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/*! \internal \file
 *  \brief Declares the GPU 3D FFT routines.
 *
 *  \author Aleksei Iupinov <a.yupinov@gmail.com>
 *  \author Mark Abraham <mark.j.abraham@gmail.com>
 *  \author Gaurav Garg <gaugarg@nvidia.com>
 *  \ingroup module_fft
 */

#ifndef GMX_FFT_GPU_3DFFT_CUFFT_H
#define GMX_FFT_GPU_3DFFT_CUFFT_H

#include <cufft.h>

#include <memory>

#include "gromacs/fft/fft.h"
#include "gromacs/gpu_utils/devicebuffer_datatype.h"
#include "gromacs/gpu_utils/gputraits.h"
#include "gromacs/utility/gmxmpi.h"

#include "gpu_3dfft_impl.h"

class DeviceContext;
class DeviceStream;

namespace gmx
{

/*! \internal \brief
 * A 3D FFT wrapper class for performing R2C/C2R transforms using cuFFT
 */
class Gpu3dFft::ImplCuFft : public Gpu3dFft::Impl
{
public:
    //! \copydoc Gpu3dFft::Impl::Impl
    ImplCuFft(bool                 allocateRealGrid,
              MPI_Comm             comm,
              ArrayRef<const int>  gridSizesInXForEachRank,
              ArrayRef<const int>  gridSizesInYForEachRank,
              int                  nz,
              bool                 performOutOfPlaceFFT,
              const DeviceContext& context,
              const DeviceStream&  pmeStream,
              ivec                 realGridSize,
              ivec                 realGridSizePadded,
              ivec                 complexGridSizePadded,
              DeviceBuffer<float>* realGrid,
              DeviceBuffer<float>* complexGrid);

    //! \copydoc Gpu3dFft::Impl::~Impl
    ~ImplCuFft() override;

    //! \copydoc Gpu3dFft::Impl::perform3dFft
    void perform3dFft(gmx_fft_direction dir, CommandEvent* timingEvent) override;

private:
    cufftHandle planR2C_;
    cufftHandle planC2R_;
    cufftReal*  realGrid_;
};

} // namespace gmx

#endif
