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"

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

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

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

#define RDY_SRV 01
#define RDY_DEV 02


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

        progname = argv[0];
        if (argc != 2)
                error(USER, "bad command line arguments");
                                        /* open our device */
        dev_open(argv[1]);
                                        /* enter main loop */
        do {
                rdy = disp_wait();
                if (rdy & RDY_DEV) {            /* get user input */
                        inp = dev_input();
                        if (inp & DEV_NEWVIEW)
                                new_view(&odev.v);
                        if (inp & DEV_SHUTDOWN)
                                serv_request(DR_SHUTDOWN, 0, NULL);
                        if (inp & DEV_REDRAW) {
                                imm_mode = 1;   /* preempt updates */
                                beam_sync();
                        }
                        if (inp & DEV_WAIT)
                                pause = 1;
                        if (inp & DEV_RESUME) {
                                serv_request(DR_NOOP, 0, NULL);
                                pause = 0;
                        }
                }
                if (rdy & RDY_SRV) {            /* get 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 (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;
        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;
        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);
        }
}


new_view(v)                     /* change view parameters */
VIEW    *v;
{
        char    *err;

        do {
                if ((err = setview(v)) != NULL)
                        error(INTERNAL, err);
                dev_view(v);            /* update display driver */
                dev_flush();            /* update screen */
        } while (!beam_view(v));        /* update beam list */
}


