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fftransform_fftw.cpp
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Tue, Jun 25, 16:44
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rTAMAAS tamaas
fftransform_fftw.cpp
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-19 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "fftransform_fftw.hh"
#define TAMAAS_FFTW_FLAG FFTW_ESTIMATE
namespace
tamaas
{
template
<
typename
T
,
UInt
dim
>
FFTransformFFTW
<
T
,
dim
>::
FFTransformFFTW
(
Grid
<
T
,
dim
>&
real
,
GridHermitian
<
T
,
dim
>&
spectral
)
:
FFTransform
<
T
,
dim
>
(
real
,
spectral
),
forward_plan
(
nullptr
),
backward_plan
(
nullptr
)
{
TAMAAS_ASSERT
(
real
.
getNbComponents
()
==
spectral
.
getNbComponents
(),
"components for FFTW do not match"
);
// Data pointers
Real
*
in
=
this
->
real
.
getInternalData
();
complex_t
*
out
=
reinterpret_cast
<
complex_t
*>
(
this
->
spectral
.
getInternalData
());
int
components
=
real
.
getNbComponents
();
// fftw parameters
int
rank
=
dim
;
// dimension of fft
int
n
[
dim
]
=
{
0
};
std
::
copy
(
real
.
sizes
().
begin
(),
real
.
sizes
().
end
(),
n
);
// size of individual fft
int
howmany
=
components
;
// how many fft to compute
int
idist
=
1
,
odist
=
1
;
// components are next to each other in memory
int
istride
=
real
.
getStrides
().
back
()
*
components
,
ostride
=
spectral
.
getStrides
().
back
()
*
components
;
int
*
inembed
=
nullptr
,
*
onembed
=
nullptr
;
// row major
#if TAMAAS_FFTW_FLAG != FFTW_ESTIMATE
// backup the input
Grid
<
Real
,
dim
>
backup
(
real
);
#endif
forward_plan
=
fftw
::
plan_many_forward
(
rank
,
n
,
howmany
,
in
,
inembed
,
istride
,
idist
,
out
,
onembed
,
ostride
,
odist
,
TAMAAS_FFTW_FLAG
);
backward_plan
=
fftw
::
plan_many_backward
(
rank
,
n
,
howmany
,
out
,
onembed
,
ostride
,
odist
,
in
,
inembed
,
istride
,
idist
,
TAMAAS_FFTW_FLAG
);
#if TAMAAS_FFTW_FLAG != FFTW_ESTIMATE
// restore the backup
real
=
backup
;
#endif
}
/* -------------------------------------------------------------------------- */
template
<
typename
T
,
UInt
dim
>
FFTransformFFTW
<
T
,
dim
>::~
FFTransformFFTW
()
{
fftw
::
destroy
(
forward_plan
);
fftw
::
destroy
(
backward_plan
);
}
/* -------------------------------------------------------------------------- */
template
<
typename
T
,
UInt
dim
>
void
FFTransformFFTW
<
T
,
dim
>::
forwardTransform
()
{
fftw
::
execute
(
forward_plan
);
}
/* -------------------------------------------------------------------------- */
template
<
typename
T
,
UInt
dim
>
void
FFTransformFFTW
<
T
,
dim
>::
backwardTransform
()
{
fftw
::
execute
(
backward_plan
);
this
->
normalize
();
}
/* -------------------------------------------------------------------------- */
template
class
FFTransformFFTW
<
Real
,
1
>
;
template
class
FFTransformFFTW
<
Real
,
2
>
;
template
class
FFTransformFFTW
<
Real
,
3
>
;
}
// namespace tamaas
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