StandaloneHLODSubsystem.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Subsystems/WorldSubsystem.h"
#include "WorldPartition/WorldPartitionActorDesc.h"
 
#include "StandaloneHLODSubsystem.generated.h"
 
class AWorldPartitionStandaloneHLOD;
class FLevelInstanceActorDesc;
class UActorDescContainerInstance;
 
UCLASS(MinimalAPI)
class UWorldPartitionStandaloneHLODSubsystem : public UWorldSubsystem
{
    GENERATED_BODY()
 
#if WITH_EDITOR
private:
    struct FStandaloneHLODActorParams
    {
        FGuid Guid;
        FTransform Transform;
        FString WorldPackageName;
        FString ActorLabel;
    };
 
public:
 
    //~ Begin USubsystem Interface.
    ENGINE_API virtual void Initialize(FSubsystemCollectionBase& Collection) override;
    ENGINE_API virtual void Deinitialize() override;
    //~ End USubsystem Interface.
 
    //~ Begin UWorldSubsystem Interface.
    ENGINE_API virtual bool DoesSupportWorldType(const EWorldType::Type WorldType) const override;
    ENGINE_API virtual bool ShouldCreateSubsystem(UObject* Outer) const override;
    //~ End UWorldSubsystem Interface.
 
    ENGINE_API void UpdateStandaloneHLODActors(FStandaloneHLODActorParams InStandaloneHLODActorParams);
    ENGINE_API void DeleteStandaloneHLODActors(FGuid InGuid);
 
    ENGINE_API void UpdateStandaloneHLODActorsRecursive(const FLevelInstanceActorDesc& InLevelInstanceActorDesc, const FTransform InActorTransform, bool bChildrenOnly);
    ENGINE_API void DeleteStandaloneHLODActorsRecursive(const FLevelInstanceActorDesc& InLevelInstanceActorDesc);
 
    ENGINE_API void ForEachStandaloneHLODActor(TFunctionRef<void(AWorldPartitionStandaloneHLOD*)> Func) const;
    ENGINE_API void ForEachStandaloneHLODActorFiltered(FGuid InGuid, TFunctionRef<void(AWorldPartitionStandaloneHLOD*)> Func) const;
 
    static ENGINE_API bool GetStandaloneHLODFolderPathAndPackagePrefix(const FString& InWorldPackageName, FString& OutFolderPath, FString& OutPackagePrefix);
 
private:
    void OnWorldPartitionInitialized(UWorldPartition* InWorldPartition);
    void OnWorldPartitionUninitialized(UWorldPartition* InWorldPartition);
 
    void OnActorChanged(AActor* InActor);
    void OnActorDeleted(AActor* InActor);
    void OnObjectPropertyChanged(UObject* InObject, FPropertyChangedEvent& InPropertyChangedEvent);
 
    void OnActorDescContainerInstanceRegistered(UActorDescContainerInstance* InContainerInstance);
    void OnActorDescContainerInstanceUnregistered(UActorDescContainerInstance* InContainerInstance);
 
    void OnLevelAddedToWorld(ULevel* Level, UWorld* World);
 
    TMap<FGuid, TArray<AWorldPartitionStandaloneHLOD*>> StandaloneHLODActors;
 
    TMap<FName, TMap<int32, FName>> CachedHLODSetups;
    bool bRefreshCachedHLODSetups;
#endif
};