C++ FIntRect::InflateRect方法代码示例

	void SetParameters(const FRenderingCompositePassContext& Context)
	{
		const FPixelShaderRHIParamRef ShaderRHI = GetPixelShader();

		FGlobalShader::SetParameters(ShaderRHI, Context.View);

		DeferredParameters.Set(ShaderRHI, Context.View);

		{
			bool bFiltered = false;

#if !(UE_BUILD_SHIPPING || UE_BUILD_TEST)
			static const auto CVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.MotionBlurFiltering"));
			bFiltered = CVar->GetValueOnRenderThread() != 0;
#endif // !(UE_BUILD_SHIPPING || UE_BUILD_TEST)

			if(bFiltered)
			{
				PostprocessParameter.SetPS(ShaderRHI, Context, TStaticSamplerState<SF_Bilinear,AM_Border,AM_Border,AM_Clamp>::GetRHI());
			}
			else
			{
				PostprocessParameter.SetPS(ShaderRHI, Context, TStaticSamplerState<SF_Point,AM_Border,AM_Border,AM_Clamp>::GetRHI());
			}
		}
		
		if( Context.View.Family->EngineShowFlags.CameraInterpolation )
		{
			// Instead of finding the world space position of the current pixel, calculate the world space position offset by the camera position, 
			// then translate by the difference between last frame's camera position and this frame's camera position,
			// then apply the rest of the transforms.  This effectively avoids precision issues near the extents of large levels whose world space position is very large.
			FVector ViewOriginDelta = Context.View.ViewMatrices.ViewOrigin - Context.View.PrevViewMatrices.ViewOrigin;
			SetShaderValue(ShaderRHI, PrevViewProjMatrix, FTranslationMatrix(ViewOriginDelta) * Context.View.PrevViewRotationProjMatrix);
		}
		else
		{
			SetShaderValue( ShaderRHI, PrevViewProjMatrix, Context.View.ViewMatrices.GetViewRotationProjMatrix() );
		}

		TRefCountPtr<IPooledRenderTarget> InputPooledElement = Context.Pass->GetInput(ePId_Input0)->GetOutput()->RequestInput();

		// to mask out samples from outside of the view
		{
			FIntPoint BufferSize = GSceneRenderTargets.GetBufferSizeXY();
			FVector2D InvBufferSize(1.0f / BufferSize.X, 1.0f / BufferSize.Y);

			FIntRect ClipRect = Context.View.ViewRect;

			// to avoid leaking in content from the outside because of bilinear filtering, shrink
			ClipRect.InflateRect(-1);

			FVector2D MinUV(ClipRect.Min.X * InvBufferSize.X, ClipRect.Min.Y * InvBufferSize.Y);
			FVector2D MaxUV(ClipRect.Max.X * InvBufferSize.X, ClipRect.Max.Y * InvBufferSize.Y);
			FVector2D SizeUV = MaxUV - MinUV;

			FVector2D Mul(1.0f / SizeUV.X, 1.0f / SizeUV.Y);
			FVector2D Add = - MinUV * Mul;
			FVector4 TextureViewMadValue(Mul.X, Mul.Y, Add.X, Add.Y);
			SetShaderValue(ShaderRHI, TextureViewMad, TextureViewMadValue);
		}

		{
			const float SizeX = Context.View.ViewRect.Width();
			const float SizeY = Context.View.ViewRect.Height();
			const float AspectRatio = SizeX / SizeY;
			const float InvAspectRatio = SizeY / SizeX;

			const FSceneViewState* ViewState = (FSceneViewState*) Context.View.State;
			float MotionBlurTimeScale = ViewState ? ViewState->MotionBlurTimeScale : 1.0f;

			float ViewMotionBlurScale = 0.5f * MotionBlurTimeScale * Context.View.FinalPostProcessSettings.MotionBlurAmount;

			// MotionBlurInstanceScale was needed to hack some cases where motion blur wasn't working well, this shouldn't be needed any more, can clean this up later
			float MotionBlurInstanceScale = 1;

			float ObjectMotionBlurScale	= MotionBlurInstanceScale * ViewMotionBlurScale;
			// 0:no 1:full screen width, percent conversion
			float MaxVelocity = Context.View.FinalPostProcessSettings.MotionBlurMax / 100.0f;
			float InvMaxVelocity = 1.0f / MaxVelocity;

