1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/* classes: h_files */
#ifndef SCM_RANDOM_H
#define SCM_RANDOM_H
/* Copyright (C) 1999,2000,2001 Free Software Foundation, Inc.
*
* 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, 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include "libguile/__scm.h"
/*
* A plugin interface for RNGs
*
* Using this interface, it is possible for the application to tell
* libguile to use a different RNG. This is desirable if it is
* necessary to use the same RNG everywhere in the application in
* order to prevent interference, if the application uses RNG
* hardware, or if the application has special demands on the RNG.
*
* Look how the default generator is "plugged in" in scm_init_random().
*/
typedef struct scm_t_rstate {
int reserved0;
double reserved1;
/* Custom fields follow here */
} scm_t_rstate;
typedef struct scm_t_rng {
size_t rstate_size; /* size of random state */
unsigned long (*random_bits) (scm_t_rstate *state); /* gives 32 random bits */
void (*init_rstate) (scm_t_rstate *state, char *seed, int n);
scm_t_rstate *(*copy_rstate) (scm_t_rstate *state);
} scm_t_rng;
SCM_API scm_t_rng scm_the_rng;
/*
* Default RNG
*/
typedef struct scm_t_i_rstate {
scm_t_rstate rstate;
unsigned long w;
unsigned long c;
} scm_t_i_rstate;
SCM_API unsigned long scm_i_uniform32 (scm_t_i_rstate *);
SCM_API void scm_i_init_rstate (scm_t_i_rstate *, char *seed, int n);
SCM_API scm_t_i_rstate *scm_i_copy_rstate (scm_t_i_rstate *);
/*
* Random number library functions
*/
SCM_API scm_t_rstate *scm_c_make_rstate (char *, int);
SCM_API scm_t_rstate *scm_c_default_rstate (void);
#define scm_c_uniform32(RSTATE) scm_the_rng.random_bits (RSTATE)
SCM_API double scm_c_uniform01 (scm_t_rstate *);
SCM_API double scm_c_normal01 (scm_t_rstate *);
SCM_API double scm_c_exp1 (scm_t_rstate *);
SCM_API unsigned long scm_c_random (scm_t_rstate *, unsigned long m);
SCM_API SCM scm_c_random_bignum (scm_t_rstate *, SCM m);
/*
* Scheme level interface
*/
SCM_API scm_t_bits scm_tc16_rstate;
#define SCM_RSTATEP(obj) SCM_TYP16_PREDICATE (scm_tc16_rstate, obj)
#define SCM_RSTATE(obj) ((scm_t_rstate *) SCM_CELL_WORD_1 (obj))
SCM_API unsigned char scm_masktab[256];
SCM_API SCM scm_var_random_state;
SCM_API SCM scm_random (SCM n, SCM state);
SCM_API SCM scm_copy_random_state (SCM state);
SCM_API SCM scm_seed_to_random_state (SCM seed);
SCM_API SCM scm_random_uniform (SCM state);
SCM_API SCM scm_random_solid_sphere_x (SCM v, SCM state);
SCM_API SCM scm_random_hollow_sphere_x (SCM v, SCM state);
SCM_API SCM scm_random_normal (SCM state);
SCM_API SCM scm_random_normal_vector_x (SCM v, SCM state);
SCM_API SCM scm_random_exp (SCM state);
SCM_API void scm_init_random (void);
#endif /* SCM_RANDOM_H */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|