Andre Duvoisin

TBC, this is an old-school software ray-caster that draws pixels directly into a buffer and then converts it to a UIImage 60 times per second. It's not using OpenGL or Metal (except indirectly via UIKit's display compositing)

It's not quite as old-school as the original engine from 1991 of course. For example I didn't have to figure out how to do linear algebra using only 16-bit integers and no floating point coprocessor!

I implemented most of the features from the original, such as sliding doors and secret push-walls. I also added new stuff like floor and ceiling textures, bullet impacts, diagonal walls, movable scenery, head bob and weapon sway.

I'm not quite sure what to do with it now. I can't release it in its current form due to IP infringement (not the code, but all the textures and sprites), but I'll probably try to open-source it in some form eventually.

All those options are equally cool but since there is no option “all of that above” I’d leane towards combining “release the source” and “coding tutorial” option

If I write a tutorial it will include the source.