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#rb none #jira UE-76364 #ROBOMERGE-SOURCE: CL 7046967 in //UE4/Release-4.23/... #ROBOMERGE-BOT: RELEASE (Release-4.23 -> Main) (v367-6836689) [CL 7047009 by rolando caloca in Main branch]
800 lines
31 KiB
C++
800 lines
31 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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PostProcessSubsurface.cpp: Screenspace subsurface scattering implementation.
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=============================================================================*/
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#include "PostProcess/PostProcessSubsurface.h"
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#include "PostProcess/SceneRenderTargets.h"
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#include "Engine/SubsurfaceProfile.h"
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#include "CanvasTypes.h"
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#include "RenderTargetTemp.h"
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ENGINE_API IPooledRenderTarget* GetSubsufaceProfileTexture_RT(FRHICommandListImmediate& RHICmdList);
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namespace
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{
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TAutoConsoleVariable<int32> CVarSubsurfaceScattering(
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TEXT("r.SubsurfaceScattering"),
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1,
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TEXT(" 0: disabled\n")
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TEXT(" 1: enabled (default)"),
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ECVF_RenderThreadSafe | ECVF_Scalability);
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TAutoConsoleVariable<float> CVarSSSScale(
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TEXT("r.SSS.Scale"),
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1.0f,
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TEXT("Affects the Screen space subsurface scattering pass")
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TEXT("(use shadingmodel SubsurfaceProfile, get near to the object as the default)\n")
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TEXT("is human skin which only scatters about 1.2cm)\n")
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TEXT(" 0: off (if there is no object on the screen using this pass it should automatically disable the post process pass)\n")
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TEXT("<1: scale scatter radius down (for testing)\n")
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TEXT(" 1: use given radius form the Subsurface scattering asset (default)\n")
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TEXT(">1: scale scatter radius up (for testing)"),
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ECVF_Scalability | ECVF_RenderThreadSafe);
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TAutoConsoleVariable<int32> CVarSSSHalfRes(
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TEXT("r.SSS.HalfRes"),
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1,
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TEXT(" 0: full quality (not optimized, as reference)\n")
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TEXT(" 1: parts of the algorithm runs in half resolution which is lower quality but faster (default)"),
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ECVF_RenderThreadSafe | ECVF_Scalability);
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TAutoConsoleVariable<int32> CVarSSSQuality(
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TEXT("r.SSS.Quality"),
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0,
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TEXT("Defines the quality of the recombine pass when using the SubsurfaceScatteringProfile shading model\n")
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TEXT(" 0: low (faster, default)\n")
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TEXT(" 1: high (sharper details but slower)\n")
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TEXT("-1: auto, 1 if TemporalAA is disabled (without TemporalAA the quality is more noticable)"),
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ECVF_RenderThreadSafe | ECVF_Scalability);
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TAutoConsoleVariable<int32> CVarSSSFilter(
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TEXT("r.SSS.Filter"),
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1,
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TEXT("Defines the filter method for Screenspace Subsurface Scattering feature.\n")
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TEXT(" 0: point filter (useful for testing, could be cleaner)\n")
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TEXT(" 1: bilinear filter"),
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ECVF_RenderThreadSafe | ECVF_Scalability);
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TAutoConsoleVariable<int32> CVarSSSSampleSet(
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TEXT("r.SSS.SampleSet"),
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2,
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TEXT("Defines how many samples we use for Screenspace Subsurface Scattering feature.\n")
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TEXT(" 0: lowest quality (6*2+1)\n")
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TEXT(" 1: medium quality (9*2+1)\n")
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TEXT(" 2: high quality (13*2+1) (default)"),
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ECVF_RenderThreadSafe | ECVF_Scalability);
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TAutoConsoleVariable<int32> CVarSSSCheckerboard(
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TEXT("r.SSS.Checkerboard"),
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2,
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TEXT("Enables or disables checkerboard rendering for subsurface profile rendering.\n")
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TEXT("This is necessary if SceneColor does not include a floating point alpha channel (e.g 32-bit formats)\n")
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TEXT(" 0: Disabled (high quality) \n")
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TEXT(" 1: Enabled (low quality). Surface lighting will be at reduced resolution.\n")
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TEXT(" 2: Automatic. Non-checkerboard lighting will be applied if we have a suitable rendertarget format\n"),
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ECVF_RenderThreadSafe);
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}
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enum class ESubsurfaceMode : uint32
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{
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// Performs a full resolution scattering filter.
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FullRes,
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// Performs a half resolution scattering filter.
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HalfRes,
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// Reconstructs lighting, but does not perform scattering.
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Bypass,
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MAX
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};
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// Returns the [0, N] clamped value of the 'r.SSS.Scale' CVar.
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float GetSubsurfaceRadiusScale()
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{
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static const auto CVar = IConsoleManager::Get().FindTConsoleVariableDataFloat(TEXT("r.SSS.Scale"));
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check(CVar);
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return FMath::Max(0.0f, CVar->GetValueOnRenderThread());
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}
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// Returns the current subsurface mode required by the current view.
