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The Dirichlet BC filter

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Peter Boyle 2021-05-11 13:55:27 -04:00
parent 791d0ab0b5
commit bf034ce239
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Grid/qcd/action/momentum/DirichletFilter.h Normal file
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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/action/momentum/DirichletFilter.h
Copyright (C) 2021
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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.
See the full license in the file "LICENSE" in the top level distribution
directory
*************************************************************************************/
/* END LEGAL */
////////////////////////////////////////////////////
// Dirichlet filter with sub-block size B[mu]
////////////////////////////////////////////////////
#pragma once
NAMESPACE_BEGIN(Grid);
template<typename MomentaField>
struct DirichletFilter: public MomentumFilterBase<MomentaField>
{
typedef typename MomentaField::vector_type vector_type; //SIMD-vectorized complex type
typedef typename MomentaField::scalar_type scalar_type; //scalar complex type
typedef iScalar<iScalar<iScalar<vector_type> > > ScalarType; //complex phase for each site
Coordinate Block;
DirichletFilter(const Coordinate &_Block): Block(_Block){}
void applyFilter(MomentaField &P) const override
{
GridBase *grid = P.Grid();
////////////////////////////////////////////////////
// Zero strictly links crossing between domains
////////////////////////////////////////////////////
LatticeInteger coor(grid);
LatticeColourMatrix zz(grid); zz = Zero();
for(int mu=0;mu<Nd;mu++) {
// If costly could provide Grid earlier and precompute masks
LatticeCoordinate(coor,mu);
auto P_mu = PeekIndex<LorentzIndex>(P, mu);
P_mu = where(mod(coor,Block[mu])==Integer(Block[mu]-1),zz,P_mu);
PokeIndex<LorentzIndex>(P, P_mu, mu);
}
}
};
NAMESPACE_END(Grid);