eqemu

annotate src/objfile.cc @ 6:977bc1cb055b

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almost done
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 18 Jul 2014 02:35:06 +0300
parents 9b5bb05ae53a
children 2656099aff12
rev   line source
nuclear@3 1 #include <stdlib.h>
nuclear@3 2 #include <string.h>
nuclear@3 3 #include <ctype.h>
nuclear@3 4 #include <limits.h>
nuclear@4 5 #include <assert.h>
nuclear@3 6 #include <vector>
nuclear@3 7 #include <map>
nuclear@3 8 #include <string>
nuclear@3 9 #include <sstream>
nuclear@3 10 #include <iomanip>
nuclear@3 11 #include "scene.h"
nuclear@3 12
nuclear@3 13 using namespace std;
nuclear@3 14
nuclear@3 15 #define COMMANDS \
nuclear@3 16 CMD(V), \
nuclear@3 17 CMD(VN), \
nuclear@3 18 CMD(VT), \
nuclear@3 19 CMD(F), \
nuclear@3 20 CMD(O), \
nuclear@3 21 CMD(G), \
nuclear@3 22 CMD(MTLLIB), \
nuclear@3 23 CMD(USEMTL), \
nuclear@3 24 CMD(NEWMTL), \
nuclear@6 25 CMD(KE), \
nuclear@3 26 CMD(KA), \
nuclear@3 27 CMD(KD), \
nuclear@3 28 CMD(KS), \
nuclear@3 29 CMD(NS), \
nuclear@3 30 CMD(NI), \
nuclear@3 31 CMD(D), \
nuclear@3 32 CMD(TR), \
nuclear@3 33 CMD(MAP_KD), \
nuclear@6 34 CMD(MAP_REFL), \
nuclear@6 35 CMD(MAP_BUMP), \
nuclear@3 36 CMD(MAP_KS), \
nuclear@3 37 CMD(MAP_NS), \
nuclear@3 38 CMD(MAP_D), \
nuclear@3 39 CMD(REFL), \
nuclear@3 40 CMD(BUMP)
nuclear@3 41
nuclear@3 42 #define CMD(x) CMD_##x
nuclear@3 43 enum {
nuclear@3 44 COMMANDS,
nuclear@3 45 CMD_UNK
nuclear@3 46 };
nuclear@3 47 #undef CMD
nuclear@3 48
nuclear@3 49 #define CMD(x) #x
nuclear@3 50 static const char *cmd_names[] = {
nuclear@3 51 COMMANDS,
nuclear@3 52 0
nuclear@3 53 };
nuclear@3 54 #undef CMD
nuclear@3 55
nuclear@3 56
nuclear@3 57 struct ObjFace {
nuclear@3 58 int elem;
nuclear@3 59 int v[4], n[4], t[4];
nuclear@3 60 };
nuclear@3 61
nuclear@3 62 struct ObjFile {
nuclear@3 63 string cur_obj, cur_mat;
nuclear@3 64 vector<Vector3> v, vn;
nuclear@3 65 vector<Vector2> vt;
nuclear@3 66 vector<ObjFace> f;
nuclear@3 67 };
nuclear@3 68
nuclear@3 69 typedef Vector3 Color;
nuclear@3 70
nuclear@3 71 struct ObjMat {
nuclear@3 72 string name; // newmtl <name>
nuclear@3 73 Color ambient, diffuse, specular; // Ka, Kd, Ks
nuclear@6 74 Color emissive; // Ke
nuclear@3 75 float shininess; // Ns
nuclear@3 76 float ior; // Ni
nuclear@3 77 float alpha; // d, Tr
nuclear@3 78
nuclear@3 79 string tex_dif, tex_spec, tex_shin, tex_alpha; // map_Kd, map_Ks, map_Ns, map_d
nuclear@3 80 string tex_refl; // refl -type sphere|cube file
nuclear@3 81 string tex_bump; // bump
nuclear@3 82
nuclear@3 83 ObjMat() { reset(); }
nuclear@3 84
nuclear@3 85 void reset() {
nuclear@3 86 ambient = diffuse = Color(0.5, 0.5, 0.5);
nuclear@3 87 specular = Color(0.0, 0.0, 0.0);
