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fftw_engine.hh
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Wed, Sep 11, 02:26
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rTAMAAS tamaas
fftw_engine.hh
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-2020 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/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef FFTW_ENGINE_H
#define FFTW_ENGINE_H
/* -------------------------------------------------------------------------- */
#include "fft_engine.hh"
/* -------------------------------------------------------------------------- */
namespace
tamaas
{
class
FFTWEngine
:
public
FFTEngine
{
private
:
/// Perform forward (R2C) transform
template
<
UInt
dim
>
void
forwardImpl
(
Grid
<
Real
,
dim
>&
real
,
GridHermitian
<
Real
,
dim
>&
spectral
);
/// Perform backward (C2R) transform
template
<
UInt
dim
>
void
backwardImpl
(
Grid
<
Real
,
dim
>&
real
,
GridHermitian
<
Real
,
dim
>&
spectral
);
/// Return the plans pair for a given transform signature
plan_t
&
getPlans
(
key_t
key
);
public
:
/// Initialize with flags
explicit
FFTWEngine
(
unsigned
int
flags
=
FFTW_ESTIMATE
)
noexcept
:
_flags
(
flags
),
plans
()
{}
void
forward
(
Grid
<
Real
,
1
>&
real
,
GridHermitian
<
Real
,
1
>&
spectral
)
override
{
forwardImpl
(
real
,
spectral
);
}
void
forward
(
Grid
<
Real
,
2
>&
real
,
GridHermitian
<
Real
,
2
>&
spectral
)
override
{
forwardImpl
(
real
,
spectral
);
}
void
backward
(
Grid
<
Real
,
1
>&
real
,
GridHermitian
<
Real
,
1
>&
spectral
)
override
{
backwardImpl
(
real
,
spectral
);
}
void
backward
(
Grid
<
Real
,
2
>&
real
,
GridHermitian
<
Real
,
2
>&
spectral
)
override
{
backwardImpl
(
real
,
spectral
);
}
unsigned
int
flags
()
const
{
return
_flags
;
}
protected
:
unsigned
int
_flags
;
///< FFTW flags
std
::
map
<
key_t
,
plan_t
>
plans
;
///< plans corresponding to signatures
};
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
void
FFTWEngine
::
forwardImpl
(
Grid
<
Real
,
dim
>&
real
,
GridHermitian
<
Real
,
dim
>&
spectral
)
{
auto
&
plans
=
getPlans
(
make_key
(
real
,
spectral
));
fftw
::
execute
(
plans
.
first
,
real
.
getInternalData
(),
cast
(
spectral
.
getInternalData
()));
}
template
<
UInt
dim
>
void
FFTWEngine
::
backwardImpl
(
Grid
<
Real
,
dim
>&
real
,
GridHermitian
<
Real
,
dim
>&
spectral
)
{
auto
&
plans
=
getPlans
(
make_key
(
real
,
spectral
));
fftw
::
execute
(
plans
.
second
,
cast
(
spectral
.
getInternalData
()),
real
.
getInternalData
());
// Normalize
real
*=
(
1.
/
real
.
getNbPoints
());
}
}
// namespace tamaas
#endif
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