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/* Copyright (c) 1997 Silicon Graphics, Inc. */
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#ifndef lint
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static char SCCSid[] = "$SunId$ SGI";
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#endif
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/*
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* Holodeck display process.
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*/
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#include "rholo.h"
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#include "rhdisp.h"
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#include "rhdriver.h"
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#include "selcall.h"
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HOLO *hdlist[HDMAX+1]; /* global holodeck list */
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int imm_mode = 0; /* bundles are being delivered immediately */
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char *progname; /* global argv[0] */
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#define RDY_SRV 01
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#define RDY_DEV 02
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int rdy, inp, res = 0, pause = 0;
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progname = argv[0];
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if (argc != 2)
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error(USER, "bad command line arguments");
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/* open our device */
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dev_open(argv[1]);
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/* enter main loop */
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do {
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rdy = disp_wait();
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if (rdy & RDY_DEV) { /* get user input */
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inp = dev_input();
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if (inp & DEV_NEWVIEW)
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new_view(&odev.v);
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if (inp & DEV_SHUTDOWN)
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serv_request(DR_SHUTDOWN, 0, NULL);
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if (inp & DEV_REDRAW) {
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imm_mode = 1; /* preempt updates */
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beam_sync();
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}
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if (inp & DEV_WAIT)
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pause = 1;
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if (inp & DEV_RESUME) {
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serv_request(DR_NOOP, 0, NULL);
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pause = 0;
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}
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}
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if (rdy & RDY_SRV) { /* get server result */
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res = serv_result();
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if (pause && res != DS_SHUTDOWN) {
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serv_request(DR_ATTEN, 0, NULL);
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while ((res = serv_result()) != DS_ACKNOW &&
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res != DS_SHUTDOWN)
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;
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}
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}
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} while (res != DS_SHUTDOWN);
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/* all done */
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quit(0);
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}
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int
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disp_wait() /* wait for more input */
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{
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fd_set readset, errset;
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int flgs;
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int n;
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register int i;
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/* see if we can avoid select call */
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if (imm_mode || stdin->_cnt > 0)
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return(RDY_SRV);
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if (dev_flush())
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return(RDY_DEV);
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/* make the call */
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FD_ZERO(&readset); FD_ZERO(&errset);
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FD_SET(0, &readset);
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FD_SET(0, &errset);
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FD_SET(odev.ifd, &readset);
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FD_SET(odev.ifd, &errset);
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n = odev.ifd + 1;
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n = select(n, &readset, NULL, &errset, NULL);
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if (n < 0) {
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if (errno == EINTR)
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return(0);
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error(SYSTEM, "select call failure in disp_wait");
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}
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flgs = 0; /* flag what's ready */
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if (FD_ISSET(0, &readset) || FD_ISSET(0, &errset))
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flgs |= RDY_SRV;
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if (FD_ISSET(odev.ifd, &readset) || FD_ISSET(odev.ifd, &errset))
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flgs |= RDY_DEV;
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return(flgs);
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}
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add_holo(hdg) /* register a new holodeck section */
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HDGRID *hdg;
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{
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VIEW nv;
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register int hd;
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for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
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;
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if (hd >= HDMAX)
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error(INTERNAL, "too many holodeck sections in add_holo");
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hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
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if (hdlist[hd] == NULL)
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error(SYSTEM, "out of memory in add_holo");
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bcopy((char *)hdg, (char *)hdlist[hd], sizeof(HDGRID));
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hdcompgrid(hdlist[hd]);
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if (hd)
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return;
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/* set initial viewpoint */
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copystruct(&nv, &odev.v);
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VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
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VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
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VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
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fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
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VCOPY(nv.vup, hdlist[0]->xv[2]);
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new_view(&nv);
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}
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disp_bundle(p) /* display a ray bundle */
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register PACKHEAD *p;
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{
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GCOORD gc[2];
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FVECT ro, rd, wp;
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double d;
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register int i;
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/* get beam coordinates */
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if (p->hd < 0 | p->hd >= HDMAX || hdlist[p->hd] == NULL)
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error(INTERNAL, "bad holodeck number in disp_bundle");
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if (!hdbcoord(gc, hdlist[p->hd], p->bi))
