src/hd/rhdisp.c

/* Copyright (c) 1997 Silicon Graphics, Inc. */

#ifndef lint
static char SCCSid[] = "$SunId$ SGI";
#endif

/*
 * Holodeck display process.
 */

#include "rholo.h"
#include "rhdisp.h"
#include "rhdriver.h"
#include "selcall.h"
#include <ctype.h>

#ifndef VIEWHISTLEN
#define VIEWHISTLEN     4       /* number of remembered views */
#endif

HOLO    *hdlist[HDMAX+1];       /* global holodeck list */

char    cmdlist[DC_NCMDS][8] = DC_INIT;

int     imm_mode = 0;           /* bundles are being delivered immediately */

char    *progname;              /* global argv[0] */

FILE    *sstdin, *sstdout;      /* server's standard input and output */

#define RDY_SRV         01
#define RDY_DEV         02
#define RDY_SIN         04


main(argc, argv)
int     argc;
char    *argv[];
{
        extern int      eputs();
        int     rdy, inp, res = 0, pause = 0;

        progname = argv[0];
        if (argc < 3)
                error(USER, "bad command line arguments");
                                        /* open our device */
        dev_open(argv[1]);
                                        /* open server process i/o */
        sstdout = fdopen(atoi(argv[2]), "w");
        if (argc < 4 || (inp = atoi(argv[3])) < 0)
                sstdin = NULL;
        else
                sstdin = fdopen(inp, "r");
                                        /* set command error vector */
        erract[COMMAND].pf = eputs;
                                        /* enter main loop */
        do {
                rdy = disp_wait();
                if (rdy & RDY_DEV) {            /* user input from driver */
                        inp = dev_input();
                        if (inp & DFL(DC_SETVIEW))
                                new_view(&odev.v);
                        if (inp & DFL(DC_GETVIEW))
                                printview();
                        if (inp & DFL(DC_LASTVIEW))
                                new_view(NULL);
                        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()) {
                        case DC_PAUSE:
                                pause = 1;
                                break;
                        case DC_RESUME:
                                serv_request(DR_NOOP, 0, NULL);
                                /* fall through */
                        case DC_KILL:
                        case DC_RESTART:
                                pause = 0;
                                break;
                        }
                if (rdy & RDY_SRV) {            /* process server result */
                        res = serv_result();
                        if (pause && res != DS_SHUTDOWN) {
                                serv_request(DR_ATTEN, 0, NULL);
                                while ((res = serv_result()) != DS_ACKNOW &&
                                                res != DS_SHUTDOWN)
                                        ;
                        }
                }
        } while (res != DS_SHUTDOWN);
                                        /* all done */
        quit(0);
}


int
disp_wait()                     /* wait for more input */
{
        fd_set  readset, errset;
        int     flgs;
        int     n;
        register int    i;
                                /* see if we can avoid select call */
        if (imm_mode || stdin->_cnt > 0)
                return(RDY_SRV);
        if (sstdin != NULL && sstdin->_cnt > 0)
                return(RDY_SIN);
        if (dev_flush())
                return(RDY_DEV);
                                /* make the call */
        FD_ZERO(&readset); FD_ZERO(&errset);
        FD_SET(0, &readset);
        FD_SET(0, &errset);
        FD_SET(odev.ifd, &readset);
        FD_SET(odev.ifd, &errset);
        n = odev.ifd+1;
        if (sstdin != NULL) {
                FD_SET(fileno(sstdin), &readset);
                if (fileno(sstdin) >= n)
                        n = fileno(sstdin) + 1;
        }
        n = select(n, &readset, NULL, &errset, NULL);
        if (n < 0) {
                if (errno == EINTR)
                        return(0);
                error(SYSTEM, "select call failure in disp_wait");
        }
        flgs = 0;               /* flag what's ready */
        if (FD_ISSET(0, &readset) || FD_ISSET(0, &errset))
                flgs |= RDY_SRV;
        if (FD_ISSET(odev.ifd, &readset) || FD_ISSET(odev.ifd, &errset))
                flgs |= RDY_DEV;
        if (sstdin != NULL && FD_ISSET(fileno(sstdin), &readset))
                flgs |= RDY_SIN;
        return(flgs);
}


