| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: readwfobj.c,v 2.2 2020/04/23 03:19:48 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* readobj.c |
| 6 |
* |
| 7 |
* Routines for reading a Wavefront .OBJ file |
| 8 |
* |
| 9 |
* Created by Greg Ward on Wed Feb 11 2004. |
| 10 |
*/ |
| 11 |
|
| 12 |
#include "rtio.h" |
| 13 |
#include "rterror.h" |
| 14 |
#include "fvect.h" |
| 15 |
#include "paths.h" |
| 16 |
#include <ctype.h> |
| 17 |
#include "objutil.h" |
| 18 |
|
| 19 |
typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
| 20 |
|
| 21 |
#define MAXARG 512 /* maximum # arguments in a statement */ |
| 22 |
|
| 23 |
static int lineno; /* current line number */ |
| 24 |
|
| 25 |
/* read the next statement from fp */ |
| 26 |
static int |
| 27 |
get_stmt(char *av[MAXARG], FILE *fp) |
| 28 |
{ |
| 29 |
static char sbuf[MAXARG*16]; |
| 30 |
register char *cp; |
| 31 |
register int i; |
| 32 |
|
| 33 |
do { |
| 34 |
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
| 35 |
return(0); |
| 36 |
i = 0; |
| 37 |
for ( ; ; ) { |
| 38 |
while (isspace(*cp) || *cp == '\\') { |
| 39 |
if (*cp == '\n') |
| 40 |
lineno++; |
| 41 |
*cp++ = '\0'; |
| 42 |
} |
| 43 |
if (!*cp) |
| 44 |
break; |
| 45 |
if (i >= MAXARG-1) { |
| 46 |
sprintf(errmsg, |
| 47 |
"Too many arguments near line %d (limit %d)", |
| 48 |
lineno+1, MAXARG-1); |
| 49 |
error(WARNING, errmsg); |
| 50 |
break; |
| 51 |
} |
| 52 |
av[i++] = cp; |
| 53 |
while (*++cp && !isspace(*cp)) |
| 54 |
; |
| 55 |
} |
| 56 |
av[i] = NULL; |
| 57 |
lineno++; |
| 58 |
} while (!i); |
| 59 |
|
| 60 |
return(i); |
| 61 |
} |
| 62 |
|
| 63 |
/* convert vertex string to index */ |
| 64 |
static int |
| 65 |
cvtndx(VNDX vi, const Scene *sc, const VNDX ondx, const char *vs) |
| 66 |
{ |
| 67 |
/* get point */ |
| 68 |
vi[0] = atoi(vs); |
| 69 |
if (vi[0] > 0) { |
| 70 |
if ((vi[0] += ondx[0] - 1) >= sc->nverts) |
| 71 |
return(0); |
| 72 |
} else if (vi[0] < 0) { |
| 73 |
vi[0] += sc->nverts; |
| 74 |
if (vi[0] < 0) |
| 75 |
return(0); |
| 76 |
} else |
| 77 |
return(0); |
| 78 |
/* get map coord. */ |
| 79 |
while (*vs) |
| 80 |
if (*vs++ == '/') |
| 81 |
break; |
| 82 |
vi[1] = atoi(vs); |
| 83 |
if (vi[1] > 0) { |
| 84 |
if ((vi[1] += ondx[1] - 1) >= sc->ntex) |
| 85 |
return(0); |
| 86 |
} else if (vi[1] < 0) { |
| 87 |
vi[1] += sc->ntex; |
| 88 |
if (vi[1] < 0) |
| 89 |
return(0); |
| 90 |
} else |
| 91 |
vi[1] = -1; |
| 92 |
/* get normal */ |
| 93 |
while (*vs) |
| 94 |
if (*vs++ == '/') |
| 95 |
break; |
| 96 |
vi[2] = atoi(vs); |
| 97 |
if (vi[2] > 0) { |
| 98 |
if ((vi[2] += ondx[2] - 1) >= sc->nnorms) |
| 99 |
return(0); |
| 100 |
} else if (vi[2] < 0) { |
| 101 |
vi[2] += sc->nnorms; |
| 102 |
if (vi[2] < 0) |
| 103 |
return(0); |
| 104 |
} else |
| 105 |
vi[2] = -1; |
| 106 |
return(1); |
| 107 |
} |
| 108 |
|
| 109 |
/* report syntax error */ |
| 110 |
static void |
| 111 |
syntax(const char *fn, const char *er) |
| 112 |
{ |
| 113 |
sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s", |
| 114 |
fn, lineno, er); |
| 115 |
error(USER, errmsg); |
| 116 |
} |
| 117 |
|
| 118 |
