# SPDX-FileCopyrightText: 2018-2021 The glTF-Blender-IO authors
#
# SPDX-License-Identifier: Apache-2.0

bl_info = {
    'name': 'glTF 2.0 format',
    # This is now displayed as the maintainer, so show the foundation.
    # "author": "Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein", # Original Authors
    'author': "Blender Foundation, Khronos Group",
    "version": (5, 2, 40),
    'blender': (5, 2, 0),
    'location': 'File > Import-Export',
    'description': 'Import-Export as glTF 2.0',
    'warning': '',
    'doc_url': "{BLENDER_MANUAL_URL}/addons/import_export/scene_gltf2.html",
    'tracker_url': "https://github.com/KhronosGroup/glTF-Blender-IO/issues/",
    'support': 'OFFICIAL',
    'category': 'Import-Export',
}


def get_version_string():
    return str(bl_info['version'][0]) + '.' + str(bl_info['version'][1]) + '.' + str(bl_info['version'][2])

#
# Script reloading (if the user calls 'Reload Scripts' from Blender)
#


def reload_package(module_dict_main):
    import importlib
    from pathlib import Path

    def reload_package_recursive(current_dir, module_dict):
        for path in current_dir.iterdir():
            if "__init__" in str(path) or path.stem not in module_dict:
                continue

            if path.is_file() and path.suffix == ".py":
                importlib.reload(module_dict[path.stem])
            elif path.is_dir():
                reload_package_recursive(path, module_dict[path.stem].__dict__)

    reload_package_recursive(Path(__file__).parent, module_dict_main)


if "bpy" in locals():
    reload_package(locals())

import bpy
from bpy.props import (StringProperty,
                       BoolProperty,
                       EnumProperty,
                       IntProperty,
                       FloatProperty,
                       CollectionProperty)
from bpy.types import Operator
from bpy_extras.io_utils import ImportHelper, ExportHelper, poll_file_object_drop
from bpy.app.translations import pgettext_n as n_


#
#  Functions / Classes.
#

exporter_extension_layout_draw = {}
importer_extension_layout_draw = {}


def ensure_filepath_matches_export_format(filepath, export_format):
    import os
    filename = os.path.basename(filepath)
    if not filename:
        return filepath

    stem, ext = os.path.splitext(filename)
    if stem.startswith('.') and not ext:
        stem, ext = '', stem

    desired_ext = '.glb' if export_format == 'GLB' else '.gltf'
    ext_lower = ext.lower()
    if ext_lower not in ['.glb', '.gltf']:
        return filepath + desired_ext
    elif ext_lower != desired_ext:
        filepath = filepath[:-len(ext)]  # strip off ext
        return filepath + desired_ext
    else:
        return filepath


def on_export_format_changed(self, context):

    # Update the filename in collection export settings when the format (.glb/.gltf) changes
    if isinstance(self.id_data, bpy.types.Collection):
        self.filepath = ensure_filepath_matches_export_format(
            self.filepath,
            self.export_format,
        )

    # Update the filename in the file browser when the format (.glb/.gltf)
    # changes
    sfile = context.space_data
    if not isinstance(sfile, bpy.types.SpaceFileBrowser):
        return
    if not sfile.active_operator:
        return
    if sfile.active_operator.bl_idname != "EXPORT_SCENE_OT_gltf":
        return

    sfile.params.filename = ensure_filepath_matches_export_format(
        sfile.params.filename,
        self.export_format,
    )

    # Also change the filter
    sfile.params.filter_glob = '*.glb' if self.export_format == 'GLB' else '*.gltf'
    # Force update of file list, because update the filter does not update the real file list
    bpy.ops.file.refresh()


def on_export_action_filter_changed(self, context):
    if self.export_action_filter is True:
        bpy.types.Scene.gltf_action_filter = bpy.props.CollectionProperty(type=GLTF2_filter_action)
        bpy.types.Scene.gltf_action_filter_active = bpy.props.IntProperty()

        for action in bpy.data.actions:
            if id(action) not in [id(item.action) for item in bpy.data.scenes[0].gltf_action_filter]:
                item = bpy.data.scenes[0].gltf_action_filter.add()
                item.keep = True
                item.action = action

    else:
        if hasattr(bpy.data.scenes[0], 'gltf_action_filter'):
            bpy.data.scenes[0].gltf_action_filter.clear()
            del bpy.types.Scene.gltf_action_filter
            del bpy.types.Scene.gltf_action_filter_active


def get_format_items(scene, context):

    items = (('GLB', n_('glTF Binary (.glb)'),
              n_('Exports a single file, with all data packed in binary form. '
                 'Most efficient and portable, but more difficult to edit later')),
             ('GLTF_SEPARATE', n_('glTF Separate (.gltf + .bin + textures)'),
              n_('Exports multiple files, with separate JSON, binary and texture data. '
                 'Easiest to edit later')))

    addon_preferences = bpy.context.preferences.addons['io_scene_gltf2'].preferences
    if addon_preferences and addon_preferences.allow_embedded_format:
        # At initialization, the preferences are not yet loaded
        # The second line check is needed until the PR is merge in Blender, for github CI tests
        items += (('GLTF_EMBEDDED', n_('glTF Embedded (.gltf)'),
                   n_('Exports a single file, with all data packed in JSON. '
                      'Less efficient than binary, but easier to edit later')
                   ),)

    return items


def is_draco_available():
    # Initialize on first use
    if not hasattr(is_draco_available, "draco_exists"):
        from .io.com import library as gltf2_compression_extension
        is_draco_available.draco_exists = gltf2_compression_extension.dll_exists('bf_intern_draco_bridge', 'Draco')

    return is_draco_available.draco_exists


def is_meshopt_available():
    # Initialize on first use
    if not hasattr(is_meshopt_available, "meshopt_exists"):
        from .io.com import library as gltf2_compression_extension
        is_meshopt_available.meshopt_exists = gltf2_compression_extension.dll_exists(
            'bf_intern_meshopt_bridge', 'MeshOptimizer')

    return is_meshopt_available.meshopt_exists


def set_debug_log():
    import logging
    if bpy.app.debug_value == 0:      # Default values => Display all messages except debug ones
        return logging.INFO
    elif bpy.app.debug_value == 1:
        return logging.WARNING
    elif bpy.app.debug_value == 2:
        return logging.ERROR
    elif bpy.app.debug_value == 3:
        return logging.CRITICAL
    elif bpy.app.debug_value == 4:
        return logging.DEBUG
    else:
        return logging.INFO


class ConvertGLTF2_Base:
    """Base class containing options that should be exposed during both import and export."""

    export_import_convert_lighting_mode: EnumProperty(
        name='Lighting Mode',
        items=(
            ('SPEC', 'Standard', 'Physically-based glTF lighting units (cd, lx, nt)'),
            ('COMPAT', 'Unitless', 'Non-physical, unitless lighting. Useful when exposure controls are not available'),
            ('RAW', 'Raw (Deprecated)', 'Blender lighting strengths with no conversion'),
        ),
        description='Optional backwards compatibility for non-standard render engines. Applies to lights',  # TODO: and emissive materials',
        default='SPEC'
    )


class ExportGLTF2_Base(ConvertGLTF2_Base):
    # TODO: refactor to avoid boilerplate

    bl_options = {'PRESET'}

    # Don't use export_ prefix here, I don't want it to be saved with other export settings
    gltf_export_id: StringProperty(
        name='Identifier',
        description=(
            'Identifier of caller (in case of add-on calling this exporter). '
            'Can be useful in case of Extension added by other add-ons'
        ),
        default=''
    )

    # gltfpack properties
    export_use_gltfpack: BoolProperty(
        name='Use Gltfpack',
        description='Use gltfpack to simplify the mesh and/or compress its textures',
        default=False,
    )

    export_gltfpack_tc: BoolProperty(
        name='KTX2 Compression',
        description='Convert all textures to KTX2 with BasisU supercompression',
        default=True,
    )

    export_gltfpack_tq: IntProperty(
        name='Texture Encoding Quality',
        description='Texture encoding quality',
        default=8,
        min=1,
        max=10,
    )

    export_gltfpack_si: FloatProperty(
        name='Mesh Simplification Ratio',
        description='Simplify meshes targeting triangle count ratio',
        default=1.0,
        min=0.0,
        max=1.0,
    )

    export_gltfpack_sa: BoolProperty(
        name='Aggressive Mesh Simplification',
        description='Aggressively simplify to the target ratio disregarding quality',
        default=False,
    )

    export_gltfpack_slb: BoolProperty(
        name='Lock Mesh Border Vertices',
        description='Lock border vertices during simplification to avoid gaps on connected meshes',
        default=False,
    )

    export_gltfpack_vp: IntProperty(
        name='Position Quantization',
        description='Use N-bit quantization for positions',
        default=14,
        min=1,
        max=16,
    )

    export_gltfpack_vt: IntProperty(
        name='Texture Coordinate Quantization',
        description='Use N-bit quantization for texture coordinates',
        default=12,
        min=1,
        max=16,
    )

    export_gltfpack_vn: IntProperty(
        name='Normal/Tangent Quantization',
        description='Use N-bit quantization for normals and tangents',
        default=8,
        min=1,
        max=16,
    )

    export_gltfpack_vc: IntProperty(
        name='Vertex Color Quantization',
        description='Use N-bit quantization for colors',
        default=8,
        min=1,
        max=16,
    )

    export_gltfpack_vpi: EnumProperty(
        name='Vertex Position Attributes',
        description='Type to use for vertex position attributes',
        items=(('Integer', 'Integer', 'Use integer attributes for positions'),
               ('Normalized', 'Normalized', 'Use normalized attributes for positions'),
               ('Floating-point', 'Floating-point', 'Use floating-point attributes for positions')),
        default='Integer',
    )

    export_gltfpack_noq: BoolProperty(
        name='Disable Quantization',
        description='Disable quantization; produces much larger glTF files with no extensions',
        default=True,
    )

    export_gltfpack_kn: BoolProperty(
        name='Keep Named Nodes',
        description='Restrict some optimization to keep named nodes and meshes attached to named nodes so that named nodes can be transformed externally',
        default=False,
    )

