DepthCopy.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    DepthCopy.h: Depth copy utilities.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderGraphUtils.h"
#include "GlobalShader.h"
 
class FViewInfo;
 
namespace DepthCopy
{
 
// This is a temporary workaround while we get AddCopyTexturePass to do a proper copy of depth texture (with source texture HTile maintained).
// On some platforms this is not the case: depth is decompressed so that the depth format can be read through SRV and HTile optimizations are thus lost on the source texture.
// While we wait for such support, we do a simple copy from SRV to UAV.
void AddViewDepthCopyCSPass(FRDGBuilder& GraphBuilder, FViewInfo& View, FRDGTextureRef SourceSceneDepthTexture, FRDGTextureRef DestinationDepthTexture);
 
class FCopyDepthPS : public FGlobalShader
{
public:
    DECLARE_GLOBAL_SHADER(FCopyDepthPS);
    SHADER_USE_PARAMETER_STRUCT(FCopyDepthPS, FGlobalShader);
 
    class FMSAASampleCount : SHADER_PERMUTATION_SPARSE_INT("MSAA_SAMPLE_COUNT", 1, 2, 4, 8);
    using FPermutationDomain = TShaderPermutationDomain<FMSAASampleCount>;
 
    BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
        SHADER_PARAMETER_RDG_TEXTURE(Texture2D, DepthTexture)
        SHADER_PARAMETER_RDG_TEXTURE(Texture2DMS, DepthTextureMS)
        RENDER_TARGET_BINDING_SLOTS()
        END_SHADER_PARAMETER_STRUCT()
 
        static bool ShouldCompilePermutation(const FGlobalShaderPermutationParameters& Parameters)
    {
        return IsFeatureLevelSupported(Parameters.Platform, ERHIFeatureLevel::SM5) || MobileSupportsSM5MaterialNodes(Parameters.Platform);
    }
};
 
// This is a temporary workaround while we get AddCopyTexturePass to do a proper copy of depth texture (with source texture HTile maintained).
// This one does a depth buffer copy via pixel shader depth output. This is valid on some platform having moore complex HTile management.
void AddViewDepthCopyPSPass(FRDGBuilder& GraphBuilder, FViewInfo& View, FRDGTextureRef SourceSceneDepthTexture, FRDGTextureRef DestinationDepthTexture);
 
};