nuclear@3 88 name = tex_dif = tex_spec = tex_shin = tex_alpha = tex_refl = tex_bump = "";
nuclear@3 89 shininess = 0;
nuclear@3 90 ior = alpha = 1;
nuclear@3 91 }
nuclear@3 92 };
nuclear@3 93
nuclear@3 94 static bool read_materials(FILE *fp, vector<ObjMat> *vmtl);
nuclear@3 95 static Object *cons_object(ObjFile *obj);
nuclear@3 96
nuclear@3 97 static int get_cmd(char *str);
nuclear@3 98 static bool is_int(const char *str);
nuclear@3 99 static bool is_float(const char *str);
nuclear@3 100 static bool parse_vec(Vector3 *vec);
nuclear@3 101 static bool parse_color(Color *col);
nuclear@3 102 static bool parse_face(ObjFace *face);
nuclear@3 103 static const char *parse_map();
nuclear@3 104
nuclear@3 105
nuclear@3 106 static map<string, Material> matlib;
nuclear@3 107
nuclear@3 108
nuclear@3 109 #define INVALID_IDX INT_MIN
nuclear@3 110
nuclear@3 111 #define SEP " \t\n\r\v"
nuclear@3 112 #define BUF_SZ 512
nuclear@3 113 bool Scene::load_obj(FILE *fp)
nuclear@3 114 {
nuclear@3 115 static int seq;
nuclear@3 116 char cur_name[16];
nuclear@3 117 stringstream sstr;
nuclear@3 118
nuclear@3 119 ObjFile obj;
nuclear@3 120
nuclear@3 121 sprintf(cur_name, "default%02d.obj", seq++);
nuclear@3 122 obj.cur_obj = cur_name;
nuclear@3 123
nuclear@3 124 int prev_cmd = 0, obj_added = 0;
nuclear@3 125 for(;;) {
nuclear@3 126 Vector3 vec;
nuclear@3 127 ObjFace face;
nuclear@3 128
nuclear@3 129 char line[BUF_SZ];
nuclear@3 130 fgets(line, sizeof line, fp);
nuclear@3 131 if(feof(fp)) {
nuclear@3 132 break;
nuclear@3 133 }
nuclear@3 134
nuclear@3 135 char *tok;
nuclear@3 136 if(!(tok = strtok(line, SEP))) {
nuclear@3 137 continue; // ignore empty lines
nuclear@3 138 }
nuclear@3 139
nuclear@3 140 int cmd;
nuclear@3 141 if((cmd = get_cmd(tok)) == -1) {
nuclear@3 142 continue; // ignore unknown commands ...
nuclear@3 143 }
nuclear@3 144
nuclear@3 145 switch(cmd) {
nuclear@3 146 case CMD_V:
nuclear@3 147 if(!parse_vec(&vec)) {
nuclear@3 148 continue;
nuclear@3 149 }
nuclear@3 150 obj.v.push_back(vec);
nuclear@3 151 break;
nuclear@3 152
nuclear@3 153 case CMD_VN:
nuclear@3 154 if(!parse_vec(&vec)) {
nuclear@3 155 continue;
nuclear@3 156 }
nuclear@3 157 obj.vn.push_back(vec);
nuclear@3 158 break;
nuclear@3 159
nuclear@3 160 case CMD_VT:
nuclear@3 161 if(!parse_vec(&vec)) {
nuclear@3 162 continue;
nuclear@3 163 }
nuclear@3 164 vec.y = 1.0 - vec.y;
nuclear@3 165 obj.vt.push_back(Vector2(vec.x, vec.y));
nuclear@3 166 break;
nuclear@3 167
nuclear@3 168 case CMD_O:
nuclear@3 169 case CMD_G:
nuclear@3 170 if(prev_cmd == CMD_O || prev_cmd == CMD_G) {
nuclear@3 171 break; // just in case we've got both of them in a row
nuclear@3 172 }
nuclear@3 173 /* if we have any previous data, group them up, add the object
nuclear@3 174 * and continue with the new one...
