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fftw.h
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Wed, Nov 20, 00:22

fftw.h
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/* -*- C -*- */
/*
* Copyright (c) 1997-1999, 2003 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
*
*/
/* fftw.h -- system-wide definitions */
/* $Id: fftw.h,v 1.1 2011/06/10 17:15:07 morozov Exp $ */
#ifndef FFTW_H
#define FFTW_H
#include <stdlib.h>
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* Define for using single precision */
/*
* If you can, use configure --enable-float instead of changing this
* flag directly
*/
/* #undef FFTW_ENABLE_FLOAT */
/* our real numbers */
#ifdef FFTW_ENABLE_FLOAT
typedef float fftw_real;
#else
typedef double fftw_real;
#endif
/*********************************************
* Complex numbers and operations
*********************************************/
typedef struct {
fftw_real re, im;
} fftw_complex;
#define c_re(c) ((c).re)
#define c_im(c) ((c).im)
typedef enum {
FFTW_FORWARD = -1, FFTW_BACKWARD = 1
} fftw_direction;
/* backward compatibility with FFTW-1.3 */
typedef fftw_complex FFTW_COMPLEX;
typedef fftw_real FFTW_REAL;
#ifndef FFTW_1_0_COMPATIBILITY
#define FFTW_1_0_COMPATIBILITY 0
#endif
#if FFTW_1_0_COMPATIBILITY
/* backward compatibility with FFTW-1.0 */
#define REAL fftw_real
#define COMPLEX fftw_complex
#endif
/*********************************************
* Success or failure status
*********************************************/
typedef enum {
FFTW_SUCCESS = 0, FFTW_FAILURE = -1
} fftw_status;
/*********************************************
* Codelets
*********************************************/
typedef void (fftw_notw_codelet)
(const fftw_complex *, fftw_complex *, int, int);
typedef void (fftw_twiddle_codelet)
(fftw_complex *, const fftw_complex *, int,
int, int);
typedef void (fftw_generic_codelet)
(fftw_complex *, const fftw_complex *, int,
int, int, int);
typedef void (fftw_real2hc_codelet)
(const fftw_real *, fftw_real *, fftw_real *,
int, int, int);
typedef void (fftw_hc2real_codelet)
(const fftw_real *, const fftw_real *,
fftw_real *, int, int, int);
typedef void (fftw_hc2hc_codelet)
(fftw_real *, const fftw_complex *,
int, int, int);
typedef void (fftw_rgeneric_codelet)
(fftw_real *, const fftw_complex *, int,
int, int, int);
/*********************************************
* Configurations
*********************************************/
/*
* A configuration is a database of all known codelets
*/
enum fftw_node_type {
FFTW_NOTW, FFTW_TWIDDLE, FFTW_GENERIC, FFTW_RADER,
FFTW_REAL2HC, FFTW_HC2REAL, FFTW_HC2HC, FFTW_RGENERIC
};
/* description of a codelet */
typedef struct {
const char *name; /* name of the codelet */
void (*codelet) (); /* pointer to the codelet itself */
int size; /* size of the codelet */
fftw_direction dir; /* direction */
enum fftw_node_type type; /* TWIDDLE or NO_TWIDDLE */
int signature; /* unique id */
int ntwiddle; /* number of twiddle factors */
const int *twiddle_order; /*
* array that determines the order
* in which the codelet expects
* the twiddle factors
*/
} fftw_codelet_desc;
/* On Win32, you need to do funny things to access global variables
in shared libraries. Thanks to Andrew Sterian for this hack. */
#ifdef HAVE_WIN32
# if defined(BUILD_FFTW_DLL)
# define DL_IMPORT(type) __declspec(dllexport) type
# elif defined(USE_FFTW_DLL)
# define DL_IMPORT(type) __declspec(dllimport) type
# else
# define DL_IMPORT(type) type
# endif
#else
# define DL_IMPORT(type) type
#endif
extern DL_IMPORT(const char *) fftw_version;
/*****************************
* Plans
*****************************/
/*
* A plan is a sequence of reductions to compute a FFT of
* a given size. At each step, the FFT algorithm can:
*
* 1) apply a notw codelet, or
* 2) recurse and apply a twiddle codelet, or
* 3) apply the generic codelet.
