// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2020 Alec Jacobson <alecjacobson@gmail.com>
// 
// This Source Code Form is subject to the terms of the Mozilla Public License 
// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
// obtain one at http://mozilla.org/MPL/2.0/.
#include "barycentric_interpolation.h"
#include "parallel_for.h"

template <
  typename DerivedD,
  typename DerivedF,
  typename DerivedB,
  typename DerivedI,
  typename DerivedX>
IGL_INLINE void igl::barycentric_interpolation(
  const Eigen::MatrixBase<DerivedD> & D,
  const Eigen::MatrixBase<DerivedF> & F,
  const Eigen::MatrixBase<DerivedB> & B,
  const Eigen::MatrixBase<DerivedI> & I,
  Eigen::PlainObjectBase<DerivedX> & X)
{
  assert(B.rows() == I.size());
  assert(F.cols() == B.cols());
  X.setZero(B.rows(),D.cols());
  // should use parallel_for
  //for(int i = 0;i<X.rows();i++)
  parallel_for(X.rows(),[&X,&B,&D,&F,&I](const int i)
  {
    for(int j = 0;j<F.cols();j++)
    {
      X.row(i) += B(i,j) * D.row(F(I(i),j));
    }
  },1000);
}

#ifdef IGL_STATIC_LIBRARY
// Explicit template instantiation
// generated by autoexplicit.sh
template void igl::barycentric_interpolation<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, 1, 0, -1, 1>, Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::MatrixBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
#endif