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ESubsurfaceMode GetSubsurfaceModeForView(const FViewInfo& View)
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{
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const float Radius = GetSubsurfaceRadiusScale();
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const bool bShowSubsurfaceScattering = Radius > 0 && View.Family->EngineShowFlags.SubsurfaceScattering;
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if (bShowSubsurfaceScattering)
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{
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const bool bHalfRes = CVarSSSHalfRes.GetValueOnRenderThread() != 0;
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if (bHalfRes)
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{
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return ESubsurfaceMode::HalfRes;
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}
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else
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{
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return ESubsurfaceMode::FullRes;
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}
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}
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else
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{
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return ESubsurfaceMode::Bypass;
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}
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}
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bool IsSubsurfaceEnabled()
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{
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const bool bEnabled = CVarSubsurfaceScattering.GetValueOnAnyThread() != 0;
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const bool bHasScale = CVarSSSScale.GetValueOnAnyThread() > 0.0f;
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return (bEnabled && bHasScale);
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}
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bool IsSubsurfaceRequiredForView(const FViewInfo& View)
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{
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const bool bSimpleDynamicLighting = IsAnyForwardShadingEnabled(View.GetShaderPlatform());
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const bool bSubsurfaceEnabled = IsSubsurfaceEnabled();
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const bool bViewHasSubsurfaceMaterials = ((View.ShadingModelMaskInView & GetUseSubsurfaceProfileShadingModelMask()) != 0);
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return (bSubsurfaceEnabled && bViewHasSubsurfaceMaterials && !bSimpleDynamicLighting);
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}
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uint32 GetSubsurfaceRequiredViewMask(const TArray<FViewInfo>& Views)
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{
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const uint32 ViewCount = Views.Num();
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uint32 ViewMask = 0;
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// Traverse the views to make sure we only process subsurface if requested by any view.
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for (uint32 ViewIndex = 0; ViewIndex < ViewCount; ++ViewIndex)
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{
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const FViewInfo& View = Views[ViewIndex];
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if (IsSubsurfaceRequiredForView(View))
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{
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const uint32 ViewBit = 1 << ViewIndex;
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ViewMask |= ViewBit;
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}
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}
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return ViewMask;
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}
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bool IsSubsurfaceCheckerboardFormat(EPixelFormat SceneColorFormat)
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{
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int CVarValue = CVarSSSCheckerboard.GetValueOnRenderThread();
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if (CVarValue == 0)
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{
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return false;
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}
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else if (CVarValue == 1)
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{
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return true;
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}
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else if (CVarValue == 2)
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{
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switch (SceneColorFormat)
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{
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case PF_A32B32G32R32F:
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case PF_FloatRGBA:
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return false;
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default:
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return true;
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}
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}
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return true;
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}
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// Returns the SS profile texture with a black fallback texture if none exists yet.
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FTextureRHIRef GetSubsurfaceProfileTexture(FRHICommandListImmediate& RHICmdList)
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{
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const IPooledRenderTarget* ProfileTextureTarget = GetSubsufaceProfileTexture_RT(RHICmdList);
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if (!ProfileTextureTarget)
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{
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// No subsurface profile was used yet
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ProfileTextureTarget = GSystemTextures.BlackDummy;
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}
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return ProfileTextureTarget->GetRenderTargetItem().ShaderResourceTexture;
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}
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// Set of common shader parameters shared by all subsurface shaders.
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BEGIN_SHADER_PARAMETER_STRUCT(FSubsurfaceParameters, )
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SHADER_PARAMETER(FVector4, SubsurfaceParams)
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SHADER_PARAMETER_STRUCT_REF(FSceneTexturesUniformParameters, SceneUniformBuffer)
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SHADER_PARAMETER_STRUCT_REF(FViewUniformShaderParameters, ViewUniformBuffer)
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SHADER_PARAMETER_SAMPLER(SamplerState, BilinearTextureSampler)
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SHADER_PARAMETER_TEXTURE(Texture2D, SSProfilesTexture)
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END_SHADER_PARAMETER_STRUCT()
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FSubsurfaceParameters GetSubsurfaceCommonParameters(FRHICommandListImmediate& RHICmdList, const FViewInfo& View)
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{
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FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);
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const float DistanceToProjectionWindow = View.ViewMatrices.GetProjectionMatrix().M[0][0];
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const float SSSScaleZ = DistanceToProjectionWindow * GetSubsurfaceRadiusScale();
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const float SSSScaleX = SSSScaleZ / SUBSURFACE_KERNEL_SIZE * 0.5f;
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FSubsurfaceParameters Parameters;
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Parameters.SubsurfaceParams = FVector4(SSSScaleX, SSSScaleZ, 0, 0);
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Parameters.ViewUniformBuffer = View.ViewUniformBuffer;
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Parameters.SceneUniformBuffer = CreateSceneTextureUniformBuffer(
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SceneContext, View.FeatureLevel, ESceneTextureSetupMode::All, EUniformBufferUsage::UniformBuffer_SingleFrame);
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Parameters.BilinearTextureSampler = TStaticSamplerState<SF_Bilinear>::GetRHI();
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Parameters.SSProfilesTexture = GetSubsurfaceProfileTexture(RHICmdList);
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return Parameters;
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}
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// A shader parameter struct for a single subsurface input texture.
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BEGIN_SHADER_PARAMETER_STRUCT(FSubsurfaceInput, )
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SHADER_PARAMETER_STRUCT_INCLUDE(FScreenPassTextureViewportParameters, Viewport)
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SHADER_PARAMETER_RDG_TEXTURE(Texture2D, Texture)
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END_SHADER_PARAMETER_STRUCT()
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FSubsurfaceInput GetSubsurfaceInput(FRDGTextureRef Texture, const FScreenPassTextureViewportParameters& ViewportParameters)
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{
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FSubsurfaceInput Input;
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Input.Texture = Texture;
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Input.Viewport = ViewportParameters;
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return Input;
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}
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// Base class for a subsurface shader.
