src/hd/rhdisp.c

/* Copyright (c) 1998 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 */

int     do_outside = 0;         /* render from outside sections */

double  eyesepdist = 1;         /* eye separation distance */

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

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

#ifdef DEBUG
#include <sys/types.h>
extern time_t   time();
static time_t   tmodesw;
static time_t   timm, tadd;
static long     nimmrays, naddrays;
#endif

#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;
#ifdef DEBUG
        tmodesw = time(NULL);
#endif
                                        /* enter main loop */
        do {
                rdy = disp_wait();
                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)
                                        ;
                        }
                }
                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(1) > 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;
                        }
        } while (res != DS_SHUTDOWN);
#ifdef DEBUG
        if (timm && nimmrays)
                fprintf(stderr,
                        "%s: %.1f rays recalled/second (%ld rays total)\n",
                                progname, (double)nimmrays/timm, nimmrays);
        if (tadd && naddrays)
                fprintf(stderr,
                        "%s: %.1f rays calculated/second (%ld rays total)\n",
                                progname, (double)naddrays/tadd, naddrays);
#endif
                                        /* 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);
                FD_SET(fileno(sstdin), &errset);
                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) ||
                                FD_ISSET(fileno(sstdin), &errset)))
                flgs |= RDY_SIN;
        return(flgs);
}


add_holo(hdg)                   /* register a new holodeck section */
HDGRID  *hdg;
{
        VIEW    nv;
        double  d;
        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]);
        if (do_outside) {
                normalize(nv.vdir);
                d = VLEN(hdlist[0]->xv[1]);
                d += VLEN(hdlist[0]->xv[2]);
                VSUM(nv.vp, nv.vp, nv.vdir, -d);
        }
        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);
        }
#ifdef DEBUG
        if (imm_mode) nimmrays += p->nr;
        else naddrays += p->nr;
#endif
}


new_view(v)                     /* change view parameters */
register VIEW   *v;
{
        static VIEW     viewhist[VIEWHISTLEN];
        static unsigned nhist;
        VIEW    *dv;
        int     i, res[2];
        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))       /* notify display driver */
                goto again;
        dev_flush();            /* update screen */
        beam_init();            /* compute new beam set */
        for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++)
                if (!beam_view(dv, res[0], res[1])) {
                        if (!nhist) {
                                error(COMMAND, "invalid starting view");
                                return;
                        }
                        copystruct(v, viewhist + ((nhist-1)%VIEWHISTLEN));
                        goto again;
                }
        beam_sync(0);           /* update server */
                                /* 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[256];
        register char   *args;
        register int    i;

