Added laplacian operator for smearing sources

extras/Hadrons/Modules/MSource/Laplacian.hpp

@@ -0,0 +1,153 @@
+/*************************************************************************************
+
+Grid physics library, www.github.com/paboyle/Grid 
+
+Source file: extras/Hadrons/Modules/MSource/Laplacian.hpp
+
+Copyright (C) 2017
+
+Author: Guido Cossu <guido.cossu@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 */
+
+#ifndef Hadrons_MSource_Laplacian_hpp_
+#define Hadrons_MSource_Laplacian_hpp_
+
+#include <Grid/Hadrons/Global.hpp>
+#include <Grid/Hadrons/Module.hpp>
+#include <Grid/Hadrons/ModuleFactory.hpp>
+
+BEGIN_HADRONS_NAMESPACE
+
+/*
+ 
+ Laplacian smearing source
+ -----------------------------
+ 
+ * options:
+ - source: name of source object to be smeared (string)
+ - N: number of steps (integer)
+ - alpha: smearing parameter (real)
+ 
+ */
+
+/******************************************************************************
+ *                          Z2 stochastic source                              *
+ ******************************************************************************/
+BEGIN_MODULE_NAMESPACE(MSource)
+
+class LaplacianPar : Serializable
+{
+  public:
+    GRID_SERIALIZABLE_CLASS_MEMBERS(LaplacianPar,
+                                    std::string, source,
+                                    std::string, gauge,
+                                    unsigned int, N,
+                                    double, alpha);
+};
+
+template <typename FImpl>
+class TLaplacian : public Module<LaplacianPar>
+{
+  public:
+    FERM_TYPE_ALIASES(FImpl, );
+
+  public:
+    // constructor
+    TLaplacian(const std::string name);
+    // destructor
+    virtual ~TLaplacian(void) = default;
+    // dependency relation
+    virtual std::vector<std::string> getInput(void);
+    virtual std::vector<std::string> getOutput(void);
+    // setup
+    virtual void setup(void);
+    // execution
+    virtual void execute(void);
+};
+
+MODULE_REGISTER_NS(Lap, TLaplacian<FIMPL>, MSource);
+
+/******************************************************************************
+ *                       TLaplacian template implementation                         *
+ ******************************************************************************/
+// constructor /////////////////////////////////////////////////////////////////
+template <typename FImpl>
+TLaplacian<FImpl>::TLaplacian(const std::string name)
+    : Module<LaplacianPar>(name)
+{
+}
+
+// dependencies/products ///////////////////////////////////////////////////////
+template <typename FImpl>
+std::vector<std::string> TLaplacian<FImpl>::getInput(void)
+{
+    std::vector<std::string> in = {par().source, par().gauge};
+
+    return in;
+}
+
+template <typename FImpl>
+std::vector<std::string> TLaplacian<FImpl>::getOutput(void)
+{
+    std::vector<std::string> out = {getName()};
+
+    return out;
+}
+
+// setup ///////////////////////////////////////////////////////////////////////
+template <typename FImpl>
+void TLaplacian<FImpl>::setup(void)
+{
+    env().template registerLattice<PropagatorField>(getName());
+}
+
+// execution ///////////////////////////////////////////////////////////////////
+template <typename FImpl>
+void TLaplacian<FImpl>::execute(void)
+{
+
+    FermionField source(env().getGrid()), tmp(env().getGrid());
+    PropagatorField &SmrSrc = *env().template createLattice<PropagatorField>(getName());
+    PropagatorField &fullSrc = *env().template getObject<PropagatorField>(par().source);
+    auto &U      = *env().template getObject<LatticeGaugeField>(par().gauge);
+    Laplacian<FImpl> LaplaceOperator(env().getGrid());
+    LaplaceOperator.ImportGauge(U);
+    double prefactor = par().alpha / (double)(par().N);
+
+    for (unsigned int s = 0; s < Ns; ++s)
+    {
+        for (unsigned int c = 0; c < Nc; ++c)
+        {
+            PropToFerm(source, fullSrc, s, c);
+            for (int smr = 0; smr < par().N; ++smr)
+            {
+                LaplaceOperator.M(source, tmp);
+                source += prefactor * tmp;
+            }
+            FermToProp(SmrSrc, source, s, c);
+        }
+    }
+}
+
+END_MODULE_NAMESPACE
+
+END_HADRONS_NAMESPACE
+
+#endif // Hadrons_MSource_Z2_hpp_