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DoomLoader, which was used to load up .WAD file in Unity, has source freely available: https://www.doomworld.com/forum/topic/98682-doomloader-for-unity/. DOOM1.WAD is shareware and can be downloaded here.

As for shader code, I don't think I'm comfortable sharing that ugly mess. :)

I'd still like to see if I can't improve on your shader. ༼ つ ◕_◕ ༽つ Give code plz