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# Copyright 2018-2019 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.
from ..com.gltf2_io import gltf_from_dict
from ..com.gltf2_io_debug import Log
import logging
import json
import struct
import base64
from os.path import dirname, join, isfile
from urllib.parse import unquote
class glTFImporter():
"""glTF Importer class."""
def __init__(self, filename, import_settings):
"""initialization."""
self.filename = filename
self.import_settings = import_settings
self.glb_buffer = None
self.buffers = {}
self.accessor_cache = {}
self.decode_accessor_cache = {}
if 'loglevel' not in self.import_settings.keys():
self.import_settings['loglevel'] = logging.ERROR
log = Log(import_settings['loglevel'])
self.log = log.logger
self.log_handler = log.hdlr
# TODO: move to a com place?
self.extensions_managed = [
'KHR_materials_pbrSpecularGlossiness',
'KHR_lights_punctual',
'KHR_materials_unlit',
'KHR_texture_transform',
'KHR_materials_clearcoat',
'KHR_mesh_quantization',
]
# TODO : merge with io_constants
self.fmt_char_dict = {}
self.fmt_char_dict[5120] = 'b' # Byte
self.fmt_char_dict[5121] = 'B' # Unsigned Byte
self.fmt_char_dict[5122] = 'h' # Short
self.fmt_char_dict[5123] = 'H' # Unsigned Short
self.fmt_char_dict[5125] = 'I' # Unsigned Int
self.fmt_char_dict[5126] = 'f' # Float
self.component_nb_dict = {}
self.component_nb_dict['SCALAR'] = 1
self.component_nb_dict['VEC2'] = 2
self.component_nb_dict['VEC3'] = 3
self.component_nb_dict['VEC4'] = 4
self.component_nb_dict['MAT2'] = 4
self.component_nb_dict['MAT3'] = 9
self.component_nb_dict['MAT4'] = 16
@staticmethod
def bad_json_value(val):
"""Bad Json value."""
raise ValueError('Json contains some unauthorized values')
def checks(self):
"""Some checks."""
if self.data.asset.version != "2.0":
return False, "glTF version must be 2"
if self.data.extensions_required is not None:
for extension in self.data.extensions_required:
if extension not in self.data.extensions_used:
return False, "Extension required must be in Extension Used too"
if extension not in self.extensions_managed:
return False, "Extension " + extension + " is not available on this addon version"
if self.data.extensions_used is not None:
for extension in self.data.extensions_used:
if extension not in self.extensions_managed:
# Non blocking error #TODO log
pass
return True, None
def load_glb(self):
"""Load binary glb."""
header = struct.unpack_from('<4sII', self.content)
self.format = header[0]
self.version = header[1]
self.file_size = header[2]
if self.format != b'glTF':
return False, "This file is not a glTF/glb file"
if self.version != 2:
return False, "GLB version %d unsupported" % self.version
if self.file_size != len(self.content):
return False, "Bad GLB: file size doesn't match"
offset = 12 # header size = 12
# JSON chunk is first
type_, len_, json_bytes, offset = self.load_chunk(offset)
if type_ != b"JSON":
return False, "Bad GLB: first chunk not JSON"
if len_ != len(json_bytes):
return False, "Bad GLB: length of json chunk doesn't match"
try:
json_str = str(json_bytes, encoding='utf-8')
json_ = json.loads(json_str, parse_constant=glTFImporter.bad_json_value)
self.data = gltf_from_dict(json_)
except ValueError as e:
return False, e.args[0]
# BIN chunk is second (if it exists)
if offset < len(self.content):
type_, len_, data, offset = self.load_chunk(offset)
if type_ == b"BIN\0":
if len_ != len(data):
return False, "Bad GLB: length of BIN chunk doesn't match"
self.glb_buffer = data
return True, None
def load_chunk(self, offset):
"""Load chunk."""
chunk_header = struct.unpack_from('<I4s', self.content, offset)
data_length = chunk_header[0]
data_type = chunk_header[1]
data = self.content[offset + 8: offset + 8 + data_length]
return data_type, data_length, data, offset + 8 + data_length
def read(self):
"""Read file."""
# Check this is a file
if not isfile(self.filename):
return False, "Please select a file"
# Check if file is gltf or glb
with open(self.filename, 'rb') as f:
self.content = memoryview(f.read())
self.is_glb_format = self.content[:4] == b'glTF'
# glTF file
if not self.is_glb_format:
content = str(self.content, encoding='utf-8')
self.content = None
try:
self.data = gltf_from_dict(json.loads(content, parse_constant=glTFImporter.bad_json_value))
return True, None
except ValueError as e:
return False, e.args[0]
# glb file
else:
# Parsing glb file
success, txt = self.load_glb()
self.content = None
return success, txt
def load_buffer(self, buffer_idx):
"""Load buffer."""
buffer = self.data.buffers[buffer_idx]
if buffer.uri:
data = self.load_uri(buffer.uri)
if data is not None:
self.buffers[buffer_idx] = data
else:
# GLB-stored buffer
if buffer_idx == 0 and self.glb_buffer is not None:
self.buffers[buffer_idx] = self.glb_buffer
def load_uri(self, uri):
"""Loads a URI."""
sep = ';base64,'
if uri.startswith('data:'):
idx = uri.find(sep)
if idx != -1:
data = uri[idx + len(sep):]
return memoryview(base64.b64decode(data))
path = join(dirname(self.filename), unquote(uri))
try:
with open(path, 'rb') as f_:
return memoryview(f_.read())
except Exception:
self.log.error("Couldn't read file: " + path)
return None
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