3d/interp.c

   1 /* $Id: interp.c,v 1.12 2003-02-13 22:02:29 btb Exp $ */
   2 /*
   3 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   4 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   5 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   6 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   7 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   8 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   9 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
  10 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  11 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  12 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  13 */
  14
  15 /*
  16  *
  17  * Polygon object interpreter
  18  *
  19  * Old Log:
  20  * Revision 1.4  1995/10/10  22:20:09  allender
  21  * new morphing code from Matt
  22  *
  23  * Revision 1.3  1995/08/31  15:40:24  allender
  24  * swap color data correctly
  25  *
  26  * Revision 1.2  1995/05/11  13:06:38  allender
  27  * fix int --> short problem
  28  *
  29  * Revision 1.1  1995/05/05  08:51:41  allender
  30  * Initial revision
  31  *
  32  * Revision 1.1  1995/04/17  06:44:33  matt
  33  * Initial revision
  34  *
  35  *
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include <conf.h>
  40 #endif
  41
  42 #ifdef RCS
  43 static char rcsid[] = "$Id: interp.c,v 1.12 2003-02-13 22:02:29 btb Exp $";
  44 #endif
  45
  46 #include <stdlib.h>
  47 #include "error.h"
  48
  49 #include "interp.h"
  50 #include "globvars.h"
  51 #include "gr.h"
  52 #include "byteswap.h"
  53 #include "u_mem.h"
  54
  55 #define OP_EOF          0   //eof
  56 #define OP_DEFPOINTS    1   //defpoints
  57 #define OP_FLATPOLY     2   //flat-shaded polygon
  58 #define OP_TMAPPOLY     3   //texture-mapped polygon
  59 #define OP_SORTNORM     4   //sort by normal
  60 #define OP_RODBM        5   //rod bitmap
  61 #define OP_SUBCALL      6   //call a subobject
  62 #define OP_DEFP_START   7   //defpoints with start
  63 #define OP_GLOW         8   //glow value for next poly
  64
  65 //#define N_OPCODES (sizeof(opcode_table) / sizeof(*opcode_table))
  66
  67 #define MAX_POINTS_PER_POLY 25
  68
  69 short highest_texture_num;
  70 int g3d_interp_outline;
  71
  72 g3s_point *Interp_point_list = NULL;
  73
  74 #define MAX_INTERP_COLORS 100
  75
  76 //this is a table of mappings from RGB15 to palette colors
  77 struct {short pal_entry,rgb15;} interp_color_table[MAX_INTERP_COLORS];
  78
  79 int n_interp_colors=0;
  80
  81 //gives the interpreter an array of points to use
  82 void g3_set_interp_points(g3s_point *pointlist)
  83 {
  84         Interp_point_list = pointlist;
  85 }
  86
  87 #define w(p)  (*((short *) (p)))
  88 #define wp(p)  ((short *) (p))
  89 #define fp(p)  ((fix *) (p))
  90 #define vp(p)  ((vms_vector *) (p))
  91
  92 void rotate_point_list(g3s_point *dest,vms_vector *src,int n)
  93 {
  94         while (n--)
  95                 g3_rotate_point(dest++,src++);
  96 }
  97
  98 vms_angvec zero_angles = {0,0,0};
  99
 100 g3s_point *point_list[MAX_POINTS_PER_POLY];
 101
 102 int glow_num = -1;
 103
 104 #ifdef WORDS_BIGENDIAN
 105 void short_swap(short *s)
 106 {
 107         *s = SWAPSHORT(*s);
 108 }
 109
 110 void fix_swap(fix *f)
 111 {
 112         *f = (fix)SWAPINT((int)*f);
 113 }
 114
 115 void vms_vector_swap(vms_vector *v)
 116 {
 117         fix_swap(fp(&v->x));
 118         fix_swap(fp(&v->y));
 119         fix_swap(fp(&v->z));
 120 }
 121
 122 void swap_polygon_model_data(ubyte *data)
 123 {
 124         int i;
 125         short n;
 126         g3s_uvl *uvl_val;
 127         ubyte *p = data;
 128
 129         short_swap(wp(p));
 130
 131         while (w(p) != OP_EOF) {
 132                 switch (w(p)) {
 133                         case OP_DEFPOINTS:
 134                                 short_swap(wp(p + 2));
 135                                 n = w(p+2);
 136                                 for (i = 0; i < n; i++)
 137                                         vms_vector_swap(vp((p + 4) + (i * sizeof(vms_vector))));
 138                                 p += n*sizeof(struct vms_vector) + 4;
 139                                 break;
 140
 141                         case OP_DEFP_START:
 142                                 short_swap(wp(p + 2));
 143                                 short_swap(wp(p + 4));
 144                                 n = w(p+2);
 145                                 for (i = 0; i < n; i++)
 146                                         vms_vector_swap(vp((p + 8) + (i * sizeof(vms_vector))));
 147                                 p += n*sizeof(struct vms_vector) + 8;
 148                                 break;
 149
 150                         case OP_FLATPOLY:
 151                                 short_swap(wp(p+2));
 152                                 n = w(p+2);
 153                                 vms_vector_swap(vp(p + 4));
 154                                 vms_vector_swap(vp(p + 16));
 155                                 short_swap(wp(p+28));
 156 #ifdef MACINTOSH
 157                                 // swap the colors 0 and 255 here!!!!
