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/* Copyright (c) 1986 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* readoct.c - routines to read octree information.
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*
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* 7/30/85
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*/
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#include "standard.h"
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#include "octree.h"
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#include "object.h"
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#include "otypes.h"
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double atof();
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double getflt();
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long getint();
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char *getstr();
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OCTREE getfullnode(), gettree();
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static char *infn; /* input file name */
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static FILE *infp; /* input file stream */
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static OBJECT objorig; /* zeroeth object */
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static short otypmap[NUMOTYPE+8]; /* object type map */
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int
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readoct(fname, load, scene, ofn) /* read in octree from file */
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char *fname;
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int load;
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CUBE *scene;
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char *ofn[];
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{
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char sbuf[128];
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int nf;
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register int i;
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if (fname == NULL) {
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infn = "standard input";
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infp = stdin;
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} else {
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infn = fname;
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if ((infp = fopen(fname, "r")) == NULL) {
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sprintf(errmsg, "cannot open octree file \"%s\"",
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fname);
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error(SYSTEM, errmsg);
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}
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}
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/* get header */
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if (load & IO_INFO)
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copyheader(infp, stdout);
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else
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getheader(infp, NULL);
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/* check format */
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if (getint(2) != OCTMAGIC)
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octerror(USER, "invalid octree format");
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/* get boundaries */
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if (load & IO_BOUNDS) {
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for (i = 0; i < 3; i++)
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scene->cuorg[i] = atof(getstr(sbuf));
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scene->cusize = atof(getstr(sbuf));
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} else {
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for (i = 0; i < 4; i++)
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getstr(sbuf);
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}
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objorig = nobjects; /* set object offset */
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nf = 0; /* get object files */
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while (*getstr(sbuf)) {
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if (load & IO_SCENE)
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readobj(sbuf);
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if (load & IO_FILES)
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ofn[nf] = savqstr(sbuf);
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nf++;
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}
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if (load & IO_FILES)
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ofn[nf] = NULL;
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if (load & IO_TREE) {
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/* get the octree */
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scene->cutree = gettree();
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/* get the scene */
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if (nf == 0 && load & IO_SCENE) {
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for (i = 0; *getstr(sbuf); i++)
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if ((otypmap[i] = otype(sbuf)) < 0) {
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sprintf(errmsg, "unknown type \"%s\"",
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sbuf);
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octerror(WARNING, errmsg);
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}
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while (getobj() != OVOID)
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;
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}
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}
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fclose(infp);
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return(nf);
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}
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static char *
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getstr(s) /* get null-terminated string */
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char *s;
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{
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register char *cp;
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register int c;
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cp = s;
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while ((c = getc(infp)) != EOF)
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if ((*cp++ = c) == '\0')
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return(s);
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octerror(USER, "truncated octree");
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}
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static OCTREE
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getfullnode() /* get a set, return fullnode */
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{
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OBJECT set[MAXSET+1];
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register int i;
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set[0] = getint(sizeof(OBJECT));
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if (set[0] > MAXSET)
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octerror(USER, "bad set in getfullnode");
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for (i = 1; i <= set[0]; i++)
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set[i] = getint(sizeof(OBJECT)) + objorig;
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return(fullnode(set));
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}
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static long
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getint(siz) /* get a siz-byte integer */
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register int siz;
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{
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register int c;
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register long r;
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c = getc(infp);
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r = c&0x80 ? -1L : 0L; /* sign extend */
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ungetc(c, infp);
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while (siz--) {
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if ((c = getc(infp)) == EOF)
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octerror(USER, "truncated octree");
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r <<= 8;
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r |= c;
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}
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return(r);
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}
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static double
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getflt() /* get a floating point number */
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{
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extern double ldexp();
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double d;
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d = (double)getint(4)/0x7fffffff;
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return(ldexp(d, getint(1)));
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}
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static OCTREE
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gettree() /* get a pre-ordered octree */
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{
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register OCTREE ot;
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register int i;
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switch (getc(infp)) {
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case OT_EMPTY:
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return(EMPTY);
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case OT_FULL:
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return(getfullnode());
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case OT_TREE:
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if ((ot = octalloc()) == EMPTY)
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octerror(SYSTEM, "out of tree space in gettree");
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for (i = 0; i < 8; i++)
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octkid(ot, i) = gettree();
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return(ot);
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case EOF:
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octerror(USER, "truncated octree");
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default:
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octerror(USER, "damaged octree");
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}
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}
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static
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getobj() /* get next object */
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{
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char sbuf[MAXSTR];
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int obj;
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register int i;
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register OBJREC *objp;
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i = getint(1);
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if (i == -1)
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return(OVOID); /* terminator */
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if ((obj = newobject()) == OVOID)
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error(SYSTEM, "out of object space");
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objp = objptr(obj);
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if ((objp->otype = otypmap[i]) < 0)
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octerror(USER, "reference to unknown type");
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if ((objp->omod = getint(sizeof(OBJECT))) != OVOID)
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objp->omod += objorig;
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objp->oname = savqstr(getstr(sbuf));
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if (objp->oargs.nsargs = getint(2)) {
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objp->oargs.sarg = (char **)bmalloc
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(objp->oargs.nsargs*sizeof(char *));
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if (objp->oargs.sarg == NULL)
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goto memerr;
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for (i = 0; i < objp->oargs.nsargs; i++)
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objp->oargs.sarg[i] = savestr(getstr(sbuf));
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} else
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objp->oargs.sarg = NULL;
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#ifdef IARGS
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if (objp->oargs.niargs = getint(2)) {
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objp->oargs.iarg = (long *)bmalloc
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(objp->oargs.niargs*sizeof(long));
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if (objp->oargs.iarg == NULL)
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goto memerr;
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for (i = 0; i < objp->oargs.niargs; i++)
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objp->oargs.iarg[i] = getint(4);
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} else
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objp->oargs.iarg = NULL;
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#endif
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if (objp->oargs.nfargs = getint(2)) {
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objp->oargs.farg = (double *)bmalloc
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(objp->oargs.nfargs*sizeof(double));
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if (objp->oargs.farg == NULL)
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goto memerr;
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for (i = 0; i < objp->oargs.nfargs; i++)
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objp->oargs.farg[i] = getflt();
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} else
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objp->oargs.farg = NULL;
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/* initialize */
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objp->os = NULL;
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objp->lastrno = -1;
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/* insert */
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insertobject(obj);
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return(obj);
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memerr:
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error(SYSTEM, "out of memory in getobj");
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}
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static
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octerror(etyp, msg) /* octree error */
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int etyp;
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char *msg;
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{
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char msgbuf[128];
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sprintf(msgbuf, "(%s): %s", infn, msg);
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error(etyp, msgbuf);
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}
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