glTF exporter: perf: use bytearrays
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@ -15,7 +15,7 @@
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bl_info = {
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'name': 'glTF 2.0 format',
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'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
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"version": (1, 4, 25),
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"version": (1, 4, 26),
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'blender': (2, 90, 0),
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'location': 'File > Import-Export',
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'description': 'Import-Export as glTF 2.0',
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@ -22,21 +22,23 @@ class Buffer:
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"""Class representing binary data for use in a glTF file as 'buffer' property."""
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def __init__(self, buffer_index=0):
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self.__data = b""
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self.__data = bytearray(b"")
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self.__buffer_index = buffer_index
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def add_and_get_view(self, binary_data: gltf2_io_binary_data.BinaryData) -> gltf2_io.BufferView:
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"""Add binary data to the buffer. Return a glTF BufferView."""
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offset = len(self.__data)
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self.__data += binary_data.data
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self.__data.extend(binary_data.data)
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length = binary_data.byte_length
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# offsets should be a multiple of 4 --> therefore add padding if necessary
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padding = (4 - (binary_data.byte_length % 4)) % 4
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self.__data += b"\x00" * padding
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padding = (4 - (length % 4)) % 4
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self.__data.extend(b"\x00" * padding)
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buffer_view = gltf2_io.BufferView(
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buffer=self.__buffer_index,
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byte_length=binary_data.byte_length,
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byte_length=length,
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byte_offset=offset,
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byte_stride=None,
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extensions=None,
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