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root/Development/ray/src/common/urand.c

Comparing ray/src/common/urand.c (file contents):
Revision 1.2 by greg, Fri May 17 13:51:14 1991 UTC vs.
Revision 1.7 by greg, Mon Aug 12 13:07:02 1991 UTC

#	Line 5 | Line 5 | static char SCCSid[] = "$SunId$ LBL";
5		#endif
6
7		/*
8	<	* Uncorrelated (anticorrelated) random function
8	>	* Anticorrelated random function due to Christophe Schlick
9		*/
10
11		#include  "random.h"
#	Line 16 | Line 16 | extern char  *malloc();
16
17		short  *urperm;         /* urand() permutation */
18		int  urmask;            /* bits used in permutation */
19	–	static int  urorder;    /* number of bits */
19
20
21		initurand(size)         /* initialize urand() for size entries */
#	Line 49 | Line 48 | int  size;
48
49
50		int
51	<	urhash(d, n)                    /* hash a set of integer values */
51	>	ilhash(d, n)                    /* hash a set of integer values */
52		register int  *d;
53		register int  n;
54		{
55		static int  tab[8] = {13623,353,1637,5831,2314,3887,5832,8737};
56	<	register unsigned  hval;
56	>	register int  hval;
57
58		hval = 0;
59		while (n-- > 0)
60		hval += *d++ * tab[n&7];
61	<	return(hval & urmask);
61	>	return(hval);
62		}

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