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Fix Global Surface Atlas defragmentation flicker when atlas it nearly full

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This commit is contained in:
Wojtek Figat
2024-03-26 16:50:58 +01:00
parent 06a35da0a8
commit 5c356ec22a
1 changed files with 15 additions and 9 deletions
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24
Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.cpp
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@@ -79,10 +79,7 @@ struct GlobalSurfaceAtlasTile : RectPack<GlobalSurfaceAtlasTile, uint16>
}
void OnInsert(class GlobalSurfaceAtlasCustomBuffer* buffer, void* actorObject, int32 tileIndex);
void OnFree()
{
}
void OnFree(GlobalSurfaceAtlasCustomBuffer* buffer);
};
struct GlobalSurfaceAtlasObject
@@ -135,6 +132,7 @@ public:
int32 Resolution = 0;
uint64 LastFrameAtlasInsertFail = 0;
uint64 LastFrameAtlasDefragmentation = 0;
int32 AtlasPixelsUsed = 0;
GPUTexture* AtlasDepth = nullptr;
GPUTexture* AtlasEmissive = nullptr;
GPUTexture* AtlasGBuffer0 = nullptr;
@@ -170,6 +168,7 @@ public:
CulledObjectsCounterIndex = -1;
CulledObjectsUsageHistory.Clear();
LastFrameAtlasDefragmentation = Engine::FrameCount;
AtlasPixelsUsed = 0;
SAFE_DELETE(AtlasTiles);
Objects.Clear();
Lights.Clear();
@@ -230,6 +229,12 @@ public:
void GlobalSurfaceAtlasTile::OnInsert(GlobalSurfaceAtlasCustomBuffer* buffer, void* actorObject, int32 tileIndex)
{
buffer->Objects[actorObject].Tiles[tileIndex] = this;
buffer->AtlasPixelsUsed += (int32)Width * (int32)Height;
}
void GlobalSurfaceAtlasTile::OnFree(GlobalSurfaceAtlasCustomBuffer* buffer)
{
buffer->AtlasPixelsUsed -= (int32)Width * (int32)Height;
}
String GlobalSurfaceAtlasPass::ToString() const
@@ -422,9 +427,10 @@ bool GlobalSurfaceAtlasPass::Render(RenderContext& renderContext, GPUContext* co
else
{
// Perform atlas defragmentation if needed
// TODO: track atlas used vs free ratio to skip defragmentation if it's nearly full (then maybe auto resize up?)
constexpr float maxUsageToDefrag = 0.8f;
if (currentFrame - surfaceAtlasData.LastFrameAtlasInsertFail < 10 &&
currentFrame - surfaceAtlasData.LastFrameAtlasDefragmentation > 60)
currentFrame - surfaceAtlasData.LastFrameAtlasDefragmentation > 60 &&
(float)surfaceAtlasData.AtlasPixelsUsed / (resolution * resolution) < maxUsageToDefrag)
{
surfaceAtlasData.ClearObjects();
}
@@ -516,7 +522,7 @@ bool GlobalSurfaceAtlasPass::Render(RenderContext& renderContext, GPUContext* co
for (auto& tile : it->Value.Tiles)
{
if (tile)
tile->Free();
tile->Free(&surfaceAtlasData);
}
surfaceAtlasData.Objects.Remove(it);
}
@@ -1217,7 +1223,7 @@ void GlobalSurfaceAtlasPass::RasterizeActor(Actor* actor, void* actorObject, con
// Skip too small surfaces
if (object && object->Tiles[tileIndex])
{
object->Tiles[tileIndex]->Free();
object->Tiles[tileIndex]->Free(&surfaceAtlasData);
object->Tiles[tileIndex] = nullptr;
}
continue;
@@ -1240,7 +1246,7 @@ void GlobalSurfaceAtlasPass::RasterizeActor(Actor* actor, void* actorObject, con
anyTile = true;
continue;
}
object->Tiles[tileIndex]->Free();
object->Tiles[tileIndex]->Free(&surfaceAtlasData);
}
// Insert tile into atlas