GlobalDistanceField.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Math/IntVector.h"
 
class FDistanceFieldAOParameters;
class FGlobalDistanceFieldInfo;
class FRDGBuilder;
class FRDGExternalAccessQueue;
class FScene;
class FSceneViewFamily;
class FViewInfo;
 
struct FSceneRenderUpdateInputs;
 
enum FGlobalDFCacheType
{
    GDF_MostlyStatic,
    GDF_Full,
    GDF_Num
};
 
extern int32 GAOGlobalDistanceField;
 
bool UseGlobalDistanceField();
bool UseGlobalDistanceField(const FDistanceFieldAOParameters& Parameters);
 
namespace GlobalDistanceField
{
    int32 GetClipmapResolution(bool bLumenEnabled);
    int32 GetMipFactor();
    int32 GetClipmapMipResolution(bool bLumenEnabled);
    float GetClipmapExtent(int32 ClipmapIndex, const FScene* Scene, bool bLumenEnabled);
    int32 GetNumGlobalDistanceFieldClipmaps(bool bLumenEnabled, float LumenSceneViewDistance);
 
    FIntVector GetPageAtlasSizeInPages(bool bLumenEnabled, float LumenSceneViewDistance);
    FIntVector GetPageAtlasSize(bool bLumenEnabled, float LumenSceneViewDistance);
    FIntVector GetCoverageAtlasSize(bool bLumenEnabled, float LumenSceneViewDistance);
    uint32 GetPageTableClipmapResolution(bool bLumenEnabled);
    FIntVector GetPageTableTextureResolution(bool bLumenEnabled, float LumenSceneViewDistance);
    int32 GetMaxPageNum(bool bLumenEnabled, float LumenSceneViewDistance);
};
 
extern void UpdateGlobalDistanceFieldVolume(
    FRDGBuilder& GraphBuilder,
    FRDGExternalAccessQueue& ExternalAccessQueue,
    FViewInfo& View, 
    FScene* Scene, 
    float MaxOcclusionDistance, 
    bool bLumenEnabled,
    FGlobalDistanceFieldInfo& Info);