nuclear@3 175 */
nuclear@3 176 if(!obj.f.empty()) {
nuclear@3 177 Object *robj = cons_object(&obj);
nuclear@3 178 robj->mtl = matlib[obj.cur_mat];
nuclear@3 179 add_object(robj);
nuclear@3 180 obj_added++;
nuclear@3 181
nuclear@3 182 obj.f.clear(); // clean the face list
nuclear@3 183 }
nuclear@3 184 if((tok = strtok(0, SEP))) {
nuclear@3 185 obj.cur_obj = tok;
nuclear@3 186 } else {
nuclear@3 187 sprintf(cur_name, "default%02d.obj", seq++);
nuclear@3 188 obj.cur_obj = cur_name;
nuclear@3 189 }
nuclear@3 190 break;
nuclear@3 191
nuclear@3 192 case CMD_MTLLIB:
nuclear@3 193 if((tok = strtok(0, SEP))) {
nuclear@3 194 FILE *mfile;
nuclear@3 195 if(!(mfile = fopen(tok, "rb"))) {
nuclear@3 196 fprintf(stderr, "failed to open material library: %s\n", tok);
nuclear@3 197 continue;
nuclear@3 198 }
nuclear@3 199
nuclear@3 200 // load all materials of the mtl file into a vector
nuclear@3 201 vector<ObjMat> vmtl;
nuclear@3 202 if(!read_materials(mfile, &vmtl)) {
nuclear@3 203 continue;
nuclear@3 204 }
nuclear@3 205 fclose(mfile);
nuclear@3 206
nuclear@3 207 // and add them all to the scene
nuclear@3 208 for(size_t i=0; i<vmtl.size(); i++) {
nuclear@3 209 Material mat;
nuclear@3 210 mat.ambient = vmtl[i].ambient;
nuclear@3 211 mat.diffuse = vmtl[i].diffuse;
nuclear@3 212 mat.specular = vmtl[i].specular;
nuclear@3 213 mat.shininess = vmtl[i].shininess;
nuclear@6 214 mat.emissive = vmtl[i].emissive;
nuclear@3 215 mat.alpha = vmtl[i].alpha;
nuclear@3 216
nuclear@5 217 if(vmtl[i].tex_dif.length()) {
nuclear@5 218 mat.tex[TEX_DIFFUSE] = load_texture(vmtl[i].tex_dif.c_str());
nuclear@5 219 }
nuclear@5 220 if(vmtl[i].tex_refl.length()) {
nuclear@5 221 mat.tex[TEX_ENVMAP] = load_texture(vmtl[i].tex_refl.c_str());
nuclear@5 222 }
nuclear@3 223
nuclear@3 224 matlib[vmtl[i].name] = mat;
nuclear@3 225 }
nuclear@3 226 }
nuclear@3 227 break;
nuclear@3 228
nuclear@3 229 case CMD_USEMTL:
nuclear@3 230 if((tok = strtok(0, SEP))) {
nuclear@3 231 obj.cur_mat = tok;
nuclear@3 232 } else {
nuclear@3 233 obj.cur_mat = "";
nuclear@3 234 }
nuclear@3 235 break;
nuclear@3 236
nuclear@3 237 case CMD_F:
nuclear@3 238 if(!parse_face(&face)) {
nuclear@3 239 continue;
nuclear@3 240 }
nuclear@3 241
nuclear@3 242 // convert negative indices to regular indices
nuclear@3 243 for(int i=0; i<4; i++) {
nuclear@3 244 if(face.v[i] < 0 && face.v[i] != INVALID_IDX) {
nuclear@3 245 face.v[i] = obj.v.size() + face.v[i];
nuclear@3 246 }
nuclear@3 247 if(face.n[i] < 0 && face.n[i] != INVALID_IDX) {
nuclear@3 248 face.n[i] = obj.vn.size() + face.n[i];
nuclear@3 249 }
nuclear@3 250 if(face.t[i] < 0 && face.t[i] != INVALID_IDX) {
nuclear@3 251 face.t[i] = obj.vt.size() + face.t[i];
nuclear@3 252 }
nuclear@3 253 }
nuclear@3 254
nuclear@3 255 // break quads into triangles if needed
nuclear@3 256 obj.f.push_back(face);
nuclear@3 257 if(face.elem == 4) {
nuclear@3 258 face.v[1] = face.v[2];
nuclear@3 259 face.n[1] = face.n[2];
nuclear@3 260 face.t[1] = face.t[2];
nuclear@3 261
nuclear@3 262 face.v[2] = face.v[3];
nuclear@3 263 face.n[2] = face.n[3];
nuclear@3 264 face.t[2] = face.t[3];
nuclear@3 265
nuclear@3 266 obj.f.push_back(face);
nuclear@3 267 }
nuclear@3 268 break;
nuclear@3 269
nuclear@3 270 default:
nuclear@3 271 break; // ignore unknown commands
nuclear@3 272 }
nuclear@3 273
nuclear@3 274 prev_cmd = cmd;
nuclear@3 275 }
nuclear@3 276
nuclear@3 277 // reached end of file...
