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I've spent a couple of days playing around with the raylib library and cl-raylib lisp bindings.
https://github.com/raysan5/raylib
https://github.com/longlene/cl-raylib
Raylib is a pretty nice minimal library for constructing games, kind of a modernized SDL. It does not a game engine, it's just a way to construct a frame loop and an api with useful code for drawing, texture-mapping, loading shaders and whatnot.
The CL bindings in cl-raylib are buggy and possibly incomplete, but usable for the simplest of demos. I am pretty good with CFFI and debugging, so within the first day I managed to fix a couple of bugs and convert another example. Feels pretty good to enjoy coding again.
I've always loved the old, oscilloscope-like vector displays. It was probably photos of Space War that really got me into programming, and I still have a Vectrex game box sitting in storage... The real vector displays are long gone, but modern GPUs can draw a lot of vectors in a 60th of a second.
Although raylib is not specifically built for that, it draws vectors pretty well. At the end of day two I had a smoothly rotating Asteroids-like ship. And raylib suports vector strips, which are a lot like 'display lists' of 50 years ago.
So I had this idea of putting together a little vector-display-list engine in C with a simple API, and driving it from Lisp or anything with lists of vectors to draw. Raylgun seems to be an apt name for the project.
To be continued.