| 1 |
greg |
2.1 |
#ifndef lint |
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static const char RCSid[] = "$Id$"; |
| 3 |
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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 <stdlib.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) */ |
| 20 |
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| 21 |
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#define MAXARG 512 /* maximum # arguments in a statement */ |
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| 23 |
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static int lineno; /* current line number */ |
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| 25 |
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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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{ |
| 29 |
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static char sbuf[MAXARG*16]; |
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register char *cp; |
| 31 |
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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; |
| 37 |
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for ( ; ; ) { |
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while (isspace(*cp) || *cp == '\\') { |
| 39 |
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if (*cp == '\n') |
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lineno++; |
| 41 |
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*cp++ = '\0'; |
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} |
| 43 |
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if (!*cp) |
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break; |
| 45 |
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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; |
| 53 |
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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++; |
| 58 |
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} while (!i); |
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| 60 |
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return(i); |
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} |
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| 63 |
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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; |
| 74 |
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if (vi[0] < 0) |
| 75 |
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return(0); |
| 76 |
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} else |
| 77 |
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return(0); |
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/* get map coord. */ |
| 79 |
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while (*vs) |
| 80 |
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if (*vs++ == '/') |
| 81 |
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break; |
| 82 |
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vi[1] = atoi(vs); |
| 83 |
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if (vi[1] > 0) { |
| 84 |
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if ((vi[1] += ondx[1] - 1) >= sc->ntex) |
| 85 |
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return(0); |
| 86 |
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} else if (vi[1] < 0) { |
| 87 |
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vi[1] += sc->ntex; |
| 88 |
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if (vi[1] < 0) |
| 89 |
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return(0); |
| 90 |
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} else |
| 91 |
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vi[1] = -1; |
| 92 |
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/* get normal */ |
| 93 |
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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); |
| 97 |
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if (vi[2] > 0) { |
| 98 |
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if ((vi[2] += ondx[2] - 1) >= sc->nnorms) |
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return(0); |
| 100 |
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} else if (vi[2] < 0) { |
| 101 |
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vi[2] += sc->nnorms; |
| 102 |
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if (vi[2] < 0) |
| 103 |
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return(0); |
| 104 |
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} else |
| 105 |
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vi[2] = -1; |
| 106 |
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return(1); |
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} |
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| 109 |
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/* report syntax error */ |
| 110 |
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static void |
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syntax(const char *fn, const char *er) |
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{ |
| 113 |
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sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s", |
| 114 |
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fn, lineno, er); |
| 115 |
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error(USER, errmsg); |
| 116 |
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} |
| 117 |
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| 118 |
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/* Add a vertex to our scene */ |
| 119 |
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static void |
| 120 |
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add_vertex(Scene *sc, double x, double y, double z) |
| 121 |
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{ |
| 122 |
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sc->vert = chunk_alloc(Vertex, sc->vert, sc->nverts); |
| 123 |
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sc->vert[sc->nverts].p[0] = x; |
| 124 |
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sc->vert[sc->nverts].p[1] = y; |
| 125 |
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sc->vert[sc->nverts].p[2] = z; |
| 126 |
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sc->vert[sc->nverts++].vflist = NULL; |
| 127 |
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} |
| 128 |
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| 129 |
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/* Add a texture coordinate to our scene */ |
| 130 |
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static void |
| 131 |
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add_texture(Scene *sc, double u, double v) |
| 132 |
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{ |
| 133 |
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sc->tex = chunk_alloc(TexCoord, sc->tex, sc->ntex); |
| 134 |
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sc->tex[sc->ntex].u = u; |
| 135 |
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sc->tex[sc->ntex].v = v; |
| 136 |
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sc->ntex++; |
| 137 |
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} |
| 138 |
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| 139 |
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/* Add a surface normal to our scene */ |
| 140 |
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static int |
| 141 |
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add_normal(Scene *sc, double xn, double yn, double zn) |
| 142 |
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{ |
| 143 |
