UE Rendering

SViewport(UI),  FViewport(RenderTarget), FViewportClient(Logic)

GameThread　　　　　　　　RenderingThread　　　　--Graphics API->　　GPU

Engine　　　　　　　　　　　　Renderer, RHI,RenderＣore, RHICore

UWorld　　　　　　　　　　　　UScene　　　　　　　　　　　　　　　　GPUScene

UPrimitiveComponent/Proxy　　　PrimitiveSceneProxy/SceneInfo　　　　　　GetPrimitiveData(Parameters.PrimitiveID).xxxx

ULightComponent/Proxy　　　　　LightSceneProxy/SceneInfo

FSceneView　　　　　　　　　　FSceneView,FViewInfo

注意：要时刻注意当前的代码是在游戏线程中执行，还是在渲染线程中执行

void UGameViewportClient::Draw(FViewport* InViewport, FCanvas* SceneCanvas)　

// create the view family for rendering the world scene to the viewport's render target
FSceneViewFamilyContext ViewFamily(FSceneViewFamily::ConstructionValues(
InViewport,
MyWorld->Scene,
EngineShowFlags)
.SetRealtimeUpdate(true));

FSceneView* View = LocalPlayer->CalcSceneView(&ViewFamily, ViewLocation, ViewRotation, InViewport, nullptr, PassType);

GetRendererModule().BeginRenderingViewFamily(SceneCanvas,&ViewFamily);

 

void FRendererModule::BeginRenderingViewFamily(FCanvas* Canvas, FSceneViewFamily* ViewFamily)

　　FScene* const Scene = ViewFamily->Scene->GetRenderScene();
　　if (Scene)
　　{
　　　　World = Scene->GetWorld();
　　　　if (World)
　　　　{
　　　　//guarantee that all render proxies are up to date before kicking off a BeginRenderViewFamily.
　　　　World->SendAllEndOfFrameUpdates();
　　　　}
　　}

　　// Construct the scene renderer. This copies the view family attributes into its own structures.
　　FSceneRenderer* SceneRenderer = FSceneRenderer::CreateSceneRenderer(ViewFamily, Canvas->GetHitProxyConsumer());

　　//通过任务队列的方式，向渲染线程发送任务，进行相关的渲染准备工作

　　ENQUEUE_RENDER_COMMAND(FDrawSceneCommand)(　　　　　　　　//向渲染线程队列发送命令，下面的代码逻辑由渲染线程负责执行；先发送的任务先被执行
　　[SceneRenderer, DrawSceneEnqueue](FRHICommandListImmediate& RHICmdList)
　　{

　　　　RenderViewFamily_RenderThread(RHICmdList, SceneRenderer);
　　　　FlushPendingDeleteRHIResources_RenderThread();
　　});

　　

　　typedef TEnqueueUniqueRenderCommandType<TSTR, LAMBDA> EURCType;

　　TGraphTask<EURCType>::CreateTask().ConstructAndDispatchWhenReady(Forward<LAMBDA>(Lambda));

　　class TEnqueueUniqueRenderCommandType : public FRenderCommand

　　FRHICommandListImmediate& RHICmdList = GetImmediateCommandList_ForRenderCommand();　　// FRHICommandListExecutor::GetImmediateCommandList(); ----> GRHICommandList.CommandListImmediate
　　Lambda(RHICmdList);