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diff --git a/extern/draco/draco/src/draco/compression/attributes/prediction_schemes/prediction_scheme_interface.h b/extern/draco/draco/src/draco/compression/attributes/prediction_schemes/prediction_scheme_interface.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_PREDICTION_SCHEMES_PREDICTION_SCHEME_INTERFACE_H_
+#define DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_PREDICTION_SCHEME_INTERFACE_H_
+
+#include "draco/attributes/point_attribute.h"
+#include "draco/compression/config/compression_shared.h"
+
+// Prediction schemes can be used during encoding and decoding of attributes
+// to predict attribute values based on the previously encoded/decoded data.
+// See prediction_scheme.h for more details.
+namespace draco {
+
+// Abstract interface for all prediction schemes used during attribute encoding.
+class PredictionSchemeInterface {
+ public:
+  virtual ~PredictionSchemeInterface() = default;
+  virtual PredictionSchemeMethod GetPredictionMethod() const = 0;
+
+  // Returns the encoded attribute.
+  virtual const PointAttribute *GetAttribute() const = 0;
+
+  // Returns true when the prediction scheme is initialized with all data it
+  // needs.
+  virtual bool IsInitialized() const = 0;
+
+  // Returns the number of parent attributes that are needed for the prediction.
+  virtual int GetNumParentAttributes() const = 0;
+
+  // Returns the type of each of the parent attribute.
+  virtual GeometryAttribute::Type GetParentAttributeType(int i) const = 0;
+
+  // Sets the required parent attribute.
+  // Returns false if the attribute doesn't meet the requirements of the
+  // prediction scheme.
+  virtual bool SetParentAttribute(const PointAttribute *att) = 0;
+
+  // Method should return true if the prediction scheme guarantees that all
+  // correction values are always positive (or at least non-negative).
+  virtual bool AreCorrectionsPositive() = 0;
+
+  // Returns the transform type used by the prediction scheme.
+  virtual PredictionSchemeTransformType GetTransformType() const = 0;
+};
+
+}  // namespace draco
+
+#endif  // DRACO_COMPRESSION_ATTRIBUTES_PREDICTION_SCHEMES_PREDICTION_SCHEME_INTERFACE_H_