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Reimplement cascaded shadow maps blending via dithering

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This commit is contained in:
Wojtek Figat
2024-04-05 10:59:34 +02:00
parent 8bd409e95d
commit 0cc6669cbd
11 changed files with 46 additions and 52 deletions
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18
Source/Engine/Renderer/ShadowsPass.cpp
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@@ -27,7 +27,8 @@ PACK_STRUCT(struct Data{
ShaderLightData Light;
Matrix WVP;
Matrix ViewProjectionMatrix;
Float2 Dummy0;
float Dummy0;
float TemporalTime;
float ContactShadowsDistance;
float ContactShadowsLength;
});
@@ -62,7 +63,6 @@ struct ShadowAtlasLight
int32 ContextCount;
uint16 Resolution;
uint16 TilesNeeded;
bool BlendCSM;
float Sharpness, Fade, NormalOffsetScale, Bias, FadeDistance;
Float4 CascadeSplits;
ShadowsAtlasTile* Tiles[MaxTiles];
@@ -294,15 +294,7 @@ void ShadowsPass::SetupLight(RenderContext& renderContext, RenderContextBatch& r
Float3 lightDirection = light.Direction;
float shadowsDistance = Math::Min(view.Far, light.ShadowsDistance);
int32 csmCount = Math::Clamp(light.CascadeCount, 0, MAX_CSM_CASCADES);
bool blendCSM = Graphics::AllowCSMBlending;
const auto shadowMapsSize = (float)atlasLight.Resolution;
#if USE_EDITOR
if (IsRunningRadiancePass)
blendCSM = false;
#elif PLATFORM_SWITCH || PLATFORM_IOS || PLATFORM_ANDROID
// Disable cascades blending on low-end platforms
blendCSM = false;
#endif
// Views with orthographic cameras cannot use cascades, we force it to 1 shadow map here
if (view.Projection.M44 == 1.0f)
@@ -397,7 +389,6 @@ void ShadowsPass::SetupLight(RenderContext& renderContext, RenderContextBatch& r
// Init shadow data
atlasLight.ContextIndex = renderContextBatch.Contexts.Count();
atlasLight.ContextCount = csmCount;
atlasLight.BlendCSM = blendCSM;
renderContextBatch.Contexts.AddDefault(atlasLight.ContextCount);
// Create the different view and projection matrices for each split
@@ -413,9 +404,7 @@ void ShadowsPass::SetupLight(RenderContext& renderContext, RenderContextBatch& r
// Calculate cascade split frustum corners in view space
for (int32 j = 0; j < 4; j++)
{
float overlap = 0;
if (blendCSM)
overlap = 0.2f * (splitMinRatio - oldSplitMinRatio);
float overlap = 0.1f * (splitMinRatio - oldSplitMinRatio); // CSM blending overlap
const auto frustumRangeVS = mainCache->FrustumCornersVs[j + 4] - mainCache->FrustumCornersVs[j];
frustumCorners[j] = mainCache->FrustumCornersVs[j] + frustumRangeVS * (splitMinRatio - overlap);
frustumCorners[j + 4] = mainCache->FrustumCornersVs[j] + frustumRangeVS * splitMaxRatio;
@@ -927,6 +916,7 @@ void ShadowsPass::RenderShadowMask(RenderContextBatch& renderContextBatch, Rende
else if (light.IsSpotLight)
((RenderSpotLightData&)light).SetShaderData(sperLight.Light, true);
Matrix::Transpose(view.ViewProjection(), sperLight.ViewProjectionMatrix);
sperLight.TemporalTime = renderContext.List->Setup.UseTemporalAAJitter ? RenderTools::ComputeTemporalTime() : 0.0f;
sperLight.ContactShadowsDistance = light.ShadowsDistance;
sperLight.ContactShadowsLength = EnumHasAnyFlags(view.Flags, ViewFlags::ContactShadows) ? light.ContactShadowsLength : 0.0f;
if (isLocalLight)