*/
/* structure that contains twiddle factors */
typedef struct fftw_twiddle_struct {
int n;
const fftw_codelet_desc *cdesc;
fftw_complex *twarray;
struct fftw_twiddle_struct *next;
int refcnt;
} fftw_twiddle;
typedef struct fftw_rader_data_struct {
struct fftw_plan_struct *plan;
fftw_complex *omega;
int g, ginv;
int p, flags, refcount;
struct fftw_rader_data_struct *next;
fftw_codelet_desc *cdesc;
} fftw_rader_data;
typedef void (fftw_rader_codelet)
(fftw_complex *, const fftw_complex *, int,
int, int, fftw_rader_data *);
/* structure that holds all the data needed for a given step */
typedef struct fftw_plan_node_struct {
enum fftw_node_type type;
union {
/* nodes of type FFTW_NOTW */
struct {
int size;
fftw_notw_codelet *codelet;
const fftw_codelet_desc *codelet_desc;
} notw;
/* nodes of type FFTW_TWIDDLE */
struct {
int size;
fftw_twiddle_codelet *codelet;
fftw_twiddle *tw;
struct fftw_plan_node_struct *recurse;
const fftw_codelet_desc *codelet_desc;
} twiddle;
/* nodes of type FFTW_GENERIC */
struct {
int size;
fftw_generic_codelet *codelet;
fftw_twiddle *tw;
struct fftw_plan_node_struct *recurse;
} generic;
/* nodes of type FFTW_RADER */
struct {
int size;
fftw_rader_codelet *codelet;
fftw_rader_data *rader_data;
fftw_twiddle *tw;
struct fftw_plan_node_struct *recurse;
} rader;
/* nodes of type FFTW_REAL2HC */
struct {
int size;
fftw_real2hc_codelet *codelet;
const fftw_codelet_desc *codelet_desc;
} real2hc;
/* nodes of type FFTW_HC2REAL */
struct {
int size;
fftw_hc2real_codelet *codelet;
const fftw_codelet_desc *codelet_desc;
} hc2real;
/* nodes of type FFTW_HC2HC */
struct {
int size;
fftw_direction dir;
fftw_hc2hc_codelet *codelet;
fftw_twiddle *tw;
struct fftw_plan_node_struct *recurse;
const fftw_codelet_desc *codelet_desc;
} hc2hc;
/* nodes of type FFTW_RGENERIC */
struct {
int size;
fftw_direction dir;
fftw_rgeneric_codelet *codelet;
fftw_twiddle *tw;
struct fftw_plan_node_struct *recurse;
} rgeneric;
} nodeu;
int refcnt;
} fftw_plan_node;
typedef enum {
FFTW_NORMAL_RECURSE = 0,
FFTW_VECTOR_RECURSE = 1
} fftw_recurse_kind;
struct fftw_plan_struct {
int n;
int refcnt;
fftw_direction dir;
int flags;
int wisdom_signature;
enum fftw_node_type wisdom_type;
struct fftw_plan_struct *next;
fftw_plan_node *root;
double cost;
fftw_recurse_kind recurse_kind;
int vector_size;
};
typedef struct fftw_plan_struct *fftw_plan;
/* flags for the planner */
#define FFTW_ESTIMATE (0)
#define FFTW_MEASURE (1)
#define FFTW_OUT_OF_PLACE (0)
#define FFTW_IN_PLACE (8)
#define FFTW_USE_WISDOM (16)
#define FFTW_THREADSAFE (128) /* guarantee plan is read-only so that the
same plan can be used in parallel by
multiple threads */
#define FFTWND_FORCE_BUFFERED (256) /* internal flag, forces buffering
in fftwnd transforms */
#define FFTW_NO_VECTOR_RECURSE (512) /* internal flag, prevents use
of vector recursion */
extern fftw_plan fftw_create_plan_specific(int n, fftw_direction dir,
int flags,
fftw_complex *in, int istride,
fftw_complex *out, int ostride);
#define FFTW_HAS_PLAN_SPECIFIC
extern fftw_plan fftw_create_plan(int n, fftw_direction dir, int flags);
extern void fftw_print_plan(fftw_plan plan);
extern void fftw_destroy_plan(fftw_plan plan);
extern void fftw(fftw_plan plan, int howmany, fftw_complex *in, int istride,
int idist, fftw_complex *out, int ostride, int odist);
extern void fftw_one(fftw_plan plan, fftw_complex *in, fftw_complex *out);
