Channel swap plugin for gimp 3.x (Convert ZBP texture to be compatible with Blender)

channel_swap.py

#!/usr/bin/env python3

# Store this file in blender plug-ins directory, e.g. /xxx/GIMP/3.0/plug-ins/channel_swap

import sys

import gi
gi.require_version('Gimp', '3.0')
from gi.repository import Gimp
gi.require_version('GimpUi', '3.0')
from gi.repository import GimpUi
from gi.repository import GLib
from gi.repository import Gio
from pathlib import Path

class VdmChannelMixer(Gimp.PlugIn):
    def do_query_procedures(self):
        return ['blender-vdm-channel-mixer']

    def do_create_procedure(self, name):
        procedure = Gimp.ImageProcedure.new(self, name, Gimp.PDBProcType.PLUGIN, self.run, None)
        procedure.set_image_types("RGB*")
        procedure.set_menu_label("Channel swap (VDM compatible with Blender)")
        procedure.set_documentation("Swap green and blue channels. Green -> Blue 2.0; Blue -> Green 2.0.", "Swap green and blue channels so it's compatible with Blender VDM textures.", "")
        procedure.set_attribution("scmanjarrez", "scmanjarrez", "2025")
        procedure.add_menu_path('<Image>/Filters/BlenderVDM/')
        return procedure

    def run(self, procedure, run_mode, image, drawables, config, run_data):
        for img in Gimp.get_images():
            # Backup original file
            path = Path(img.get_file().get_path())
            orig_file = Gio.File.new_for_path(str(path.with_stem(f"{path.stem}_original")))
            img.get_file().copy(orig_file, Gio.FileCopyFlags(0), None, None, None)
            
            # Swap channels
            layer = img.get_layers()[0]
            gaussian_filter = Gimp.DrawableFilter.new(layer, "gegl:channel-mixer", "")
            gaussian_filter_config = gaussian_filter.get_config()
            gaussian_filter_config.set_property('bg-gain', 2.0)
            gaussian_filter_config.set_property('gg-gain', 0.0)
            gaussian_filter_config.set_property('bg-gain', 2.0)
            gaussian_filter_config.set_property('bb-gain', 0.0)
            gaussian_filter.update()
            layer.merge_filter(gaussian_filter)
            
            # Save the file
            Gimp.file_save(Gimp.RunMode(1), img, img.get_file(), None)
        return procedure.new_return_values(Gimp.PDBStatusType.SUCCESS, GLib.Error())

Gimp.main(VdmChannelMixer.__gtype__, sys.argv)