    # TODO: some stuff in Textures

    # TODO: Animations

    # TODO: Scene

    # TODO: some stuff in Miscellaneous

    export_format: EnumProperty(
        name='Format',
        items=get_format_items,
        description=(
            'Output format. Binary is most efficient, '
            'but JSON may be easier to edit later'
        ),
        default=0,  # Warning => If you change the default, need to change the default filter too
        update=on_export_format_changed,
    )

    ui_tab: EnumProperty(
        items=(('GENERAL', "General", "General settings"),
               ('MESHES', "Meshes", "Mesh settings"),
               ('OBJECTS', "Objects", "Object settings"),
               ('ANIMATION', "Animation", "Animation settings")),
        name="ui_tab",
        description="Export setting categories",
    )

    export_copyright: StringProperty(
        name='Copyright',
        description='Legal rights and conditions for the model',
        default=''
    )

    export_image_format: EnumProperty(
        name='Images',
        items=(('AUTO', 'Automatic',
                'Save PNGs as PNGs, JPEGs as JPEGs, WebPs as WebPs. '
                'For other formats, use PNG'),
               ('JPEG', 'JPEG Format (.jpg)',
                'Save images as JPEGs. (Images that need alpha are saved as PNGs though.) '
                'Be aware of a possible loss in quality'),
               ('WEBP', 'WebP Format',
                'Save images as WebPs as main image (no fallback)'),
               ('NONE', 'None',
                'Don\'t export images'),
               ),
        description=(
            'Output format for images. PNG is lossless and generally preferred, but JPEG might be preferable for web '
            'applications due to the smaller file size. Alternatively they can be omitted if they are not needed'
        ),
        default='AUTO'
    )

    export_image_add_webp: BoolProperty(
        name='Create WebP',
        description=(
            "Creates WebP textures for every texture. "
            "For already WebP textures, nothing happens"
        ),
        default=False
    )

    export_image_webp_fallback: BoolProperty(
        name='WebP Fallback',
        description=(
            "For all WebP textures, create a PNG fallback texture"
        ),
        default=False
    )

    export_texture_dir: StringProperty(
        name='Textures',
        description='Folder to place texture files in. Relative to the .gltf file',
        default='',
    )

    # Keep for back compatibility
    export_jpeg_quality: IntProperty(
        name='JPEG Quality',
        description='Quality of JPEG export',
        default=75,
        min=0,
        max=100
    )

    # Keep for back compatibility
    export_image_quality: IntProperty(
        name='Image Quality',
        description='Quality of image export',
        default=75,
        min=0,
        max=100
    )

    export_keep_originals: BoolProperty(
        name='Keep Original',
        description=('Keep original textures files if possible. '
                     'WARNING: if you use more than one texture, '
                     'where pbr standard requires only one, only one texture will be used. '
                     'This can lead to unexpected results'
                     ),
        default=False,
    )

    export_texcoords: BoolProperty(
        name='UVs',
        description='Export UVs (texture coordinates) with meshes',
        default=True
    )

    export_normals: BoolProperty(
        name='Normals',
        description='Export vertex normals with meshes',
        default=True
    )

    export_gn_mesh: BoolProperty(
        name='Geometry Nodes Instances (Experimental)',
        description='Export Geometry nodes instance meshes',
        default=False
    )

    export_meshopt_compression_enable: BoolProperty(
        name='Meshopt Compression',
        description='Compress mesh using Meshopt',
        default=False
    )

    export_meshopt_extension: EnumProperty(
        name='Meshopt Extension',
        items=(
            ('EXT_meshopt_compression',
             'EXT_meshopt_compression',
             'Use EXT_meshopt_compression extension for mesh compression'),
            ('KHR_meshopt_compression',
             'KHR_meshopt_compression',
             'Use KHR_meshopt_compression extension for mesh compression'),
        ),
        description='Extension to use for meshopt compression',
        default='EXT_meshopt_compression',
    )

    export_draco_mesh_compression_enable: BoolProperty(
        name='Draco Mesh Compression',
        description='Compress mesh using Draco',
        default=False
    )

    export_draco_mesh_compression_level: IntProperty(
        name='Compression Level',
        description='Compression level (0 = most speed, 6 = most compression, higher values currently not supported)',
        default=6,
        min=0,
        max=10
    )

    export_draco_position_quantization: IntProperty(
        name='Position Quantization Bits',
        description='Quantization bits for position values (0 = no quantization)',
        default=14,
        min=0,
        max=30
    )

    export_draco_normal_quantization: IntProperty(
        name='Normal Quantization Bits',
        description='Quantization bits for normal values (0 = no quantization)',
        default=10,
        min=0,
        max=30
    )

    export_draco_texcoord_quantization: IntProperty(
        name='Texcoord Quantization Bits',
        description='Quantization bits for texture coordinate values (0 = no quantization)',
        default=12,
        min=0,
        max=30
    )

    export_draco_color_quantization: IntProperty(
        name='Color Quantization Bits',
        description='Quantization bits for color values (0 = no quantization)',
        default=10,
        min=0,
        max=30
    )

    export_draco_generic_quantization: IntProperty(
        name='Generic Quantization Bits',
        description='Quantization bits for generic values like weights or joints (0 = no quantization)',
        default=12,
        min=0,
        max=30
    )

    export_tangents: BoolProperty(
        name='Tangents',
        description='Export vertex tangents with meshes',
        default=False
    )

    export_materials: EnumProperty(
        name='Materials',
        items=(
            ('EXPORT',
             'Export',
             'Export all materials used by included objects'),
            ('PLACEHOLDER',
             'Placeholder',
             'Do not export materials, but write multiple primitive groups per mesh, keeping material slot information'),
            ('VIEWPORT',
             'Viewport',
             'Export minimal materials as defined in Viewport display properties'),
            ('NONE',
             'No export',
             'Do not export materials, and combine mesh primitive groups, losing material slot information')),
        description='Export materials',
        default='EXPORT')

    export_unused_images: BoolProperty(
        name='Unused Images',
        description='Export images not assigned to any material',
        default=False)

    export_unused_textures: BoolProperty(
        name='Prepare Unused Textures',
        description=(
            'Export image texture nodes not assigned to any material. '
            'This feature is not standard and needs an external extension to be included in the glTF file'
        ),
        default=False)

    export_vertex_color: EnumProperty(
        name='Use Vertex Color',
        items=(
            ('MATERIAL', 'Material',
             'Export vertex color when used by material'),
            ('ACTIVE', 'Active',
             'Export active vertex color'),
            ('NAME', 'Name',
             'Export vertex color with this name'),
            ('NONE', 'None',
             'Do not export vertex color')),
        description='How to export vertex color',
        default='MATERIAL'
    )

    export_vertex_color_name: StringProperty(
        name='Vertex Color Name',
        description='Name of vertex color to export',
        default='Color'
    )

    export_all_vertex_colors: BoolProperty(
        name='Export All Vertex Colors',
        description=(
            'Export all vertex colors, even if not used by any material. '
            'If no Vertex Color is used in the mesh materials, a fake COLOR_0 will be created, '
            'in order to keep material unchanged'
        ),
        default=True
    )

    export_active_vertex_color_when_no_material: BoolProperty(
        name='Export Active Vertex Color When No Material',
        description='When there is no material on object, export active vertex color',
        default=True
    )

    export_attributes: BoolProperty(
        name='Attributes',
        description='Export Attributes (when starting with underscore)',
        default=False
    )

    use_mesh_edges: BoolProperty(
        name='Loose Edges',
        description=(
            'Export loose edges as lines, using the material from the first material slot'
        ),
        default=False,
    )

    use_mesh_vertices: BoolProperty(
        name='Loose Points',
        description=(
            'Export loose points as glTF points, using the material from the first material slot'
        ),
        default=False,
    )

    export_cameras: BoolProperty(
        name='Cameras',
        description='Export cameras',
        default=False
    )

    use_selection: BoolProperty(
        name='Selected Objects',
        description='Export selected objects only',
        default=False
    )

    use_visible: BoolProperty(
        name='Visible Objects',
        description='Export visible objects only',
        default=False
    )

    use_renderable: BoolProperty(
        name='Renderable Objects',
        description='Export renderable objects only',
        default=False
    )

    use_active_collection_with_nested: BoolProperty(
        name='Include Nested Collections',
        description='Include active collection and nested collections',
        default=True
    )

    use_active_collection: BoolProperty(
        name='Active Collection',
        description='Export objects in the active collection only',
        default=False
    )

    use_active_scene: BoolProperty(
        name='Active Scene',
        description='Export active scene only',
        default=False
    )

    collection: StringProperty(
        name="Source Collection",
        description="Export only objects from this collection (and its children)",
        default="",
    )

