DIYDoom
gebbdoom
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DIYDoom
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QCVM: Bite-sized QuakeC VM written in C
Don't sell yourself short, I imagine you could achieve a lot more than you think! It's just a case of breaking the problem down, simplifying accordingly and (probably the most difficult bit) finding the time to sit down and work on it. There are some DIY courses that could even be followed and mashed up to approximate a scriptable "3D" engine with a bit of creativity. You could familiarise yourself with building a simple compiler + VM for a little language by following "Crafting Interpreters" (https://craftinginterpreters.com). For the engine side of things someone recently posted this "DIY Doom" over @ https://github.com/amroibrahim/DIYDoom which looks like a bit of fun.
I mean it's a bit tougher to do it all completely from scratch, but I reckon most HNers could get quite a lot of the way there :)
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Game Engine Black Book: Doom [pdf]
see also a tutorial on writing a doom-compatible engine from scratch:
https://github.com/amroibrahim/DIYDoom
they also have a community forum, diyidtech, at https://discord.gg/a8n4Y2z
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How hard is to convert C++ code to C?
For reference, I want to convert this C++ code (https://github.com/amroibrahim/DIYDoom/tree/master/DIYDOOM/Notes001/notes)
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Rustenstein 3D: Game programming like it's 1992
see also: a series of posts (with accompanying code) on rewriting the doom engine from scratch:
https://github.com/amroibrahim/DIYDoom
- Can you share some resources that show how to make a rudimentary DOOM game and how stuff works?
gebbdoom
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Game Engine Black Book: Doom [pdf]
A few years ago I wrote to the author to express gratitude for them writing this book (I also purchased a hard copy to express an additional $0.77 worth of gratitude). One thing I notice hasn't been mentioned yet which is cool is that the entire source code for the book is on GitHub: https://github.com/fabiensanglard/gebbdoom
What are some alternatives?
VoxelSpace - Terrain rendering algorithm in less than 20 lines of code
Portal-Raycaster - A software portal rendering game engine
dhewm3 - dhewm 3 main repository
rustenstein - Wolfenstein 3D port written in Rust
REminiCRT - Flashback with CRT emulation shader
qzdl - Qt version of BioHazard's ZDL
qwpython - QuakeWorld dedicated server wrapped up as a Python module, QuakeC -> Python game translator
rust-doom - A Doom Renderer written in Rust.
bsc.wad - 3 new episodes for Doom 2. For GZDoom & ZDoom
WiiWare-Patcher - WiiWare patching for Wiimmfi made easy.
Q-Zandronum - A Zandronum 3.0 fork with improved netcode, configurable movement and many small tweaks
minisynth32 - A 3D-printable MIDI synthesiser inspired by the Roland MT-32 and clumsyMIDI, and powered by the mt32-pi MT-32 emulator.