crt.js: the CRT monitors of DOSBox Staging, for still pictures, in WebGL2

A port of the shaders behind DOSBox Staging's adaptive CRT settings (crt-auto, crt-auto-machine and crt-auto-arcade),
from its resources/glshaders/crt folder, version 0.82. https://www.dosbox-staging.org/
Ported to WebGL2 and changed for this site by The Paninos off-line, October and November 2026.

What it contains:

1. crt-hyllian with DOSBox Staging's presets.
   Copyright (C) 2020-2024 The DOSBox Staging Team
   Copyright (C) 2011-2020 Hyllian - sergiogdb@gmail.com
   Copyright (C) 2020, this file ported from Libretro's GLSL shader crt-hyllian.glslp to DOSBox-compatible format
   by Tyrells.
   MIT licence: the full notice is in crt-hyllian-MIT.txt, next to this file, and at the top of crt.js.
   Its mask functions are by hunterk (public domain).

2. 'vga-1080p' and 'vga-1080p-fake-double-scan'.
   Copyright (C) 2020-2024 The DOSBox Staging Team
   Based on parts of the Caligari shader plus bits and pieces from Hyllian, Easymode, and probably a few others.
   GNU General Public License, version 2 or later.

3. Curvature and rounded corners from crt-guest-advanced-hd (its pass2 and deconvergence-hd passes).
   Copyright (C) 2018-2025 guest(r)
   The vignette from its pre-shaders-afterglow pass.
   Copyright (C) 2019-2025 guest(r) and Dr. Venom
   GNU General Public License, version 2 or later.
   https://github.com/libretro/slang-shaders/tree/master/crt/shaders/guest/hd

As a whole, 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. It 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.

The licence text is in GPL-2.0.txt, next to this file.
The source of the port is crt.js itself, served unminified at the root of the site.