HLODEngineSubsystem.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Subsystems/EngineSubsystem.h"
#include "Engine/World.h"
#include "HLODEngineSubsystem.generated.h"
 
UCLASS(MinimalAPI)
class UHLODEngineSubsystem : public UEngineSubsystem
{
    GENERATED_BODY()
 
#if WITH_EDITOR
 
public:
    //~ Begin USubsystem Interface.
    ENGINE_API virtual void Initialize(FSubsystemCollectionBase& Collection) override;
    ENGINE_API virtual void Deinitialize() override;
    //~ End USubsystem Interface.
 
    ENGINE_API bool CleanupHLODs(UWorld* InWorld);
 
    ENGINE_API bool CleanupHLODs(ULevel* InLevel);
    
    ENGINE_API void DisableHLODCleanupOnLoad(bool bInDisableHLODCleanup);
 
    ENGINE_API void DisableHLODSpawningOnLoad(bool bInDisableHLODSpawning);
 
    // Should be called when the "Save LOD Actors to HLOD Packages" option is toggled.
    ENGINE_API void OnSaveLODActorsToHLODPackagesChanged();
 
private:
    // Recreate LOD actors for all levels in the provided world.
    void RecreateLODActorsForWorld(UWorld* InWorld, const UWorld::InitializationValues InInitializationValues);
    
    // Recreate LOD actors for the given level.
    void RecreateLODActorsForLevel(ULevel* InLevel, UWorld* InWorld);
 
    void OnPreSaveWorld(UWorld* InWorld, FObjectPreSaveContext ObjectSaveContext);
 
    void UnregisterRecreateLODActorsDelegates();
    void RegisterRecreateLODActorsDelegates();
 
    bool CleanupHLOD(class ALODActor* InLODActor);
 
private:
    FDelegateHandle OnPostWorldInitializationDelegateHandle;
    FDelegateHandle OnLevelAddedToWorldDelegateHandle;
    FDelegateHandle OnPreSaveWorlDelegateHandle;
 
    bool bDisableHLODCleanupOnLoad;
    bool bDisableHLODSpawningOnLoad;
 
#endif // WITH_EDITOR
};