add_holo(hdg)                   /* register a new holodeck section */
HDGRID  *hdg;
{
        VIEW    nv;
        register int    hd;

        for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
                ;
        if (hd >= HDMAX)
                error(INTERNAL, "too many holodeck sections in add_holo");
        hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
        if (hdlist[hd] == NULL)
                error(SYSTEM, "out of memory in add_holo");
        bcopy((char *)hdg, (char *)hdlist[hd], sizeof(HDGRID));
        hdcompgrid(hdlist[hd]);
        if (hd)
                return;
                                        /* set initial viewpoint */
        copystruct(&nv, &odev.v);
        VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
        VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
        VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
        fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
        VCOPY(nv.vup, hdlist[0]->xv[2]);
        new_view(&nv);
}


disp_bundle(p)                  /* display a ray bundle */
register PACKHEAD       *p;
{
        GCOORD  gc[2];
        FVECT   ro, rd, wp;
        double  d;
        register int    i;
                                        /* get beam coordinates */
        if (p->hd < 0 | p->hd >= HDMAX || hdlist[p->hd] == NULL)
                error(INTERNAL, "bad holodeck number in disp_bundle");
        if (!hdbcoord(gc, hdlist[p->hd], p->bi))
                error(INTERNAL, "bad beam index in disp_bundle");
                                        /* display each ray */
        for (i = p->nr; i--; ) {
                hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
                d = hddepth(hdlist[p->hd], packra(p)[i].d);
                VSUM(wp, ro, rd, d);            /* might be behind viewpoint */
                dev_value(packra(p)[i].v, wp, rd);
        }
}


new_view(v)                     /* change view parameters */
register VIEW   *v;
{
        static VIEW     viewhist[VIEWHISTLEN];
        static unsigned nhist;
        char    *err;
                                /* restore previous view? */
        if (v == NULL) {
                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
again:
        if ((err = setview(v)) != NULL) {
                error(COMMAND, err);
                return;
        }
        if (v->type == VT_PAR) {
                error(COMMAND, "cannot handle parallel views");
                return;
        }
        if (!dev_view(v))       /* update display driver */
                goto again;
        dev_flush();            /* update screen */
        if (!beam_view(v))      /* update beam list */
                goto again;
                                /* record new view */
        if (v < viewhist || v >= viewhist+VIEWHISTLEN) {
                copystruct(viewhist + (nhist%VIEWHISTLEN), v);
                nhist++;
        }
}


int
usr_input()                     /* get user input and process it */
{
        VIEW    vparams;
        char    cmd[128];
        register char   *args;
        register int    i;

        if (fgets(cmd, sizeof(cmd), sstdin) == NULL)
                return(DC_QUIT);
        for (args = cmd; *args && !isspace(*args); args++)
                ;
        while (isspace(*args))
                *args++ = '\0';
        if (!*cmd)
                return(DC_RESUME);
        if (*args && args[i=strlen(args)-1] == '\n')
                args[i] = '\0';
        for (i = 0; i < DC_NCMDS; i++)
                if (!strcmp(cmd, cmdlist[i]))
                        break;
        if (i >= DC_NCMDS) {
                sprintf(errmsg, "unknown command: %s", cmd);
                error(COMMAND, errmsg);
                return(-1);
        }
        switch (i) {
        case DC_SETVIEW:                /* set the view */
                copystruct(&vparams, &odev.v);
                if (!sscanview(&vparams, args))
                        error(COMMAND, "missing view options");
                else
                        new_view(&vparams);
                break;
        case DC_GETVIEW:                /* print the current view */
                printview();
                break;
        case DC_LASTVIEW:               /* restore previous view */
                new_view(NULL);
                break;
        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);
                break;
        default:
                error(CONSISTENCY, "bad command id in usr_input");
        }
        return(i);
}


