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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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* Uncorrelated (anticorrelated) random function |
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* Anticorrelated random function due to Christophe Schlick |
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*/ |
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#include "random.h" |
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extern char *malloc(); |
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short *urperm; /* urand() permutation */ |
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short *urperm = NULL; /* urand() permutation */ |
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int urmask; /* bits used in permutation */ |
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int |
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initurand(size) /* initialize urand() for size entries */ |
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int size; |
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{ |
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int order, n; |
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register int i, offset; |
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if (urperm != NULL) |
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free((char *)urperm); |
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size--; |
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for (i = 1; size >>= 1; i++) |
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; |
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else |
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urperm[i+offset]++; |
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} |
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return(1<<order); |
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} |
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