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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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|
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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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/* |
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* Copy data into a holodeck file |
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*/ |
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|
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#include "holo.h" |
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#include "view.h" |
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#include "resolu.h" |
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|
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int frompicz; /* input from pictures & depth-buffers? */ |
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int noutsects; /* number of output sections */ |
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int obstructions = -1; /* interior obstructions allowed? */ |
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|
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char *progname; /* global argv[0] */ |
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|
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|
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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 i; |
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|
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progname = argv[0]; |
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if (argc < 4) |
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goto userr; |
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if (!strcmp(argv[2], "-h")) |
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frompicz = 0; |
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else if (!strcmp(argv[2], "-pz")) |
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frompicz = 1; |
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else |
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goto userr; |
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if (frompicz && (argc-3)%2) |
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goto userr; |
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noutsects = openholo(argv[1], 1); |
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if (frompicz) |
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for (i = 3; i < argc; i += 2) |
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addpicz(argv[i], argv[i+1]); |
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else |
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for (i = 3; i < argc; i++) |
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addholo(argv[i]); |
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quit(0); |
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userr: |
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fprintf(stderr, "Usage: %s output.hdk -h inp1.hdk ..\n", progname); |
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fprintf(stderr, " Or: %s output.hdk -pz inp1.pic inp1.zbf ..\n", |
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progname); |
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exit(1); |
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} |
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|
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|
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holheadline(s, bf) /* check holodeck header line */ |
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register char *s; |
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int *bf; |
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{ |
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char fmt[32]; |
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|
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if (formatval(fmt, s)) { |
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*bf = strcmp(fmt, HOLOFMT); |
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return; |
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} |
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if (!strncmp(s, "OBSTRUCTIONS=", 13)) { |
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s += 13; |
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while (*s == ' ') s++; |
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if (*s == 't' | *s == 'T') |
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obstructions = 1; |
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else if (*s == 'f' | *s == 'F') |
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obstructions = 0; |
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else |
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error(WARNING, "bad OBSTRUCTIONS value in holodeck"); |
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return; |
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} |
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} |
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|
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|
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int |
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openholo(fname, append) /* open existing holodeck file for i/o */ |
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char *fname; |
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int append; |
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{ |
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extern long ftell(); |
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FILE *fp; |
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int fd; |
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int badfmt = 0; |
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int4 nextloc; |
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int n; |
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/* open holodeck file */ |
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if ((fp = fopen(fname, append ? "r+" : "r")) == NULL) { |
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sprintf(errmsg, "cannot open \"%s\" for %s", fname, |
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append ? "appending" : "reading"); |
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error(SYSTEM, errmsg); |
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} |
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/* check header and magic number */ |
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if (append) |
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badfmt |= getheader(fp, holheadline, &badfmt) < 0; |
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else |
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badfmt = checkheader(fp, HOLOFMT, NULL) < 0; |
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if (badfmt || getw(fp) != HOLOMAGIC) { |
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sprintf(errmsg, "file \"%s\" not in holodeck format", fname); |
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error(USER, errmsg); |
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} |
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fd = dup(fileno(fp)); /* dup file handle */ |
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nextloc = ftell(fp); /* get stdio position */ |
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fclose(fp); /* done with stdio */ |
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for (n = 0; nextloc > 0L; n++) { /* initialize each section */ |
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lseek(fd, (long)nextloc, 0); |
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read(fd, (char *)&nextloc, sizeof(nextloc)); |
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hdinit(fd, NULL); |
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} |
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return(n); |
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} |
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|
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|
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addray(ro, rd, d, cv) /* add a ray to our output holodeck */ |
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FVECT ro, rd; |
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double d; |
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COLR cv; |
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{ |
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int sn; |
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register HOLO *hp; |
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GCOORD gc[2]; |
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BYTE rr[2][2]; |
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double d0, d1; |
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register RAYVAL *rv; |
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/* check each output section */ |
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for (sn = noutsects; sn--; ) { |
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hp = hdlist[sn]; |
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d0 = hdinter(gc, rr, &d1, hp, ro, rd); |
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if (d <= d0 || d1 < -0.001) |
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continue; /* missed section */ |
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if (obstructions > 0 && d0 < -0.001) |
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continue; /* ray starts too late */ |
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if (!obstructions && d < 0.999*d1) |
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continue; /* ray ends too soon */ |
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/* should we check for duplicates? */ |
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rv = hdnewrays(hp, hdbindex(hp, gc), 1); |
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rv->r[0][0] = rr[0][0]; rv->r[0][1] = rr[0][1]; |
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rv->r[1][0] = rr[1][0]; rv->r[1][1] = rr[1][1]; |
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copycolr(rv->v, cv); |
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rv->d = hdcode(hp, d-d0); |
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} |
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} |
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|
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|
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addholo(hdf) /* add a holodeck file */ |
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char *hdf; |
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{ |
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int fd; |
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register HOLO *hp; |
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register BEAM *bp; |
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GCOORD gc[2]; |
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FVECT ro, rd; |
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double d; |
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int i, j; |
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register int k; |
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|
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openholo(hdf, 0); /* open the holodeck for reading */ |
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fd = hdlist[noutsects]->fd; /* remember the file handle */ |
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while ((hp = hdlist[noutsects]) != NULL) { /* load each section */ |
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for (j = nbeams(hp); j > 0; j--) /* load each beam */ |
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if ((bp = hdgetbeam(hp, j)) != NULL) { |
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hdbcoord(gc, hp, j); |
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for (k = bp->nrm; k--; ) { |
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hdray(ro, rd, hp, gc, hdbray(bp)[k].r); |
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d = hddepth(hp, hdbray(bp)[k].d); |
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addray(ro, rd, d, hdbray(bp)[k].v); |
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} |
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hdfreebeam(hp, j); /* free the beam */ |
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} |
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hddone(hp); /* free the section */ |
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} |
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close(fd); /* close the file */ |
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} |
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|
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|
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struct phead { |
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VIEW vw; |
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double expos; |
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short gotview; |
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short badfmt; |
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short altprims; |
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}; |
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|
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|
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picheadline(s, ph) /* process picture header line */ |
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char *s; |
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struct phead *ph; |
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{ |
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char fmt[32]; |
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|
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if (formatval(fmt, s)) { |
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ph->badfmt = strcmp(fmt, COLRFMT); |
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return; |
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} |
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if (isprims(s)) { |
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ph->altprims++; /* don't want to deal with this */ |
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return; |
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} |
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if (isexpos(s)) { |
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ph->expos *= exposval(s); |
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return; |
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} |
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if (isview(s)) { |
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ph->gotview += sscanview(&ph->vw, s); |
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return; |
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} |
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} |
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|
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|
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addpicz(pcf, zbf) /* add a picture + depth-buffer */ |
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char *pcf, *zbf; |
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{ |
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FILE *pfp; |
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int zfd; |
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COLR *cscn; |
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float *zscn; |
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struct phead phd; |
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int eshft; |
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double emult; |
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RESOLU prs; |
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FLOAT vl[2]; |
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FVECT ro, rd; |
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double aftd; |
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COLOR ctmp; |
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int j; |
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register int i; |
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/* open files */ |
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if ((pfp = fopen(pcf, "r")) == NULL) { |
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sprintf(errmsg, "cannot open picture file \"%s\"", pcf); |
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error(SYSTEM, pcf); |
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} |
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if ((zfd = open(zbf, O_RDONLY)) < 0) { |
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sprintf(errmsg, "cannot open depth file \"%s\"", zbf); |
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error(SYSTEM, pcf); |
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} |
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/* load picture header */ |
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copystruct(&phd.vw, &stdview); |
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phd.expos = 1.0; |
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phd.badfmt = phd.gotview = phd.altprims = 0; |
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if (getheader(pfp, picheadline, &phd) < 0 || |
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phd.badfmt || !fgetsresolu(&prs, pfp)) { |
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sprintf(errmsg, "bad format for picture file \"%s\"", pcf); |
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error(USER, errmsg); |
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} |
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if (!phd.gotview || setview(&phd.vw) != NULL) { |
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sprintf(errmsg, "missing/illegal view in picture \"%s\"", |
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pcf); |
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error(USER, errmsg); |
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} |
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if (phd.altprims) { |
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sprintf(errmsg, "ignoring primary values in picture \"%s\"", |
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pcf); |
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error(WARNING, errmsg); |
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} |
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/* figure out what to do about exposure */ |
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if (phd.expos < 0.99 | phd.expos > 1.01) { |
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emult = -log(phd.expos)/log(2.); |
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eshft = emult >= 0. ? emult+.5 : emult-.5; |
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emult -= (double)eshft; |
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if (emult <= 0.01 & emult >= -0.01) |
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emult = -1.; |
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else { |
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emult = 1./phd.expos; |
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eshft = 0; |
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} |
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} else { |
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emult = -1.; |
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eshft = 0; |
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} |
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/* allocate buffers */ |
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cscn = (COLR *)malloc(scanlen(&prs)*sizeof(COLR)); |
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zscn = (float *)malloc(scanlen(&prs)*sizeof(float)); |
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if (cscn == NULL | zscn == NULL) |
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error(SYSTEM, "out of memory in addpicz"); |
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/* read and process each scanline */ |
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for (j = 0; j < numscans(&prs); j++) { |
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i = scanlen(&prs); /* read colrs */ |
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if (freadcolrs(cscn, i, pfp) < 0) { |
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sprintf(errmsg, "error reading picture \"%s\"", pcf); |
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error(USER, errmsg); |
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} |
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if (eshft) /* shift exposure */ |
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shiftcolrs(cscn, i, eshft); |
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i *= sizeof(float); /* read depth */ |
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if (read(zfd, (char *)zscn, i) != i) { |
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sprintf(errmsg, "error reading depth file \"%s\"", zbf); |
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error(USER, errmsg); |
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} |
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for (i = scanlen(&prs); i--; ) { /* do each pixel */ |
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pix2loc(vl, &prs, i, j); |
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aftd = viewray(ro, rd, &phd.vw, vl[0], vl[1]); |
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if (aftd < -FTINY) |
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continue; /* off view */ |
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if (aftd > FTINY && zscn[i] > aftd) |
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continue; /* aft clipped */ |
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if (emult > 0.) { /* whatta pain */ |
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colr_color(ctmp, cscn[i]); |
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scalecolor(ctmp, emult); |
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setcolr(cscn[i], colval(ctmp,RED), |
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colval(ctmp,GRN), colval(ctmp,BLU)); |
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} |
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addray(ro, rd, (double)zscn[i], cscn[i]); |
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} |
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} |
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/* clean up */ |
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free((char *)cscn); |
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free((char *)zscn); |
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fclose(pfp); |
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close(zfd); |
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} |
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|
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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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|
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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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|
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|
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quit(code) /* exit the program gracefully */ |
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int code; |
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{ |
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hdsync(NULL, 1); /* write out any buffered data */ |
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exit(code); |
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} |
