UE4 MeshPass 全流程

FPrimitiveSceneShaderData

== FPrimitiveSceneShaderData(Scene.PrimitiveSceneProxies)

FSceneRenderer::ComputeViewVisibility(...)

Readback

ComputeAndMarkRelevanceForViewParallel

FScatterCS

...

FPrimitiveUniformShaderParameters

Fill some data of FViewInfo

new FMeshBatchAndRelevance

View.ViewUniformBuffer.UpdateUniformBufferImmediate

UActorComponent::SendRenderDynamicData_Concurrent()

AddStaticMeshes

FMemcpyCS

View.DynamicMeshElementsPassRelevance

ResizeResourceIfNeeded

UUnrealEdEngine::Tick(..)

FrustumCull

Replace VisibleMeshDrawCommands

UActorComponent::ExecuteUnregisterEvents()

FMeshPassProcessor

Update

NewVisibleMeshDrawCommand.Setup

FRendererModule::BeginRenderingViewFamily

ParallelForTemplate

TaskContext.bUseGPUScene

OnVirtualTextureDestroyed

RemovedPrimitiveSceneInfos

DynamicPrimitiveShaderData

END

FCoreDelegates::OnBeginFrame.Broadcast()

RHICmdList.DrawIndexedPrimitive

FMeshDrawCommand

FMeshDrawCommand::SubmitDraw

CachedMeshDrawCommandStateBuckets.ComputeHash

FPrimitiveSceneProxy::GetViewRelevance

Call Stack

CreateLightPrimitiveInteractionsForPrimitive

RHICmdList.SetStencilRef

FDrawCommandRelevancePacket::AddCommandsForMesh

View.CachedViewUniformShaderParameters

FStaticMeshSceneProxy::GetMeshElement

delete PrimitiveSceneInfo->Proxy;delete PrimitiveSceneInfo;

TempVisibleMeshDrawCommands.Reset()

END ParallelFor

PrimitiveIdBufferData

End

IndirectLightingCacheUniformBuffer

FMeshPassProcessor::BuildMeshDrawCommands

IsMobilePlatform

ENQUEUE_RENDER_COMMANDBeginFrameRenderThread

FViewport::Draw(...)

SubmitMeshDrawCommandsRange

FMeshPassDrawListContext::AddCommand

MeshDrawCommand.IndexBuffer

Scene.GPUScene.LightmapUploadBuffer.Add

View.bReverseCullingView.bRenderSceneTwoSided

UpdateGPUScene

FStaticMeshSceneProxy::DrawStaticElements

LockResource

Scene.GPUScene.PrimitiveUploadBuffer.ResourceUploadTo

Per FVertexInputStream

FDynamicPassMeshDrawListContext::AddCommand

FPrimitiveSceneInfo::AddToScene

VisibleMeshDrawCommands

IndirectLightingCacheAllocation

FViewUniformShaderParameters::PrimitiveSceneData

FScene::RemovePrimitive (GameThread)

UnlockResourceGPUScene

NumVisibleStaticMeshElements++

Scene.GPUScene.LightmapUploadBuffer

Used

OcclusionCull

ApplyViewOverridesToMeshDrawCommands

FMeshDrawCommand::GetDynamicInstancingHash

FLightmapSceneShaderData::Setup

Code Run

XXXShader->GetShaderBindings

AddToPrimitiveOctree

UPrimitiveComponent::DestroyRenderState_Concurrent

TempVisibleMeshDrawCommands

bRenderDynamicDataDirty

FRWBufferStructured

FMeshPassProcessor::AddMeshBatch

UPrimitiveComponent::ShouldRecreateProxyOnUpdateTransform()

UActorComponent::MarkForNeededEndOfFrameUpdate()

NumOfStaticMeshBatch = NumLOD * NumSection + NumUnifiedMeshNumUnifiedMesh = NumLOD

FStaticMeshBatch

BuildMeshDrawCommandPrimitiveIdBuffer

Chunk

Main ThreadFEngineLoop::Tick

FStaticMeshBatchRelevance

UPrimitiveComponent::CreateRenderState_Concurrent

ViewRelevance.HasTranslucency()

UpdateGPUSceneInternal

FMeshPassProcessor::SetDrawListContext

RHICmdList.ApplyCachedRenderTargets

FMeshBatchAndRelevance

FPrimitiveSceneInfo::UpdateUniformBuffer

AddedPrimitiveSceneInfos

ENQUEUE_RENDER_COMMANDFScene::UpdateAllPrimitiveSceneInfos

ComputeLODForMeshes

NULL

UpdateAllPrimitiveSceneInfos

FScene::RemoveLight

FParallelMeshDrawCommandPass::DispatchPassSetup

ChunkSize = Chunk.DataSize + sizeof(FTaggedMemory)

Top

FCachedPassMeshDrawListContext::FinalizeCommand

new FStaticMeshBatch

FMaterialRelevance

bUseCachedMeshCommand

bRenderStateDirty

FGraphicsMinimalPipelineStateInitializer

GPUScene.PrimitiveBuffer->SRV

ReflectionCaptures

FPrimitiveSceneInfo::CacheMeshDrawCommands

FSceneRenderer::CreateSceneRenderer(...)

