Panzer_ProjectToEdges_impl.hpp

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#ifndef PANZER_PROJECT_TO_EDGES_IMPL_HPP
#define PANZER_PROJECT_TO_EDGES_IMPL_HPP

#include "Teuchos_Assert.hpp"
#include "Phalanx_DataLayout.hpp"

#include "Intrepid2_Cubature.hpp"
#include "Intrepid2_DefaultCubatureFactory.hpp"
#include "Intrepid2_FunctionSpaceTools.hpp"
#include "Intrepid2_OrientationTools.hpp"

#include "Panzer_PureBasis.hpp"
#include "Panzer_CommonArrayFactories.hpp"
#include "Panzer_HierarchicParallelism.hpp"
#include "Kokkos_ViewFactory.hpp"

#include "Teuchos_FancyOStream.hpp"

template<typename EvalT,typename Traits>
panzer::ProjectToEdges<EvalT, Traits>::
ProjectToEdges(
  const Teuchos::ParameterList& p)
{ 
  dof_name_ = (p.get< std::string >("DOF Name"));

  if(p.isType< Teuchos::RCP<PureBasis> >("Basis"))
    basis_ = p.get< Teuchos::RCP<PureBasis> >("Basis");
  else
    basis_ = p.get< Teuchos::RCP<const PureBasis> >("Basis");

  Teuchos::RCP<PHX::DataLayout> basis_layout  = basis_->functional;
  Teuchos::RCP<PHX::DataLayout> vector_layout = basis_->functional_grad;

  // some sanity checks
  TEUCHOS_ASSERT(basis_->isVectorBasis());

  result_ = PHX::MDField<ScalarT,Cell,BASIS>(dof_name_,basis_layout);
  this->addEvaluatedField(result_);

  tangents_ = PHX::MDField<const ScalarT,Cell,BASIS,Dim>(dof_name_+"_Tangents",vector_layout);
  this->addDependentField(tangents_);

  vector_values_ = PHX::MDField<const ScalarT,Cell,BASIS,Dim>(dof_name_+"_Vector",vector_layout);
  this->addDependentField(vector_values_);

  this->setName("Project To Edges");
}

// **********************************************************************
template<typename EvalT,typename Traits>
void panzer::ProjectToEdges<EvalT, Traits>::
postRegistrationSetup(typename Traits::SetupData  d, 
          PHX::FieldManager<Traits>& /* fm */)
{
  num_edges_ = vector_values_.extent(1);
  num_dim_ = vector_values_.extent(2);

  TEUCHOS_ASSERT(vector_values_.extent(1) == tangents_.extent(1));
  TEUCHOS_ASSERT(vector_values_.extent(2) == tangents_.extent(2));
}

// **********************************************************************
template<typename EvalT,typename Traits>
void panzer::ProjectToEdges<EvalT, Traits>::
evaluateFields(typename Traits::EvalData workset)
{ 
  // Restricting HCurl field, multiplied by the tangent to the edge, into HVol on the edges.
  // This code assumes affine mapping and the projection into 1 quadrature point for each edge,
  // which is identified with the edge. This makes sense only for low order bases, for which
  // HVol is constant

  //TODO: make this work w/ high order basis
  const int intDegree = basis_->order();
  TEUCHOS_ASSERT(intDegree == 1);

  auto result = result_.get_static_view();
  auto vector_values = vector_values_.get_static_view();
  auto tangents = tangents_.get_static_view();
  auto num_edges = num_edges_;
  auto num_dim = num_dim_;

  auto policy = panzer::HP::inst().teamPolicy<ScalarT,PHX::exec_space>(workset.num_cells);
  Kokkos::parallel_for("panzer::ProjectToEdges",policy,KOKKOS_LAMBDA(const Kokkos::TeamPolicy<PHX::exec_space>::member_type& team) {
    const auto cell = team.league_rank();
    Kokkos::parallel_for(Kokkos::TeamThreadRange(team,0,num_edges),[&] (const int p) {
      result(cell,p) = ScalarT(0.0);
      for (int dim = 0; dim < num_dim; ++dim)
        result(cell,p) += vector_values(cell,p,dim) * tangents(cell,p,dim);
    });
  });
}

#endif