    # Not starting with "export_", as this is a collection only option
    at_collection_center: BoolProperty(
        name="Export at Collection Center",
        description="Export at Collection center of mass of root objects of the collection",
        default=False,
    )

    export_extras: BoolProperty(
        name='Custom Properties',
        description='Export custom properties as glTF extras',
        default=False
    )

    export_yup: BoolProperty(
        name='+Y Up',
        description='Export using glTF convention, +Y up',
        default=True
    )

    export_apply: BoolProperty(
        name='Apply Modifiers',
        description='Apply modifiers (excluding Armatures) to mesh objects -'
                    'WARNING: prevents exporting shape keys',
        default=False
    )

    export_shared_accessors: BoolProperty(
        name='Shared Accessors',
        description='Export Primitives using shared accessors for attributes',
        default=False
    )

    export_animations: BoolProperty(
        name='Animations',
        description='Exports active actions and NLA tracks as glTF animations',
        default=True
    )

    export_frame_range: BoolProperty(
        name='Limit to Playback Range',
        description='Clips animations to selected playback range',
        default=False
    )

    export_frame_step: IntProperty(
        name='Sampling Rate',
        description='How often to evaluate animated values (in frames)',
        default=1,
        min=1,
        max=120
    )

    export_force_sampling: BoolProperty(
        name='Always Sample Animations',
        description='Apply sampling to all animations',
        default=True
    )

    export_sampling_interpolation_fallback: EnumProperty(
        name='Sampling Interpolation Fallback',
        items=(('LINEAR', 'Linear', 'Linear interpolation between keyframes'),
               ('STEP', 'Step', 'No interpolation between keyframes'),
               ),
        description='Interpolation fallback for sampled animations, when the property is not keyed',
        default='LINEAR'
    )

    export_pointer_animation: BoolProperty(
        name='Export Animation Pointer (Experimental)',
        description='Export material, Light & Camera animation as Animation Pointer. '
                    'Available only for baked animation mode \'NLA Tracks\' and \'Scene\'',
        default=False
    )

    export_animation_mode: EnumProperty(
        name='Animation Mode',
        items=(('ACTIONS', 'Actions',
                'Export actions (actives and on NLA tracks) as separate animations'),
               ('ACTIVE_ACTIONS', 'Active actions merged',
                'All the currently assigned actions become one glTF animation'),
               ('BROADCAST', 'Broadcast actions',
                'Broadcast all compatible actions to all objects. '
                'Animated objects will get all actions compatible with them, '
                'others will get no animation at all'),
               ('NLA_TRACKS', 'NLA Tracks',
                'Export individual NLA Tracks as separate animation'),
               ('SCENE', 'Scene',
                'Export baked scene as a single animation')
               ),
        description='Export Animation mode',
        default='ACTIONS'
    )

    export_nla_strips_merged_animation_name: StringProperty(
        name='Merged Animation Name',
        description=(
            "Name of single glTF animation to be exported"
        ),
        default='Animation'
    )

    export_def_bones: BoolProperty(
        name='Export Deformation Bones Only',
        description='Export Deformation bones only',
        default=False
    )

    export_hierarchy_flatten_bones: BoolProperty(
        name='Flatten Bone Hierarchy',
        description='Flatten Bone Hierarchy. Useful in case of non decomposable transformation matrix',
        default=False
    )

    export_hierarchy_flatten_objs: BoolProperty(
        name='Flatten Object Hierarchy',
        description='Flatten Object Hierarchy. Useful in case of non decomposable transformation matrix',
        default=False
    )

    export_armature_object_remove: BoolProperty(
        name='Remove Armature Object',
        description=(
            'Remove Armature object if possible. '
            'If Armature has multiple root bones, object will not be removed'
        ),
        default=False
    )

    export_leaf_bone: BoolProperty(
        name='Add Leaf Bones',
        description=(
            'Append a final bone to the end of each chain to specify last bone length '
            '(use this when you intend to edit the armature from exported data)'
        ),
        default=False
    )

    export_optimize_animation_size: BoolProperty(
        name='Optimize Animation Size',
        description=(
            "Reduce exported file size by removing duplicate keyframes"
        ),
        default=True
    )

    export_optimize_animation_keep_anim_armature: BoolProperty(
        name='Force Keeping Channels for Bones',
        description=(
            "If all keyframes are identical in a rig, "
            "force keeping the minimal animation. "
            "When off, all possible channels for "
            "the bones will be exported, even if empty "
            "(minimal animation, 2 keyframes)"
        ),
        default=True
    )

    export_optimize_animation_keep_anim_object: BoolProperty(
        name='Force Keeping Channel for Objects',
        description=(
            "If all keyframes are identical for object transformations, "
            "force keeping the minimal animation"
        ),
        default=False
    )

    export_optimize_disable_viewport: BoolProperty(
        name='Disable Viewport for Other Objects',
        description=(
            "When exporting animations, disable viewport for other objects, "
            "for performance"
        ),
        default=False
    )

    export_negative_frame: EnumProperty(
        name='Negative Frames',
        items=(('SLIDE', 'Slide',
                'Slide animation to start at frame 0'),
               ('CROP', 'Crop',
                'Keep only frames above frame 0'),
               ),
        description='Negative Frames are slid or cropped',
        default='SLIDE'
    )

    export_anim_slide_to_zero: BoolProperty(
        name='Set All glTF Animation Starting at 0',
        description=(
            "Set all glTF animation starting at 0.0s. "
            "Can be useful for looping animations"
        ),
        default=False
    )

    export_bake_animation: BoolProperty(
        name='Bake All Objects Animations',
        description=(
            "Force exporting animation on every object. "
            "Can be useful when using constraints or driver. "
            "Also useful when exporting only selection"
        ),
        default=False
    )

    export_merge_animation: EnumProperty(
        name='Merge Animation',
        items=(('NLA_TRACK', 'NLA Track Names', 'Merge by NLA Track Names'),
               ('ACTION', 'Actions', 'Merge by Actions'),
               ('NONE', 'No Merge', 'Do Not Merge Animations'),
               ),
        description='Merge Animations',
        default='ACTION'
    )

    export_anim_single_armature: BoolProperty(
        name='Export all Armature Actions',
        description=(
            "Export all actions, bound to a single armature. "
            "WARNING: Option does not support exports including multiple armatures"
        ),
        default=True
    )

    export_reset_pose_bones: BoolProperty(
        name='Reset Pose Bones Between Actions',
        description=(
            "Reset pose bones between each action exported. "
            "This is needed when some bones are not keyed on some animations"
        ),
        default=True
    )

    export_current_frame: BoolProperty(
        name='Use Current Frame as Object Rest Transformations',
        description=(
            'Export the scene in the current animation frame. '
            'When off, frame 0 is used as rest transformations for objects'
        ),
        default=False
    )

    export_rest_position_armature: BoolProperty(
        name='Use Rest Position Armature',
        description=(
            "Export armatures using rest position as joints' rest pose. "
            "When off, current frame pose is used as rest pose"
        ),
        default=True
    )

    export_anim_scene_split_object: BoolProperty(
        name='Split Animation by Object',
        description=(
            "Export Scene as seen in Viewport, "
            "But split animation by Object"
        ),
        default=True
    )

    export_skins: BoolProperty(
        name='Skinning',
        description='Export skinning (armature) data',
        default=True
    )

    export_influence_nb: IntProperty(
        name='Bone Influences',
        description='Choose how many Bone influences to export',
        default=4,
        min=1
    )

    export_all_influences: BoolProperty(
        name='Include All Bone Influences',
        description='Allow export of all joint vertex influences. Models may appear incorrectly in many viewers',
        default=False
    )

    export_morph: BoolProperty(
        name='Shape Keys',
        description='Export shape keys (morph targets)',
        default=True
    )

    export_morph_normal: BoolProperty(
        name='Shape Key Normals',
        description='Export vertex normals with shape keys (morph targets)',
        default=True
    )

    export_morph_tangent: BoolProperty(
        name='Shape Key Tangents',
        description='Export vertex tangents with shape keys (morph targets)',
        default=False
    )

    export_morph_animation: BoolProperty(
        name='Shape Key Animations',
        description='Export shape keys animations (morph targets)',
        default=True
    )

    export_morph_reset_sk_data: BoolProperty(
        name='Reset Shape Keys Between Actions',
        description=(
            "Reset shape keys between each action exported. "
            "This is needed when some SK channels are not keyed on some animations"
        ),
        default=True
    )

    export_lights: BoolProperty(
        name='Punctual Lights',
        description='Export directional, point, and spot lights. '
                    'Uses "KHR_lights_punctual" glTF extension',
        default=False
    )

    export_try_sparse_sk: BoolProperty(
        name='Use Sparse Accessor if Better',
        description='Try using Sparse Accessor if it saves space',
        default=True
    )

    export_try_omit_sparse_sk: BoolProperty(
        name='Omitting Sparse Accessor if Data is Empty',
        description='Omitting Sparse Accessor if data is empty',
        default=False
    )

    export_gpu_instances: BoolProperty(
        name='GPU Instances',
        description='Export using EXT_mesh_gpu_instancing. '
                    'Limited to children of a given Empty. '
                    'Multiple materials might be omitted',
        default=False
    )

    export_action_filter: BoolProperty(
        name='Filter Actions',
        description='Filter Actions to be exported',
        default=False,
        update=on_export_action_filter_changed,
    )

    export_convert_animation_pointer: BoolProperty(
        name='Convert TRS/Weights to Animation Pointer',
        description='Export TRS and weights as Animation Pointer. '
                    'Using KHR_animation_pointer extension',
        default=False
    )

    # This parameter is only here for backward compatibility, as this option is removed in 3.6
    # This option does nothing, and is not displayed in UI
    # What you are looking for is probably "export_animation_mode"
    export_nla_strips: BoolProperty(
        name='Group by NLA Track',
        description=(
            "When on, multiple actions become part of the same glTF animation if "
            "they're pushed onto NLA tracks with the same name. "
            "When off, all the currently assigned actions become one glTF animation"
        ),
        default=True
    )

