These shader presets are unmodified files from libretro/slang-shaders
(https://github.com/libretro/slang-shaders, commit e1d75632a205c70f14a4cc947c46d5abb7b3f7f1).
They are separate data files loaded at runtime; each keeps its own license as stated
in its file header or LICENSE file. GPL/LGPL texts are in LICENSES/. The corresponding
source is these files themselves (they are compiled at runtime from source).
