Fabian Greffrath
Software Engineer
Witten, North Rhine-Westphalia, Germany
Summary
🤩
RockstarFabian Greffrath is a software engineer with 18 years of experience who brings a rare blend of academic rigor—he's a graduate physicist with a Ph.D. in mechanical engineering—and deep practical expertise in systems-level C development. Based in Witten, Germany, he is an active Debian developer and long-time open-source contributor to prominent Doom source ports like Chocolate Doom and Crispy Doom, where he improved compatibility, rendering, automap controls, demo recording, and robust savegame and file-path handling. His work shows a knack for preserving historical accuracy while modernizing usability, from adding PNG screenshot support to nuanced BFG Edition IWAD workarounds. Equally comfortable debugging low-level memory issues and refining user-facing interactions, he combines meticulous engineering with a hacker’s curiosity—evident in his “Doom hacker” roots.
17 years of coding experience
Github Skills (15)
c1710
c-language10
game-development10
c1110
game-engine10
cprogramming-language10
game-dev10
file-handling9
user-interface9
low-level-programming8
data-structures8
sdl8
data-structure8
leveldb7
om6
Programming languages (12)
Github contributions (5)
fabiangreffrath/crispy-doom
Mar 2014 - Jan 2023
Crispy Doom is a limit-removing enhanced-resolution Doom source port based on Chocolate Doom.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:49 releases, 435 reviews, 2401 commits in 9 years
Contributions summary:Fabian primarily contributed to the automap functionality of the game engine, adding and modifying features such as panning, zooming, and handling of the mouse wheel for more intuitive control. They also fixed bugs related to widescreen rendering and implemented a demo-reel system that allowed recording and playback of demos. Furthermore, the user optimized existing code and introduced additional level statistics.
gameuncapped-frameratedemo-compatiblemouselooklimit-removing
chocolate-doom/chocolate-doom
Jan 2014 - Oct 2022
Chocolate Doom is a Doom source port that is minimalist and historically accurate.
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 release, 195 reviews, 368 commits in 8 years 10 months
Contributions summary:Fabian primarily focused on enhancing the Chocolate Doom source port, making it more compatible with the Doom 3: BFG Edition. They improved the handling of the BFG Edition's IWAD files by adding workarounds for missing and modified game resources, particularly focusing on title and menu graphics. Furthermore, the user implemented features for re-binding artifact keys in Hexen and added PNG screenshot support to the game, with the addition of a dedicated keybind and associated menu. Finally, the user fixed several issues involving savegames, memory and file paths.
gamegplv2gamessdlminimalist
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.