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error(INTERNAL, "bad beam index in disp_bundle");
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/* display each ray */
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for (i = p->nr; i--; ) {
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hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
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d = hddepth(hdlist[p->hd], packra(p)[i].d);
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VSUM(wp, ro, rd, d); /* might be behind viewpoint */
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dev_value(packra(p)[i].v, wp);
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}
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}
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new_view(v) /* change view parameters */
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VIEW *v;
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{
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char *err;
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do {
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if ((err = setview(v)) != NULL)
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error(INTERNAL, err);
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dev_view(v); /* update display driver */
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dev_flush(); /* update screen */
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} while (!beam_view(v)); /* update beam list */
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}
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int
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serv_result() /* get next server result and process it */
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{
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static char *buf = NULL;
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static int bufsiz = 0;
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MSGHEAD msg;
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int n;
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/* read message header */
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if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
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goto readerr;
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if (msg.nbytes > 0) { /* get the message body */
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if (msg.nbytes > bufsiz) {
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if (buf == NULL)
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buf = (char *)malloc(bufsiz=msg.nbytes);
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else
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buf = (char *)realloc(buf, bufsiz=msg.nbytes);
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if (buf == NULL)
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error(SYSTEM, "out of memory in serv_result");
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}
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if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
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goto readerr;
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}
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switch (msg.type) { /* process results */
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case DS_BUNDLE:
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if (msg.nbytes < sizeof(PACKHEAD) ||
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msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
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error(INTERNAL, "bad display packet from server");
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disp_bundle((PACKHEAD *)buf);
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break;
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case DS_ADDHOLO:
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if (msg.nbytes != sizeof(HDGRID))
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error(INTERNAL, "bad holodeck record from server");
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add_holo((HDGRID *)buf);
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break;
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case DS_STARTIMM:
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case DS_ENDIMM:
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imm_mode = msg.type==DS_STARTIMM;
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if (msg.type == DS_ENDIMM)
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dev_flush(); /* update display NOW */
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/* fall through */
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case DS_ACKNOW:
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case DS_SHUTDOWN:
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if (msg.nbytes) {
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sprintf(errmsg,
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"unexpected body with server message %d",
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msg.type);
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error(INTERNAL, errmsg);
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}
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break;
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default:
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error(INTERNAL, "unrecognized result from server process");
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}
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return(msg.type); /* return message type */
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readerr:
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if (feof(stdin))
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error(SYSTEM, "server process died");
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error(SYSTEM, "error reading from server process");
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}
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serv_request(type, nbytes, p) /* send a request to the server process */
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int type, nbytes;
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char *p;
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{
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MSGHEAD msg;
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int m;
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/* get server's attention for big request */
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if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
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serv_request(DR_ATTEN, 0, NULL);
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while ((m = serv_result()) != DS_ACKNOW)
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if (m == DS_SHUTDOWN) /* the bugger quit on us */
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quit(0);
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}
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msg.type = type; /* write and flush the message */
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msg.nbytes = nbytes;
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fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
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if (nbytes > 0)
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fwrite(p, 1, nbytes, stdout);
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if (fflush(stdout) < 0)
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error(SYSTEM, "write error in serv_request");
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}
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eputs(s) /* put error message to stderr */
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register char *s;
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{
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static int midline = 0;
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if (!*s)
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return;
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if (!midline++) { /* prepend line with program name */
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fputs(progname, stderr);
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fputs(": ", stderr);
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}
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fputs(s, stderr);
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if (s[strlen(s)-1] == '\n') {
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fflush(stderr);
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midline = 0;
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}
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}
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quit(code) /* clean up and exit */
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int code;
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{
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if (odev.v.type)
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dev_close();
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exit(code);
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}
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