C++ FRenderingCompositePass类代码示例

void FCompositionLighting::ProcessLpvIndirect(FRHICommandListImmediate& RHICmdList, FViewInfo& View)
{
	check(IsInRenderingThread());
	
	FMemMark Mark(FMemStack::Get());
	FRenderingCompositePassContext CompositeContext(RHICmdList, View);
	FPostprocessContext Context(CompositeContext.Graph, View);

	if(IsLpvIndirectPassRequired(Context))
	{
		FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);

		FRenderingCompositePass* SSAO = Context.Graph.RegisterPass(new FRCPassPostProcessInput(SceneContext.ScreenSpaceAO));

		FRenderingCompositePass* Pass = Context.Graph.RegisterPass(new FRCPassPostProcessLpvIndirect());
		Pass->SetInput(ePId_Input0, Context.FinalOutput);
		Pass->SetInput(ePId_Input1, SSAO );

		Context.FinalOutput = FRenderingCompositeOutputRef(Pass);
	}

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

	SCOPED_DRAW_EVENT(RHICmdList, CompositionLpvIndirect);

	// we don't replace the final element with the scenecolor because this is what those passes should do by themself

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

static void AddDeferredDecalsBeforeLighting(FPostprocessContext& Context)
{
	FRenderingCompositePass* Pass = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessDeferredDecals(1));
	Pass->SetInput(ePId_Input0, Context.FinalOutput);

	Context.FinalOutput = FRenderingCompositeOutputRef(Pass);
}

static void AddPostProcessingAmbientCubemap(FPostprocessContext& Context, FRenderingCompositeOutputRef AmbientOcclusion)
{
	FRenderingCompositePass* Pass = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbient());
	Pass->SetInput(ePId_Input0, Context.FinalOutput);
	Pass->SetInput(ePId_Input1, AmbientOcclusion);

	Context.FinalOutput = FRenderingCompositeOutputRef(Pass);
}

// Perform simple upscale and/or editor primitive composite if the fully-featured post process is not in use.
void FForwardShadingSceneRenderer::BasicPostProcess(FRHICommandListImmediate& RHICmdList, FViewInfo &View, bool bDoUpscale, bool bDoEditorPrimitives)
{
	FRenderingCompositePassContext CompositeContext(RHICmdList, View);
	FPostprocessContext Context(RHICmdList, CompositeContext.Graph, View);

	const bool bBlitRequired = !bDoUpscale && !bDoEditorPrimitives;

	if (bDoUpscale || bBlitRequired)
	{	// blit from sceneRT to view family target, simple bilinear if upscaling otherwise point filtered.
		uint32 UpscaleQuality = bDoUpscale ? 1 : 0;
		FRenderingCompositePass* Node = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessUpscale(UpscaleQuality));

		Node->SetInput(ePId_Input0, FRenderingCompositeOutputRef(Context.FinalOutput));
		Node->SetInput(ePId_Input1, FRenderingCompositeOutputRef(Context.FinalOutput));

		Context.FinalOutput = FRenderingCompositeOutputRef(Node);
	}

#if WITH_EDITOR
	// Composite editor primitives if we had any to draw and compositing is enabled
	if (bDoEditorPrimitives)
	{
		FRenderingCompositePass* EditorCompNode = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessCompositeEditorPrimitives(false));
		EditorCompNode->SetInput(ePId_Input0, FRenderingCompositeOutputRef(Context.FinalOutput));
		//Node->SetInput(ePId_Input1, FRenderingCompositeOutputRef(Context.SceneDepth));
		Context.FinalOutput = FRenderingCompositeOutputRef(EditorCompNode);
	}
#endif

	// currently created on the heap each frame but View.Family->RenderTarget could keep this object and all would be cleaner
	TRefCountPtr<IPooledRenderTarget> Temp;
	FSceneRenderTargetItem Item;
	Item.TargetableTexture = (FTextureRHIRef&)View.Family->RenderTarget->GetRenderTargetTexture();
	Item.ShaderResourceTexture = (FTextureRHIRef&)View.Family->RenderTarget->GetRenderTargetTexture();

	FPooledRenderTargetDesc Desc;

	Desc.Extent = View.Family->RenderTarget->GetSizeXY();
	// todo: this should come from View.Family->RenderTarget
	Desc.Format = PF_B8G8R8A8;
	Desc.NumMips = 1;

	GRenderTargetPool.CreateUntrackedElement(Desc, Temp, Item);

