PrecomputedVolumetricLightmapStreaming.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Guid.h"
 
class FSceneInterface;
class UWorld;
class IBulkDataIORequest;
class FPrecomputedVolumetricLightmap;
 
struct FVolumetricLightMapGridDesc;
struct FVolumetricLightMapGridCell;
class FVolumetricLightmapGridStreamingManager;
class UMapBuildDataRegistry;
class FPrecomputedVolumetricLightmapData;
 
class FVolumetricLightmapGridManager
{   
public:
 
    FVolumetricLightmapGridManager(UWorld* InWorld, FVolumetricLightMapGridDesc* Grid);
    ~FVolumetricLightmapGridManager();
 
    void UpdateBounds(const FBox& Bounds);
    int32 ProcessRequests();
    void RemoveFromScene(class FSceneInterface* InScene);
    int32 WaitForPendingRequest(float Timelimit);
    int32 GetNumPendingRequests();
 
private:
    
    friend class FVolumetricLightmapGridStreamingManager;
 
    UWorld* World = nullptr;
    UMapBuildDataRegistry* Registry = nullptr;
    FVolumetricLightMapGridDesc* Grid = nullptr;
    
    struct FCellRequest
    {
        enum EStatus
        {
            Created,
            Requested,
            Ready,
            Cancelled,
            Done
        };
 
        EStatus Status = Created;
        IBulkDataIORequest* IORequest = nullptr;
        TNotNull<FVolumetricLightMapGridCell*> Cell;
        FPrecomputedVolumetricLightmapData* Data = nullptr;
    };  
 
    struct FLoadedCellData
    {
        FPrecomputedVolumetricLightmapData* Data = nullptr;
        TNotNull<FVolumetricLightMapGridCell*> Cell;
        FPrecomputedVolumetricLightmap* Lightmap = nullptr;
    };
 
    void RequestVolumetricLightMapCell(FCellRequest& CellRequest);
    void ReleaseCellData(FLoadedCellData* LoadedCell, FSceneInterface* InScene);
    
    TArray<FCellRequest>    PendingCellRequests;
    TMap<FVolumetricLightMapGridCell*, FLoadedCellData> LoadedCells;
    
    FBox Bounds;
 
    FCriticalSection PendingRequestsCriticalSection;
 
    TUniquePtr<FVolumetricLightmapGridStreamingManager> StreamingManager;
};