--- ray/src/hd/rholo4.c	1998/01/04 18:37:11	3.17
+++ ray/src/hd/rholo4.c	1998/12/20 20:39:31	3.24
@@ -1,4 +1,4 @@
-/* Copyright (c) 1997 Silicon Graphics, Inc. */
+/* Copyright (c) 1998 Silicon Graphics, Inc. */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ SGI";
@@ -16,6 +16,10 @@ static char SCCSid[] = "$SunId$ SGI";
 #define HDSUF	".hdi"
 #endif
 
+#ifndef FNONBLK
+#define FNONBLK		O_NONBLOCK
+#endif
+
 static int	inp_flags;
 static int	dpd[3];
 static FILE	*dpout;
@@ -24,13 +28,13 @@ static FILE	*dpout;
 disp_open(dname)		/* open the named display driver */
 char	*dname;
 {
-	char	dpath[128], fd0[8], fd1[8], *cmd[5];
-	int	i;
+	char	buf[128], fd0[8], fd1[8], *cmd[5], *sfn;
+	int	i, n, len;
 				/* get full display program name */
 #ifdef DEVPATH
-	sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
+	sprintf(buf, "%s/%s%s", DEVPATH, dname, HDSUF);
 #else
-	sprintf(dpath, "dev/%s%s", dname, HDSUF);
+	sprintf(buf, "dev/%s%s", dname, HDSUF);
 #endif
 				/* dup stdin and stdout */
 	if (readinp)
@@ -39,7 +43,7 @@ char	*dname;
 		strcpy(fd0, "-1");
 	sprintf(fd1, "%d", dup(1));
 				/* start the display process */
-	cmd[0] = dpath;
+	cmd[0] = buf;
 	cmd[1] = froot; cmd[2] = fd1; cmd[3] = fd0;
 	cmd[4] = NULL;
 	i = open_process(dpd, cmd);
@@ -56,9 +60,26 @@ char	*dname;
 				/* check if outside */
 	if (vdef(OBSTRUCTIONS) && vbool(OBSTRUCTIONS))
 		disp_result(DS_OUTSECT, 0, NULL);
-				/* write out hologram grids */
-	for (i = 0; hdlist[i] != NULL; i++)
-		disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
+				/* send eye separation if specified */
+	if (vdef(EYESEP)) {
+		sprintf(buf, "%.9e", vflt(EYESEP));
+		disp_result(DS_EYESEP, strlen(buf)+1, buf);
+	}
+				/* write out hologram grids & octrees */
+	for (i = 0; hdlist[i] != NULL; i++) {
+		bcopy((char *)hdlist[i], buf, sizeof(HDGRID));
+		len = sizeof(HDGRID);
+		n = vdef(GEOMETRY);
+		sfn = i<n ? nvalue(GEOMETRY,i) :
+				n ? nvalue(GEOMETRY,n-1) : vval(OCTREE);
+		strcpy(buf+len, sfn);
+		len += strlen(sfn) + 1;
+		n = vdef(PORTS);
+		sfn = i<n ? nvalue(PORTS,i) : n ? nvalue(PORTS,n-1) : "";
+		strcpy(buf+len, sfn);
+		len += strlen(sfn) + 1;
+		disp_result(DS_ADDHOLO, len, buf);
+	}
 	disp_flush();
 }
 
@@ -99,10 +120,12 @@ int	block;
 		return(2);		/* acceptable failure */
 	}
 	if (msg.nbytes) {		/* get the message body */
+		if (msg.nbytes < 0)
+			error(INTERNAL, "anti-message from display process");
 		buf = (char *)malloc(msg.nbytes);
 		if (buf == NULL)
 			error(SYSTEM, "out of memory in disp_check");
-		if (fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
+		if (inp_flags != 0 && fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
 			goto fcntlerr;
 		if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
 			goto readerr;
@@ -116,12 +139,17 @@ int	block;
 	case DR_NEWSET:		/* new calculation set */
 		if (msg.nbytes % sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_NEWSET from display process");
-		disp_result(DS_STARTIMM, 0, NULL);
+		if (msg.nbytes)
+			disp_result(DS_STARTIMM, 0, NULL);
 		bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
-		disp_result(DS_ENDIMM, 0, NULL);
-		disp_flush();
+		if (msg.nbytes) {
+			disp_result(DS_ENDIMM, 0, NULL);
+			disp_flush();
+		}
 		break;
 	case DR_ADDSET:		/* add to calculation set */
+		if (!msg.nbytes)
+			break;
 		if (msg.nbytes % sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_ADDSET from display process");
 		disp_result(DS_STARTIMM, 0, NULL);
@@ -130,6 +158,8 @@ int	block;
 		disp_flush();
 		break;
 	case DR_ADJSET:		/* adjust calculation set members */
+		if (!msg.nbytes)
+			break;
 		if (msg.nbytes % sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_ADJSET from display process");
 		disp_result(DS_STARTIMM, 0, NULL);
@@ -138,10 +168,17 @@ int	block;
 		disp_flush();
 		break;
 	case DR_DELSET:		/* delete from calculation set */
+		if (!msg.nbytes)
+			break;
 		if (msg.nbytes % sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_DELSET from display process");
 		bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
 		break;
+	case DR_VIEWPOINT:	/* set target eye position */
+		if (msg.nbytes != sizeof(VIEWPOINT))
+			error(INTERNAL, "bad DR_VIEWPOINT from display process");
+		copystruct(&myeye, (VIEWPOINT *)buf);
+		break;
 	case DR_ATTEN:		/* block for priority request */
 		if (msg.nbytes)
 			error(INTERNAL, "bad DR_ATTEN from display process");
@@ -202,6 +239,7 @@ disp_close()			/* close our display process */
 
 	if (dpout == NULL)
 		return(-1);
+	myeye.rng = 0;
 	disp_result(DS_SHUTDOWN, 0, NULL);
 	fclose(dpout);
 	dpout = NULL;
@@ -214,7 +252,11 @@ int	type, nbytes;
 char	*p;
 {
 	MSGHEAD	msg;
-
+					/* consistency checks */
+#ifdef DEBUG
+	if (nbytes < 0 || nbytes > 0 & p == NULL)
+		error(CONSISTENCY, "bad buffer handed to disp_result");
+#endif
 	if (dpout == NULL)
 		return;
 	msg.type = type;