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

#ifndef FSIZDEF
#define FSIZDEF         0.125   /* default focus frame size */
#endif

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

char    *hdgfn[HDMAX];          /* holodeck section geometry list */
char    *hdpfn[HDMAX];          /* section portal 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);
                        else if (inp & DFL(DC_LASTVIEW))
                                new_view(NULL);
                        if (inp & DFL(DC_REDRAW))
                                imm_mode = beam_sync(1) > 0;
                        if (inp & DFL(DC_GETVIEW))
                                printview();
                        if (inp & DFL(DC_FOCUS))
                                set_focus(odev_args);
                        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_RESUME)) {
                                serv_request(DR_NOOP, 0, NULL);
                                pause = 0;
                        }
                        if (inp & DFL(DC_PAUSE))
                                pause = 1;
                        if (inp & DFL(DC_QUIT))
                                serv_request(DR_SHUTDOWN, 0, NULL);
                }
                if (rdy & RDY_SIN && !imm_mode) /* 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 (hdlist[0] == NULL)
                return(RDY_SRV);        /* initialize first */
        flgs = 0;               /* flag what's ready already */
        if (imm_mode || stdin->_cnt > 0)
                flgs |= RDY_SRV;
        if (sstdin != NULL && sstdin->_cnt > 0)
                flgs |= RDY_SIN;
        if (odev.inpready)
                flgs |= RDY_DEV;
        if (flgs)               /* got something? */
                return(flgs);
        if (dev_flush())        /* else flush output & check keyboard+mouse */
                return(RDY_DEV);
                                /* if nothing, we need to call select */
        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");
        }
        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, gfn, pfn)         /* register a new holodeck section */
HDGRID  *hdg;
char    *gfn, *pfn;
{
        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]);
        hdgfn[hd] = savestr(gfn);
        hdpfn[hd] = pfn && *pfn ? savestr(pfn) : (char *)NULL;
        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);
                if (d < .99*FHUGE) {
                        VSUM(wp, ro, rd, d);    /* might be behind viewpoint */
                        dev_value(packra(p)[i].v, rd, wp);
                } else
                        dev_value(packra(p)[i].v, rd, NULL);
        }
#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];
        int2    *slist;
        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 (!dev_view(v))       /* notify display driver */
                goto again;
        if (v->type == VT_PAR) {
                error(COMMAND, "cannot handle parallel views");
                return;
        }
        beam_init(odev.firstuse);       /* compute new beam set */
        for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++) {
                if ((slist = beam_view(dv, res[0], res[1])) == NULL) {
                        if (!nhist) {
                                error(COMMAND, "invalid starting view");
                                return;
                        }
                        copystruct(v, viewhist + ((nhist-1)%VIEWHISTLEN));
