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e7a72986 MD |
1 | /* classes: h_files */ |
2 | ||
3 | #ifndef RANDOMH | |
4 | #define RANDOMH | |
5 | /* Copyright (C) 1999 Free Software Foundation, Inc. | |
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. */ | |
45 | \f | |
46 | ||
47 | #include "libguile/__scm.h" | |
48 | ||
49 | \f | |
50 | /* | |
51 | * A plugin interface for RNGs | |
52 | * | |
53 | * Using this interface, it is possible for the application to tell | |
54 | * libguile to use a different RNG. This is desirable if it is | |
55 | * necessary to use the same RNG everywhere in the application in | |
56 | * order to prevent interference, if the application uses RNG | |
57 | * hardware, or if the application has special demands on the RNG. | |
58 | * | |
59 | * Look how the default generator is "plugged in" in scm_init_random(). | |
60 | */ | |
61 | ||
62 | typedef struct scm_rstate { | |
63 | int reserved0; | |
64 | double reserved1; | |
65 | /* Custom fields follow here */ | |
66 | } scm_rstate; | |
67 | ||
68 | typedef struct scm_rng { | |
69 | size_t rstate_size; /* size of random state */ | |
70 | unsigned long (*random_bits) (scm_rstate *state); /* gives 32 random bits */ | |
71 | void (*init_rstate) (scm_rstate *state, char *seed, int n); | |
72 | scm_rstate *(*copy_rstate) (scm_rstate *state); | |
73 | } scm_rng; | |
74 | ||
75 | extern scm_rng scm_the_rng; | |
76 | ||
77 | \f | |
78 | /* | |
79 | * Default RNG | |
80 | */ | |
81 | typedef struct scm_i_rstate { | |
82 | scm_rstate rstate; | |
83 | unsigned long w; | |
84 | unsigned long c; | |
85 | } scm_i_rstate; | |
86 | ||
87 | extern unsigned long scm_i_uniform32 (scm_i_rstate *); | |
88 | extern void scm_i_init_rstate (scm_i_rstate *, char *seed, int n); | |
89 | extern scm_i_rstate *scm_i_copy_rstate (scm_i_rstate *); | |
90 | ||
91 | \f | |
92 | /* | |
93 | * Random number library functions | |
94 | */ | |
eccc8566 | 95 | extern scm_rstate *scm_i_make_rstate (char *, int); |
e7a72986 MD |
96 | extern double scm_i_uniform01 (scm_rstate *); |
97 | extern double scm_i_normal01 (scm_rstate *); | |
98 | extern double scm_i_exp1 (scm_rstate *); | |
99 | extern unsigned long scm_i_random (unsigned long m, scm_rstate *); | |
100 | extern SCM scm_i_random_bignum (SCM m, scm_rstate *); | |
101 | ||
102 | \f | |
103 | /* | |
104 | * Scheme level interface | |
105 | */ | |
106 | extern long scm_tc16_rstate; | |
107 | #define SCM_RSTATE(obj) ((scm_rstate *) SCM_CDR (obj)) | |
108 | #define SCM_RSTATEP(obj) (SCM_TYP16 (obj) == scm_tc16_rstate) | |
109 | ||
110 | extern unsigned char scm_masktab[256]; | |
111 | ||
112 | extern SCM scm_var_random_state; | |
113 | extern SCM scm_random (SCM n, SCM state); | |
eccc8566 MD |
114 | extern SCM scm_copy_random_state (SCM state); |
115 | extern SCM scm_seed_to_random_state (SCM seed); | |
e7a72986 MD |
116 | extern SCM scm_random_uniform (SCM state); |
117 | extern SCM scm_random_solid_sphere_x (SCM v, SCM state); | |
118 | extern SCM scm_random_hollow_sphere_x (SCM v, SCM state); | |
119 | extern SCM scm_random_normal (SCM state); | |
120 | extern SCM scm_random_normal_vector_x (SCM v, SCM state); | |
121 | extern SCM scm_random_exp (SCM state); | |
122 | extern void scm_init_random (void); | |
123 | ||
124 | #endif /* RANDOMH */ |