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Add smooth shadows blending between directional light cascades

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It was deprecated in 1.9 in favor for dithering between cascades. Bing back that option for games that don't use TAA.
This commit is contained in:
Wojtek Figat
2025-03-27 10:48:35 +01:00
parent fa1469514b
commit 98834131f1
8 changed files with 105 additions and 52 deletions
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19
Source/Engine/Renderer/ShadowsPass.cpp
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@@ -24,7 +24,7 @@
#define SHADOWS_MAX_TILES 6
#define SHADOWS_MIN_RESOLUTION 32
#define SHADOWS_MAX_STATIC_ATLAS_CAPACITY_TO_DEFRAG 0.7f
#define SHADOWS_BASE_LIGHT_RESOLUTION(atlasResolution) atlasResolution / MAX_CSM_CASCADES // Allow to store 4 CSM cascades in a single row in all cases
#define SHADOWS_BASE_LIGHT_RESOLUTION(atlasResolution) (atlasResolution / MAX_CSM_CASCADES) // Allow to store 4 CSM cascades in a single row in all cases
#define NormalOffsetScaleTweak METERS_TO_UNITS(1)
#define LocalLightNearPlane METERS_TO_UNITS(0.1f)
@@ -190,6 +190,7 @@ struct ShadowAtlasLight
uint8 TilesNeeded;
uint8 TilesCount;
bool HasStaticShadowContext;
bool BlendCSM;
mutable StaticStates StaticState;
BoundingSphere Bounds;
float Sharpness, Fade, NormalOffsetScale, Bias, FadeDistance, Distance, TileBorder;
@@ -769,6 +770,15 @@ void ShadowsPass::SetupLight(ShadowsCustomBuffer& shadows, RenderContext& render
const RenderView& view = renderContext.View;
const int32 csmCount = atlasLight.TilesCount;
const auto shadowMapsSize = (float)atlasLight.Resolution;
atlasLight.BlendCSM = Graphics::AllowCSMBlending;
#if USE_EDITOR
// Disable cascades blending when baking lightmaps
if (IsRunningRadiancePass)
atlasLight.BlendCSM = false;
#elif PLATFORM_SWITCH || PLATFORM_IOS || PLATFORM_ANDROID
// Disable cascades blending on low-end platforms
atlasLight.BlendCSM = false;
#endif
// Calculate cascade splits
const float minDistance = view.Near;
@@ -895,7 +905,8 @@ void ShadowsPass::SetupLight(ShadowsCustomBuffer& shadows, RenderContext& render
Float3 frustumCornersVs[8];
for (int32 j = 0; j < 4; j++)
{
float overlapWithPrevSplit = 0.1f * (splitMinRatio - oldSplitMinRatio); // CSM blending overlap
float csmOverlap = atlasLight.BlendCSM ? 0.2f : 0.1f;
float overlapWithPrevSplit = csmOverlap * (splitMinRatio - oldSplitMinRatio);
const auto frustumRangeVS = frustumCorners[j + 4] - frustumCorners[j];
frustumCornersVs[j] = frustumCorners[j] + frustumRangeVS * (splitMinRatio - overlapWithPrevSplit);
frustumCornersVs[j + 4] = frustumCorners[j] + frustumRangeVS * splitMaxRatio;
@@ -1602,7 +1613,9 @@ void ShadowsPass::RenderShadowMask(RenderContextBatch& renderContextBatch, Rende
}
else //if (light.IsDirectionalLight)
{
context->SetState(_psShadowDir.Get(permutationIndex));
auto* atlasLight = shadows.Lights.TryGet(light.ID);
ASSERT_LOW_LAYER(atlasLight);
context->SetState(_psShadowDir.Get(permutationIndex + (atlasLight->BlendCSM ? 8 : 0)));
context->DrawFullscreenTriangle();
}

10
Source/Engine/Renderer/ShadowsPass.h
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@@ -19,11 +19,11 @@ private:
AssetReference<Model> _sphereModel;
GPUPipelineState* _psDepthClear = nullptr;
GPUPipelineState* _psDepthCopy = nullptr;
GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2> _psShadowDir;
GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2> _psShadowPoint;
GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2> _psShadowPointInside;
GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2> _psShadowSpot;
GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2> _psShadowSpotInside;
GPUPipelineStatePermutationsPs<int32(Quality::MAX) * 2 * 2> _psShadowDir;
GPUPipelineStatePermutationsPs<int32(Quality::MAX) * 2> _psShadowPoint;
GPUPipelineStatePermutationsPs<int32(Quality::MAX) * 2> _psShadowPointInside;
GPUPipelineStatePermutationsPs<int32(Quality::MAX) * 2> _psShadowSpot;
GPUPipelineStatePermutationsPs<int32(Quality::MAX) * 2> _psShadowSpotInside;
PixelFormat _shadowMapFormat; // Cached on initialization
public: