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gregl |
3.1 |
/* 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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VIEW dvw; /* our current display view */ |
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char *progname; /* global argv[0] */ |
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#define SERV_READY 01 |
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#define DEV_READY 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; |
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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 & DEV_READY) { |
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inp = dev_input(); /* take residual action here */ |
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if (inp & DEV_SHUTDOWN) |
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serv_request(DR_SHUTDOWN, 0, NULL); |
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else if (inp & DEV_NEWVIEW) |
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new_view(&odev.v); |
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} |
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if (rdy & SERV_READY) |
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res = serv_result(); /* processes result, also */ |
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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(SERV_READY); |
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if (dev_flush()) |
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return(DEV_READY); |
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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 |= SERV_READY; |
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if (FD_ISSET(odev.ifd, &readset) || FD_ISSET(odev.ifd, &errset)) |
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flgs |= DEV_READY; |
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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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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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beam_view(&dvw, v); /* update beam list */ |
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copystruct(&dvw, v); /* record new view */ |
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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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/* 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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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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} |