        if (fgets(cmd, sizeof(cmd), sstdin) == NULL) {
                fclose(sstdin);
                sstdin = NULL;
                return(0);
        }
        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(1) > 0;
                dev_clear();
                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_OUTSECT:
                do_outside = 1;
                break;
        case DS_EYESEP:
                if (msg.nbytes <= 1 || (eyesepdist = atof(buf)) <= FTINY)
                        error(INTERNAL, "bad eye separation from server");
                break;
        case DS_STARTIMM:
        case DS_ENDIMM:
#ifdef DEBUG
                if (imm_mode != (msg.type==DS_STARTIMM)) {
                        time_t  tnow = time(NULL);
                        if (imm_mode) timm += tnow - tmodesw;
                        else tadd += tnow - tmodesw;
                        tmodesw = tnow;
                }
#endif
                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:	3.25
Committed:	Fri May 22 08:30:40 1998 UTC (27 years, 5 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 3.24:	+6 -0 lines
Log Message:	added EYESEP variable for world eye separation distance
#	User	Rev	Content
1	gregl	3.23	/* Copyright (c) 1998 Silicon Graphics, Inc. */
2	gregl	3.1
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	gregl	3.20	int do_outside = 0; /* render from outside sections */
28
29	gwlarson	3.25	double eyesepdist = 1; /* eye separation distance */
30
31	gregl	3.1	char progname; / global argv[0] */
32
33	gregl	3.10	FILE sstdin, sstdout; /* server's standard input and output */
34	gregl	3.1
35	gregl	3.21	#ifdef DEBUG
36			#include <sys/types.h>
37			extern time_t time();
38			static time_t tmodesw;
39			static time_t timm, tadd;
40			static long nimmrays, naddrays;
41			#endif
42
43	gregl	3.10	#define RDY_SRV 01
44			#define RDY_DEV 02
45			#define RDY_SIN 04
46	gregl	3.1
47	gregl	3.10
48	gregl	3.1	main(argc, argv)
49			int argc;
50			char *argv[];
51			{
52	gregl	3.10	extern int eputs();
53	gregl	3.3	int rdy, inp, res = 0, pause = 0;
54	gregl	3.1
55			progname = argv[0];
56	gregl	3.10	if (argc < 3)
57	gregl	3.1	error(USER, "bad command line arguments");
58			/* open our device */
59			dev_open(argv[1]);
60	gregl	3.10	/* open server process i/o */
61			sstdout = fdopen(atoi(argv[2]), "w");
62			if (argc < 4 \|\| (inp = atoi(argv[3])) < 0)
63			sstdin = NULL;
64			else
65			sstdin = fdopen(inp, "r");
66			/* set command error vector */
67			erract[COMMAND].pf = eputs;
68	gregl	3.21	#ifdef DEBUG
69			tmodesw = time(NULL);
70			#endif
71	gregl	3.1	/* enter main loop */
72			do {
73			rdy = disp_wait();
74	gregl	3.19	if (rdy & RDY_SRV) { /* process server result */
75			res = serv_result();
76			if (pause && res != DS_SHUTDOWN) {
77			serv_request(DR_ATTEN, 0, NULL);
78			while ((res = serv_result()) != DS_ACKNOW &&
79			res != DS_SHUTDOWN)
80			;
81			}
82			}
83	gregl	3.10	if (rdy & RDY_DEV) { /* user input from driver */
84	gregl	3.3	inp = dev_input();
85	gregl	3.13	if (inp & DFL(DC_SETVIEW))
86			new_view(&odev.v);
87			if (inp & DFL(DC_GETVIEW))
88	gregl	3.10	printview();
89	gregl	3.13	if (inp & DFL(DC_LASTVIEW))
90	gregl	3.12	new_view(NULL);
91	gregl	3.13	if (inp & DFL(DC_RESUME)) {
92	gregl	3.3	serv_request(DR_NOOP, 0, NULL);
93			pause = 0;
94			}
95	gregl	3.15	if (inp & DFL(DC_PAUSE))
96			pause = 1;
97	gregl	3.13	if (inp & DFL(DC_REDRAW))
98	gwlarson	3.24	imm_mode = beam_sync(1) > 0;
99	gregl	3.15	if (inp & DFL(DC_KILL)) {
100	gregl	3.14	serv_request(DR_KILL, 0, NULL);
101	gregl	3.15	pause = 0;
102			}
103	gregl	3.14	if (inp & DFL(DC_CLOBBER))
104			serv_request(DR_CLOBBER, 0, NULL);
105	gregl	3.15	if (inp & DFL(DC_RESTART)) {
106	gregl	3.14	serv_request(DR_RESTART, 0, NULL);
107	gregl	3.15	pause = 0;
108			}
109	gregl	3.13	if (inp & DFL(DC_QUIT))
110			serv_request(DR_SHUTDOWN, 0, NULL);
