vault backup: 2025-06-27 18:34:16
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@ -16,9 +16,6 @@ rating: ⭐
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- ShaderWorldActor.h:[[#AShaderWorldActor]]
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- SWorld.h:[[#ASWorld]]
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## FRenderCommandFence
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# USWorldSubsystem
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主要管理：
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- TArray<USWContextBase*> SW_Contexts
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@ -168,8 +165,10 @@ void AShaderWorldActor::ReadbacksManagement()
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- bool
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- RedbuildCollisionContext
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- Array
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- CollisionWorkQueue：类型为FCollisionProcessingWork。
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- CollisionReadToProcess
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- CollisionReadToProcess：
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- CollisionWorkQueue：类型为FCollisionProcessingWork，碰撞处理任务队列，将回读的
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- FCollisionMeshElement
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- ReadBackCompletion：碰撞数据GPU回读是否完成。
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```c++
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@ -230,6 +229,7 @@ void AShaderWorldActor::CollisionManagement(float& DeltaT)
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```
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#### SetupCollisions()
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设置相关变量。
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```c++
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bool AShaderWorldActor::SetupCollisions()
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{
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@ -356,7 +356,7 @@ bool AShaderWorldActor::CollisionFinalizeWork()
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void UShaderWorldCollisionComponent::UpdateSectionTriMesh(TSharedPtr<FSWShareableVerticePositionBuffer, ESPMode::ThreadSafe>& Positions)
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{
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//UBodySetup
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//当UBodySetup更新队列还有任务时，执行改函数会将FSWShareableVerticePositionBuffer加入到UpdatesReceivedDuringCompute数组中并且退出。
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if (AsyncBodySetupQueue.Num() > 0)
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{
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#if SWDEBUG
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@ -370,7 +370,7 @@ void UShaderWorldCollisionComponent::UpdateSectionTriMesh(TSharedPtr<FSWShareabl
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UpdatesReceivedDuringCompute.Empty();
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//使用FSWShareableVerticePositionBuffer数据来更新当前UShaderWorldCollisionComponent
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bool EnsureSameBuffers = ProcMeshSections.Num() > 0 && ProcMeshSections[0].PositionBuffer.IsValid() && (ProcMeshSections[0].PositionBuffer->Positions3f.Num() == 0 || ProcMeshSections[0].PositionBuffer->Positions3f.Num() == Positions->Positions.Num());
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if(!EnsureSameBuffers)
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{
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@ -398,6 +398,7 @@ void UShaderWorldCollisionComponent::UpdateSectionTriMesh(TSharedPtr<FSWShareabl
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{
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if (UShaderWorldCollisionComponent* Comp = Cast<UShaderWorldCollisionComponent>(WeakThis.Get()))
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{
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//塞入Normal
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if(IsValid(Comp))
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Comp->ReceiveComputedNormals(PBuffer, Normals);
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}
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@ -408,8 +409,8 @@ void UShaderWorldCollisionComponent::UpdateSectionTriMesh(TSharedPtr<FSWShareabl
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//Materials
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// Pass new positions to trimesh
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UpdateCollision();
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UpdateLocalBounds(); // Update overall bounds
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UpdateCollision();//1. 异步Cook UBodySetup 2. 删除原本的碰撞 3. UseBodySetup->CreatePhysicsMeshesAsync()，使用UBodySetup异步创建新的碰撞网格。
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UpdateLocalBounds();//更新UShaderWorldCollisionComponent的LocalBoundingBox
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UpdateNavigation();
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if (ProcMeshSections.Num() > 0 && (ProcMeshSections[0].bSectionVisible || (GetWorld() && !GetWorld()->IsGameWorld())))
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@ -423,6 +424,7 @@ void UShaderWorldCollisionComponent::UpdateSectionTriMesh(TSharedPtr<FSWShareabl
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SectionData->TargetSection = 0;
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SectionData->NewPositionBuffer = ProcMeshSections[0].PositionBuffer;
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//更新SceneProxy FShaderWProceduralMeshSceneProxy的NewPositionBuffer，也就是UpdateSection
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if(AShaderWorldActor* owner = Cast<AShaderWorldActor>(GetOwner()))
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{
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{
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@ -450,6 +452,192 @@ void UShaderWorldCollisionComponent::UpdateSectionTriMesh(TSharedPtr<FSWShareabl