nuclear@3 278 if(!obj.f.empty()) {
nuclear@3 279 Object *robj = cons_object(&obj);
nuclear@3 280 robj->mtl = matlib[obj.cur_mat];
nuclear@3 281 add_object(robj);
nuclear@3 282 obj_added++;
nuclear@3 283 }
nuclear@3 284
nuclear@3 285 return obj_added > 0;
nuclear@3 286 }
nuclear@3 287
nuclear@3 288 static Object *cons_object(ObjFile *obj)
nuclear@3 289 {
nuclear@3 290 Object *robj;
nuclear@3 291 Vector3 *varr, *narr;
nuclear@3 292 Vector2 *tarr;
nuclear@3 293
nuclear@3 294 int nelem = obj->f.size() * 3;
nuclear@3 295
nuclear@4 296 assert(sizeof(Vector3) == 3 * sizeof(float));
nuclear@4 297 assert(sizeof(Vector2) == 2 * sizeof(float));
nuclear@4 298
nuclear@3 299 try {
nuclear@3 300 robj = new Object;
nuclear@3 301 varr = new Vector3[nelem];
nuclear@3 302 narr = new Vector3[nelem];
nuclear@3 303 tarr = new Vector2[nelem];
nuclear@3 304 }
nuclear@3 305 catch(...) {
nuclear@3 306 return 0;
nuclear@3 307 }
nuclear@4 308 if(obj->cur_obj.length() > 0) {
nuclear@3 309 robj->set_name(obj->cur_obj.c_str());
nuclear@4 310 }
nuclear@3 311
nuclear@3 312 // need at least one of each element
nuclear@3 313 bool added_norm = false, added_tc = false;
nuclear@3 314 if(obj->vn.empty()) {
nuclear@3 315 obj->vn.push_back(Vector3(0, 0, 0));
nuclear@4 316 added_norm = true;
nuclear@3 317 }
nuclear@3 318 if(obj->vt.empty()) {
nuclear@3 319 obj->vt.push_back(Vector2(0, 0));
nuclear@3 320 added_tc = true;
nuclear@3 321 }
nuclear@3 322
nuclear@3 323 for(size_t i=0; i<obj->f.size(); i++) {
nuclear@3 324 for(int j=0; j<3; j++) {
nuclear@3 325 int idx = i * 3 + j;
nuclear@3 326 ObjFace *f = &obj->f[i];
nuclear@3 327
nuclear@3 328 varr[idx] = obj->v[f->v[j]];
nuclear@3 329 narr[idx] = obj->vn[f->n[j] < 0 ? 0 : f->n[j]];
nuclear@3 330
nuclear@3 331 float t = obj->vt[f->t[j] < 0 ? 0 : f->t[j]].x;
nuclear@3 332 float s = obj->vt[f->t[j] < 0 ? 0 : f->t[j]].y;
nuclear@3 333 tarr[idx] = Vector2(t, s);
nuclear@3 334 }
nuclear@3 335 }
nuclear@3 336
nuclear@3 337 if(added_norm) {
nuclear@3 338 obj->vn.pop_back();
nuclear@3 339 }
nuclear@3 340 if(added_tc) {
nuclear@3 341 obj->vt.pop_back();
nuclear@3 342 }
nuclear@3 343
nuclear@4 344 Mesh *mesh = new Mesh;
nuclear@3 345 mesh->set_attrib(MESH_ATTR_VERTEX, nelem, 3, &varr->x);
nuclear@3 346 mesh->set_attrib(MESH_ATTR_NORMAL, nelem, 3, &narr->x);
nuclear@3 347 mesh->set_attrib(MESH_ATTR_TEXCOORD, nelem, 2, &tarr->x);
nuclear@4 348 robj->set_mesh(mesh);
nuclear@4 349
nuclear@4 350 printf("loaded object %s: %d faces\n", obj->cur_obj.c_str(), nelem / 3);
nuclear@3 351
nuclear@3 352 delete [] varr;
nuclear@3 353 delete [] narr;
nuclear@3 354 delete [] tarr;
nuclear@3 355 return robj;
nuclear@3 356 }
nuclear@3 357
nuclear@3 358 static bool read_materials(FILE *fp, vector<ObjMat> *vmtl)
nuclear@3 359 {
nuclear@3 360 ObjMat mat;
nuclear@3 361
nuclear@3 362 for(;;) {
nuclear@3 363 char line[BUF_SZ];
nuclear@3 364 fgets(line, sizeof line, fp);
