--- ray/src/common/random.h	1989/02/02 10:34:21	1.1
+++ ray/src/common/random.h	2003/03/27 16:33:38	2.10
@@ -1,13 +1,82 @@
-/* Copyright (c) 1986 Regents of the University of California */
-
-/* SCCSid "$SunId$ LBL" */
-
+/* RCSid $Id: random.h,v 2.10 2003/03/27 16:33:38 greg Exp $ */
 /*
- *  random.h - header file for random(3) function.
- *
- *     10/1/85
+ *  random.h - header file for random(3) and urand() function.
  */
 
+#include "copyright.h"
+
+#ifdef  NORANDOM
+
+#undef  random
+#define  random()	1073741820
+#undef  srandom
+#define  srandom(s)	(s)
+#define  frandom()	0.5
+#define  urand(i)	0.5
+#define  initurand(n)	(n)
+
+#else
+
+#ifdef	MSDOS
+
+#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()/2147483648.0)
+#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
+
+#ifdef  MC
+
+#define  urand(i)	frandom()
+#define  initurand(n)	(n)
+
+#else
+
+extern unsigned short	*urperm;
+extern int	urmask;
+
+#define	 urand(i)	((urperm[(i)&urmask]+frandom())/(urmask+1))
+
+#endif
+
+#endif
+
+#ifdef NOPROTO
+
+extern int	initurand();
+extern int	ilhash();
+extern int	urind();
+extern void	multisamp();
+
+#else
+				/* defined in urand.c */
+extern int	initurand(int size);
+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);
+
+#endif