			// *2 to convert to -1..1 -1..1 screen space
			// / MaxFraction to map screenpos to -1..1 normalized MaxFraction
			FVector4 MotionBlurParametersValue(
				ObjectMotionBlurScale * InvMaxVelocity,
				- ObjectMotionBlurScale * InvMaxVelocity * InvAspectRatio,
				MaxVelocity * 2,
				- MaxVelocity * 2 * AspectRatio);
			SetShaderValue(ShaderRHI, MotionBlurParameters, MotionBlurParametersValue);
		}
	}

void FRCPassPostProcessSelectionOutlineColor::Process(FRenderingCompositePassContext& Context)
{
#if WITH_EDITOR
	SCOPED_DRAW_EVENT(Context.RHICmdList, PostProcessSelectionOutlineBuffer);

	const FPooledRenderTargetDesc* SceneColorInputDesc = GetInputDesc(ePId_Input0);

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

	const FViewInfo& View = Context.View;
	FIntRect ViewRect = View.ViewRect;
	FIntPoint SrcSize = SceneColorInputDesc->Extent;

	// Get the output render target
	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);
	
	// Set the render target/viewport.
	SetRenderTarget(Context.RHICmdList, FTextureRHIParamRef(), DestRenderTarget.TargetableTexture);

	// This is a reversed Z depth surface, so 0.0f is the far plane.
	Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
	Context.SetViewportAndCallRHI(ViewRect);

	if (View.Family->EngineShowFlags.Selection)
	{
		FHitProxyDrawingPolicyFactory::ContextType FactoryContext;

		Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
		Context.RHICmdList.SetBlendState(TStaticBlendStateWriteMask<CW_NONE, CW_NONE, CW_NONE, CW_NONE>::GetRHI());

		// Note that the stencil value will overflow with enough selected objects
		FEditorSelectionDrawingPolicy::ResetStencilValues();

		// Run selection pass on static elements
		FScene* Scene = View.Family->Scene->GetRenderScene();
		if(Scene)
		{	
			Scene->EditorSelectionDrawList.DrawVisible(Context.RHICmdList, View, View.StaticMeshEditorSelectionMap, View.StaticMeshBatchVisibility);
		}
	
		for (int32 MeshBatchIndex = 0; MeshBatchIndex < View.DynamicMeshElements.Num(); MeshBatchIndex++)
		{
			const FMeshBatchAndRelevance& MeshBatchAndRelevance = View.DynamicMeshElements[MeshBatchIndex];
			const FPrimitiveSceneProxy* PrimitiveSceneProxy = MeshBatchAndRelevance.PrimitiveSceneProxy;

			// Selected actors should be subdued if any component is individually selected
			bool bActorSelectionColorIsSubdued = View.bHasSelectedComponents;

			if (PrimitiveSceneProxy->IsSelected() && MeshBatchAndRelevance.Mesh->bUseSelectionOutline && PrimitiveSceneProxy->WantsSelectionOutline())
			{
				int32 StencilValue = 1;
				if(PrimitiveSceneProxy->GetOwnerName() != NAME_BSP)
				{
					StencilValue = FEditorSelectionDrawingPolicy::GetStencilValue(View, PrimitiveSceneProxy);

				}

				// Note that the stencil value will overflow with enough selected objects
				Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<true, CF_DepthNearOrEqual, true, CF_Always, SO_Keep, SO_Keep, SO_Replace>::GetRHI(), StencilValue);

				const FMeshBatch& MeshBatch = *MeshBatchAndRelevance.Mesh;
				FHitProxyDrawingPolicyFactory::DrawDynamicMesh(Context.RHICmdList, View, FactoryContext, MeshBatch, false, true, MeshBatchAndRelevance.PrimitiveSceneProxy, MeshBatch.BatchHitProxyId);
			}
		}

		// to get an outline around the objects if it's partly outside of the screen
		{
			FIntRect InnerRect = ViewRect;

			// 1 as we have an outline that is that thick
			InnerRect.InflateRect(-1);

			// We could use Clear with InnerRect but this is just an optimization - on some hardware it might do a full clear (and we cannot disable yet)
			//			RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, 0.0f, true, 0, InnerRect);
			// so we to 4 clears - one for each border.

			// top
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, ViewRect.Min.Y, ViewRect.Max.X, InnerRect.Min.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
			// bottom
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, InnerRect.Max.Y, ViewRect.Max.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
			// left
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, ViewRect.Min.Y, InnerRect.Min.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
			// right
			Context.RHICmdList.SetScissorRect(true, InnerRect.Max.X, ViewRect.Min.Y, ViewRect.Max.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());

			Context.RHICmdList.SetScissorRect(false, 0, 0, 0, 0);
		}
	}
	
	// Resolve to the output
	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
#endif	
//.........这里部分代码省略.........

void FRCPassPostProcessSelectionOutlineColor::Process(FRenderingCompositePassContext& Context)
{
	SCOPED_DRAW_EVENT(Context.RHICmdList, PostProcessSelectionOutlineBuffer);

	const FPooledRenderTargetDesc* SceneColorInputDesc = GetInputDesc(ePId_Input0);

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

	const FViewInfo& View = Context.View;
	FIntRect ViewRect = View.ViewRect;
	FIntPoint SrcSize = SceneColorInputDesc->Extent;