    # Keep for back compatibility, but no more used
    export_original_specular: BoolProperty(
        name='Export Original PBR Specular',
        description=(
            'Export original glTF PBR Specular, instead of Blender Principled Shader Specular'
        ),
        default=False,
    )

    will_save_settings: BoolProperty(
        name='Remember Export Settings',
        description='Store glTF export settings in the Blender project',
        default=False)

    export_hierarchy_full_collections: BoolProperty(
        name='Full Collection Hierarchy',
        description='Export full hierarchy, including intermediate collections',
        default=False
    )

    export_extra_animations: BoolProperty(
        name='Prepare Extra Animations',
        description=(
            'Export additional animations.\n'
            'This feature is not standard and needs an external extension to be included in the glTF file'
        ),
        default=False
    )

    export_loglevel: IntProperty(
        name='Log Level',
        description="Log Level",
        default=-1,
    )

    # Custom scene property for saving settings
    scene_key = "glTF2ExportSettings"

    #

    def check(self, _context):
        # Ensure file extension matches format
        old_filepath = self.filepath
        self.filepath = ensure_filepath_matches_export_format(
            self.filepath,
            self.export_format,
        )
        return self.filepath != old_filepath

    def invoke(self, context, event):
        settings = context.scene.get(self.scene_key)
        self.will_save_settings = False
        if settings:
            try:
                for (k, v) in settings.items():
                    setattr(self, k, v)
                self.will_save_settings = True

                # Update filter if user saved settings
                if hasattr(self, 'export_format'):
                    self.filter_glob = '*.glb' if self.export_format == 'GLB' else '*.gltf'

            except (AttributeError, TypeError):
                self.report({"ERROR"}, "Loading export settings failed. Removed corrupted settings")
                del context.scene[self.scene_key]

        return ExportHelper.invoke(self, context, event)

    def save_settings(self, context):
        # find all props to save
        exceptional = [
            # options that don't start with 'export_'
            'use_selection',
            'use_visible',
            'use_renderable',
            'use_active_collection_with_nested',
            'use_active_collection',
            'use_mesh_edges',
            'use_mesh_vertices',
            'use_active_scene',
            'collection',
        ]
        all_props = self.properties
        export_props = {
            x: getattr(self, x) for x in dir(all_props)
            if (x.startswith("export_") or x in exceptional) and all_props.get(x) is not None
        }
        context.scene[self.scene_key] = export_props

    def execute(self, context):
        import os
        import datetime
        from .io.exp.user_extensions import export_user_extensions
        from .io.com.debug import Log
        from .blender.exp import export as gltf2_blender_export
        from .io.com.path import path_to_uri

        if self.will_save_settings:
            self.save_settings(context)

        self.check(context)  # ensure filepath has the right extension

        # All custom export settings are stored in this container.
        export_settings = {}

        # Collection Export does not handle correctly props declaration for now
        # So use this tweak to manage it, waiting for a better solution
        is_file_browser = context.space_data and context.space_data.type == 'FILE_BROWSER'
        if not is_file_browser:
            if not hasattr(context.scene, "gltf_action_filter") and self.export_action_filter:
                bpy.types.Scene.gltf_action_filter = bpy.props.CollectionProperty(type=GLTF2_filter_action)
                bpy.types.Scene.gltf_action_filter_active = bpy.props.IntProperty()

        # Get log level from parameters
        # If not set, get it from Blender app debug value
        export_settings['gltf_loglevel'] = self.export_loglevel
        if export_settings['gltf_loglevel'] < 0:
            export_settings['loglevel'] = set_debug_log()

        export_settings['exported_images'] = {}
        export_settings['exported_texture_nodes'] = []
        export_settings['additional_texture_export'] = []
        export_settings['additional_texture_export_current_idx'] = {}

        export_settings['timestamp'] = datetime.datetime.now()
        export_settings['gltf_export_id'] = self.gltf_export_id
        export_settings['gltf_filepath'] = self.filepath
        export_settings['gltf_filedirectory'] = os.path.dirname(export_settings['gltf_filepath']) + '/'
        export_settings['gltf_texturedirectory'] = os.path.join(
            export_settings['gltf_filedirectory'],
            self.export_texture_dir,
        )
        export_settings['gltf_keep_original_textures'] = self.export_keep_originals

        export_settings['gltf_format'] = self.export_format
        export_settings['gltf_image_format'] = self.export_image_format
        export_settings['gltf_add_webp'] = self.export_image_add_webp
        export_settings['gltf_webp_fallback'] = self.export_image_webp_fallback
        export_settings['gltf_image_quality'] = self.export_image_quality
        export_settings['gltf_copyright'] = self.export_copyright
        export_settings['gltf_texcoords'] = self.export_texcoords
        export_settings['gltf_normals'] = self.export_normals
        export_settings['gltf_tangents'] = self.export_tangents and self.export_normals
        export_settings['gltf_loose_edges'] = self.use_mesh_edges
        export_settings['gltf_loose_points'] = self.use_mesh_vertices

        if is_draco_available():
            export_settings['gltf_draco_mesh_compression'] = self.export_draco_mesh_compression_enable
            export_settings['gltf_draco_mesh_compression_level'] = self.export_draco_mesh_compression_level
            export_settings['gltf_draco_position_quantization'] = self.export_draco_position_quantization
            export_settings['gltf_draco_normal_quantization'] = self.export_draco_normal_quantization
            export_settings['gltf_draco_texcoord_quantization'] = self.export_draco_texcoord_quantization
            export_settings['gltf_draco_color_quantization'] = self.export_draco_color_quantization
            export_settings['gltf_draco_generic_quantization'] = self.export_draco_generic_quantization
        else:
            export_settings['gltf_draco_mesh_compression'] = False

        if is_meshopt_available():
            export_settings['gltf_meshopt_compression'] = self.export_meshopt_compression_enable
            export_settings['gltf_meshopt_extension'] = self.export_meshopt_extension
        else:
            export_settings['gltf_meshopt_compression'] = False
            export_settings['gltf_meshopt_extension'] = self.export_meshopt_extension

        export_settings['gltf_gn_mesh'] = self.export_gn_mesh

        export_settings['gltf_materials'] = self.export_materials
        export_settings['gltf_attributes'] = self.export_attributes
        export_settings['gltf_cameras'] = self.export_cameras

        export_settings['gltf_vertex_color'] = self.export_vertex_color
        if self.export_vertex_color == 'NONE':
            export_settings['gltf_all_vertex_colors'] = False
            export_settings['gltf_active_vertex_color_when_no_material'] = False
        else:
            export_settings['gltf_all_vertex_colors'] = self.export_all_vertex_colors
            export_settings['gltf_active_vertex_color_when_no_material'] = self.export_active_vertex_color_when_no_material
        if self.export_vertex_color == 'NAME':
            export_settings['gltf_vertex_color_name'] = self.export_vertex_color_name
        else:
            export_settings['gltf_vertex_color_name'] = ""

        if self.export_materials == "EXPORT":
            export_settings['gltf_unused_textures'] = self.export_unused_textures
            export_settings['gltf_unused_images'] = self.export_unused_images
        else:
            export_settings['gltf_unused_textures'] = False
            export_settings['gltf_unused_images'] = False

        export_settings['gltf_visible'] = self.use_visible
        export_settings['gltf_renderable'] = self.use_renderable

        export_settings['gltf_active_collection'] = self.use_active_collection
        if self.use_active_collection:
            export_settings['gltf_active_collection_with_nested'] = self.use_active_collection_with_nested
        else:
            export_settings['gltf_active_collection_with_nested'] = False
        export_settings['gltf_active_scene'] = self.use_active_scene
        export_settings['gltf_collection'] = self.collection
        export_settings['gltf_at_collection_center'] = self.at_collection_center

        export_settings['gltf_selected'] = self.use_selection
        export_settings['gltf_layers'] = True  # self.export_layers
        export_settings['gltf_extras'] = self.export_extras
        export_settings['gltf_yup'] = self.export_yup
        export_settings['gltf_apply'] = self.export_apply
        export_settings['gltf_shared_accessors'] = self.export_shared_accessors
        export_settings['gltf_current_frame'] = self.export_current_frame
        export_settings['gltf_animations'] = self.export_animations
        export_settings['gltf_def_bones'] = self.export_def_bones
        export_settings['gltf_flatten_bones_hierarchy'] = self.export_hierarchy_flatten_bones
        export_settings['gltf_flatten_obj_hierarchy'] = self.export_hierarchy_flatten_objs
        export_settings['gltf_armature_object_remove'] = self.export_armature_object_remove
        export_settings['gltf_leaf_bone'] = self.export_leaf_bone
        if self.export_animations:
            export_settings['gltf_frame_range'] = self.export_frame_range
            export_settings['gltf_force_sampling'] = self.export_force_sampling
            export_settings['gltf_sampling_interpolation_fallback'] = self.export_sampling_interpolation_fallback
            if not self.export_force_sampling:
                export_settings['gltf_def_bones'] = False
                export_settings['gltf_bake_animation'] = False
            export_settings['gltf_animation_mode'] = self.export_animation_mode
            if export_settings['gltf_animation_mode'] == "NLA_TRACKS":
                export_settings['gltf_force_sampling'] = True
            if export_settings['gltf_animation_mode'] == "SCENE":
                export_settings['gltf_anim_scene_split_object'] = self.export_anim_scene_split_object
            else:
                export_settings['gltf_anim_scene_split_object'] = False

