TranslucentRendering.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "HitProxies.h"
#include "ShaderParameters.h"
#include "GlobalShader.h"
#include "SceneRendering.h"
#include "VolumeRendering.h"
#include "ScreenPass.h"
#include "SystemTextures.h"
#include "RenderGraphDefinitions.h"
#include "PostProcess/SceneRenderTargets.h"
 
#define DISTORTION_STENCIL_MASK_BIT STENCIL_SANDBOX_MASK
 
struct FSeparateTranslucencyDimensions
{
    inline FScreenPassTextureViewport GetViewport(FIntRect ViewRect) const
    {
        return FScreenPassTextureViewport(Extent, GetScaledRect(ViewRect, Scale));
    }
 
    FScreenPassTextureViewport GetInstancedStereoViewport(const FViewInfo& View) const;
 
    // Extent of the separate translucency targets, if downsampled.
    FIntPoint Extent = FIntPoint::ZeroValue;
 
    // Amount the view rects should be scaled to match the new separate translucency extent.
    float Scale = 1.0f;
 
    // The number of MSAA samples to use when creating separate translucency textures.
    uint32 NumSamples = 1;
};
 
DECLARE_GPU_DRAWCALL_STAT_EXTERN(Translucency);
 
FRDGTextureRef AddCopySceneColorPass(FRDGBuilder& GraphBuilder, TArrayView<const FViewInfo> Views, FRDGTextureMSAA SceneColor, bool WithAlpha = false, bool bSkipIfUnderwater = true);
 
EMeshPass::Type TranslucencyPassToMeshPass(ETranslucencyPass::Type TranslucencyPass);
 
ETranslucencyView GetTranslucencyView(const FViewInfo& View);
 
ETranslucencyView GetTranslucencyViews(TArrayView<const FViewInfo> Views);
 
FSeparateTranslucencyDimensions UpdateSeparateTranslucencyDimensions(const FSceneRenderer& SceneRenderer);
 
bool IsSeparateTranslucencyEnabled(ETranslucencyPass::Type TranslucencyPass, float DownsampleScale);
 
const FRDGTextureDesc GetPostDOFTranslucentTextureDesc(ETranslucencyPass::Type TranslucencyPass, const FSeparateTranslucencyDimensions& SeparateTranslucencyDimensions, bool bIsModulate, EShaderPlatform ShaderPlatform);
 
FRDGTextureMSAA CreatePostDOFTranslucentTexture(FRDGBuilder& GraphBuilder, ETranslucencyPass::Type TranslucencyPass, const FSeparateTranslucencyDimensions& SeparateTranslucencyDimensions, bool bIsModulate, EShaderPlatform ShaderPlatform);
 
 
struct FTranslucencyComposition
{
    enum class EOperation
    {
        UpscaleOnly,
        ComposeToExistingSceneColor,
        ComposeToNewSceneColor,
        ComposeToSceneColorAlpha
    };
 
    EOperation Operation = EOperation::UpscaleOnly;
    bool bApplyModulateOnly = false;
 
    FScreenPassTextureSlice SceneColor;
    FScreenPassTexture SceneDepth;
 
    FScreenPassTextureViewport OutputViewport;
    EPixelFormat OutputPixelFormat = PF_Unknown;
 
    // [Optional] Lens distortion applied on the scene color.
    FLensDistortionLUT LensDistortionLUT;
 
    FScreenPassTexture AddPass(
        FRDGBuilder& GraphBuilder,
        const FViewInfo& View,
        const FTranslucencyPassResources& TranslucencyTextures) const;
};