PostProcessDeferredDecals.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "RenderGraph.h"
#include "SceneTextureParameters.h"
#include "SceneView.h"
#include "InstanceCulling/InstanceCullingContext.h"
#include "Substrate/Substrate.h"
 
enum class EDecalRenderStage : uint8;
enum class EDecalRenderTargetMode : uint8;
struct FVisibleDecal;
struct FDBufferTextures;
struct FSceneTextures;
class FViewInfo;
 
DECLARE_UNIFORM_BUFFER_STRUCT(FSceneUniformParameters, RENDERER_API)
 
bool AreDecalsEnabled(const FSceneViewFamily& ViewFamily);
bool IsDBufferEnabled(const FSceneViewFamily& ViewFamily, EShaderPlatform ShaderPlatform);
 
BEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FDecalPassUniformParameters, )
    SHADER_PARAMETER_STRUCT(FSceneTextureUniformParameters, SceneTextures)
    SHADER_PARAMETER_STRUCT(FMobileSceneTextureUniformParameters, MobileSceneTextures)
    SHADER_PARAMETER_STRUCT(FSubstratePublicParameters, SubstratePublic)
    SHADER_PARAMETER_RDG_BUFFER_SRV(StructuredBuffer<float4>, EyeAdaptationBuffer)
END_GLOBAL_SHADER_PARAMETER_STRUCT()
 
struct FDeferredDecalPassTextures
{
    TRDGUniformBufferRef<FDecalPassUniformParameters> DecalPassUniformBuffer = nullptr;
 
    // Potential render targets for the decal pass.
    FRDGTextureMSAA Depth;
    FRDGTextureRef Color = nullptr;
    FRDGTextureRef ScreenSpaceAO = nullptr;
    FRDGTextureRef GBufferA = nullptr;
    FRDGTextureRef GBufferB = nullptr;
    FRDGTextureRef GBufferC = nullptr;
    FRDGTextureRef GBufferE = nullptr;
    FDBufferTextures* DBufferTextures = nullptr;
};
 
FDeferredDecalPassTextures GetDeferredDecalPassTextures(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FSubstrateSceneData& SubstrateSceneData,
    const FSceneTextures& SceneTextures,
    FDBufferTextures* DBufferTextures,
    EDecalRenderStage DecalRenderStage);
 
void AddDeferredDecalPass(
    FRDGBuilder& GraphBuilder,
    FViewInfo& ViewInfo,
    TConstArrayView<const FVisibleDecal*> SortedDecals,
    const FDeferredDecalPassTextures& Textures,
    FInstanceCullingManager& InstanceCullingManager,
    EDecalRenderStage RenderStage);
 
BEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FDeferredDecalUniformParameters, )
    SHADER_PARAMETER_TEXTURE(Texture2D, PreviousFrameNormal)
    SHADER_PARAMETER(int32, NormalReprojectionEnabled)
    SHADER_PARAMETER(float, NormalReprojectionThresholdLow)
    SHADER_PARAMETER(float, NormalReprojectionThresholdHigh)
    SHADER_PARAMETER(float, NormalReprojectionThresholdScaleHelper)
    SHADER_PARAMETER(FVector2f, NormalReprojectionJitter)
END_SHADER_PARAMETER_STRUCT()
 
TUniformBufferRef<FDeferredDecalUniformParameters> CreateDeferredDecalUniformBuffer(const FViewInfo& View);
 
BEGIN_SHADER_PARAMETER_STRUCT(FDeferredDecalPassParameters, )
    SHADER_PARAMETER_STRUCT_INCLUDE(FViewShaderParameters, View)
    SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSceneUniformParameters, Scene)
    SHADER_PARAMETER_STRUCT_REF(FDeferredDecalUniformParameters, DeferredDecal)
    SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FDecalPassUniformParameters, DecalPass)
    SHADER_PARAMETER_STRUCT_INCLUDE(FInstanceCullingDrawParams, InstanceCullingDrawParams)
    RENDER_TARGET_BINDING_SLOTS()
END_SHADER_PARAMETER_STRUCT()
 
void GetDeferredDecalRenderTargetsInfo(
    const FSceneTexturesConfig& Config,
    EDecalRenderTargetMode RenderTargetMode,
    FGraphicsPipelineRenderTargetsInfo& RenderTargetsInfo);
 
void CollectDeferredDecalPassPSOInitializers(
    int32 PSOCollectorIndex,
    ERHIFeatureLevel::Type FeatureLevel,
    const FSceneTexturesConfig& SceneTexturesConfig,
    const FMaterial& Material,
    EDecalRenderStage DecalRenderStage,
    TArray<FPSOPrecacheData>& PSOInitializers);
 
void GetDeferredDecalPassParameters(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FDeferredDecalPassTextures& DecalPassTextures,
    EDecalRenderStage DecalRenderStage,
    EDecalRenderTargetMode RenderTargetMode,
    FDeferredDecalPassParameters& PassParameters);
 
void RenderMeshDecals(
    FRDGBuilder& GraphBuilder,
    const FScene& Scene,
    FViewInfo& View,
    const FDeferredDecalPassTextures& DecalPassTextures,
    FInstanceCullingManager& InstanceCullingManager, 
    EDecalRenderStage DecalRenderStage);
 
bool HasAnyDrawCommandDecalCount(
    EDecalRenderStage DecalRenderStage, 
    FViewInfo& View);
 
void ExtractNormalsForNextFrameReprojection(
    FRDGBuilder& GraphBuilder,
    const FSceneTextures& SceneTextures,
    const TArray<FViewInfo>& Views);