8bit - Dither/Shaded Palette

[Rachael]

Using a trick discovered by DenisBelmondo to downmix a table LUT to the currently loaded game palette - I did my own take on palette dithering - plus I also did a "shaded" (or "blended") palette mode which preserves the original brightness of every pixel in the image but transitions it to 8-bit colors.

This comes in 5 modes which is accessible in the Display Options menu on both GZDoom and Raze. (The 5th being simply "off")

Note that this requires a devbuild of either GZDoom or Raze in order to function properly.

"Classic" - which is basically the palette tonemap:

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"Checkerboard" - error diffusion dither to a single level:

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"Square" - 2x2 error diffusion dither to 3 levels:

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"Shaded" - The image is downmixed to a palette but it is blended and the brightness is readjusted according to the original pixel (it gives a very "advanced retro" feel):

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Github: https://github.com/madame-rachelle/8bit

License: 3-clause BSD for the code, CC-BY for the image (allows derivative works, only attribution required)

8bit.pk3

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8bit.pk3

8bit.pk3

[Rachael]

New version - added EGA palette options.

Screenshot_Doom_20220207_192643.png

To emulate EGA resolutions:
vid_setscale 320 200 0 1.2 - 320x200
vid_setscale 640 200 0 2.4 - 640x200
vid_setscale 640 350 1 1.3714 - 640x350
vid_setscale 640 480 1 1 - 640x480 (VGA)

[Nash]

Man, I'm spoiled for choice with all of these retro shaders.

Thank you for putting this out, Rachael!

[Rachael]

Thank you for the kind comment, Nash

[axredneck]

This needs to be integrated into GZDoom/Raze

[Rachael]

Updated - added two new 16-color options, added tweaking options for the error diffusion dither. Can increase the square size (and diffusion level), as well as change the diffusion bias.

[axredneck]

Code: Select all • Expand view

Script error, /home/redneck/games/doom/8bit/:gldefs.txt line 40: Unknown keyword 'cvar_uniform'

It's GZDoom from today's git master.

[Rachael]

Works fine for me. Where'd you get that copy of GZDoom?

I freshly compiled mine from the master branch and it accepts this shader without errors.

Here is mine, for whatever it might be worth. https://cdn.discordapp.com/attachments/ ... -02-17.zip

You'll have to pull the .dll's from GZDoom 4.7.1 for this to work. Or just overwrite an existing copy; that works too.

[axredneck]

I freshly compiled mine from the master branch...

So did i.

You'll have to pull the .dll's...

I'm on Linux.

it accepts this shader without errors

It's not shader but gldefs that gives error.

[axredneck]

Tried pk3 instead of your github repo - it gives this (almost the same) error:

Code: Select all • Expand view

Script error, 8bit.pk3:gldefs.txt line 40:
Unknown keyword 'cvar_uniform

So it's not something i did wrong with your repo.

[Rachael]

I don't think you're on master then. Check with git describe --tags and git branch.

As of this post, git describe --tags should return the following output:

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g4.8pre-229-gc926b7533

[axredneck]

Code: Select all • Expand view

> git fetch --tags
g4.7.1

Yes, my bad. I thought i'm on master for some reason...
I switched to master - now everything works. Thank You! Great mod!

[axredneck]

Oh, i still have a problem: settings of this mod aren't saved between GZDoom sessions for some reason.

[Rachael]

Yeah that unfortunately is something I am having a bit of trouble with right now, I hope to have that solved soon. It's because of the new shader uniform system.

[Randomguy7]

I don't see a mod menu, but I see that there's an option pal_mode... what does 1 2 3 and 4 translate to? edit: nvm I found it lol