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Fix directional lights shadows jittering when using TAA

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This commit is contained in:
Wojtek Figat
2024-08-08 14:05:57 +02:00
parent 788d719f2a
commit ca62a6c4bf
1 changed files with 15 additions and 4 deletions
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19
Source/Engine/Renderer/ShadowsPass.cpp
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@@ -859,6 +859,18 @@ void ShadowsPass::SetupLight(ShadowsCustomBuffer& shadows, RenderContext& render
renderContextBatch.Contexts.AddDefault(atlasLight.ContextCount); renderContextBatch.Contexts.AddDefault(atlasLight.ContextCount);
atlasLight.Cache.Set(renderContext.View, light, atlasLight.CascadeSplits); atlasLight.Cache.Set(renderContext.View, light, atlasLight.CascadeSplits);
// Calculate view frustum corners (un-jittered) in view-space
Float3 frustumCorners[8];
{
BoundingFrustum stableViewFrustum;
Matrix m;
Matrix::Multiply(renderContext.View.View, renderContext.View.NonJitteredProjection, m);
stableViewFrustum.SetMatrix(m);
stableViewFrustum.GetCorners(frustumCorners);
}
for (int32 i = 0; i < 8; i++)
Float3::Transform(frustumCorners[i], renderContext.View.View, frustumCorners[i]);
// Create the different view and projection matrices for each split // Create the different view and projection matrices for each split
float splitMinRatio = 0; float splitMinRatio = 0;
float splitMaxRatio = (minDistance - view.Near) / viewRange; float splitMaxRatio = (minDistance - view.Near) / viewRange;
@@ -878,10 +890,9 @@ void ShadowsPass::SetupLight(ShadowsCustomBuffer& shadows, RenderContext& render
for (int32 j = 0; j < 4; j++) for (int32 j = 0; j < 4; j++)
{ {
float overlapWithPrevSplit = 0.1f * (splitMinRatio - oldSplitMinRatio); // CSM blending overlap float overlapWithPrevSplit = 0.1f * (splitMinRatio - oldSplitMinRatio); // CSM blending overlap
const RenderList* mainCache = renderContext.List; const auto frustumRangeVS = frustumCorners[j + 4] - frustumCorners[j];
const auto frustumRangeVS = mainCache->FrustumCornersVs[j + 4] - mainCache->FrustumCornersVs[j]; frustumCornersVs[j] = frustumCorners[j] + frustumRangeVS * (splitMinRatio - overlapWithPrevSplit);
frustumCornersVs[j] = mainCache->FrustumCornersVs[j] + frustumRangeVS * (splitMinRatio - overlapWithPrevSplit); frustumCornersVs[j + 4] = frustumCorners[j] + frustumRangeVS * splitMaxRatio;
frustumCornersVs[j + 4] = mainCache->FrustumCornersVs[j] + frustumRangeVS * splitMaxRatio;
} }
// Transform the frustum from camera view space to world-space // Transform the frustum from camera view space to world-space