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}
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}
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```
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#### CollisionPreprocessGPU()
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GPU生成碰撞 的预处理阶段。
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```c++
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bool AShaderWorldActor::CollisionPreprocessGPU()
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{
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SCOPED_NAMED_EVENT_TEXT("AShaderWorldActor::CollisionPreprocessGPU()", FColor::Magenta);
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SW_FCT_CYCLE()
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for (int32 CollID = CollisionReadToProcess.Num() - 1; CollID >= 0; CollID--)
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{
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const FName& ElID = CollisionReadToProcess[CollID];
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if (!CollisionMesh.Find(ElID))
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{
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CollisionWorkQueue.Empty();
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CollisionReadToProcess.RemoveAt(CollID);
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continue;
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}
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//判断FCollisionMeshElement是否有效，以及是否将碰撞数据回读完成，如果完成，则将数据添加到碰撞处理队列CollisionWorkQueue，并且从碰撞回读队列CollisionReadToProcess
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FCollisionMeshElement& Mesh = *CollisionMesh.Find(ElID);
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if ((*Mesh.ReadBackCompletion.Get()))
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{
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ensure(Mesh.Mesh);
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if(FGeoCProcMeshSection* Section = Mesh.Mesh->GetProcMeshSection(0))
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{
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if(CollisionMesh.Contains(CollisionBufferHolder))
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{
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CollisionWorkQueue.Emplace(
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ElID
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, Mesh.HeightData
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, (*CollisionMesh.Find(CollisionBufferHolder)).Mesh->VerticesTemplate
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, (*CollisionMesh.Find(CollisionBufferHolder)).Mesh->TrianglesTemplate);
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}
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else
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{
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SW_LOG("!CollisionMesh.Contains(CollisionBufferHolder)")
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}
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}
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else
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{
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SW_LOG("CollisionPreprocessGPU :: Mesh.Mesh->GetProcMeshSection(0) = nullptr")
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}
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CollisionReadToProcess.RemoveAt(CollID);
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}
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}
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if (!CollisionReadToProcess.IsEmpty())
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{
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return false;
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}
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CollisionReadToProcess.Empty();
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if (CollisionWorkQueue.Num() > 0)
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{
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(*bProcessingGroundCollision.Get()) = true;
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AShaderWorldActor* SWContext = this;
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Async(EAsyncExecution::TaskGraph, [Completion = bProcessingGroundCollision, RenderAPI = RendererAPI, VerticesPerPatch = CollisionVerticesPerPatch, Work = CollisionWorkQueue]
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{
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ParallelFor(Work.Num(), [&](int32 WorkIndex)
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{
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const FCollisionProcessingWork& WorkEl = Work[WorkIndex];
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if (!WorkEl.Read.IsValid() || !WorkEl.SourceB.IsValid() || !WorkEl.DestB.IsValid())
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return;
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const int NumOfVertex = WorkEl.SourceB->Positions.Num();
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WorkEl.DestB->Positions.SetNum(NumOfVertex);
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WorkEl.DestB->Positions3f.SetNum(NumOfVertex);
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WorkEl.DestB->MaterialIndices.SetNum(NumOfVertex);
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WorkEl.DestB->Bound = FBox(EForceInit::ForceInit);
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FVector LocationfVertice_WS(0);
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uint16 MaterialIndice = 0;
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uint8* ReadData8 = (uint8*)WorkEl.Read->ReadData.GetData();
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TSet<int32>& TrianglesAffectedByHoles = WorkEl.DestB->TrianglesAffectedByHoles;
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TrianglesAffectedByHoles.Empty();
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//#TODO ISPC slower ?
