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authorMikael Djurfeldt <djurfeldt@nada.kth.se>1999-01-10 07:57:27 +0000
committerMikael Djurfeldt <djurfeldt@nada.kth.se>1999-01-10 07:57:27 +0000
commite7a72986684114de55c73799e99c4fc9897f1cb8 (patch)
treefee1e4e9f4785dd9bca6c1d6191ce83c169ca9b6 /libguile/random.h
parent26ade7a21c6a9f061ec1d8e6748bef2bceed70d9 (diff)
downloadguile-e7a72986684114de55c73799e99c4fc9897f1cb8.tar.gz
* random.c, random.h: New files: Random number support.
Interface same as slib's.
Diffstat (limited to 'libguile/random.h')
-rw-r--r--libguile/random.h122
1 files changed, 122 insertions, 0 deletions
diff --git a/libguile/random.h b/libguile/random.h
new file mode 100644
index 000000000..9aa769270
--- /dev/null
+++ b/libguile/random.h
@@ -0,0 +1,122 @@
+/* classes: h_files */
+
+#ifndef RANDOMH
+#define RANDOMH
+/* Copyright (C) 1999 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_rstate {
+ int reserved0;
+ double reserved1;
+ /* Custom fields follow here */
+} scm_rstate;
+
+typedef struct scm_rng {
+ size_t rstate_size; /* size of random state */
+ unsigned long (*random_bits) (scm_rstate *state); /* gives 32 random bits */
+ void (*init_rstate) (scm_rstate *state, char *seed, int n);
+ scm_rstate *(*copy_rstate) (scm_rstate *state);
+} scm_rng;
+
+extern scm_rng scm_the_rng;
+
+
+/*
+ * Default RNG
+ */
+typedef struct scm_i_rstate {
+ scm_rstate rstate;
+ unsigned long w;
+ unsigned long c;
+} scm_i_rstate;
+
+extern unsigned long scm_i_uniform32 (scm_i_rstate *);
+extern void scm_i_init_rstate (scm_i_rstate *, char *seed, int n);
+extern scm_i_rstate *scm_i_copy_rstate (scm_i_rstate *);
+
+
+/*
+ * Random number library functions
+ */
+extern double scm_i_uniform01 (scm_rstate *);
+extern double scm_i_normal01 (scm_rstate *);
+extern double scm_i_exp1 (scm_rstate *);
+extern unsigned long scm_i_random (unsigned long m, scm_rstate *);
+extern SCM scm_i_random_bignum (SCM m, scm_rstate *);
+
+
+/*
+ * Scheme level interface
+ */
+extern long scm_tc16_rstate;
+#define SCM_RSTATE(obj) ((scm_rstate *) SCM_CDR (obj))
+#define SCM_RSTATEP(obj) (SCM_TYP16 (obj) == scm_tc16_rstate)
+
+extern unsigned char scm_masktab[256];
+
+extern SCM scm_var_random_state;
+extern SCM scm_random (SCM n, SCM state);
+extern SCM scm_make_random_state (SCM state);
+extern SCM scm_random_uniform (SCM state);
+extern SCM scm_random_solid_sphere_x (SCM v, SCM state);
+extern SCM scm_random_hollow_sphere_x (SCM v, SCM state);
+extern SCM scm_random_normal (SCM state);
+extern SCM scm_random_normal_vector_x (SCM v, SCM state);
+extern SCM scm_random_exp (SCM state);
+extern void scm_init_random (void);
+
+#endif /* RANDOMH */