bool UGameInstance::InitializePIE(bool bAnyBlueprintErrors, int32 PIEInstance)
{
UEditorEngine* const EditorEngine = CastChecked<UEditorEngine>(GetEngine());
// Look for an existing pie world context, may have been created before
WorldContext = EditorEngine->GetWorldContextFromPIEInstance(PIEInstance);
if (!WorldContext)
{
// If not, create a new one
WorldContext = &EditorEngine->CreateNewWorldContext(EWorldType::PIE);
WorldContext->PIEInstance = PIEInstance;
}
WorldContext->OwningGameInstance = this;
const FString WorldPackageName = EditorEngine->EditorWorld->GetOutermost()->GetName();
// Establish World Context for PIE World
WorldContext->LastURL.Map = WorldPackageName;
WorldContext->PIEPrefix = WorldContext->PIEInstance != INDEX_NONE ? UWorld::BuildPIEPackagePrefix(WorldContext->PIEInstance) : FString();
const ULevelEditorPlaySettings* PlayInSettings = GetDefault<ULevelEditorPlaySettings>();
// We always need to create a new PIE world unless we're using the editor world for SIE
UWorld* NewWorld = nullptr;
const EPlayNetMode PlayNetMode = [&PlayInSettings]{ EPlayNetMode NetMode(PIE_Standalone); return (PlayInSettings->GetPlayNetMode(NetMode) ? NetMode : PIE_Standalone); }();
const bool CanRunUnderOneProcess = [&PlayInSettings]{ bool RunUnderOneProcess(false); return (PlayInSettings->GetRunUnderOneProcess(RunUnderOneProcess) && RunUnderOneProcess); }();
if (PlayNetMode == PIE_Client)
{
// We are going to connect, so just load an empty world
NewWorld = EditorEngine->CreatePIEWorldFromEntry(*WorldContext, EditorEngine->EditorWorld, PIEMapName);
}
else if (PlayNetMode == PIE_ListenServer && !CanRunUnderOneProcess)
{
// We *have* to save the world to disk in order to be a listen server that allows other processes to connect.
// Otherwise, clients would not be able to load the world we are using
NewWorld = EditorEngine->CreatePIEWorldBySavingToTemp(*WorldContext, EditorEngine->EditorWorld, PIEMapName);
}
else
{
// Standard PIE path: just duplicate the EditorWorld
NewWorld = EditorEngine->CreatePIEWorldByDuplication(*WorldContext, EditorEngine->EditorWorld, PIEMapName);
}
// failed to create the world!
if (NewWorld == nullptr)
{
FMessageDialog::Open(EAppMsgType::Ok, NSLOCTEXT("UnrealEd", "Error_FailedCreateEditorPreviewWorld", "Failed to create editor preview world."));
return false;
}
NewWorld->SetGameInstance(this);
WorldContext->SetCurrentWorld(NewWorld);
WorldContext->AddRef(EditorEngine->PlayWorld); // Tie this context to this UEngine::PlayWorld* // @fixme, needed still?
// make sure we can clean up this world!
NewWorld->ClearFlags(RF_Standalone);
NewWorld->bKismetScriptError = bAnyBlueprintErrors;
Init();
return true;
}