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class FSubsurfaceShader : public FGlobalShader
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{
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public:
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static bool ShouldCompilePermutation(const FGlobalShaderPermutationParameters& Parameters)
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{
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return IsFeatureLevelSupported(Parameters.Platform, ERHIFeatureLevel::SM4);
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}
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static void ModifyCompilationEnvironment(const FGlobalShaderPermutationParameters& Parameters, FShaderCompilerEnvironment& OutEnvironment)
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{
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FGlobalShader::ModifyCompilationEnvironment(Parameters, OutEnvironment);
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OutEnvironment.SetDefine(TEXT("SUBSURFACE_RADIUS_SCALE"), SUBSURFACE_RADIUS_SCALE);
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OutEnvironment.SetDefine(TEXT("SUBSURFACE_KERNEL_SIZE"), SUBSURFACE_KERNEL_SIZE);
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}
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FSubsurfaceShader() = default;
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FSubsurfaceShader(const ShaderMetaType::CompiledShaderInitializerType& Initializer)
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: FGlobalShader(Initializer)
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{}
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};
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// Encapsulates the post processing subsurface scattering pixel shader.
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class FSubsurfaceVisualizePS : public FSubsurfaceShader
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{
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public:
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DECLARE_GLOBAL_SHADER(FSubsurfaceVisualizePS);
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SHADER_USE_PARAMETER_STRUCT(FSubsurfaceVisualizePS, FSubsurfaceShader);
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BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
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SHADER_PARAMETER_STRUCT_INCLUDE(FSubsurfaceParameters, Subsurface)
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SHADER_PARAMETER_STRUCT(FSubsurfaceInput, SubsurfaceInput0)
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SHADER_PARAMETER_TEXTURE(Texture2D, MiniFontTexture)
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SHADER_PARAMETER_SAMPLER(SamplerState, SubsurfaceSampler0)
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RENDER_TARGET_BINDING_SLOTS()
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END_SHADER_PARAMETER_STRUCT()
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};
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IMPLEMENT_GLOBAL_SHADER(FSubsurfaceVisualizePS, "/Engine/Private/PostProcessSubsurface.usf", "VisualizePS", SF_Pixel);
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// Encapsulates the post processing subsurface scattering pixel shader.
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class FSubsurfaceSetupPS : public FSubsurfaceShader
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{
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public:
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DECLARE_GLOBAL_SHADER(FSubsurfaceSetupPS);
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SHADER_USE_PARAMETER_STRUCT(FSubsurfaceSetupPS, FSubsurfaceShader)
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BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
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SHADER_PARAMETER_STRUCT_INCLUDE(FSubsurfaceParameters, Subsurface)
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SHADER_PARAMETER_STRUCT(FSubsurfaceInput, SubsurfaceInput0)
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SHADER_PARAMETER_SAMPLER(SamplerState, SubsurfaceSampler0)
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RENDER_TARGET_BINDING_SLOTS()
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END_SHADER_PARAMETER_STRUCT()
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class FDimensionHalfRes : SHADER_PERMUTATION_BOOL("SUBSURFACE_HALF_RES");
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class FDimensionCheckerboard : SHADER_PERMUTATION_BOOL("SUBSURFACE_PROFILE_CHECKERBOARD");
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using FPermutationDomain = TShaderPermutationDomain<FDimensionHalfRes, FDimensionCheckerboard>;
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};
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IMPLEMENT_GLOBAL_SHADER(FSubsurfaceSetupPS, "/Engine/Private/PostProcessSubsurface.usf", "SetupPS", SF_Pixel);
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// Shader for the SSS separable blur.
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class FSubsurfacePS : public FSubsurfaceShader
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{
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public:
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DECLARE_GLOBAL_SHADER(FSubsurfacePS);
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SHADER_USE_PARAMETER_STRUCT(FSubsurfacePS, FSubsurfaceShader);
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BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
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SHADER_PARAMETER_STRUCT_INCLUDE(FSubsurfaceParameters, Subsurface)
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SHADER_PARAMETER_STRUCT(FSubsurfaceInput, SubsurfaceInput0)
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SHADER_PARAMETER_SAMPLER(SamplerState, SubsurfaceSampler0)
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RENDER_TARGET_BINDING_SLOTS()
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END_SHADER_PARAMETER_STRUCT()
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// Direction of the 1D separable filter.
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enum class EDirection : uint32
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{
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Horizontal,
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Vertical,
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MAX
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};
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// Controls the quality (number of samples) of the blur kernel.
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enum class EQuality : uint32
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{
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Low,
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Medium,
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High,
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MAX
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};
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class FDimensionDirection : SHADER_PERMUTATION_ENUM_CLASS("SUBSURFACE_DIRECTION", EDirection);
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class FDimensionQuality : SHADER_PERMUTATION_ENUM_CLASS("SUBSURFACE_QUALITY", EQuality);
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using FPermutationDomain = TShaderPermutationDomain<FDimensionDirection, FDimensionQuality>;
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// Returns the sampler state based on the requested SSS filter CVar setting.
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static FRHISamplerState* GetSamplerState()
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{
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if (CVarSSSFilter.GetValueOnRenderThread())
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{
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return TStaticSamplerState<SF_Bilinear, AM_Border, AM_Border, AM_Border>::GetRHI();
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}
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else
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{
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return TStaticSamplerState<SF_Point, AM_Border, AM_Border, AM_Border>::GetRHI();
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}
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}
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// Returns the SSS quality level requested by the SSS SampleSet CVar setting.