 158                                 if (w(p+28) == 0)
 159                                         w(p+28) = 255;
 160                                 else if (w(p+28) == 255)
 161                                         w(p+28) = 0;
 162 #endif
 163                                 for (i=0; i < n; i++)
 164                                         short_swap(wp(p + 30 + (i * 2)));
 165                                 p += 30 + ((n&~1)+1)*2;
 166                                 break;
 167
 168                         case OP_TMAPPOLY:
 169                                 short_swap(wp(p+2));
 170                                 n = w(p+2);
 171                                 vms_vector_swap(vp(p + 4));
 172                                 vms_vector_swap(vp(p + 16));
 173                                 for (i=0;i<n;i++) {
 174                                         uvl_val = (g3s_uvl *)((p+30+((n&~1)+1)*2) + (i * sizeof(g3s_uvl)));
 175                                         fix_swap(&uvl_val->u);
 176                                         fix_swap(&uvl_val->v);
 177                                 }
 178                                 short_swap(wp(p+28));
 179                                 for (i=0;i<n;i++)
 180                                         short_swap(wp(p + 30 + (i * 2)));
 181                                 p += 30 + ((n&~1)+1)*2 + n*12;
 182                                 break;
 183
 184                         case OP_SORTNORM:
 185                                 vms_vector_swap(vp(p + 4));
 186                                 vms_vector_swap(vp(p + 16));
 187                                 short_swap(wp(p + 28));
 188                                 short_swap(wp(p + 30));
 189                                 swap_polygon_model_data(p + w(p+28));
 190                                 swap_polygon_model_data(p + w(p+30));
 191                                 p += 32;
 192                                 break;
 193
 194                         case OP_RODBM:
 195                                 vms_vector_swap(vp(p + 20));
 196                                 vms_vector_swap(vp(p + 4));
 197                                 short_swap(wp(p+2));
 198                                 fix_swap(fp(p + 16));
 199                                 fix_swap(fp(p + 32));
 200                                 p+=36;
 201                                 break;
 202
 203                         case OP_SUBCALL:
 204                                 short_swap(wp(p+2));
 205                                 vms_vector_swap(vp(p+4));
 206                                 short_swap(wp(p+16));
 207                                 swap_polygon_model_data(p + w(p+16));
 208                                 p += 20;
 209                                 break;
 210
 211                         case OP_GLOW:
 212                                 short_swap(wp(p + 2));
 213                                 p += 4;
 214                                 break;
 215
 216                         default:
 217                                 Error("invalid polygon model\n"); //Int3();
 218                 }
 219                 short_swap(wp(p));
 220         }
 221 }
 222 #endif
 223
 224 #ifdef WORDS_NEED_ALIGNMENT
 225 void add_chunk(ubyte *old_base, ubyte *new_base, int offset,
 226                chunk *chunk_list, int *no_chunks)
 227 {
 228         Assert(*no_chunks + 1 < MAX_CHUNKS); //increase MAX_CHUNKS if you get this
 229         chunk_list[*no_chunks].old_base = old_base;
 230         chunk_list[*no_chunks].new_base = new_base;
 231         chunk_list[*no_chunks].offset = offset;
 232         chunk_list[*no_chunks].correction = 0;
 233         (*no_chunks)++;
 234 }
 235
 236 /*
 237  * finds what chunks the data points to, adds them to the chunk_list,
 238  * and returns the length of the current chunk
 239  */
 240 int get_chunks(ubyte *data, ubyte *new_data, chunk *list, int *no)
 241 {
 242         short n;
 243         ubyte *p = data;
 244
 245         while (INTEL_SHORT(w(p)) != OP_EOF) {
 246                 switch (INTEL_SHORT(w(p))) {
 247                 case OP_DEFPOINTS:
 248                         n = INTEL_SHORT(w(p+2));
 249                         p += n*sizeof(struct vms_vector) + 4;
 250                         break;
 251                 case OP_DEFP_START:
 252                         n = INTEL_SHORT(w(p+2));
 253                         p += n*sizeof(struct vms_vector) + 8;
 254                         break;
 255                 case OP_FLATPOLY:
 256                         n = INTEL_SHORT(w(p+2));
 257                         p += 30 + ((n&~1)+1)*2;
 258                         break;
 259                 case OP_TMAPPOLY:
 260                         n = INTEL_SHORT(w(p+2));
 261                         p += 30 + ((n&~1)+1)*2 + n*12;
 262                         break;
 263                 case OP_SORTNORM:
 264                         add_chunk(p, p - data + new_data, 28, list, no);
 265                         add_chunk(p, p - data + new_data, 30, list, no);