111	gregl	3.3	}
112	gregl	3.10	if (rdy & RDY_SIN) /* user input from sstdin */
113			switch (usr_input()) {
114			case DC_PAUSE:
115			pause = 1;
116			break;
117			case DC_RESUME:
118			serv_request(DR_NOOP, 0, NULL);
119	gregl	3.15	/* fall through */
120			case DC_KILL:
121			case DC_RESTART:
122	gregl	3.10	pause = 0;
123			break;
124			}
125	gregl	3.1	} while (res != DS_SHUTDOWN);
126	gregl	3.21	#ifdef DEBUG
127			if (timm && nimmrays)
128			fprintf(stderr,
129			"%s: %.1f rays recalled/second (%ld rays total)\n",
130			progname, (double)nimmrays/timm, nimmrays);
131			if (tadd && naddrays)
132			fprintf(stderr,
133			"%s: %.1f rays calculated/second (%ld rays total)\n",
134			progname, (double)naddrays/tadd, naddrays);
135			#endif
136	gregl	3.1	/* all done */
137			quit(0);
138			}
139
140
141			int
142			disp_wait() /* wait for more input */
143			{
144			fd_set readset, errset;
145			int flgs;
146			int n;
147			register int i;
148			/* see if we can avoid select call */
149			if (imm_mode \|\| stdin->_cnt > 0)
150	gregl	3.4	return(RDY_SRV);
151	gregl	3.10	if (sstdin != NULL && sstdin->_cnt > 0)
152			return(RDY_SIN);
153	gregl	3.1	if (dev_flush())
154	gregl	3.4	return(RDY_DEV);
155	gregl	3.1	/* make the call */
156			FD_ZERO(&readset); FD_ZERO(&errset);
157			FD_SET(0, &readset);
158			FD_SET(0, &errset);
159			FD_SET(odev.ifd, &readset);
160			FD_SET(odev.ifd, &errset);
161	gregl	3.10	n = odev.ifd+1;
162			if (sstdin != NULL) {
163			FD_SET(fileno(sstdin), &readset);
164	gregl	3.23	FD_SET(fileno(sstdin), &errset);
165	gregl	3.10	if (fileno(sstdin) >= n)
166			n = fileno(sstdin) + 1;
167			}
168	gregl	3.1	n = select(n, &readset, NULL, &errset, NULL);
169			if (n < 0) {
170			if (errno == EINTR)
171			return(0);
172			error(SYSTEM, "select call failure in disp_wait");
173			}
174			flgs = 0; /* flag what's ready */
175			if (FD_ISSET(0, &readset) \|\| FD_ISSET(0, &errset))
176	gregl	3.4	flgs \|= RDY_SRV;
177	gregl	3.1	if (FD_ISSET(odev.ifd, &readset) \|\| FD_ISSET(odev.ifd, &errset))
178	gregl	3.4	flgs \|= RDY_DEV;
179	gregl	3.23	if (sstdin != NULL && (FD_ISSET(fileno(sstdin), &readset) \|\|
180			FD_ISSET(fileno(sstdin), &errset)))
181	gregl	3.10	flgs \|= RDY_SIN;
182	gregl	3.1	return(flgs);
183			}
184
185
186			add_holo(hdg) /* register a new holodeck section */
187			HDGRID *hdg;
188			{
189			VIEW nv;
190	gregl	3.20	double d;
191	gregl	3.1	register int hd;
192
193			for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
194			;
195			if (hd >= HDMAX)
196			error(INTERNAL, "too many holodeck sections in add_holo");
197			hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
198			if (hdlist[hd] == NULL)
199			error(SYSTEM, "out of memory in add_holo");
200			bcopy((char )hdg, (char )hdlist[hd], sizeof(HDGRID));
201			hdcompgrid(hdlist[hd]);
202			if (hd)
203			return;
204			/* set initial viewpoint */
205			copystruct(&nv, &odev.v);
206			VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
207			VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
208			VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
209			fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
210			VCOPY(nv.vup, hdlist[0]->xv[2]);
211	gregl	3.20	if (do_outside) {
212			normalize(nv.vdir);
213			d = VLEN(hdlist[0]->xv[1]);
214			d += VLEN(hdlist[0]->xv[2]);
215			VSUM(nv.vp, nv.vp, nv.vdir, -d);
216			}
217	gregl	3.1	new_view(&nv);
218			}
219
220
221			disp_bundle(p) /* display a ray bundle */
222			register PACKHEAD *p;
223			{
224			GCOORD gc[2];
225			FVECT ro, rd, wp;
226			double d;
227			register int i;
228			/* get beam coordinates */
229			if (p->hd < 0 \| p->hd >= HDMAX \|\| hdlist[p->hd] == NULL)
230			error(INTERNAL, "bad holodeck number in disp_bundle");
231			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
232			error(INTERNAL, "bad beam index in disp_bundle");
233			/* display each ray */
