I think that’s how the open source ports of Doom and Quake work. The shareware files are enough to get it up and running, since they’re free to distribute.
As for the engine in this specific case, it’s Unreal, possibly without any modification, so the engine is already available with source.
cryptiod137@lemmy.world 10 months ago
Good question, yeah probably like some other community remakes where you need the original files.
Probably a moot point as the engine itself isn’t open source, although I guess they could give out the project file.