petsc_dm_wrapper.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2018 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library 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
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef LIBMESH_PETSC_DM_WRAPPER_H
#define LIBMESH_PETSC_DM_WRAPPER_H

#include "libmesh/libmesh_common.h"

#ifdef LIBMESH_HAVE_PETSC

#include <vector>
#include <memory>
#include <unordered_map>
#include <map>

// PETSc includes
#include "libmesh/ignore_warnings.h"
#include <petsc.h>
#include "libmesh/restore_warnings.h"

namespace libMesh
{
  // Forward declarations
  class System;
  class DofObject;

class PetscDMWrapper
{
public:

  PetscDMWrapper() = default;

  ~PetscDMWrapper();

  void clear();

  void init_and_attach_petscdm(System & system, SNES & snes);

private:

  std::vector<std::unique_ptr<DM>> _dms;

  std::vector<std::unique_ptr<PetscSection>> _sections;

  std::vector<std::unique_ptr<PetscSF>> _star_forests;

  void init_dm_data(unsigned int n_levels);


  DM & get_dm(unsigned int level)
  { libmesh_assert(level < _dms.size());
    return *(_dms[level].get()); }


  PetscSection & get_section(unsigned int level)
  { libmesh_assert(level < _sections.size());
    return *(_sections[level].get()); }


  PetscSF & get_star_forest(unsigned int level)
  { libmesh_assert(level < _star_forests.size());
    return *(_star_forests[level].get()); }


  void build_section(const System & system, PetscSection & section);


  void build_sf( const System & system, PetscSF & star_forest );


  void set_point_range_in_section( const System & system,
                                   PetscSection & section,
                                   std::unordered_map<dof_id_type,dof_id_type> & node_map,
                                   std::unordered_map<dof_id_type,dof_id_type> & elem_map,
                                   std::map<dof_id_type,unsigned int> & scalar_map);


  void add_dofs_to_section (const System & system,
                            PetscSection & section,
                            const std::unordered_map<dof_id_type,dof_id_type> & node_map,
                            const std::unordered_map<dof_id_type,dof_id_type> & elem_map,
                            const std::map<dof_id_type,unsigned int> & scalar_map);


  dof_id_type check_section_n_dofs( const System & system, PetscSection & section );

  void add_dofs_helper (const System & system,
                        const DofObject & dof_object,
                        dof_id_type local_id,
                        PetscSection & section);

};

}

#endif // #ifdef LIBMESH_HAVE_PETSC

#endif // LIBMESH_PETSC_DM_WRAPPER_H