            if export_settings['gltf_animation_mode'] in ['NLA_TRACKS', 'SCENE']:
                export_settings['gltf_export_anim_pointer'] = self.export_pointer_animation
                if self.export_pointer_animation:
                    export_settings['gltf_trs_w_animation_pointer'] = self.export_convert_animation_pointer
                else:
                    export_settings['gltf_trs_w_animation_pointer'] = False
            else:
                export_settings['gltf_trs_w_animation_pointer'] = False
                export_settings['gltf_export_anim_pointer'] = False

            if export_settings['gltf_animation_mode'] != "ACTIONS":
                export_settings['gltf_merge_animation'] = "NLA_TRACK"
            else:
                export_settings['gltf_merge_animation'] = self.export_merge_animation

            if export_settings['gltf_animation_mode'] == "ACTIONS":
                export_settings['gltf_export_anim_single_armature'] = self.export_anim_single_armature
            else:
                export_settings['gltf_export_anim_single_armature'] = False

            export_settings['gltf_nla_strips_merged_animation_name'] = self.export_nla_strips_merged_animation_name
            export_settings['gltf_optimize_animation'] = self.export_optimize_animation_size
            export_settings['gltf_optimize_animation_keep_armature'] = self.export_optimize_animation_keep_anim_armature
            export_settings['gltf_optimize_animation_keep_object'] = self.export_optimize_animation_keep_anim_object
            export_settings['gltf_optimize_disable_viewport'] = self.export_optimize_disable_viewport
            export_settings['gltf_export_reset_pose_bones'] = self.export_reset_pose_bones
            export_settings['gltf_export_reset_sk_data'] = self.export_morph_reset_sk_data
            export_settings['gltf_bake_animation'] = self.export_bake_animation
            export_settings['gltf_negative_frames'] = self.export_negative_frame
            export_settings['gltf_anim_slide_to_zero'] = self.export_anim_slide_to_zero
            export_settings['gltf_export_extra_animations'] = self.export_extra_animations
        else:
            export_settings['gltf_export_anim_pointer'] = False
            export_settings['gltf_trs_w_animation_pointer'] = False
            export_settings['gltf_frame_range'] = False
            export_settings['gltf_force_sampling'] = False
            export_settings['gltf_bake_animation'] = False
            export_settings['gltf_optimize_animation'] = False
            export_settings['gltf_optimize_animation_keep_armature'] = False
            export_settings['gltf_optimize_animation_keep_object'] = False
            export_settings['gltf_optimize_disable_viewport'] = False
            export_settings['gltf_export_anim_single_armature'] = False
            export_settings['gltf_export_reset_pose_bones'] = False
            export_settings['gltf_export_reset_sk_data'] = False
            export_settings['gltf_export_extra_animations'] = False
        export_settings['gltf_skins'] = self.export_skins
        if self.export_skins:
            export_settings['gltf_all_vertex_influences'] = self.export_all_influences
            export_settings['gltf_vertex_influences_nb'] = self.export_influence_nb
        else:
            export_settings['gltf_all_vertex_influences'] = False
            export_settings['gltf_def_bones'] = False
        export_settings['gltf_rest_position_armature'] = self.export_rest_position_armature
        export_settings['gltf_frame_step'] = self.export_frame_step

        export_settings['gltf_morph'] = self.export_morph
        if self.export_morph:
            export_settings['gltf_morph_normal'] = self.export_morph_normal
            export_settings['gltf_morph_tangent'] = self.export_morph_tangent
            export_settings['gltf_morph_anim'] = self.export_morph_animation
        else:
            export_settings['gltf_morph_normal'] = False
            export_settings['gltf_morph_tangent'] = False
            export_settings['gltf_morph_anim'] = False

        export_settings['gltf_lights'] = self.export_lights
        export_settings['gltf_lighting_mode'] = self.export_import_convert_lighting_mode

        export_settings['gltf_gpu_instances'] = self.export_gpu_instances

        export_settings['gltf_try_sparse_sk'] = self.export_try_sparse_sk
        export_settings['gltf_try_omit_sparse_sk'] = self.export_try_omit_sparse_sk
        if not self.export_try_sparse_sk:
            export_settings['gltf_try_omit_sparse_sk'] = False

        export_settings['gltf_hierarchy_full_collections'] = self.export_hierarchy_full_collections

        # gltfpack stuff
        export_settings['gltf_use_gltfpack'] = self.export_use_gltfpack
        if self.export_use_gltfpack:
            export_settings['gltf_gltfpack_tc'] = self.export_gltfpack_tc
            export_settings['gltf_gltfpack_tq'] = self.export_gltfpack_tq

            export_settings['gltf_gltfpack_si'] = self.export_gltfpack_si
            export_settings['gltf_gltfpack_sa'] = self.export_gltfpack_sa
            export_settings['gltf_gltfpack_slb'] = self.export_gltfpack_slb

            export_settings['gltf_gltfpack_vp'] = self.export_gltfpack_vp
            export_settings['gltf_gltfpack_vt'] = self.export_gltfpack_vt
            export_settings['gltf_gltfpack_vn'] = self.export_gltfpack_vn
            export_settings['gltf_gltfpack_vc'] = self.export_gltfpack_vc

            export_settings['gltf_gltfpack_vpi'] = self.export_gltfpack_vpi

            export_settings['gltf_gltfpack_noq'] = self.export_gltfpack_noq
            export_settings['gltf_gltfpack_kn'] = self.export_gltfpack_kn

        export_settings['gltf_binary'] = bytearray()
        export_settings['gltf_binaryfilename'] = (
            path_to_uri(os.path.splitext(os.path.basename(self.filepath))[0] + '.bin')
        )

        export_settings['warning_joint_weight_exceed_already_displayed'] = False

        export_settings['image_names'] = []

        user_extensions = []
        pre_export_callbacks = []
        post_export_callbacks = []

        import sys
        preferences = bpy.context.preferences
        for addon_name in preferences.addons.keys():
            try:
                module = sys.modules[addon_name]
            except Exception:
                continue
            if hasattr(module, 'glTF2ExportUserExtension'):
                extension_ctor = module.glTF2ExportUserExtension
                user_extensions.append(extension_ctor())
            if hasattr(module, 'glTF2ExportUserExtensions'):
                extension_ctors = module.glTF2ExportUserExtensions
                for extension_ctor in extension_ctors:
                    user_extensions.append(extension_ctor())
            if hasattr(module, 'glTF2_pre_export_callback'):
                pre_export_callbacks.append(module.glTF2_pre_export_callback)
            if hasattr(module, 'glTF2_post_export_callback'):
                post_export_callbacks.append(module.glTF2_post_export_callback)
        export_settings['gltf_user_extensions'] = user_extensions
        export_settings['pre_export_callbacks'] = pre_export_callbacks
        export_settings['post_export_callbacks'] = post_export_callbacks

        # Initialize logging for export
        export_settings['log'] = Log(export_settings['loglevel'])

        # Pre-export hook
        export_user_extensions('pre_export_hook', export_settings)

        profile = bpy.app.debug_value == 102
        if profile:
            import cProfile
            import pstats
            import io
            from pstats import SortKey
            pr = cProfile.Profile()
            pr.enable()
            res = gltf2_blender_export.save(context, export_settings)
            pr.disable()
            s = io.StringIO()
            sortby = SortKey.TIME
            ps = pstats.Stats(pr, stream=s).sort_stats(sortby)
            ps.print_stats()
            print(s.getvalue())
        else:
            res = gltf2_blender_export.save(context, export_settings)

        # Display popup log, if any
        for message_type, message in export_settings['log'].messages():
            self.report({message_type}, message)

        export_settings['log'].flush()

        # Post-export hook
        export_user_extensions('post_export_hook', export_settings)

        return res

    def draw(self, context):
        operator = self
        layout = self.layout
        layout.use_property_split = True
        layout.use_property_decorate = False  # No animation.

        # Are we inside the File browser
        is_file_browser = context.space_data.type == 'FILE_BROWSER'

        export_main(layout, operator, is_file_browser)
        export_panel_collection(layout, operator, is_file_browser)
        export_panel_include(layout, operator, is_file_browser)
        export_panel_transform(layout, operator)
        export_panel_data(layout, operator)
        export_panel_animation(layout, operator)

        # If gltfpack is not setup in plugin preferences -> don't show any gltfpack relevant options in export dialog
        gltfpack_path = context.preferences.addons['io_scene_gltf2'].preferences.gltfpack_path_ui.strip()
        if gltfpack_path != '':
            export_panel_gltfpack(layout, operator)

        export_panel_user_extension(context, layout)


def export_main(layout, operator, is_file_browser):
    layout.prop(operator, 'export_format')
    if operator.export_format == 'GLTF_SEPARATE':
        layout.prop(operator, 'export_keep_originals')
        if operator.export_keep_originals is False:
            layout.prop(operator, 'export_texture_dir', icon='FILE_FOLDER')
    if operator.export_format == 'GLTF_EMBEDDED':
        layout.label(
            text="This is the least efficient of the available forms, and should only be used when required.",
            icon='ERROR')

    layout.prop(operator, 'export_copyright')
    if is_file_browser:
        layout.prop(operator, 'will_save_settings')


def export_panel_collection(layout, operator, is_file_browser):
    if is_file_browser:
        return

    header, body = layout.panel("GLTF_export_collection", default_closed=True)
    header.label(text="Collection")
    if body:
        body.prop(operator, 'at_collection_center')


def export_panel_include(layout, operator, is_file_browser):
    header, body = layout.panel("GLTF_export_include", default_closed=True)
    header.label(text="Include")
    if body:
        if is_file_browser:
            col = body.column(heading="Limit to", align=True)
            col.prop(operator, 'use_selection')
            col.prop(operator, 'use_visible')
            col.prop(operator, 'use_renderable')
            col.prop(operator, 'use_active_collection')
            if operator.use_active_collection:
                col.prop(operator, 'use_active_collection_with_nested')
            col.prop(operator, 'use_active_scene')

