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Show HN: TTF-DOOM – A raycaster running inside TrueType font hinting

63 points by 4RH1T3CT0R

by tadfisher

1 subcomments

You are (or I suspect your LLM is) not correct about Doom using a raycasting engine. Wolfenstein fits that description, yes. Doom rather famously introduced BSP for level data and it draws sorted polygons front-to-back without ray-marching.

by kevin_thibedeau

0 subcomment

> TrueType MUL does (ab)/64, not ab
This is how fixed-point arithmetic works. For multiplication of Q26.6 numbers you clear the squared scaling factors (2^6) by dividing/shifting one of them away.

by tombert

1 subcomments

I tried playing the demo, and it was just green bars for me. The walls didn't scale up or shrink, it was just a bunch of solid static green bars.
The enemies did scale up and shrink as I got closer, and the minimap worked.
Tried with Brave on Linux, and Google Chrome on macOS.

by emanuele-em

1 subcomments

Ok the MUL workaround got me. MUL does (ab)/64 so you have to DIV first to get a64, then MUL finally gives you a*b. And recursive FDEFs because there's no WHILE? All in 6.5KB? What kind of frame rate do you actually get out of this?