printview()                     /* print our current view to server stdout */
{
        fputs(VIEWSTR, sstdout);
        fprintview(&odev.v, sstdout);
        fputc('\n', sstdout);
        fflush(sstdout);
}


int
serv_result()                   /* get next server result and process it */
{
        static char     *buf = NULL;
        static int      bufsiz = 0;
        MSGHEAD msg;
        int     n;
                                        /* read message header */
        if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
                goto readerr;
        if (msg.nbytes > 0) {           /* get the message body */
                if (msg.nbytes > bufsiz) {
                        if (buf == NULL)
                                buf = (char *)malloc(bufsiz=msg.nbytes);
                        else
                                buf = (char *)realloc(buf, bufsiz=msg.nbytes);
                        if (buf == NULL)
                                error(SYSTEM, "out of memory in serv_result");
                }
                if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
                        goto readerr;
        }
        switch (msg.type) {             /* process results */
        case DS_BUNDLE:
                if (msg.nbytes < sizeof(PACKHEAD) ||
                                msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
                        error(INTERNAL, "bad display packet from server");
                disp_bundle((PACKHEAD *)buf);
                break;
        case DS_ADDHOLO:
                if (msg.nbytes != sizeof(HDGRID))
                        error(INTERNAL, "bad holodeck record from server");
                add_holo((HDGRID *)buf);
                break;
        case DS_STARTIMM:
        case DS_ENDIMM:
                imm_mode = msg.type==DS_STARTIMM;
                /* fall through */
        case DS_ACKNOW:
        case DS_SHUTDOWN:
                if (msg.nbytes) {
                        sprintf(errmsg,
                                "unexpected body with server message %d",
                                        msg.type);
                        error(INTERNAL, errmsg);
                }
                break;
        default:
                error(INTERNAL, "unrecognized result from server process");
        }
        return(msg.type);               /* return message type */
readerr:
        if (feof(stdin))
                error(SYSTEM, "server process died");
        error(SYSTEM, "error reading from server process");
}


serv_request(type, nbytes, p)   /* send a request to the server process */
int     type, nbytes;
char    *p;
{
        MSGHEAD msg;
        int     m;
                                /* get server's attention for big request */
        if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
                serv_request(DR_ATTEN, 0, NULL);
                while ((m = serv_result()) != DS_ACKNOW)
                        if (m == DS_SHUTDOWN)   /* the bugger quit on us */
                                quit(0);
        }
        msg.type = type;        /* write and flush the message */
        msg.nbytes = nbytes;
        fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
        if (nbytes > 0)
                fwrite(p, 1, nbytes, stdout);
        if (fflush(stdout) < 0)
                error(SYSTEM, "write error in serv_request");
}


eputs(s)                        /* put error message to stderr */
register char  *s;
{
        static int  midline = 0;

        if (!*s)
                return;
        if (!midline++) {       /* prepend line with program name */
                fputs(progname, stderr);
                fputs(": ", stderr);
        }
        fputs(s, stderr);
        if (s[strlen(s)-1] == '\n') {
                fflush(stderr);
                midline = 0;
        }
}


