From b95e897c48947688e5b0c9ad4f63ab9ed4143512 Mon Sep 17 00:00:00 2001
From: FrancescoC-Unity <francescoc@unity3d.com>
Date: Tue, 2 Nov 2021 13:51:06 +0100
Subject: [PATCH] Don't blur if nothing to blur (saves memory due to RG)

---
 .../Runtime/Lighting/Shadow/HDShadowAtlas.cs                 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowAtlas.cs b/com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowAtlas.cs
index 7f8b413778d..8332db2b832 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowAtlas.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/Lighting/Shadow/HDShadowAtlas.cs
@@ -566,6 +566,11 @@ TextureHandle IMBlurMoment(RenderGraph renderGraph, TextureHandle atlasTexture)
 
         internal TextureHandle BlurShadows(RenderGraph renderGraph)
         {
+            if (m_ShadowRequests.Count == 0)
+            {
+                return renderGraph.defaultResources.whiteTexture;
+            }
+
             if (m_BlurAlgorithm == BlurAlgorithm.EVSM)
             {
                 return EVSMBlurMoments(renderGraph, m_ShadowMapOutput);