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Add limit to max DDGI cascade updates per-frame to 2

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#3963
This commit is contained in:
Wojtek Figat
2026-03-11 23:31:44 +01:00
parent 22c88eb59d
commit ace84ae29f
1 changed files with 7 additions and 1 deletions
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8
Source/Engine/Renderer/GI/DynamicDiffuseGlobalIllumination.cpp
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@@ -90,6 +90,7 @@ public:
Float3 ProbesOrigin;
float ProbesSpacing = 0.0f;
Int3 ProbeScrollOffsets;
bool PendingUpdate = true;
Int3 ProbeScrollClears;
void Clear()
@@ -97,6 +98,7 @@ public:
ProbesOrigin = Float3::Zero;
ProbeScrollOffsets = Int3::Zero;
ProbeScrollClears = Int3::Zero;
PendingUpdate = true;
}
} Cascades[4];
@@ -457,9 +459,12 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
//const uint64 cascadeFrequencies[] = { 1, 1, 1, 1 };
//const uint64 cascadeFrequencies[] = { 10, 10, 10, 10 };
bool cascadeSkipUpdate[4];
int32 maxCascadesPerFrame = renderContext.View.IsSingleFrame ? cascadesCount : 2;
for (int32 cascadeIndex = 0; cascadeIndex < cascadesCount; cascadeIndex++)
{
cascadeSkipUpdate[cascadeIndex] = !clear && (ddgiData.LastFrameUsed % cascadeFrequencies[cascadeIndex]) != 0 && GPU_SPREAD_WORKLOAD;
auto& cascade = ddgiData.Cascades[cascadeIndex];
cascade.PendingUpdate |= !clear && (ddgiData.LastFrameUsed % cascadeFrequencies[cascadeIndex]) != 0 && GPU_SPREAD_WORKLOAD;
cascadeSkipUpdate[cascadeIndex] = !cascade.PendingUpdate || maxCascadesPerFrame-- <= 0;
}
// Compute scrolling (probes are placed around camera but are scrolling to increase stability during movement)
@@ -468,6 +473,7 @@ bool DynamicDiffuseGlobalIlluminationPass::RenderInner(RenderContext& renderCont
if (cascadeSkipUpdate[cascadeIndex])
continue;
auto& cascade = ddgiData.Cascades[cascadeIndex];
cascade.PendingUpdate = false;
// Calculate the count of grid cells between the view origin and the scroll anchor
const Float3 volumeOrigin = cascade.ProbesOrigin + Float3(cascade.ProbeScrollOffsets) * cascade.ProbesSpacing;