DDHMCFilter.h

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/*************************************************************************************
 
Grid physics library, www.github.com/paboyle/Grid
 
Source file: ./lib/qcd/hmc/integrators/DirichletFilter.h
 
Copyright (C) 2015
 
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 */
//--------------------------------------------------------------------
#pragma once
 
NAMESPACE_BEGIN(Grid);
// DDHMC filter with sub-block size B[mu]
 
template<typename GaugeField>
struct DDHMCFilter: public MomentumFilterBase<GaugeField>
{
  Coordinate Block;
  int Width;
  
  DDHMCFilter(const Coordinate &_Block,int _Width=2): Block(_Block) { Width=_Width; }
 
  void applyFilter(GaugeField &U) const override
  {
    GridBase *grid = U.Grid();
    Coordinate Global=grid->GlobalDimensions();
    GaugeField zzz(grid); zzz = Zero();
    LatticeInteger coor(grid); 
    
    auto zzz_mu = PeekIndex<LorentzIndex>(zzz,0);
    // Zero BDY layers
    std::cout<<GridLogMessage<<" DDHMC Force Filter Block "<<Block<<" width " <<Width<<std::endl;
    for(int mu=0;mu<Nd;mu++) {
 
      Integer B1 = Block[mu];
      if ( B1 && (B1 <= Global[mu]) ) {
    LatticeCoordinate(coor,mu);

    // OmegaBar - zero all links contained in slice B-1,0 and
    // mu links connecting to Omega
    if ( Width==1) { 
      U    = where(mod(coor,B1)==Integer(B1-1),zzz,U);
      U    = where(mod(coor,B1)==Integer(0)   ,zzz,U); 
      auto U_mu   = PeekIndex<LorentzIndex>(U,mu);
      U_mu = where(mod(coor,B1)==Integer(B1-2),zzz_mu,U_mu); 
      PokeIndex<LorentzIndex>(U, U_mu, mu);
    }
    if ( Width==2) { 
      U    = where(mod(coor,B1)==Integer(B1-2),zzz,U);
      U    = where(mod(coor,B1)==Integer(B1-1),zzz,U);
      U    = where(mod(coor,B1)==Integer(0)   ,zzz,U); 
      U    = where(mod(coor,B1)==Integer(1)   ,zzz,U); 
      auto U_mu   = PeekIndex<LorentzIndex>(U,mu);
      U_mu = where(mod(coor,B1)==Integer(B1-3),zzz_mu,U_mu); 
      PokeIndex<LorentzIndex>(U, U_mu, mu);
    }
    if ( Width==3) { 
      U    = where(mod(coor,B1)==Integer(B1-3),zzz,U);
      U    = where(mod(coor,B1)==Integer(B1-2),zzz,U);
      U    = where(mod(coor,B1)==Integer(B1-1),zzz,U);
      U    = where(mod(coor,B1)==Integer(0)   ,zzz,U); 
      U    = where(mod(coor,B1)==Integer(1)   ,zzz,U); 
      U    = where(mod(coor,B1)==Integer(2)   ,zzz,U); 
      auto U_mu   = PeekIndex<LorentzIndex>(U,mu);
      U_mu = where(mod(coor,B1)==Integer(B1-4),zzz_mu,U_mu); 
      PokeIndex<LorentzIndex>(U, U_mu, mu);
    }
    if ( Width==4) { 
      U    = where(mod(coor,B1)==Integer(B1-4),zzz,U);
      U    = where(mod(coor,B1)==Integer(B1-3),zzz,U);
      U    = where(mod(coor,B1)==Integer(B1-2),zzz,U);
      U    = where(mod(coor,B1)==Integer(B1-1),zzz,U);
      U    = where(mod(coor,B1)==Integer(0)   ,zzz,U); 
      U    = where(mod(coor,B1)==Integer(1)   ,zzz,U); 
      U    = where(mod(coor,B1)==Integer(2)   ,zzz,U); 
      U    = where(mod(coor,B1)==Integer(3)   ,zzz,U); 
      auto U_mu   = PeekIndex<LorentzIndex>(U,mu);
      U_mu = where(mod(coor,B1)==Integer(B1-5),zzz_mu,U_mu); 
      PokeIndex<LorentzIndex>(U, U_mu, mu);
    }
      }
 
    }
   
  }
};
 
NAMESPACE_END(Grid);