        col = body.column(heading="Data", align=True)
        col.prop(operator, 'export_extras')
        col.prop(operator, 'export_cameras')
        col.prop(operator, 'export_lights')


def export_panel_transform(layout, operator):
    header, body = layout.panel("GLTF_export_transform", default_closed=True)
    header.label(text="Transform")
    if body:
        body.prop(operator, 'export_yup')


def export_panel_data(layout, operator):
    header, body = layout.panel("GLTF_export_data", default_closed=True)
    header.label(text="Data")
    if body:
        export_panel_data_scene_graph(body, operator)
        export_panel_data_mesh(body, operator)
        export_panel_data_material(body, operator)
        export_panel_data_shapekeys(body, operator)
        export_panel_data_armature(body, operator)
        export_panel_data_skinning(body, operator)
        export_panel_data_lighting(body, operator)

        if is_draco_available():
            export_panel_data_compression(body, operator)
        if is_meshopt_available():
            export_panel_data_meshopt_compression(body, operator)


def export_panel_data_scene_graph(layout, operator):
    header, body = layout.panel("GLTF_export_data_scene_graph", default_closed=True)
    header.label(text="Scene Graph")
    if body:
        body.prop(operator, 'export_gn_mesh')
        body.prop(operator, 'export_gpu_instances')
        body.prop(operator, 'export_hierarchy_flatten_objs')
        body.prop(operator, 'export_hierarchy_full_collections')


def export_panel_data_mesh(layout, operator):
    header, body = layout.panel("GLTF_export_data_mesh", default_closed=True)
    header.label(text="Mesh")
    if body:
        body.prop(operator, 'export_apply')
        body.prop(operator, 'export_texcoords')
        body.prop(operator, 'export_normals')
        col = body.column()
        col.active = operator.export_normals
        col.prop(operator, 'export_tangents')
        body.prop(operator, 'export_attributes')

        col = body.column()
        col.prop(operator, 'use_mesh_edges')
        col.prop(operator, 'use_mesh_vertices')

        col = body.column()
        col.prop(operator, 'export_shared_accessors')

        header, sub_body = body.panel("GLTF_export_data_material_vertex_color", default_closed=True)
        header.label(text="Vertex Colors")
        if sub_body:
            row = sub_body.row()
            row.prop(operator, 'export_vertex_color')
            row = sub_body.row()
            if operator.export_vertex_color == "NAME":
                row.prop(operator, 'export_vertex_color_name')
            if operator.export_vertex_color in ["ACTIVE", "NAME"]:
                row = sub_body.row()
                row.label(
                    text="Note that fully compliant glTF 2.0 engine/viewer will use it as multiplicative factor for base color.",
                    icon='ERROR')
                row = sub_body.row()
                row.label(text="If you want to use VC for any other purpose than vertex color, you should use custom attributes.")
            row = sub_body.row()
            row.active = operator.export_vertex_color != "NONE"
            row.prop(operator, 'export_all_vertex_colors')
            row = sub_body.row()
            row.active = operator.export_vertex_color != "NONE"
            row.prop(operator, 'export_active_vertex_color_when_no_material')


def export_panel_data_material(layout, operator):
    header, body = layout.panel("GLTF_export_data_material", default_closed=True)
    header.label(text="Material")
    if body:
        body.prop(operator, 'export_materials')
        col = body.column()
        col.active = operator.export_materials == "EXPORT"
        col.prop(operator, 'export_image_format')
        if operator.export_image_format in ["AUTO", "JPEG", "WEBP"]:
            col.prop(operator, 'export_image_quality')
        col = body.column()
        col.active = operator.export_image_format != "WEBP" and operator.export_materials not in [
            'PLACEHOLDER', 'NONE', 'VIEWPORT']
        col.prop(operator, "export_image_add_webp")
        col = body.column()
        col.active = operator.export_image_format != "WEBP" and operator.export_materials not in [
            'PLACEHOLDER', 'NONE', 'VIEWPORT']
        col.prop(operator, "export_image_webp_fallback")

        header, sub_body = body.panel("GLTF_export_data_material_unused", default_closed=True)
        header.label(text="Unused Textures & Images")
        header.active = operator.export_materials == "EXPORT"
        if sub_body:
            sub_body.active = operator.export_materials == "EXPORT"
            row = sub_body.row()
            row.prop(operator, 'export_unused_images')
            row = sub_body.row()
            row.prop(operator, 'export_unused_textures')


def export_panel_data_shapekeys(layout, operator):
    header, body = layout.panel("GLTF_export_data_shapekeys", default_closed=True)
    header.use_property_split = False
    header.prop(operator, "export_morph", text="")
    header.label(text="Shape Keys")
    if body:
        body.active = operator.export_morph

        body.prop(operator, 'export_morph_normal')
        col = body.column()
        col.active = operator.export_morph_normal
        col.prop(operator, 'export_morph_tangent')

        # Data-Shape Keys-Optimize
        header, sub_body = body.panel("GLTF_export_data_shapekeys_optimize", default_closed=True)
        header.label(text="Optimize Shape Keys")
        if sub_body:
            row = sub_body.row()
            row.prop(operator, 'export_try_sparse_sk')

            row = sub_body.row()
            row.active = operator.export_try_sparse_sk
            row.prop(operator, 'export_try_omit_sparse_sk')


def export_panel_data_armature(layout, operator):
    header, body = layout.panel("GLTF_export_data_armature", default_closed=True)
    header.label(text="Armature")
    if body:
        body.active = operator.export_skins

        body.prop(operator, 'export_rest_position_armature')

        row = body.row()
        row.active = operator.export_force_sampling
        row.prop(operator, 'export_def_bones')
        if operator.export_force_sampling is False and operator.export_def_bones is True:
            body.label(text="Export only deformation bones is not possible when not sampling animation")
        row = body.row()
        row.prop(operator, 'export_armature_object_remove')
        row = body.row()
        row.prop(operator, 'export_hierarchy_flatten_bones')
        row = body.row()
        row.prop(operator, 'export_leaf_bone')


def export_panel_data_skinning(layout, operator):
    header, body = layout.panel("GLTF_export_data_skinning", default_closed=True)
    header.use_property_split = False
    header.prop(operator, "export_skins", text="")
    header.label(text="Skinning")
    if body:
        body.active = operator.export_skins

        row = body.row()
        row.prop(operator, 'export_influence_nb')
        row.active = not operator.export_all_influences
        body.prop(operator, 'export_all_influences')


def export_panel_data_lighting(layout, operator):
    header, body = layout.panel("GLTF_export_data_lighting", default_closed=True)
    header.label(text="Lighting")
    if body:
        body.prop(operator, 'export_import_convert_lighting_mode')


def export_panel_data_compression(layout, operator):
    header, body = layout.panel("GLTF_export_data_compression", default_closed=True)
    header.use_property_split = False
    header.prop(operator, "export_draco_mesh_compression_enable", text="")
    header.label(text="Draco Compression")
    if body:
        body.active = operator.export_draco_mesh_compression_enable

        body.prop(operator, 'export_draco_mesh_compression_level')

        col = body.column(align=True)
        col.prop(operator, 'export_draco_position_quantization', text="Quantize Position")
        col.prop(operator, 'export_draco_normal_quantization', text="Normal")
        col.prop(operator, 'export_draco_texcoord_quantization', text="Tex Coord")
        col.prop(operator, 'export_draco_color_quantization', text="Color")
        col.prop(operator, 'export_draco_generic_quantization', text="Generic")

# TODO: Make sure we can't enable both Draco and Meshopt at the same time


def export_panel_data_meshopt_compression(layout, operator):
    header, body = layout.panel("GLTF_export_data_meshopt_compression", default_closed=True)
    header.use_property_split = False
    header.prop(operator, "export_meshopt_compression_enable", text="")
    header.label(text="Meshopt Compression")
    if body:
        body.active = operator.export_meshopt_compression_enable
        body.prop(operator, 'export_meshopt_extension')


def export_panel_animation(layout, operator):
    header, body = layout.panel("GLTF_export_animation", default_closed=True)
    header.use_property_split = False
    header.prop(operator, "export_animations", text="")
    header.label(text="Animation")
    if body:
        body.active = operator.export_animations

        body.prop(operator, 'export_animation_mode')
        if operator.export_animation_mode == "ACTIVE_ACTIONS":
            layout.prop(operator, 'export_nla_strips_merged_animation_name')

        if operator.export_animation_mode in ["NLA_TRACKS", "SCENE"]:
            export_panel_animation_notes(body, operator)
        export_panel_animation_bake_and_merge(body, operator)
        export_panel_animation_ranges(body, operator)
        export_panel_animation_armature(body, operator)
        export_panel_animation_shapekeys(body, operator)
        export_panel_animation_sampling(body, operator)
        export_panel_animation_pointer(body, operator)
        export_panel_animation_optimize(body, operator)
        if operator.export_animation_mode in ['ACTIONS', 'ACTIVE_ACTIONS']:
            export_panel_animation_extra(body, operator)

        from .blender.com.gltf2_blender_ui import export_panel_animation_action_filter
        export_panel_animation_action_filter(body, operator)


