Does `Deus Ex` work on `UTEngine`?

[GermanAizek]

Hello @dpjudas,
will it be possible to run game on Unreal Engine, example as Deus Ex and have 100% open source, or is there still a big difference between the UTengine and Deus Ex engines?

[dpjudas]

There are some differences - how big they are I don't know. In any case, UTEngine would have to be able to run UT itself properly before it makes any sense to add more games to it.

[GermanAizek]

@dpjudas,
I tried to download today, setup reading ini, files, but there is a problem he cannot find the 'gameinfo' class in function LoadMap()
"DeusEx.DeusExGameInfo" which is specified in 'DefaultGame'
I have brought up a list packages and I cannot get 'UObject' and classes from 'DeusEx' package (DeusEx.u file in System)
But from 'DeusExSounds.u' package I can read classes, why so?

[dpjudas]

It is probably because in PackageManager::GetIniValue it assumes the .ini file is called UnrealTournament.ini. Even if it did manage to read that it will probably run into trouble with the meshes as I believe DeusEx changed the vertex format. At least I think I remember seeing something like that in the UShock codebase once.

[GermanAizek]

@dpjudas I removed the mention of UnrealTournament and UnrealI and UnrealShare

if (File::try_open_existing(FilePath::combine(path, "System/DeusEx.ini")))
	{
		folder.name = "DeusEx";
		folder.launchInfo.folder = path;
		folder.launchInfo.engineVersion = 226;
	}

if (iniName == "system" || iniName == "System")
		iniName = "DeusEx"/*unreal1 ? "Unreal" : "UnrealTournament"*/;
	else if (iniName == "user")
		iniName = "User";

I also tried to run with 'Engine.GameInfo', which led to fact that there is no native function

Script execution error:

Unknown native function LevelInfo.InitEventManager

Call stack:

LevelInfo.PreBeginPlay line 178

[GermanAizek]

LevelInfo.InitEventManager reference documention:
https://beyondunrealwiki.github.io/pages/levelinfo-dx.html

LevelInfo contains information about the current level. There should be one per level and it should be actor 0. UnrealEd creates each level's LevelInfo automatically so you should never have to place one manually.

The ZoneInfo properties in the LevelInfo are used to define the properties of all zones which don't themselves have ZoneInfo.

    UT has nativereplication on the class
    UT property VisibleGroups()
    UT property bLowRes()
    DX property EventManager()
    DX event ServerTravel() changed
    DX new function InitEventManager()

[dpjudas]

I pushed an update where it detects Deus Ex and loads its meshes. But yeah next thing it bailed on was calling LevelInfo.InitEventManager

[dpjudas]

Fixing that made it miss DeusExPlayer.CreateDumpLocationObject. So probably a few native classes that needs to be defined for it to even try do anything. :)

[GermanAizek]

@dpjudas
Did I understand correctly that I need to restore InitEventManger function? because when exporting native functions, I have it

void NLevelInfo::InitEventManager(UObject* Self)
{
	throw std::runtime_error("LevelInfo.InitEventManager not implemented");
}

[dpjudas]

If you throw an exception in the function then when unrealscript calls it UTEngine will shut down. I opted for making it do nothing instead. Then it complains about another missing native function on the DeusExPlayer class.

[GermanAizek]

in this project, function InitEventManager was ignored, but how efficient it is I do not know
https://github.com/Dx-Reborn/_DXR/blob/0f934fe91773463da9d0f649e9c8d758e2615d14/DeusEx/Classes/DeusExLevelInfo.uc#L32

[GermanAizek]

I noticed that you added commits, now I will take them.

[dpjudas]

Seems at least these bindings has to be added as well:

// native Functions
native(1099) final function string GetDeusExVersion();
native(2100) final function ConBindEvents();
native(3001) final function name SetBoolFlagFromString(String flagNameString, bool bValue);
native(3002) final function ConHistory CreateHistoryObject();
native(3003) final function ConHistoryEvent CreateHistoryEvent();
native(3010) final function DeusExLog CreateLogObject();
native(3011) final function SaveGame(int saveIndex, optional String saveDesc);
native(3012) final function DeleteSaveGameFiles(optional String saveDirectory);
native(3013) final function GameDirectory CreateGameDirectoryObject();
native(3014) final function DataVaultImageNote CreateDataVaultImageNoteObject();
native(3015) final function DumpLocation CreateDumpLocationObject();
native(3016) final function UnloadTexture(Texture texture);

There are probably more of them. Too bad my --extract-nativeobj helper crashes so we can't get a complete dump of them easily.

[dpjudas]

I pushed another update that adds empty handlers for all the native functions in new classes from the DeusEx.u package. Question now is how many of them actually have to be implemented (or do nothing) for the game to actually start up. :)

[GermanAizek]

@dpjudas b12ea9d
a big green ion storm logo after start?

[dpjudas]

Pretty much! :)

On the plus side it boots the game and plays the music. It probably doesn't render the right thing due to those native functions not doing anything (in particular the ones that return null when they were supposed to return an object).

As you can see, UTEngine is pretty close to be able to render/run this game, and yet at the same pretty far with all that Deus Ex specific native code they added.