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diff --git a/extern/draco/draco/src/draco/compression/attributes/attributes_decoder.h b/extern/draco/draco/src/draco/compression/attributes/attributes_decoder.h
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+// Copyright 2016 The Draco 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.
+//
+#ifndef DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTES_DECODER_H_
+#define DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTES_DECODER_H_
+
+#include <vector>
+
+#include "draco/compression/attributes/attributes_decoder_interface.h"
+#include "draco/compression/point_cloud/point_cloud_decoder.h"
+#include "draco/core/decoder_buffer.h"
+#include "draco/draco_features.h"
+#include "draco/point_cloud/point_cloud.h"
+
+namespace draco {
+
+// Base class for decoding one or more attributes that were encoded with a
+// matching AttributesEncoder. It is a basic implementation of
+// AttributesDecoderInterface that provides functionality that is shared between
+// all AttributesDecoders.
+class AttributesDecoder : public AttributesDecoderInterface {
+ public:
+  AttributesDecoder();
+  virtual ~AttributesDecoder() = default;
+
+  // Called after all attribute decoders are created. It can be used to perform
+  // any custom initialization.
+  bool Init(PointCloudDecoder *decoder, PointCloud *pc) override;
+
+  // Decodes any attribute decoder specific data from the |in_buffer|.
+  bool DecodeAttributesDecoderData(DecoderBuffer *in_buffer) override;
+
+  int32_t GetAttributeId(int i) const override {
+    return point_attribute_ids_[i];
+  }
+  int32_t GetNumAttributes() const override {
+    return static_cast<int32_t>(point_attribute_ids_.size());
+  }
+  PointCloudDecoder *GetDecoder() const override {
+    return point_cloud_decoder_;
+  }
+
+  // Decodes attribute data from the source buffer.
+  bool DecodeAttributes(DecoderBuffer *in_buffer) override {
+    if (!DecodePortableAttributes(in_buffer)) {
+      return false;
+    }
+    if (!DecodeDataNeededByPortableTransforms(in_buffer)) {
+      return false;
+    }
+    if (!TransformAttributesToOriginalFormat()) {
+      return false;
+    }
+    return true;
+  }
+
+ protected:
+  int32_t GetLocalIdForPointAttribute(int32_t point_attribute_id) const {
+    const int id_map_size =
+        static_cast<int>(point_attribute_to_local_id_map_.size());
+    if (point_attribute_id >= id_map_size) {
+      return -1;
+    }
+    return point_attribute_to_local_id_map_[point_attribute_id];
+  }
+  virtual bool DecodePortableAttributes(DecoderBuffer *in_buffer) = 0;
+  virtual bool DecodeDataNeededByPortableTransforms(DecoderBuffer *in_buffer) {
+    return true;
+  }
+  virtual bool TransformAttributesToOriginalFormat() { return true; }
+
+ private:
+  // List of attribute ids that need to be decoded with this decoder.
+  std::vector<int32_t> point_attribute_ids_;
+
+  // Map between point attribute id and the local id (i.e., the inverse of the
+  // |point_attribute_ids_|.
+  std::vector<int32_t> point_attribute_to_local_id_map_;
+
+  PointCloudDecoder *point_cloud_decoder_;
+  PointCloud *point_cloud_;
+};
+
+}  // namespace draco
+
+#endif  // DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTES_DECODER_H_