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static EQuality GetQuality()
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{
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return static_cast<FSubsurfacePS::EQuality>(
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FMath::Clamp(
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CVarSSSSampleSet.GetValueOnRenderThread(),
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static_cast<int32>(FSubsurfacePS::EQuality::Low),
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static_cast<int32>(FSubsurfacePS::EQuality::High)));
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}
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};
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IMPLEMENT_GLOBAL_SHADER(FSubsurfacePS, "/Engine/Private/PostProcessSubsurface.usf", "MainPS", SF_Pixel);
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// Encapsulates the post processing subsurface recombine pixel shader.
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class FSubsurfaceRecombinePS : public FSubsurfaceShader
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{
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DECLARE_GLOBAL_SHADER(FSubsurfaceRecombinePS);
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SHADER_USE_PARAMETER_STRUCT(FSubsurfaceRecombinePS, FSubsurfaceShader);
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BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
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SHADER_PARAMETER_STRUCT_INCLUDE(FSubsurfaceParameters, Subsurface)
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SHADER_PARAMETER_STRUCT(FSubsurfaceInput, SubsurfaceInput0)
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SHADER_PARAMETER_STRUCT(FSubsurfaceInput, SubsurfaceInput1)
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SHADER_PARAMETER_SAMPLER(SamplerState, SubsurfaceSampler0)
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SHADER_PARAMETER_SAMPLER(SamplerState, SubsurfaceSampler1)
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RENDER_TARGET_BINDING_SLOTS()
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END_SHADER_PARAMETER_STRUCT();
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// Controls the quality of lighting reconstruction.
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enum class EQuality : uint32
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{
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Low,
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High,
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MAX
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};
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class FDimensionMode : SHADER_PERMUTATION_ENUM_CLASS("SUBSURFACE_RECOMBINE_MODE", ESubsurfaceMode);
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class FDimensionQuality : SHADER_PERMUTATION_ENUM_CLASS("SUBSURFACE_RECOMBINE_QUALITY", EQuality);
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class FDimensionCheckerboard : SHADER_PERMUTATION_BOOL("SUBSURFACE_PROFILE_CHECKERBOARD");
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using FPermutationDomain = TShaderPermutationDomain<FDimensionMode, FDimensionQuality, FDimensionCheckerboard>;
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// Returns the Recombine quality level requested by the SSS Quality CVar setting.
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static EQuality GetQuality(const FViewInfo& View)
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{
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const uint32 QualityCVar = CVarSSSQuality.GetValueOnRenderThread();
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// Quality is forced to high when the CVar is set to 'auto' and TAA is NOT enabled.
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// TAA improves quality through temporal filtering, making it less necessary to use
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// high quality mode.
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const bool bUseHighQuality = (QualityCVar == -1 && View.AntiAliasingMethod != AAM_TemporalAA);
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if (QualityCVar == 1 || bUseHighQuality)
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{
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return EQuality::High;
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}
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else
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{
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return EQuality::Low;
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}
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}
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};
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IMPLEMENT_GLOBAL_SHADER(FSubsurfaceRecombinePS, "/Engine/Private/PostProcessSubsurface.usf", "SubsurfaceRecombinePS", SF_Pixel);
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// Encapsulates a simple copy pixel shader.
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class FSubsurfaceViewportCopyPS : public FSubsurfaceShader
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{
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DECLARE_GLOBAL_SHADER(FSubsurfaceViewportCopyPS);
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SHADER_USE_PARAMETER_STRUCT(FSubsurfaceViewportCopyPS, FSubsurfaceShader);
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BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
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SHADER_PARAMETER_RDG_TEXTURE(Texture2D, SubsurfaceInput0_Texture)
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SHADER_PARAMETER_SAMPLER(SamplerState, SubsurfaceSampler0)
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RENDER_TARGET_BINDING_SLOTS()
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END_SHADER_PARAMETER_STRUCT();
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static bool ShouldCompilePermutation(const FGlobalShaderPermutationParameters& Parameters)
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{
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return IsFeatureLevelSupported(Parameters.Platform, ERHIFeatureLevel::SM4);
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}
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};
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IMPLEMENT_GLOBAL_SHADER(FSubsurfaceViewportCopyPS, "/Engine/Private/PostProcessSubsurface.usf", "SubsurfaceViewportCopyPS", SF_Pixel);
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void ComputeSubsurfaceForView(
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FRDGBuilder& GraphBuilder,
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const FScreenPassViewInfo& ScreenPassView,
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const FScreenPassTextureViewport& SceneViewport,
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FRDGTextureRef SceneTexture,
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FRDGTextureRef SceneTextureOutput,
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ERenderTargetLoadAction SceneTextureLoadAction)
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{
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check(SceneTexture);
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check(SceneTextureOutput);
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check(SceneViewport.Extent == SceneTexture->Desc.Extent);
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const FViewInfo& View = ScreenPassView.View;
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const FSceneViewFamily* ViewFamily = View.Family;
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const FRDGTextureDesc& SceneTextureDesc = SceneTexture->Desc;
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const ESubsurfaceMode SubsurfaceMode = GetSubsurfaceModeForView(View);
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const bool bHalfRes = (SubsurfaceMode == ESubsurfaceMode::HalfRes);
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const bool bCheckerboard = IsSubsurfaceCheckerboardFormat(SceneTextureDesc.Format);
|
|
|
|
const uint32 ScaleFactor = bHalfRes ? 2 : 1;
|
|
|
|
/**
|
|
* All subsurface passes within the screen-space subsurface effect can operate at half or full resolution,
|
|
* depending on the subsurface mode. The values are precomputed and shared among all Subsurface textures.