234			for (i = p->nr; i--; ) {
235			hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
236			d = hddepth(hdlist[p->hd], packra(p)[i].d);
237			VSUM(wp, ro, rd, d); /* might be behind viewpoint */
238	gregl	3.9	dev_value(packra(p)[i].v, wp, rd);
239	gregl	3.1	}
240	gregl	3.21	#ifdef DEBUG
241			if (imm_mode) nimmrays += p->nr;
242			else naddrays += p->nr;
243			#endif
244	gregl	3.1	}
245
246
247			new_view(v) /* change view parameters */
248	gregl	3.12	register VIEW *v;
249	gregl	3.1	{
250	gregl	3.12	static VIEW viewhist[VIEWHISTLEN];
251			static unsigned nhist;
252	gwlarson	3.24	VIEW *dv;
253			int i, res[2];
254	gregl	3.1	char *err;
255	gregl	3.12	/* restore previous view? */
256			if (v == NULL) {
257	gregl	3.16	if (nhist > 1) /* get one before last setting */
258			nhist--;
259			else /* else go to end of list */
260			while (nhist < VIEWHISTLEN && viewhist[nhist].type)
261			nhist++;
262	gregl	3.12	v = viewhist + ((nhist-1)%VIEWHISTLEN);
263	gregl	3.17	} else
264			again:
265			if ((err = setview(v)) != NULL) {
266	gregl	3.12	error(COMMAND, err);
267			return;
268			}
269			if (v->type == VT_PAR) {
270			error(COMMAND, "cannot handle parallel views");
271			return;
272			}
273	gwlarson	3.24	if (!dev_view(v)) /* notify display driver */
274	gregl	3.12	goto again;
275			dev_flush(); /* update screen */
276	gwlarson	3.24	beam_init(); /* compute new beam set */
277			for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++)
278			if (!beam_view(dv, res[0], res[1])) {
279			if (!nhist) {
280			error(COMMAND, "invalid starting view");
281			return;
282			}
283			copystruct(v, viewhist + ((nhist-1)%VIEWHISTLEN));
284			goto again;
285			}
286			beam_sync(0); /* update server */
287	gregl	3.12	/* record new view */
288			if (v < viewhist \|\| v >= viewhist+VIEWHISTLEN) {
289			copystruct(viewhist + (nhist%VIEWHISTLEN), v);
290			nhist++;
291			}
292	gregl	3.10	}
293
294
295			int
296			usr_input() /* get user input and process it */
297			{
298			VIEW vparams;
299	gregl	3.23	char cmd[256];
300	gregl	3.10	register char *args;
301	gregl	3.11	register int i;
302	gregl	3.10
303	gregl	3.23	if (fgets(cmd, sizeof(cmd), sstdin) == NULL) {
304			fclose(sstdin);
305			sstdin = NULL;
306			return(0);
307			}
308	gregl	3.10	for (args = cmd; args && !isspace(args); args++)
309			;
310			while (isspace(*args))
311			*args++ = '\0';
312			if (!*cmd)
313			return(DC_RESUME);
314	gregl	3.11	if (*args && args[i=strlen(args)-1] == '\n')
315			args[i] = '\0';
316			for (i = 0; i < DC_NCMDS; i++)
317			if (!strcmp(cmd, cmdlist[i]))
318	gregl	3.10	break;
319	gregl	3.11	if (i >= DC_NCMDS) {
320	gregl	3.10	sprintf(errmsg, "unknown command: %s", cmd);
321			error(COMMAND, errmsg);
322			return(-1);
323			}
324	gregl	3.11	switch (i) {
325	gregl	3.10	case DC_SETVIEW: /* set the view */
326			copystruct(&vparams, &odev.v);
327			if (!sscanview(&vparams, args))
328			error(COMMAND, "missing view options");
329			else
330			new_view(&vparams);
331			break;
332			case DC_GETVIEW: /* print the current view */
333			printview();
334	gregl	3.12	break;
335			case DC_LASTVIEW: /* restore previous view */
336			new_view(NULL);
337	gregl	3.10	break;
338			case DC_PAUSE: /* pause the current calculation */
339			case DC_RESUME: /* resume the calculation */
340			/* handled in main() */
341	gregl	3.13	break;
342			case DC_REDRAW: /* redraw from server */
343	gwlarson	3.24	imm_mode = beam_sync(1) > 0;
344	gregl	3.22	dev_clear();
345	gregl	3.14	break;
346			case DC_KILL: /* kill rtrace process(es) */
347			serv_request(DR_KILL, 0, NULL);
348			break;
349			case DC_CLOBBER: /* clobber holodeck */
350			serv_request(DR_CLOBBER, 0, NULL);
351			break;
352			case DC_RESTART: /* restart rtrace */
353			serv_request(DR_RESTART, 0, NULL);
354	gregl	3.10	break;
355			case DC_QUIT: /* quit request */
356			serv_request(DR_SHUTDOWN, 0, NULL);
