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Fix issue with Uber Post process shader when alpha is enabled #422

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Merged
merged 3 commits into from
May 12, 2020
Merged

Fix issue with Uber Post process shader when alpha is enabled #422

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9880f1a
Fix issue with alpha being over 1 hence, leading to the final color b…
FrancescoC-unity May 12, 2020
04f445e
Changelog
FrancescoC-unity May 12, 2020
3a9fe8e
Merge branch 'HDRP/staging' into HDRP/issue-with-pp-alpha
sebastienlagarde May 12, 2020
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1 change: 1 addition & 0 deletions com.unity.render-pipelines.high-definition/CHANGELOG.md
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Expand Up @@ -583,6 +583,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
- Fixed issue with reflection probes in realtime time mode with OnEnable baking having wrong lighting with sky set to dynamic (case 1238047).
- Fixed transparent motion vectors not working when in MSAA.
- Fix error when removing DecalProjector from component contextual menu (case 1243960)
- Fixed issue with post process when running in RGBA16 and an object with additive blending is in the scene.

### Changed
- Improve MIP selection for decals on Transparents
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3 changes: 2 additions & 1 deletion com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/UberPost.compute
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Expand Up @@ -218,7 +218,8 @@ void Uber(uint3 dispatchThreadId : SV_DispatchThreadID)
// Alpha mask
#ifdef ENABLE_ALPHA
// Post processing is not applied on pixels with zero alpha
color.xyz = lerp(inputColor.xyz, color.xyz, inputColor.a);
// Saturate is necessary to avoid issues when additive blending pushes the alpha over 1.
color.xyz = lerp(inputColor.xyz, color.xyz, saturate(inputColor.a));
#endif

// Done
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