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e7a72986 MD |
1 | /* classes: h_files */ |
2 | ||
3 | #ifndef RANDOMH | |
4 | #define RANDOMH | |
f2c9fcb0 | 5 | /* Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
e7a72986 MD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2, or (at your option) | |
10 | * any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this software; see the file COPYING. If not, write to | |
19 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
20 | * Boston, MA 02111-1307 USA | |
21 | * | |
22 | * As a special exception, the Free Software Foundation gives permission | |
23 | * for additional uses of the text contained in its release of GUILE. | |
24 | * | |
25 | * The exception is that, if you link the GUILE library with other files | |
26 | * to produce an executable, this does not by itself cause the | |
27 | * resulting executable to be covered by the GNU General Public License. | |
28 | * Your use of that executable is in no way restricted on account of | |
29 | * linking the GUILE library code into it. | |
30 | * | |
31 | * This exception does not however invalidate any other reasons why | |
32 | * the executable file might be covered by the GNU General Public License. | |
33 | * | |
34 | * This exception applies only to the code released by the | |
35 | * Free Software Foundation under the name GUILE. If you copy | |
36 | * code from other Free Software Foundation releases into a copy of | |
37 | * GUILE, as the General Public License permits, the exception does | |
38 | * not apply to the code that you add in this way. To avoid misleading | |
39 | * anyone as to the status of such modified files, you must delete | |
40 | * this exception notice from them. | |
41 | * | |
42 | * If you write modifications of your own for GUILE, it is your choice | |
43 | * whether to permit this exception to apply to your modifications. | |
44 | * If you do not wish that, delete this exception notice. */ | |
d3a6bc94 GB |
45 | |
46 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
47 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
e7a72986 MD |
48 | \f |
49 | ||
50 | #include "libguile/__scm.h" | |
51 | ||
52 | \f | |
53 | /* | |
54 | * A plugin interface for RNGs | |
55 | * | |
56 | * Using this interface, it is possible for the application to tell | |
57 | * libguile to use a different RNG. This is desirable if it is | |
58 | * necessary to use the same RNG everywhere in the application in | |
59 | * order to prevent interference, if the application uses RNG | |
60 | * hardware, or if the application has special demands on the RNG. | |
61 | * | |
62 | * Look how the default generator is "plugged in" in scm_init_random(). | |
63 | */ | |
64 | ||
92c2555f | 65 | typedef struct scm_t_rstate { |
e7a72986 MD |
66 | int reserved0; |
67 | double reserved1; | |
68 | /* Custom fields follow here */ | |
92c2555f | 69 | } scm_t_rstate; |
e7a72986 | 70 | |
92c2555f | 71 | typedef struct scm_t_rng { |
e7a72986 | 72 | size_t rstate_size; /* size of random state */ |
92c2555f MV |
73 | unsigned long (*random_bits) (scm_t_rstate *state); /* gives 32 random bits */ |
74 | void (*init_rstate) (scm_t_rstate *state, char *seed, int n); | |
75 | scm_t_rstate *(*copy_rstate) (scm_t_rstate *state); | |
76 | } scm_t_rng; | |
e7a72986 | 77 | |
92c2555f | 78 | extern scm_t_rng scm_the_rng; |
e7a72986 MD |
79 | |
80 | \f | |
81 | /* | |
82 | * Default RNG | |
83 | */ | |
92c2555f MV |
84 | typedef struct scm_t_i_rstate { |
85 | scm_t_rstate rstate; | |
e7a72986 MD |
86 | unsigned long w; |
87 | unsigned long c; | |
92c2555f | 88 | } scm_t_i_rstate; |
e7a72986 | 89 | |
1be6b49c | 90 | #if (SCM_DEBUG_DEPRECATED == 0) |
92c2555f MV |
91 | # define scm_rstate scm_t_rstate |
92 | # define scm_rng scm_t_rng | |
93 | # define scm_i_rstate scm_t_i_rstate | |
1be6b49c ML |
94 | #endif |
95 | ||
92c2555f MV |
96 | extern unsigned long scm_i_uniform32 (scm_t_i_rstate *); |
97 | extern void scm_i_init_rstate (scm_t_i_rstate *, char *seed, int n); | |
98 | extern scm_t_i_rstate *scm_i_copy_rstate (scm_t_i_rstate *); | |
e7a72986 MD |
99 | |
100 | \f | |
101 | /* | |
102 | * Random number library functions | |
103 | */ | |
92c2555f MV |
104 | extern scm_t_rstate *scm_c_make_rstate (char *, int); |
105 | extern scm_t_rstate *scm_c_default_rstate (void); | |
9b741bb6 | 106 | #define scm_c_uniform32(RSTATE) scm_the_rng.random_bits (RSTATE) |
92c2555f MV |
107 | extern double scm_c_uniform01 (scm_t_rstate *); |
108 | extern double scm_c_normal01 (scm_t_rstate *); | |
109 | extern double scm_c_exp1 (scm_t_rstate *); | |
110 | extern unsigned long scm_c_random (scm_t_rstate *, unsigned long m); | |
111 | extern SCM scm_c_random_bignum (scm_t_rstate *, SCM m); | |
e7a72986 MD |
112 | |
113 | \f | |
114 | /* | |
115 | * Scheme level interface | |
116 | */ | |
92c2555f | 117 | extern scm_t_bits scm_tc16_rstate; |
e841c3e0 | 118 | #define SCM_RSTATEP(obj) SCM_TYP16_PREDICATE (scm_tc16_rstate, obj) |
92c2555f | 119 | #define SCM_RSTATE(obj) ((scm_t_rstate *) SCM_CELL_WORD_1 (obj)) |
e7a72986 MD |
120 | |
121 | extern unsigned char scm_masktab[256]; | |
122 | ||
123 | extern SCM scm_var_random_state; | |
124 | extern SCM scm_random (SCM n, SCM state); | |
eccc8566 MD |
125 | extern SCM scm_copy_random_state (SCM state); |
126 | extern SCM scm_seed_to_random_state (SCM seed); | |
e7a72986 MD |
127 | extern SCM scm_random_uniform (SCM state); |
128 | extern SCM scm_random_solid_sphere_x (SCM v, SCM state); | |
129 | extern SCM scm_random_hollow_sphere_x (SCM v, SCM state); | |
130 | extern SCM scm_random_normal (SCM state); | |
131 | extern SCM scm_random_normal_vector_x (SCM v, SCM state); | |
132 | extern SCM scm_random_exp (SCM state); | |
133 | extern void scm_init_random (void); | |
134 | ||
135 | #endif /* RANDOMH */ | |
89e00824 ML |
136 | |
137 | /* | |
138 | Local Variables: | |
139 | c-file-style: "gnu" | |
140 | End: | |
141 | */ |