quit(code)                      /* clean up and exit */
int     code;
{
        if (odev.v.type)
                dev_close();
        exit(code);
}
Revision:	3.18
Committed:	Thu Jan 1 13:00:16 1998 UTC (27 years, 10 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 3.17:	+0 -2 lines
Log Message:	increased interactive update rate with periodic display flushing
#	User	Rev	Content
1	gregl	3.1	/* Copyright (c) 1997 Silicon Graphics, Inc. */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ SGI";
5			#endif
6
7			/*
8			* Holodeck display process.
9			*/
10
11			#include "rholo.h"
12			#include "rhdisp.h"
13			#include "rhdriver.h"
14			#include "selcall.h"
15	gregl	3.10	#include <ctype.h>
16	gregl	3.1
17	gregl	3.12	#ifndef VIEWHISTLEN
18	gregl	3.16	#define VIEWHISTLEN 4 /* number of remembered views */
19	gregl	3.12	#endif
20
21	gregl	3.1	HOLO hdlist[HDMAX+1]; / global holodeck list */
22
23	gregl	3.10	char cmdlist[DC_NCMDS][8] = DC_INIT;
24
25	gregl	3.1	int imm_mode = 0; /* bundles are being delivered immediately */
26
27			char progname; / global argv[0] */
28
29	gregl	3.10	FILE sstdin, sstdout; /* server's standard input and output */
30	gregl	3.1
31	gregl	3.10	#define RDY_SRV 01
32			#define RDY_DEV 02
33			#define RDY_SIN 04
34	gregl	3.1
35	gregl	3.10
36	gregl	3.1	main(argc, argv)
37			int argc;
38			char *argv[];
39			{
40	gregl	3.10	extern int eputs();
41	gregl	3.3	int rdy, inp, res = 0, pause = 0;
42	gregl	3.1
43			progname = argv[0];
44	gregl	3.10	if (argc < 3)
45	gregl	3.1	error(USER, "bad command line arguments");
46			/* open our device */
47			dev_open(argv[1]);
48	gregl	3.10	/* open server process i/o */
49			sstdout = fdopen(atoi(argv[2]), "w");
50			if (argc < 4 \|\| (inp = atoi(argv[3])) < 0)
51			sstdin = NULL;
52			else
53			sstdin = fdopen(inp, "r");
54			/* set command error vector */
55			erract[COMMAND].pf = eputs;
56	gregl	3.1	/* enter main loop */
57			do {
58			rdy = disp_wait();
59	gregl	3.10	if (rdy & RDY_DEV) { /* user input from driver */
60	gregl	3.3	inp = dev_input();
61	gregl	3.13	if (inp & DFL(DC_SETVIEW))
62			new_view(&odev.v);
63			if (inp & DFL(DC_GETVIEW))
64	gregl	3.10	printview();
65	gregl	3.13	if (inp & DFL(DC_LASTVIEW))
66	gregl	3.12	new_view(NULL);
67	gregl	3.13	if (inp & DFL(DC_RESUME)) {
68	gregl	3.3	serv_request(DR_NOOP, 0, NULL);
69			pause = 0;
70			}
71	gregl	3.15	if (inp & DFL(DC_PAUSE))
72			pause = 1;
73	gregl	3.13	if (inp & DFL(DC_REDRAW))
74			imm_mode = beam_sync() > 0;
75	gregl	3.15	if (inp & DFL(DC_KILL)) {
76	gregl	3.14	serv_request(DR_KILL, 0, NULL);
77	gregl	3.15	pause = 0;
78			}
79	gregl	3.14	if (inp & DFL(DC_CLOBBER))
80			serv_request(DR_CLOBBER, 0, NULL);
81	gregl	3.15	if (inp & DFL(DC_RESTART)) {
82	gregl	3.14	serv_request(DR_RESTART, 0, NULL);
83	gregl	3.15	pause = 0;
84			}
85	gregl	3.13	if (inp & DFL(DC_QUIT))
86			serv_request(DR_SHUTDOWN, 0, NULL);
87	gregl	3.3	}
88	gregl	3.10	if (rdy & RDY_SIN) /* user input from sstdin */
89			switch (usr_input()) {
90			case DC_PAUSE:
91			pause = 1;
92			break;
93			case DC_RESUME:
94			serv_request(DR_NOOP, 0, NULL);
95	gregl	3.15	/* fall through */
96			case DC_KILL:
97			case DC_RESTART:
98	gregl	3.10	pause = 0;
99			break;
100			}
101			if (rdy & RDY_SRV) { /* process server result */
