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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2022 The glTF-Blender-IO authors.
import bpy
from io_scene_gltf2.io.com.gltf2_io_extensions import Extension
from io_scene_gltf2.blender.exp import gltf2_blender_get
from io_scene_gltf2.blender.exp import gltf2_blender_gather_texture_info
def export_clearcoat(blender_material, export_settings):
clearcoat_enabled = False
has_clearcoat_texture = False
has_clearcoat_roughness_texture = False
clearcoat_extension = {}
clearcoat_roughness_slots = ()
clearcoat_socket = gltf2_blender_get.get_socket(blender_material, 'Clearcoat')
clearcoat_roughness_socket = gltf2_blender_get.get_socket(blender_material, 'Clearcoat Roughness')
clearcoat_normal_socket = gltf2_blender_get.get_socket(blender_material, 'Clearcoat Normal')
if isinstance(clearcoat_socket, bpy.types.NodeSocket) and not clearcoat_socket.is_linked:
clearcoat_extension['clearcoatFactor'] = clearcoat_socket.default_value
clearcoat_enabled = clearcoat_extension['clearcoatFactor'] > 0
elif gltf2_blender_get.has_image_node_from_socket(clearcoat_socket):
fac = gltf2_blender_get.get_factor_from_socket(clearcoat_socket, kind='VALUE')
# default value in glTF is 0.0, but if there is a texture without factor, use 1
clearcoat_extension['clearcoatFactor'] = fac if fac != None else 1.0
has_clearcoat_texture = True
clearcoat_enabled = True
if not clearcoat_enabled:
return None, None
if isinstance(clearcoat_roughness_socket, bpy.types.NodeSocket) and not clearcoat_roughness_socket.is_linked:
clearcoat_extension['clearcoatRoughnessFactor'] = clearcoat_roughness_socket.default_value
elif gltf2_blender_get.has_image_node_from_socket(clearcoat_roughness_socket):
fac = gltf2_blender_get.get_factor_from_socket(clearcoat_roughness_socket, kind='VALUE')
# default value in glTF is 0.0, but if there is a texture without factor, use 1
clearcoat_extension['clearcoatRoughnessFactor'] = fac if fac != None else 1.0
has_clearcoat_roughness_texture = True
# Pack clearcoat (R) and clearcoatRoughness (G) channels.
if has_clearcoat_texture and has_clearcoat_roughness_texture:
clearcoat_roughness_slots = (clearcoat_socket, clearcoat_roughness_socket,)
elif has_clearcoat_texture:
clearcoat_roughness_slots = (clearcoat_socket,)
elif has_clearcoat_roughness_texture:
clearcoat_roughness_slots = (clearcoat_roughness_socket,)
use_actives_uvmaps = []
if len(clearcoat_roughness_slots) > 0:
if has_clearcoat_texture:
clearcoat_texture, clearcoat_texture_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
clearcoat_socket,
clearcoat_roughness_slots,
export_settings,
)
clearcoat_extension['clearcoatTexture'] = clearcoat_texture
if clearcoat_texture_use_active_uvmap:
use_actives_uvmaps.append("clearcoatTexture")
if has_clearcoat_roughness_texture:
clearcoat_roughness_texture, clearcoat_roughness_texture_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
clearcoat_roughness_socket,
clearcoat_roughness_slots,
export_settings,
)
clearcoat_extension['clearcoatRoughnessTexture'] = clearcoat_roughness_texture
if clearcoat_roughness_texture_use_active_uvmap:
use_actives_uvmaps.append("clearcoatRoughnessTexture")
if gltf2_blender_get.has_image_node_from_socket(clearcoat_normal_socket):
clearcoat_normal_texture, clearcoat_normal_texture_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_material_normal_texture_info_class(
clearcoat_normal_socket,
(clearcoat_normal_socket,),
export_settings
)
clearcoat_extension['clearcoatNormalTexture'] = clearcoat_normal_texture
if clearcoat_normal_texture_use_active_uvmap:
use_actives_uvmaps.append("clearcoatNormalTexture")
return Extension('KHR_materials_clearcoat', clearcoat_extension, False), use_actives_uvmaps
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