	// Get the output render target
	const FSceneRenderTargetItem& DestRenderTarget = PassOutputs[0].RequestSurface(Context);
	
	// Set the render target/viewport.
	SetRenderTarget(Context.RHICmdList, FTextureRHIParamRef(), DestRenderTarget.TargetableTexture);
	// This is a reversed Z depth surface, so 0.0f is the far plane.
	Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
	Context.SetViewportAndCallRHI(ViewRect);

	if (View.Family->EngineShowFlags.Selection)
	{
		FHitProxyDrawingPolicyFactory::ContextType FactoryContext;

		//@todo - use memstack
		TMap<FName, int32> ActorNameToStencilIndex;
		TMap<const FPrimitiveSceneProxy*, int32> IndividuallySelectedProxies;
		ActorNameToStencilIndex.Add(NAME_BSP, 1);

		Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
		Context.RHICmdList.SetBlendState(TStaticBlendStateWriteMask<CW_NONE, CW_NONE, CW_NONE, CW_NONE>::GetRHI());

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

#if WITH_EDITOR
			// Selected actors should be subdued if any component is individually selected
			bool bActorSelectionColorIsSubdued = View.bHasSelectedComponents;
#else
			bool bActorSelectionColorIsSubdued = false;
#endif
			if (PrimitiveSceneProxy->IsSelected() && MeshBatchAndRelevance.Mesh->bUseSelectionOutline)
			{
				const int32* AssignedStencilIndexPtr = PrimitiveSceneProxy->IsIndividuallySelected() ? IndividuallySelectedProxies.Find( PrimitiveSceneProxy ) : ActorNameToStencilIndex.Find(PrimitiveSceneProxy->GetOwnerName());

				if (!AssignedStencilIndexPtr)
				{
					if( PrimitiveSceneProxy->IsIndividuallySelected() )
					{
						// Any component that is individually selected should have a stencil value of < 128 so that it can have a unique color.  We offset the value by 2 because 0 means no selection and 1 is for bsp
						int32 StencilValue = IndividuallySelectedProxies.Num() % 126 + 2;
						AssignedStencilIndexPtr = &IndividuallySelectedProxies.Add(PrimitiveSceneProxy, StencilValue);
					}
					else
					{
						// If we are subduing actor color highlight then use the top level bits to indicate that to the shader.  
						int32 StencilValue = bActorSelectionColorIsSubdued ? ActorNameToStencilIndex.Num() % 128 + 128 : ActorNameToStencilIndex.Num() % 126 + 2;
						AssignedStencilIndexPtr = &ActorNameToStencilIndex.Add(PrimitiveSceneProxy->GetOwnerName(), StencilValue);
					}
				}

				// Note that the stencil value will overflow with enough selected objects
				Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<true, CF_DepthNearOrEqual, true, CF_Always, SO_Keep, SO_Keep, SO_Replace>::GetRHI(), *AssignedStencilIndexPtr);

				const FMeshBatch& MeshBatch = *MeshBatchAndRelevance.Mesh;
				FHitProxyDrawingPolicyFactory::DrawDynamicMesh(Context.RHICmdList, View, FactoryContext, MeshBatch, false, true, MeshBatchAndRelevance.PrimitiveSceneProxy, MeshBatch.BatchHitProxyId);
			}
		}
		
		// to get an outline around the objects if it's partly outside of the screen
		{
			FIntRect InnerRect = ViewRect;

			// 1 as we have an outline that is that thick
			InnerRect.InflateRect(-1);

			// We could use Clear with InnerRect but this is just an optimization - on some hardware it might do a full clear (and we cannot disable yet)
			//			RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, 0.0f, true, 0, InnerRect);
			// so we to 4 clears - one for each border.

			// top
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, ViewRect.Min.Y, ViewRect.Max.X, InnerRect.Min.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
			// bottom
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, InnerRect.Max.Y, ViewRect.Max.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
			// left
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, ViewRect.Min.Y, InnerRect.Min.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());
			// right
			Context.RHICmdList.SetScissorRect(true, InnerRect.Max.X, ViewRect.Min.Y, ViewRect.Max.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, (float)ERHIZBuffer::FarPlane, true, 0, FIntRect());

//.........这里部分代码省略.........

