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root/radiance/ray/src/common/random.h
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Comparing ray/src/common/random.h (file contents):
Revision 1.3 by greg, Tue Dec 4 11:23:58 1990 UTC vs.
Revision 2.15 by greg, Mon Jun 13 20:07:56 2005 UTC

# Line 1 | Line 1
1 < /* Copyright (c) 1986 Regents of the University of California */
2 <
3 < /* SCCSid "$SunId$ LBL" */
4 <
1 > /* RCSid $Id$ */
2   /*
3 < *  random.h - header file for random(3) function.
7 < *
8 < *     10/1/85
3 > *  random.h - header file for random(3) and urand() function.
4   */
5 + #ifndef _RAD_RANDOM_H_
6 + #define _RAD_RANDOM_H_
7 + #ifdef __cplusplus
8 + extern "C" {
9 + #endif
10  
11 < #ifdef  BSD
11 > #ifdef  _WIN32
12  
13 + #if (RAND_MAX <= 65536)
14 + #define random()        ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4)
15 + #else
16 + #define random()        rand()
17 + #endif
18 + #define srandom(s)      srand((unsigned)(s))
19 +
20 + #define frandom()       (rand()*(1./RAND_MAX))
21 +
22 + #else
23 + #ifdef  BSD
24 +
25   extern long  random();
26  
27 < #define  frandom()      (random()*(1./2147483648.))
27 > #define  frandom()      (random()*(1./2147483648.))
28  
29   #else
30  
31   extern long  lrand48();
32   extern double  drand48();
33  
34 < #define  random()       lrand48()
35 < #define  frandom()      drand48()
34 > #define  random()       lrand48()
35 > #define  srandom(s)     srand48((long)(s))
36 > #define  frandom()      drand48()
37  
38   #endif
39 + #endif
40 +
41 + extern unsigned short   *urperm;
42 + extern int      urmask;
43 +
44 + #define  urand(i)       ((urperm[(i)&urmask]+frandom())/(urmask+1))
45 +
46 + extern int      initurand(int size);
47 +
48 +                                /* 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 +
55 +
56 + #ifdef __cplusplus
57 + }
58 + #endif
59 + #endif /* _RAD_RANDOM_H_ */
60 +

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