--- ray/src/hd/rhdriver.h	1997/11/20 18:06:16	3.2
+++ ray/src/hd/rhdriver.h	1997/12/11 09:34:51	3.7
@@ -17,9 +17,13 @@ extern struct driver {
 
 			/* dev_input() return flags */
 #define	DEV_SHUTDOWN	01	/* user shutdown request */
-#define DEV_NEWVIEW	02	/* view change (new view in odev.v) */
-#define DEV_NEWSIZE	04	/* device resolution change */
-#define DEV_WAIT	010	/* pause computation and wait for input */
+#define	DEV_NEWVIEW	02	/* view change (new view in odev.v) */
+#define	DEV_NEWSIZE	04	/* device resolution change */
+#define	DEV_WAIT	010	/* pause computation and wait for input */
+#define	DEV_RESUME	020	/* resume after pause */
+#define	DEV_REDRAW	040	/* redraw from server */
+#define DEV_PUTVIEW	0100	/* print out current view */
+#define DEV_LASTVIEW	0200	/* restore previous view */
 
 
 /************************************************************************
@@ -35,19 +39,23 @@ The view type, horizontal and vertical view angles and
 parameters in odev.v should also be assigned.
 
 
-void
+int
 dev_view(nv)		: set display view parameters
 VIEW	*nv;		: the new view
 
 Updates the display for the given view change.
 Look for nv==&odev.v when making view current after dev_input()
-returns DEV_NEWVIEW flag.
+returns DEV_NEWVIEW flag.  Return 1 on success, or 0 if the
+new view would conflict with device requirements.  In the latter
+case, reset parameters in nv to make it more agreeable, calling
+error(COMMAND, "appropriate user warning").
 
 
 void
-dev_value(c, p)		: register new point of light
+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.