Fixed VR postfx rendering.

com.unity.render-pipelines.lightweight/LWRP/LightweightPipeline.cs

             }
         }
 
-        public static void RenderPostProcess(CommandBuffer cmd, PostProcessRenderContext context, ref CameraData cameraData, RenderTextureFormat colorFormat, RenderTargetIdentifier source, RenderTargetIdentifier dest, bool opaqueOnly)
-        {
-            context.Reset();
-            context.camera = cameraData.camera;
-            context.source = source;
-            context.sourceFormat = colorFormat;
-            context.destination = dest;
-            context.command = cmd;
-            context.flip = cameraData.camera.targetTexture == null;
-
-            if (opaqueOnly)
-                cameraData.postProcessLayer.RenderOpaqueOnly(context);
-            else
-                cameraData.postProcessLayer.Render(context);
-        }
-
         void SetSupportedRenderingFeatures()
         {
 #if UNITY_EDITOR
 
             cameraData.postProcessLayer = camera.GetComponent<PostProcessLayer>();
             cameraData.postProcessEnabled = cameraData.postProcessLayer != null && cameraData.postProcessLayer.isActiveAndEnabled;
-
-            // PostProcess for VR is not working atm. Disable it for now.
-            cameraData.postProcessEnabled &= !cameraData.isStereoEnabled;
 
             Rect cameraRect = camera.rect;
             cameraData.isDefaultViewport = (!(Math.Abs(cameraRect.x) > 0.0f || Math.Abs(cameraRect.y) > 0.0f ||
             float cameraWidth = (float)cameraData.camera.pixelWidth * cameraData.renderScale;
             float cameraHeight = (float)cameraData.camera.pixelWidth * cameraData.renderScale;
             Shader.SetGlobalVector(PerCameraBuffer._ScaledScreenParams, new Vector4(cameraWidth, cameraHeight, 1.0f + 1.0f / cameraWidth, 1.0f + 1.0f / cameraHeight));
-        }
-
-        bool IsStereoEnabled(Camera camera)
-        {
-#if !UNITY_SWITCH
-            bool isSceneViewCamera = camera.cameraType == CameraType.SceneView;
-            return XRSettings.isDeviceActive && !isSceneViewCamera && (camera.stereoTargetEye == StereoTargetEyeMask.Both);
-#else
-            return false;
-#endif
         }
     }
 }

com.unity.render-pipelines.lightweight/LWRP/LightweightPipelineCore.cs

 using System.Collections.Generic;
 using UnityEngine.Rendering;
 using UnityEngine.Rendering.PostProcessing;
+using UnityEngine.XR;
 
 namespace UnityEngine.Experimental.Rendering.LightweightPipeline
 {
         public static bool IsSupportedCookieType(LightType lightType)
         {
             return lightType == LightType.Directional || lightType == LightType.Spot;
+        }
+
+        public static bool IsStereoEnabled(Camera camera)
+        {
+#if !UNITY_SWITCH
+            bool isSceneViewCamera = camera.cameraType == CameraType.SceneView;
+            return XRSettings.isDeviceActive && !isSceneViewCamera && (camera.stereoTargetEye == StereoTargetEyeMask.Both);
+#else
+            return false;
+#endif
+        }
+
+        public static void RenderPostProcess(CommandBuffer cmd, PostProcessRenderContext context, ref CameraData cameraData, RenderTextureFormat colorFormat, RenderTargetIdentifier source, RenderTargetIdentifier dest, bool opaqueOnly)
+        {
+            Camera camera = cameraData.camera;
+            context.Reset();
+            context.camera = camera;
+            context.source = source;
+            context.sourceFormat = colorFormat;
+            context.destination = dest;
+            context.command = cmd;
+            context.flip = !IsStereoEnabled(camera) && camera.targetTexture == null;
+
+            if (opaqueOnly)
+                cameraData.postProcessLayer.RenderOpaqueOnly(context);
+            else
+                cameraData.postProcessLayer.Render(context);
         }
     }
 }