--- ray/src/common/random.h	1990/12/04 11:23:58	1.3
+++ ray/src/common/random.h	2022/04/21 02:52:40	2.24
@@ -1,25 +1,54 @@
-/* Copyright (c) 1986 Regents of the University of California */
-
-/* SCCSid "$SunId$ LBL" */
-
+/* RCSid $Id: random.h,v 2.24 2022/04/21 02:52:40 greg Exp $ */
 /*
- *  random.h - header file for random(3) function.
- *
- *     10/1/85
+ *  random.h - header file for random(3) and urand() function.
  */
+#ifndef _RAD_RANDOM_H_
+#define _RAD_RANDOM_H_
 
-#ifdef  BSD
+#include <stdlib.h>
 
-extern long  random();
+#ifdef __cplusplus
+extern "C" {
+#endif
 
-#define  frandom()	(random()*(1./2147483648.))
+#if defined(_WIN32) || defined(_WIN64)
+#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+.5)))
+
 #else
 
-extern long  lrand48();
-extern double  drand48();
+#define	 random()	lrand48()
+#define  srandom(s)	srand48((long)(s))
+#define	 frandom()	drand48()
 
-#define  random()	lrand48()
-#define  frandom()	drand48()
+#endif
 
+extern unsigned short	*urperm;
+extern int	urmask;
+
+#define	 urand(i)	(urmask ? (urperm[(i)&urmask]+frandom())/(urmask+1.) \
+				: frandom())
+
+				/* defined in urand.c */
+extern long	irandom(long modulus);
+
+extern int	initurand(int size);
+
+extern int	ilhash(int *d, int n);
+
+extern int	urind(int s, int i);
+				/* defined in multisamp.c */
+extern void	multisamp(double t[], int n, double r);
+
+
+#ifdef __cplusplus
+}
 #endif
+#endif /* _RAD_RANDOM_H_ */
+