/* combine multi-group name into single identifier w/o spaces */ |
| 119 |
static char * |
| 120 |
group_name(int ac, char **av) |
| 121 |
{ |
| 122 |
static char nambuf[256]; |
| 123 |
char *cp; |
| 124 |
if (ac < 1) |
| 125 |
return("NO_NAME"); |
| 126 |
if (ac == 1) |
| 127 |
return(av[0]); |
| 128 |
for (cp = nambuf; ac--; av++) { |
| 129 |
strcpy(cp, *av); |
| 130 |
while (*cp) { |
| 131 |
/* XXX white space disallowed by current get_stmt() |
| 132 |
if (isspace(*cp)) |
| 133 |
*cp = '_'; |
| 134 |
else |
| 135 |
*/ |
| 136 |
if (*cp == '.') |
| 137 |
*cp = '_'; |
| 138 |
++cp; |
| 139 |
} |
| 140 |
*cp++ = '.'; |
| 141 |
} |
| 142 |
*--cp = '\0'; |
| 143 |
return(nambuf); |
| 144 |
} |
| 145 |
|
| 146 |
/* Add a new face to scene */ |
| 147 |
static int |
| 148 |
add_face(Scene *sc, const VNDX ondx, int ac, char *av[]) |
| 149 |
{ |
| 150 |
Face *f; |
| 151 |
int i; |
| 152 |
|
| 153 |
if (ac < 3) |
| 154 |
return(0); |
| 155 |
f = (Face *)emalloc(sizeof(Face)+sizeof(VertEnt)*(ac-3)); |
| 156 |
f->flags = 0; |
| 157 |
f->nv = ac; |
| 158 |
f->grp = sc->lastgrp; |
| 159 |
f->mat = sc->lastmat; |
| 160 |
for (i = 0; i < ac; i++) { /* add each vertex */ |
| 161 |
VNDX vin; |
| 162 |
int j; |
| 163 |
if (!cvtndx(vin, sc, ondx, av[i])) { |
| 164 |
efree((char *)f); |
| 165 |
return(0); |
| 166 |
} |
| 167 |
f->v[i].vid = vin[0]; |
| 168 |
f->v[i].tid = vin[1]; |
| 169 |
f->v[i].nid = vin[2]; |
| 170 |
f->v[i].fnext = NULL; |
| 171 |
for (j = i; j-- > 0; ) |
| 172 |
if (f->v[j].vid == vin[0]) |
| 173 |
break; |
| 174 |
if (j < 0) { /* first occurrence? */ |
| 175 |
f->v[i].fnext = sc->vert[vin[0]].vflist; |
| 176 |
sc->vert[vin[0]].vflist = f; |
| 177 |
} else if (ac == 3) /* degenerate triangle? */ |
| 178 |
f->flags |= FACE_DEGENERATE; |
| 179 |
} |
| 180 |
f->next = sc->flist; /* push onto face list */ |
| 181 |
sc->flist = f; |
| 182 |
sc->nfaces++; |
| 183 |
/* check face area */ |
| 184 |
if (!(f->flags & FACE_DEGENERATE) && faceArea(sc, f, NULL) <= FTINY) |
| 185 |
f->flags |= FACE_DEGENERATE; |
| 186 |
return(1); |
| 187 |
} |
| 188 |
|
| 189 |
/* Load a .OBJ file */ |
| 190 |
Scene * |
| 191 |
loadOBJ(Scene *sc, const char *fspec) |
| 192 |
{ |
| 193 |
FILE *fp; |
| 194 |
char *argv[MAXARG]; |
| 195 |
int argc; |
| 196 |
char buf[256]; |
| 197 |
int nstats=0, nunknown=0; |
| 198 |
int onfaces; |
| 199 |
VNDX ondx; |
| 200 |
|
| 201 |
if (fspec == NULL) { |
| 202 |
fp = stdin; |
| 203 |
fspec = "<stdin>"; |
| 204 |
#if POPEN_SUPPORT |
| 205 |
} else if (fspec[0] == '!') { |
| 206 |
if ((fp = popen(fspec+1, "r")) == NULL) { |
| 207 |
sprintf(errmsg, "%s: cannot execute", fspec); |
| 208 |
error(SYSTEM, errmsg); |
| 209 |
return(NULL); |
| 210 |
} |
| 211 |
#endif |
| 212 |
} else if ((fp = fopen(fspec, "r")) == NULL) { |
| 213 |
sprintf(errmsg, "%s: cannot open for reading", fspec); |
| 214 |
error(SYSTEM, errmsg); |
| 215 |
return(NULL); |
| 216 |
} |
| 217 |
if (sc == NULL) |
| 218 |
sc = newScene(); |
| 219 |
lineno = 0; |
| 220 |
onfaces = sc->nfaces; |
| 221 |
ondx[0] = sc->nverts; |
| 222 |
ondx[1] = sc->ntex; |
| 223 |
ondx[2] = sc->nnorms; |
| 224 |
while ((argc = get_stmt(argv, fp)) > 0) { |