DrawList.Add(NewVisibleMeshDrawCommand)

FDynamicMeshDrawCommandStorage

UseGPUScene

UActorComponent::MarkForNeededEndOfFrameRecreate()

new FStaticMeshBatchRelevance

UEditorEngine::Tick(...)

UWorld::SendAllEndOfFrameUpdates()

bDynamicInstancing

FPrecomputedLightingUniformParameters

NumDynamicBuildRequestElements[PassType] += StaticMeshRelevance.NumElements;DynamicBuildRequests[PassType].Add(&StaticMesh);

FScene::AddLight

OutHasDynamicMeshElementsMasks

FMemory::Memcmp

FSceneRenderer::GatherDynamicMeshElements

FMeshBatchElement

(Render)

FPrimitiveViewRelevance::bDrawRelevance

FTextureRWBuffer2D

UpdateSceneStaticMeshArrays

DrawListStorage.MeshDrawCommands.AddElement

FSceneRenderer::SetupMeshPass

ParallelCommandListSet

UpdateUniformResource

FViewUniformShaderParameters

RHICmdList.DrawIndexedPrimitiveIndirect

FScene::AddPrimitiveSceneInfo_RenderThread

EMeshPass::Type

/** * The following arrays are densely packed primitive data needed by various * rendering passes. PrimitiveSceneInfo->PackedIndex maintains the index * where data is stored in these arrays for a given primitive. *//** Packed array of primitives in the scene. */TArray<FPrimitiveSceneInfo*> Primitives;/** Packed array of all transforms in the scene. */TArray<FMatrix> PrimitiveTransforms;/** Packed array of primitive scene proxies in the scene. */TArray<FPrimitiveSceneProxy*> PrimitiveSceneProxies;/** Packed array of primitive bounds. */TArray<FPrimitiveBounds> PrimitiveBounds;/** Packed array of primitive flags. */TArray<FPrimitiveFlagsCompact> PrimitiveFlagsCompact;/** Packed array of precomputed primitive visibility IDs. */TArray<FPrimitiveVisibilityId> PrimitiveVisibilityIds;/** Packed array of primitive occlusion flags. See EOcclusionFlags. */TArray<uint8> PrimitiveOcclusionFlags;/** Packed array of primitive occlusion bounds. */TArray<FBoxSphereBounds> PrimitiveOcclusionBounds;/** Packed array of primitive components associated with the primitive. */TArray<FPrimitiveComponentId> PrimitiveComponentIds;/** Packed array of runtime virtual texture flags. */TArray<FPrimitiveVirtualTextureFlags> PrimitiveVirtualTextureFlags;/** Packed array of runtime virtual texture lod info. */TArray<FPrimitiveVirtualTextureLodInfo> PrimitiveVirtualTextureLod;TBitArray<> PrimitivesNeedingStaticMeshUpdate;TSet<FPrimitiveSceneInfo*> PrimitivesNeedingStaticMeshUpdateWithoutVisibilityCheck;

XXXPassMeshProcessor::Process

ViewState->SceneSoftwareOcclusion

FScene::UpdateAllPrimitiveSceneInfos

FMeshDrawCommand::SetDrawParametersAndFinalize

View.DynamicMeshElements

SetGraphicsPipelineState

FMeshCommandOneFrameArray

FVisibleMeshDrawCommand::StateBucketId

FStaticMeshSceneProxy::SetMeshElementGeometrySource

FScene::RemovePrimitiveSceneInfo_RenderThread

FPrimitiveSceneShaderData::Setup

LightmapDataOffset

FRelevancePacket::MarkRelevant(StaticRelevance)

Flow Into

bUseGPUScene

FPrimitiveSceneProxy::GetDynamicMeshElements

FDrawVisibleMeshCommandsAnyThreadTask::DoTask

TempVisibleMeshDrawCommands.Add(NewVisibleMeshDrawCommand)

FMeshBatch::PreparePrimitiveUniformBuffer

FMeshPassDrawListContext::FinalizeCommand

MeshDrawCommand.NumPrimitives > 0

FPrimitiveViewRelevance

UActorComponent::DoDeferredRenderUpdates_Concurrent()

Fill FViewCommands

FGPUScene::PrimitiveBufferFGPUScene::LightmapDataBuffer

FLightmapSceneShaderData

Additional Flag

Scene.GPUScene.PrimitiveUploadViewBuffer.ResourceUploadTo

RHICmdList.DrawPrimitiveIndirect

PassMask.Set(EMeshPass::XXX);View.NumVisibleDynamicMeshElements[EMeshPass::XXX] += NumElements;

TaskContext.PrimitiveIdBufferData

Scene.GPUScene.PrimitiveUploadBuffer.Init

UploadDynamicPrimitiveShaderDataForView

FPrimitiveViewRelevance::bDynamicRelevance

FMeshDrawCommandPassSetupTaskContext

FScene::UpdatePrimitiveTransform

View.PrecomputedVisibilityData

UpdateTranslucentMeshSortKeys

FDynamicPassMeshDrawListContext::FinalizeCommand

FDynamicPassMeshDrawListContext

FScene::AddPrimitive (GameThread)