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;
                if (msg.type == DS_ENDIMM)
                        dev_flush();            /* update display NOW */
                /* 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:	3.8
Committed:	Thu Dec 4 10:51:37 1997 UTC (26 years, 4 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 3.7:	+6 -5 lines
Log Message:	added guard for inappropriate moves
#	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
16			HOLO hdlist[HDMAX+1]; / global holodeck list */
17
18			int imm_mode = 0; /* bundles are being delivered immediately */
19
20			char progname; / global argv[0] */
21
22	gregl	3.4	#define RDY_SRV 01
23			#define RDY_DEV 02
24	gregl	3.1
25
26			main(argc, argv)
27			int argc;
28			char *argv[];
29			{
30	gregl	3.3	int rdy, inp, res = 0, pause = 0;
31	gregl	3.1
32			progname = argv[0];
33			if (argc != 2)
34			error(USER, "bad command line arguments");
35			/* open our device */
36			dev_open(argv[1]);
37			/* enter main loop */
38			do {
39			rdy = disp_wait();
40	gregl	3.4	if (rdy & RDY_DEV) { /* get user input */
41	gregl	3.3	inp = dev_input();
42	gregl	3.2	if (inp & DEV_NEWVIEW)
43			new_view(&odev.v);
44	gregl	3.1	if (inp & DEV_SHUTDOWN)
45			serv_request(DR_SHUTDOWN, 0, NULL);
46	gregl	3.4	if (inp & DEV_REDRAW) {
47	gregl	3.5	imm_mode = 1; /* preempt updates */
48	gregl	3.4	beam_sync();
49			}
50	gregl	3.2	if (inp & DEV_WAIT)
51	gregl	3.3	pause = 1;
52			if (inp & DEV_RESUME) {
53			serv_request(DR_NOOP, 0, NULL);
54			pause = 0;
55			}
56			}
57	gregl	3.4	if (rdy & RDY_SRV) { /* get server result */
58	gregl	3.3	res = serv_result();
59			if (pause && res != DS_SHUTDOWN) {
60	gregl	3.2	serv_request(DR_ATTEN, 0, NULL);
61	gregl	3.3	while ((res = serv_result()) != DS_ACKNOW &&
62			res != DS_SHUTDOWN)
63			;
64			}
65	gregl	3.2	}
66	gregl	3.1	} while (res != DS_SHUTDOWN);
67			/* all done */
68			quit(0);
69			}
70
71
72			int
73			disp_wait() /* wait for more input */
74			{
75			fd_set readset, errset;
76			int flgs;
77			int n;
78			register int i;
79			/* see if we can avoid select call */
80			if (imm_mode \|\| stdin->_cnt > 0)
81	gregl	3.4	return(RDY_SRV);
82	gregl	3.1	if (dev_flush())
83	gregl	3.4	return(RDY_DEV);
84	gregl	3.1	/* make the call */
85			FD_ZERO(&readset); FD_ZERO(&errset);
86			FD_SET(0, &readset);
87			FD_SET(0, &errset);
88			FD_SET(odev.ifd, &readset);
89			FD_SET(odev.ifd, &errset);
90			n = odev.ifd + 1;
91			n = select(n, &readset, NULL, &errset, NULL);
92			if (n < 0) {
93			if (errno == EINTR)
94			return(0);
95			error(SYSTEM, "select call failure in disp_wait");
96			}
97			flgs = 0; /* flag what's ready */
98			if (FD_ISSET(0, &readset) \|\| FD_ISSET(0, &errset))
99	gregl	3.4	flgs \|= RDY_SRV;
100	gregl	3.1	if (FD_ISSET(odev.ifd, &readset) \|\| FD_ISSET(odev.ifd, &errset))
101	gregl	3.4	flgs \|= RDY_DEV;
102	gregl	3.1	return(flgs);
103			}
104
105
106			add_holo(hdg) /* register a new holodeck section */
107			HDGRID *hdg;
108			{
109			VIEW nv;
110			register int hd;
111
112			for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
113			;
114			if (hd >= HDMAX)
115			error(INTERNAL, "too many holodeck sections in add_holo");
116			hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
117			if (hdlist[hd] == NULL)
118			error(SYSTEM, "out of memory in add_holo");
119			bcopy((char )hdg, (char )hdlist[hd], sizeof(HDGRID));
120			hdcompgrid(hdlist[hd]);
121			if (hd)
122			return;
123			/* set initial viewpoint */
124			copystruct(&nv, &odev.v);
125			VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
126			VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
127			VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
128			fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
129			VCOPY(nv.vup, hdlist[0]->xv[2]);
130			new_view(&nv);
131			}
132
133
134			disp_bundle(p) /* display a ray bundle */
135			register PACKHEAD *p;
136			{
137			GCOORD gc[2];
138			FVECT ro, rd, wp;
139			double d;
140			register int i;
141			/* get beam coordinates */
142			if (p->hd < 0 \| p->hd >= HDMAX \|\| hdlist[p->hd] == NULL)
143			error(INTERNAL, "bad holodeck number in disp_bundle");
144			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
145			error(INTERNAL, "bad beam index in disp_bundle");
146			/* display each ray */
147			for (i = p->nr; i--; ) {
148			hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
149			d = hddepth(hdlist[p->hd], packra(p)[i].d);
150			VSUM(wp, ro, rd, d); /* might be behind viewpoint */
151			dev_value(packra(p)[i].v, wp);
152			}
153			}
154
155
156			new_view(v) /* change view parameters */
157			VIEW *v;
158			{
159			char *err;
160
161	gregl	3.8	do {
162			if ((err = setview(v)) != NULL)
163			error(INTERNAL, err);
164			dev_view(v); /* update display driver */
165			dev_flush(); /* update screen */
166			} while (!beam_view(v)); /* update beam list */
167	gregl	3.1	}
168
169
170			int
171			serv_result() /* get next server result and process it */
172			{
173			static char *buf = NULL;
174			static int bufsiz = 0;
175			MSGHEAD msg;
176			int n;
177			/* read message header */
178			if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
179			goto readerr;
180			if (msg.nbytes > 0) { /* get the message body */
181			if (msg.nbytes > bufsiz) {
182			if (buf == NULL)
183			buf = (char *)malloc(bufsiz=msg.nbytes);
184			else
185			buf = (char *)realloc(buf, bufsiz=msg.nbytes);
186			if (buf == NULL)
187			error(SYSTEM, "out of memory in serv_result");
188			}
189			if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
190			goto readerr;
191			}
192			switch (msg.type) { /* process results */
193			case DS_BUNDLE:
194			if (msg.nbytes < sizeof(PACKHEAD) \|\|
195			msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
196			error(INTERNAL, "bad display packet from server");
197			disp_bundle((PACKHEAD *)buf);
198			break;
199			case DS_ADDHOLO:
200			if (msg.nbytes != sizeof(HDGRID))
201			error(INTERNAL, "bad holodeck record from server");
202			add_holo((HDGRID *)buf);
203			break;
204			case DS_STARTIMM:
205			case DS_ENDIMM:
206			imm_mode = msg.type==DS_STARTIMM;
207	gregl	3.7	if (msg.type == DS_ENDIMM)
208			dev_flush(); /* update display NOW */
209	gregl	3.1	/* fall through */
210			case DS_ACKNOW:
211			case DS_SHUTDOWN:
212			if (msg.nbytes) {
213			sprintf(errmsg,
214			"unexpected body with server message %d",
215			msg.type);
216			error(INTERNAL, errmsg);
217			}
218			break;
219			default:
220			error(INTERNAL, "unrecognized result from server process");
221			}
222			return(msg.type); /* return message type */
223			readerr:
224			if (feof(stdin))
225			error(SYSTEM, "server process died");
226			error(SYSTEM, "error reading from server process");
227			}
228
229
230			serv_request(type, nbytes, p) /* send a request to the server process */
231			int type, nbytes;
232			char *p;
233			{
234			MSGHEAD msg;
235			int m;
236			/* get server's attention for big request */
237			if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
238			serv_request(DR_ATTEN, 0, NULL);
239			while ((m = serv_result()) != DS_ACKNOW)
240			if (m == DS_SHUTDOWN) /* the bugger quit on us */
241			quit(0);
242			}
243			msg.type = type; /* write and flush the message */
244			msg.nbytes = nbytes;
245			fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
246			if (nbytes > 0)
247			fwrite(p, 1, nbytes, stdout);
248			if (fflush(stdout) < 0)
249			error(SYSTEM, "write error in serv_request");
250	gregl	3.2	}
251
252
253			eputs(s) /* put error message to stderr */
254			register char *s;
255			{
256			static int midline = 0;
257
258			if (!*s)
259			return;
260			if (!midline++) { /* prepend line with program name */
261			fputs(progname, stderr);
262			fputs(": ", stderr);
263			}
264			fputs(s, stderr);
265			if (s[strlen(s)-1] == '\n') {
266			fflush(stderr);
267			midline = 0;
268			}
269	gregl	3.1	}
270
271
272			quit(code) /* clean up and exit */
273			int code;
274			{
275			if (odev.v.type)
276			dev_close();
277			exit(code);
278			}