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fftransform_cufft.cpp
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Sat, Aug 31, 02:53
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rTAMAAS tamaas
fftransform_cufft.cpp
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/**
* @file
*
* @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/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "fftransform_cufft.hh"
#define MAX_THREADS 1024
__BEGIN_TAMAAS__
template
<
typename
T
,
UInt
dim
>
FFTransformCUFFT
<
T
,
dim
>::
FFTransformCUFFT
(
Grid
<
T
,
dim
>&
real
,
GridHermitian
<
T
,
dim
>&
spectral
)
:
FFTransform
<
T
,
dim
>
(
real
,
spectral
)
{
const
UInt
size
=
real
.
sizes
()[
0
];
const
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
=
components
,
ostride
=
components
;
int
*
inembed
=
nullptr
,
*
onembed
=
nullptr
;
// row major
cufftResult
forward_res
=
cufftPlanMany
(
&
forward_plan
,
rank
,
n
,
inembed
,
istride
,
idist
,
onembed
,
ostride
,
odist
,
CUFFT_D2Z
,
howmany
);
cufftResult
backward_res
=
cufftPlanMany
(
&
backward_plan
,
rank
,
n
,
onembed
,
ostride
,
odist
,
inembed
,
istride
,
idist
,
CUFFT_Z2D
,
howmany
);
if
(
forward_res
!=
CUFFT_SUCCESS
)
TAMAAS_EXCEPTION
(
"Forward cufft plan creation failed"
);
if
(
backward_res
!=
CUFFT_SUCCESS
)
TAMAAS_EXCEPTION
(
"Backward cufft plan creation failed"
);
}
/* -------------------------------------------------------------------------- */
template
<
typename
T
,
UInt
dim
>
FFTransformCUFFT
<
T
,
dim
>::~
FFTransformCUFFT
()
{
cufftDestroy
(
forward_plan
);
cufftDestroy
(
backward_plan
);
}
/* -------------------------------------------------------------------------- */
template
<
typename
T
,
UInt
dim
>
void
FFTransformCUFFT
<
T
,
dim
>::
forwardTransform
()
{
cufftDoubleComplex
*
out
=
reinterpret_cast
<
cufftDoubleComplex
*>
(
this
->
spectral
.
getInternalData
());
if
(
cufftExecD2Z
(
forward_plan
,
this
->
real
.
getInternalData
(),
out
)
!=
CUFFT_SUCCESS
)
TAMAAS_EXCEPTION
(
"Forward transform fail"
);
cudaDeviceSynchronize
();
///< TODO ask the SCITAS guys
}
/* -------------------------------------------------------------------------- */
template
<
typename
T
,
UInt
dim
>
void
FFTransformCUFFT
<
T
,
dim
>::
backwardTransform
()
{
cufftDoubleComplex
*
out
=
reinterpret_cast
<
cufftDoubleComplex
*>
(
this
->
spectral
.
getInternalData
());
if
(
cufftExecZ2D
(
backward_plan
,
out
,
this
->
real
.
getInternalData
())
!=
CUFFT_SUCCESS
)
TAMAAS_EXCEPTION
(
"Backward transform fail"
);
cudaDeviceSynchronize
();
///< TODO ask the SCITAS guys
this
->
normalize
();
}
/* -------------------------------------------------------------------------- */
template
class
FFTransformCUFFT
<
Real
,
1
>
;
template
class
FFTransformCUFFT
<
Real
,
2
>
;
template
class
FFTransformCUFFT
<
Real
,
3
>
;
__END_TAMAAS__
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