C++ SCOPED_DRAW_EVENT函数代码示例

/** Draws a full view quad that sets stencil to 1 anywhere that decals should not be projected. */
void StencilDecalMask(const FSceneView& View)
{
	SCOPED_DRAW_EVENT(StencilDecalMask, DEC_SCENE_ITEMS);
	RHISetRasterizerState(TStaticRasterizerState<FM_Solid,CM_None>::GetRHI());
	RHISetBlendState(TStaticBlendState<CW_NONE>::GetRHI());
	RHISetRenderTarget(NULL, GSceneRenderTargets.GetSceneDepthSurface());
	RHISetViewport(View.ViewRect.Min.X, View.ViewRect.Min.Y, 0.0f, View.ViewRect.Max.X, View.ViewRect.Max.Y, 1.0f);

	// Write 1 to highest bit of stencil to areas that should not receive decals
	RHISetDepthStencilState(TStaticDepthStencilState<false,CF_Always,true,CF_Always,SO_Replace,SO_Replace,SO_Replace>::GetRHI(), 0x80);

	TShaderMapRef<FScreenVS> ScreenVertexShader(GetGlobalShaderMap());
	TShaderMapRef<FStencilDecalMaskPS> PixelShader(GetGlobalShaderMap());
	
	SetGlobalBoundShaderState(StencilDecalMaskBoundShaderState, GFilterVertexDeclaration.VertexDeclarationRHI, *ScreenVertexShader, *PixelShader);

	PixelShader->SetParameters(View);

	DrawRectangle( 
		0, 0, 
		View.ViewRect.Width(), View.ViewRect.Height(),
		View.ViewRect.Min.X, View.ViewRect.Min.Y, 
		View.ViewRect.Width(), View.ViewRect.Height(),
		FIntPoint(View.ViewRect.Width(), View.ViewRect.Height()),
		GSceneRenderTargets.GetBufferSizeXY(),
		EDRF_UseTriangleOptimization);
}

void FCompositionLighting::ProcessBeforeBasePass(FRHICommandListImmediate& RHICmdList, FViewInfo& View)
{
	check(IsInRenderingThread());

	// so that the passes can register themselves to the graph
	{
		FMemMark Mark(FMemStack::Get());
		FRenderingCompositePassContext CompositeContext(RHICmdList, View);

		FPostprocessContext Context(CompositeContext.Graph, View);

		// Add the passes we want to add to the graph (commenting a line means the pass is not inserted into the graph) ----------

		// decals are before AmbientOcclusion so the decal can output a normal that AO is affected by
		if (Context.View.Family->EngineShowFlags.Decals &&
			!Context.View.Family->EngineShowFlags.ShaderComplexity &&
			IsDBufferEnabled()) 
		{
			FRenderingCompositePass* Pass = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessDeferredDecals(DRS_BeforeBasePass));
			Pass->SetInput(ePId_Input0, Context.FinalOutput);

			Context.FinalOutput = FRenderingCompositeOutputRef(Pass);
		}

		// The graph setup should be finished before this line ----------------------------------------

		SCOPED_DRAW_EVENT(RHICmdList, CompositionBeforeBasePass);

		CompositeContext.Process(Context.FinalOutput.GetPass(), TEXT("Composition_BeforeBasePass"));
	}
}

/** Draws a full view quad that sets stencil to 1 anywhere that decals should not be projected. */
void StencilDecalMask(FRHICommandList& RHICmdList, const FViewInfo& View, bool bUseHmdMesh)
{
	SCOPED_DRAW_EVENT(RHICmdList, StencilDecalMask);
	FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);
	RHICmdList.SetRasterizerState(TStaticRasterizerState<FM_Solid, CM_None>::GetRHI());
	RHICmdList.SetBlendState(TStaticBlendState<CW_NONE>::GetRHI());
	SetRenderTarget(RHICmdList, NULL, SceneContext.GetSceneDepthSurface(), ESimpleRenderTargetMode::EUninitializedColorExistingDepth, FExclusiveDepthStencil::DepthRead_StencilWrite);
	RHICmdList.SetViewport(View.ViewRect.Min.X, View.ViewRect.Min.Y, 0.0f, View.ViewRect.Max.X, View.ViewRect.Max.Y, 1.0f);

