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#ifndef lint
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static const char RCSid[] = "$Id: readwfobj.c,v 2.4 2020/05/02 00:12:45 greg Exp $";
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#endif
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/*
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* readobj.c
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*
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* Routines for reading a Wavefront .OBJ file
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*
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* Created by Greg Ward on Wed Feb 11 2004.
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*/
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#include "rtio.h"
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#include "rterror.h"
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#include "fvect.h"
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#include "paths.h"
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#include <ctype.h>
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#include "objutil.h"
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#define MAXARG 512 /* maximum # arguments in a statement */
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static int lineno; /* current line number */
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/* read the next statement from fp */
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static int
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get_stmt(char *av[MAXARG], FILE *fp)
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{
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static char sbuf[MAXARG*16];
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register char *cp;
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register int i;
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do {
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if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL)
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return(0);
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i = 0;
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for ( ; ; ) {
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while (isspace(*cp) || *cp == '\\') {
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if (*cp == '\n')
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lineno++;
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*cp++ = '\0';
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}
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if (!*cp)
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break;
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if (i >= MAXARG-1) {
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sprintf(errmsg,
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"Too many arguments near line %d (limit %d)",
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lineno+1, MAXARG-1);
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error(WARNING, errmsg);
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break;
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}
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av[i++] = cp;
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while (*++cp && !isspace(*cp))
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;
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}
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av[i] = NULL;
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lineno++;
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} while (!i);
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return(i);
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}
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/* convert vertex string to index */
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static int
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cvtndx(VNDX vi, const Scene *sc, const VNDX ondx, const char *vs)
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{
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/* get point */
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vi[0] = atoi(vs);
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if (vi[0] > 0) {
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if ((vi[0] += ondx[0] - 1) >= sc->nverts)
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return(0);
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} else if (vi[0] < 0) {
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vi[0] += sc->nverts;
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if (vi[0] < 0)
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return(0);
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} else
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return(0);
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/* get map coord. */
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while (*vs)
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if (*vs++ == '/')
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break;
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vi[1] = atoi(vs);
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if (vi[1] > 0) {
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if ((vi[1] += ondx[1] - 1) >= sc->ntex)
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return(0);
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} else if (vi[1] < 0) {
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vi[1] += sc->ntex;
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if (vi[1] < 0)
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return(0);
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} else
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vi[1] = -1;
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/* get normal */
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while (*vs)
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if (*vs++ == '/')
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break;
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vi[2] = atoi(vs);
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if (vi[2] > 0) {
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if ((vi[2] += ondx[2] - 1) >= sc->nnorms)
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return(0);
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} else if (vi[2] < 0) {
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vi[2] += sc->nnorms;
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if (vi[2] < 0)
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return(0);
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} else
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vi[2] = -1;
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return(1);
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}
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/* report syntax error */
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static void
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syntax(const char *fn, const char *er)
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{
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sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s",
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fn, lineno, er);
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error(USER, errmsg);
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}
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/* combine multi-group name into single identifier w/o spaces */
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static char *
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group_name(int ac, char **av)
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{
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static char nambuf[256];
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char *cp;
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if (ac < 1)
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return("NO_NAME");
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if (ac == 1)
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return(av[0]);
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for (cp = nambuf; ac--; av++) {
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strcpy(cp, *av);
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while (*cp) {
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/* XXX white space disallowed by current get_stmt()
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if (isspace(*cp))
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*cp = '_';
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else
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*/
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if (*cp == '.')