                        goto again;     /* poss. overloading dev_section()? */
                }
                DCHECK(*slist < 0, WARNING, "no visible sections in new_view");
                for ( ; *slist >= 0; slist++)
                        dev_section(hdgfn[*slist], hdpfn[*slist]);
        }
        dev_section(NULL,NULL); /* end section list */
        dev_flush();            /* update display */
                                /* update server */
        imm_mode = beam_sync(odev.firstuse) > 0;
                                /* record new view */
        if (v < viewhist || v >= viewhist+VIEWHISTLEN) {
                copystruct(viewhist + (nhist%VIEWHISTLEN), v);
                nhist++;
        }
}


set_focus(args)                 /* set focus frame */
char    *args;
{
        double  hcent, vcent, hsiz, vsiz;
        VIEW    *dv, vwfocus;
        int     i, res[2];

        i = sscanf(args, "%lf %lf %lf %lf", &hcent, &vcent, &hsiz, &vsiz);
        if (i < 2 || hcent < 0 || hcent > 1 || vcent < 0 || vcent > 1) {
                beam_init(0);                           /* restore view */
                for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++)
                        beam_view(dv, res[0], res[1]);
                beam_sync(0);                           /* update server */
                return;
        }
        if (i < 4 || hsiz <= hcent || hsiz > 1 || vsiz <= vcent || vsiz > 1)
                hsiz = vsiz = FSIZDEF;                  /* gave center only */
        else {
                hsiz -= hcent; hcent += 0.5*hsiz;       /* gave min and max */
                vsiz -= vcent; vcent += 0.5*vsiz;
        }
        beam_init(0);                                   /* add basic views */
        for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++)
                beam_view(dv, res[0]>>4, res[1]>>4);
        copystruct(&vwfocus, &odev.v);                  /* add focus view */
        switch (odev.v.type) {
        case VT_PER:
                vwfocus.horiz = 2.*180./PI*atan(
                                hsiz * tan(PI/180./2.*odev.v.horiz) );
                vwfocus.vert = 2.*180./PI*atan(
                                vsiz * tan(PI/180./2.*odev.v.vert) );
                break;
        case VT_PAR:
        case VT_ANG:
                vwfocus.horiz = hsiz * odev.v.horiz;
                vwfocus.vert = vsiz * odev.v.vert;
                break;
        case VT_HEM:
                vwfocus.horiz = 2.*180./PI*asin(
                                hsiz * sin(PI/180./2.*odev.v.horiz) );
                vwfocus.vert = 2.*180./PI*asin(
                                vsiz * sin(PI/180./2.*odev.v.vert) );
                break;
        case VT_CYL:
                vwfocus.horiz = hsiz * odev.v.horiz;
                vwfocus.vert = 2.*180./PI*atan(
                                vsiz * tan(PI/180./2.*odev.v.vert) );
                break;
        default:
                error(INTERNAL, "bad view type in set_focus");
        }
        vwfocus.hoff = (odev.v.hoff + hcent - 0.5)/hsiz;
        vwfocus.voff = (odev.v.voff + vcent - 0.5)/vsiz;
        setview(&vwfocus);
        beam_view(&vwfocus, (int)(3*odev.hres*hsiz)+100,
                        (int)(3*odev.vres*vsiz)+100);
        beam_sync(0);                                   /* update server */
}


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(-1);
        }
        if (*cmd == '\n')