357			break;
358			default:
359			error(CONSISTENCY, "bad command id in usr_input");
360			}
361	gregl	3.11	return(i);
362	gregl	3.10	}
363
364
365			printview() /* print our current view to server stdout */
366			{
367			fputs(VIEWSTR, sstdout);
368			fprintview(&odev.v, sstdout);
369			fputc('\n', sstdout);
370			fflush(sstdout);
371	gregl	3.1	}
372
373
374			int
375			serv_result() /* get next server result and process it */
376			{
377			static char *buf = NULL;
378			static int bufsiz = 0;
379			MSGHEAD msg;
380			int n;
381			/* read message header */
382			if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
383			goto readerr;
384			if (msg.nbytes > 0) { /* get the message body */
385			if (msg.nbytes > bufsiz) {
386			if (buf == NULL)
387			buf = (char *)malloc(bufsiz=msg.nbytes);
388			else
389			buf = (char *)realloc(buf, bufsiz=msg.nbytes);
390			if (buf == NULL)
391			error(SYSTEM, "out of memory in serv_result");
392			}
393			if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
394			goto readerr;
395			}
396			switch (msg.type) { /* process results */
397			case DS_BUNDLE:
398			if (msg.nbytes < sizeof(PACKHEAD) \|\|
399			msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
400			error(INTERNAL, "bad display packet from server");
401			disp_bundle((PACKHEAD *)buf);
402			break;
403			case DS_ADDHOLO:
404			if (msg.nbytes != sizeof(HDGRID))
405			error(INTERNAL, "bad holodeck record from server");
406			add_holo((HDGRID *)buf);
407	gregl	3.20	break;
408			case DS_OUTSECT:
409			do_outside = 1;
410	gwlarson	3.25	break;
411			case DS_EYESEP:
412			if (msg.nbytes <= 1 \|\| (eyesepdist = atof(buf)) <= FTINY)
413			error(INTERNAL, "bad eye separation from server");
414	gregl	3.1	break;
415			case DS_STARTIMM:
416			case DS_ENDIMM:
417	gregl	3.21	#ifdef DEBUG
418			if (imm_mode != (msg.type==DS_STARTIMM)) {
419			time_t tnow = time(NULL);
420			if (imm_mode) timm += tnow - tmodesw;
421			else tadd += tnow - tmodesw;
422			tmodesw = tnow;
423			}
424			#endif
425	gregl	3.1	imm_mode = msg.type==DS_STARTIMM;
426			/* fall through */
427			case DS_ACKNOW:
428			case DS_SHUTDOWN:
429			if (msg.nbytes) {
430			sprintf(errmsg,
431			"unexpected body with server message %d",
432			msg.type);
433			error(INTERNAL, errmsg);
434			}
435			break;
436			default:
437			error(INTERNAL, "unrecognized result from server process");
438			}
439			return(msg.type); /* return message type */
440			readerr:
441			if (feof(stdin))
442			error(SYSTEM, "server process died");
443			error(SYSTEM, "error reading from server process");
444			}
445
446
447			serv_request(type, nbytes, p) /* send a request to the server process */
448			int type, nbytes;
449			char *p;
450			{
451			MSGHEAD msg;
452			int m;
453			/* get server's attention for big request */
454			if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
455			serv_request(DR_ATTEN, 0, NULL);
456			while ((m = serv_result()) != DS_ACKNOW)
457			if (m == DS_SHUTDOWN) /* the bugger quit on us */
458			quit(0);
459			}
460			msg.type = type; /* write and flush the message */
461			msg.nbytes = nbytes;
462			fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
463			if (nbytes > 0)
464			fwrite(p, 1, nbytes, stdout);
465			if (fflush(stdout) < 0)
466			error(SYSTEM, "write error in serv_request");
467	gregl	3.2	}
468
469
470			eputs(s) /* put error message to stderr */
471			register char *s;
472			{
473			static int midline = 0;
474
475			if (!*s)
476			return;
477			if (!midline++) { /* prepend line with program name */
478			fputs(progname, stderr);
479			fputs(": ", stderr);
480			}
481			fputs(s, stderr);
482			if (s[strlen(s)-1] == '\n') {
483			fflush(stderr);
484			midline = 0;
485			}
486	gregl	3.1	}
487
488
489			quit(code) /* clean up and exit */
490			int code;
491			{
492			if (odev.v.type)
493			dev_close();
494			exit(code);
495			}