--- ray/src/hd/rhdriver.h	1998/06/17 15:44:07	3.14
+++ ray/src/hd/rhdriver.h	1998/08/19 17:43:08	3.16
@@ -13,6 +13,7 @@ extern struct driver {
 	VIEW	v;		/* base view parameters */
 	int	hres, vres;	/* base view resolution */
 	int	ifd;		/* input file descriptor (for select) */
+	int	inpready;	/* number of unprocessed input events */
 } odev;			/* our open device */
 
 extern int	imm_mode;	/* bundles are being delivered immediately */
@@ -77,20 +78,21 @@ the screen is optional.
 
 
 void
-dev_value(c, p, v)	: register new point of light
+dev_value(c, d, p)	: register new point of light
 COLR	c;		: pixel color (RGBE)
+FVECT	d;		: ray direction vector
 FVECT	p;		: world intersection point
-FVECT	v;		: ray direction vector
 
 Add the given color point to the display output queue.  If imm_mode is
-non-zero, then values are being sent in rapid succession.
+non-zero, then values are being sent in rapid succession.  If p is NULL,
+then the point is at infinity.
 
 
 int
 dev_flush()		: flush the output and prepare for select call
 
 Updates display, taking any pending action required before select(2) call.
-Returns non-zero if there is device input available.
+Returns non-zero if there is device input available, setting odev.inpready.
 
 
 int
@@ -99,7 +101,8 @@ dev_input()		: process pending display input
 Called when odev struct file descriptor shows input is ready.
 Returns flags indicating actions to take in the control process.
 If the DC_VIEW or DC_RESIZE flag is returned, the odev
-structure must be updated beforehand.
+structure must be updated beforehand.  No events will be
+ready when this function returns, and odev.inpready will be 0.
 
 void
 dev_auxcom(cmd, args)	: process auxiliary command