                return(DC_RESUME);
        for (args = cmd; *args && !isspace(*args); args++)
                ;
        while (isspace(*args))
                *args++ = '\0';
        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) {
                dev_auxcom(cmd, args);
                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_FOCUS:                  /* set focus frame */
                set_focus(args);
                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)+2)
                        error(INTERNAL, "bad holodeck record from server");
                add_holo((HDGRID *)buf, buf+sizeof(HDGRID),
                        buf+sizeof(HDGRID)+strlen(buf+sizeof(HDGRID))+1);
                break;
        case DS_OUTSECT:
                do_outside = 1;
                goto noargs;
        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:
                if (!(imm_mode = msg.type==DS_STARTIMM))
                        dev_flush();
#ifdef DEBUG
                {
                        time_t  tnow = time(NULL);
                        if (msg.type==DS_STARTIMM) tadd += tnow - tmodesw;
                        else timm += tnow - tmodesw;
                        tmodesw = tnow;
                }
#endif
                goto noargs;
        case DS_ACKNOW:
        case DS_SHUTDOWN:
                goto noargs;
        default:
                error(INTERNAL, "unrecognized result from server process");
        }
        return(msg.type);               /* return message type */
noargs:
        if (msg.nbytes) {
                sprintf(errmsg, "unexpected body with server message %d",
                                msg.type);
                error(INTERNAL, errmsg);
        }
        return(msg.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;
                                /* consistency checks */
        DCHECK(nbytes < 0 || nbytes > 0 & p == NULL,
                        CONSISTENCY, "bad buffer handed to serv_request");
                                /* 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 (code)
                exit(code);
        if (odev.v.type)
                dev_close();
        exit(0);
}
Revision:	3.40
Committed:	Thu Mar 4 10:14:52 1999 UTC (25 years, 1 month ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 3.39:	+4 -1 lines
Log Message:	added wait for initialization in disp_wait() changed return value of beam_view()
#	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	gwlarson	3.36	#ifndef FSIZDEF
22			#define FSIZDEF 0.125 /* default focus frame size */
23			#endif
24
25	gregl	3.1	HOLO hdlist[HDMAX+1]; / global holodeck list */
26
27	gwlarson	3.38	char hdgfn[HDMAX]; / holodeck section geometry list */
28			char hdpfn[HDMAX]; / section portal list */
29	gwlarson	3.37
30	gregl	3.10	char cmdlist[DC_NCMDS][8] = DC_INIT;
31
32	gregl	3.1	int imm_mode = 0; /* bundles are being delivered immediately */
33
34	gregl	3.20	int do_outside = 0; /* render from outside sections */
35
36	gwlarson	3.25	double eyesepdist = 1; /* eye separation distance */
37
38	gregl	3.1	char progname; / global argv[0] */
39
40	gregl	3.10	FILE sstdin, sstdout; /* server's standard input and output */
41	gregl	3.1
42	gregl	3.21	#ifdef DEBUG
43			#include <sys/types.h>
44			extern time_t time();
45			static time_t tmodesw;
46			static time_t timm, tadd;
47			static long nimmrays, naddrays;
48			#endif
49
50	gregl	3.10	#define RDY_SRV 01
51			#define RDY_DEV 02
52			#define RDY_SIN 04