def export_panel_animation_notes(layout, operator):
    header, body = layout.panel("GLTF_export_animation_notes", default_closed=True)
    header.label(text="Notes")
    if body:
        if operator.export_animation_mode == "SCENE":
            body.label(text="Scene mode uses full bake mode:")
            body.label(text="- sampling is active")
            body.label(text="- baking all objects is active")
            body.label(text="- Using scene frame range")
        elif operator.export_animation_mode == "NLA_TRACKS":
            body.label(text="Track mode uses full bake mode:")
            body.label(text="- sampling is active")
            body.label(text="- baking all objects is active")


def export_panel_animation_bake_and_merge(layout, operator):
    header, body = layout.panel("GLTF_export_animation_bake_and_merge", default_closed=False)
    header.label(text="Bake & Merge")
    if body:
        body.active = operator.export_animations

        row = body.row()
        row.active = operator.export_force_sampling and operator.export_animation_mode in [
            'ACTIONS', 'ACTIVE_ACTIONS', 'BROACAST']
        row.prop(operator, 'export_bake_animation')

        if operator.export_animation_mode == "SCENE":
            row = body.row()
            row.prop(operator, 'export_anim_scene_split_object')

        row = body.row()
        row.active = operator.export_force_sampling and operator.export_animation_mode in ['ACTIONS']
        row.prop(operator, 'export_merge_animation')

        row = body.row()


def export_panel_animation_ranges(layout, operator):
    header, body = layout.panel("GLTF_export_animation_ranges", default_closed=True)
    header.label(text="Rest & Ranges")
    if body:
        body.active = operator.export_animations

        body.prop(operator, 'export_current_frame')
        row = body.row()
        row.active = operator.export_animation_mode in ['ACTIONS', 'ACTIVE_ACTIONS', 'BROADCAST', 'NLA_TRACKS']
        row.prop(operator, 'export_frame_range')
        body.prop(operator, 'export_anim_slide_to_zero')
        row = body.row()
        row.active = operator.export_animation_mode in ['ACTIONS', 'ACTIVE_ACTIONS', 'BROADCAST', 'NLA_TRACKS']
        body.prop(operator, 'export_negative_frame')


def export_panel_animation_armature(layout, operator):
    header, body = layout.panel("GLTF_export_animation_armature", default_closed=True)
    header.label(text="Armature")
    if body:
        body.active = operator.export_animations

        row = body.row()
        row.active = operator.export_animation_mode == "ACTIONS"
        row.prop(operator, 'export_anim_single_armature')
        row = body.row()
        row.prop(operator, 'export_reset_pose_bones')


def export_panel_animation_shapekeys(layout, operator):
    header, body = layout.panel("GLTF_export_animation_shapekeys", default_closed=True)
    header.active = operator.export_animations and operator.export_morph
    header.use_property_split = False
    header.prop(operator, "export_morph_animation", text="")
    header.label(text="Shape Keys Animation")
    if body:
        body.active = operator.export_animations and operator.export_morph

        row = body.row()
        row.active = operator.export_morph_animation
        row.prop(operator, 'export_morph_reset_sk_data')


def export_panel_animation_sampling(layout, operator):
    header, body = layout.panel("GLTF_export_animation_sampling", default_closed=True)
    header.use_property_split = False
    header.prop(operator, "export_force_sampling", text="")
    header.label(text="Sampling Animations")
    if body:
        body.active = operator.export_animations and operator.export_force_sampling

        body.prop(operator, 'export_frame_step')
        body.prop(operator, 'export_sampling_interpolation_fallback')


def export_panel_animation_pointer(layout, operator):
    header, body = layout.panel("GLTF_export_animation_pointer", default_closed=True)
    header.use_property_split = False
    header.active = operator.export_animations and operator.export_animation_mode in ['NLA_TRACKS', 'SCENE']
    header.prop(operator, "export_pointer_animation", text="")
    header.label(text="Animation Pointer (Experimental)")
    if body:
        row = body.row()
        row.active = header.active and operator.export_pointer_animation
        row.prop(operator, 'export_convert_animation_pointer')


def export_panel_animation_optimize(layout, operator):
    header, body = layout.panel("GLTF_export_animation_optimize", default_closed=True)
    header.label(text="Optimize Animations")
    if body:
        body.active = operator.export_animations

        body.prop(operator, 'export_optimize_animation_size')

        row = body.row()
        row.prop(operator, 'export_optimize_animation_keep_anim_armature')

        row = body.row()
        row.prop(operator, 'export_optimize_animation_keep_anim_object')

        row = body.row()
        row.prop(operator, 'export_optimize_disable_viewport')


def export_panel_animation_extra(layout, operator):
    header, body = layout.panel("GLTF_export_animation_extra", default_closed=True)
    header.label(text="Extra Animations")
    if body:
        body.active = operator.export_animations

        body.prop(operator, 'export_extra_animations')


def export_panel_gltfpack(layout, operator):
    header, body = layout.panel("GLTF_export_gltfpack", default_closed=True)
    header.label(text="gltfpack")
    if body:
        col = body.column(heading="gltfpack", align=True)
        col.prop(operator, 'export_use_gltfpack')

        col = body.column(heading="Textures", align=True)
        col.prop(operator, 'export_gltfpack_tc')
        col.prop(operator, 'export_gltfpack_tq')
        col = body.column(heading="Simplification", align=True)
        col.prop(operator, 'export_gltfpack_si')
        col.prop(operator, 'export_gltfpack_sa')
        col.prop(operator, 'export_gltfpack_slb')
        col = body.column(heading="Vertices", align=True)
        col.prop(operator, 'export_gltfpack_vp')
        col.prop(operator, 'export_gltfpack_vt')
        col.prop(operator, 'export_gltfpack_vn')
        col.prop(operator, 'export_gltfpack_vc')
        col = body.column(heading="Vertex positions", align=True)
        col.prop(operator, 'export_gltfpack_vpi')
        # col = body.column(heading = "Animations", align = True)
        # col = body.column(heading = "Scene", align = True)
        col = body.column(heading="Miscellaneous", align=True)
        col.prop(operator, 'export_gltfpack_noq')
        col.prop(operator, 'export_gltfpack_kn')


def export_panel_user_extension(context, layout):
    for draw in exporter_extension_layout_draw.values():
        draw(context, layout)


class ExportGLTF2(bpy.types.Operator, ExportGLTF2_Base, ExportHelper):
    """Export scene as glTF 2.0 file"""
    bl_idname = 'export_scene.gltf'
    bl_label = 'Export glTF 2.0'

    filename_ext = ''

    filter_glob: StringProperty(default='*.glb', options={'HIDDEN'})


def menu_func_export(self, context):
    self.layout.operator(ExportGLTF2.bl_idname, text='glTF 2.0 (.glb/.gltf)')


class ImportGLTF2(Operator, ConvertGLTF2_Base, ImportHelper):
    """Load a glTF 2.0 file"""
    bl_idname = 'import_scene.gltf'
    bl_label = 'Import glTF 2.0'
    bl_options = {'REGISTER', 'UNDO'}

    filter_glob: StringProperty(default="*.glb;*.gltf", options={'HIDDEN'})

    directory: StringProperty(
        subtype='DIR_PATH',
        options={'HIDDEN', 'SKIP_PRESET'},
    )

    files: CollectionProperty(
        name="File Path",
        type=bpy.types.OperatorFileListElement,
    )

    loglevel: IntProperty(
        name='Log Level',
        description="Log Level")

    import_pack_images: BoolProperty(
        name='Pack Images',
        description='Pack all images into .blend file',
        default=True
    )

    merge_vertices: BoolProperty(
        name='Merge Vertices',
        description=(
            'The glTF format requires discontinuous normals, UVs, and '
            'other vertex attributes to be stored as separate vertices, '
            'as required for rendering on typical graphics hardware. '
            'This option attempts to combine co-located vertices where possible. '
            'Currently cannot combine verts with different normals'
        ),
        default=False,
    )

    import_shading: EnumProperty(
        name="Shading",
        items=(("NORMALS", "Use Normal Data", ""),
               ("FLAT", "Flat Shading", ""),
               ("SMOOTH", "Smooth Shading", "")),
        description="How normals are computed during import",
        default="NORMALS")

    bone_heuristic: EnumProperty(
        name="Bone Dir",
        items=(
            ("BLENDER", "Blender (best for import/export round trip)",
                "Good for re-importing glTFs exported from Blender, "
                "and re-exporting glTFs to glTFs after Blender editing. "
                "Bone tips are placed on their local +Y axis (in glTF space)"),
            ("TEMPERANCE", "Temperance (average)",
                "Decent all-around strategy. "
                "A bone with one child has its tip placed on the local axis "
                "closest to its child"),
            ("FORTUNE", "Fortune (may look better, less accurate)",
                "Might look better than Temperance, but also might have errors. "
                "A bone with one child has its tip placed at its child's root. "
                "Non-uniform scalings may get messed up though, so beware"),
        ),
        description="Heuristic for placing bones. Tries to make bones pretty",
        default="BLENDER",
    )

    disable_bone_shape: BoolProperty(
        name='Disable Bone Shape',
        description='Do not create bone shapes',
        default=False,
    )

    bone_shape_scale_factor: FloatProperty(
        name='Bone Shape Scale',
        description='Scale factor for bone shapes',
        default=1.0,
    )

    guess_original_bind_pose: BoolProperty(
        name='Guess Original Bind Pose',
        description=(
            'Try to guess the original bind pose for skinned meshes from '
            'the inverse bind matrices. '
            'When off, use default/rest pose as bind pose'
        ),
        default=True,
    )

    import_webp_texture: BoolProperty(
        name='Import WebP Textures',
        description=(
            "If a texture exists in WebP format, "
            "loads the WebP texture instead of the fallback PNG/JPEG one"
        ),
        default=False,
    )

    import_unused_materials: BoolProperty(
        name='Import Unused Materials & Images',
        description='Import materials & Images not assigned to any mesh',
        default=False,
    )

    import_select_created_objects: BoolProperty(
        name='Select Imported Objects',
        description='Select created objects at the end of the import',
        default=True,
    )

    import_scene_extras: BoolProperty(
        name='Import Scene Extras',
        description='Import scene extras as custom properties. '
                    'Existing custom properties will be overwritten',
        default=True,
    )

    import_scene_as_collection: BoolProperty(
        name='Import Scene as Collection',
        description='Import the scene as a collection',
        default=True,
    )

    import_merge_material_slots: BoolProperty(
        name='Merge Material Slot when possible',
        description='Merge material slots when possible',
        default=True,
    )

    import_point_as_pointcloud: BoolProperty(
        name='Import Points as Point Cloud',
        description='Import mesh with only POINTS primitives as Point Cloud objects',
        default=False,
    )

    def draw(self, context):
        operator = self
        layout = self.layout

        layout.use_property_split = True
        layout.use_property_decorate = False  # No animation.

