You are correct that it is very simple for a Quake 3 engine - the submission's title is misleading. Calling it "basically a wrapper around some libraries" is a

You are correct that it is very simple for a Quake 3 engine - the submission's title is misleading. Calling it "basically a wrapper around some libraries" is a bit harsh though. It's not like it's loading up libloadandrenderaquake3map.so! From a quick glance at the code it implements opening a .bsp file, representing it in memory, and rendering it with direct OpenGL calls. This is pretty close to the metal, so to speak.