	Context.FinalOutput.GetOutput()->PooledRenderTarget = Temp;
	Context.FinalOutput.GetOutput()->RenderTargetDesc = Desc;

	CompositeContext.Process(Context.FinalOutput.GetPass(), TEXT("ES2BasicPostProcess"));
}

// Perform simple upscale and/or editor primitive composite if the fully-featured post process is not in use.
void FForwardShadingSceneRenderer::BasicPostProcess(FRHICommandListImmediate& RHICmdList, FViewInfo &View, bool bDoUpscale, bool bDoEditorPrimitives)
{
	FRenderingCompositePassContext CompositeContext(RHICmdList, View);
	FPostprocessContext Context(CompositeContext.Graph, View);

	if (bDoUpscale)
	{	// simple bilinear upscaling for ES2.
		FRenderingCompositePass* Node = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessUpscale(1, 0.0f));

		Node->SetInput(ePId_Input0, FRenderingCompositeOutputRef(Context.FinalOutput));
		Node->SetInput(ePId_Input1, FRenderingCompositeOutputRef(Context.FinalOutput));

		Context.FinalOutput = FRenderingCompositeOutputRef(Node);
	}

	// Composite editor primitives if we had any to draw and compositing is enabled
	if (bDoEditorPrimitives)
	{
		FRenderingCompositePass* EditorCompNode = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessCompositeEditorPrimitives(false));
		EditorCompNode->SetInput(ePId_Input0, FRenderingCompositeOutputRef(Context.FinalOutput));
		//Node->SetInput(ePId_Input1, FRenderingCompositeOutputRef(Context.SceneDepth));
		Context.FinalOutput = FRenderingCompositeOutputRef(EditorCompNode);
	}

	// currently created on the heap each frame but View.Family->RenderTarget could keep this object and all would be cleaner
	TRefCountPtr<IPooledRenderTarget> Temp;
	FSceneRenderTargetItem Item;
	Item.TargetableTexture = (FTextureRHIRef&)View.Family->RenderTarget->GetRenderTargetTexture();
	Item.ShaderResourceTexture = (FTextureRHIRef&)View.Family->RenderTarget->GetRenderTargetTexture();

	FPooledRenderTargetDesc Desc;

	Desc.Extent = View.Family->RenderTarget->GetSizeXY();
	// todo: this should come from View.Family->RenderTarget
	Desc.Format = PF_B8G8R8A8;
	Desc.NumMips = 1;

	GRenderTargetPool.CreateUntrackedElement(Desc, Temp, Item);

	Context.FinalOutput.GetOutput()->PooledRenderTarget = Temp;
	Context.FinalOutput.GetOutput()->RenderTargetDesc = Desc;

	CompositeContext.Root->AddDependency(Context.FinalOutput);
	CompositeContext.Process(TEXT("ES2BasicPostProcess"));
}

/** Applies Temporal AA to the light shaft source. */
void ApplyTemporalAA(
	FRHICommandListImmediate& RHICmdList,
	FViewInfo& View, 
	const TCHAR* HistoryRTName,
	/** Contains last frame's history, if non-NULL.  This will be updated with the new frame's history. */
	TRefCountPtr<IPooledRenderTarget>* HistoryState,
	/** Source mask (for either occlusion or bloom). */
	TRefCountPtr<IPooledRenderTarget>& LightShaftsSource, 
	/** Output of Temporal AA for the next step in the pipeline. */
	TRefCountPtr<IPooledRenderTarget>& HistoryOutput)
{
	if (View.FinalPostProcessSettings.AntiAliasingMethod == AAM_TemporalAA
		&& HistoryState)
	{
		if (*HistoryState && !View.bCameraCut)
		{
			FMemMark Mark(FMemStack::Get());
			FRenderingCompositePassContext CompositeContext(RHICmdList, View);
			FPostprocessContext Context(CompositeContext.Graph, View);

			// Nodes for input render targets
			FRenderingCompositePass* LightShaftSetup = Context.Graph.RegisterPass( new(FMemStack::Get()) FRCPassPostProcessInput( LightShaftsSource ) );
			FRenderingCompositePass* HistoryInput = Context.Graph.RegisterPass( new(FMemStack::Get()) FRCPassPostProcessInput( *HistoryState ) );

			// Temporal AA node
			FRenderingCompositePass* NodeTemporalAA = Context.Graph.RegisterPass( new(FMemStack::Get()) FRCPassPostProcessLightShaftTemporalAA );

