mapping_data_on_the_fly.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2014 - 2016 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------


#ifndef dealii__matrix_free_mapping_data_on_the_fly_h
#define dealii__matrix_free_mapping_data_on_the_fly_h


#include <deal.II/base/config.h>
#include <deal.II/base/exceptions.h>
#include <deal.II/base/subscriptor.h>
#include <deal.II/base/vectorization.h>
#include <deal.II/base/aligned_vector.h>
#include <deal.II/matrix_free/shape_info.h>
#include <deal.II/matrix_free/mapping_info.h>
#include <deal.II/fe/fe_values.h>
#include <deal.II/fe/fe_nothing.h>


DEAL_II_NAMESPACE_OPEN


namespace internal
{
  namespace MatrixFreeFunctions
  {
    template <int dim, typename Number=double>
    class MappingDataOnTheFly
    {
    public:
      MappingDataOnTheFly (const Mapping<dim> &mapping,
                           const Quadrature<1> &quadrature,
                           const UpdateFlags update_flags);

      MappingDataOnTheFly (const Quadrature<1> &quadrature,
                           const UpdateFlags update_flags);

      void reinit(typename ::Triangulation<dim>::cell_iterator cell);

      bool is_initialized() const;

      typename ::Triangulation<dim>::cell_iterator get_cell () const;

      const ::FEValues<dim> &get_fe_values () const;

      const AlignedVector<Tensor<2,dim,VectorizedArray<Number> > > &
      get_inverse_jacobians() const;

      const AlignedVector<VectorizedArray<Number> > &
      get_JxW_values() const;

      const AlignedVector<Point<dim,VectorizedArray<Number> > > &
      get_quadrature_points() const;

      const AlignedVector<Tensor<1,dim,VectorizedArray<Number> > > &
      get_normal_vectors() const;

      const Quadrature<1> &
      get_quadrature () const;

    private:
      typename ::Triangulation<dim>::cell_iterator present_cell;

      FE_Nothing<dim> fe_dummy;

      ::FEValues<dim> fe_values;

      const Quadrature<1> quadrature_1d;

      AlignedVector<Tensor<2,dim,VectorizedArray<Number> > > inverse_jacobians;

      AlignedVector<VectorizedArray<Number> > jxw_values;

      AlignedVector<Point<dim,VectorizedArray<Number> > > quadrature_points;

      AlignedVector<Tensor<1,dim,VectorizedArray<Number> > > normal_vectors;
    };


    /*----------------------- Inline functions ----------------------------------*/

    template <int dim, typename Number>
    inline
    MappingDataOnTheFly<dim,Number>::MappingDataOnTheFly (const Mapping<dim> &mapping,
                                                          const Quadrature<1> &quadrature,
                                                          const UpdateFlags update_flags)
      :
      fe_values(mapping, fe_dummy, Quadrature<dim>(quadrature),
                internal::MatrixFreeFunctions::MappingInfo<dim,Number>::compute_update_flags(update_flags)),
      quadrature_1d(quadrature),
      inverse_jacobians(fe_values.get_quadrature().size()),
      jxw_values(fe_values.get_quadrature().size()),
      quadrature_points(fe_values.get_quadrature().size()),
      normal_vectors(fe_values.get_quadrature().size())
    {
      Assert(!(fe_values.get_update_flags() & update_jacobian_grads),
             ExcNotImplemented());
    }



    template <int dim, typename Number>
    inline
    MappingDataOnTheFly<dim,Number>::MappingDataOnTheFly (const Quadrature<1> &quadrature,
                                                          const UpdateFlags update_flags)
      :
      fe_values(fe_dummy, Quadrature<dim>(quadrature),
                internal::MatrixFreeFunctions::MappingInfo<dim,Number>::compute_update_flags(update_flags)),
      quadrature_1d(quadrature),
      inverse_jacobians(fe_values.get_quadrature().size()),
      jxw_values(fe_values.get_quadrature().size()),
      quadrature_points(fe_values.get_quadrature().size()),
      normal_vectors(fe_values.get_quadrature().size())
    {
      Assert(!(fe_values.get_update_flags() & update_jacobian_grads),
             ExcNotImplemented());
    }



    template <int dim, typename Number>
    inline
    void
    MappingDataOnTheFly<dim,Number>::reinit(typename ::Triangulation<dim>::cell_iterator cell)
    {
      if (present_cell == cell)
        return;
      present_cell = cell;
      fe_values.reinit(present_cell);
      for (unsigned int q=0; q<fe_values.get_quadrature().size(); ++q)
        {
          if (fe_values.get_update_flags() & update_inverse_jacobians)
            for (unsigned int d=0; d<dim; ++d)
              for (unsigned int e=0; e<dim; ++e)
                inverse_jacobians[q][d][e] = fe_values.inverse_jacobian(q)[e][d];
          if (fe_values.get_update_flags() & update_quadrature_points)
            for (unsigned int d=0; d<dim; ++d)
              quadrature_points[q][d] = fe_values.quadrature_point(q)[d];
          if (fe_values.get_update_flags() & update_normal_vectors)
            for (unsigned int d=0; d<dim; ++d)
              normal_vectors[q][d] = fe_values.normal_vector(q)[d];
          if (fe_values.get_update_flags() & update_JxW_values)
            jxw_values[q] = fe_values.JxW(q);
        }
    }



    template <int dim, typename Number>
    inline
    bool
    MappingDataOnTheFly<dim,Number>::is_initialized() const
    {
      return present_cell != typename ::Triangulation<dim>::cell_iterator();
    }



    template <int dim, typename Number>
    inline
    typename ::Triangulation<dim>::cell_iterator
    MappingDataOnTheFly<dim,Number>::get_cell() const
    {
      return fe_values.get_cell();
    }



    template <int dim, typename Number>
    inline
    const ::FEValues<dim> &
    MappingDataOnTheFly<dim,Number>::get_fe_values() const
    {
      return fe_values;
    }



    template <int dim, typename Number>
    inline
    const AlignedVector<Tensor<2,dim,VectorizedArray<Number> > > &
    MappingDataOnTheFly<dim,Number>::get_inverse_jacobians() const
    {
      return inverse_jacobians;
    }



    template <int dim, typename Number>
    inline
    const AlignedVector<Tensor<1,dim,VectorizedArray<Number> > > &
    MappingDataOnTheFly<dim,Number>::get_normal_vectors() const
    {
      return normal_vectors;
    }



    template <int dim, typename Number>
    inline
    const AlignedVector<Point<dim,VectorizedArray<Number> > > &
    MappingDataOnTheFly<dim,Number>::get_quadrature_points() const
    {
      return quadrature_points;
    }



    template <int dim, typename Number>
    inline
    const AlignedVector<VectorizedArray<Number> > &
    MappingDataOnTheFly<dim,Number>::get_JxW_values() const
    {
      return jxw_values;
    }



    template <int dim, typename Number>
    inline
    const Quadrature<1> &
    MappingDataOnTheFly<dim,Number>::get_quadrature() const
    {
      return quadrature_1d;
    }


  } // end of namespace MatrixFreeFunctions
} // end of namespace internal


DEAL_II_NAMESPACE_CLOSE

#endif