	// Write 1 to highest bit of stencil to areas that should not receive decals
	RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always, true, CF_Always, SO_Replace, SO_Replace, SO_Replace>::GetRHI(), 0x80);

	const auto FeatureLevel = View.GetFeatureLevel();
	auto ShaderMap = View.ShaderMap;
	TShaderMapRef<FScreenVS> ScreenVertexShader(ShaderMap);
	TShaderMapRef<FStencilDecalMaskPS> PixelShader(ShaderMap);
	
	SetGlobalBoundShaderState(RHICmdList, FeatureLevel, StencilDecalMaskBoundShaderState, GFilterVertexDeclaration.VertexDeclarationRHI, *ScreenVertexShader, *PixelShader);

	PixelShader->SetParameters(RHICmdList, View);

	DrawPostProcessPass(
		RHICmdList,
		0, 0,
		View.ViewRect.Width(), View.ViewRect.Height(),
		View.ViewRect.Min.X, View.ViewRect.Min.Y,
		View.ViewRect.Width(), View.ViewRect.Height(),
		FIntPoint(View.ViewRect.Width(), View.ViewRect.Height()),
		SceneContext.GetBufferSizeXY(),
		*ScreenVertexShader,
		View.StereoPass,
		bUseHmdMesh,
		EDRF_UseTriangleOptimization);
}

void FRCPassPostProcessLensBlur::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, PassPostProcessLensBlur);

	const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);
	
	if(!InputDesc)
	{
		// input is not hooked up correctly
		return;
	}

	const FSceneView& View = Context.View;

	FIntPoint TexSize = InputDesc->Extent;

	// usually 1, 2, 4 or 8
	uint32 ScaleToFullRes = GSceneRenderTargets.GetBufferSizeXY().X / TexSize.X;

	FIntRect ViewRect = FIntRect::DivideAndRoundUp(View.ViewRect, ScaleToFullRes);
	FIntPoint ViewSize = ViewRect.Size();

	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);

	// Set the view family's render target/viewport.
	SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef(), ESimpleRenderTargetMode::EClearColorToBlack);

	Context.SetViewportAndCallRHI(ViewRect);

	// set the state (additive blending)
	Context.RHICmdList.SetBlendState(TStaticBlendState<CW_RGB, BO_Add, BF_One, BF_One>::GetRHI());
	Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
	Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always>::GetRHI());

	TShaderMapRef<FPostProcessLensBlurVS> VertexShader(Context.GetShaderMap());
	TShaderMapRef<FPostProcessLensBlurPS> PixelShader(Context.GetShaderMap());

	static FGlobalBoundShaderState BoundShaderState;
	
	SetGlobalBoundShaderState(Context.RHICmdList, Context.GetFeatureLevel(), BoundShaderState, GEmptyVertexDeclaration.VertexDeclarationRHI, *VertexShader, *PixelShader);

	uint32 TileSize = 1;

	FIntPoint TileCount = ViewSize / TileSize;

	float PixelKernelSize = PercentKernelSize / 100.0f * ViewSize.X;

	VertexShader->SetParameters(Context, TileCount, TileSize, PixelKernelSize, Threshold);
	PixelShader->SetParameters(Context, PixelKernelSize);

	Context.RHICmdList.SetStreamSource(0, NULL, 0, 0);

	// needs to be the same on shader side (faster on NVIDIA and AMD)
	int32 QuadsPerInstance = 4;

	Context.RHICmdList.DrawPrimitive(PT_TriangleList, 0, 2, FMath::DivideAndRoundUp(TileCount.X * TileCount.Y, QuadsPerInstance));