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*cp = '_';
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++cp;
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}
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*cp++ = '.';
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}
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*--cp = '\0';
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return(nambuf);
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}
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/* add a new face to scene */
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static int
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add_face(Scene *sc, const VNDX ondx, int ac, char *av[])
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{
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VNDX vdef[4];
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VNDX *varr = vdef;
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Face *f = NULL;
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int i;
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if (ac < 3) /* legal polygon? */
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return(0);
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if (ac > 4) /* need to allocate array? */
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varr = (VNDX *)emalloc(ac*sizeof(VNDX));
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for (i = ac; i--; ) /* index each vertex */
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if (!cvtndx(varr[i], sc, ondx, av[i]))
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break;
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if (i < 0) /* create face if indices OK */
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f = addFace(sc, varr, ac);
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if (varr != vdef)
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efree((char *)varr);
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return(f != NULL);
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}
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/* Load a .OBJ file */
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Scene *
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loadOBJ(Scene *sc, const char *fspec)
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{
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FILE *fp;
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char *argv[MAXARG];
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int argc;
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char buf[256];
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int nstats=0, nunknown=0;
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int onfaces;
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VNDX ondx;
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if (fspec == NULL) {
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fp = stdin;
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fspec = "<stdin>";
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#if POPEN_SUPPORT
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} else if (fspec[0] == '!') {
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if ((fp = popen(fspec+1, "r")) == NULL) {
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sprintf(errmsg, "%s: cannot execute", fspec);
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error(SYSTEM, errmsg);
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return(NULL);
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}
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#endif
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} else if ((fp = fopen(fspec, "r")) == NULL) {
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sprintf(errmsg, "%s: cannot open for reading", fspec);
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error(SYSTEM, errmsg);
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return(NULL);
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}
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if (sc == NULL)
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sc = newScene();
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lineno = 0;
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onfaces = sc->nfaces;
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ondx[0] = sc->nverts;
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ondx[1] = sc->ntex;
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ondx[2] = sc->nnorms;
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while ((argc = get_stmt(argv, fp)) > 0) {
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switch (argv[0][0]) {
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case 'v': /* vertex */
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switch (argv[0][1]) {
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case '\0': /* point */
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if (badarg(argc-1,argv+1,"fff")) {
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syntax(fspec, "bad vertex");
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goto failure;
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}
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addVertex(sc, atof(argv[1]),
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atof(argv[2]),
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atof(argv[3]));
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break;
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case 't': /* texture coord. */
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if (argv[0][2])
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goto unknown;
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if (badarg(argc-1,argv+1,"ff"))
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goto unknown;
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addTexture(sc, atof(argv[1]), atof(argv[2]));
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break;
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case 'n': /* normal */
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if (argv[0][2])
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goto unknown;
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if (badarg(argc-1,argv+1,"fff")) {
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syntax(fspec, "bad normal");
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goto failure;
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}
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if (addNormal(sc, atof(argv[1]),
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atof(argv[2]),
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atof(argv[3])) < 0) {
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syntax(fspec, "zero normal");
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goto failure;
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}
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break;
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default:
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goto unknown;
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}
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break;
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case 'f': /* face */
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if (argv[0][1])
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goto unknown;
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if (!add_face(sc, ondx, argc-1, argv+1)) {
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syntax(fspec, "bad face");
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goto failure;
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}
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break;
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case 'u': /* usemtl/usemap */
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if (!strcmp(argv[0], "usemap"))
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break;
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if (strcmp(argv[0], "usemtl"))
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goto unknown;
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if (argc != 2) {
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syntax(fspec, "bad # arguments");
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goto failure;
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}
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setMaterial(sc, argv[1]);
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break;
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case 'o': /* object name */
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case 'g': /* group name */
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if (argc < 2) {
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syntax(fspec, "missing argument");
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goto failure;
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}
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setGroup(sc, group_name(argc-1, argv+1));
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break;
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case '#': /* comment */
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continue;
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default:; /* something we don't deal with */
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unknown:
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nunknown++;
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break;
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}
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nstats++;
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if (verbose && !(nstats & 0x3fff))
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fprintf(stderr, " %8d statements\r", nstats);
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}
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#if POPEN_SUPPORT
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if (fspec[0] == '!' && pclose(fp) != 0) {
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sprintf(errmsg, "Bad return status from: %s", fspec+1);
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error(USER, errmsg);
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freeScene(sc);
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return(NULL);
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} else
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#endif
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if (fp != stdin)
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fclose(fp);
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sprintf(buf, "%d statements read from \"%s\"", nstats, fspec);
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addComment(sc, buf);
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if (nunknown) {
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sprintf(buf, "\t%d unrecognized", nunknown);
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addComment(sc, buf);
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}
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sprintf(buf, "%d faces", sc->nfaces - onfaces);
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addComment(sc, buf);
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sprintf(buf, "\t%d vertices, %d texture coordinates, %d surface normals",
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sc->nverts - ondx[0],
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sc->ntex - ondx[1],
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sc->nnorms - ondx[2]);
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addComment(sc, buf);
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return(sc);
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failure:
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#if POPEN_SUPPORT
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if (fspec[0] == '!')
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pclose(fp);
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else
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#endif
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if (fp != stdin)
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fclose(fp);
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freeScene(sc);
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return(NULL);
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}
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