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# Copyright 2018-2021 The glTF-Blender-IO authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import bpy
import typing
import os
from . import gltf2_blender_export_keys
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.blender.exp import gltf2_blender_search_node_tree
from io_scene_gltf2.io.exp import gltf2_io_binary_data
from io_scene_gltf2.io.exp import gltf2_io_image_data
from io_scene_gltf2.io.com import gltf2_io_debug
from io_scene_gltf2.blender.exp.gltf2_blender_image import Channel, ExportImage, FillImage
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extensions
@cached
def gather_image(
blender_shader_sockets: typing.Tuple[bpy.types.NodeSocket],
export_settings):
if not __filter_image(blender_shader_sockets, export_settings):
return None
image_data = __get_image_data(blender_shader_sockets, export_settings)
if image_data.empty():
# The export image has no data
return None
mime_type = __gather_mime_type(blender_shader_sockets, image_data, export_settings)
name = __gather_name(image_data, export_settings)
uri = __gather_uri(image_data, mime_type, name, export_settings)
buffer_view = __gather_buffer_view(image_data, mime_type, name, export_settings)
image = __make_image(
buffer_view,
__gather_extensions(blender_shader_sockets, export_settings),
__gather_extras(blender_shader_sockets, export_settings),
mime_type,
name,
uri,
export_settings
)
export_user_extensions('gather_image_hook', export_settings, image, blender_shader_sockets)
return image
@cached
def __make_image(buffer_view, extensions, extras, mime_type, name, uri, export_settings):
return gltf2_io.Image(
buffer_view=buffer_view,
extensions=extensions,
extras=extras,
mime_type=mime_type,
name=name,
uri=uri
)
def __filter_image(sockets, export_settings):
if not sockets:
return False
return True
@cached
def __gather_buffer_view(image_data, mime_type, name, export_settings):
if export_settings[gltf2_blender_export_keys.FORMAT] != 'GLTF_SEPARATE':
return gltf2_io_binary_data.BinaryData(data=image_data.encode(mime_type))
return None
def __gather_extensions(sockets, export_settings):
return None
def __gather_extras(sockets, export_settings):
return None
def __gather_mime_type(sockets, export_image, export_settings):
# force png if Alpha contained so we can export alpha
for socket in sockets:
if socket.name == "Alpha":
return "image/png"
if export_settings["gltf_image_format"] == "AUTO":
image = export_image.blender_image()
if image is not None and __is_blender_image_a_jpeg(image):
return "image/jpeg"
return "image/png"
elif export_settings["gltf_image_format"] == "JPEG":
return "image/jpeg"
def __gather_name(export_image, export_settings):
# Find all Blender images used in the ExportImage
imgs = []
for fill in export_image.fills.values():
if isinstance(fill, FillImage):
img = fill.image
if img not in imgs:
imgs.append(img)
# If all the images have the same path, use the common filename
filepaths = set(img.filepath for img in imgs)
if len(filepaths) == 1:
filename = os.path.basename(list(filepaths)[0])
name, extension = os.path.splitext(filename)
if extension.lower() in ['.png', '.jpg', '.jpeg']:
if name:
return name
# Combine the image names: img1-img2-img3
names = []
for img in imgs:
name, extension = os.path.splitext(img.name)
names.append(name)
name = '-'.join(names)
return name or 'Image'
@cached
def __gather_uri(image_data, mime_type, name, export_settings):
if export_settings[gltf2_blender_export_keys.FORMAT] == 'GLTF_SEPARATE':
# as usual we just store the data in place instead of already resolving the references
return gltf2_io_image_data.ImageData(
data=image_data.encode(mime_type=mime_type),
mime_type=mime_type,
name=name
)
return None
def __get_image_data(sockets, export_settings) -> ExportImage:
# For shared resources, such as images, we just store the portion of data that is needed in the glTF property
# in a helper class. During generation of the glTF in the exporter these will then be combined to actual binary
# resources.
results = [__get_tex_from_socket(socket, export_settings) for socket in sockets]
composed_image = ExportImage()
for result, socket in zip(results, sockets):
if result.shader_node.image.channels == 0:
gltf2_io_debug.print_console("WARNING",
"Image '{}' has no color channels and cannot be exported.".format(
result.shader_node.image))
continue
# rudimentarily try follow the node tree to find the correct image data.
src_chan = Channel.R
for elem in result.path:
if isinstance(elem.from_node, bpy.types.ShaderNodeSeparateRGB):
src_chan = {
'R': Channel.R,
'G': Channel.G,
'B': Channel.B,
}[elem.from_socket.name]
if elem.from_socket.name == 'Alpha':
src_chan = Channel.A
dst_chan = None
# some sockets need channel rewriting (gltf pbr defines fixed channels for some attributes)
if socket.name == 'Metallic':
dst_chan = Channel.B
elif socket.name == 'Roughness':
dst_chan = Channel.G
elif socket.name == 'Occlusion':
dst_chan = Channel.R
elif socket.name == 'Alpha':
dst_chan = Channel.A
elif socket.name == 'Clearcoat':
dst_chan = Channel.R
elif socket.name == 'Clearcoat Roughness':
dst_chan = Channel.G
if dst_chan is not None:
composed_image.fill_image(result.shader_node.image, dst_chan, src_chan)
# Since metal/roughness are always used together, make sure
# the other channel is filled.
if socket.name == 'Metallic' and not composed_image.is_filled(Channel.G):
composed_image.fill_white(Channel.G)
elif socket.name == 'Roughness' and not composed_image.is_filled(Channel.B):
composed_image.fill_white(Channel.B)
else:
# copy full image...eventually following sockets might overwrite things
composed_image = ExportImage.from_blender_image(result.shader_node.image)
return composed_image
@cached
def __get_tex_from_socket(blender_shader_socket: bpy.types.NodeSocket, export_settings):
result = gltf2_blender_search_node_tree.from_socket(
blender_shader_socket,
gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeTexImage))
if not result:
return None
return result[0]
def __is_blender_image_a_jpeg(image: bpy.types.Image) -> bool:
if image.source != 'FILE':
return False
path = image.filepath_raw.lower()
return path.endswith('.jpg') or path.endswith('.jpeg') or path.endswith('.jpe')
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