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# Copyright 2018 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 re
import bpy
import typing
import os
import numpy as np
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
def gather_image(
blender_shader_sockets_or_texture_slots: typing.Union[typing.Tuple[bpy.types.NodeSocket],
typing.Tuple[bpy.types.Texture]],
export_settings):
if not __filter_image(blender_shader_sockets_or_texture_slots, export_settings):
return None
uri = __gather_uri(blender_shader_sockets_or_texture_slots, export_settings)
buffer_view = __gather_buffer_view(blender_shader_sockets_or_texture_slots, export_settings)
if not (uri is not None or buffer_view is not None):
# The blender image has no data
return None
mime_type = __gather_mime_type(uri.filepath if uri is not None else "")
image = gltf2_io.Image(
buffer_view=buffer_view,
extensions=__gather_extensions(blender_shader_sockets_or_texture_slots, export_settings),
extras=__gather_extras(blender_shader_sockets_or_texture_slots, export_settings),
mime_type=mime_type,
name=__gather_name(blender_shader_sockets_or_texture_slots, export_settings),
uri=uri
)
return image
def __filter_image(sockets_or_slots, export_settings):
if not sockets_or_slots:
return False
return True
def __gather_buffer_view(sockets_or_slots, export_settings):
if export_settings[gltf2_blender_export_keys.FORMAT] != 'GLTF_SEPARATE':
image = __get_image_data(sockets_or_slots, export_settings)
if image is None:
return None
return gltf2_io_binary_data.BinaryData(
data=image.to_image_data(__gather_mime_type()))
return None
def __gather_extensions(sockets_or_slots, export_settings):
return None
def __gather_extras(sockets_or_slots, export_settings):
return None
def __gather_mime_type(filepath=""):
extension_types = {'.png': 'image/png', '.jpg': 'image/jpeg', '.jpeg': 'image/jpeg'}
default_extension = extension_types['.png']
matches = re.findall(r'\.\w+$', filepath)
extension = matches[0] if len(matches) > 0 else default_extension
return extension_types[extension] if extension.lower() in extension_types.keys() else default_extension
def __gather_name(sockets_or_slots, export_settings):
if __is_socket(sockets_or_slots):
node = __get_tex_from_socket(sockets_or_slots[0])
if node is not None:
return node.shader_node.image.name
elif isinstance(sockets_or_slots[0], bpy.types.MaterialTextureSlot):
return sockets_or_slots[0].name
return None
def __gather_uri(sockets_or_slots, 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 __get_image_data(sockets_or_slots, export_settings)
return None
def __is_socket(sockets_or_slots):
return isinstance(sockets_or_slots[0], bpy.types.NodeSocket)
def __is_slot(sockets_or_slots):
return isinstance(sockets_or_slots[0], bpy.types.MaterialTextureSlot)
def __get_image_data(sockets_or_slots, export_settings):
# For shared ressources, 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
# ressources.
def split_pixels_by_channels(image: bpy.types.Image, export_settings) -> typing.Optional[typing.List[typing.List[float]]]:
channelcache = export_settings['gltf_channelcache']
if image.name in channelcache:
return channelcache[image.name]
pixels = np.array(image.pixels)
pixels = pixels.reshape((pixels.shape[0] // image.channels, image.channels))
channels = np.split(pixels, pixels.shape[1], axis=1)
channelcache[image.name] = channels
return channels
if __is_socket(sockets_or_slots):
results = [__get_tex_from_socket(socket) for socket in sockets_or_slots]
image = None
for result, socket in zip(results, sockets_or_slots):
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.
source_channel = None
target_channel = None
source_channels_length = None
for elem in result.path:
if isinstance(elem.from_node, bpy.types.ShaderNodeSeparateRGB):
source_channel = {
'R': 0,
'G': 1,
'B': 2
}[elem.from_socket.name]
if source_channel is not None:
pixels = [split_pixels_by_channels(result.shader_node.image, export_settings)[source_channel]]
target_channel = source_channel
source_channel = 0
source_channels_length = 1
else:
pixels = split_pixels_by_channels(result.shader_node.image, export_settings)
target_channel = 0
source_channel = 0
source_channels_length = len(pixels)
# Change target channel for metallic and roughness.
if elem.to_socket.name == 'Metallic':
target_channel = 2
source_channels_length = 1
elif elem.to_socket.name == 'Roughness':
target_channel = 1
source_channels_length = 1
file_name = os.path.splitext(result.shader_node.image.name)[0]
if result.shader_node.image.packed_file is None:
file_path = result.shader_node.image.filepath
else:
# empty path for packed textures, because they are converted to png anyway
file_path = ""
image_data = gltf2_io_image_data.ImageData(
file_name,
file_path,
result.shader_node.image.size[0],
result.shader_node.image.size[1],
source_channel,
target_channel,
source_channels_length,
pixels)
if image is None:
image = image_data
else:
image.add_to_image(target_channel, image_data)
return image
elif __is_slot(sockets_or_slots):
texture = __get_tex_from_slot(sockets_or_slots[0])
pixels = split_pixels_by_channels(texture.image, export_settings)
image_data = gltf2_io_image_data.ImageData(
texture.name,
texture.image.filepath,
texture.image.size[0],
texture.image.size[1],
0,
0,
len(pixels),
pixels)
return image_data
else:
# Texture slots
raise NotImplementedError()
def __get_tex_from_socket(blender_shader_socket: bpy.types.NodeSocket):
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 __get_tex_from_slot(blender_texture_slot):
return blender_texture_slot.texture
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