53	gregl	3.1
54	gregl	3.10
55	gregl	3.1	main(argc, argv)
56			int argc;
57			char *argv[];
58			{
59	gregl	3.10	extern int eputs();
60	gregl	3.3	int rdy, inp, res = 0, pause = 0;
61	gregl	3.1
62			progname = argv[0];
63	gregl	3.10	if (argc < 3)
64	gregl	3.1	error(USER, "bad command line arguments");
65			/* open our device */
66			dev_open(argv[1]);
67	gregl	3.10	/* open server process i/o */
68			sstdout = fdopen(atoi(argv[2]), "w");
69			if (argc < 4 \|\| (inp = atoi(argv[3])) < 0)
70			sstdin = NULL;
71			else
72			sstdin = fdopen(inp, "r");
73			/* set command error vector */
74			erract[COMMAND].pf = eputs;
75	gregl	3.21	#ifdef DEBUG
76			tmodesw = time(NULL);
77			#endif
78	gregl	3.1	/* enter main loop */
79			do {
80			rdy = disp_wait();
81	gregl	3.19	if (rdy & RDY_SRV) { /* process server result */
82			res = serv_result();
83			if (pause && res != DS_SHUTDOWN) {
84			serv_request(DR_ATTEN, 0, NULL);
85			while ((res = serv_result()) != DS_ACKNOW &&
86			res != DS_SHUTDOWN)
87			;
88			}
89			}
90	gregl	3.10	if (rdy & RDY_DEV) { /* user input from driver */
91	gregl	3.3	inp = dev_input();
92	gregl	3.13	if (inp & DFL(DC_SETVIEW))
93			new_view(&odev.v);
94	gwlarson	3.37	else if (inp & DFL(DC_LASTVIEW))
95			new_view(NULL);
96			if (inp & DFL(DC_REDRAW))
97			imm_mode = beam_sync(1) > 0;
98	gregl	3.13	if (inp & DFL(DC_GETVIEW))
99	gregl	3.10	printview();
100	gwlarson	3.36	if (inp & DFL(DC_FOCUS))
101			set_focus(odev_args);
102	gregl	3.15	if (inp & DFL(DC_KILL)) {
103	gregl	3.14	serv_request(DR_KILL, 0, NULL);
104	gregl	3.15	pause = 0;
105			}
106	gregl	3.14	if (inp & DFL(DC_CLOBBER))
107			serv_request(DR_CLOBBER, 0, NULL);
108	gregl	3.15	if (inp & DFL(DC_RESTART)) {
109	gregl	3.14	serv_request(DR_RESTART, 0, NULL);
110	gregl	3.15	pause = 0;
111			}
112	gwlarson	3.32	if (inp & DFL(DC_RESUME)) {
113			serv_request(DR_NOOP, 0, NULL);
114			pause = 0;
115			}
116			if (inp & DFL(DC_PAUSE))
117			pause = 1;
118	gregl	3.13	if (inp & DFL(DC_QUIT))
119			serv_request(DR_SHUTDOWN, 0, NULL);
120	gregl	3.3	}
121	gwlarson	3.34	if (rdy & RDY_SIN && !imm_mode) /* user input from sstdin */
122	gregl	3.10	switch (usr_input()) {
123			case DC_PAUSE:
124			pause = 1;
125			break;
126			case DC_RESUME:
127			serv_request(DR_NOOP, 0, NULL);
128	gregl	3.15	/* fall through */
129			case DC_KILL:
130			case DC_RESTART:
131	gregl	3.10	pause = 0;
132			break;
133			}
134	gregl	3.1	} while (res != DS_SHUTDOWN);
135	gregl	3.21	#ifdef DEBUG
136			if (timm && nimmrays)
137			fprintf(stderr,
138			"%s: %.1f rays recalled/second (%ld rays total)\n",
139			progname, (double)nimmrays/timm, nimmrays);
140			if (tadd && naddrays)
141			fprintf(stderr,
142			"%s: %.1f rays calculated/second (%ld rays total)\n",
143			progname, (double)naddrays/tadd, naddrays);
144			#endif
145	gregl	3.1	/* all done */
146			quit(0);
147			}
148
149
150			int
151			disp_wait() /* wait for more input */
152			{
153			fd_set readset, errset;
154			int flgs;
155			int n;
156			register int i;
157			/* see if we can avoid select call */
158	gwlarson	3.40	if (hdlist[0] == NULL)
159			return(RDY_SRV); /* initialize first */
160	gwlarson	3.30	flgs = 0; /* flag what's ready already */
161	gregl	3.1	if (imm_mode \|\| stdin->_cnt > 0)
162	gwlarson	3.30	flgs \|= RDY_SRV;
163	gregl	3.10	if (sstdin != NULL && sstdin->_cnt > 0)
164	gwlarson	3.30	flgs \|= RDY_SIN;
165			if (odev.inpready)
166			flgs \|= RDY_DEV;
167			if (flgs) /* got something? */
168			return(flgs);
