Unreasonably effective – How video games use LUTs and how you can too

• jslens

  1 0 - HTML

  A small Javascript amusement

They are extra useful to precalculate other visual effects. In the past, following a magazine tutorial, I coded a very cheap raytraced "lens effect" on a 286. I recently (5 years ago!) ported it to js [0].

That magazine got me into fractals and raytracing, BTW.

[0] https://github.com/luismedel/jslens

• DOOM-FX

  9 1,168 2.6 Assembly

  Doom/FX for Super Nintendo with SuperFX GSU2A

A Podcast Of Unnecessary Detail just did an episode talking about the SNES Doom port and how it used LUTs for trigonometry as the SNES didn't have a graphics processor.

https://festivalofthespokennerd.com/podcast/series-3-episode...

https://github.com/RandalLinden/DOOM-FX

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• gfxcat

  1 36 6.4 JavaScript

  A catalog of my old-school GFX effects

- see it live: https://htmlpreview.github.io/?https://github.com/sylefeb/gf...

• gf

  1 - -

- source code: https://github.com/sylefeb/gfxcat/blob/main/raytrace/raytrac...

And of course procedural textures!! Perlin noise is made of lookup tables, and often multiple lookups are combined to then lookup a clolormap (https://redirect.cs.umbc.edu/~ebert/691/Au00/Notes/procedura...)

There are so many other examples. Also, FPGAs are quite literally made

• Silice

  10 1,230 9.2 C++

  Silice is an easy-to-learn, powerful hardware description language, that simplifies designing hardware algorithms with parallelism and pipelines.

- how it is computed: https://github.com/sylefeb/Silice/blob/master/projects/ice-v...

Julia fractal, with a table to do integer multiply! (2.a.b = (a+b)^2 - a^2 - b^2, so just precompute all x^2 in a table! )

• tinygpus

  2 84 4.6 Lua

  TinyGPUs, making graphics hardware for 1990s games

- actual lookup table generation: https://github.com/sylefeb/tinygpus/blob/498be1b803d0950328a...

Sine tables are also very typical, for animating things on screen or plain

• Silixel

  1 51 - Verilog

  Exploring gate level simulation

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