GLSL shader SLANG equivalent

demodanza · 23 May 2023 05:13

Hi! I have been using this great and lightweight shader:

libretro/glsl-shaders/blob/master/crt/shaders/crt-guest-cgwg-curvature.glsl

/*
   CRT - Guest mini
   edited by metallic77
   
   Copyright (C) 2017-2018 guest(r) - [email protected]

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

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Sadly it doesn’t have a SLANG equivalent. There’s crt-gdv-mini.slang, that has the same parameters, but the scanlines interact with the colors differently and it’s not adaptive as the former, so the scanlines don’t go away in higher resolution content and moire creeps in.

If a more tech savvy person could help me with it, would be great, as I don’t really know how to code. In any case, thanks for all the work by developers and community.

DariusG · 23 May 2023 05:57

I will bring it 1:1 with GLSL.

demodanza · 23 May 2023 07:11

Oh! It would be awesome if you could!!

Is there also a way for the corners to not pixelate unevenly when curving the image with warp parameters? It only happens in higher res content, as it curves smoothly in 240p. I assume this may means rewriting the code or making it heavier on resources, so if that’s the case forget what I said, as having it in slang would be cool enough.

DariusG · 23 May 2023 07:21

It’s nothing special already did and pushed a PR to slang repository. To say the truth i knew it was different in slang and wanted to change it. Slang port was an older version of gdv-mini not done by me (i think was done by HSM).

demodanza · 23 May 2023 07:58

Awesome! Thank you, have a great week!

HyperspaceMadness · 23 May 2023 13:10

Great! Thanks for the update!