--- ray/src/hd/rhdriver.h	1997/12/14 09:45:48	3.10
+++ ray/src/hd/rhdriver.h	1998/01/06 05:26:20	3.12
@@ -15,6 +15,8 @@ extern struct driver {
 	int	ifd;		/* input file descriptor (for select) */
 } odev;			/* our open device */
 
+extern int	imm_mode;	/* bundles are being delivered immediately */
+
 				/* user commands */
 #define	DC_SETVIEW	0		/* set the view */
 #define	DC_GETVIEW	1		/* print the current view */
@@ -66,12 +68,20 @@ error(COMMAND, "appropriate user warning").
 
 
 void
+dev_clear()		: clear device memory
+
+Clear the device memory in preparation for fresh data.  Clearing
+the screen is optional.
+
+
+void
 dev_value(c, p, v)	: register new point of light
 COLR	c;		: pixel color (RGBE)
 FVECT	p;		: world intersection point
 FVECT	v;		: ray direction vector
 
-Add the given color point to the display output queue.
+Add the given color point to the display output queue.  If imm_mode is
+non-zero, then values are being sent in rapid succession.
 
 
 int