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diff --git a/extern/draco/src/draco-compressor.h b/extern/draco/src/draco-compressor.h
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+/*
+ * 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.
+ */
+
+/**
+ * C++ library for the Draco compression feature inside the glTF-Blender-IO project.
+ *
+ * The python side uses the CTypes library to open the DLL, load function
+ * pointers add pass the data to the compressor as raw bytes.
+ *
+ * The compressor intercepts the regular glTF exporter after data has been
+ * gathered and right before the data is converted to a JSON representation,
+ * which is going to be written out.
+ *
+ * The original uncompressed data is removed and replaces an extension,
+ * pointing to the newly created buffer containing the compressed data.
+ *
+ * @author Jim Eckerlein <eckerlein@ux3d.io>
+ * @date   2019-11-29
+ */
+
+#include <cstdint>
+
+#if defined(_MSC_VER)
+#define DLL_EXPORT(retType) extern "C" __declspec(dllexport) retType __cdecl
+#else
+#define DLL_EXPORT(retType) extern "C" retType
+#endif
+
+/**
+ * This tuple is opaquely exposed to Python through a pointer.
+ * It encapsulates the complete current compressor state.
+ *
+ * A single instance is only intended to compress a single primitive.
+ */
+struct DracoCompressor;
+
+DLL_EXPORT(DracoCompressor *)
+create_compressor ();
+
+DLL_EXPORT(void)
+set_compression_level (
+    DracoCompressor *compressor,
+    uint32_t compressionLevel
+);
+
+DLL_EXPORT(void)
+set_position_quantization (
+    DracoCompressor *compressor,
+    uint32_t quantizationBitsPosition
+);
+
+DLL_EXPORT(void)
+set_normal_quantization (
+    DracoCompressor *compressor,
+    uint32_t quantizationBitsNormal
+);
+
+DLL_EXPORT(void)
+set_uv_quantization (
+    DracoCompressor *compressor,
+    uint32_t quantizationBitsTexCoord
+);
+
+DLL_EXPORT(void)
+set_generic_quantization (
+    DracoCompressor *compressor,
+    uint32_t bits
+);
+
+/// Compresses a mesh.
+/// Use `compress_morphed` when compressing primitives which have morph targets.
+DLL_EXPORT(bool)
+compress (
+    DracoCompressor *compressor
+);
+
+/// Compresses the mesh.
+/// Use this instead of `compress`, because this procedure takes into account that mesh triangles must not be reordered.
+DLL_EXPORT(bool)
+compress_morphed (
+    DracoCompressor *compressor
+);
+
+/**
+ * Returns the size of the compressed data in bytes.
+ */
+DLL_EXPORT(uint64_t)
+get_compressed_size (
+    DracoCompressor const *compressor
+);
+
+/**
+ * Copies the compressed mesh into the given byte buffer.
+ *
+ * @param[o_data] A Python `bytes` object.
+ */
+DLL_EXPORT(void)
+copy_to_bytes (
+    DracoCompressor const *compressor,
+    uint8_t *o_data
+);
+
+/**
+ * Releases all memory allocated by the compressor.
+ */
+DLL_EXPORT(void)
+destroy_compressor (
+    DracoCompressor *compressor
+);
+
+DLL_EXPORT(void)
+set_faces (
+    DracoCompressor *compressor,
+    uint32_t index_count,
+    uint32_t index_byte_length,
+    uint8_t const *indices
+);
+
+/// Adds a `float` position attribute to the current mesh.
+/// Returns the id Draco has assigned to this attribute.
+DLL_EXPORT(uint32_t)
+add_positions_f32 (
+    DracoCompressor *compressor,
+    uint32_t count,
+    uint8_t const *data
+);
+
+/// Adds a `float` normal attribute to the current mesh.
+/// Returns the id Draco has assigned to this attribute.
+DLL_EXPORT(uint32_t)
+add_normals_f32 (
+    DracoCompressor *compressor,
+    uint32_t count,
+    uint8_t const *data
+);
+
+/// Adds a `float` texture coordinate attribute to the current mesh.
+/// Returns the id Draco has assigned to this attribute.
+DLL_EXPORT(uint32_t)
+add_uvs_f32 (
+    DracoCompressor *compressor,
+    uint32_t count,
+    uint8_t const *data
+);
+
+/// Adds a `unsigned short` joint attribute to the current mesh.
+/// Returns the id Draco has assigned to this attribute.
+DLL_EXPORT(uint32_t)
+add_joints_u16 (
+    DracoCompressor *compressor,
+    uint32_t count,
+    uint8_t const *data
+);
+
+/// Adds a `float` weight attribute to the current mesh.
+/// Returns the id Draco has assigned to this attribute.
+DLL_EXPORT(uint32_t)
+add_weights_f32 (
+    DracoCompressor *compressor,
+    uint32_t count,
+    uint8_t const *data
+);