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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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|
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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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typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
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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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/* 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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|
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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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|
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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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|
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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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|
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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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/* 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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|
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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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|
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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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|
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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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|
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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; |
| 256 |
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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} |
| 275 |
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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} |
| 309 |
if (!add_normal(sc, atof(argv[1]), |
| 310 |
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; |
| 320 |
case 'f': /* face */ |
| 321 |
if (argv[0][1]) |
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goto unknown; |
| 323 |
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; |
| 331 |
if (strcmp(argv[0], "usemtl")) |
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goto unknown; |
| 333 |
if (argc != 2) { |
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syntax(fspec, "bad # arguments"); |
| 335 |
goto failure; |
| 336 |
} |
| 337 |
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 */ |
| 341 |
if (argc < 2) { |
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syntax(fspec, "missing argument"); |
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goto failure; |
| 344 |
} |
| 345 |
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; |
| 353 |
} |
| 354 |
nstats++; |
| 355 |
if (verbose && !(nstats & 0x3fff)) |
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fprintf(stderr, " %8d statements\r", nstats); |
| 357 |
} |
| 358 |
#if POPEN_SUPPORT |
| 359 |
if (fspec[0] == '!') |
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pclose(fp); |
| 361 |
else |
| 362 |
#endif |
| 363 |
if (fp != stdin) |
| 364 |
fclose(fp); |
| 365 |
sprintf(buf, "%d statements read from \"%s\"", nstats, fspec); |
| 366 |
addComment(sc, buf); |
| 367 |
if (nunknown) { |
| 368 |
sprintf(buf, "\t%d unrecognized", nunknown); |
| 369 |
addComment(sc, buf); |
| 370 |
} |
| 371 |
sprintf(buf, "%d faces", sc->nfaces - onfaces); |
| 372 |
addComment(sc, buf); |
| 373 |
sprintf(buf, "\t%d vertices, %d texture coordinates, %d surface normals", |
| 374 |
sc->nverts - ondx[0], |
| 375 |
sc->ntex - ondx[1], |
| 376 |
sc->nnorms - ondx[2]); |
| 377 |
addComment(sc, buf); |
| 378 |
return(sc); |
| 379 |
failure: |
| 380 |
#if POPEN_SUPPORT |
| 381 |
if (fspec[0] == '!') |
| 382 |
pclose(fp); |
| 383 |
else |
| 384 |
#endif |
| 385 |
if (fp != stdin) |
| 386 |
fclose(fp); |
| 387 |
freeScene(sc); |
| 388 |
return(NULL); |
| 389 |
} |
