[HDRP] Fix error in Depth Of Field near radius blur calculation

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

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed issue with compositor related custom passes still active after disabling the compositor (case 1305330)
 - Fixed some render texture leaks.
 - Fixed regression in Wizard that not fix runtime ressource anymore (case 1287627)
+- Fixed error in Depth Of Field near radius blur calculation (case 1306228).
 
 ### Changed
 - Change the source value for the ray tracing frame index iterator from m_FrameCount to the camera frame count (case 1301356).

com.unity.render-pipelines.high-definition/Runtime/PostProcessing/PostProcessSystem.RenderGraph.cs

@@ -507,7 +507,10 @@ TextureHandle DepthOfFieldPass(RenderGraph renderGraph, HDCamera hdCamera, Textu
                         passData.fullresCoC = builder.CreateTransientTexture(new TextureDesc(Vector2.one, true, true)
                             { colorFormat = k_CoCFormat, enableRandomWrite = true, name = "Full res CoC" });
 
-                        int passCount = Mathf.CeilToInt((passData.parameters.nearMaxBlur + 2f) / 4f);
+                        GetDoFResolutionScale(passData.parameters, out float unused, out float resolutionScale);
+                        float actualNearMaxBlur = passData.parameters.nearMaxBlur * resolutionScale;
+                        int passCount = Mathf.CeilToInt((actualNearMaxBlur + 2f) / 4f);
+
                         passData.dilationPingPongRT = TextureHandle.nullHandle;
                         if (passCount > 1)
                         {

com.unity.render-pipelines.high-definition/Runtime/PostProcessing/PostProcessSystem.cs

@@ -1498,6 +1498,12 @@ DepthOfFieldParameters PrepareDoFParameters(HDCamera camera)
             return parameters;
         }
 
+        static void GetDoFResolutionScale(in DepthOfFieldParameters dofParameters, out float scale, out float resolutionScale)
+        {
+            scale = 1f / (float)dofParameters.resolution;
+            resolutionScale = (dofParameters.camera.actualHeight / 1080f) * (scale * 2f);
+        }
+
         //
         // Reference used:
         //   "A Lens and Aperture Camera Model for Synthetic Image Generation" [Potmesil81]
@@ -1551,14 +1557,13 @@ static void DoDepthOfField(in DepthOfFieldParameters dofParameters, CommandBuffe
             float anamorphism = dofParameters.physicalCameraAnamorphism / 4f;
             float barrelClipping = dofParameters.physicalCameraBarrelClipping / 3f;
 
-            float scale = 1f / (float)dofParameters.resolution;
+            GetDoFResolutionScale(dofParameters, out float scale, out float resolutionScale);
             var screenScale = new Vector2(scale, scale);
             int targetWidth = Mathf.RoundToInt(dofParameters.camera.actualWidth * scale);
             int targetHeight = Mathf.RoundToInt(dofParameters.camera.actualHeight * scale);
 
             cmd.SetGlobalVector(HDShaderIDs._TargetScale, new Vector4((float)dofParameters.resolution, scale, 0f, 0f));
 
-            float resolutionScale = (dofParameters.camera.actualHeight / 1080f) * (scale * 2f);
             int farSamples = dofParameters.farSampleCount;
             int nearSamples = dofParameters.nearSampleCount;