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70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
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/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/Stencil.cc
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#include "Grid.h"
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namespace Grid {
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void Gather_plane_simple_table_compute (GridBase *grid,int dimension,int plane,int cbmask,
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int off,std::vector<std::pair<int,int> > & table)
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{
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table.resize(0);
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int rd = grid->_rdimensions[dimension];
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if ( !grid->CheckerBoarded(dimension) ) {
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cbmask = 0x3;
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}
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int so= plane*grid->_ostride[dimension]; // base offset for start of plane
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int e1=grid->_slice_nblock[dimension];
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int e2=grid->_slice_block[dimension];
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int stride=grid->_slice_stride[dimension];
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if ( cbmask == 0x3 ) {
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table.resize(e1*e2);
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for(int n=0;n<e1;n++){
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for(int b=0;b<e2;b++){
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int o = n*stride;
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int bo = n*e2;
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table[bo+b]=std::pair<int,int>(bo+b,o+b);
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}
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}
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} else {
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int bo=0;
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table.resize(e1*e2/2);
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for(int n=0;n<e1;n++){
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for(int b=0;b<e2;b++){
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int o = n*stride;
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int ocb=1<<grid->CheckerBoardFromOindexTable(o+b);
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if ( ocb &cbmask ) {
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table[bo]=std::pair<int,int>(bo,o+b); bo++;
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}
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}
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}
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}
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}
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}
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