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#ifndef lint
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static const char RCSid[] = "$Id: readwfobj.c,v 2.1 2020/03/30 18:28:35 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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typedef int VNDX[3]; /* vertex index (point,map,normal) */
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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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/* Add a vertex to our scene */
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static void
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add_vertex(Scene *sc, double x, double y, double z)
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{
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sc->vert = chunk_alloc(Vertex, sc->vert, sc->nverts);
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sc->vert[sc->nverts].p[0] = x;
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sc->vert[sc->nverts].p[1] = y;
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sc->vert[sc->nverts].p[2] = z;
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sc->vert[sc->nverts++].vflist = NULL;
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}
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/* Add a texture coordinate to our scene */
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static void
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add_texture(Scene *sc, double u, double v)
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{
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sc->tex = chunk_alloc(TexCoord, sc->tex, sc->ntex);
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sc->tex[sc->ntex].u = u;
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sc->tex[sc->ntex].v = v;
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sc->ntex++;
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}
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/* Add a surface normal to our scene */
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static int
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add_normal(Scene *sc, double xn, double yn, double zn)
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{
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FVECT nrm;
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nrm[0] = xn; nrm[1] = yn; nrm[2] = zn;
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if (normalize(nrm) == .0)
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return(0);
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sc->norm = chunk_alloc(Normal, sc->norm, sc->nnorms);
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VCOPY(sc->norm[sc->nnorms], nrm);
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sc->nnorms++;
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return(1);
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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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/* set current group */
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static void
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set_group(Scene *sc, const char *nm)
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{
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sc->lastgrp = findName(nm, (const char **)sc->grpname, sc->ngrps);
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if (sc->lastgrp >= 0)
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return;
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sc->grpname = chunk_alloc(char *, sc->grpname, sc->ngrps);
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sc->grpname[sc->lastgrp=sc->ngrps++] = savqstr((char *)nm);
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}
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/* set current material */
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static void
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set_material(Scene *sc, const char *nm)
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{
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sc->lastmat = findName(nm, (const char **)sc->matname, sc->nmats);
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if (sc->lastmat >= 0)
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return;
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sc->matname = chunk_alloc(char *, sc->matname, sc->nmats);
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sc->matname[sc->lastmat=sc->nmats++] = savqstr((char *)nm);
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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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Face *f;
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int i;
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if (ac < 3)
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return(0);
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f = (Face *)emalloc(sizeof(Face)+sizeof(VertEnt)*(ac-3));
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f->flags = 0;
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f->nv = ac;
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f->grp = sc->lastgrp;
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f->mat = sc->lastmat;
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for (i = 0; i < ac; i++) { /* add each vertex */
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VNDX vin;
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int j;
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if (!cvtndx(vin, sc, ondx, av[i])) {
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efree((char *)f);
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return(0);
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}
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f->v[i].vid = vin[0];
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f->v[i].tid = vin[1];
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f->v[i].nid = vin[2];
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f->v[i].fnext = NULL;
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for (j = i; j-- > 0; )
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if (f->v[j].vid == vin[0])
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break;
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if (j < 0) { /* first occurrence? */
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f->v[i].fnext = sc->vert[vin[0]].vflist;
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sc->vert[vin[0]].vflist = f;
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} else if (ac == 3) /* degenerate triangle? */
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f->flags |= FACE_DEGENERATE;
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}
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f->next = sc->flist; /* push onto face list */
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sc->flist = f;
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sc->nfaces++;
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/* check face area */
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if (!(f->flags & FACE_DEGENERATE) && faceArea(sc, f, NULL) <= FTINY)
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f->flags |= FACE_DEGENERATE;
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return(1);
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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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add_vertex(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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add_texture(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 (!add_normal(sc, atof(argv[1]),
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atof(argv[2]),
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atof(argv[3]))) {
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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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set_material(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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set_group(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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| 358 |
#if POPEN_SUPPORT
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| 359 |
if (fspec[0] == '!')
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pclose(fp);
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else
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| 362 |
#endif
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| 363 |
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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| 367 |
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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| 371 |
sprintf(buf, "%d faces", sc->nfaces - onfaces);
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addComment(sc, buf);
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| 373 |
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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| 377 |
addComment(sc, buf);
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| 378 |
return(sc);
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| 379 |
failure:
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| 380 |
#if POPEN_SUPPORT
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| 381 |
if (fspec[0] == '!')
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| 382 |
pclose(fp);
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| 383 |
else
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| 384 |
#endif
|
| 385 |
if (fp != stdin)
|
| 386 |
fclose(fp);
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| 387 |
freeScene(sc);
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| 388 |
return(NULL);
|
| 389 |
}
|