//.........这里部分代码省略.........
					}

					// This is a reversed Z depth surface, using CF_GreaterEqual.
					// Note that the stencil value will overflow with enough selected objects
					Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<true, CF_GreaterEqual, true, CF_Always, SO_Keep, SO_Keep, SO_Replace>::GetRHI(), *AssignedStencilIndexPtr);

					const FMeshBatch& MeshBatch = *MeshBatchAndRelevance.Mesh;
					FHitProxyDrawingPolicyFactory::DrawDynamicMesh(Context.RHICmdList, View, FactoryContext, MeshBatch, false, true, MeshBatchAndRelevance.PrimitiveSceneProxy, MeshBatch.BatchHitProxyId);
				}
			}
		}
		else if (View.VisibleDynamicPrimitives.Num() > 0)
		{
			TDynamicPrimitiveDrawer<FHitProxyDrawingPolicyFactory> Drawer(Context.RHICmdList, &View, FHitProxyDrawingPolicyFactory::ContextType(), true, false, false, true);
			TMultiMap<FName, const FPrimitiveSceneInfo*> PrimitivesByActor;

			for (int32 PrimitiveIndex = 0; PrimitiveIndex < View.VisibleDynamicPrimitives.Num();PrimitiveIndex++)
			{
				const FPrimitiveSceneInfo* PrimitiveSceneInfo = View.VisibleDynamicPrimitives[PrimitiveIndex];

				// Only draw the primitive if relevant
				if(PrimitiveSceneInfo->Proxy->IsSelected())
				{
					PrimitivesByActor.Add(PrimitiveSceneInfo->Proxy->GetOwnerName(), PrimitiveSceneInfo);
				}
			}

			if (PrimitivesByActor.Num())
			{
				// 0 means no object, 1 means BSP so we start with 2
				uint32 StencilValue = 2;

				Context.RHICmdList.SetRasterizerState(TStaticRasterizerState<>::GetRHI());
				Context.RHICmdList.SetBlendState(TStaticBlendStateWriteMask<CW_NONE, CW_NONE, CW_NONE, CW_NONE>::GetRHI());

				// Sort by actor
				TArray<FName> Actors;
				PrimitivesByActor.GetKeys(Actors);
				for( TArray<FName>::TConstIterator ActorIt(Actors); ActorIt; ++ActorIt )
				{
					bool bBSP = *ActorIt == NAME_BSP;
					if (bBSP)
					{
						// This is a reversed Z depth surface, using CF_GreaterEqual.
						Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<true, CF_GreaterEqual, true, CF_Always, SO_Keep, SO_Keep, SO_Replace>::GetRHI(), 1);
					}
					else
					{
						// This is a reversed Z depth surface, using CF_GreaterEqual.
						Context.RHICmdList.SetDepthStencilState(TStaticDepthStencilState<true, CF_GreaterEqual, true, CF_Always, SO_Keep, SO_Keep, SO_Replace>::GetRHI(), StencilValue);

						// we want to use 1..255 for all objects, not correct silhouettes after that is acceptable
						StencilValue = (StencilValue == 255) ? 2 : (StencilValue + 1);
					}

					TArray<const FPrimitiveSceneInfo*> Primitives;
					PrimitivesByActor.MultiFind(*ActorIt, Primitives);

					for( TArray<const FPrimitiveSceneInfo*>::TConstIterator PrimIt(Primitives); PrimIt; ++PrimIt )
					{
						const FPrimitiveSceneInfo* PrimitiveSceneInfo = *PrimIt;
						// Render the object to the stencil/depth buffer
						Drawer.SetPrimitive(PrimitiveSceneInfo->Proxy);
						PrimitiveSceneInfo->Proxy->DrawDynamicElements(&Drawer, &View);
					}
				}
			}
		}

		// to get an outline around the objects if it's partly outside of the screen
		{
			FIntRect InnerRect = ViewRect;

			// 1 as we have an outline that is that thick
			InnerRect.InflateRect(-1);

			// We could use Clear with InnerRect but this is just an optimization - on some hardware it might do a full clear (and we cannot disable yet)
			//			RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, 0.0f, true, 0, InnerRect);
			// so we to 4 clears - one for each border.

			// top
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, ViewRect.Min.Y, ViewRect.Max.X, InnerRect.Min.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, 0.0f, true, 0, FIntRect());
			// bottom
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, InnerRect.Max.Y, ViewRect.Max.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, 0.0f, true, 0, FIntRect());
			// left
			Context.RHICmdList.SetScissorRect(true, ViewRect.Min.X, ViewRect.Min.Y, InnerRect.Min.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, 0.0f, true, 0, FIntRect());
			// right
			Context.RHICmdList.SetScissorRect(true, InnerRect.Max.X, ViewRect.Min.Y, ViewRect.Max.X, ViewRect.Max.Y);
			Context.RHICmdList.Clear(false, FLinearColor(0, 0, 0, 0), true, 0.0f, true, 0, FIntRect());

			Context.RHICmdList.SetScissorRect(false, 0, 0, 0, 0);
		}
	}
	
	// Resolve to the output
	Context.RHICmdList.CopyToResolveTarget(DestRenderTarget.TargetableTexture, DestRenderTarget.ShaderResourceTexture, false, FResolveParams());
}