			// Setup inputs on Temporal AA node as the shader expects
			NodeTemporalAA->SetInput( ePId_Input0, LightShaftSetup );
			NodeTemporalAA->SetInput( ePId_Input1, FRenderingCompositeOutputRef( HistoryInput ) );
			NodeTemporalAA->SetInput( ePId_Input2, FRenderingCompositeOutputRef( HistoryInput ) );

			// Reuse a render target from the pool with a consistent name, for vis purposes
			TRefCountPtr<IPooledRenderTarget> NewHistory;
			AllocateOrReuseLightShaftRenderTarget(RHICmdList, NewHistory, HistoryRTName);

			// Setup the output to write to the new history render target
			Context.FinalOutput = FRenderingCompositeOutputRef(NodeTemporalAA);
			Context.FinalOutput.GetOutput()->RenderTargetDesc = NewHistory->GetDesc();
			Context.FinalOutput.GetOutput()->PooledRenderTarget = NewHistory;

			// Execute Temporal AA
			CompositeContext.Process(Context.FinalOutput.GetPass(), TEXT("LightShaftTemporalAA"));

			// Update the view state's render target reference with the new history
			*HistoryState = NewHistory;
			HistoryOutput = NewHistory;
		}
		else
		{
			// Use the current frame's mask for next frame's history, without invoking the Temporal AA shader
			*HistoryState = LightShaftsSource;
			HistoryOutput = LightShaftsSource;
			LightShaftsSource = NULL;

			AllocateOrReuseLightShaftRenderTarget(RHICmdList, LightShaftsSource, HistoryRTName);
		}
	}
	else
	{
		// Temporal AA is disabled or there is no view state - pass through
		HistoryOutput = LightShaftsSource;
	}
}

// @param Levels 0..4, how many different resolution levels we want to render
static FRenderingCompositeOutputRef AddPostProcessingAmbientOcclusion(FRHICommandListImmediate& RHICmdList, FPostprocessContext& Context, uint32 Levels)
{
	check(Levels >= 0 && Levels <= 4);

	FRenderingCompositePass* AmbientOcclusionInMip1 = 0;
	FRenderingCompositePass* AmbientOcclusionInMip2 = 0;
	FRenderingCompositePass* AmbientOcclusionInMip3 = 0;
	FRenderingCompositePass* AmbientOcclusionPassMip1 = 0; 
	FRenderingCompositePass* AmbientOcclusionPassMip2 = 0; 
	FRenderingCompositePass* AmbientOcclusionPassMip3 = 0; 

	// generate input in half, quarter, .. resolution

	AmbientOcclusionInMip1 = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbientOcclusionSetup());
	AmbientOcclusionInMip1->SetInput(ePId_Input0, Context.SceneDepth);

	if(Levels >= 3)
	{
		AmbientOcclusionInMip2 = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbientOcclusionSetup());
		AmbientOcclusionInMip2->SetInput(ePId_Input1, FRenderingCompositeOutputRef(AmbientOcclusionInMip1, ePId_Output0));
	}

	if(Levels >= 4)
	{
		AmbientOcclusionInMip3 = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbientOcclusionSetup());
		AmbientOcclusionInMip3->SetInput(ePId_Input1, FRenderingCompositeOutputRef(AmbientOcclusionInMip2, ePId_Output0));
	}

	FRenderingCompositePass* HZBInput = Context.Graph.RegisterPass( new FRCPassPostProcessInput( const_cast< FViewInfo& >( Context.View ).HZB ) );

	// upsample from lower resolution

	if(Levels >= 4)
	{
		AmbientOcclusionPassMip3 = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbientOcclusion());
		AmbientOcclusionPassMip3->SetInput(ePId_Input0, AmbientOcclusionInMip3);
		AmbientOcclusionPassMip3->SetInput(ePId_Input1, AmbientOcclusionInMip3);
		AmbientOcclusionPassMip3->SetInput(ePId_Input3, HZBInput);
	}

	if(Levels >= 3)
	{
		AmbientOcclusionPassMip2 = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbientOcclusion());
		AmbientOcclusionPassMip2->SetInput(ePId_Input0, AmbientOcclusionInMip2);
		AmbientOcclusionPassMip2->SetInput(ePId_Input1, AmbientOcclusionInMip2);
		AmbientOcclusionPassMip2->SetInput(ePId_Input2, AmbientOcclusionPassMip3);
		AmbientOcclusionPassMip2->SetInput(ePId_Input3, HZBInput);
	}

	if(Levels >= 2)
	{
		AmbientOcclusionPassMip1 = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbientOcclusion());
		AmbientOcclusionPassMip1->SetInput(ePId_Input0, AmbientOcclusionInMip1);
		AmbientOcclusionPassMip1->SetInput(ePId_Input1, AmbientOcclusionInMip1);
		AmbientOcclusionPassMip1->SetInput(ePId_Input2, AmbientOcclusionPassMip2);
		AmbientOcclusionPassMip1->SetInput(ePId_Input3, HZBInput);
	}

	FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);

	FRenderingCompositePass* GBufferA = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessInput(SceneContext.GBufferA));

	// finally full resolution

	FRenderingCompositePass* AmbientOcclusionPassMip0 = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessAmbientOcclusion(false));
	AmbientOcclusionPassMip0->SetInput(ePId_Input0, GBufferA);
	AmbientOcclusionPassMip0->SetInput(ePId_Input1, AmbientOcclusionInMip1);
	AmbientOcclusionPassMip0->SetInput(ePId_Input2, AmbientOcclusionPassMip1);
	AmbientOcclusionPassMip0->SetInput(ePId_Input3, HZBInput);

	// to make sure this pass is processed as well (before), needed to make process decals before computing AO
	AmbientOcclusionInMip1->AddDependency(Context.FinalOutput);

	Context.FinalOutput = FRenderingCompositeOutputRef(AmbientOcclusionPassMip0);

	SceneContext.bScreenSpaceAOIsValid = true;

	if(IsBasePassAmbientOcclusionRequired(Context))
	{
		FRenderingCompositePass* Pass = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessBasePassAO());
		Pass->AddDependency(Context.FinalOutput);

		Context.FinalOutput = FRenderingCompositeOutputRef(Pass);
	}

	return FRenderingCompositeOutputRef(AmbientOcclusionPassMip0);
}

void ScreenSpaceReflections(FRHICommandListImmediate& RHICmdList, FViewInfo& View, TRefCountPtr<IPooledRenderTarget>& SSROutput)
{
	BuildHZB(RHICmdList, View);

	FRenderingCompositePassContext CompositeContext(RHICmdList, View);
	FPostprocessContext Context( CompositeContext.Graph, View );

	FSceneViewState* ViewState = (FSceneViewState*)Context.View.State;

	FRenderingCompositePass* SceneColorInput = Context.Graph.RegisterPass( new FRCPassPostProcessInput( GSceneRenderTargets.GetSceneColor() ) );
	FRenderingCompositePass* HZBInput = Context.Graph.RegisterPass( new FRCPassPostProcessInput( ViewState->HZB.Texture ) );

	bool bPrevFrame = 0;
	if( ViewState && ViewState->TemporalAAHistoryRT && !Context.View.bCameraCut )
	{
		SceneColorInput = Context.Graph.RegisterPass( new FRCPassPostProcessInput( ViewState->TemporalAAHistoryRT ) );
		bPrevFrame = 1;
	}

	{
		FRenderingCompositePass* TracePass = Context.Graph.RegisterPass( new FRCPassPostProcessScreenSpaceReflections( bPrevFrame ) );
		TracePass->SetInput( ePId_Input0, SceneColorInput );
		TracePass->SetInput( ePId_Input1, HZBInput );

		Context.FinalOutput = FRenderingCompositeOutputRef( TracePass );
	}

	const bool bTemporalFilter = View.FinalPostProcessSettings.AntiAliasingMethod != AAM_TemporalAA || CVarSSRTemporal.GetValueOnRenderThread() != 0;

	if( ViewState && bTemporalFilter )
	{
		{
			FRenderingCompositeOutputRef HistoryInput;
			if( ViewState && ViewState->SSRHistoryRT && !Context.View.bCameraCut )
			{
				HistoryInput = Context.Graph.RegisterPass( new FRCPassPostProcessInput( ViewState->SSRHistoryRT ) );
			}
			else
			{
				// No history, use black
				HistoryInput = Context.Graph.RegisterPass(new FRCPassPostProcessInput(GSystemTextures.BlackDummy));
			}

			FRenderingCompositePass* TemporalAAPass = Context.Graph.RegisterPass( new FRCPassPostProcessSSRTemporalAA );
			TemporalAAPass->SetInput( ePId_Input0, Context.FinalOutput );
			TemporalAAPass->SetInput( ePId_Input1, HistoryInput );
			//TemporalAAPass->SetInput( ePId_Input2, VelocityInput );

