Don't blur if nothing to blur (saves memory due to RG) (#6183)

FrancescoC-unity · alelievr · commit ed28ac1b1f3f · 2021-11-04T15:53:16.000+01:00
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
@@ -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);

Original file line number	Diff line number	Diff line change
`@@ -566,6 +566,11 @@ TextureHandle IMBlurMoment(RenderGraph renderGraph, TextureHandle atlasTexture)`
`566`	`566`
`567`	`567`	`internal TextureHandle BlurShadows(RenderGraph renderGraph)`
`568`	`568`	`{`
	`569`	`+ if (m_ShadowRequests.Count == 0)`
	`570`	`+ {`
	`571`	`+ return renderGraph.defaultResources.whiteTexture;`
	`572`	`+ }`
	`573`	`+`
`569`	`574`	`if (m_BlurAlgorithm == BlurAlgorithm.EVSM)`
`570`	`575`	`{`
`571`	`576`	`return EVSMBlurMoments(renderGraph, m_ShadowMapOutput);`