	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}

void FRCPassPostProcessAA::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, PostProcessAA);

	const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);

	if(!InputDesc)
	{
		// input is not hooked up correctly
		return;
	}

	const FSceneView& View = Context.View;
	const FSceneViewFamily& ViewFamily = *(View.Family);

	FIntRect SrcRect = View.ViewRect;
	FIntRect DestRect = View.ViewRect;
	FIntPoint SrcSize = InputDesc->Extent;
	FIntPoint DestSize = PassOutputs[0].RenderTargetDesc.Extent;

	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);

	

	// Set the view family's render target/viewport.
	SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef());
	Context.SetViewportAndCallRHI(0, 0, 0.0f, DestSize.X, DestSize.Y, 1.0f );

	// set the state
	Context.RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
	Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
	Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always>::GetRHI());

	switch(Quality)
	{
		case 1:  SetShaderTemplAA<1>(Context); break;
		case 2:  SetShaderTemplAA<2>(Context); break;
		case 3:  SetShaderTemplAA<3>(Context); break;
		case 4:  SetShaderTemplAA<4>(Context); break;
		case 5:  SetShaderTemplAA<5>(Context); break;
		default: SetShaderTemplAA<6>(Context); break;
	}
	
	// Draw a quad mapping scene color to the view's render target
	TShaderMapRef<FFXAAVS> VertexShader(Context.GetShaderMap());

	DrawRectangle(
		Context.RHICmdList,
		DestRect.Min.X, DestRect.Min.Y,
		DestRect.Width(), DestRect.Height(),
		SrcRect.Min.X, SrcRect.Min.Y,
		SrcRect.Width(), SrcRect.Height(),
		DestSize,
		SrcSize,
		*VertexShader,
		EDRF_Default);

	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}

void FRCPassPostProcessVisualizeLPV::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, VisualizeLPV);

	const FSceneView& View = Context.View;
	const FSceneViewFamily& ViewFamily = *(View.Family);
	
//	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);
	const TRefCountPtr<IPooledRenderTarget> RenderTarget = GetInput(ePId_Input0)->GetOutput()->PooledRenderTarget;
	const FSceneRenderTargetItem& DestRenderTarget = RenderTarget->GetRenderTargetItem();

	// Set the view family's render target/viewport.
	SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef());

	{
		FRenderTargetTemp TempRenderTarget(View, (const FTexture2DRHIRef&)DestRenderTarget.TargetableTexture);
		FCanvas Canvas(&TempRenderTarget, NULL, ViewFamily.CurrentRealTime, ViewFamily.CurrentWorldTime, ViewFamily.DeltaWorldTime, View.GetFeatureLevel());

		float X = 30;
		float Y = 28;
		const float YStep = 14;
		const float ColumnWidth = 250;

		Canvas.DrawShadowedString( X, Y += YStep, TEXT("VisualizeLightPropagationVolume"), GetStatsFont(), FLinearColor(0.2f, 0.2f, 1));

		Y += YStep;

		const FLightPropagationVolumeSettings& Dest = View.FinalPostProcessSettings.BlendableManager.GetSingleFinalDataConst<FLightPropagationVolumeSettings>();

#define ENTRY(name)\
		Canvas.DrawShadowedString( X, Y += YStep, TEXT(#name) TEXT(":"), GetStatsFont(), FLinearColor(1, 1, 1));\
		Canvas.DrawShadowedString( X + ColumnWidth, Y, *FString::Printf(TEXT("%g"), Dest.name), GetStatsFont(), FLinearColor(1, 1, 1));

		ENTRY(LPVIntensity)
		ENTRY(LPVVplInjectionBias)
		ENTRY(LPVSize)
		ENTRY(LPVSecondaryOcclusionIntensity)
		ENTRY(LPVSecondaryBounceIntensity)
		ENTRY(LPVGeometryVolumeBias)
		ENTRY(LPVEmissiveInjectionIntensity)
		ENTRY(LPVDirectionalOcclusionIntensity)
		ENTRY(LPVDirectionalOcclusionRadius)
		ENTRY(LPVDiffuseOcclusionExponent)
		ENTRY(LPVSpecularOcclusionExponent)
		ENTRY(LPVDiffuseOcclusionIntensity)
		ENTRY(LPVSpecularOcclusionIntensity)
#undef ENTRY

		Canvas.Flush_RenderThread(Context.RHICmdList);
	}

	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
	
	// to satify following passws
	FRenderingCompositeOutput* Output = GetOutput(ePId_Output0);
	
	Output->PooledRenderTarget = RenderTarget;
}

void FRCPassPostProcessMorpheus::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, PostProcessMorpheus);
	const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);

	if(!InputDesc)
	{
		// input is not hooked up correctly
		return;
	}

	const FSceneView& View = Context.View;
	const FSceneViewFamily& ViewFamily = *(View.Family);
	
	FIntRect SrcRect = View.ViewRect;
	FIntRect DestRect = View.UnscaledViewRect;
	FIntPoint SrcSize = InputDesc->Extent;

	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);

	// Set the view family's render target/viewport.
	SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef());

	Context.SetViewportAndCallRHI(DestRect);

	// set the state
	Context.RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
	Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
	Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always>::GetRHI());

	TShaderMapRef<FPostProcessMorpheusVS> VertexShader(Context.GetShaderMap());
	TShaderMapRef<FPostProcessMorpheusPS> PixelShader(Context.GetShaderMap());

	static FGlobalBoundShaderState BoundShaderState;
	

	SetGlobalBoundShaderState(Context.RHICmdList, Context.GetFeatureLevel(), BoundShaderState, GFilterVertexDeclaration.VertexDeclarationRHI, *VertexShader, *PixelShader);

	FMatrix QuadTexTransform;
	FMatrix QuadPosTransform = FMatrix::Identity;

	PixelShader->SetPS(Context, SrcRect, SrcSize, View.StereoPass, QuadTexTransform);

	// Draw a quad mapping scene color to the view's render target
	DrawTransformedRectangle(
		Context.RHICmdList,
		0, 0,
		DestRect.Width(), DestRect.Height(),
		QuadPosTransform,
		SrcRect.Min.X, SrcRect.Min.Y,
		SrcRect.Width(), SrcRect.Height(),
		QuadTexTransform,
		DestRect.Size(),
		SrcSize
		);

	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}

void FCompositionLighting::ProcessAfterBasePass(FRHICommandListImmediate& RHICmdList, FViewInfo& View)
{
	check(IsInRenderingThread());
	
	FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);
	// might get renamed to refracted or ...WithAO
	SceneContext.GetSceneColor()->SetDebugName(TEXT("SceneColor"));
	// to be able to observe results with VisualizeTexture

	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.GetSceneColor());
	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.GBufferA);
	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.GBufferB);
	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.GBufferC);
	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.GBufferD);
	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.GBufferE);
	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.GBufferVelocity);
	GRenderTargetPool.VisualizeTexture.SetCheckPoint(RHICmdList, SceneContext.ScreenSpaceAO);
	
	// so that the passes can register themselves to the graph
	{
		FMemMark Mark(FMemStack::Get());
		FRenderingCompositePassContext CompositeContext(RHICmdList, View);

		FPostprocessContext Context(CompositeContext.Graph, View);

		// Add the passes we want to add to the graph (commenting a line means the pass is not inserted into the graph) ----------

		// decals are before AmbientOcclusion so the decal can output a normal that AO is affected by
		if( Context.View.Family->EngineShowFlags.Decals &&
			!Context.View.Family->EngineShowFlags.VisualizeLightCulling)		// decal are distracting when looking at LightCulling
		{
			AddDeferredDecalsBeforeLighting(Context);
		}

		FRenderingCompositeOutputRef AmbientOcclusion;

		if(uint32 Levels = ComputeAmbientOcclusionPassCount(Context))
		{
			AmbientOcclusion = AddPostProcessingAmbientOcclusion(RHICmdList, Context, Levels);
		}

		if(IsAmbientCubemapPassRequired(Context))
		{
			AddPostProcessingAmbientCubemap(Context, AmbientOcclusion);
		}

		// The graph setup should be finished before this line ----------------------------------------

		SCOPED_DRAW_EVENT(RHICmdList, LightCompositionTasks_PreLighting);

		TRefCountPtr<IPooledRenderTarget>& SceneColor = SceneContext.GetSceneColor();

		Context.FinalOutput.GetOutput()->RenderTargetDesc = SceneColor->GetDesc();
		Context.FinalOutput.GetOutput()->PooledRenderTarget = SceneColor;

		CompositeContext.Process(Context.FinalOutput.GetPass(), TEXT("CompositionLighting_AfterBasePass"));
	}
}

void FRCPassPostProcessVisualizeBloomOverlay::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, VisualizeBloomOverlay);

	const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);

	check(InputDesc && "Input is not hooked up correctly");

	const FSceneView& View = Context.View;
	const FSceneViewFamily& ViewFamily = *(View.Family);

	FIntPoint SrcSize = InputDesc->Extent;
	FIntPoint DestSize = PassOutputs[0].RenderTargetDesc.Extent;

	// e.g. 4 means the input texture is 4x smaller than the buffer size
	uint32 ScaleFactor = GSceneRenderTargets.GetBufferSizeXY().X / SrcSize.X;

	FIntRect SrcRect = View.ViewRect / ScaleFactor;
	FIntRect DestRect = SrcRect;

	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);

	SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef());

	// is optimized away if possible (RT size=view size, )
	Context.RHICmdList.Clear(true, FLinearColor(0, 0, 0, 0), false, 1.0f, false, 0, DestRect);

	Context.SetViewportAndCallRHI(0, 0, 0.0f, DestRect.Width(), DestRect.Height(), 1.0f );

	// set the state
	Context.RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
	Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
	Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always>::GetRHI());

	TShaderMapRef<FPostProcessVS> VertexShader(Context.GetShaderMap());
	TShaderMapRef<FPostProcessVisualizeBloomOverlayPS> PixelShader(Context.GetShaderMap());

	static FGlobalBoundShaderState BoundShaderState;

	SetGlobalBoundShaderState(Context.RHICmdList, Context.GetFeatureLevel(), BoundShaderState, GFilterVertexDeclaration.VertexDeclarationRHI, *VertexShader, *PixelShader);

	PixelShader->SetParameters(Context);
	VertexShader->SetParameters(Context);

	// Draw a quad mapping scene color to the view's render target
	DrawRectangle(
		Context.RHICmdList,
		DestRect.Min.X, DestRect.Min.Y,
		DestRect.Width(), DestRect.Height(),
		SrcRect.Min.X, SrcRect.Min.Y,
		SrcRect.Width(), SrcRect.Height(),
		DestRect.Size(),
		SrcSize,
		*VertexShader,
		EDRF_UseTriangleOptimization);

	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}

void FDeferredShadingSceneRenderer::RenderLightShaftBloom(FRHICommandListImmediate& RHICmdList)
{
	if (DoesViewFamilyAllowLightShafts(ViewFamily))
	{
		TRefCountPtr<IPooledRenderTarget> LightShafts0;
		TRefCountPtr<IPooledRenderTarget> LightShafts1;

		for (TSparseArray<FLightSceneInfoCompact>::TConstIterator LightIt(Scene->Lights); LightIt; ++LightIt)
		{
			const FLightSceneInfo* const LightSceneInfo = LightIt->LightSceneInfo;

			if (LightSceneInfo->bEnableLightShaftBloom)
			{
				SCOPED_DRAW_EVENT(RHICmdList, RenderLightShaftBloom);