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#if 0 // INTEL_ISPC
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if (RenderAPI == EGeoRenderingAPI::OpenGL)
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{
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ispc::ShaderWorld_HeightFromGPUReadOpenGL(NumOfVertex, VerticesPerPatch, ReadData8,(ispc::FVector*)WorkEl.SourceB->Positions.GetData(), (ispc::FVector*)WorkEl.DestB->Positions.GetData(), (ispc::FVector3f*)WorkEl.DestB->Positions3f.GetData(), WorkEl.DestB->MaterialIndices.GetData());
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}
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else
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{
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ispc::ShaderWorld_HeightFromGPURead(NumOfVertex, VerticesPerPatch, ReadData8, (ispc::FVector3f*)WorkEl.SourceB->Positions3f.GetData(), (ispc::FVector*)WorkEl.DestB->Positions.GetData(), (ispc::FVector3f*)WorkEl.DestB->Positions3f.GetData(), WorkEl.DestB->MaterialIndices.GetData());
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}
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#else
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for (int32 k = 0; k < NumOfVertex; k++)
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{
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if (RenderAPI == EGeoRenderingAPI::OpenGL)
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{
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const int index = k % VerticesPerPatch + (VerticesPerPatch - 1 - (k / VerticesPerPatch)) * VerticesPerPatch;
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LocationfVertice_WS = FVector(WorkEl.SourceB->Positions[k].X, WorkEl.SourceB->Positions[k].Y, GetHeightFromGPURead(&ReadData8[4 * index], MaterialIndice));
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}
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else
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LocationfVertice_WS = FVector(WorkEl.SourceB->Positions[k].X, WorkEl.SourceB->Positions[k].Y, GetHeightFromGPURead(&ReadData8[4 * k], MaterialIndice));
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WorkEl.DestB->Positions[k] = LocationfVertice_WS;
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WorkEl.DestB->Positions3f[k] = FVector3f(LocationfVertice_WS);
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WorkEl.DestB->MaterialIndices[k] = MaterialIndice;
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/*
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* Height below -7km means terrain hole
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*/
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if(WorkEl.DestB->Positions[k].Z < -700000.0)
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{
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/*
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* Find triangles including this vertex and add them to removed triangles
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*/
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if(WorkEl.SourceB->PositionToTriangle.Contains(k))
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{
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TrianglesAffectedByHoles.Append(*WorkEl.SourceB->PositionToTriangle.Find(k));
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}
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}
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else
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{
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WorkEl.DestB->Bound += WorkEl.DestB->Positions[k];
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}
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}
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#endif
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/*
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* If the terrain has holes, create a custom index buffer with the related triangles removed
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*/
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if(TrianglesAffectedByHoles.Num() > 0)
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{
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WorkEl.DestB->FilteredTriangles = MakeShared<FSWShareableIndexBuffer, ESPMode::ThreadSafe>();
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for(int32 Triangle = 0; Triangle < WorkEl.TriangleTemplate->Indices.Num()/3; Triangle++)
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{
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if(!TrianglesAffectedByHoles.Contains(Triangle))
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{
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WorkEl.DestB->FilteredTriangles->Indices.Add(WorkEl.TriangleTemplate->Indices[Triangle * 3]);
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WorkEl.DestB->FilteredTriangles->Indices.Add(WorkEl.TriangleTemplate->Indices[Triangle * 3 + 1]);
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WorkEl.DestB->FilteredTriangles->Indices.Add(WorkEl.TriangleTemplate->Indices[Triangle * 3 + 2]);
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WorkEl.DestB->FilteredTriangles->Triangles_CollisionOnly.Add(WorkEl.TriangleTemplate->Triangles_CollisionOnly[Triangle]);
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}
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}
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}
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else
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{
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WorkEl.DestB->FilteredTriangles.Reset();
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}
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//WorkEl.DestB->Bound = FBox(WorkEl.DestB->Positions);
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}
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);
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if (Completion.IsValid())
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Completion->AtomicSet(false);
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});
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}
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return true;
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}
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```
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### SpawnablesManagement()
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### TerrainAndSpawnablesManagement()
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