Intrepid2_DerivedBasis_HGRAD_QUAD.hpp

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#ifndef Intrepid2_DerivedBasis_HGRAD_QUAD_h
#define Intrepid2_DerivedBasis_HGRAD_QUAD_h
 
#include "Intrepid2_TensorBasis.hpp"
 
namespace Intrepid2
{
  template<class HGRAD_LINE>
  class Basis_Derived_HGRAD_QUAD
  : public Basis_TensorBasis<typename HGRAD_LINE::BasisBase>
  {
  protected:
    std::string name_;
    ordinal_type order_x_, order_y_;
    EPointType pointType_;
  public:
    using ExecutionSpace  = typename HGRAD_LINE::ExecutionSpace;
    using OutputValueType = typename HGRAD_LINE::OutputValueType;
    using PointValueType  = typename HGRAD_LINE::PointValueType;
    
    using OutputViewType = typename HGRAD_LINE::OutputViewType;
    using PointViewType  = typename HGRAD_LINE::PointViewType ;
    using ScalarViewType = typename HGRAD_LINE::ScalarViewType;
    
    using BasisBase = typename HGRAD_LINE::BasisBase;
    using LineBasis = HGRAD_LINE;
    using TensorBasis = Basis_TensorBasis<BasisBase>;
 
    Basis_Derived_HGRAD_QUAD(int polyOrder_x, int polyOrder_y, const EPointType pointType=POINTTYPE_DEFAULT)
    :
    TensorBasis(Teuchos::rcp( new LineBasis(polyOrder_x, pointType)),
                Teuchos::rcp( new LineBasis(polyOrder_y, pointType)))
    {
      this->functionSpace_ = FUNCTION_SPACE_HGRAD;
 
      std::ostringstream basisName;
      basisName << "HGRAD_QUAD (" << this->TensorBasis::getName() << ")";
      name_ = basisName.str();
 
      order_x_= polyOrder_x;
      order_y_ = polyOrder_x;
      pointType_ = pointType;
    }
 
    Basis_Derived_HGRAD_QUAD(int polyOrder, const EPointType pointType=POINTTYPE_DEFAULT) : Basis_Derived_HGRAD_QUAD(polyOrder,polyOrder,pointType) {}
 
 
    virtual bool requireOrientation() const override {
      return (this->getDofCount(1,0) > 1); //if it has more than 1 DOF per edge, than it needs orientations
    }
    
    virtual OperatorTensorDecomposition getSimpleOperatorDecomposition(const EOperator operatorType) const override
    {
      const EOperator VALUE = Intrepid2::OPERATOR_VALUE;
      const EOperator GRAD  = Intrepid2::OPERATOR_GRAD;
      
      if (operatorType == VALUE)
      {
        return OperatorTensorDecomposition(Intrepid2::OPERATOR_VALUE,Intrepid2::OPERATOR_VALUE);
      }
      else if (operatorType == GRAD)
      {
        // to evaluate gradient, we need both OP_VALUE and OP_GRAD (thanks to product rule)
        // for 1D line x line, we will put derivative * value in first component, and value * derivative in second
        
        std::vector< std::vector<EOperator> > ops;
        ops.push_back(std::vector<EOperator>{GRAD,  VALUE});
        ops.push_back(std::vector<EOperator>{VALUE, GRAD});
        
        std::vector<double> weights(ops.size(), 1.0);
        
        return OperatorTensorDecomposition(ops, weights);
      }
      else
      {
        INTREPID2_TEST_FOR_EXCEPTION(true,std::invalid_argument,"operator not yet supported");
      }
    }
    
    using BasisBase::getValues;
 
    virtual void getValues(OutputViewType outputValues, const EOperator operatorType,
                           const PointViewType  inputPoints1, const PointViewType  inputPoints2,
                           bool tensorPoints) const override
    {
      Intrepid2::EOperator op1, op2;
      if (operatorType == Intrepid2::OPERATOR_VALUE)
      {
        op1 = Intrepid2::OPERATOR_VALUE;
        op2 = Intrepid2::OPERATOR_VALUE;
        
        this->TensorBasis::getValues(outputValues,
                                     inputPoints1, op1,
                                     inputPoints2, op2, tensorPoints);
      }
      else if (operatorType == Intrepid2::OPERATOR_GRAD)
      {
        // to evaluate gradient, we actually need both OP_VALUE and OP_GRAD (thanks to product rule)
        // for 1D line x line, we will put derivative * value in first component, and value * derivative in second
        
        // outputValues1 and outputValues2 are computed by basis1 and basis2 -- these are tensorial components
        // outputValuesComponent1 is a slice of the final output container (similarly, outputValuesComponent2)
        // when the component basis is 1D, it expects not to have a "dimension" component in the output container
        // the int argument in the dimension component creates a subview that skips the dimension component; the std::pair argument retains it
        auto outputValuesComponent1 = Kokkos::subview(outputValues,Kokkos::ALL(),Kokkos::ALL(),0);
        auto outputValuesComponent2 = Kokkos::subview(outputValues,Kokkos::ALL(),Kokkos::ALL(),1);
        
        // compute first component -- derivative happens in x, and value taken in y
        op1 = Intrepid2::OPERATOR_GRAD;
        op2 = Intrepid2::OPERATOR_VALUE;
        
        this->TensorBasis::getValues(outputValuesComponent1,
                                     inputPoints1, op1,
                                     inputPoints2, op2, tensorPoints);
        
        // second component -- value in x, derivative in y
        op1 = Intrepid2::OPERATOR_VALUE;
        op2 = Intrepid2::OPERATOR_GRAD;
        
        this->TensorBasis::getValues(outputValuesComponent2,
                                     inputPoints1, op1,
                                     inputPoints2, op2, tensorPoints);
      }
      else
      {
        INTREPID2_TEST_FOR_EXCEPTION(true,std::invalid_argument,"operator not yet supported");
      }
    }
                             
 
    virtual
    const char*
    getName() const override {
      return name_.c_str();
    }
 
    Teuchos::RCP<BasisBase>
      getSubCellRefBasis(const ordinal_type subCellDim, const ordinal_type subCellOrd) const override{
      if(subCellDim == 1) {
        switch(subCellOrd) {
        case 0:
        case 2:
          return Teuchos::rcp( new LineBasis(order_x_, pointType_) );
        case 1:
        case 3:
          return Teuchos::rcp( new LineBasis(order_y_, pointType_) );
        }
      }
 
      INTREPID2_TEST_FOR_EXCEPTION(true,std::invalid_argument,"Input parameters out of bounds");
    }
    
    virtual HostBasisPtr<OutputValueType, PointValueType>
    getHostBasis() const override {
      using HostBasis  = Basis_Derived_HGRAD_QUAD<typename HGRAD_LINE::HostBasis>;
      
      auto hostBasis = Teuchos::rcp(new HostBasis(order_x_, order_y_, pointType_));
      
      return hostBasis;
    }
  };
} // end namespace Intrepid2
 
#endif /* Intrepid2_DerivedBasis_HGRAD_QUAD_h */