//
// Empty the loaders.
//
void ResetLoaders( UObject* InPkg )
{
// Make sure we're not in the middle of loading something in the background.
FlushAsyncLoading();
// Top level package to reset loaders for.
UObject* TopLevelPackage = InPkg ? InPkg->GetOutermost() : NULL;
// Find loader/ linker associated with toplevel package. We do this upfront as Detach resets LinkerRoot.
if( TopLevelPackage )
{
// Linker to reset/ detach.
ULinkerLoad* LinkerToReset = ULinkerLoad::FindExistingLinkerForPackage(CastChecked<UPackage>(TopLevelPackage));
if ( LinkerToReset )
{
for (TMap<UPackage*, ULinkerLoad*>::TIterator It(GObjLoaders); It; ++It)
{
ULinkerLoad* Linker = It.Value();
// Detach LinkerToReset from other linker's import table.
if( Linker->LinkerRoot != TopLevelPackage )
{
for( int32 j=0; j<Linker->ImportMap.Num(); j++ )
{
if( Linker->ImportMap[j].SourceLinker == LinkerToReset )
{
Linker->ImportMap[j].SourceLinker = NULL;
Linker->ImportMap[j].SourceIndex = INDEX_NONE;
}
}
}
else
{
check(Linker == LinkerToReset);
}
}
// Detach linker, also removes from array and sets LinkerRoot to NULL.
LinkerToReset->Detach(true);
}
}
else
{
TArray<ULinkerLoad *> LinkersToDetach;
GObjLoaders.GenerateValueArray(LinkersToDetach);
for (int32 Index = 0; Index < LinkersToDetach.Num(); Index++)
{
ULinkerLoad* Linker = LinkersToDetach[Index];
// Detach linker, also removes from array and sets LinkerRoot to NULL.
Linker->Detach(true);
}
}
}
UObject* FStreamableManager::SynchronousLoad(FStringAssetReference const& InTargetName)
{
UE_LOG(LogStreamableManager, Verbose, TEXT("Synchronous load %s"), *InTargetName.ToString());
if (FPackageName::IsShortPackageName(InTargetName.ToString()))
{
UE_LOG(LogStreamableManager, Error, TEXT(" Can't load invalid package name %s"), *InTargetName.ToString());
return NULL;
}
FStringAssetReference TargetName = ResolveRedirects(InTargetName);
FStreamable* Existing = StreamableItems.FindRef(TargetName);
while (Existing && Existing->bAsyncLoadRequestOutstanding)
{
UE_LOG(LogStreamableManager, Verbose, TEXT(" Flushing async load for %s"), *TargetName.ToString());
check(!Existing->bAsyncUnloadRequestOutstanding); // we should not be both loading and unloading
FlushAsyncLoading();
// the async request might have found a redirect and retried
TargetName = ResolveRedirects(TargetName);
Existing = StreamableItems.FindRef(TargetName);
}
if (!Existing)
{
Existing = StreamableItems.Add(TargetName, new FStreamable());
}
check(!Existing->bAsyncLoadRequestOutstanding); // should have already dealt with this
if (Existing->bAsyncUnloadRequestOutstanding)
{
check(!Existing->bAsyncLoadRequestOutstanding); // we should not be both loading and unloading
UE_LOG(LogStreamableManager, Verbose, TEXT(" Aborted unload for %s"), *TargetName.ToString());
Existing->bAsyncUnloadRequestOutstanding = false;
}
check(!Existing->bAsyncUnloadRequestOutstanding); // should have already dealt with this
check(!Existing->WeakTarget.Get()); // weak target is only valid during GC
if (!Existing->Target)
{
UE_LOG(LogStreamableManager, Verbose, TEXT(" Static loading %s"), *TargetName.ToString());
Existing->Target = StaticLoadObject(UObject::StaticClass(), NULL, *TargetName.ToString());
// need to manually detect redirectors because the above call only expects to load a UObject::StaticClass() type
while (UObjectRedirector* Redirector = Cast<UObjectRedirector>(Existing->Target))
{
Existing->Target = Redirector->DestinationObject;
}
if (Existing->Target)
{
UE_LOG(LogStreamableManager, Verbose, TEXT(" Static loaded %s"), *Existing->Target->GetFullName());
FStringAssetReference PossiblyNewName(Existing->Target->GetPathName());
if (PossiblyNewName != TargetName)
{
UE_LOG(LogStreamableManager, Verbose, TEXT(" Which redirected to %s"), *PossiblyNewName.ToString());
StreamableRedirects.Add(TargetName, PossiblyNewName);
StreamableItems.Add(PossiblyNewName, Existing);
StreamableItems.Remove(TargetName);
TargetName = PossiblyNewName; // we are done with the old name
}
}
else
{
Existing->bLoadFailed = true;
UE_LOG(LogStreamableManager, Log, TEXT("Failed attempt to load %s"), *TargetName.ToString());
}
}
else
{
Existing->bLoadFailed = false;
}
return Existing->Target;
}
void ResetLoaders(UObject* InPkg)
{
// Make sure we're not in the middle of loading something in the background.