extern void fftw_die(const char *s);
extern void *fftw_malloc(size_t n);
extern void fftw_free(void *p);
extern void fftw_check_memory_leaks(void);
extern void fftw_print_max_memory_usage(void);
typedef void *(*fftw_malloc_type_function) (size_t n);
typedef void (*fftw_free_type_function) (void *p);
typedef void (*fftw_die_type_function) (const char *errString);
extern DL_IMPORT(fftw_malloc_type_function) fftw_malloc_hook;
extern DL_IMPORT(fftw_free_type_function) fftw_free_hook;
extern DL_IMPORT(fftw_die_type_function) fftw_die_hook;
extern size_t fftw_sizeof_fftw_real(void);
/* Wisdom: */
/*
* define this symbol so that users know we are using a version of FFTW
* with wisdom
*/
#define FFTW_HAS_WISDOM
extern void fftw_forget_wisdom(void);
extern void fftw_export_wisdom(void (*emitter) (char c, void *), void *data);
extern fftw_status fftw_import_wisdom(int (*g) (void *), void *data);
extern void fftw_export_wisdom_to_file(FILE *output_file);
extern fftw_status fftw_import_wisdom_from_file(FILE *input_file);
extern char *fftw_export_wisdom_to_string(void);
extern fftw_status fftw_import_wisdom_from_string(const char *input_string);
/*
* define symbol so we know this function is available (it is not in
* older FFTWs)
*/
#define FFTW_HAS_FPRINT_PLAN
extern void fftw_fprint_plan(FILE *f, fftw_plan plan);
/*****************************
* N-dimensional code
*****************************/
typedef struct {
int is_in_place; /* 1 if for in-place FFTs, 0 otherwise */
int rank; /*
* the rank (number of dimensions) of the
* array to be FFTed
*/
int *n; /*
* the dimensions of the array to the
* FFTed
*/
fftw_direction dir;
int *n_before; /*
* n_before[i] = product of n[j] for j < i
*/
int *n_after; /* n_after[i] = product of n[j] for j > i */
fftw_plan *plans; /* 1d fftw plans for each dimension */
int nbuffers, nwork;
fftw_complex *work; /*
* work array big enough to hold
* nbuffers+1 of the largest dimension
* (has nwork elements)
*/
} fftwnd_data;
typedef fftwnd_data *fftwnd_plan;
/* Initializing the FFTWND plan: */
extern fftwnd_plan fftw2d_create_plan(int nx, int ny, fftw_direction dir,
int flags);
extern fftwnd_plan fftw3d_create_plan(int nx, int ny, int nz,
fftw_direction dir, int flags);
extern fftwnd_plan fftwnd_create_plan(int rank, const int *n,
fftw_direction dir,
int flags);
extern fftwnd_plan fftw2d_create_plan_specific(int nx, int ny,
fftw_direction dir,
int flags,
fftw_complex *in, int istride,
fftw_complex *out, int ostride);
extern fftwnd_plan fftw3d_create_plan_specific(int nx, int ny, int nz,
fftw_direction dir, int flags,
fftw_complex *in, int istride,
fftw_complex *out, int ostride);
extern fftwnd_plan fftwnd_create_plan_specific(int rank, const int *n,
fftw_direction dir,
int flags,
fftw_complex *in, int istride,
fftw_complex *out, int ostride);
/* Freeing the FFTWND plan: */
extern void fftwnd_destroy_plan(fftwnd_plan plan);
/* Printing the plan: */
extern void fftwnd_fprint_plan(FILE *f, fftwnd_plan p);
extern void fftwnd_print_plan(fftwnd_plan p);
#define FFTWND_HAS_PRINT_PLAN
/* Computing the N-Dimensional FFT */
extern void fftwnd(fftwnd_plan plan, int howmany,
fftw_complex *in, int istride, int idist,
fftw_complex *out, int ostride, int odist);
extern void fftwnd_one(fftwnd_plan p, fftw_complex *in, fftw_complex *out);
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif /* FFTW_H */

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