 266                         p += 32;
 267                         break;
 268                 case OP_RODBM:
 269                         p+=36;
 270                         break;
 271                 case OP_SUBCALL:
 272                         add_chunk(p, p - data + new_data, 16, list, no);
 273                         p+=20;
 274                         break;
 275                 case OP_GLOW:
 276                         p += 4;
 277                         break;
 278                 default:
 279                         Error("invalid polygon model\n");
 280                 }
 281         }
 282         return p + 2 - data;
 283 }
 284 #endif //def WORDS_NEED_ALIGNMENT
 285
 286 void verify(ubyte *data)
 287 {
 288         short n;
 289         ubyte *p = data;
 290
 291         while (w(p) != OP_EOF) {
 292                 switch (w(p)) {
 293                 case OP_DEFPOINTS:
 294                         n = (w(p+2));
 295                         p += n*sizeof(struct vms_vector) + 4;
 296                         break;
 297                 case OP_DEFP_START:
 298                         n = (w(p+2));
 299                         p += n*sizeof(struct vms_vector) + 8;
 300                         break;
 301                 case OP_FLATPOLY:
 302                         n = (w(p+2));
 303                         p += 30 + ((n&~1)+1)*2;
 304                         break;
 305                 case OP_TMAPPOLY:
 306                         n = (w(p+2));
 307                         p += 30 + ((n&~1)+1)*2 + n*12;
 308                         break;
 309                 case OP_SORTNORM:
 310                         verify(p + w(p + 28));
 311                         verify(p + w(p + 30));
 312                         p += 32;
 313                         break;
 314                 case OP_RODBM:
 315                         p+=36;
 316                         break;
 317                 case OP_SUBCALL:
 318                         verify(p + w(p + 16));
 319                         p+=20;
 320                         break;
 321                 case OP_GLOW:
 322                         p += 4;
 323                         break;
 324                 default:
 325                         Error("invalid polygon model\n");
 326                 }
 327         }
 328 }
 329
 330
 331 //calls the object interpreter to render an object.  The object renderer
 332 //is really a seperate pipeline. returns true if drew
 333 bool g3_draw_polygon_model(void *model_ptr,grs_bitmap **model_bitmaps,vms_angvec *anim_angles,fix model_light,fix *glow_values)
 334 {
 335         ubyte *p = model_ptr;
 336
 337         glow_num = -1;          //glow off by default
 338
 339         while (w(p) != OP_EOF)
 340
 341                 switch (w(p)) {
 342
 343                         case OP_DEFPOINTS: {
 344                                 int n = w(p+2);
 345
 346                                 rotate_point_list(Interp_point_list,vp(p+4),n);
 347                                 p += n*sizeof(struct vms_vector) + 4;
 348
 349                                 break;
 350                         }
 351
 352                         case OP_DEFP_START: {
 353                                 int n = w(p+2);
 354                                 int s = w(p+4);
 355
 356                                 rotate_point_list(&Interp_point_list[s],vp(p+8),n);
 357                                 p += n*sizeof(struct vms_vector) + 8;
 358
 359                                 break;
 360                         }
 361
 362                         case OP_FLATPOLY: {
 363                                 int nv = w(p+2);
 364
 365                                 Assert( nv < MAX_POINTS_PER_POLY );
 366                                 if (g3_check_normal_facing(vp(p+4),vp(p+16)) > 0) {
 367                                         int i;
 368                                         short c;
 369                                         unsigned char cc;
 370                                         int l;
 371
 372 //                                      DPH: Now we treat this color as 15bpp
 373 //                                      gr_setcolor(w(p+28));
 374
 375                                         //l = (32 * model_light) >> 16;
 376                                         l = f2i(fixmul(i2f(32), model_light));
 377                                         if (l<0) l = 0;
 378                                         else if (l>32) l = 32;
 379                                         cc = gr_find_closest_color_15bpp(w(p+28));
 380                                         c = gr_fade_table[(l<<8)|cc];
 381                                         gr_setcolor(c);
 382
 383                                         for (i=0;i<nv;i++)
 384                                                 point_list[i] = Interp_point_list + wp(p+30)[i];
 385
 386                                         g3_draw_poly(nv,point_list);
 387                                 }
 388
 389                                 p += 30 + ((nv&~1)+1)*2;
 390