				// Allocate light shaft render targets on demand, using the pool
				AllocateOrReuseLightShaftRenderTarget(RHICmdList, LightShafts0, TEXT("LightShafts0"));
				AllocateOrReuseLightShaftRenderTarget(RHICmdList, LightShafts1, TEXT("LightShafts1"));

				for (int ViewIndex = 0;ViewIndex < Views.Num();ViewIndex++)
				{
					FViewInfo& View = Views[ViewIndex];

					if (ShouldRenderLightShaftsForLight(View, LightSceneInfo))
					{
						INC_DWORD_STAT(STAT_LightShaftsLights);

						// Generate the bloom source from scene color, masked by depth and downsampled
						DownsamplePass<false>(RHICmdList, View, LightSceneInfo, LightShafts0, LightShafts1);

						FSceneViewState* ViewState = (FSceneViewState*)View.State;
						TRefCountPtr<IPooledRenderTarget>* HistoryState = NULL;

						if (ViewState)
						{
							// Find the previous frame's bloom source for this light
							HistoryState = &ViewState->LightShaftBloomHistoryRTs.FindOrAdd(LightSceneInfo->Proxy->GetLightComponent());
						}

						TRefCountPtr<IPooledRenderTarget> HistoryOutput;

						// Apply temporal AA to the occlusion mask
						// Result will be in HistoryOutput
						ApplyTemporalAA(RHICmdList, View, TEXT("LSBloomHistory"), HistoryState, LightShafts0, HistoryOutput);

						// Apply radial blur passes
						// Send HistoryOutput in as the first pass input only, so it will not be overwritten by any subsequent passes, since it is needed for next frame
						ApplyRadialBlurPasses(RHICmdList, View, LightSceneInfo, HistoryOutput, LightShafts0, LightShafts1);
						
						// Add light shaft bloom to scene color in full res
						ApplyLightShaftBloom(RHICmdList, View, LightSceneInfo, LightShafts0);
					}
				}
			}
		}
	}
}

void FRCPassPostProcessHistogramReduce::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, PostProcessHistogramReduce);
	const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);

	if(!InputDesc)
	{
		// input is not hooked up correctly
		return;
	}

	const FSceneView& View = Context.View;
	const FSceneViewFamily& ViewFamily = *(View.Family);
	
	FIntPoint SrcSize = InputDesc->Extent;
	FIntPoint DestSize = PassOutputs[0].RenderTargetDesc.Extent;

	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);

	// Set the view family's render target/viewport.
	SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef());

	// set the state
	Context.RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
	Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
	Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always>::GetRHI());

	TShaderMapRef<FPostProcessVS> VertexShader(Context.GetShaderMap());
	TShaderMapRef<FPostProcessHistogramReducePS> PixelShader(Context.GetShaderMap());

	static FGlobalBoundShaderState BoundShaderState;
	

	SetGlobalBoundShaderState(Context.RHICmdList, Context.GetFeatureLevel(), BoundShaderState, GFilterVertexDeclaration.VertexDeclarationRHI, *VertexShader, *PixelShader);

	// we currently assume the input is half res, one full res pixel less to avoid getting bilinear filtered input
	FIntPoint GatherExtent = (View.ViewRect.Size() - FIntPoint(1, 1)) / 2;

	uint32 LoopSizeValue = ComputeLoopSize(GatherExtent);

	PixelShader->SetPS(Context, LoopSizeValue);

	DrawPostProcessPass(
		Context.RHICmdList,
		0, 0,
		DestSize.X, DestSize.Y,
		0, 0,
		SrcSize.X, 0,
		DestSize,
		SrcSize,
		*VertexShader,
		View.StereoPass,
		Context.HasHmdMesh(),
		EDRF_UseTriangleOptimization);

	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}

void FRCPassPostProcessVisualizeMotionBlur::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(VisualizeMotionBlur, DEC_SCENE_ITEMS);

	const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);

	if(!InputDesc)
	{
		// input is not hooked up correctly
		return;
	}

	const FSceneView& View = Context.View;

	FIntPoint TexSize = InputDesc->Extent;

	// we assume the input and output is full resolution

	FIntPoint SrcSize = InputDesc->Extent;
	FIntPoint DestSize = PassOutputs[0].RenderTargetDesc.Extent;