			Context.FinalOutput = FRenderingCompositeOutputRef( TemporalAAPass );
		}

		if( ViewState )
		{
			FRenderingCompositePass* HistoryOutput = Context.Graph.RegisterPass( new FRCPassPostProcessOutput( &ViewState->SSRHistoryRT ) );
			HistoryOutput->SetInput( ePId_Input0, Context.FinalOutput );

			Context.FinalOutput = FRenderingCompositeOutputRef( HistoryOutput );
		}
	}

	{
		FRenderingCompositePass* ReflectionOutput = Context.Graph.RegisterPass( new FRCPassPostProcessOutput( &SSROutput ) );
		ReflectionOutput->SetInput( ePId_Input0, Context.FinalOutput );

		Context.FinalOutput = FRenderingCompositeOutputRef( ReflectionOutput );
	}

	CompositeContext.Root->AddDependency( Context.FinalOutput );
	CompositeContext.Process(TEXT("ReflectionEnvironments"));
}

void FCompositionLighting::ProcessAfterLighting(FRHICommandListImmediate& RHICmdList, FViewInfo& View)
{
	check(IsInRenderingThread());
	FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);

	{
		FMemMark Mark(FMemStack::Get());
		FRenderingCompositePassContext CompositeContext(RHICmdList, View);
		FPostprocessContext Context(RHICmdList, CompositeContext.Graph, View);
		FRenderingCompositeOutputRef AmbientOcclusion;

		// Screen Space Subsurface Scattering
		{
			float Radius = CVarSSSScale.GetValueOnRenderThread();
			bool bSimpleDynamicLighting = IsAnyForwardShadingEnabled(View.GetShaderPlatform());
			bool bScreenSpaceSubsurfacePassNeeded = ((View.ShadingModelMaskInView & (1 << MSM_SubsurfaceProfile)) != 0) && IsSubsurfacePostprocessRequired();
			bool bSubsurfaceAllowed = CVarSubsurfaceScattering.GetValueOnRenderThread() == 1;

			if (bScreenSpaceSubsurfacePassNeeded 
				&& !bSimpleDynamicLighting 
				&& bSubsurfaceAllowed)
			{
				bool bHalfRes = CVarSSSHalfRes.GetValueOnRenderThread() != 0;
				bool bSingleViewportMode = View.Family->Views.Num() == 1;

				if(Radius > 0 && View.Family->EngineShowFlags.SubsurfaceScattering)
				{
					FRenderingCompositePass* PassSetup = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessSubsurfaceSetup(View, bHalfRes));
					PassSetup->SetInput(ePId_Input0, Context.FinalOutput);

					FRenderingCompositePass* PassX = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessSubsurface(0, bHalfRes));
					PassX->SetInput(ePId_Input0, PassSetup);

					FRenderingCompositePass* PassY = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessSubsurface(1, bHalfRes));
					PassY->SetInput(ePId_Input0, PassX);
					PassY->SetInput(ePId_Input1, PassSetup);

					// full res composite pass, no blurring (Radius=0), replaces SceneColor
					FRenderingCompositePass* RecombinePass = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessSubsurfaceRecombine(bHalfRes, bSingleViewportMode));
					RecombinePass->SetInput(ePId_Input0, Context.FinalOutput);
					RecombinePass->SetInput(ePId_Input1, PassY);
					RecombinePass->SetInput(ePId_Input2, PassSetup);
					Context.FinalOutput = FRenderingCompositeOutputRef(RecombinePass);
				}
				else
				{
					// needed for Scalability
					FRenderingCompositePass* RecombinePass = Context.Graph.RegisterPass(new(FMemStack::Get()) FRCPassPostProcessSubsurfaceRecombine(bHalfRes, bSingleViewportMode));
					RecombinePass->SetInput(ePId_Input0, Context.FinalOutput);
					Context.FinalOutput = FRenderingCompositeOutputRef(RecombinePass);
				}
			}
		}

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

		SCOPED_DRAW_EVENT(RHICmdList, CompositionAfterLighting);
		SCOPED_GPU_STAT(RHICmdList, Stat_GPU_CompositionPostLighting);

		// we don't replace the final element with the scenecolor because this is what those passes should do by themself

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

	// We only release the after the last view was processed (SplitScreen)
	if(View.Family->Views[View.Family->Views.Num() - 1] == &View)
	{
		// The RT should be released as early as possible to allow sharing of that memory for other purposes.
		// This becomes even more important with some limited VRam (XBoxOne).
		SceneContext.SetLightAttenuation(0);
	}
}