CompositionLighting.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    CompositionLighting.h: The center for all deferred lighting activities.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "SceneRendering.h"
#include "CompositionLighting/PostProcessDeferredDecals.h"
#include "CompositionLighting/PostProcessAmbientOcclusion.h"
#include "DecalRenderingShared.h"
 
class FCompositionLighting
{
public:
    FCompositionLighting(FDecalVisibilityTaskData* InDecalVisibility, TArrayView<FViewInfo> InViews, const FSceneTextures& InSceneTextures, TUniqueFunction<bool(int32)> RequestSSAOFunction);
    ~FCompositionLighting();
 
    void ProcessAfterOcclusion(FRDGBuilder& GraphBuilder);
 
    void ProcessBeforeBasePass(FRDGBuilder& GraphBuilder, FDBufferTextures& DBufferTextures, FInstanceCullingManager& InstanceCullingManager, const FSubstrateSceneData& SubstrateSceneData);
 
    enum class EProcessAfterBasePassMode
    {
        OnlyBeforeLightingDecals,
        SkipBeforeLightingDecals,
        All
    };
 
    void ProcessAfterBasePass(FRDGBuilder& GraphBuilder, FInstanceCullingManager& InstanceCullingManager, EProcessAfterBasePassMode Mode, const FSubstrateSceneData& SubstrateSceneData);
 
private:
    void TryInit();
 
    const TArrayView<FViewInfo> Views;
    const FSceneViewFamily& ViewFamily;
    const FSceneTextures& SceneTextures;
 
    enum class ESSAOLocation
    {
        None,
        BeforeBasePass,
        AfterBasePass
    };
 
    struct FAOConfig
    {
        uint32 Levels = 0;
        EGTAOType GTAOType = EGTAOType::EOff;
        ESSAOLocation SSAOLocation = ESSAOLocation::None;
        bool bSSAOAsync = false;
        bool bRequested = false;
    };
 
    FDecalVisibilityTaskData* DecalVisibility = nullptr;
    TArray<FAOConfig, TInlineAllocator<8>> ViewAOConfigs;
    FRDGTextureRef HorizonsTexture = nullptr;
    bool bInitialized = false;
};
 
extern bool ShouldRenderScreenSpaceAmbientOcclusion(const FViewInfo& View, bool bLumenWantsSSAO);