Panzer_Integrator_Scalar_impl.hpp

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#ifndef PANZER_EVALUATOR_SCALAR_IMPL_HPP
#define PANZER_EVALUATOR_SCALAR_IMPL_HPP

#include "Intrepid2_FunctionSpaceTools.hpp"
#include "Panzer_IntegrationRule.hpp"
#include "Panzer_Workset_Utilities.hpp"
#include "Kokkos_ViewFactory.hpp"
#include "Phalanx_DataLayout_MDALayout.hpp"

namespace panzer {

//**********************************************************************
template<typename EvalT, typename Traits>
Integrator_Scalar<EvalT, Traits>::
Integrator_Scalar(
  const Teuchos::ParameterList& p) : quad_index(0)
{
  Teuchos::RCP<Teuchos::ParameterList> valid_params = this->getValidParameters();
  p.validateParameters(*valid_params);

  Teuchos::RCP<panzer::IntegrationRule> ir = p.get< Teuchos::RCP<panzer::IntegrationRule> >("IR");
  quad_order = ir->cubature_degree;

  Teuchos::RCP<PHX::DataLayout> dl_cell = Teuchos::rcp(new PHX::MDALayout<Cell>(ir->dl_scalar->extent(0)));
  integral = PHX::MDField<ScalarT>( p.get<std::string>("Integral Name"), dl_cell);
  scalar = PHX::MDField<const ScalarT,Cell,IP>( p.get<std::string>("Integrand Name"), ir->dl_scalar);

  this->addEvaluatedField(integral);
  this->addDependentField(scalar);
    
  multiplier = 1.0;
  if(p.isType<double>("Multiplier"))
     multiplier = p.get<double>("Multiplier");

  if (p.isType<Teuchos::RCP<const std::vector<std::string> > >("Field Multipliers")) {
    const std::vector<std::string>& field_multiplier_names = 
      *(p.get<Teuchos::RCP<const std::vector<std::string> > >("Field Multipliers"));

    for (std::vector<std::string>::const_iterator name = 
     field_multiplier_names.begin(); 
   name != field_multiplier_names.end(); ++name) {
      PHX::MDField<const ScalarT,Cell,IP> tmp_field(*name, p.get< Teuchos::RCP<panzer::IntegrationRule> >("IR")->dl_scalar);
      field_multipliers.push_back(tmp_field);
    }
  }

  for (typename std::vector<PHX::MDField<const ScalarT,Cell,IP> >::iterator field = field_multipliers.begin();
       field != field_multipliers.end(); ++field)
    this->addDependentField(*field);

  std::string n = "Integrator_Scalar: " + integral.fieldTag().name();
  this->setName(n);
}

//**********************************************************************
template<typename EvalT, typename Traits>
void
Integrator_Scalar<EvalT, Traits>::
postRegistrationSetup(
  typename Traits::SetupData sd,
  PHX::FieldManager<Traits>& /* fm */)
{
  num_qp = scalar.extent(1);
  tmp = Kokkos::createDynRankView(scalar.get_static_view(),"tmp", scalar.extent(0), num_qp);
  quad_index =  panzer::getIntegrationRuleIndex(quad_order,(*sd.worksets_)[0], this->wda);
}

//**********************************************************************
template<typename EvalT, typename Traits>
void
Integrator_Scalar<EvalT, Traits>::
evaluateFields(
  typename Traits::EvalData workset)
{ 
/*
  for (index_t cell = 0; cell < workset.num_cells; ++cell)
    integral(cell) = 0.0;
*/

  for (index_t cell = 0; cell < workset.num_cells; ++cell) {
    for (std::size_t qp = 0; qp < num_qp; ++qp) {
      tmp(cell,qp) = multiplier * scalar(cell,qp);
      for (typename std::vector<PHX::MDField<const ScalarT,Cell,IP> >::iterator field = field_multipliers.begin();
     field != field_multipliers.end(); ++field)
        tmp(cell,qp) = tmp(cell,qp) * (*field)(cell,qp);  
    }
  }

  // Switch to Kokkos means we can no longer use intrepid.  There is a
  // hard coded call to blas that grab a reference to the first
  // element. You can't grab refrerences to memory anymore with
  // kokkos.  When Intrepid2 is fixed, we can switch this back.
  /*
  if(workset.num_cells>0)
    Intrepid2::FunctionSpaceTools::
      integrate<ScalarT>(integral, tmp, 
       (this->wda(workset).int_rules[quad_index])->weighted_measure, 
       Intrepid2::COMP_CPP);
  */
  
  // NOTE: this is not portable to GPUs.  Need to remove all uses of
  // intrepid field container for MDFields.  This is rather involved
  // since we need to change the Worksets.

  // const Kokkos::DynRankView<double,PHX::Device>& rightFields = (this->wda(workset).int_rules[quad_index])->weighted_measure;
  const IntegrationValues2<double> & iv = *this->wda(workset).int_rules[quad_index];

  int numPoints       = tmp.extent(1);
 
  for(index_t cl = 0; cl < workset.num_cells; cl++) {
    integral(cl) = tmp(cl, 0)*iv.weighted_measure(cl, 0);
    for(int qp = 1; qp < numPoints; qp++)
      // integral(cl) += tmp(cl, qp)*rightFields(cl, qp);
      integral(cl) += tmp(cl, qp)*iv.weighted_measure(cl, qp);
  } // cl-loop
}

//**********************************************************************
template<typename EvalT, typename TRAITS>
Teuchos::RCP<Teuchos::ParameterList> 
Integrator_Scalar<EvalT, TRAITS>::getValidParameters() const
{
  Teuchos::RCP<Teuchos::ParameterList> p = Teuchos::rcp(new Teuchos::ParameterList);
  p->set<std::string>("Integral Name", "?");
  p->set<std::string>("Integrand Name", "?");

  Teuchos::RCP<panzer::IntegrationRule> ir;
  p->set("IR", ir);
  p->set<double>("Multiplier", 1.0);

  Teuchos::RCP<const std::vector<std::string> > fms;
  p->set("Field Multipliers", fms);
  return p;
}

//**********************************************************************

}

#endif