|
|
*/
|
|
const FScreenPassTextureViewport SubsurfaceViewport = FScreenPassTextureViewport::CreateDownscaled(SceneViewport, ScaleFactor);
|
|
|
|
const FRDGTextureDesc SubsurfaceTextureDescriptor = FRDGTextureDesc::Create2DDesc(
|
|
SubsurfaceViewport.Extent,
|
|
PF_FloatRGBA,
|
|
FClearValueBinding(),
|
|
TexCreate_None,
|
|
TexCreate_RenderTargetable | TexCreate_ShaderResource,
|
|
false);
|
|
|
|
const FSubsurfaceParameters SubsurfaceCommonParameters = GetSubsurfaceCommonParameters(GraphBuilder.RHICmdList, View);
|
|
const FScreenPassTextureViewportParameters SubsurfaceViewportParameters = GetScreenPassTextureViewportParameters(SubsurfaceViewport);
|
|
const FScreenPassTextureViewportParameters SceneViewportParameters = GetScreenPassTextureViewportParameters(SceneViewport);
|
|
|
|
FRDGTextureRef SetupTexture = SceneTexture;
|
|
FRDGTextureRef SubsurfaceTextureX = nullptr;
|
|
FRDGTextureRef SubsurfaceTextureY = nullptr;
|
|
|
|
FRHISamplerState* PointClampSampler = TStaticSamplerState<SF_Point, AM_Clamp, AM_Clamp, AM_Clamp>::GetRHI();
|
|
FRHISamplerState* BilinearBorderSampler = TStaticSamplerState<SF_Bilinear, AM_Border, AM_Border, AM_Border>::GetRHI();
|
|
|
|
/**
|
|
* When in bypass mode, the setup and convolution passes are skipped, but lighting
|
|
* reconstruction is still performed in the recombine pass.
|
|
*/
|
|
if (SubsurfaceMode != ESubsurfaceMode::Bypass)
|
|
{
|
|
SetupTexture = GraphBuilder.CreateTexture(SubsurfaceTextureDescriptor, TEXT("SubsurfaceSetupTexture"));
|
|
|
|
// Setup pass outputs the diffuse scene color and depth in preparation for the scatter passes.
|
|
{
|
|
FSubsurfaceSetupPS::FParameters* PassParameters = GraphBuilder.AllocParameters<FSubsurfaceSetupPS::FParameters>();
|
|
PassParameters->Subsurface = SubsurfaceCommonParameters;
|
|
PassParameters->RenderTargets[0] = FRenderTargetBinding(SetupTexture, ERenderTargetLoadAction::ENoAction, ERenderTargetStoreAction::EStore);
|
|
PassParameters->SubsurfaceInput0 = GetSubsurfaceInput(SceneTexture, SceneViewportParameters);
|
|
PassParameters->SubsurfaceSampler0 = PointClampSampler;
|
|
|
|
FSubsurfaceSetupPS::FPermutationDomain PixelShaderPermutationVector;
|
|
PixelShaderPermutationVector.Set<FSubsurfaceSetupPS::FDimensionHalfRes>(bHalfRes);
|
|
PixelShaderPermutationVector.Set<FSubsurfaceSetupPS::FDimensionCheckerboard>(bCheckerboard);
|
|
TShaderMapRef<FSubsurfaceSetupPS> PixelShader(View.ShaderMap, PixelShaderPermutationVector);
|
|
|
|
/**
|
|
* The subsurface viewport is intentionally used as both the target and texture viewport, even though the texture
|
|
* is potentially double the size. This is to ensure that the source UVs map 1-to-1 with pixel centers of the target,
|
|
* in order to ensure that the checkerboard pattern selects the correct pixels from the scene texture. This still works
|
|
* because the texture viewport is normalized into UV space, so it doesn't matter that the dimensions are twice as large.
|
|
*/
|
|
AddDrawScreenPass(GraphBuilder, RDG_EVENT_NAME("SubsurfaceSetup"), ScreenPassView, SubsurfaceViewport, SubsurfaceViewport, *PixelShader, PassParameters);
|
|
}
|
|
|
|
SubsurfaceTextureX = GraphBuilder.CreateTexture(SubsurfaceTextureDescriptor, TEXT("SubsurfaceTextureX"));
|
|
SubsurfaceTextureY = GraphBuilder.CreateTexture(SubsurfaceTextureDescriptor, TEXT("SubsurfaceTextureY"));
|
|
|
|
FRHISamplerState* SubsurfaceSamplerState = FSubsurfacePS::GetSamplerState();
|
|
const FSubsurfacePS::EQuality SubsurfaceQuality = FSubsurfacePS::GetQuality();
|
|
|
|
struct FSubsurfacePassInfo
|
|
{
|
|
FSubsurfacePassInfo(const TCHAR* InName, FRDGTextureRef InInput, FRDGTextureRef InOutput)
|
|
: Name(InName)
|
|
, Input(InInput)
|
|
, Output(InOutput)
|
|
{}
|
|
|
|
const TCHAR* Name;
|
|
FRDGTextureRef Input;
|
|
FRDGTextureRef Output;
|
|
};
|
|
|
|
const FSubsurfacePassInfo SubsurfacePassInfoByDirection[] =
|
|
{
|
|
{ TEXT("SubsurfaceX"), SetupTexture, SubsurfaceTextureX },
|
|
{ TEXT("SubsurfaceY"), SubsurfaceTextureX, SubsurfaceTextureY },
|
|
};
|
|
|
|
// Horizontal / Vertical scattering passes using a separable filter.