102	gregl	3.3	res = serv_result();
103			if (pause && res != DS_SHUTDOWN) {
104	gregl	3.2	serv_request(DR_ATTEN, 0, NULL);
105	gregl	3.3	while ((res = serv_result()) != DS_ACKNOW &&
106			res != DS_SHUTDOWN)
107			;
108			}
109	gregl	3.2	}
110	gregl	3.1	} while (res != DS_SHUTDOWN);
111			/* all done */
112			quit(0);
113			}
114
115
116			int
117			disp_wait() /* wait for more input */
118			{
119			fd_set readset, errset;
120			int flgs;
121			int n;
122			register int i;
123			/* see if we can avoid select call */
124			if (imm_mode \|\| stdin->_cnt > 0)
125	gregl	3.4	return(RDY_SRV);
126	gregl	3.10	if (sstdin != NULL && sstdin->_cnt > 0)
127			return(RDY_SIN);
128	gregl	3.1	if (dev_flush())
129	gregl	3.4	return(RDY_DEV);
130	gregl	3.1	/* make the call */
131			FD_ZERO(&readset); FD_ZERO(&errset);
132			FD_SET(0, &readset);
133			FD_SET(0, &errset);
134			FD_SET(odev.ifd, &readset);
135			FD_SET(odev.ifd, &errset);
136	gregl	3.10	n = odev.ifd+1;
137			if (sstdin != NULL) {
138			FD_SET(fileno(sstdin), &readset);
139			if (fileno(sstdin) >= n)
140			n = fileno(sstdin) + 1;
141			}
142	gregl	3.1	n = select(n, &readset, NULL, &errset, NULL);
143			if (n < 0) {
144			if (errno == EINTR)
145			return(0);
146			error(SYSTEM, "select call failure in disp_wait");
147			}
148			flgs = 0; /* flag what's ready */
149			if (FD_ISSET(0, &readset) \|\| FD_ISSET(0, &errset))
150	gregl	3.4	flgs \|= RDY_SRV;
151	gregl	3.1	if (FD_ISSET(odev.ifd, &readset) \|\| FD_ISSET(odev.ifd, &errset))
152	gregl	3.4	flgs \|= RDY_DEV;
153	gregl	3.10	if (sstdin != NULL && FD_ISSET(fileno(sstdin), &readset))
154			flgs \|= RDY_SIN;
155	gregl	3.1	return(flgs);
156			}
157
158
159			add_holo(hdg) /* register a new holodeck section */
160			HDGRID *hdg;
161			{
162			VIEW nv;
163			register int hd;
164
165			for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
166			;
167			if (hd >= HDMAX)
168			error(INTERNAL, "too many holodeck sections in add_holo");
169			hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
170			if (hdlist[hd] == NULL)
171			error(SYSTEM, "out of memory in add_holo");
172			bcopy((char )hdg, (char )hdlist[hd], sizeof(HDGRID));
173			hdcompgrid(hdlist[hd]);
174			if (hd)
175			return;
176			/* set initial viewpoint */
177			copystruct(&nv, &odev.v);
178			VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
179			VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
180			VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
181			fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
182			VCOPY(nv.vup, hdlist[0]->xv[2]);
183			new_view(&nv);
184			}
185
186
187			disp_bundle(p) /* display a ray bundle */
188			register PACKHEAD *p;
189			{
190			GCOORD gc[2];
191			FVECT ro, rd, wp;
192			double d;
193			register int i;
194			/* get beam coordinates */
195			if (p->hd < 0 \| p->hd >= HDMAX \|\| hdlist[p->hd] == NULL)
196			error(INTERNAL, "bad holodeck number in disp_bundle");
197			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
198			error(INTERNAL, "bad beam index in disp_bundle");
199			/* display each ray */
200			for (i = p->nr; i--; ) {
201			hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
202			d = hddepth(hdlist[p->hd], packra(p)[i].d);