| 225 |
switch (argv[0][0]) { |
| 226 |
case 'v': /* vertex */ |
| 227 |
switch (argv[0][1]) { |
| 228 |
case '\0': /* point */ |
| 229 |
if (badarg(argc-1,argv+1,"fff")) { |
| 230 |
syntax(fspec, "bad vertex"); |
| 231 |
goto failure; |
| 232 |
} |
| 233 |
addVertex(sc, atof(argv[1]), |
| 234 |
atof(argv[2]), |
| 235 |
atof(argv[3])); |
| 236 |
break; |
| 237 |
case 't': /* texture coord. */ |
| 238 |
if (argv[0][2]) |
| 239 |
goto unknown; |
| 240 |
if (badarg(argc-1,argv+1,"ff")) |
| 241 |
goto unknown; |
| 242 |
addTexture(sc, atof(argv[1]), atof(argv[2])); |
| 243 |
break; |
| 244 |
case 'n': /* normal */ |
| 245 |
if (argv[0][2]) |
| 246 |
goto unknown; |
| 247 |
if (badarg(argc-1,argv+1,"fff")) { |
| 248 |
syntax(fspec, "bad normal"); |
| 249 |
goto failure; |
| 250 |
} |
| 251 |
if (addNormal(sc, atof(argv[1]), |
| 252 |
atof(argv[2]), |
| 253 |
atof(argv[3])) < 0) { |
| 254 |
syntax(fspec, "zero normal"); |
| 255 |
goto failure; |
| 256 |
} |
| 257 |
break; |
| 258 |
default: |
| 259 |
goto unknown; |
| 260 |
} |
| 261 |
break; |
| 262 |
case 'f': /* face */ |
| 263 |
if (argv[0][1]) |
| 264 |
goto unknown; |
| 265 |
if (!add_face(sc, ondx, argc-1, argv+1)) { |
| 266 |
syntax(fspec, "bad face"); |
| 267 |
goto failure; |
| 268 |
} |
| 269 |
break; |
| 270 |
case 'u': /* usemtl/usemap */ |
| 271 |
if (!strcmp(argv[0], "usemap")) |
| 272 |
break; |
| 273 |
if (strcmp(argv[0], "usemtl")) |
| 274 |
goto unknown; |
| 275 |
if (argc != 2) { |
| 276 |
syntax(fspec, "bad # arguments"); |
| 277 |
goto failure; |
| 278 |
} |
| 279 |
setMaterial(sc, argv[1]); |
| 280 |
break; |
| 281 |
case 'o': /* object name */ |
| 282 |
case 'g': /* group name */ |
| 283 |
if (argc < 2) { |
| 284 |
syntax(fspec, "missing argument"); |
| 285 |
goto failure; |
| 286 |
} |
| 287 |
setGroup(sc, group_name(argc-1, argv+1)); |
| 288 |
break; |
| 289 |
case '#': /* comment */ |
| 290 |
continue; |
| 291 |
default:; /* something we don't deal with */ |
| 292 |
unknown: |
| 293 |
nunknown++; |
| 294 |
break; |
| 295 |
} |
| 296 |
nstats++; |
| 297 |
if (verbose && !(nstats & 0x3fff)) |
| 298 |
fprintf(stderr, " %8d statements\r", nstats); |
| 299 |
} |
| 300 |
#if POPEN_SUPPORT |
| 301 |
if (fspec[0] == '!') |
| 302 |
pclose(fp); |
| 303 |
else |
| 304 |
#endif |
| 305 |
if (fp != stdin) |
| 306 |
fclose(fp); |
| 307 |
sprintf(buf, "%d statements read from \"%s\"", nstats, fspec); |
| 308 |
addComment(sc, buf); |
| 309 |
if (nunknown) { |
| 310 |
sprintf(buf, "\t%d unrecognized", nunknown); |
| 311 |
addComment(sc, buf); |
| 312 |
} |
| 313 |
sprintf(buf, "%d faces", sc->nfaces - onfaces); |
| 314 |
addComment(sc, buf); |
| 315 |
sprintf(buf, "\t%d vertices, %d texture coordinates, %d surface normals", |
| 316 |
sc->nverts - ondx[0], |
| 317 |
sc->ntex - ondx[1], |
| 318 |
sc->nnorms - ondx[2]); |
| 319 |
addComment(sc, buf); |
| 320 |
return(sc); |
| 321 |
failure: |
| 322 |
#if POPEN_SUPPORT |
| 323 |
if (fspec[0] == '!') |
| 324 |
pclose(fp); |
| 325 |
else |
| 326 |
#endif |
| 327 |
if (fp != stdin) |
| 328 |
fclose(fp); |
| 329 |
freeScene(sc); |
| 330 |
return(NULL); |
| 331 |
} |
