--- ray/src/hd/rhdisp.c	1997/12/11 09:37:43	3.12
+++ ray/src/hd/rhdisp.c	1997/12/18 18:14:15	3.16
@@ -15,7 +15,7 @@ static char SCCSid[] = "$SunId$ SGI";
 #include <ctype.h>
 
 #ifndef VIEWHISTLEN
-#define VIEWHISTLEN	2	/* number of remembered views */
+#define VIEWHISTLEN	4	/* number of remembered views */
 #endif
 
 HOLO	*hdlist[HDMAX+1];	/* global holodeck list */
@@ -58,22 +58,32 @@ char	*argv[];
 		rdy = disp_wait();
 		if (rdy & RDY_DEV) {		/* user input from driver */
 			inp = dev_input();
-			if (inp & DEV_PUTVIEW)
-				printview();
-			if (inp & DEV_NEWVIEW)
+			if (inp & DFL(DC_SETVIEW))
 				new_view(&odev.v);
-			if (inp & DEV_LASTVIEW)
+			if (inp & DFL(DC_GETVIEW))
+				printview();
+			if (inp & DFL(DC_LASTVIEW))
 				new_view(NULL);
-			if (inp & DEV_SHUTDOWN)
-				serv_request(DR_SHUTDOWN, 0, NULL);
-			if (inp & DEV_REDRAW)
-				imm_mode = beam_sync() > 0;
-			if (inp & DEV_WAIT)
-				pause = 1;
-			if (inp & DEV_RESUME) {
+			if (inp & DFL(DC_RESUME)) {
 				serv_request(DR_NOOP, 0, NULL);
 				pause = 0;
 			}
+			if (inp & DFL(DC_PAUSE))
+				pause = 1;
+			if (inp & DFL(DC_REDRAW))
+				imm_mode = beam_sync() > 0;
+			if (inp & DFL(DC_KILL)) {
+				serv_request(DR_KILL, 0, NULL);
+				pause = 0;
+			}
+			if (inp & DFL(DC_CLOBBER))
+				serv_request(DR_CLOBBER, 0, NULL);
+			if (inp & DFL(DC_RESTART)) {
+				serv_request(DR_RESTART, 0, NULL);
+				pause = 0;
+			}
+			if (inp & DFL(DC_QUIT))
+				serv_request(DR_SHUTDOWN, 0, NULL);
 		}
 		if (rdy & RDY_SIN)		/* user input from sstdin */
 			switch (usr_input()) {
@@ -82,6 +92,9 @@ char	*argv[];
 				break;
 			case DC_RESUME:
 				serv_request(DR_NOOP, 0, NULL);
+				/* fall through */
+			case DC_KILL:
+			case DC_RESTART:
 				pause = 0;
 				break;
 			}
@@ -201,11 +214,11 @@ register VIEW	*v;
 	char	*err;
 				/* restore previous view? */
 	if (v == NULL) {
-		if (nhist < 2) {
-			error(COMMAND, "no previous view");
-			return;
-		}
-		nhist--;	/* get one before last setting */
+		if (nhist > 1)		/* get one before last setting */
+			nhist--;
+		else			/* else go to end of list */
+			while (nhist < VIEWHISTLEN && viewhist[nhist].type)
+				nhist++;
 		v = viewhist + ((nhist-1)%VIEWHISTLEN);
 	} else if ((err = setview(v)) != NULL) {
 		error(COMMAND, err);
@@ -272,6 +285,18 @@ usr_input()			/* get user input and process it */
 	case DC_PAUSE:			/* pause the current calculation */
 	case DC_RESUME:			/* resume the calculation */
 		/* handled in main() */
+		break;
+	case DC_REDRAW:			/* redraw from server */
+		imm_mode = beam_sync() > 0;
+		break;
+	case DC_KILL:			/* kill rtrace process(es) */
+		serv_request(DR_KILL, 0, NULL);
+		break;
+	case DC_CLOBBER:		/* clobber holodeck */
+		serv_request(DR_CLOBBER, 0, NULL);
+		break;
+	case DC_RESTART:		/* restart rtrace */
+		serv_request(DR_RESTART, 0, NULL);
 		break;
 	case DC_QUIT:			/* quit request */
 		serv_request(DR_SHUTDOWN, 0, NULL);