If you found this plugin in the top twenty something plugins download. Go to the release section on Github to find the presets file it needs.

Glass Metallic Marble Text GEGL Gimp Plugin

GEGL plugin that strongly benefits from built in presets. User will have to follow one special direction to get built in presets.

SPECIAL LOCATION TO PUT GimpGegl-lb-gmm-config.settings -THIS IS NOT WHERE THE PLUGIN GOES

THIS IS THE PRESET LIST *if you have 2.99 replace 2.10 with 2.99 or 3.0 when Gimp 3 is released.

Windows Normal
C:\Users\USERNAME\AppData\Roaming\GIMP\2.10\filters

Linux Normal

/home/USERNAME/.config/GIMP/2.10/filters

Linux Flatpak and Chrome book
/home/USERNAME/.var/app/org.gimp.GIMP/config/GIMP/2.10/filters

OS specific location to put GEGL Filter binaries

Windows

C:\Users\USERNAME\AppData\Local\gegl-0.4\plug-ins

Linux

/home/(USERNAME)/.local/share/gegl-0.4/plug-ins

Linux (Flatpak)

/home/(USERNAME)/.var/app/org.gimp.GIMP/data/gegl-0.4/plug-ins

Compiling and Installing

Linux

To compile and install you will need the GEGL header files (libgegl-dev on Debian based distributions or gegl on Arch Linux) and meson (meson on most distributions).

meson setup --buildtype=release build ninja -C build

If you have an older version of gegl you may need to copy to ~/.local/share/gegl-0.3/plug-ins instead (on Ubuntu 18.04 for example). Windows

The easiest way to compile this project on Windows is by using msys2. Download and install it from here: https://www.msys2.org/

Open a msys2 terminal with C:\msys64\mingw64.exe. Run the following to install required build dependencies:

pacman --noconfirm -S base-devel mingw-w64-x86_64-toolchain mingw-w64-x86_64-meson mingw-w64-x86_64-gegl

Then build the same way you would on Linux:

meson setup --buildtype=release build ninja -C build

More previews of this based Gimp plugin here