/** A map from static mesh ID to a boolean visibility value. */FSceneBitArray StaticMeshVisibilityMap;/** A map from static mesh ID to a boolean dithered LOD fade out value. */FSceneBitArray StaticMeshFadeOutDitheredLODMap;/** A map from static mesh ID to a boolean dithered LOD fade in value. */FSceneBitArray StaticMeshFadeInDitheredLODMap;

Context.MeshDrawCommands.Sort(FCompareFMeshDrawCommands())

bHZBOcclusion

GenerateDynamicMeshDrawCommands

Create and update some UBO

RHILockVertexBuffer

GPUScene

FMeshElementCollector::AddMesh

ForcedLodModel > 0

MeshDrawCommandStorage.MeshDrawCommands.Add(1)

UPrimitiveComponent::SendRenderTransform_Concurrent()

bRenderTransformDirty

RelevantStaticPrimitives

FMeshBatch

/** The primitive's static elements are rendered for the view. */uint32 bStaticRelevance : 1;  /** The primitive's dynamic elements are rendered for the view. */uint32 bDynamicRelevance : 1;/** The primitive is drawn. */uint32 bDrawRelevance : 1;/** The primitive is casting a shadow. */uint32 bShadowRelevance : 1;

WaitForMeshPassSetupTask()

FDeferredShadingSceneRenderer::Render(FRHICommandListImmediate& RHICmdList)

FViewInfo::OneFramePrimitiveShaderDataBufferFSceneViewState::PrimitiveShaderDataBuffer

GetWorld()

Scene.GPUScene.PrimitiveUploadViewBuffer.Init

MeshDrawCommandStorage.MeshDrawCommands.AddElement

FMeshDrawCommandPassSetupTask::AnyThreadTask

FMeshDrawCommandSortKeyunion {    uint64 PackedData;    struct    {        uint64 VertexShaderHash: 16; // Order by vertex shader's hash.        uint64 PixelShaderHash: 32; // Order by pixel shader's hash.        uint64 Masked: 16; // First order by masked.    } BasePass;    struct    {        uint64 MeshIdInPrimitive: 16; // Order meshes belonging to the same primitive by a stable id.        uint64 Distance: 32; // Order by distance.        uint64 Priority: 16; // First order by priority.    } Translucent;    struct     {        uint64 VertexShaderHash : 32;// Order by vertex shader's hash.        uint64 PixelShaderHash : 32;// First order by pixel shader's hash.    } Generic;};

FRelevancePacket::RenderThreadFinalize

FMemStackBase (Use FMemMark Manually Free or Auto Free at Thread End)

Free

FRelevancePacket::ComputeRelevance

UploadDynamicPrimitiveShaderDataForViewInternal

ComputeDynamicMeshRelevance

FPrimitiveSceneInfo::AddStaticMeshes

GGPUSceneValidatePrimitiveBuffer

Scene.GPUScene.LightmapUploadBuffer.ResourceUploadTo

FBatchingSPDI::DrawMesh

FStaticMeshSceneProxy::GetShadowMeshElement

UpdateBounds

/** A map from primitive ID to a boolean visibility value. */FSceneBitArray PrimitiveVisibilityMap;/** Bit set when a primitive is known to be unoccluded. */FSceneBitArray PrimitiveDefinitelyUnoccludedMap;/** A map from primitive ID to a boolean is fading value. */FSceneBitArray PotentiallyFadingPrimitiveMap;/** A map from primitive ID to a boolean is distance culled */FSceneBitArray DistanceCullingPrimitiveMap;

CachedMeshDrawCommandStateBuckets.FindOrAddIdByHash

FMeshDrawCommand::MatchesForDynamicInstancing

FDeferredShadingSceneRenderer::InitViews(...)

VisibleMeshDrawCommand.DrawPrimitiveId

UActorComponent::RecreateRenderState_Concurrent()

ParallelFor

RHICmdList.DrawPrimitive

Per Pass

UpdateVirtualTexture

FMaterialRenderProxy::UpdateDeferredCachedUniformExpressions

Scene.GPUScene.PrimitiveUploadBuffer.Add

Scene.GPUScene.PrimitiveUploadViewBuffer.Add

RHICmdList.SetStreamSource

IsUnreachable()

UpdatedAttachmentRoots.Reset();UpdatedTransforms.Reset();UpdatedCustomPrimitiveParams.Reset();OverridenPreviousTransforms.Reset();DistanceFieldSceneDataUpdates.Reset();RemovedPrimitiveSceneInfos.Reset();AddedPrimitiveSceneInfos.Reset();

UWorld::MarkActorComponentForNeededEndOfFrameUpdate()

UEditorEngine::UpdateSingleViewportClient(...)

FEditorViewportClient::Draw(...)

FParallelMeshDrawCommandPass::DispatchDraw

FVertexFactory

AddPrimitiveToUpdateGPU