nuclear@3 365 if(feof(fp)) {
nuclear@3 366 break;
nuclear@3 367 }
nuclear@3 368
nuclear@3 369 char *tok;
nuclear@3 370 if(!(tok = strtok(line, SEP))) {
nuclear@3 371 continue;
nuclear@3 372 }
nuclear@3 373
nuclear@3 374 int cmd;
nuclear@3 375 if((cmd = get_cmd(tok)) == -1) {
nuclear@3 376 continue;
nuclear@3 377 }
nuclear@3 378
nuclear@3 379 switch(cmd) {
nuclear@3 380 case CMD_NEWMTL:
nuclear@3 381 // add the previous material, and start a new one
nuclear@3 382 if(mat.name.length() > 0) {
nuclear@3 383 vmtl->push_back(mat);
nuclear@3 384 mat.reset();
nuclear@3 385 }
nuclear@3 386 if((tok = strtok(0, SEP))) {
nuclear@3 387 mat.name = tok;
nuclear@3 388 }
nuclear@3 389 break;
nuclear@3 390
nuclear@6 391 case CMD_KE:
nuclear@6 392 parse_color(&mat.emissive);
nuclear@6 393 break;
nuclear@6 394
nuclear@3 395 case CMD_KA:
nuclear@3 396 parse_color(&mat.ambient);
nuclear@3 397 break;
nuclear@3 398
nuclear@3 399 case CMD_KD:
nuclear@3 400 parse_color(&mat.diffuse);
nuclear@3 401 break;
nuclear@3 402
nuclear@3 403 case CMD_KS:
nuclear@3 404 parse_color(&mat.specular);
nuclear@3 405 break;
nuclear@3 406
nuclear@3 407 case CMD_NS:
nuclear@3 408 if((tok = strtok(0, SEP)) && is_float(tok)) {
nuclear@3 409 mat.shininess = atof(tok);
nuclear@3 410 }
nuclear@3 411 break;
nuclear@3 412
nuclear@3 413 case CMD_NI:
nuclear@3 414 if((tok = strtok(0, SEP)) && is_float(tok)) {
nuclear@3 415 mat.ior = atof(tok);
nuclear@3 416 }
nuclear@3 417 break;
nuclear@3 418
nuclear@3 419 case CMD_D:
nuclear@3 420 case CMD_TR:
nuclear@3 421 {
nuclear@3 422 Color c;
nuclear@3 423 if(parse_color(&c)) {
nuclear@3 424 mat.alpha = cmd == CMD_D ? c.x : 1.0 - c.x;
nuclear@3 425 }
nuclear@3 426 }
nuclear@3 427 break;
nuclear@3 428
nuclear@3 429 case CMD_MAP_KD:
nuclear@3 430 mat.tex_dif = parse_map();
nuclear@3 431 break;
nuclear@3 432
nuclear@6 433 case CMD_MAP_REFL:
nuclear@6 434 mat.tex_refl = parse_map();
nuclear@6 435 break;
nuclear@6 436
nuclear@3 437 default:
nuclear@3 438 break;
nuclear@3 439 }
nuclear@3 440 }
nuclear@3 441
nuclear@3 442 if(mat.name.length() > 0) {
nuclear@3 443 vmtl->push_back(mat);
nuclear@3 444 }
nuclear@3 445 return true;
nuclear@3 446 }
nuclear@3 447
nuclear@3 448 static int get_cmd(char *str)
nuclear@3 449 {
nuclear@3 450 char *s = str;
nuclear@3 451 while((*s = toupper(*s))) s++;
nuclear@3 452
nuclear@3 453 for(int i=0; cmd_names[i]; i++) {
nuclear@3 454 if(strcmp(str, cmd_names[i]) == 0) {
nuclear@3 455 return i;
nuclear@3 456 }
nuclear@3 457 }
nuclear@3 458 return CMD_UNK;
nuclear@3 459 }
nuclear@3 460
nuclear@3 461 static bool is_int(const char *str)
nuclear@3 462 {
nuclear@3 463 char *tmp;
nuclear@3 464 strtol(str, &tmp, 10);
nuclear@3 465 return tmp != str;
nuclear@3 466 }
nuclear@3 467
nuclear@3 468 static bool is_float(const char *str)
nuclear@3 469 {
nuclear@3 470 char *tmp;
nuclear@3 471 strtod(str, &tmp);
