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| 2 | pj | 1 | /* |
| 2 | * Copyright (c) 1997-1999 Massachusetts Institute of Technology |
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| 3 | * |
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| 4 | * This program is free software; you can redistribute it and/or modify |
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| 5 | * it under the terms of the GNU General Public License as published by |
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| 6 | * the Free Software Foundation; either version 2 of the License, or |
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| 7 | * (at your option) any later version. |
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| 8 | * |
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| 9 | * This program is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | * GNU General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU General Public License |
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| 15 | * along with this program; if not, write to the Free Software |
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| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 17 | * |
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| 18 | */ |
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| 19 | |||
| 20 | #include <ports/fftw.h> |
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| 21 | #include <ports/f77_func.h> |
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| 22 | |||
| 23 | #ifdef F77_FUNC_ /* only compile wrappers if fortran mangling is known */ |
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| 24 | |||
| 25 | /* fftwf77.c: |
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| 26 | |||
| 27 | FORTRAN-callable "wrappers" for some of the FFTW routines. To |
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| 28 | make these routines callable from FORTRAN, three things had to |
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| 29 | be done: |
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| 30 | |||
| 31 | * The routine names have to be in the style that is expected by |
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| 32 | the FORTRAN linker. This is accomplished with the F77_FUNC_ |
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| 33 | macro. (See the file "f77_func.h".) |
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| 34 | |||
| 35 | * All parameters must be passed by reference. |
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| 36 | |||
| 37 | * Return values had to be converted into parameters (some |
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| 38 | Fortran implementations seem to have trouble calling C functions |
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| 39 | that return a value). |
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| 40 | |||
| 41 | Note that the "fftw_plan" and "fftwnd_plan" types are pointers. |
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| 42 | The calling FORTRAN code should use a type of the same size |
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| 43 | (probably "integer"). |
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| 44 | |||
| 45 | The wrapper routines have the same name as the wrapped routine, |
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| 46 | except that "fftw" and "fftwnd" are replaced by "fftw_f77" and |
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| 47 | "fftwnd_f77". |
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| 48 | |||
| 49 | */ |
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| 50 | |||
| 51 | #ifdef __cplusplus |
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| 52 | extern "C" { |
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| 53 | #endif /* __cplusplus */ |
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| 54 | |||
| 55 | /************************************************************************/ |
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| 56 | |||
| 57 | void F77_FUNC_(fftw_f77_create_plan,FFTW_F77_CREATE_PLAN) |
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| 58 | (fftw_plan *p, int *n, int *idir, int *flags) |
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| 59 | { |
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| 60 | fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD; |
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| 61 | |||
| 62 | *p = fftw_create_plan(*n,dir,*flags); |
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| 63 | } |
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| 64 | |||
| 65 | void F77_FUNC_(fftw_f77_destroy_plan,FFTW_F77_DESTROY_PLAN) |
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| 66 | (fftw_plan *p) |
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| 67 | { |
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| 68 | fftw_destroy_plan(*p); |
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| 69 | } |
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| 70 | |||
| 71 | void F77_FUNC_(fftw_f77,FFTW_F77) |
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| 72 | (fftw_plan *p, int *howmany, fftw_complex *in, int *istride, int *idist, |
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| 73 | fftw_complex *out, int *ostride, int *odist) |
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| 74 | { |
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| 75 | fftw(*p,*howmany,in,*istride,*idist,out,*ostride,*odist); |
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| 76 | } |
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| 77 | |||
| 78 | void F77_FUNC_(fftw_f77_one,FFTW_F77_ONE) |
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| 79 | (fftw_plan *p, fftw_complex *in, fftw_complex *out) |
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| 80 | { |
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| 81 | fftw_one(*p,in,out); |
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| 82 | } |
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| 83 | |||
| 84 | void fftw_reverse_int_array(int *a, int n) |
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| 85 | { |
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| 86 | int i; |
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| 87 | |||
| 88 | for (i = 0; i < n/2; ++i) { |
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| 89 | int swap_dummy = a[i]; |
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| 90 | a[i] = a[n - 1 - i]; |
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| 91 | a[n - 1 - i] = swap_dummy; |
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| 92 | } |
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| 93 | } |
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| 94 | |||
| 95 | void F77_FUNC_(fftwnd_f77_create_plan,FFTWND_F77_CREATE_PLAN) |
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| 96 | (fftwnd_plan *p, int *rank, int *n, int *idir, int *flags) |
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| 97 | { |
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| 98 | fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD; |
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| 99 | |||
| 100 | fftw_reverse_int_array(n,*rank); /* column-major -> row-major */ |
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| 101 | *p = fftwnd_create_plan(*rank,n,dir,*flags); |
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| 102 | fftw_reverse_int_array(n,*rank); /* reverse back */ |
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| 103 | } |
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| 104 | |||
| 105 | void F77_FUNC_(fftw2d_f77_create_plan,FFTW2D_F77_CREATE_PLAN) |
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| 106 | (fftwnd_plan *p, int *nx, int *ny, int *idir, int *flags) |
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| 107 | { |
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| 108 | fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD; |
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| 109 | |||
| 110 | *p = fftw2d_create_plan(*ny,*nx,dir,*flags); |
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| 111 | } |
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| 112 | |||
| 113 | void F77_FUNC_(fftw3d_f77_create_plan,FFTW3D_F77_CREATE_PLAN) |
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| 114 | (fftwnd_plan *p, int *nx, int *ny, int *nz, int *idir, int *flags) |
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| 115 | { |
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| 116 | fftw_direction dir = *idir < 0 ? FFTW_FORWARD : FFTW_BACKWARD; |
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| 117 | |||
| 118 | *p = fftw3d_create_plan(*nz,*ny,*nx,dir,*flags); |
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| 119 | } |
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| 120 | |||
| 121 | void F77_FUNC_(fftwnd_f77_destroy_plan,FFTWND_F77_DESTROY_PLAN) |
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| 122 | (fftwnd_plan *p) |
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| 123 | { |
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| 124 | fftwnd_destroy_plan(*p); |
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| 125 | } |
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| 126 | |||
| 127 | void F77_FUNC_(fftwnd_f77,FFTWND_F77) |
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| 128 | (fftwnd_plan *p, int *howmany, fftw_complex *in, int *istride, int *idist, |
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| 129 | fftw_complex *out, int *ostride, int *odist) |
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| 130 | { |
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| 131 | fftwnd(*p,*howmany,in,*istride,*idist,out,*ostride,*odist); |
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| 132 | } |
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| 133 | |||
| 134 | void F77_FUNC_(fftwnd_f77_one,FFTWND_F77_ONE) |
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| 135 | (fftwnd_plan *p, fftw_complex *in, fftw_complex *out) |
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| 136 | { |
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| 137 | fftwnd_one(*p,in,out); |
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| 138 | } |
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| 139 | |||
| 140 | /****************************************************************************/ |
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| 141 | |||
| 142 | #ifdef __cplusplus |
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| 143 | } /* extern "C" */ |
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| 144 | #endif /* __cplusplus */ |
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| 145 | |||
| 146 | #endif /* defined(F77_FUNC_) */ |