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diff --git a/extern/draco/draco/src/draco/mesh/triangle_soup_mesh_builder.h b/extern/draco/draco/src/draco/mesh/triangle_soup_mesh_builder.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_MESH_TRIANGLE_SOUP_MESH_BUILDER_H_
+#define DRACO_MESH_TRIANGLE_SOUP_MESH_BUILDER_H_
+
+#include "draco/draco_features.h"
+#include "draco/mesh/mesh.h"
+
+namespace draco {
+
+// Class for building meshes directly from attribute values that can be
+// specified for each face corner. All attributes are automatically
+// deduplicated.
+class TriangleSoupMeshBuilder {
+ public:
+  // Starts mesh building for a given number of faces.
+  // TODO(ostava): Currently it's necessary to select the correct number of
+  // faces upfront. This should be generalized, but it will require us to
+  // rewrite our attribute resizing functions.
+  void Start(int num_faces);
+
+  // Adds an empty attribute to the mesh. Returns the new attribute's id.
+  int AddAttribute(GeometryAttribute::Type attribute_type,
+                   int8_t num_components, DataType data_type);
+
+  // Sets values for a given attribute on all corners of a given face.
+  void SetAttributeValuesForFace(int att_id, FaceIndex face_id,
+                                 const void *corner_value_0,
+                                 const void *corner_value_1,
+                                 const void *corner_value_2);
+
+  // Sets value for a per-face attribute. If all faces of a given attribute are
+  // set with this method, the attribute will be marked as per-face, otherwise
+  // it will be marked as per-corner attribute.
+  void SetPerFaceAttributeValueForFace(int att_id, FaceIndex face_id,
+                                       const void *value);
+
+  // Finalizes the mesh or returns nullptr on error.
+  // Once this function is called, the builder becomes invalid and cannot be
+  // used until the method Start() is called again.
+  std::unique_ptr<Mesh> Finalize();
+
+ private:
+  std::vector<int8_t> attribute_element_types_;
+
+  std::unique_ptr<Mesh> mesh_;
+};
+
+}  // namespace draco
+
+#endif  // DRACO_MESH_TRIANGLE_SOUP_MESH_BUILDER_H_