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e7a72986 MD |
1 | /* classes: h_files */ |
2 | ||
8c494e99 DH |
3 | #ifndef SCM_RANDOM_H |
4 | #define SCM_RANDOM_H | |
5 | ||
6 | /* Copyright (C) 1999,2000,2001 Free Software Foundation, Inc. | |
7 | * | |
73be1d9e MV |
8 | * This library is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
8c494e99 | 12 | * |
73be1d9e | 13 | * This library is distributed in the hope that it will be useful, |
e7a72986 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * Lesser General Public License for more details. | |
8c494e99 | 17 | * |
73be1d9e MV |
18 | * You should have received a copy of the GNU Lesser General Public |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
d3a6bc94 | 22 | |
e7a72986 MD |
23 | \f |
24 | ||
25 | #include "libguile/__scm.h" | |
26 | ||
27 | \f | |
28 | /* | |
29 | * A plugin interface for RNGs | |
30 | * | |
31 | * Using this interface, it is possible for the application to tell | |
32 | * libguile to use a different RNG. This is desirable if it is | |
33 | * necessary to use the same RNG everywhere in the application in | |
34 | * order to prevent interference, if the application uses RNG | |
35 | * hardware, or if the application has special demands on the RNG. | |
36 | * | |
37 | * Look how the default generator is "plugged in" in scm_init_random(). | |
38 | */ | |
39 | ||
92c2555f | 40 | typedef struct scm_t_rstate { |
e7a72986 MD |
41 | int reserved0; |
42 | double reserved1; | |
43 | /* Custom fields follow here */ | |
92c2555f | 44 | } scm_t_rstate; |
e7a72986 | 45 | |
92c2555f | 46 | typedef struct scm_t_rng { |
e7a72986 | 47 | size_t rstate_size; /* size of random state */ |
92c2555f | 48 | unsigned long (*random_bits) (scm_t_rstate *state); /* gives 32 random bits */ |
cc95e00a | 49 | void (*init_rstate) (scm_t_rstate *state, const char *seed, int n); |
92c2555f MV |
50 | scm_t_rstate *(*copy_rstate) (scm_t_rstate *state); |
51 | } scm_t_rng; | |
e7a72986 | 52 | |
33b001fd | 53 | SCM_API scm_t_rng scm_the_rng; |
e7a72986 MD |
54 | |
55 | \f | |
56 | /* | |
57 | * Default RNG | |
58 | */ | |
92c2555f MV |
59 | typedef struct scm_t_i_rstate { |
60 | scm_t_rstate rstate; | |
e7a72986 MD |
61 | unsigned long w; |
62 | unsigned long c; | |
92c2555f | 63 | } scm_t_i_rstate; |
e7a72986 | 64 | |
33b001fd | 65 | SCM_API unsigned long scm_i_uniform32 (scm_t_i_rstate *); |
cc95e00a | 66 | SCM_API void scm_i_init_rstate (scm_t_i_rstate *, const char *seed, int n); |
33b001fd | 67 | SCM_API scm_t_i_rstate *scm_i_copy_rstate (scm_t_i_rstate *); |
e7a72986 MD |
68 | |
69 | \f | |
70 | /* | |
71 | * Random number library functions | |
72 | */ | |
cc95e00a | 73 | SCM_API scm_t_rstate *scm_c_make_rstate (const char *, int); |
33b001fd | 74 | SCM_API scm_t_rstate *scm_c_default_rstate (void); |
9b741bb6 | 75 | #define scm_c_uniform32(RSTATE) scm_the_rng.random_bits (RSTATE) |
33b001fd MV |
76 | SCM_API double scm_c_uniform01 (scm_t_rstate *); |
77 | SCM_API double scm_c_normal01 (scm_t_rstate *); | |
78 | SCM_API double scm_c_exp1 (scm_t_rstate *); | |
79 | SCM_API unsigned long scm_c_random (scm_t_rstate *, unsigned long m); | |
80 | SCM_API SCM scm_c_random_bignum (scm_t_rstate *, SCM m); | |
e7a72986 MD |
81 | |
82 | \f | |
83 | /* | |
84 | * Scheme level interface | |
85 | */ | |
33b001fd | 86 | SCM_API scm_t_bits scm_tc16_rstate; |
f5710d53 MV |
87 | #define SCM_RSTATEP(obj) SCM_SMOB_PREDICATE (scm_tc16_rstate, obj) |
88 | #define SCM_RSTATE(obj) ((scm_t_rstate *) SCM_SMOB_DATA (obj)) | |
e7a72986 | 89 | |
33b001fd MV |
90 | SCM_API unsigned char scm_masktab[256]; |
91 | ||
92 | SCM_API SCM scm_var_random_state; | |
93 | SCM_API SCM scm_random (SCM n, SCM state); | |
94 | SCM_API SCM scm_copy_random_state (SCM state); | |
95 | SCM_API SCM scm_seed_to_random_state (SCM seed); | |
96 | SCM_API SCM scm_random_uniform (SCM state); | |
97 | SCM_API SCM scm_random_solid_sphere_x (SCM v, SCM state); | |
98 | SCM_API SCM scm_random_hollow_sphere_x (SCM v, SCM state); | |
99 | SCM_API SCM scm_random_normal (SCM state); | |
100 | SCM_API SCM scm_random_normal_vector_x (SCM v, SCM state); | |
101 | SCM_API SCM scm_random_exp (SCM state); | |
102 | SCM_API void scm_init_random (void); | |
e7a72986 | 103 | |
8c494e99 | 104 | #endif /* SCM_RANDOM_H */ |
89e00824 ML |
105 | |
106 | /* | |
107 | Local Variables: | |
108 | c-file-style: "gnu" | |
109 | End: | |
110 | */ |