Neo Geo palette colors support in NeoVim

[sasja-san]

The maintainer for the colorizer plugin was really nice and just whipped up the whole thing for us (except for the flipped darkness bit):
catgoose/nvim-colorizer.lua#217 (comment)

If you use Neovim there's probably no reason to not use this. I have it set up so that I toggle colorizer on/off with <leader>c.

[dciabrin]

Cross posting here for reference:

@sasja-san you've opened a can of worms here... @yo6snap has started a rabbit hole investigation into it and he convinced me that it is not at all behaving as what I wrote in this python function you mentioned.

I've modified gngeo to match what I thought was the correct semantics, but it turned out to be false after I've tested it on real hardware.

So until I come with a lengthy explanation based on what @yo6snap did, it's best to consider now the following:

• disregard the shadow bit for the time being, and consider a neo geo palette is really a 15bits RGB value (5bits for each component).
• just set the shadow bit for black color on the very first color of your palette.

Sounds like a teaser or a half answer.. bear with me I hope to come up with a nicer explanation soon.

[sasja-san]

Interesting! 🕵️‍♂️

I'm not that concerned with getting it exactly right just yet. I mostly want something that I can have in my code so that when I go use some structure in RAM with an enum like this:

enum bubble_type { bt_red, bt_green, bt_blue, bt_yellow, bt_special, bt_empty };
enum bubble_type bub_field_p1[8][14];

And I want to map it to the correct palette for my bubble construction, then I can just look at the colors in my code and pick correct one. Here you see the level at which I'm dealing with this:

So if this eventually becomes solved, I'll make sure to update the colorizer code. But having a bad version of this is a lot more convenient than having nothing at all 🙃