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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
import base64
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.io.exp import gltf2_io_binary_data
class Buffer:
"""Class representing binary data for use in a glTF file as 'buffer' property."""
def __init__(self, buffer_index=0, initial_data=None):
self.__data = bytearray(b"")
if initial_data is not None:
self.__data = bytearray(initial_data.tobytes())
self.__buffer_index = buffer_index
def add_and_get_view(self, binary_data: gltf2_io_binary_data.BinaryData) -> gltf2_io.BufferView:
"""Add binary data to the buffer. Return a glTF BufferView."""
offset = len(self.__data)
self.__data.extend(binary_data.data)
length = binary_data.byte_length
# offsets should be a multiple of 4 --> therefore add padding if necessary
padding = (4 - (length % 4)) % 4
self.__data.extend(b"\x00" * padding)
buffer_view = gltf2_io.BufferView(
buffer=self.__buffer_index,
byte_length=length,
byte_offset=offset,
byte_stride=None,
extensions=None,
extras=None,
name=None,
target=binary_data.bufferViewTarget
)
return buffer_view
@property
def byte_length(self):
return len(self.__data)
def to_bytes(self):
return self.__data
def to_embed_string(self):
return 'data:application/octet-stream;base64,' + base64.b64encode(self.__data).decode('ascii')
def clear(self):
self.__data = b""
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