Doom Source Code

[Blastfrog]

OP, unless your intentions are to make your own port, you really shouldn't be doing this. I suspect the only reason you're looking into it is because people were saying in your other thread that it's the only way to get behavior changes more complex than what DeHacked offers in the original engine.

If all you're trying to do are define new objects, you should use an existing engine and its content definition language. Decorate for ZDoom, EDF for Eternity, DDF for 3DGE, DED for Doomsday, etc.

If you're intending to do more than that, I don't want to discourage you. But if you aren't, I want to make sure you're not wasting your time with something mostly irrelevant to your goals.