MPIInterpolator.h

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/***************************************************************************
 *  ThunderEgg, a library for solvers on adaptively refined block-structured
 *  Cartesian grids.
 *
 *  Copyright (c) 2020-2021 Scott Aiton
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 ***************************************************************************/
 
#ifndef THUNDEREGG_GMG_MPIINTERPOLATOR_H
#define THUNDEREGG_GMG_MPIINTERPOLATOR_H
 
#include <ThunderEgg/Domain.h>
#include <ThunderEgg/GMG/InterLevelComm.h>
#include <ThunderEgg/GMG/Interpolator.h>
#include <ThunderEgg/GMG/Level.h>
namespace ThunderEgg::GMG {
template<int D>
class MPIInterpolator : public Interpolator<D>
{
private:
  mutable InterLevelComm<D> ilc;
 
public:
  MPIInterpolator(const Domain<D>& coarser_domain, const Domain<D>& finer_domain)
    : ilc(coarser_domain, finer_domain)
  {}
  virtual void interpolatePatches(
    const std::vector<std::pair<int, std::reference_wrapper<const PatchInfo<D>>>>& patches,
    const Vector<D>& coarser_vector,
    Vector<D>& finer_vector) const = 0;
 
  void interpolate(const Vector<D>& coarse, Vector<D>& fine) const
  {
    if constexpr (ENABLE_DEBUG) {
      if (coarse.getNumLocalPatches() != ilc.getCoarserDomain().getNumLocalPatches()) {
        throw RuntimeError("coarse vector is incorrect length. Expected Length of " +
                           std::to_string(ilc.getCoarserDomain().getNumLocalPatches()) +
                           " but vector was length " + std::to_string(coarse.getNumLocalPatches()));
      }
      if (fine.getNumLocalPatches() != ilc.getFinerDomain().getNumLocalPatches()) {
        throw RuntimeError("fine vector is incorrect length. Expected Length of " +
                           std::to_string(ilc.getFinerDomain().getNumLocalPatches()) +
                           " but vector was length " + std::to_string(fine.getNumLocalPatches()));
      }
    }
    Vector<D> coarse_ghost = ilc.getNewGhostVector(coarse.getNumComponents());
 
    // start scatter for ghost values
    ilc.getGhostPatchesStart(coarse, coarse_ghost);
 
    // interpolate form local values
    interpolatePatches(ilc.getPatchesWithLocalParent(), coarse, fine);
 
    // finish scatter for ghost values
    ilc.getGhostPatchesFinish(coarse, coarse_ghost);
 
    // interpolator from ghost values
    interpolatePatches(ilc.getPatchesWithGhostParent(), coarse_ghost, fine);
  }
};
} // namespace ThunderEgg::GMG
// explicit instantiation
extern template class ThunderEgg::GMG::MPIInterpolator<2>;
extern template class ThunderEgg::GMG::MPIInterpolator<3>;
#endif