 391                                 break;
 392                         }
 393
 394                         case OP_TMAPPOLY: {
 395                                 int nv = w(p+2);
 396                                 g3s_uvl *uvl_list;
 397
 398                                 Assert( nv < MAX_POINTS_PER_POLY );
 399                                 if (g3_check_normal_facing(vp(p+4),vp(p+16)) > 0) {
 400                                         int i;
 401                                         fix light;
 402
 403                                         //calculate light from surface normal
 404
 405                                         if (glow_num < 0) {                     //no glow
 406
 407                                                 light = -vm_vec_dot(&View_matrix.fvec,vp(p+16));
 408                                                 light = f1_0/4 + (light*3)/4;
 409                                                 light = fixmul(light,model_light);
 410                                         }
 411                                         else {                          //yes glow
 412                                                 light = glow_values[glow_num];
 413                                                 glow_num = -1;
 414                                         }
 415
 416                                         //now poke light into l values
 417
 418                                         uvl_list = (g3s_uvl *) (p+30+((nv&~1)+1)*2);
 419
 420                                         for (i=0;i<nv;i++)
 421                                                 uvl_list[i].l = light;
 422
 423                                         for (i=0;i<nv;i++)
 424                                                 point_list[i] = Interp_point_list + wp(p+30)[i];
 425
 426                                         g3_draw_tmap(nv,point_list,uvl_list,model_bitmaps[w(p+28)]);
 427                                 }
 428
 429                                 p += 30 + ((nv&~1)+1)*2 + nv*12;
 430
 431                                 break;
 432                         }
 433
 434                         case OP_SORTNORM:
 435
 436                                 if (g3_check_normal_facing(vp(p+16),vp(p+4)) > 0) {             //facing
 437
 438                                         //draw back then front
 439
 440                                         g3_draw_polygon_model(p+w(p+30),model_bitmaps,anim_angles,model_light,glow_values);
 441                                         g3_draw_polygon_model(p+w(p+28),model_bitmaps,anim_angles,model_light,glow_values);
 442
 443                                 }
 444                                 else {                  //not facing.  draw front then back
 445
 446                                         g3_draw_polygon_model(p+w(p+28),model_bitmaps,anim_angles,model_light,glow_values);
 447                                         g3_draw_polygon_model(p+w(p+30),model_bitmaps,anim_angles,model_light,glow_values);
 448                                 }
 449
 450                                 p += 32;
 451
 452                                 break;
 453
 454
 455                         case OP_RODBM: {
 456                                 g3s_point rod_bot_p,rod_top_p;
 457
 458                                 g3_rotate_point(&rod_bot_p,vp(p+20));
 459                                 g3_rotate_point(&rod_top_p,vp(p+4));
 460
 461                                 g3_draw_rod_tmap(model_bitmaps[w(p+2)],&rod_bot_p,w(p+16),&rod_top_p,w(p+32),f1_0);
 462
 463                                 p+=36;
 464                                 break;
 465                         }
 466
 467                         case OP_SUBCALL: {
 468                                 vms_angvec *a;
 469
 470                                 if (anim_angles)
 471                                         a = &anim_angles[w(p+2)];
 472                                 else
 473                                         a = &zero_angles;
 474
 475                                 g3_start_instance_angles(vp(p+4),a);
 476
 477                                 g3_draw_polygon_model(p+w(p+16),model_bitmaps,anim_angles,model_light,glow_values);
 478
 479                                 g3_done_instance();
 480
 481                                 p += 20;
 482
 483                                 break;
 484
 485                         }
 486
 487                         case OP_GLOW:
 488
 489                                 if (glow_values)
 490                                         glow_num = w(p+2);
 491                                 p += 4;
 492                                 break;
 493
 494                         default:
 495                                 Error("invalid polygon model\n");
 496                 }
 497         return 1;
 498 }
 499
 500 extern int gr_find_closest_color_15bpp( int rgb );
 501
 502 #ifndef NDEBUG
 503 int nest_count;
 504 #endif
 505
 506 //alternate interpreter for morphing object