169			if (dev_flush()) /* else flush output & check keyboard+mouse */
170	gregl	3.4	return(RDY_DEV);
171	gwlarson	3.30	/* if nothing, we need to call select */
172	gregl	3.1	FD_ZERO(&readset); FD_ZERO(&errset);
173			FD_SET(0, &readset);
174			FD_SET(0, &errset);
175			FD_SET(odev.ifd, &readset);
176			FD_SET(odev.ifd, &errset);
177	gregl	3.10	n = odev.ifd+1;
178			if (sstdin != NULL) {
179			FD_SET(fileno(sstdin), &readset);
180	gregl	3.23	FD_SET(fileno(sstdin), &errset);
181	gregl	3.10	if (fileno(sstdin) >= n)
182			n = fileno(sstdin) + 1;
183			}
184	gregl	3.1	n = select(n, &readset, NULL, &errset, NULL);
185			if (n < 0) {
186			if (errno == EINTR)
187			return(0);
188			error(SYSTEM, "select call failure in disp_wait");
189			}
190			if (FD_ISSET(0, &readset) \|\| FD_ISSET(0, &errset))
191	gregl	3.4	flgs \|= RDY_SRV;
192	gregl	3.1	if (FD_ISSET(odev.ifd, &readset) \|\| FD_ISSET(odev.ifd, &errset))
193	gregl	3.4	flgs \|= RDY_DEV;
194	gregl	3.23	if (sstdin != NULL && (FD_ISSET(fileno(sstdin), &readset) \|\|
195			FD_ISSET(fileno(sstdin), &errset)))
196	gregl	3.10	flgs \|= RDY_SIN;
197	gregl	3.1	return(flgs);
198			}
199
200
201	gwlarson	3.38	add_holo(hdg, gfn, pfn) /* register a new holodeck section */
202	gregl	3.1	HDGRID *hdg;
203	gwlarson	3.38	char gfn, pfn;
204	gregl	3.1	{
205			VIEW nv;
206	gregl	3.20	double d;
207	gregl	3.1	register int hd;
208
209			for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
210			;
211			if (hd >= HDMAX)
212			error(INTERNAL, "too many holodeck sections in add_holo");
213			hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
214			if (hdlist[hd] == NULL)
215			error(SYSTEM, "out of memory in add_holo");
216			bcopy((char )hdg, (char )hdlist[hd], sizeof(HDGRID));
217			hdcompgrid(hdlist[hd]);
218	gwlarson	3.38	hdgfn[hd] = savestr(gfn);
219			hdpfn[hd] = pfn && pfn ? savestr(pfn) : (char )NULL;
220	gregl	3.1	if (hd)
221			return;
222			/* set initial viewpoint */
223			copystruct(&nv, &odev.v);
224			VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
225			VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
226			VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
227			fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
228			VCOPY(nv.vup, hdlist[0]->xv[2]);
229	gregl	3.20	if (do_outside) {
230			normalize(nv.vdir);
231			d = VLEN(hdlist[0]->xv[1]);
232			d += VLEN(hdlist[0]->xv[2]);
233			VSUM(nv.vp, nv.vp, nv.vdir, -d);
234			}
235	gregl	3.1	new_view(&nv);
236			}
237
238
239			disp_bundle(p) /* display a ray bundle */
240			register PACKHEAD *p;
241			{
242			GCOORD gc[2];
243			FVECT ro, rd, wp;
244			double d;
245			register int i;
246			/* get beam coordinates */
247			if (p->hd < 0 \| p->hd >= HDMAX \|\| hdlist[p->hd] == NULL)
248			error(INTERNAL, "bad holodeck number in disp_bundle");
249			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
250			error(INTERNAL, "bad beam index in disp_bundle");
251			/* display each ray */
252			for (i = p->nr; i--; ) {
253			hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
254			d = hddepth(hdlist[p->hd], packra(p)[i].d);
255	gwlarson	3.29	if (d < .99*FHUGE) {
256			VSUM(wp, ro, rd, d); /* might be behind viewpoint */
257			dev_value(packra(p)[i].v, rd, wp);
258			} else
259			dev_value(packra(p)[i].v, rd, NULL);
260	gregl	3.1	}
261	gregl	3.21	#ifdef DEBUG
262			if (imm_mode) nimmrays += p->nr;
263			else naddrays += p->nr;
264			#endif
265	gregl	3.1	}
266
267
268			new_view(v) /* change view parameters */