203			VSUM(wp, ro, rd, d); /* might be behind viewpoint */
204	gregl	3.9	dev_value(packra(p)[i].v, wp, rd);
205	gregl	3.1	}
206			}
207
208
209			new_view(v) /* change view parameters */
210	gregl	3.12	register VIEW *v;
211	gregl	3.1	{
212	gregl	3.12	static VIEW viewhist[VIEWHISTLEN];
213			static unsigned nhist;
214	gregl	3.1	char *err;
215	gregl	3.12	/* restore previous view? */
216			if (v == NULL) {
217	gregl	3.16	if (nhist > 1) /* get one before last setting */
218			nhist--;
219			else /* else go to end of list */
220			while (nhist < VIEWHISTLEN && viewhist[nhist].type)
221			nhist++;
222	gregl	3.12	v = viewhist + ((nhist-1)%VIEWHISTLEN);
223	gregl	3.17	} else
224			again:
225			if ((err = setview(v)) != NULL) {
226	gregl	3.12	error(COMMAND, err);
227			return;
228			}
229			if (v->type == VT_PAR) {
230			error(COMMAND, "cannot handle parallel views");
231			return;
232			}
233			if (!dev_view(v)) /* update display driver */
234			goto again;
235			dev_flush(); /* update screen */
236			if (!beam_view(v)) /* update beam list */
237			goto again;
238			/* record new view */
239			if (v < viewhist \|\| v >= viewhist+VIEWHISTLEN) {
240			copystruct(viewhist + (nhist%VIEWHISTLEN), v);
241			nhist++;
242			}
243	gregl	3.10	}
244
245
246			int
247			usr_input() /* get user input and process it */
248			{
249			VIEW vparams;
250			char cmd[128];
251			register char *args;
252	gregl	3.11	register int i;
253	gregl	3.10
254			if (fgets(cmd, sizeof(cmd), sstdin) == NULL)
255			return(DC_QUIT);
256			for (args = cmd; args && !isspace(args); args++)
257			;
258			while (isspace(*args))
259			*args++ = '\0';
260			if (!*cmd)
261			return(DC_RESUME);
262	gregl	3.11	if (*args && args[i=strlen(args)-1] == '\n')
263			args[i] = '\0';
264			for (i = 0; i < DC_NCMDS; i++)
265			if (!strcmp(cmd, cmdlist[i]))
266	gregl	3.10	break;
267	gregl	3.11	if (i >= DC_NCMDS) {
268	gregl	3.10	sprintf(errmsg, "unknown command: %s", cmd);
269			error(COMMAND, errmsg);
270			return(-1);
271			}
272	gregl	3.11	switch (i) {
273	gregl	3.10	case DC_SETVIEW: /* set the view */
274			copystruct(&vparams, &odev.v);
275			if (!sscanview(&vparams, args))
276			error(COMMAND, "missing view options");
277			else
278			new_view(&vparams);
279			break;
280			case DC_GETVIEW: /* print the current view */
281			printview();
282	gregl	3.12	break;
283			case DC_LASTVIEW: /* restore previous view */
284			new_view(NULL);
285	gregl	3.10	break;
286			case DC_PAUSE: /* pause the current calculation */
287			case DC_RESUME: /* resume the calculation */
288			/* handled in main() */
289	gregl	3.13	break;
290			case DC_REDRAW: /* redraw from server */
291			imm_mode = beam_sync() > 0;
292	gregl	3.14	break;
293			case DC_KILL: /* kill rtrace process(es) */
294			serv_request(DR_KILL, 0, NULL);
295			break;
296			case DC_CLOBBER: /* clobber holodeck */
297			serv_request(DR_CLOBBER, 0, NULL);
298			break;
299			case DC_RESTART: /* restart rtrace */
300			serv_request(DR_RESTART, 0, NULL);
301	gregl	3.10	break;
302			case DC_QUIT: /* quit request */
303			serv_request(DR_SHUTDOWN, 0, NULL);
304			break;
305			default:
306			error(CONSISTENCY, "bad command id in usr_input");
307			}
308	gregl	3.11	return(i);
309	gregl	3.10	}
310
311