 507 bool g3_draw_morphing_model(void *model_ptr,grs_bitmap **model_bitmaps,vms_angvec *anim_angles,fix model_light,vms_vector *new_points)
 508 {
 509         ubyte *p = model_ptr;
 510         fix *glow_values = NULL;
 511
 512         glow_num = -1;          //glow off by default
 513
 514         while (w(p) != OP_EOF)
 515
 516                 switch (w(p)) {
 517
 518                         case OP_DEFPOINTS: {
 519                                 int n = w(p+2);
 520
 521                                 rotate_point_list(Interp_point_list,new_points,n);
 522                                 p += n*sizeof(struct vms_vector) + 4;
 523
 524                                 break;
 525                         }
 526
 527                         case OP_DEFP_START: {
 528                                 int n = w(p+2);
 529                                 int s = w(p+4);
 530
 531                                 rotate_point_list(&Interp_point_list[s],new_points,n);
 532                                 p += n*sizeof(struct vms_vector) + 8;
 533
 534                                 break;
 535                         }
 536
 537                         case OP_FLATPOLY: {
 538                                 int nv = w(p+2);
 539                                 int i,ntris;
 540
 541                                 gr_setcolor(w(p+28));
 542
 543                                 for (i=0;i<2;i++)
 544                                         point_list[i] = Interp_point_list + wp(p+30)[i];
 545
 546                                 for (ntris=nv-2;ntris;ntris--) {
 547
 548                                         point_list[2] = Interp_point_list + wp(p+30)[i++];
 549
 550                                         g3_check_and_draw_poly(3,point_list,NULL,NULL);
 551
 552                                         point_list[1] = point_list[2];
 553
 554                                 }
 555
 556                                 p += 30 + ((nv&~1)+1)*2;
 557
 558                                 break;
 559                         }
 560
 561                         case OP_TMAPPOLY: {
 562                                 int nv = w(p+2);
 563                                 g3s_uvl *uvl_list;
 564                                 g3s_uvl morph_uvls[3];
 565                                 int i,ntris;
 566                                 fix light;
 567
 568                                 //calculate light from surface normal
 569
 570                                 if (glow_num < 0) {                     //no glow
 571
 572                                         light = -vm_vec_dot(&View_matrix.fvec,vp(p+16));
 573                                         light = f1_0/4 + (light*3)/4;
 574                                         light = fixmul(light,model_light);
 575                                 }
 576                                 else {                          //yes glow
 577                                         light = glow_values[glow_num];
 578                                         glow_num = -1;
 579                                 }
 580
 581                                 //now poke light into l values
 582
 583                                 uvl_list = (g3s_uvl *) (p+30+((nv&~1)+1)*2);
 584
 585                                 for (i=0;i<3;i++)
 586                                         morph_uvls[i].l = light;
 587
 588                                 for (i=0;i<2;i++) {
 589                                         point_list[i] = Interp_point_list + wp(p+30)[i];
 590
 591                                         morph_uvls[i].u = uvl_list[i].u;
 592                                         morph_uvls[i].v = uvl_list[i].v;
 593                                 }
 594
 595                                 for (ntris=nv-2;ntris;ntris--) {
 596
 597                                         point_list[2] = Interp_point_list + wp(p+30)[i];
 598                                         morph_uvls[2].u = uvl_list[i].u;
 599                                         morph_uvls[2].v = uvl_list[i].v;
 600                                         i++;
 601
 602                                         g3_check_and_draw_tmap(3,point_list,uvl_list,model_bitmaps[w(p+28)],NULL,NULL);
 603
 604                                         point_list[1] = point_list[2];
 605                                         morph_uvls[1].u = morph_uvls[2].u;
 606                                         morph_uvls[1].v = morph_uvls[2].v;
 607
 608                                 }
 609
 610                                 p += 30 + ((nv&~1)+1)*2 + nv*12;
 611
 612                                 break;
 613                         }
 614
 615                         case OP_SORTNORM:
 616
 617                                 if (g3_check_normal_facing(vp(p+16),vp(p+4)) > 0) {             //facing
 618
 619                                         //draw back then front
 620
 621                                         g3_draw_morphing_model(p+w(p+30),model_bitmaps,anim_angles,model_light,new_points);
 622                                         g3_draw_morphing_model(p+w(p+28),model_bitmaps,anim_angles,model_light,new_points);
