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diff --git a/extern/draco/src/encoder.h b/extern/draco/src/encoder.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.
+ */
+
+/**
+ * Library for the Draco encoding/decoding feature inside the glTF-Blender-IO project.
+ *
+ * The python script within glTF-Blender-IO uses the CTypes library to open the DLL,
+ * load function pointers add pass the raw data to the encoder.
+ *
+ * @author Jim Eckerlein <eckerlein@ux3d.io>
+ * @date   2020-11-18
+ */
+
+#pragma once
+
+#include "common.h"
+
+struct Encoder;
+
+API(Encoder *) encoderCreate(uint32_t vertexCount);
+
+API(void) encoderRelease(Encoder *encoder);
+
+API(void) encoderSetCompressionLevel(Encoder *encoder, uint32_t compressionLevel);
+
+API(void) encoderSetQuantizationBits(Encoder *encoder, uint32_t position, uint32_t normal, uint32_t uv, uint32_t color, uint32_t generic);
+
+API(bool) encoderEncode(Encoder *encoder, uint8_t preserveTriangleOrder);
+
+API(uint64_t) encoderGetByteLength(Encoder *encoder);
+
+API(void) encoderCopy(Encoder *encoder, uint8_t *data);
+
+API(void) encoderSetIndices(Encoder *encoder, size_t indexComponentType, uint32_t indexCount, void *indices);
+
+API(uint32_t) encoderSetAttribute(Encoder *encoder, char *attributeName, size_t componentType, char *dataType, void *data);
+
+API(uint32_t) encoderGetEncodedVertexCount(Encoder *encoder);
+
+API(uint32_t) encoderGetEncodedIndexCount(Encoder *encoder);