VolumetricLightmapGrid.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Guid.h"
#include "Serialization/BulkData.h"
#include "VolumetricLightmapGrid.generated.h"
 
 
class FPrecomputedVolumetricLightmapData;
class UMapBuildDataRegistry;
 
USTRUCT()
struct FVolumetricLightMapGridCell
{
    GENERATED_USTRUCT_BODY()
    
    UPROPERTY()
    FBox Bounds;
 
    FByteBulkData BulkData;
 
#if WITH_EDITOR
    // ptr to the just recently built version of the FPrecomputedVolumetricLightmapData
    // not used at runtime
    FPrecomputedVolumetricLightmapData* EditorData = nullptr;
#endif
    
    UPROPERTY()
    uint32 CellID = -1;
};  
 
USTRUCT()
struct FVolumetricLightMapGridDesc
{
    GENERATED_USTRUCT_BODY()
 
    UPROPERTY()
    FBox GridBounds;
    
    UPROPERTY()
    FGuid Guid; 
 
    UPROPERTY()
    float CellSize = 0.0f;
 
    UPROPERTY()
    float DetailCellSize = 0.0f;
 
    UPROPERTY()
    float BrickSize = 0.0f;
 
    UPROPERTY()
    TArray<FVolumetricLightMapGridCell>     Cells;
    
    bool IsValid() const { return Guid.IsValid(); }
 
    ENGINE_API FGuid    GetCellGuid(uint32 CellID) const;
    ENGINE_API FString  GetCellDesc(FGuid LevelId) const;
 
    ENGINE_API FVolumetricLightMapGridCell* GetCell(FGuid LevelId) const;   
    ENGINE_API FVolumetricLightMapGridCell* GetCell(const FVector& InPosition) const; 
    
    [[nodiscard]] ENGINE_API TArray<FVolumetricLightMapGridCell*> GetIntersectingCells(const FBox& InBounds, bool bInWithData); 
    
    ENGINE_API void LoadVolumetricLightMapCell(FVolumetricLightMapGridCell& Cell, FPrecomputedVolumetricLightmapData*& OutData);
 
    ENGINE_API FPrecomputedVolumetricLightmapData* GetPrecomputedVolumetricLightmapBuildData(FGuid LevelId) const;
    ENGINE_API FPrecomputedVolumetricLightmapData* GetOrCreatePrecomputedVolumetricLightmapBuildData(FGuid LevelId);
 
#if WITH_EDITOR
    ENGINE_API void InitializeBulkData();
    ENGINE_API void Initialize(UWorld* InWorld, const FBox& InBounds);
#endif
 
    void SerializeBulkData(FArchive& Ar, UObject* Owner);
};