|
|
for (uint32 DirectionIndex = 0; DirectionIndex < static_cast<uint32>(FSubsurfacePS::EDirection::MAX); ++DirectionIndex)
|
|
{
|
|
const auto Direction = static_cast<FSubsurfacePS::EDirection>(DirectionIndex);
|
|
|
|
const FSubsurfacePassInfo& PassInfo = SubsurfacePassInfoByDirection[DirectionIndex];
|
|
FRDGTextureRef TextureInput = PassInfo.Input;
|
|
FRDGTextureRef TextureOutput = PassInfo.Output;
|
|
|
|
FSubsurfacePS::FParameters* PassParameters = GraphBuilder.AllocParameters<FSubsurfacePS::FParameters>();
|
|
PassParameters->Subsurface = SubsurfaceCommonParameters;
|
|
PassParameters->RenderTargets[0] = FRenderTargetBinding(TextureOutput, ERenderTargetLoadAction::ENoAction, ERenderTargetStoreAction::EStore);
|
|
PassParameters->SubsurfaceInput0 = GetSubsurfaceInput(TextureInput, SubsurfaceViewportParameters);
|
|
PassParameters->SubsurfaceSampler0 = SubsurfaceSamplerState;
|
|
|
|
FSubsurfacePS::FPermutationDomain PixelShaderPermutationVector;
|
|
PixelShaderPermutationVector.Set<FSubsurfacePS::FDimensionDirection>(Direction);
|
|
PixelShaderPermutationVector.Set<FSubsurfacePS::FDimensionQuality>(SubsurfaceQuality);
|
|
TShaderMapRef<FSubsurfacePS> PixelShader(View.ShaderMap, PixelShaderPermutationVector);
|
|
|
|
AddDrawScreenPass(GraphBuilder, FRDGEventName(PassInfo.Name), ScreenPassView, SubsurfaceViewport, SubsurfaceViewport, *PixelShader, PassParameters);
|
|
}
|
|
}
|
|
|
|
// Recombines scattering result with scene color.
|
|
{
|
|
FSubsurfaceRecombinePS::FParameters* PassParameters = GraphBuilder.AllocParameters<FSubsurfaceRecombinePS::FParameters>();
|
|
PassParameters->Subsurface = SubsurfaceCommonParameters;
|
|
PassParameters->RenderTargets[0] = FRenderTargetBinding(SceneTextureOutput, SceneTextureLoadAction, ERenderTargetStoreAction::EStore);
|
|
PassParameters->SubsurfaceInput0 = GetSubsurfaceInput(SceneTexture, SceneViewportParameters);
|
|
PassParameters->SubsurfaceSampler0 = BilinearBorderSampler;
|
|
|
|
// Scattering output target is only used when scattering is enabled.
|
|
if (SubsurfaceMode != ESubsurfaceMode::Bypass)
|
|
{
|
|
PassParameters->SubsurfaceInput1 = GetSubsurfaceInput(SubsurfaceTextureY, SubsurfaceViewportParameters);
|
|
PassParameters->SubsurfaceSampler1 = BilinearBorderSampler;
|
|
}
|
|
|
|
const FSubsurfaceRecombinePS::EQuality RecombineQuality = FSubsurfaceRecombinePS::GetQuality(View);
|
|
|
|
FSubsurfaceRecombinePS::FPermutationDomain PixelShaderPermutationVector;
|
|
PixelShaderPermutationVector.Set<FSubsurfaceRecombinePS::FDimensionMode>(SubsurfaceMode);
|
|
PixelShaderPermutationVector.Set<FSubsurfaceRecombinePS::FDimensionQuality>(RecombineQuality);
|
|
PixelShaderPermutationVector.Set<FSubsurfaceRecombinePS::FDimensionCheckerboard>(bCheckerboard);
|
|
TShaderMapRef<FSubsurfaceRecombinePS> PixelShader(View.ShaderMap, PixelShaderPermutationVector);
|
|
|
|
/**
|
|
* See the related comment above in the prepare pass. The scene viewport is used as both the target and
|
|
* texture viewport in order to ensure that the correct pixel is sampled for checkerboard rendering.
|
|
*/
|
|
AddDrawScreenPass(GraphBuilder, RDG_EVENT_NAME("SubsurfaceRecombine"), ScreenPassView, SceneViewport, SceneViewport, *PixelShader, PassParameters);
|
|
}
|
|
}
|
|
|
|
FRDGTextureRef ComputeSubsurface(
|
|
FRDGBuilder& GraphBuilder,
|
|
FRDGTextureRef SceneTexture,
|
|
const TArray<FViewInfo>& Views)
|
|
{
|
|
const uint32 ViewCount = Views.Num();
|
|
const uint32 ViewMaskAll = (1 << ViewCount) - 1;
|
|
const uint32 ViewMask = GetSubsurfaceRequiredViewMask(Views);
|
|
|
|
// Return the original target if no views have subsurface applied.
|
|
if (!ViewMask)
|
|
{
|
|
return SceneTexture;
|
|
}
|
|
|
|
FRDGTextureRef SceneTextureOutput = GraphBuilder.CreateTexture(SceneTexture->Desc, TEXT("SceneColorSubsurface"));
|
|
|
|
ERenderTargetLoadAction SceneTextureLoadAction = ERenderTargetLoadAction::ENoAction;
|
|
|
|
const bool bHasNonSubsurfaceView = ViewMask != ViewMaskAll;
|
|
|
|
/**
|
|
* Since we are outputting to a new texture and certain views may not utilize subsurface scattering,
|
|
* we need to copy all non-subsurface views onto the destination texture.
