DBufferTextures.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "RenderGraphDefinitions.h"
#include "RHIDefinitions.h"
#include "ShaderParameterMacros.h"
 
struct FSceneTextures;
class FSceneViewFamily;
class FSceneTextureUniformParameters;
class FViewInfo;
 
enum class EDecalDBufferMaskTechnique
{
    Disabled,   // DBufferMask is not enabled.
    PerPixel,   // DBufferMask is written explicitly by the shader during the DBuffer pass.
    WriteMask,  // DBufferMask is constructed after the DBuffer pass by compositing DBuffer write mask planes together in a compute shader.
};
 
EDecalDBufferMaskTechnique GetDBufferMaskTechnique(EShaderPlatform ShaderPlatform);
 
struct FDBufferTexturesDesc
{
    FRDGTextureDesc DBufferADesc;
    FRDGTextureDesc DBufferBDesc;
    FRDGTextureDesc DBufferCDesc;
    FRDGTextureDesc DBufferATexArrayDesc;
    FRDGTextureDesc DBufferBTexArrayDesc;
    FRDGTextureDesc DBufferCTexArrayDesc;
    FRDGTextureDesc DBufferMaskDesc;
};
 
struct FDBufferTextures
{
    bool IsValid() const;
 
    FRDGTextureRef DBufferA = nullptr;
    FRDGTextureRef DBufferB = nullptr;
    FRDGTextureRef DBufferC = nullptr;
    FRDGTextureRef DBufferATexArray = nullptr;
    FRDGTextureRef DBufferBTexArray = nullptr;
    FRDGTextureRef DBufferCTexArray = nullptr;
    FRDGTextureRef DBufferMask = nullptr;
};
 
FDBufferTexturesDesc GetDBufferTexturesDesc(FIntPoint Extent, EShaderPlatform ShaderPlatform);
FDBufferTextures CreateDBufferTextures(FRDGBuilder& GraphBuilder, FIntPoint Extent, EShaderPlatform ShaderPlatform, const bool bIsMobileMultiView = false);
 
BEGIN_SHADER_PARAMETER_STRUCT(FDBufferParameters, )
    SHADER_PARAMETER_RDG_TEXTURE(Texture2D, DBufferATexture)
    SHADER_PARAMETER_RDG_TEXTURE(Texture2D, DBufferBTexture)
    SHADER_PARAMETER_RDG_TEXTURE(Texture2D, DBufferCTexture)
    SHADER_PARAMETER_RDG_TEXTURE(Texture2DArray, DBufferATextureArray)
    SHADER_PARAMETER_RDG_TEXTURE(Texture2DArray, DBufferBTextureArray)
    SHADER_PARAMETER_RDG_TEXTURE(Texture2DArray, DBufferCTextureArray)
    SHADER_PARAMETER_RDG_TEXTURE(Texture2D<uint>, DBufferRenderMask)
    SHADER_PARAMETER_SAMPLER(SamplerState, DBufferATextureSampler)
    SHADER_PARAMETER_SAMPLER(SamplerState, DBufferBTextureSampler)
    SHADER_PARAMETER_SAMPLER(SamplerState, DBufferCTextureSampler)
END_SHADER_PARAMETER_STRUCT()
 
FDBufferParameters GetDBufferParameters(FRDGBuilder& GraphBuilder, const FDBufferTextures& DBufferTextures, EShaderPlatform ShaderPlatform, const bool bIsMobileMultiView = false);