269	gregl	3.12	register VIEW *v;
270	gregl	3.1	{
271	gregl	3.12	static VIEW viewhist[VIEWHISTLEN];
272			static unsigned nhist;
273	gwlarson	3.24	VIEW *dv;
274	gwlarson	3.40	int i, res[2];
275			int2 *slist;
276	gregl	3.1	char *err;
277	gregl	3.12	/* restore previous view? */
278			if (v == NULL) {
279	gregl	3.16	if (nhist > 1) /* get one before last setting */
280			nhist--;
281			else /* else go to end of list */
282			while (nhist < VIEWHISTLEN && viewhist[nhist].type)
283			nhist++;
284	gregl	3.12	v = viewhist + ((nhist-1)%VIEWHISTLEN);
285	gregl	3.17	} else
286			again:
287			if ((err = setview(v)) != NULL) {
288	gregl	3.12	error(COMMAND, err);
289			return;
290			}
291	gwlarson	3.37	if (!dev_view(v)) /* notify display driver */
292			goto again;
293	gregl	3.12	if (v->type == VT_PAR) {
294			error(COMMAND, "cannot handle parallel views");
295			return;
296			}
297	gwlarson	3.37	beam_init(odev.firstuse); /* compute new beam set */
298			for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++) {
299			if ((slist = beam_view(dv, res[0], res[1])) == NULL) {
300	gwlarson	3.24	if (!nhist) {
301			error(COMMAND, "invalid starting view");
302			return;
303			}
304			copystruct(v, viewhist + ((nhist-1)%VIEWHISTLEN));
305	gwlarson	3.37	goto again; /* poss. overloading dev_section()? */
306			}
307			DCHECK(*slist < 0, WARNING, "no visible sections in new_view");
308	gwlarson	3.38	for ( ; *slist >= 0; slist++)
309			dev_section(hdgfn[slist], hdpfn[slist]);
310	gwlarson	3.37	}
311	gwlarson	3.38	dev_section(NULL,NULL); /* end section list */
312	gwlarson	3.37	dev_flush(); /* update display */
313	gwlarson	3.34	/* update server */
314	gwlarson	3.37	imm_mode = beam_sync(odev.firstuse) > 0;
315	gregl	3.12	/* record new view */
316			if (v < viewhist \|\| v >= viewhist+VIEWHISTLEN) {
317			copystruct(viewhist + (nhist%VIEWHISTLEN), v);
318			nhist++;
319			}
320	gregl	3.10	}
321
322
323	gwlarson	3.36	set_focus(args) /* set focus frame */
324			char *args;
325			{
326			double hcent, vcent, hsiz, vsiz;
327			VIEW *dv, vwfocus;
328			int i, res[2];
329
330			i = sscanf(args, "%lf %lf %lf %lf", &hcent, &vcent, &hsiz, &vsiz);
331			if (i < 2 \|\| hcent < 0 \|\| hcent > 1 \|\| vcent < 0 \|\| vcent > 1) {
332			beam_init(0); /* restore view */
333			for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++)
334			beam_view(dv, res[0], res[1]);
335			beam_sync(0); /* update server */
336			return;
337			}
338			if (i < 4 \|\| hsiz <= hcent \|\| hsiz > 1 \|\| vsiz <= vcent \|\| vsiz > 1)
339			hsiz = vsiz = FSIZDEF; /* gave center only */
340			else {
341			hsiz -= hcent; hcent += 0.5hsiz; / gave min and max */
342			vsiz -= vcent; vcent += 0.5*vsiz;
343			}
344			beam_init(0); /* add basic views */
345			for (i = 0; (dv = dev_auxview(i, res)) != NULL; i++)
346			beam_view(dv, res[0]>>4, res[1]>>4);
347			copystruct(&vwfocus, &odev.v); /* add focus view */
348			switch (odev.v.type) {
349			case VT_PER:
350			vwfocus.horiz = 2.180./PIatan(
351			hsiz * tan(PI/180./2.*odev.v.horiz) );
352			vwfocus.vert = 2.180./PIatan(
353			vsiz * tan(PI/180./2.*odev.v.vert) );
354			break;
355			case VT_PAR:
356			case VT_ANG:
357			vwfocus.horiz = hsiz * odev.v.horiz;
358			vwfocus.vert = vsiz * odev.v.vert;
359			break;
360			case VT_HEM:
361			vwfocus.horiz = 2.180./PIasin(
362			hsiz * sin(PI/180./2.*odev.v.horiz) );
363			vwfocus.vert = 2.180./PIasin(
364			vsiz * sin(PI/180./2.*odev.v.vert) );
365			break;
366			case VT_CYL:
367			vwfocus.horiz = hsiz * odev.v.horiz;
368			vwfocus.vert = 2.180./PIatan(
369			vsiz * tan(PI/180./2.*odev.v.vert) );
370			break;
371			default:
372			error(INTERNAL, "bad view type in set_focus");
373			}
374			vwfocus.hoff = (odev.v.hoff + hcent - 0.5)/hsiz;
375			vwfocus.voff = (odev.v.voff + vcent - 0.5)/vsiz;
376			setview(&vwfocus);
377			beam_view(&vwfocus, (int)(3odev.hreshsiz)+100,
378			(int)(3odev.vresvsiz)+100);
379			beam_sync(0); /* update server */
380			}
381
382
383	gregl	3.10	int
384			usr_input() /* get user input and process it */
385			{
386			VIEW vparams;
387	gregl	3.23	char cmd[256];
388	gregl	3.10	register char *args;
389	gregl	3.11	register int i;
390	gregl	3.10
391	gregl	3.23	if (fgets(cmd, sizeof(cmd), sstdin) == NULL) {
392			fclose(sstdin);
393			sstdin = NULL;
394	gwlarson	3.26	return(-1);
395	gregl	3.23	}
396	gwlarson	3.31	if (*cmd == '\n')
397	gwlarson	3.26	return(DC_RESUME);
398	gregl	3.10	for (args = cmd; args && !isspace(args); args++)
399			;
400			while (isspace(*args))
401			*args++ = '\0';
402	gregl	3.11	if (*args && args[i=strlen(args)-1] == '\n')
403			args[i] = '\0';
404			for (i = 0; i < DC_NCMDS; i++)
405			if (!strcmp(cmd, cmdlist[i]))
406	gregl	3.10	break;
407	gregl	3.11	if (i >= DC_NCMDS) {
408	gwlarson	3.26	dev_auxcom(cmd, args);
409	gregl	3.10	return(-1);
410			}
411	gregl	3.11	switch (i) {
412	gregl	3.10	case DC_SETVIEW: /* set the view */
413			copystruct(&vparams, &odev.v);
414			if (!sscanview(&vparams, args))
415			error(COMMAND, "missing view options");
416			else
417			new_view(&vparams);
418			break;
419			case DC_GETVIEW: /* print the current view */
420			printview();
421	gregl	3.12	break;
422			case DC_LASTVIEW: /* restore previous view */
423			new_view(NULL);
424	gwlarson	3.36	break;
425			case DC_FOCUS: /* set focus frame */
426			set_focus(args);
427	gregl	3.10	break;
428			case DC_PAUSE: /* pause the current calculation */
429			case DC_RESUME: /* resume the calculation */
430			/* handled in main() */
431	gregl	3.13	break;
432			case DC_REDRAW: /* redraw from server */
433	gwlarson	3.24	imm_mode = beam_sync(1) > 0;
434	gregl	3.22	dev_clear();
435	gregl	3.14	break;
436			case DC_KILL: /* kill rtrace process(es) */
437			serv_request(DR_KILL, 0, NULL);
438			break;
439			case DC_CLOBBER: /* clobber holodeck */
440			serv_request(DR_CLOBBER, 0, NULL);
441			break;
442			case DC_RESTART: /* restart rtrace */
443			serv_request(DR_RESTART, 0, NULL);
444	gregl	3.10	break;
445			case DC_QUIT: /* quit request */
446			serv_request(DR_SHUTDOWN, 0, NULL);
447			break;
448			default:
449			error(CONSISTENCY, "bad command id in usr_input");
450			}
451	gregl	3.11	return(i);
452	gregl	3.10	}
453
454
455			printview() /* print our current view to server stdout */
456			{
457			fputs(VIEWSTR, sstdout);
458			fprintview(&odev.v, sstdout);
459			fputc('\n', sstdout);
460			fflush(sstdout);
461	gregl	3.1	}
462
463
464			int
465			serv_result() /* get next server result and process it */
466			{
467			static char *buf = NULL;
468			static int bufsiz = 0;
469			MSGHEAD msg;
470			int n;
471			/* read message header */
472			if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
473			goto readerr;
474			if (msg.nbytes > 0) { /* get the message body */
475			if (msg.nbytes > bufsiz) {
476			if (buf == NULL)
477			buf = (char *)malloc(bufsiz=msg.nbytes);
478			else
479			buf = (char *)realloc(buf, bufsiz=msg.nbytes);
480			if (buf == NULL)
