src/common/random.h

/* RCSid $Id: random.h,v 2.14 2003/06/29 16:51:48 greg Exp $ */
/*
 *  random.h - header file for random(3) and urand() function.
 */
#ifndef _RAD_RANDOM_H_
#define _RAD_RANDOM_H_
#ifdef __cplusplus
extern "C" {
#endif

#ifdef  _WIN32

#if (RAND_MAX <= 65536)
#define random()        ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4)
#else
#define random()        rand()
#endif
#define srandom(s)      srand((unsigned)(s))

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

#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

extern unsigned short   *urperm;
extern int      urmask;

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

extern int      initurand(int size);

                                /* defined in urand.c */
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);


#ifdef __cplusplus
}
#endif
#endif /* _RAD_RANDOM_H_ */

Revision:	2.15
Committed:	Mon Jun 13 20:07:56 2005 UTC (18 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1
Changes since 2.14:	+1 -24 lines
Log Message:	Added -R option for pure Monte Carlo rendering, replacing -DMC compile option
#	User	Rev	Content
1	greg	2.15	/* RCSid $Id: random.h,v 2.14 2003/06/29 16:51:48 greg Exp $ */
2	greg	1.1	/*
3	greg	1.4	* random.h - header file for random(3) and urand() function.
4	greg	2.8	*/
5	schorsch	2.12	#ifndef _RAD_RANDOM_H_
6			#define _RAD_RANDOM_H_
7			#ifdef __cplusplus
8			extern "C" {
9			#endif
10	greg	1.1
11	schorsch	2.11	#ifdef _WIN32
12	greg	1.3
13	greg	2.10	#if (RAND_MAX <= 65536)
14	greg	2.3	#define random() ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4)
15	greg	2.10	#else
16			#define random() rand()
17			#endif
18	gwlarson	2.7	#define srandom(s) srand((unsigned)(s))
19	greg	2.2
20	greg	2.10	#define frandom() (rand()*(1./RAND_MAX))
21	greg	2.2
22			#else
23			#ifdef BSD
24
25	greg	1.1	extern long random();
26
27	greg	2.2	#define frandom() (random()*(1./2147483648.))
28	greg	1.3
29			#else
30
31			extern long lrand48();
32			extern double drand48();
33
34	greg	2.2	#define random() lrand48()
35	gwlarson	2.7	#define srandom(s) srand48((long)(s))
36	greg	2.2	#define frandom() drand48()
37	greg	1.3
38			#endif
39	greg	2.2	#endif
40	greg	1.4
41	gregl	2.6	extern unsigned short *urperm;
42	greg	2.8	extern int urmask;
43	gregl	2.5
44	greg	2.2	#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1))
45	greg	2.8
46	greg	2.14	extern int initurand(int size);
47
48	greg	2.8	/* defined in urand.c */
49			extern int ilhash(int *d, int n);
50			/* defined in urind.c */
51			extern int urind(int s, int i);
52			/* defined in multisamp.c */
53			extern void multisamp(double t[], int n, double r);
54	gregl	2.5
55	schorsch	2.12
56			#ifdef __cplusplus
57			}
58	greg	2.4	#endif
59	schorsch	2.12	#endif /* _RAD_RANDOM_H_ */
60