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/* Copyright 2019 David Grote, Maxence Thevenet, Remi Lehe
* Revathi Jambunathan
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef WARPX_SPECTRAL_FIELD_DATA_H_
#define WARPX_SPECTRAL_FIELD_DATA_H_
#include <WarpX_ComplexForFFT.H>
#include <SpectralKSpace.H>
#include <AMReX_MultiFab.H>
// Declare type for spectral fields
using SpectralField = amrex::FabArray< amrex::BaseFab <Complex> >;
/** Index for the regular fields, when stored in spectral space */
struct SpectralFieldIndex {
enum { Ex=0, Ey, Ez, Bx, By, Bz, Jx, Jy, Jz, rho_old, rho_new, n_fields };
// n_fields is automatically the total number of fields
};
/** Index for the PML fields, when stored in spectral space */
struct SpectralPMLIndex {
enum { Exy=0, Exz, Eyx, Eyz, Ezx, Ezy,
Bxy, Bxz, Byx, Byz, Bzx, Bzy, n_fields };
// n_fields is automatically the total number of fields
};
/** \brief Class that stores the fields in spectral space, and performs the
* Fourier transforms between real space and spectral space
*/
class SpectralFieldData
{
// Define the FFTplans type, which holds one fft plan per box
// (plans are only initialized for the boxes that are owned by
// the local MPI rank)
#ifdef AMREX_USE_GPU
using FFTplans = amrex::LayoutData<cufftHandle>;
#else
using FFTplans = amrex::LayoutData<fftw_plan>;
#endif
public:
SpectralFieldData( const amrex::BoxArray& realspace_ba,
const SpectralKSpace& k_space,
const amrex::DistributionMapping& dm,
const int n_field_required );
SpectralFieldData() = default; // Default constructor
SpectralFieldData& operator=(SpectralFieldData&& field_data) = default;
~SpectralFieldData();
void ForwardTransform( const amrex::MultiFab& mf,
const int field_index, const int i_comp);
void BackwardTransform( amrex::MultiFab& mf,
const int field_index, const int i_comp);
// `fields` stores fields in spectral space, as multicomponent FabArray
SpectralField fields;
private:
// tmpRealField and tmpSpectralField store fields
// right before/after the Fourier transform
SpectralField tmpSpectralField; // contains Complexs
amrex::MultiFab tmpRealField; // contains Reals
FFTplans forward_plan, backward_plan;
// Correcting "shift" factors when performing FFT from/to
// a cell-centered grid in real space, instead of a nodal grid
SpectralShiftFactor xshift_FFTfromCell, xshift_FFTtoCell,
zshift_FFTfromCell, zshift_FFTtoCell;
#if (AMREX_SPACEDIM==3)
SpectralShiftFactor yshift_FFTfromCell, yshift_FFTtoCell;
#endif
};
#endif // WARPX_SPECTRAL_FIELD_DATA_H_
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