481			error(SYSTEM, "out of memory in serv_result");
482			}
483			if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
484			goto readerr;
485			}
486			switch (msg.type) { /* process results */
487			case DS_BUNDLE:
488			if (msg.nbytes < sizeof(PACKHEAD) \|\|
489			msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
490			error(INTERNAL, "bad display packet from server");
491			disp_bundle((PACKHEAD *)buf);
492			break;
493			case DS_ADDHOLO:
494	gwlarson	3.38	if (msg.nbytes < sizeof(HDGRID)+2)
495	gregl	3.1	error(INTERNAL, "bad holodeck record from server");
496	gwlarson	3.38	add_holo((HDGRID *)buf, buf+sizeof(HDGRID),
497			buf+sizeof(HDGRID)+strlen(buf+sizeof(HDGRID))+1);
498	gregl	3.20	break;
499			case DS_OUTSECT:
500			do_outside = 1;
501	gwlarson	3.28	goto noargs;
502	gwlarson	3.25	case DS_EYESEP:
503			if (msg.nbytes <= 1 \|\| (eyesepdist = atof(buf)) <= FTINY)
504			error(INTERNAL, "bad eye separation from server");
505	gregl	3.1	break;
506			case DS_STARTIMM:
507			case DS_ENDIMM:
508	gwlarson	3.39	if (!(imm_mode = msg.type==DS_STARTIMM))
509			dev_flush();
510	gregl	3.21	#ifdef DEBUG
511	gwlarson	3.35	{
512	gregl	3.21	time_t tnow = time(NULL);
513	gwlarson	3.35	if (msg.type==DS_STARTIMM) tadd += tnow - tmodesw;
514			else timm += tnow - tmodesw;
515	gregl	3.21	tmodesw = tnow;
516			}
517			#endif
518	gwlarson	3.28	goto noargs;
519	gregl	3.1	case DS_ACKNOW:
520			case DS_SHUTDOWN:
521	gwlarson	3.28	goto noargs;
522	gregl	3.1	default:
523			error(INTERNAL, "unrecognized result from server process");
524			}
525			return(msg.type); /* return message type */
526	gwlarson	3.28	noargs:
527			if (msg.nbytes) {
528			sprintf(errmsg, "unexpected body with server message %d",
529			msg.type);
530			error(INTERNAL, errmsg);
531			}
532			return(msg.type);
533	gregl	3.1	readerr:
534			if (feof(stdin))
535			error(SYSTEM, "server process died");
536			error(SYSTEM, "error reading from server process");
537			}
538
539
540			serv_request(type, nbytes, p) /* send a request to the server process */
541			int type, nbytes;
542			char *p;
543			{
544			MSGHEAD msg;
545			int m;
546	gwlarson	3.33	/* consistency checks */
547	gwlarson	3.37	DCHECK(nbytes < 0 \|\| nbytes > 0 & p == NULL,
548			CONSISTENCY, "bad buffer handed to serv_request");
549	gregl	3.1	/* get server's attention for big request */
550			if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
551			serv_request(DR_ATTEN, 0, NULL);
552			while ((m = serv_result()) != DS_ACKNOW)
553			if (m == DS_SHUTDOWN) /* the bugger quit on us */
554			quit(0);
555			}
556			msg.type = type; /* write and flush the message */
557			msg.nbytes = nbytes;
558			fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
559			if (nbytes > 0)
560			fwrite(p, 1, nbytes, stdout);
561			if (fflush(stdout) < 0)
562			error(SYSTEM, "write error in serv_request");
563	gregl	3.2	}
564
565
566			eputs(s) /* put error message to stderr */
567			register char *s;
568			{
569			static int midline = 0;
570
571			if (!*s)
572			return;
573			if (!midline++) { /* prepend line with program name */
574			fputs(progname, stderr);
575			fputs(": ", stderr);
576			}
577			fputs(s, stderr);
578			if (s[strlen(s)-1] == '\n') {
579			fflush(stderr);
580			midline = 0;
581			}
582	gregl	3.1	}
583
584
585			quit(code) /* clean up and exit */
586			int code;
587			{
588	gwlarson	3.38	if (code)
589			exit(code);
590	gregl	3.1	if (odev.v.type)
591			dev_close();
592	gwlarson	3.38	exit(0);
593	gregl	3.1	}