FlushAsyncLoading();
FLinkerManager::Get().ResetLoaders(InPkg);
}
bool ULevelStreaming::RequestLevel(UWorld* PersistentWorld, bool bAllowLevelLoadRequests, bool bBlockOnLoad)
{
// Quit early in case load request already issued
if (bHasLoadRequestPending)
{
return true;
}
// Previous attempts have failed, no reason to try again
if (bFailedToLoad)
{
return false;
}
QUICK_SCOPE_CYCLE_COUNTER(STAT_ULevelStreaming_RequestLevel);
FScopeCycleCounterUObject Context(PersistentWorld);
// Package name we want to load
FName DesiredPackageName = PersistentWorld->IsGameWorld() ? GetLODPackageName() : GetWorldAssetPackageFName();
FName DesiredPackageNameToLoad = PersistentWorld->IsGameWorld() ? GetLODPackageNameToLoad() : PackageNameToLoad;
// Check if currently loaded level is what we want right now
if (LoadedLevel != NULL &&
LoadedLevel->GetOutermost()->GetFName() == DesiredPackageName)
{
return true;
}
// Can not load new level now, there is still level pending unload
if (PendingUnloadLevel != NULL)
{
return false;
}
// Try to find the [to be] loaded package.
UPackage* LevelPackage = (UPackage*) StaticFindObjectFast(UPackage::StaticClass(), NULL, DesiredPackageName, 0, 0, RF_PendingKill);
// Package is already or still loaded.
if (LevelPackage)
{
// Find world object and use its PersistentLevel pointer.
UWorld* World = UWorld::FindWorldInPackage(LevelPackage);
// Check for a redirector. Follow it, if found.
if ( !World )
{
World = UWorld::FollowWorldRedirectorInPackage(LevelPackage);
if ( World )
{
LevelPackage = World->GetOutermost();
}
}
if (World != NULL)
{
#if !(UE_BUILD_SHIPPING || UE_BUILD_TEST)
if (World->PersistentLevel == NULL)
{
UE_LOG(LogLevelStreaming, Log, TEXT("World exists but PersistentLevel doesn't for %s, most likely caused by reference to world of unloaded level and GC setting reference to NULL while keeping world object"), *World->GetOutermost()->GetName());
// print out some debug information...
