src/common/random.h

/* RCSid: $Id$ */
/*
 *  random.h - header file for random(3) and urand() function.
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

#ifdef  NORANDOM

#undef  random
#define  random()       1073741820
#undef  srandom
#define  srandom(s)     (s)
#define  frandom()      0.5
#define  urand(i)       0.5
#define  initurand(n)   (n)

#else

#ifdef  MSDOS

#define random()        ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4)
#define srandom(s)      srand((unsigned)(s))

#define frandom()       (rand()*(1./32768.))

#else
#ifdef  BSD

extern long  random();

#define  frandom()      (random()*(1./2147483648.))

#else

extern long  lrand48();
extern double  drand48();

#define  random()       lrand48()
#define  srandom(s)     srand48((long)(s))
#define  frandom()      drand48()

#endif
#endif

#ifdef  MC

#define  urand(i)       frandom()
#define  initurand(n)   (n)

#else

extern unsigned short   *urperm;
extern int      urmask;

#define  urand(i)       ((urperm[(i)&urmask]+frandom())/(urmask+1))

#endif

#endif

#ifdef NOPROTO

extern int      initurand();
extern int      ilhash();
extern int      urind();
extern void     multisamp();

#else
                                /* defined in urand.c */
extern int      initurand(int size);
extern int      ilhash(int *d, int n);
                                /* defined in urind.c */
extern int      urind(int s, int i);
                                /* defined in multisamp.c */
extern void     multisamp(double t[], int n, double r);

#endif
Revision:	2.8
Committed:	Sat Feb 22 02:07:22 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.7:	+90 -6 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	User	Rev	Content
1	greg	2.8	/* RCSid: $Id$ */
2	greg	1.1	/*
3	greg	1.4	* random.h - header file for random(3) and urand() function.
4	greg	2.8	*/
5
6			/* ====================================================================
7			* The Radiance Software License, Version 1.0
8			*
9			* Copyright (c) 1990 - 2002 The Regents of the University of California,
10			* through Lawrence Berkeley National Laboratory. All rights reserved.
11			*
12			* Redistribution and use in source and binary forms, with or without
13			* modification, are permitted provided that the following conditions
14			* are met:
15			*
16			* 1. Redistributions of source code must retain the above copyright
17			* notice, this list of conditions and the following disclaimer.
18	greg	1.1	*
19	greg	2.8	* 2. Redistributions in binary form must reproduce the above copyright
20			* notice, this list of conditions and the following disclaimer in
21			* the documentation and/or other materials provided with the
22			* distribution.
23			*
24			* 3. The end-user documentation included with the redistribution,
25			* if any, must include the following acknowledgment:
26			* "This product includes Radiance software
27			* (http://radsite.lbl.gov/)
28			* developed by the Lawrence Berkeley National Laboratory
29			* (http://www.lbl.gov/)."
30			* Alternately, this acknowledgment may appear in the software itself,
31			* if and wherever such third-party acknowledgments normally appear.
32			*
33			* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
34			* and "The Regents of the University of California" must
35			* not be used to endorse or promote products derived from this
36			* software without prior written permission. For written
37			* permission, please contact [email protected].
38			*
39			* 5. Products derived from this software may not be called "Radiance",
40			* nor may "Radiance" appear in their name, without prior written
41			* permission of Lawrence Berkeley National Laboratory.
42			*
43			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
44			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
45			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
46			* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
47			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
50			* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
51			* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
52			* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
53			* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54			* SUCH DAMAGE.
55			* ====================================================================
56			*
57			* This software consists of voluntary contributions made by many
58			* individuals on behalf of Lawrence Berkeley National Laboratory. For more
59			* information on Lawrence Berkeley National Laboratory, please see
60			* <http://www.lbl.gov/>.
61	greg	1.1	*/
62
63	greg	2.8	#ifdef NORANDOM
64
65			#undef random
66			#define random() 1073741820
67			#undef srandom
68			#define srandom(s) (s)
69			#define frandom() 0.5
70			#define urand(i) 0.5
71			#define initurand(n) (n)
72
73			#else
74
75	greg	2.2	#ifdef MSDOS
76	greg	1.3
77	greg	2.3	#define random() ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4)
78	gwlarson	2.7	#define srandom(s) srand((unsigned)(s))
79	greg	2.2
80			#define frandom() (rand()*(1./32768.))
81
82			#else
83			#ifdef BSD
84
85	greg	1.1	extern long random();
86
87	greg	2.2	#define frandom() (random()*(1./2147483648.))
88	greg	1.3
89			#else
90
91			extern long lrand48();
92			extern double drand48();
93
94	greg	2.2	#define random() lrand48()
95	gwlarson	2.7	#define srandom(s) srand48((long)(s))
96	greg	2.2	#define frandom() drand48()
97	greg	1.3
98			#endif
99	greg	2.2	#endif
100	greg	1.4
101	greg	2.4	#ifdef MC
102	gregl	2.5
103	greg	2.4	#define urand(i) frandom()
104	gregl	2.5	#define initurand(n) (n)
105
106	greg	2.4	#else
107	gregl	2.5
108	gregl	2.6	extern unsigned short *urperm;
109	greg	2.8	extern int urmask;
110	gregl	2.5
111	greg	2.2	#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1))
112	greg	2.8
113			#endif
114
115			#endif
116
117			#ifdef NOPROTO
118
119			extern int initurand();
120			extern int ilhash();
121			extern int urind();
122			extern void multisamp();
123
124			#else
125			/* defined in urand.c */
126			extern int initurand(int size);
127			extern int ilhash(int *d, int n);
128			/* defined in urind.c */
129			extern int urind(int s, int i);
130			/* defined in multisamp.c */
131			extern void multisamp(double t[], int n, double r);
132	gregl	2.5
133	greg	2.4	#endif