|
|
*/
|
|
if (bHasNonSubsurfaceView)
|
|
{
|
|
FSubsurfaceViewportCopyPS::FParameters* PassParameters = GraphBuilder.AllocParameters<FSubsurfaceViewportCopyPS::FParameters>();
|
|
PassParameters->RenderTargets[0] = FRenderTargetBinding(SceneTextureOutput, ERenderTargetLoadAction::ENoAction, ERenderTargetStoreAction::EStore);
|
|
PassParameters->SubsurfaceInput0_Texture = SceneTexture;
|
|
PassParameters->SubsurfaceSampler0 = TStaticSamplerState<SF_Point, AM_Clamp, AM_Clamp, AM_Clamp>::GetRHI();
|
|
|
|
TShaderMapRef<FSubsurfaceViewportCopyPS> PixelShader(Views[0].ShaderMap);
|
|
|
|
const FIntPoint InputTextureSize = SceneTexture->Desc.Extent;
|
|
|
|
GraphBuilder.AddPass(
|
|
RDG_EVENT_NAME("SubsurfaceViewportCopy"),
|
|
PassParameters,
|
|
ERenderGraphPassFlags::None,
|
|
[&Views, ViewMask, ViewCount, PixelShader, InputTextureSize, PassParameters](FRHICommandListImmediate& RHICmdList)
|
|
{
|
|
for (uint32 ViewIndex = 0; ViewIndex < ViewCount; ++ViewIndex)
|
|
{
|
|
const uint32 ViewBit = 1 << ViewIndex;
|
|
|
|
const bool bIsNonSubsurfaceView = (ViewMask & ViewBit) == 0;
|
|
|
|
if (bIsNonSubsurfaceView)
|
|
{
|
|
const FViewInfo& View = Views[ViewIndex];
|
|
const FScreenPassViewInfo ScreenPassView(View);
|
|
|
|
DrawScreenPass(RHICmdList, ScreenPassView, View.ViewRect, View.ViewRect, InputTextureSize, *PixelShader, *PassParameters);
|
|
}
|
|
}
|
|
});
|
|
|
|
// Subsequent render passes should load the texture contents.
|
|
SceneTextureLoadAction = ERenderTargetLoadAction::ELoad;
|
|
}
|
|
|
|
for (uint32 ViewIndex = 0; ViewIndex < ViewCount; ++ViewIndex)
|
|
{
|
|
const uint32 ViewBit = 1 << ViewIndex;
|
|
|
|
const bool bIsSubsurfaceView = (ViewMask & ViewBit) != 0;
|
|
|
|
if (bIsSubsurfaceView)
|
|
{
|
|
RDG_EVENT_SCOPE(GraphBuilder, "SubsurfaceScattering(ViewId=%d)", ViewIndex);
|
|
|
|
const FViewInfo& View = Views[ViewIndex];
|
|
const FScreenPassViewInfo ScreenPassView(View);
|
|
const FScreenPassTextureViewport SceneViewport(View.ViewRect, SceneTexture);
|
|
|
|
ComputeSubsurfaceForView(GraphBuilder, ScreenPassView, SceneViewport, SceneTexture, SceneTextureOutput, SceneTextureLoadAction);
|
|
|
|
// Subsequent render passes should load the texture contents.
|
|
SceneTextureLoadAction = ERenderTargetLoadAction::ELoad;
|
|
}
|
|
}
|
|
|
|
return SceneTextureOutput;
|
|
}
|
|
|
|
void VisualizeSubsurface(
|
|
FRDGBuilder& GraphBuilder,
|
|
const FScreenPassViewInfo& ScreenPassView,
|
|
const FScreenPassTextureViewport& SceneViewport,
|
|
FRDGTextureRef SceneTexture,
|
|
FRDGTextureRef SceneTextureOutput)
|
|
{
|
|
check(SceneTexture);
|
|
check(SceneTextureOutput);
|
|
check(SceneViewport.Extent == SceneTexture->Desc.Extent);
|
|
|
|
const FViewInfo& View = ScreenPassView.View;
|
|
|
|
FSubsurfaceVisualizePS::FParameters* PassParameters = GraphBuilder.AllocParameters<FSubsurfaceVisualizePS::FParameters>();
|
|
PassParameters->Subsurface = GetSubsurfaceCommonParameters(GraphBuilder.RHICmdList, View);
|
|
PassParameters->RenderTargets[0] = FRenderTargetBinding(SceneTextureOutput, ERenderTargetLoadAction::EClear, ERenderTargetStoreAction::EStore);
|
|
PassParameters->SubsurfaceInput0.Texture = SceneTexture;
|
|
PassParameters->SubsurfaceInput0.Viewport = GetScreenPassTextureViewportParameters(SceneViewport);
|
|
PassParameters->SubsurfaceSampler0 = TStaticSamplerState<SF_Point, AM_Clamp, AM_Clamp, AM_Clamp>::GetRHI();
|
|
PassParameters->MiniFontTexture = GetMiniFontTexture();
|
|
|
|
TShaderMapRef<FSubsurfaceVisualizePS> PixelShader(View.ShaderMap);
|
|
|
|
GraphBuilder.AddPass(
|
|
RDG_EVENT_NAME("SubsurfaceVisualize"),
|
|
PassParameters,
|
|
ERenderGraphPassFlags::None,
|
|
[ScreenPassView, SceneViewport, SceneTextureOutput, PixelShader, PassParameters](FRHICommandListImmediate& RHICmdList)
|
|
{
|
|
DrawScreenPass(RHICmdList, ScreenPassView, SceneViewport, SceneViewport, *PixelShader, *PassParameters);