StaticExec(World, *FString::Printf(TEXT("OBJ REFS CLASS=WORLD NAME=%s shortest"), *World->GetPathName()));
TMap<UObject*,UProperty*> Route = FArchiveTraceRoute::FindShortestRootPath( World, true, GARBAGE_COLLECTION_KEEPFLAGS );
FString ErrorString = FArchiveTraceRoute::PrintRootPath( Route, World );
UE_LOG(LogLevelStreaming, Log, TEXT("%s"), *ErrorString);
// before asserting
checkf(World->PersistentLevel,TEXT("Most likely caused by reference to world of unloaded level and GC setting reference to NULL while keeping world object"));
return false;
}
#endif
if (World->PersistentLevel != LoadedLevel)
{
SetLoadedLevel(World->PersistentLevel);
// Broadcast level loaded event to blueprints
OnLevelLoaded.Broadcast(this);
}
return true;
}
}
EPackageFlags PackageFlags = PKG_None;
int32 PIEInstanceID = INDEX_NONE;
// copy streaming level on demand if we are in PIE
// (the world is already loaded for the editor, just find it and copy it)
if ( PersistentWorld->IsPlayInEditor() )
{
#if WITH_EDITOR
if (PersistentWorld->GetOutermost()->HasAnyPackageFlags(PKG_PlayInEditor))
{
PackageFlags |= PKG_PlayInEditor;
}
PIEInstanceID = PersistentWorld->GetOutermost()->PIEInstanceID;
#endif
const FString NonPrefixedLevelName = UWorld::StripPIEPrefixFromPackageName(DesiredPackageName.ToString(), PersistentWorld->StreamingLevelsPrefix);
UPackage* EditorLevelPackage = FindObjectFast<UPackage>(nullptr, FName(*NonPrefixedLevelName));
bool bShouldDuplicate = EditorLevelPackage && (bBlockOnLoad || EditorLevelPackage->IsDirty() || !GEngine->PreferToStreamLevelsInPIE());
if (bShouldDuplicate)
{
// Do the duplication
UWorld* PIELevelWorld = UWorld::DuplicateWorldForPIE(NonPrefixedLevelName, PersistentWorld);
if (PIELevelWorld)
{
PIELevelWorld->PersistentLevel->bAlreadyMovedActors = true; // As we have duplicated the world, the actors will already have been transformed
check(PendingUnloadLevel == NULL);
SetLoadedLevel(PIELevelWorld->PersistentLevel);
// Broadcast level loaded event to blueprints
{
QUICK_SCOPE_CYCLE_COUNTER(STAT_OnLevelLoaded_Broadcast);
OnLevelLoaded.Broadcast(this);
}
return true;
}
else if (PersistentWorld->WorldComposition == NULL) // In world composition streaming levels are not loaded by default
{
if ( bAllowLevelLoadRequests )
{
UE_LOG(LogLevelStreaming, Log, TEXT("World to duplicate for PIE '%s' not found. Attempting load."), *NonPrefixedLevelName);
}
else
{
UE_LOG(LogLevelStreaming, Warning, TEXT("Unable to duplicate PIE World: '%s'"), *NonPrefixedLevelName);
}
}
}
}
// Async load package if world object couldn't be found and we are allowed to request a load.
if (bAllowLevelLoadRequests)
{
FString PackageNameToLoadFrom = DesiredPackageName.ToString();
if (DesiredPackageNameToLoad != NAME_None)
{
PackageNameToLoadFrom = DesiredPackageNameToLoad.ToString();
}
if (GUseSeekFreeLoading)
{
// Only load localized package if it exists as async package loading doesn't handle errors gracefully.
FString LocalizedPackageName = PackageNameToLoadFrom + LOCALIZED_SEEKFREE_SUFFIX;
FString LocalizedFileName;
if (FPackageName::DoesPackageExist(LocalizedPackageName, NULL, &LocalizedFileName))
{
// Load localized part of level first in case it exists. We don't need to worry about GC or completion
// callback as we always kick off another async IO for the level below.
LoadPackageAsync(*(GetWorldAssetPackageName() + LOCALIZED_SEEKFREE_SUFFIX), nullptr, *LocalizedPackageName, FLoadPackageAsyncDelegate(), PackageFlags, PIEInstanceID);
}
}
if (FPackageName::DoesPackageExist(PackageNameToLoadFrom, NULL, NULL))
{
bHasLoadRequestPending = true;
ULevel::StreamedLevelsOwningWorld.Add(DesiredPackageName, PersistentWorld);
UWorld::WorldTypePreLoadMap.FindOrAdd(DesiredPackageName) = PersistentWorld->WorldType;
// Kick off async load request.
STAT_ADD_CUSTOMMESSAGE_NAME( STAT_NamedMarker, *(FString( TEXT( "RequestLevel - " ) + DesiredPackageName.ToString() )) );
LoadPackageAsync(DesiredPackageName.ToString(), nullptr, *PackageNameToLoadFrom, FLoadPackageAsyncDelegate::CreateUObject(this, &ULevelStreaming::AsyncLevelLoadComplete), PackageFlags, PIEInstanceID);
// streamingServer: server loads everything?
// Editor immediately blocks on load and we also block if background level streaming is disabled.
if (bBlockOnLoad || ShouldBeAlwaysLoaded())
{
// Finish all async loading.
FlushAsyncLoading();
}
}
else
{
UE_LOG(LogStreaming, Error,TEXT("Couldn't find file for package %s."), *PackageNameToLoadFrom);
bFailedToLoad = true;
return false;
}
}
return true;
}