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root/radiance/ray/src/common/urand.c
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Comparing ray/src/common/urand.c (file contents):
Revision 2.9 by greg, Sun May 16 14:49:42 2004 UTC vs.
Revision 2.10 by greg, Wed Apr 5 06:22:56 2006 UTC

# Line 16 | Line 16 | static const char      RCSid[] = "$Id$";
16  
17   #define  MAXORDER       (8*sizeof(unsigned short))
18  
19 < unsigned short  *urperm = NULL; /* urand() permutation */
20 < int  urmask;            /* bits used in permutation */
19 > static unsigned short  empty_tab = 0;
20  
21 + unsigned short  *urperm = &empty_tab;   /* urand() permutation */
22 + int  urmask = 0;                        /* bits used in permutation */
23 +
24   int
25   initurand(size)         /* initialize urand() for size entries */
26   int  size;
# Line 26 | Line 28 | int  size;
28          int  order, n;
29          register int  i, offset;
30  
31 <        if (urperm != NULL)
31 >        if ((urperm != NULL) & (urperm != &empty_tab))
32                  free((void *)urperm);
33          if (--size <= 0) {
34 <                urperm = NULL;
34 >                empty_tab = 0;
35 >                urperm = &empty_tab;
36                  urmask = 0;
37                  return(0);
38          }
# Line 61 | Line 64 | ilhash(d, n)                   /* hash a set of integer values */
64   register int  *d;
65   register int  n;
66   {
67 <        static int  tab[8] = {13623,353,1637,5831,2314,3887,5832,8737};
67 >        static int  tab[8] = {103699,96289,73771,65203,81119,87037,92051,98899};
68          register int  hval;
69  
70          hval = 0;
71          while (n-- > 0)
72 <                hval += *d++ * tab[n&7];
73 <        return(hval);
72 >                hval ^= *d++ * tab[n&7];
73 >        return(hval & 0x7fffffff);
74   }

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