 623
 624                                 }
 625                                 else {                  //not facing.  draw front then back
 626
 627                                         g3_draw_morphing_model(p+w(p+28),model_bitmaps,anim_angles,model_light,new_points);
 628                                         g3_draw_morphing_model(p+w(p+30),model_bitmaps,anim_angles,model_light,new_points);
 629                                 }
 630
 631                                 p += 32;
 632
 633                                 break;
 634
 635
 636                         case OP_RODBM: {
 637                                 g3s_point rod_bot_p,rod_top_p;
 638
 639                                 g3_rotate_point(&rod_bot_p,vp(p+20));
 640                                 g3_rotate_point(&rod_top_p,vp(p+4));
 641
 642                                 g3_draw_rod_tmap(model_bitmaps[w(p+2)],&rod_bot_p,w(p+16),&rod_top_p,w(p+32),f1_0);
 643
 644                                 p+=36;
 645                                 break;
 646                         }
 647
 648                         case OP_SUBCALL: {
 649                                 vms_angvec *a;
 650
 651                                 if (anim_angles)
 652                                         a = &anim_angles[w(p+2)];
 653                                 else
 654                                         a = &zero_angles;
 655
 656                                 g3_start_instance_angles(vp(p+4),a);
 657
 658                                 g3_draw_polygon_model(p+w(p+16),model_bitmaps,anim_angles,model_light,glow_values);
 659
 660                                 g3_done_instance();
 661
 662                                 p += 20;
 663
 664                                 break;
 665
 666                         }
 667
 668                         case OP_GLOW:
 669
 670                                 if (glow_values)
 671                                         glow_num = w(p+2);
 672                                 p += 4;
 673                                 break;
 674                 }
 675
 676         return 1;
 677 }
 678
 679 void init_model_sub(ubyte *p)
 680 {
 681         Assert(++nest_count < 1000);
 682
 683         while (w(p) != OP_EOF) {
 684
 685                 switch (w(p)) {
 686
 687                         case OP_DEFPOINTS: {
 688                                 int n = w(p+2);
 689                                 p += n*sizeof(struct vms_vector) + 4;
 690                                 break;
 691                         }
 692
 693                         case OP_DEFP_START: {
 694                                 int n = w(p+2);
 695                                 p += n*sizeof(struct vms_vector) + 8;
 696                                 break;
 697                         }
 698
 699                         case OP_FLATPOLY: {
 700                                 int nv = w(p+2);
 701
 702                                 Assert(nv > 2);         //must have 3 or more points
 703
 704 //                              *wp(p+28) = (short)gr_find_closest_color_15bpp(w(p+28));
 705
 706                                 p += 30 + ((nv&~1)+1)*2;
 707
 708                                 break;
 709                         }
 710
 711                         case OP_TMAPPOLY: {
 712                                 int nv = w(p+2);
 713
 714                                 Assert(nv > 2);         //must have 3 or more points
 715
 716                                 if (w(p+28) > highest_texture_num)
 717                                         highest_texture_num = w(p+28);
 718
 719                                 p += 30 + ((nv&~1)+1)*2 + nv*12;
 720
 721                                 break;
 722                         }
 723
 724                         case OP_SORTNORM:
 725
 726                                 init_model_sub(p+w(p+28));
 727                                 init_model_sub(p+w(p+30));
 728                                 p += 32;
 729
 730                                 break;
 731
 732
 733                         case OP_RODBM:
 734                                 p += 36;
 735                                 break;
 736
 737
 738                         case OP_SUBCALL: {
 739                                 init_model_sub(p+w(p+16));
 740                                 p += 20;
 741                                 break;
 742
 743                         }
 744
 745                         case OP_GLOW:
 746                                 p += 4;
 747                                 break;
 748                         default:
 749                                 Error("invalid polygon model\n");
 750                 }
 751         }
 752 }
 753
 754 //init code for bitmap models
 755 void g3_init_polygon_model(void *model_ptr)
 756 {
 757         #ifndef NDEBUG
 758         nest_count = 0;
 759         #endif
 760
 761         highest_texture_num = -1;
 762
 763         init_model_sub((ubyte *) model_ptr);
 764 }