|
|
|
|
// Draw debug text
|
|
{
|
|
const FViewInfo& LocalView = ScreenPassView.View;
|
|
const FSceneViewFamily& ViewFamily = *LocalView.Family;
|
|
FRenderTargetTemp TempRenderTarget(static_cast<FRHITexture2D*>(SceneTextureOutput->GetRHI()), SceneTextureOutput->Desc.Extent);
|
|
FCanvas Canvas(&TempRenderTarget, nullptr, ViewFamily.CurrentRealTime, ViewFamily.CurrentWorldTime, ViewFamily.DeltaWorldTime, LocalView.GetFeatureLevel());
|
|
|
|
float X = 30;
|
|
float Y = 28;
|
|
const float YStep = 14;
|
|
|
|
FString Line = FString::Printf(TEXT("Visualize Screen Space Subsurface Scattering"));
|
|
Canvas.DrawShadowedString(X, Y += YStep, *Line, GetStatsFont(), FLinearColor(1, 1, 1));
|
|
|
|
Y += YStep;
|
|
|
|
uint32 Index = 0;
|
|
while (GSubsurfaceProfileTextureObject.GetEntryString(Index++, Line))
|
|
{
|
|
Canvas.DrawShadowedString(X, Y += YStep, *Line, GetStatsFont(), FLinearColor(1, 1, 1));
|
|
}
|
|
|
|
const bool bFlush = false;
|
|
const bool bInsideRenderPass = true;
|
|
Canvas.Flush_RenderThread(RHICmdList, bFlush, bInsideRenderPass);
|
|
}
|
|
});
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
//! Shim methods to hook into the legacy pipeline until the full RDG conversion is complete.
|
|
|
|
void ComputeSubsurfaceShim(FRHICommandListImmediate& RHICmdList, const TArray<FViewInfo>& Views)
|
|
{
|
|
FSceneRenderTargets& SceneRenderTargets = FSceneRenderTargets::Get(RHICmdList);
|
|
|
|
FRDGBuilder GraphBuilder(RHICmdList);
|
|
|
|
FRDGTextureRef SceneTexture = GraphBuilder.RegisterExternalTexture(SceneRenderTargets.GetSceneColor(), TEXT("SceneColor"));
|
|
|
|
FRDGTextureRef SceneTextureOutput = ComputeSubsurface(GraphBuilder, SceneTexture, Views);
|
|
|
|
// Extract the result texture out and re-assign it to the scene render targets blackboard.
|
|
TRefCountPtr<IPooledRenderTarget> SceneTarget;
|
|
GraphBuilder.QueueTextureExtraction(SceneTextureOutput, &SceneTarget, false);
|
|
GraphBuilder.Execute();
|
|
|
|
SceneRenderTargets.SetSceneColor(SceneTarget);
|
|
|
|
// 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).
|
|
SceneRenderTargets.SetLightAttenuation(nullptr);
|
|
}
|
|
|
|
FRenderingCompositeOutputRef VisualizeSubsurfaceShim(
|
|
FRHICommandListImmediate& InRHICmdList,
|
|
FRenderingCompositionGraph& Graph,
|
|
FRenderingCompositeOutputRef Input)
|
|
{
|
|
// we need the GBuffer, we release it Process()
|
|
FSceneRenderTargets::Get(InRHICmdList).AdjustGBufferRefCount(InRHICmdList, 1);
|
|
|
|
FRenderingCompositePass* SubsurfaceVisualizePass = Graph.RegisterPass(new(FMemStack::Get()) TRCPassForRDG<1, 1>(
|
|
[](FRenderingCompositePass* Pass, FRenderingCompositePassContext& CompositePassContext)
|
|
{
|
|
FRDGBuilder GraphBuilder(CompositePassContext.RHICmdList);
|
|
|
|
FRDGTextureRef SceneTexture = Pass->CreateRDGTextureForRequiredInput(GraphBuilder, ePId_Input0, TEXT("SceneColor"));
|
|
FRDGTextureRef SceneTextureOutput = Pass->FindOrCreateRDGTextureForOutput(GraphBuilder, ePId_Output0, SceneTexture->Desc, TEXT("SubsurfaceVisualize"));
|
|
|
|
const FScreenPassViewInfo ScreenPassView(CompositePassContext.View);
|
|
const FScreenPassTextureViewport SceneViewport(CompositePassContext.View.ViewRect, SceneTexture->Desc.Extent);
|
|
VisualizeSubsurface(GraphBuilder, ScreenPassView, SceneViewport, SceneTexture, SceneTextureOutput);
|
|
|
|
Pass->ExtractRDGTextureForOutput(GraphBuilder, ePId_Output0, SceneTextureOutput);
|
|
|
|
GraphBuilder.Execute();
|
|
|
|
FRHICommandListImmediate& RHICmdList = GraphBuilder.RHICmdList;
|
|
FSceneRenderTargets::Get(RHICmdList).AdjustGBufferRefCount(RHICmdList, -1);
|
|
}));
|
|
|
|
SubsurfaceVisualizePass->SetInput(ePId_Input0, Input);
|
|
return FRenderingCompositeOutputRef(SubsurfaceVisualizePass);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|