--- ray/src/common/random.h	1990/12/04 11:23:58	1.3
+++ ray/src/common/random.h	1996/02/13 11:32:17	2.4
@@ -1,25 +1,42 @@
-/* Copyright (c) 1986 Regents of the University of California */
+/* Copyright (c) 1992 Regents of the University of California */
 
 /* SCCSid "$SunId$ LBL" */
 
 /*
- *  random.h - header file for random(3) function.
+ *  random.h - header file for random(3) and urand() function.
  *
  *     10/1/85
  */
 
-#ifdef  BSD
+#ifdef	MSDOS
 
+#define random()	((long)rand()<<16^(long)rand()<<6^(long)rand()>>4)
+
+#define frandom()	(rand()*(1./32768.))
+
+#else
+#ifdef	BSD
+
 extern long  random();
 
-#define  frandom()	(random()*(1./2147483648.))
+#define	 frandom()	(random()*(1./2147483648.))
 
 #else
 
 extern long  lrand48();
 extern double  drand48();
 
-#define  random()	lrand48()
-#define  frandom()	drand48()
+#define	 random()	lrand48()
+#define	 frandom()	drand48()
 
 #endif
+#endif
+
+#ifdef  MC
+#define  urand(i)	frandom()
+#else
+#define	 urand(i)	((urperm[(i)&urmask]+frandom())/(urmask+1))
+#endif
+
+extern short  *urperm;
+extern int  urmask;