	// e.g. 4 means the input texture is 4x smaller than the buffer size
	uint32 ScaleFactor = GSceneRenderTargets.GetBufferSizeXY().X / SrcSize.X;

	FIntRect SrcRect = FIntRect::DivideAndRoundUp(View.ViewRect, ScaleFactor);
	FIntRect DestRect = SrcRect;

	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);

	// Set the view family's render target/viewport.
	RHISetRenderTarget(DestRenderTarget.TargetableTexture, FTextureRHIRef());
	
	// is optimized away if possible (RT size=view size, )
	RHIClear(true, FLinearColor::Black, false, 1.0f, false, 0, SrcRect);

	Context.SetViewportAndCallRHI(SrcRect);

	// set the state
	RHISetBlendState(TStaticBlendState<>::GetRHI());
	RHISetRasterizerState(TStaticRasterizerState<>::GetRHI());
	RHISetDepthStencilState(TStaticDepthStencilState<false,CF_Always>::GetRHI());

	// Quality 0: visualize
	SetMotionBlurShaderTempl<0>(Context);

	// Draw a quad mapping scene color to the view's render target
	DrawRectangle(
		0, 0,
		SrcRect.Width(), SrcRect.Height(),
		SrcRect.Min.X, SrcRect.Min.Y, 
		SrcRect.Width(), SrcRect.Height(),
		SrcRect.Size(),
		SrcSize,
		EDRF_UseTriangleOptimization);

	RHICopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}

/**
 * Initialize scene's views.
 * Check visibility, sort translucent items, etc.
 */
void FForwardShadingSceneRenderer::InitViews(FRHICommandListImmediate& RHICmdList)
{
	SCOPED_DRAW_EVENT(RHICmdList, InitViews);

	SCOPE_CYCLE_COUNTER(STAT_InitViewsTime);

	FILCUpdatePrimTaskData ILCTaskData;
	PreVisibilityFrameSetup(RHICmdList);
	ComputeViewVisibility(RHICmdList);
	PostVisibilityFrameSetup(ILCTaskData);

	bool bDynamicShadows = ViewFamily.EngineShowFlags.DynamicShadows && GetShadowQuality() > 0;

	if (bDynamicShadows && !IsSimpleDynamicLightingEnabled())
	{
		// Setup dynamic shadows.
		InitDynamicShadows(RHICmdList);		
	}

	// if we kicked off ILC update via task, wait and finalize.
	if (ILCTaskData.TaskRef.IsValid())
	{
		Scene->IndirectLightingCache.FinalizeCacheUpdates(Scene, *this, ILCTaskData);
	}

	// initialize per-view uniform buffer.  Pass in shadow info as necessary.
	for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
	{
		const TArray<FProjectedShadowInfo*, SceneRenderingAllocator>* DirectionalLightShadowInfo = nullptr;

		FViewInfo& ViewInfo = Views[ViewIndex];
		FScene* Scene = (FScene*)ViewInfo.Family->Scene;
		if (bDynamicShadows && Scene->SimpleDirectionalLight)
		{
			int32 LightId = Scene->SimpleDirectionalLight->Id;
			if (VisibleLightInfos.IsValidIndex(LightId))
			{
				const FVisibleLightInfo& VisibleLightInfo = VisibleLightInfos[LightId];
				if (VisibleLightInfo.AllProjectedShadows.Num() > 0)
				{
					DirectionalLightShadowInfo = &VisibleLightInfo.AllProjectedShadows;
				}
			}
		}

		// Initialize the view's RHI resources.
		Views[ViewIndex].InitRHIResources(DirectionalLightShadowInfo);
	}

	// Now that the indirect lighting cache is updated, we can update the primitive precomputed lighting buffers.
	UpdatePrimitivePrecomputedLightingBuffers();
	