        layout.prop(self, 'import_shading')
        layout.prop(self, 'export_import_convert_lighting_mode')
        import_mesh_panel(layout, operator)
        import_texture_panel(layout, operator)
        import_bone_panel(layout, operator)
        import_ux_panel(layout, operator)

        import_panel_user_extension(context, layout)

    def invoke(self, context, event):
        import sys
        preferences = bpy.context.preferences
        for addon_name in preferences.addons.keys():
            try:
                if hasattr(
                        sys.modules[addon_name],
                        'glTF2ImportUserExtension') or hasattr(
                        sys.modules[addon_name],
                        'glTF2ImportUserExtensions'):
                    importer_extension_layout_draw[addon_name] = sys.modules[addon_name].draw_import if hasattr(
                        sys.modules[addon_name], 'draw_import') else sys.modules[addon_name].draw
            except Exception:
                pass

        self.has_active_importer_extensions = len(importer_extension_layout_draw.keys()) > 0
        return ImportHelper.invoke_popup(self, context)

    def execute(self, context):
        return self.import_gltf2(context)

    def import_gltf2(self, context):
        import os

        self.loglevel = set_debug_log()
        import_settings = self.as_keywords()

        user_extensions = []

        import sys
        preferences = bpy.context.preferences
        for addon_name in preferences.addons.keys():
            try:
                module = sys.modules[addon_name]
            except Exception:
                continue
            if hasattr(module, 'glTF2ImportUserExtension'):
                extension_ctor = module.glTF2ImportUserExtension
                user_extensions.append(extension_ctor())
        import_settings['import_user_extensions'] = user_extensions

        if self.files:
            # Multiple file import
            ret = {'CANCELLED'}
            for file in self.files:
                path = os.path.join(self.directory, file.name)
                if self.unit_import(path, import_settings) == {'FINISHED'}:
                    ret = {'FINISHED'}
            return ret
        else:
            # Single file import
            return self.unit_import(self.filepath, import_settings)

    def unit_import(self, filename, import_settings):
        import time
        from .io.imp.gltf2_io_gltf import glTFImporter, ImportError
        from .blender.imp.blender_gltf import BlenderGlTF

        try:
            gltf_importer = glTFImporter(filename, import_settings)
            gltf_importer.read()
            gltf_importer.checks()

            gltf_importer.log.info("Data are loaded, start creating Blender stuff")

            start_time = time.time()
            BlenderGlTF.create(gltf_importer)
            elapsed_s = "{:.2f}s".format(time.time() - start_time)
            gltf_importer.log.info("glTF import finished in " + elapsed_s)

            # Display popup log, if any
            for message_type, message in gltf_importer.log.messages():
                self.report({message_type}, message)

            gltf_importer.log.flush()

            return {'FINISHED'}

        except ImportError as e:
            self.report({'ERROR'}, e.args[0])
            return {'CANCELLED'}


def import_mesh_panel(layout, operator):
    header, body = layout.panel("GLTF_import_mesh", default_closed=False)
    header.label(text="Mesh")
    if body:
        body.prop(operator, 'merge_vertices')
        body.prop(operator, 'import_merge_material_slots')
        body.prop(operator, 'import_point_as_pointcloud')


def import_bone_panel(layout, operator):
    header, body = layout.panel("GLTF_import_bone", default_closed=False)
    header.label(text="Bones & Skin")
    if body:
        body.prop(operator, 'bone_heuristic')
        if operator.bone_heuristic == 'BLENDER':
            body.prop(operator, 'guess_original_bind_pose')
            body.prop(operator, 'disable_bone_shape')
            body.prop(operator, 'bone_shape_scale_factor')


def import_ux_panel(layout, operator):
    header, body = layout.panel("GLTF_import_ux", default_closed=False)
    header.label(text="Pipeline")
    if body:
        body.prop(operator, 'import_scene_as_collection')
        if operator.import_scene_as_collection is True:
            body.prop(operator, 'import_select_created_objects')
        body.prop(operator, 'import_scene_extras')


def import_texture_panel(layout, operator):
    header, body = layout.panel("GLTF_import_texture", default_closed=False)
    header.label(text="Texture")
    if body:
        body.prop(operator, 'import_pack_images')
        body.prop(operator, 'import_webp_texture')
        body.prop(operator, 'import_unused_materials')


def import_panel_user_extension(context, layout):
    for draw in importer_extension_layout_draw.values():
        draw(context, layout)


class GLTF2_filter_action(bpy.types.PropertyGroup):
    __slots__ = ()

    keep: bpy.props.BoolProperty(name="Keep Animation")
    action: bpy.props.PointerProperty(type=bpy.types.Action)


def gltf_variant_ui_update(self, context):
    from .blender.com.gltf2_blender_ui import variant_register, variant_unregister
    if self.KHR_materials_variants_ui is True:
        # register all needed types
        variant_register()
    else:
        variant_unregister()


def gltf_animation_ui_update(self, context):
    from .blender.com.gltf2_blender_ui import anim_ui_register, anim_ui_unregister
    if self.animation_ui is True:
        # register all needed types
        anim_ui_register()
    else:
        anim_ui_unregister()


class GLTF_AddonPreferences(bpy.types.AddonPreferences):
    bl_idname = __package__

    settings_node_ui: bpy.props.BoolProperty(
        default=False,
        description="Displays glTF Material Output node in Shader Editor (Menu Add > Output)"
    )

    KHR_materials_variants_ui: bpy.props.BoolProperty(
        default=False,
        description="Displays glTF UI to manage material variants",
        update=gltf_variant_ui_update
    )

    animation_ui: bpy.props.BoolProperty(
        default=False,
        description="Display glTF UI to manage animations",
        update=gltf_animation_ui_update
    )

    gltfpack_path_ui: bpy.props.StringProperty(
        default="",
        name="glTFpack file path",
        description="Path to gltfpack binary",
        subtype='FILE_PATH'
    )

    allow_embedded_format: bpy.props.BoolProperty(
        default=False,
        name='Allow glTF Embedded format',
        description="Allow glTF Embedded format"
    )

    def draw(self, context):
        layout = self.layout
        row = layout.row()
        row.prop(self, "settings_node_ui", text="Shader Editor Add-ons")
        row.prop(self, "KHR_materials_variants_ui", text="Material Variants")
        row.prop(self, "animation_ui", text="Animation UI")
        row = layout.row()
        row.prop(self, "gltfpack_path_ui", text="Path to gltfpack")
        row = layout.row()
        row.prop(self, "allow_embedded_format", text="Allow glTF Embedded format")
        if self.allow_embedded_format:
            layout.label(
                text="This is the least efficient of the available forms, and should only be used when required.",
                icon='ERROR')


class IO_FH_gltf2(bpy.types.FileHandler):
    bl_idname = "IO_FH_gltf2"
    bl_label = "glTF 2.0"
    bl_import_operator = "import_scene.gltf"
    bl_export_operator = "export_scene.gltf"
    bl_file_extensions = ".glb;.gltf"

    @classmethod
    def poll_drop(cls, context):
        return poll_file_object_drop(context)


def menu_func_import(self, context):
    self.layout.operator(ImportGLTF2.bl_idname, text='glTF 2.0 (.glb/.gltf)')


classes = (
    ExportGLTF2,
    ImportGLTF2,
    IO_FH_gltf2,
    GLTF2_filter_action,
    GLTF_AddonPreferences
)


def register():
    from .blender.com import gltf2_blender_ui as blender_ui

    for c in classes:
        bpy.utils.register_class(c)
    # bpy.utils.register_module(__name__)

    blender_ui.register()
    if bpy.context.preferences.addons['io_scene_gltf2'].preferences.KHR_materials_variants_ui is True:
        blender_ui.variant_register()
    if bpy.context.preferences.addons['io_scene_gltf2'].preferences.animation_ui is True:
        blender_ui.anim_ui_register()

    # add to the export / import menu
    bpy.types.TOPBAR_MT_file_export.append(menu_func_export)
    bpy.types.TOPBAR_MT_file_import.append(menu_func_import)


def unregister():
    from .blender.com import gltf2_blender_ui as blender_ui
    blender_ui.unregister()
    if bpy.context.preferences.addons['io_scene_gltf2'].preferences.KHR_materials_variants_ui is True:
        blender_ui.variant_unregister()
    if bpy.context.preferences.addons['io_scene_gltf2'].preferences.animation_ui is True:
        blender_ui.anim_ui_unregister()

    for c in classes:
        bpy.utils.unregister_class(c)

    # bpy.utils.unregister_module(__name__)

    # remove from the export / import menu
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
    bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)
