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#ifndef lint |
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static const char RCSid[] = "$Id: readwfobj.c,v 2.3 2020/05/01 18:55:34 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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|
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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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|
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#define MAXARG 512 /* maximum # arguments in a statement */ |
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|
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static int lineno; /* current line number */ |
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|
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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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|
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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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|
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return(i); |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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] == '!') |
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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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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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} |