312			printview() /* print our current view to server stdout */
313			{
314			fputs(VIEWSTR, sstdout);
315			fprintview(&odev.v, sstdout);
316			fputc('\n', sstdout);
317			fflush(sstdout);
318	gregl	3.1	}
319
320
321			int
322			serv_result() /* get next server result and process it */
323			{
324			static char *buf = NULL;
325			static int bufsiz = 0;
326			MSGHEAD msg;
327			int n;
328			/* read message header */
329			if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
330			goto readerr;
331			if (msg.nbytes > 0) { /* get the message body */
332			if (msg.nbytes > bufsiz) {
333			if (buf == NULL)
334			buf = (char *)malloc(bufsiz=msg.nbytes);
335			else
336			buf = (char *)realloc(buf, bufsiz=msg.nbytes);
337			if (buf == NULL)
338			error(SYSTEM, "out of memory in serv_result");
339			}
340			if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
341			goto readerr;
342			}
343			switch (msg.type) { /* process results */
344			case DS_BUNDLE:
345			if (msg.nbytes < sizeof(PACKHEAD) \|\|
346			msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
347			error(INTERNAL, "bad display packet from server");
348			disp_bundle((PACKHEAD *)buf);
349			break;
350			case DS_ADDHOLO:
351			if (msg.nbytes != sizeof(HDGRID))
352			error(INTERNAL, "bad holodeck record from server");
353			add_holo((HDGRID *)buf);
354			break;
355			case DS_STARTIMM:
356			case DS_ENDIMM:
357			imm_mode = msg.type==DS_STARTIMM;
358			/* fall through */
359			case DS_ACKNOW:
360			case DS_SHUTDOWN:
361			if (msg.nbytes) {
362			sprintf(errmsg,
363			"unexpected body with server message %d",
364			msg.type);
365			error(INTERNAL, errmsg);
366			}
367			break;
368			default:
369			error(INTERNAL, "unrecognized result from server process");
370			}
371			return(msg.type); /* return message type */
372			readerr:
373			if (feof(stdin))
374			error(SYSTEM, "server process died");
375			error(SYSTEM, "error reading from server process");
376			}
377
378
379			serv_request(type, nbytes, p) /* send a request to the server process */
380			int type, nbytes;
381			char *p;
382			{
383			MSGHEAD msg;
384			int m;
385			/* get server's attention for big request */
386			if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
387			serv_request(DR_ATTEN, 0, NULL);
388			while ((m = serv_result()) != DS_ACKNOW)
389			if (m == DS_SHUTDOWN) /* the bugger quit on us */
390			quit(0);
391			}
392			msg.type = type; /* write and flush the message */
393			msg.nbytes = nbytes;
394			fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
395			if (nbytes > 0)
396			fwrite(p, 1, nbytes, stdout);
397			if (fflush(stdout) < 0)
398			error(SYSTEM, "write error in serv_request");
399	gregl	3.2	}
400
401
402			eputs(s) /* put error message to stderr */
403			register char *s;
404			{
405			static int midline = 0;
406
407			if (!*s)
408			return;
409			if (!midline++) { /* prepend line with program name */
410			fputs(progname, stderr);
411			fputs(": ", stderr);
412			}
413			fputs(s, stderr);
414			if (s[strlen(s)-1] == '\n') {
415			fflush(stderr);
416			midline = 0;
417			}
418	gregl	3.1	}
419
420
421			quit(code) /* clean up and exit */
422			int code;
423			{
424			if (odev.v.type)
425			dev_close();
426			exit(code);
427			}