skyjake/Doomsday-Engine ? reverse-engineered prompt

Build me a working desktop app for playing Doom, Heretic, and Hexen from source, using the Doomsday Engine code in this repo.

I want it to compile cleanly, launch on Windows, Linux, and macOS, and give me a polished enhanced game experience with better graphics, sound, and input support. Make sure the app can load the game data, open in a usable window, and include the core features needed for a modern source port like settings, rendering, audio, and basic UI. If you need anything from the current docs or dependency setup, look it up online and follow the latest instructions.

Please keep the build and run experience as simple as possible, so I can get from a fresh checkout to a playable game without fighting the setup.