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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.
//
// This file contains misc functions that are needed by several mesh related
// algorithms.
#ifndef DRACO_MESH_MESH_MISC_FUNCTIONS_H_
#define DRACO_MESH_MESH_MISC_FUNCTIONS_H_
#include "draco/mesh/corner_table.h"
#include "draco/mesh/mesh.h"
// The file contains functions that use both Mesh and CornerTable as inputs.
namespace draco {
// Creates a CornerTable from the position attribute of |mesh|. Returns nullptr
// on error.
std::unique_ptr<CornerTable> CreateCornerTableFromPositionAttribute(
const Mesh *mesh);
// Creates a CornerTable from the first named attribute of |mesh| with a given
// type. Returns nullptr on error.
std::unique_ptr<CornerTable> CreateCornerTableFromAttribute(
const Mesh *mesh, GeometryAttribute::Type type);
// Creates a CornerTable from all attributes of |mesh|. Boundaries are
// automatically introduced on all attribute seams. Returns nullptr on error.
std::unique_ptr<CornerTable> CreateCornerTableFromAllAttributes(
const Mesh *mesh);
// Returns true when the given corner lies opposite to an attribute seam.
inline bool IsCornerOppositeToAttributeSeam(CornerIndex ci,
const PointAttribute &att,
const Mesh &mesh,
const CornerTable &ct) {
const CornerIndex opp_ci = ct.Opposite(ci);
if (opp_ci == kInvalidCornerIndex) {
return false; // No opposite corner == no attribute seam.
}
// Compare attribute value indices on both ends of the opposite edge.
CornerIndex c0 = ct.Next(ci);
CornerIndex c1 = ct.Previous(opp_ci);
if (att.mapped_index(mesh.CornerToPointId(c0)) !=
att.mapped_index(mesh.CornerToPointId(c1))) {
return true;
}
c0 = ct.Previous(ci);
c1 = ct.Next(opp_ci);
if (att.mapped_index(mesh.CornerToPointId(c0)) !=
att.mapped_index(mesh.CornerToPointId(c1))) {
return true;
}
return false;
}
// Interpolates an attribute value on a face using given barycentric
// coordinates. InterpolatedVectorT should be a VectorD that corresponds to the
// values stored in the attribute.
template <typename InterpolatedVectorT>
InterpolatedVectorT ComputeInterpolatedAttributeValueOnMeshFace(
const Mesh &mesh, const PointAttribute &attribute, FaceIndex fi,
const std::array<float, 3> &barycentric_coord) {
const Mesh::Face &face = mesh.face(fi);
// Get values for all three corners of the face.
InterpolatedVectorT val[3];
for (int c = 0; c < 3; ++c) {
attribute.GetMappedValue(face[c], &(val[c][0]));
}
// Return an interpolated value.
InterpolatedVectorT res;
for (int d = 0; d < InterpolatedVectorT::dimension; ++d) {
const float interpolated_component = barycentric_coord[0] * val[0][d] +
barycentric_coord[1] * val[1][d] +
barycentric_coord[2] * val[2][d];
if (std::is_integral<typename InterpolatedVectorT::Scalar>::value) {
res[d] = std::floor(interpolated_component + 0.5f);
} else {
res[d] = interpolated_component;
}
}
return res;
}
} // namespace draco
#endif // DRACO_MESH_MESH_MISC_FUNCTIONS_H_
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