nuclear@3 472 return tmp != str;
nuclear@3 473 }
nuclear@3 474
nuclear@3 475 static bool parse_vec(Vector3 *vec)
nuclear@3 476 {
nuclear@3 477 for(int i=0; i<3; i++) {
nuclear@3 478 char *tok;
nuclear@3 479
nuclear@3 480 if(!(tok = strtok(0, SEP)) || !is_float(tok)) {
nuclear@3 481 if(i < 2) {
nuclear@3 482 return false;
nuclear@3 483 }
nuclear@3 484 vec->z = 0.0;
nuclear@3 485 } else {
nuclear@3 486 (*vec)[i] = atof(tok);
nuclear@3 487 }
nuclear@3 488 }
nuclear@3 489 return true;
nuclear@3 490 }
nuclear@3 491
nuclear@3 492 static bool parse_color(Color *col)
nuclear@3 493 {
nuclear@3 494 for(int i=0; i<3; i++) {
nuclear@3 495 char *tok;
nuclear@3 496
nuclear@3 497 if(!(tok = strtok(0, SEP)) || !is_float(tok)) {
nuclear@3 498 col->y = col->z = col->x;
nuclear@3 499 return i > 0 ? true : false;
nuclear@3 500 }
nuclear@3 501 (*col)[i] = atof(tok);
nuclear@3 502 }
nuclear@3 503 return true;
nuclear@3 504 }
nuclear@3 505
nuclear@3 506 static bool parse_face(ObjFace *face)
nuclear@3 507 {
nuclear@3 508 char *tok[] = {0, 0, 0, 0};
nuclear@3 509 face->elem = 0;
nuclear@3 510
nuclear@3 511 for(int i=0; i<4; i++) {
nuclear@3 512 if((!(tok[i] = strtok(0, SEP)) || !is_int(tok[i]))) {
nuclear@3 513 if(i < 3) return false; // less than 3 verts? not a polygon
nuclear@3 514 } else {
nuclear@3 515 face->elem++;
nuclear@3 516 }
nuclear@3 517 }
nuclear@3 518
nuclear@3 519 for(int i=0; i<4; i++) {
nuclear@3 520 char *subtok = tok[i];
nuclear@3 521
nuclear@3 522 if(!subtok || !*subtok || !is_int(subtok)) {
nuclear@3 523 if(i < 3) {
nuclear@3 524 return false;
nuclear@3 525 }
nuclear@3 526 face->v[i] = INVALID_IDX;
nuclear@3 527 } else {
nuclear@3 528 face->v[i] = atoi(subtok);
nuclear@3 529 if(face->v[i] > 0) face->v[i]--; /* convert to 0-based */
nuclear@3 530 }
nuclear@3 531
nuclear@3 532 while(subtok && *subtok && *subtok != '/') {
nuclear@3 533 subtok++;
nuclear@3 534 }
nuclear@3 535 if(subtok && *subtok && *++subtok && is_int(subtok)) {
nuclear@3 536 face->t[i] = atoi(subtok);
nuclear@3 537 if(face->t[i] > 0) face->t[i]--; /* convert to 0-based */
nuclear@3 538 } else {
nuclear@3 539 face->t[i] = INVALID_IDX;
nuclear@3 540 }
nuclear@3 541
nuclear@3 542 while(subtok && *subtok && *subtok != '/') {
nuclear@3 543 subtok++;
nuclear@3 544 }
nuclear@3 545 if(subtok && *subtok && *++subtok && is_int(subtok)) {
nuclear@3 546 face->n[i] = atoi(subtok);
nuclear@3 547 if(face->n[i] > 0) face->n[i]--; /* convert to 0-based */
nuclear@3 548 } else {
nuclear@3 549 face->n[i] = INVALID_IDX;
nuclear@3 550 }
nuclear@3 551 }
nuclear@3 552
nuclear@3 553 return true;
nuclear@3 554 }
nuclear@3 555
nuclear@3 556 static const char *parse_map()
nuclear@3 557 {
nuclear@3 558 char *tok, *prev = 0;
nuclear@3 559
nuclear@3 560 while((tok = strtok(0, SEP))) {
nuclear@3 561 prev = tok;
nuclear@3 562 }
nuclear@3 563
nuclear@3 564 return prev ? prev : "";
nuclear@3 565 }