cuda/FFT.h

#ifndef PRDC_CUDA_FFT_H
#define PRDC_CUDA_FFT_H
 
/*
* PSCF Package 
*
* Copyright 2016 - 2022, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/
 
#include "RField.h"
#include "CField.h"
#include "RFieldDft.h"
#include "types.h"
 
#include <pscf/math/IntVec.h>
#include <util/global.h>
 
#include <cufft.h>
 
namespace Pscf {
namespace Prdc {
namespace Cuda {
 
   using namespace Util;
   using namespace Pscf;
 
   template <int D>
   class FFT 
   {
 
   public:
 
      FFT();
 
      virtual ~FFT();
 
      void setup(IntVec<D> const & meshDimensions);
 
      // Real <-> Complex transforms
      
      void forwardTransform(RField<D> const & rField, RFieldDft<D>& kField) 
      const;
 
      void inverseTransformUnsafe(RFieldDft<D>& kField, RField<D>& rField) 
      const;
 
      void inverseTransformSafe(RFieldDft<D> const & kField, 
                                RField<D>& rField) const;
 
      // Complex <-> Complex transforms
      
      void forwardTransform(CField<D> const & rField, CField<D>& kField) 
      const;
 
      void inverseTransform(CField<D> const & kField, CField<D>& rField) 
      const;
 
      const IntVec<D>& meshDimensions() const;
 
      bool isSetup() const;
 
   private:
 
      IntVec<D> meshDimensions_;
 
      mutable RFieldDft<D> kFieldCopy_;
 
      int rSize_;
 
      int kSize_;
 
      cufftHandle rcfPlan_;
 
      cufftHandle criPlan_;
 
      cufftHandle ccPlan_;
 
      bool isSetup_;
 
      void makePlans();
 
   };
 
   // Declarations of explicit specializations
 
   template <>
   void FFT<1>::makePlans();
 
   template <>
   void FFT<2>::makePlans();
 
   template <>
   void FFT<3>::makePlans();
 
   // Return the dimensions of the grid for which this was allocated.
   template <int D>
   inline IntVec<D> const & FFT<D>::meshDimensions() const
   {  return meshDimensions_; }
 
   // Has this FFT object been setup? 
   template <int D>
   inline bool FFT<D>::isSetup() const
   { return isSetup_; }
 
   #ifndef PRDC_CUDA_FFT_TPP
   // Suppress implicit instantiation
   extern template class FFT<1>;
   extern template class FFT<2>;
   extern template class FFT<3>;
   #endif
 
}
}
}
#endif