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diff --git a/extern/draco/dracoenc/src/draco/compression/attributes/attributes_decoder_interface.h b/extern/draco/dracoenc/src/draco/compression/attributes/attributes_decoder_interface.h
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+// Copyright 2017 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_INTERFACE_H_
+#define DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTES_DECODER_INTERFACE_H_
+
+#include <vector>
+
+#include "draco/core/decoder_buffer.h"
+#include "draco/point_cloud/point_cloud.h"
+
+namespace draco {
+
+class PointCloudDecoder;
+
+// Interface class for decoding one or more attributes that were encoded with a
+// matching AttributesEncoder. It provides only the basic interface
+// that is used by the PointCloudDecoder. The actual decoding must be
+// implemented in derived classes using the DecodeAttributes() method.
+class AttributesDecoderInterface {
+ public:
+  AttributesDecoderInterface() = default;
+  virtual ~AttributesDecoderInterface() = default;
+
+  // Called after all attribute decoders are created. It can be used to perform
+  // any custom initialization.
+  virtual bool Init(PointCloudDecoder *decoder, PointCloud *pc) = 0;
+
+  // Decodes any attribute decoder specific data from the |in_buffer|.
+  virtual bool DecodeAttributesDecoderData(DecoderBuffer *in_buffer) = 0;
+
+  // Decode attribute data from the source buffer. Needs to be implemented by
+  // the derived classes.
+  virtual bool DecodeAttributes(DecoderBuffer *in_buffer) = 0;
+
+  virtual int32_t GetAttributeId(int i) const = 0;
+  virtual int32_t GetNumAttributes() const = 0;
+  virtual PointCloudDecoder *GetDecoder() const = 0;
+
+  // Returns an attribute containing data processed by the attribute transform.
+  // (see TransformToPortableFormat() method). This data is guaranteed to be
+  // same for encoder and decoder and it can be used by predictors.
+  virtual const PointAttribute *GetPortableAttribute(
+      int32_t /* point_attribute_id */) {
+    return nullptr;
+  }
+};
+
+}  // namespace draco
+
+#endif  // DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTES_DECODER_INTERFACE_H_