ref: 4f9a9087f16b92662389be3dc0589629359ac8a4
dir: /libfaad/fftw/fftwf77.c/
/*
* Copyright (c) 1997-1999 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <fftw.h>
#include <f77_func.h>
#ifdef F77_FUNC_ /* only compile wrappers if fortran mangling is known */
/* fftwf77.c:
FORTRAN-callable "wrappers" for some of the FFTW routines. To
make these routines callable from FORTRAN, three things had to
be done:
* The routine names have to be in the style that is expected by
the FORTRAN linker. This is accomplished with the F77_FUNC_
macro. (See the file "f77_func.h".)
* All parameters must be passed by reference.
* Return values had to be converted into parameters (some
Fortran implementations seem to have trouble calling C functions
that return a value).
Note that the "fftw_plan" and "fftwnd_plan" types are pointers.
The calling FORTRAN code should use a type of the same size
(probably "integer").
The wrapper routines have the same name as the wrapped routine,
except that "fftw" and "fftwnd" are replaced by "fftw_f77" and
"fftwnd_f77".
*/
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/************************************************************************/
void F77_FUNC_(fftw_f77_create_plan,FFTW_F77_CREATE_PLAN)
(fftw_plan *p, int *n, int *idir, int *flags)
{
fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD;
*p = fftw_create_plan(*n,dir,*flags);
}
void F77_FUNC_(fftw_f77_destroy_plan,FFTW_F77_DESTROY_PLAN)
(fftw_plan *p)
{
fftw_destroy_plan(*p);
}
void F77_FUNC_(fftw_f77,FFTW_F77)
(fftw_plan *p, int *howmany, fftw_complex *in, int *istride, int *idist,
fftw_complex *out, int *ostride, int *odist)
{
fftw(*p,*howmany,in,*istride,*idist,out,*ostride,*odist);
}
void F77_FUNC_(fftw_f77_one,FFTW_F77_ONE)
(fftw_plan *p, fftw_complex *in, fftw_complex *out)
{
fftw_one(*p,in,out);
}
void fftw_reverse_int_array(int *a, int n)
{
int i;
for (i = 0; i < n/2; ++i) {
int swap_dummy = a[i];
a[i] = a[n - 1 - i];
a[n - 1 - i] = swap_dummy;
}
}
void F77_FUNC_(fftwnd_f77_create_plan,FFTWND_F77_CREATE_PLAN)
(fftwnd_plan *p, int *rank, int *n, int *idir, int *flags)
{
fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD;
fftw_reverse_int_array(n,*rank); /* column-major -> row-major */
*p = fftwnd_create_plan(*rank,n,dir,*flags);
fftw_reverse_int_array(n,*rank); /* reverse back */
}
void F77_FUNC_(fftw2d_f77_create_plan,FFTW2D_F77_CREATE_PLAN)
(fftwnd_plan *p, int *nx, int *ny, int *idir, int *flags)
{
fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD;
*p = fftw2d_create_plan(*ny,*nx,dir,*flags);
}
void F77_FUNC_(fftw3d_f77_create_plan,FFTW3D_F77_CREATE_PLAN)
(fftwnd_plan *p, int *nx, int *ny, int *nz, int *idir, int *flags)
{
fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD;
*p = fftw3d_create_plan(*nz,*ny,*nx,dir,*flags);
}
void F77_FUNC_(fftwnd_f77_destroy_plan,FFTWND_F77_DESTROY_PLAN)
(fftwnd_plan *p)
{
fftwnd_destroy_plan(*p);
}
void F77_FUNC_(fftwnd_f77,FFTWND_F77)
(fftwnd_plan *p, int *howmany, fftw_complex *in, int *istride, int *idist,
fftw_complex *out, int *ostride, int *odist)
{
fftwnd(*p,*howmany,in,*istride,*idist,out,*ostride,*odist);
}
void F77_FUNC_(fftwnd_f77_one,FFTWND_F77_ONE)
(fftwnd_plan *p, fftw_complex *in, fftw_complex *out)
{
fftwnd_one(*p,in,out);
}
/****************************************************************************/
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif /* defined(F77_FUNC_) */