1 files changed, 63 insertions, 0 deletions
diff --git a/extern/draco/draco/src/draco/mesh/mesh_misc_functions.cc b/extern/draco/draco/src/draco/mesh/mesh_misc_functions.cc
new file mode 100644
index 00000000000..4485b3369ac
--- /dev/null
+++ b/extern/draco/draco/src/draco/mesh/mesh_misc_functions.cc
@@ -0,0 +1,63 @@
+// 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.
+//
+#include "draco/mesh/mesh_misc_functions.h"
+
+namespace draco {
+
+std::unique_ptr<CornerTable> CreateCornerTableFromPositionAttribute(
+    const Mesh *mesh) {
+  return CreateCornerTableFromAttribute(mesh, GeometryAttribute::POSITION);
+}
+
+std::unique_ptr<CornerTable> CreateCornerTableFromAttribute(
+    const Mesh *mesh, GeometryAttribute::Type type) {
+  typedef CornerTable::FaceType FaceType;
+
+  const PointAttribute *const att = mesh->GetNamedAttribute(type);
+  if (att == nullptr) {
+    return nullptr;
+  }
+  IndexTypeVector<FaceIndex, FaceType> faces(mesh->num_faces());
+  FaceType new_face;
+  for (FaceIndex i(0); i < mesh->num_faces(); ++i) {
+    const Mesh::Face &face = mesh->face(i);
+    for (int j = 0; j < 3; ++j) {
+      // Map general vertex indices to attribute indices.
+      new_face[j] = att->mapped_index(face[j]).value();
+    }
+    faces[FaceIndex(i)] = new_face;
+  }
+  // Build the corner table.
+  return CornerTable::Create(faces);
+}
+
+std::unique_ptr<CornerTable> CreateCornerTableFromAllAttributes(
+    const Mesh *mesh) {
+  typedef CornerTable::FaceType FaceType;
+  IndexTypeVector<FaceIndex, FaceType> faces(mesh->num_faces());
+  FaceType new_face;
+  for (FaceIndex i(0); i < mesh->num_faces(); ++i) {
+    const Mesh::Face &face = mesh->face(i);
+    // Each face is identified by point indices that automatically split the
+    // mesh along attribute seams.
+    for (int j = 0; j < 3; ++j) {
+      new_face[j] = face[j].value();
+    }
+    faces[i] = new_face;
+  }
+  // Build the corner table.
+  return CornerTable::Create(faces);
+}
+}  // namespace draco