Initial commit of glTF 2.0 importer/exporter

Official Khronos Group Blender glTF 2.0 importer and exporter.

glTF specification: https://github.com/KhronosGroup/glTF
The upstream repository can be found here:
https://github.com/KhronosGroup/glTF-Blender-IO

Reviewed By: Bastien, Campbell

Differential Revision: https://developer.blender.org/D3929

1 files changed, 61 insertions, 0 deletions

diff --git a/io_scene_gltf2/io/exp/gltf2_io_buffer.py b/io_scene_gltf2/io/exp/gltf2_io_buffer.py
new file mode 100755
index 00000000..694be11e
--- /dev/null
+++ b/io_scene_gltf2/io/exp/gltf2_io_buffer.py
@@ -0,0 +1,61 @@
+# 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 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):
+        self.__data = b""
+        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 += binary_data.data
+
+        # offsets should be a multiple of 4 --> therefore add padding if necessary
+        padding = (4 - (binary_data.byte_length % 4)) % 4
+        self.__data += b"\x00" * padding
+
+        buffer_view = gltf2_io.BufferView(
+            buffer=self.__buffer_index,
+            byte_length=binary_data.byte_length,
+            byte_offset=offset,
+            byte_stride=None,
+            extensions=None,
+            extras=None,
+            name=None,
+            target=None
+        )
+        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""
+