KokkosReaction.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include "KokkosKernel.h"

class KokkosReaction : public Moose::Kokkos::Kernel
{
public:
  static InputParameters validParams();

  KokkosReaction(const InputParameters & parameters);

  template <typename Derived>
  KOKKOS_FUNCTION Real computeQpResidual(const unsigned int i,
                                         const unsigned int qp,
                                         AssemblyDatum & datum) const;
  template <typename Derived>
  KOKKOS_FUNCTION Real computeQpJacobian(const unsigned int i,
                                         const unsigned int j,
                                         const unsigned int qp,
                                         AssemblyDatum & datum) const;

protected:
  const Moose::Kokkos::Scalar<const Real> _rate;
};

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosReaction::computeQpResidual(const unsigned int i,
                                  const unsigned int qp,
                                  AssemblyDatum & datum) const
{
  return _test(datum, i, qp) * _rate * _u(datum, qp);
}

template <typename Derived>
KOKKOS_FUNCTION Real
KokkosReaction::computeQpJacobian(const unsigned int i,
                                  const unsigned int j,
                                  const unsigned int qp,
                                  AssemblyDatum & datum) const
{
  return _test(datum, i, qp) * _rate * _phi(datum, j, qp);
}