	OnStartFrame();
}

void FRCPassPostProcessVisualizeComplexity::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, PostProcessVisualizeComplexity);
	const FPooledRenderTargetDesc* InputDesc = GetInputDesc(ePId_Input0);

	if(!InputDesc)
	{
		// input is not hooked up correctly
		return;
	}

	const FSceneView& View = Context.View;
	const FSceneViewFamily& ViewFamily = *(View.Family);
	
	FIntRect SrcRect = View.ViewRect;
	FIntRect DestRect = View.UnscaledViewRect;
	FIntPoint SrcSize = InputDesc->Extent;

	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);

	// Set the view family's render target/viewport.
	SetRenderTarget(Context.RHICmdList, DestRenderTarget.TargetableTexture, FTextureRHIRef());
	Context.SetViewportAndCallRHI(DestRect);

	// turn off culling and blending
	Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<FM_Solid, CM_None>::GetRHI());
	Context.RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());

	// turn off depth reads/writes
	Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<false, CF_Always>::GetRHI());

	//reuse this generic vertex shader
	TShaderMapRef<FShaderComplexityApplyVS> VertexShader(Context.GetShaderMap());
	TShaderMapRef<FShaderComplexityApplyPS> PixelShader(Context.GetShaderMap());

	static FGlobalBoundShaderState ShaderComplexityBoundShaderState;
	
	SetGlobalBoundShaderState(Context.RHICmdList, Context.GetFeatureLevel(), ShaderComplexityBoundShaderState, GFilterVertexDeclaration.VertexDeclarationRHI, *VertexShader, *PixelShader);

	PixelShader->SetParameters(Context, Colors);
	
	DrawRectangle(
		Context.RHICmdList,
		0, 0,
		DestRect.Width(), DestRect.Height(),
		SrcRect.Min.X, SrcRect.Min.Y,
		SrcRect.Width(), SrcRect.Height(),
		DestRect.Size(),
		SrcSize,
		*VertexShader,
		EDRF_UseTriangleOptimization);

	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}

bool FDeferredShadingSceneRenderer::RenderLightMapDensities(FRHICommandListImmediate& RHICmdList)
{
	bool bDirty=0;
	if (Scene->GetFeatureLevel() >= ERHIFeatureLevel::SM4)
	{
		SCOPED_DRAW_EVENT(RHICmdList, LightMapDensity);

		// Draw the scene's emissive and light-map color.
		for(int32 ViewIndex = 0;ViewIndex < Views.Num();ViewIndex++)
		{
			SCOPED_CONDITIONAL_DRAW_EVENTF(RHICmdList, EventView, Views.Num() > 1, TEXT("View%d"), ViewIndex);

			FViewInfo& View = Views[ViewIndex];

			// Opaque blending, depth tests and writes.
			RHICmdList.SetBlendState(TStaticBlendState<>::GetRHI());
			RHICmdList.SetDepthStencilState(TStaticDepthStencilState<true,CF_DepthNearOrEqual>::GetRHI());
			RHICmdList.SetViewport(View.ViewRect.Min.X, View.ViewRect.Min.Y, 0, View.ViewRect.Max.X, View.ViewRect.Max.Y, 1);

			{
				SCOPED_DRAW_EVENT(RHICmdList, Dynamic);

				FLightMapDensityDrawingPolicyFactory::ContextType Context;

				for (int32 MeshBatchIndex = 0; MeshBatchIndex < View.DynamicMeshElements.Num(); MeshBatchIndex++)
				{
					const FMeshBatchAndRelevance& MeshBatchAndRelevance = View.DynamicMeshElements[MeshBatchIndex];

					if (MeshBatchAndRelevance.bHasOpaqueOrMaskedMaterial || ViewFamily.EngineShowFlags.Wireframe)
					{
						const FMeshBatch& MeshBatch = *MeshBatchAndRelevance.Mesh;
						FLightMapDensityDrawingPolicyFactory::DrawDynamicMesh(RHICmdList, View, Context, MeshBatch, false, true, MeshBatchAndRelevance.PrimitiveSceneProxy, MeshBatch.BatchHitProxyId);
					}
				}
			}
		}
	}

	return bDirty;
}