m_isBuildingPassQueue;
         private CameraFrameStage m_passQueueStage =
             CameraFrameStage.MainScene;
@@ -164,7 +166,14 @@ namespace XCEngine.Rendering.Universal
             RenderingData renderingData =
                 context.renderingData;
             BuildPassQueue(renderingData);
-            return RecordRendererStage(context);
+            bool recorded =
+                RecordRendererStage(context);
+            if (recorded)
+            {
+                FinishCameraStackRendering();
+            }
+
+            return recorded;
         }
 
         protected internal virtual bool SupportsStageRenderGraph(
@@ -383,6 +392,22 @@ namespace XCEngine.Rendering.Universal
             }
         }
 
+        private void FinishCameraStackRendering()
+        {
+            for (int i = 0; i < m_activePassQueue.Count; ++i)
+            {
+                ScriptableRenderPass renderPass =
+                    m_activePassQueue[i];
+                if (renderPass == null)
+                {
+                    continue;
+                }
+
+                renderPass.OnFinishCameraStackRendering(
+                    m_finishCameraStackCommandBuffer);
+            }
+        }
+
         protected virtual void ReleaseRuntimeResources()
         {
         }