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tamaas/src/fftransform.hh
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fftransform.hh
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/**
*
* @author Lucas Frérot <lucas.frerot@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2016 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Tamaas is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Tamaas 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Tamaas. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef FFTRANSFORM_HH
#define FFTRANSFORM_HH
#include "tamaas.hh"
#include "surface.hh"
#include "surface_complex.hh"
#include <fftw3.h>
__BEGIN_TAMAAS__
enum FFTFlag {
ESTIMATE = FFTW_ESTIMATE,
MEASURE = FFTW_MEASURE // this one erases the data when creating plans
};
template <typename T>
class FFTransform {
public:
/// Constructor
FFTransform(UInt size,
Surface<T> & real,
SurfaceComplex<T> & spectral,
FFTFlag flag = ESTIMATE);
/// Destructor
virtual ~FFTransform();
public:
/// Perform FFT
void forwardTransform();
/// Perform IFFT
void backwardTransform();
/// Normalize the real surface after backward transform
void normalize();
/// Write buffer to spectral surface
void writeBuffer();
/// Load buffer from spectral surface
void loadBuffer();
private:
Surface<T> & real;
SurfaceComplex<T> & spectral;
fftw_plan forward_plan;
fftw_plan backward_plan;
fftw_complex * spectral_buffer;
UInt size, reduced_size;
};
__END_TAMAAS__
#endif // FFTRANSFORM_HH
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