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FVECT nrm; |
| 144 |
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| 145 |
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nrm[0] = xn; nrm[1] = yn; nrm[2] = zn; |
| 146 |
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if (normalize(nrm) == .0) |
| 147 |
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return(0); |
| 148 |
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sc->norm = chunk_alloc(Normal, sc->norm, sc->nnorms); |
| 149 |
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VCOPY(sc->norm[sc->nnorms], nrm); |
| 150 |
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sc->nnorms++; |
| 151 |
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return(1); |
| 152 |
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} |
| 153 |
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| 154 |
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/* combine multi-group name into single identifier w/o spaces */ |
| 155 |
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static char * |
| 156 |
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group_name(int ac, char **av) |
| 157 |
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{ |
| 158 |
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static char nambuf[256]; |
| 159 |
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char *cp; |
| 160 |
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if (ac < 1) |
| 161 |
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return("NO_NAME"); |
| 162 |
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if (ac == 1) |
| 163 |
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return(av[0]); |
| 164 |
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for (cp = nambuf; ac--; av++) { |
| 165 |
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strcpy(cp, *av); |
| 166 |
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while (*cp) { |
| 167 |
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/* XXX white space disallowed by current get_stmt() |
| 168 |
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if (isspace(*cp)) |
| 169 |
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*cp = '_'; |
| 170 |
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else |
| 171 |
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*/ |
| 172 |
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if (*cp == '.') |
| 173 |
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*cp = '_'; |
| 174 |
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++cp; |
| 175 |
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} |
| 176 |
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*cp++ = '.'; |
| 177 |
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} |
| 178 |
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*--cp = '\0'; |
| 179 |
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return(nambuf); |
| 180 |
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} |
| 181 |
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| 182 |
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/* set current group */ |
| 183 |
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static void |
| 184 |
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set_group(Scene *sc, const char *nm) |
| 185 |
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{ |
| 186 |
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sc->lastgrp = findName(nm, (const char **)sc->grpname, sc->ngrps); |
| 187 |
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if (sc->lastgrp >= 0) |
| 188 |
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return; |
| 189 |
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sc->grpname = chunk_alloc(char *, sc->grpname, sc->ngrps); |
| 190 |
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sc->grpname[sc->lastgrp=sc->ngrps++] = savqstr((char *)nm); |
| 191 |
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} |
| 192 |
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| 193 |
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/* set current material */ |
| 194 |
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static void |
| 195 |
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set_material(Scene *sc, const char *nm) |
| 196 |
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{ |
| 197 |
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sc->lastmat = findName(nm, (const char **)sc->matname, sc->nmats); |
| 198 |
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if (sc->lastmat >= 0) |
| 199 |
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return; |
| 200 |
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sc->matname = chunk_alloc(char *, sc->matname, sc->nmats); |
| 201 |
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sc->matname[sc->lastmat=sc->nmats++] = savqstr((char *)nm); |
| 202 |
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} |
| 203 |
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| 204 |
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/* Add a new face to scene */ |
| 205 |
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static int |
| 206 |
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add_face(Scene *sc, const VNDX ondx, int ac, char *av[]) |
| 207 |
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{ |
| 208 |
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Face *f; |
| 209 |
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int i; |
| 210 |
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| 211 |
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if (ac < 3) |
| 212 |
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return(0); |
| 213 |
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f = (Face *)emalloc(sizeof(Face)+sizeof(VertEnt)*(ac-3)); |
| 214 |
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f->flags = 0; |
| 215 |
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f->nv = ac; |
| 216 |
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f->grp = sc->lastgrp; |
| 217 |
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f->mat = sc->lastmat; |
| 218 |
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for (i = 0; i < ac; i++) { /* add each vertex */ |
| 219 |
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VNDX vin; |
| 220 |
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int j; |
| 221 |
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if (!cvtndx(vin, sc, ondx, av[i])) { |
| 222 |
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efree((char *)f); |
| 223 |
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return(0); |
| 224 |
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} |
| 225 |
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f->v[i].vid = vin[0]; |
| 226 |
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f->v[i].tid = vin[1]; |
| 227 |
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f->v[i].nid = vin[2]; |
| 228 |
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f->v[i].fnext = NULL; |
| 229 |
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for (j = i; j-- > 0; ) |
| 230 |
|
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if (f->v[j].vid == vin[0]) |
| 231 |
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break; |
| 232 |
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if (j < 0) { /* first occurrence? */ |
| 233 |
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f->v[i].fnext = sc->vert[vin[0]].vflist; |
| 234 |
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sc->vert[vin[0]].vflist = f; |
| 235 |
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} else if (ac == 3) /* degenerate triangle? */ |
| 236 |
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f->flags |= FACE_DEGENERATE; |
