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/* This file is part of the OpenLB library
*
* Copyright (C) 2017 Adrian Kummerlaender
* E-mail contact: info@openlb.net
* The most recent release of OpenLB can be downloaded at
* <http://www.openlb.net/>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef LATTICE_INTEGRAL_COMMON_H
#define LATTICE_INTEGRAL_COMMON_H
namespace olb {
/// Lp norm functor implementation details specific to the P parameter
/**
* Used in BlockLpNorm2D, BlockLpNorm3D, SuperLpNorm2D and SuperLpNorm3D.
**/
template <typename T, typename W, int P>
struct LpNormImpl {
inline W operator()(W output, W tmp, T weight);
inline W enclose(W output);
};
template <typename T, typename W, int P>
inline W LpNormImpl<T,W,P>::operator()(W output, W tmp, T weight)
{
return output + pow(fabs(tmp), P)*weight;
}
template <typename T, typename W, int P>
inline W LpNormImpl<T,W,P>::enclose(W output)
{
return pow(output, 1. / P);
}
/// Linf norm functor implementation details
template <typename T, typename W>
struct LpNormImpl<T,W,0> {
inline W operator()(W output, W tmp, T weight)
{
return std::max(output, fabs(tmp));
}
inline W enclose(W output)
{
return output;
}
};
/// L1 norm functor implementation details
template <typename T, typename W>
struct LpNormImpl<T,W,1> {
inline W operator()(W output, W tmp, T weight)
{
return output + fabs(tmp)*weight;
}
inline W enclose(W output)
{
return output;
}
};
/// L2 norm functor implementation details
template <typename T, typename W>
struct LpNormImpl<T,W,2> {
inline W operator()(W output, W tmp, T weight)
{
return output + tmp*tmp*weight;
}
inline W enclose(W output)
{
return sqrt(output);
}
};
} // end namespace olb
#endif
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