[2022.3][URP] Improvement on downsampled SSAO (UUM-49557)

Backport of #42246. Fixes UUM-49557.
Unity-Technologies · Feb 8, 2024 · 09fd883 · 09fd883
1 parent e9a8649
commit 09fd883
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diff --git a/Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl b/Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl
@@ -4,6 +4,7 @@
 
 TEXTURE2D_X_FLOAT(_CameraDepthTexture);
 SAMPLER(sampler_CameraDepthTexture);
+float4 _CameraDepthTexture_TexelSize;
 
 float SampleSceneDepth(float2 uv)
 {

diff --git a/Packages/com.unity.render-pipelines.universal/ShaderLibrary/SSAO.hlsl b/Packages/com.unity.render-pipelines.universal/ShaderLibrary/SSAO.hlsl
@@ -215,9 +215,14 @@ half3 PickSamplePoint(float2 uv, int sampleIndex, half sampleIndexHalf, half rcp
     return v;
 }
 
+// For Downsampled SSAO we need to adjust the UV coordinates
+// so it hits the center of the pixel inside the depth texture.
+// The texelSize multiplier is 1.0 when DOWNSAMPLE is enabled, otherwise 0.0
+#define ADJUSTED_DEPTH_UV(uv) uv.xy + ((_CameraDepthTexture_TexelSize.xy * 0.5) * (1.0 - (DOWNSAMPLE - 0.5) * 2.0))
+
 float SampleDepth(float2 uv)
 {
-    return SampleSceneDepth(uv.xy);
+    return SampleSceneDepth(ADJUSTED_DEPTH_UV(uv.xy));
 }
 
 float GetLinearEyeDepth(float rawDepth)

diff --git a/...cts/UniversalGraphicsTest_Foundation/Assets/CommonAssets/URPAssets/200_SSAOURPAsset.asset b/...cts/UniversalGraphicsTest_Foundation/Assets/CommonAssets/URPAssets/200_SSAOURPAsset.asset
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diff --git a/...icsTest_Foundation/Assets/Scenes/200_Assets/Renderers/SSAO_DepthRenderer_Downsample.asset b/...icsTest_Foundation/Assets/Scenes/200_Assets/Renderers/SSAO_DepthRenderer_Downsample.asset
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diff --git a/...st_Foundation/Assets/Scenes/200_Assets/Renderers/SSAO_DepthRenderer_Downsample.asset.meta b/...st_Foundation/Assets/Scenes/200_Assets/Renderers/SSAO_DepthRenderer_Downsample.asset.meta
diff --git a/...niversalGraphicsTest_Foundation/Assets/Scenes/200_Assets/Shaders/OutputSSAOTexture.shader b/...niversalGraphicsTest_Foundation/Assets/Scenes/200_Assets/Shaders/OutputSSAOTexture.shader
@@ -1,4 +1,4 @@
-Shader "Hidden/Test/OutputDepthNormalsTexture"
+Shader "Hidden/Test/OutputSSAOTexture"
 {
     SubShader
     {