| 237 |
|
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} |
| 238 |
|
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f->next = sc->flist; /* push onto face list */ |
| 239 |
|
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sc->flist = f; |
| 240 |
|
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sc->nfaces++; |
| 241 |
|
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/* check face area */ |
| 242 |
|
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if (!(f->flags & FACE_DEGENERATE) && faceArea(sc, f, NULL) <= FTINY) |
| 243 |
|
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f->flags |= FACE_DEGENERATE; |
| 244 |
|
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return(1); |
| 245 |
|
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} |
| 246 |
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|
| 247 |
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/* Load a .OBJ file */ |
| 248 |
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Scene * |
| 249 |
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loadOBJ(Scene *sc, const char *fspec) |
| 250 |
|
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{ |
| 251 |
|
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FILE *fp; |
| 252 |
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char *argv[MAXARG]; |
| 253 |
|
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int argc; |
| 254 |
|
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char buf[256]; |
| 255 |
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int nstats=0, nunknown=0; |
| 256 |
|
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int onfaces; |
| 257 |
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VNDX ondx; |
| 258 |
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|
| 259 |
|
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if (fspec == NULL) { |
| 260 |
|
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fp = stdin; |
| 261 |
|
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fspec = "<stdin>"; |
| 262 |
|
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#if POPEN_SUPPORT |
| 263 |
|
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} else if (fspec[0] == '!') { |
| 264 |
|
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if ((fp = popen(fspec+1, "r")) == NULL) { |
| 265 |
|
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sprintf(errmsg, "%s: cannot execute", fspec); |
| 266 |
|
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error(SYSTEM, errmsg); |
| 267 |
|
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return(NULL); |
| 268 |
|
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} |
| 269 |
|
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#endif |
| 270 |
|
|
} else if ((fp = fopen(fspec, "r")) == NULL) { |
| 271 |
|
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sprintf(errmsg, "%s: cannot open for reading", fspec); |
| 272 |
|
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error(SYSTEM, errmsg); |
| 273 |
|
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return(NULL); |
| 274 |
|
|
} |
| 275 |
|
|
if (sc == NULL) |
| 276 |
|
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sc = newScene(); |
| 277 |
|
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lineno = 0; |
| 278 |
|
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onfaces = sc->nfaces; |
| 279 |
|
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ondx[0] = sc->nverts; |
| 280 |
|
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ondx[1] = sc->ntex; |
| 281 |
|
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ondx[2] = sc->nnorms; |
| 282 |
|
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while ((argc = get_stmt(argv, fp)) > 0) { |
| 283 |
|
|
switch (argv[0][0]) { |
| 284 |
|
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case 'v': /* vertex */ |
| 285 |
|
|
switch (argv[0][1]) { |
| 286 |
|
|
case '\0': /* point */ |
| 287 |
|
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if (badarg(argc-1,argv+1,"fff")) { |
| 288 |
|
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syntax(fspec, "bad vertex"); |
| 289 |
|
|
goto failure; |
| 290 |
|
|
} |
| 291 |
|
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add_vertex(sc, atof(argv[1]), |
| 292 |
|
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atof(argv[2]), |
| 293 |
|
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atof(argv[3])); |
| 294 |
|
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break; |
| 295 |
|
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case 't': /* texture coord. */ |
| 296 |
|
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if (argv[0][2]) |
| 297 |
|
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goto unknown; |
| 298 |
|
|
if (badarg(argc-1,argv+1,"ff")) |
| 299 |
|
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goto unknown; |
| 300 |
|
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add_texture(sc, atof(argv[1]), atof(argv[2])); |
| 301 |
|
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break; |
| 302 |
|
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case 'n': /* normal */ |
| 303 |
|
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if (argv[0][2]) |
| 304 |
|
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goto unknown; |
| 305 |
|
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if (badarg(argc-1,argv+1,"fff")) { |
| 306 |
|
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syntax(fspec, "bad normal"); |
| 307 |
|
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goto failure; |
| 308 |
|
|
} |
| 309 |
|
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if (!add_normal(sc, atof(argv[1]), |
| 310 |
|
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atof(argv[2]), |
| 311 |
|
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atof(argv[3]))) { |
| 312 |
|
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syntax(fspec, "zero normal"); |
| 313 |
|
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goto failure; |
| 314 |
|
|
} |
| 315 |
|
|
break; |
| 316 |
|
|
default: |
| 317 |
|
|
goto unknown; |
| 318 |
|
|
} |
| 319 |
|
|
break; |
| 320 |
|
|
case 'f': /* face */ |
| 321 |
|
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if (argv[0][1]) |
| 322 |
|
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goto unknown; |
| 323 |
|
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if (!add_face(sc, ondx, argc-1, argv+1)) { |
| 324 |
|
|
syntax(fspec, "bad face"); |
| 325 |
|
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goto failure; |
| 326 |
|
|
} |
| 327 |
|
|
break; |
| 328 |
|
|
case 'u': /* usemtl/usemap */ |
| 329 |
|
|
if (!strcmp(argv[0], "usemap")) |
| 330 |
|
|
break; |
| 331 |
|
|
if (strcmp(argv[0], "usemtl")) |
| 332 |
|
|
goto unknown; |
| 333 |
|
|
if (argc != 2) { |
| 334 |
|
|
syntax(fspec, "bad # arguments"); |
| 335 |
|
|
goto failure; |
| 336 |
|
|
} |
| 337 |
|
|
set_material(sc, argv[1]); |
| 338 |
|
|
break; |
| 339 |
|
|
case 'o': /* object name */ |
| 340 |
|
|
case 'g': /* group name */ |
| 341 |
|
|
if (argc < 2) { |
| 342 |
|
|
syntax(fspec, "missing argument"); |
| 343 |
|
|
goto failure; |
| 344 |
|
|
} |
| 345 |
|
|
set_group(sc, group_name(argc-1, argv+1)); |
| 346 |
|
|
break; |
| 347 |
|
|
case '#': /* comment */ |
| 348 |
|
|
continue; |
| 349 |
|
|
default:; /* something we don't deal with */ |
| 350 |
|
|
unknown: |
| 351 |
|
|
nunknown++; |
| 352 |
|
|
break; |
| 353 |
|
|
} |
| 354 |
|
|
nstats++; |
| 355 |
|
|
if (verbose && !(nstats & 0x3fff)) |
| 356 |
|
|
fprintf(stderr, " %8d statements\r", nstats); |
| 357 |
|
|
} |
| 358 |
|
|
#if POPEN_SUPPORT |
| 359 |
|
|
if (fspec[0] == '!') |
| 360 |
|
|
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 |
|
|
} |
