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diff --git a/extern/draco/dracoenc/src/draco/compression/attributes/sequential_integer_attribute_encoder.h b/extern/draco/dracoenc/src/draco/compression/attributes/sequential_integer_attribute_encoder.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_SEQUENTIAL_INTEGER_ATTRIBUTE_ENCODER_H_
+#define DRACO_COMPRESSION_ATTRIBUTES_SEQUENTIAL_INTEGER_ATTRIBUTE_ENCODER_H_
+
+#include "draco/compression/attributes/prediction_schemes/prediction_scheme_encoder.h"
+#include "draco/compression/attributes/sequential_attribute_encoder.h"
+
+namespace draco {
+
+// Attribute encoder designed for lossless encoding of integer attributes. The
+// attribute values can be pre-processed by a prediction scheme and compressed
+// with a built-in entropy coder.
+class SequentialIntegerAttributeEncoder : public SequentialAttributeEncoder {
+ public:
+  SequentialIntegerAttributeEncoder();
+  uint8_t GetUniqueId() const override {
+    return SEQUENTIAL_ATTRIBUTE_ENCODER_INTEGER;
+  }
+
+  bool Init(PointCloudEncoder *encoder, int attribute_id) override;
+  bool TransformAttributeToPortableFormat(
+      const std::vector<PointIndex> &point_ids) override;
+
+ protected:
+  bool EncodeValues(const std::vector<PointIndex> &point_ids,
+                    EncoderBuffer *out_buffer) override;
+
+  // Returns a prediction scheme that should be used for encoding of the
+  // integer values.
+  virtual std::unique_ptr<PredictionSchemeTypedEncoderInterface<int32_t>>
+  CreateIntPredictionScheme(PredictionSchemeMethod method);
+
+  // Prepares the integer values that are going to be encoded.
+  virtual bool PrepareValues(const std::vector<PointIndex> &point_ids,
+                             int num_points);
+
+  void PreparePortableAttribute(int num_entries, int num_components,
+                                int num_points);
+
+  int32_t *GetPortableAttributeData() {
+    return reinterpret_cast<int32_t *>(
+        portable_attribute()->GetAddress(AttributeValueIndex(0)));
+  }
+
+ private:
+  // Optional prediction scheme can be used to modify the integer values in
+  // order to make them easier to compress.
+  std::unique_ptr<PredictionSchemeTypedEncoderInterface<int32_t>>
+      prediction_scheme_;
+};
+
+}  // namespace draco
+
+#endif  // DRACO_COMPRESSION_ATTRIBUTES_SEQUENTIAL_INTEGER_ATTRIBUTE_ENCODER_H_