model_shared.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // models.c -- model loading and caching
  21
  22 // models are the only shared resource between a client and server running
  23 // on the same machine.
  24
  25 #include "quakedef.h"
  26 #include "image.h"
  27 #include "r_shadow.h"
  28
  29 cvar_t r_mipskins = {CVAR_SAVE, "r_mipskins", "0"};
  30
  31 model_t *loadmodel;
  32
  33 // LordHavoc: increased from 512 to 2048
  34 #define MAX_MOD_KNOWN   2048
  35 static model_t mod_known[MAX_MOD_KNOWN];
  36
  37 rtexturepool_t *mod_shared_texturepool;
  38 rtexture_t *r_notexture;
  39 rtexture_t *mod_shared_detailtextures[NUM_DETAILTEXTURES];
  40
  41 void Mod_BuildDetailTextures (void)
  42 {
  43         int i, x, y, light;
  44         float vc[3], vx[3], vy[3], vn[3], lightdir[3];
  45 #define DETAILRESOLUTION 256
  46         qbyte data[DETAILRESOLUTION][DETAILRESOLUTION][4], noise[DETAILRESOLUTION][DETAILRESOLUTION];
  47         lightdir[0] = 0.5;
  48         lightdir[1] = 1;
  49         lightdir[2] = -0.25;
  50         VectorNormalize(lightdir);
  51         for (i = 0;i < NUM_DETAILTEXTURES;i++)
  52         {
  53                 fractalnoise(&noise[0][0], DETAILRESOLUTION, DETAILRESOLUTION >> 4);
  54                 for (y = 0;y < DETAILRESOLUTION;y++)
  55                 {
  56                         for (x = 0;x < DETAILRESOLUTION;x++)
  57                         {
  58                                 vc[0] = x;
  59                                 vc[1] = y;
  60                                 vc[2] = noise[y][x] * (1.0f / 32.0f);
  61                                 vx[0] = x + 1;
  62                                 vx[1] = y;
  63                                 vx[2] = noise[y][(x + 1) % DETAILRESOLUTION] * (1.0f / 32.0f);
  64                                 vy[0] = x;
  65                                 vy[1] = y + 1;
  66                                 vy[2] = noise[(y + 1) % DETAILRESOLUTION][x] * (1.0f / 32.0f);
  67                                 VectorSubtract(vx, vc, vx);
  68                                 VectorSubtract(vy, vc, vy);
  69                                 CrossProduct(vx, vy, vn);
  70                                 VectorNormalize(vn);
  71                                 light = 128 - DotProduct(vn, lightdir) * 128;
  72                                 light = bound(0, light, 255);
  73                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = light;
  74                                 data[y][x][3] = 255;
  75                         }
  76                 }
  77                 mod_shared_detailtextures[i] = R_LoadTexture2D(mod_shared_texturepool, va("detailtexture%i", i), DETAILRESOLUTION, DETAILRESOLUTION, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_PRECACHE, NULL);
  78         }
  79 }
  80
  81 texture_t r_surf_notexture;
  82
  83 void Mod_SetupNoTexture(void)
  84 {
  85         int x, y;
  86         qbyte pix[16][16][4];
  87
  88         // this makes a light grey/dark grey checkerboard texture
  89         for (y = 0;y < 16;y++)
  90         {
  91                 for (x = 0;x < 16;x++)
  92                 {
  93                         if ((y < 8) ^ (x < 8))
  94                         {
  95                                 pix[y][x][0] = 128;
  96                                 pix[y][x][1] = 128;
  97                                 pix[y][x][2] = 128;
  98                                 pix[y][x][3] = 255;
  99                         }
 100                         else
 101                         {
 102                                 pix[y][x][0] = 64;
 103                                 pix[y][x][1] = 64;
 104                                 pix[y][x][2] = 64;
 105                                 pix[y][x][3] = 255;
 106                         }
 107                 }
 108         }
 109
 110         r_notexture = R_LoadTexture2D(mod_shared_texturepool, "notexture", 16, 16, &pix[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP, NULL);
 111 }
 112
 113 static void mod_start(void)
 114 {
 115         int i;
 116         for (i = 0;i < MAX_MOD_KNOWN;i++)
 117                 if (mod_known[i].name[0])
 118                         Mod_UnloadModel(&mod_known[i]);
 119         Mod_LoadModels();
 120
 121         mod_shared_texturepool = R_AllocTexturePool();
 122         Mod_SetupNoTexture();
 123         Mod_BuildDetailTextures();
 124 }
 125
 126 static void mod_shutdown(void)
 127 {
 128         int i;
 129         for (i = 0;i < MAX_MOD_KNOWN;i++)
 130                 if (mod_known[i].name[0])
 131                         Mod_UnloadModel(&mod_known[i]);
 132
 133         R_FreeTexturePool(&mod_shared_texturepool);
 134 }
 135
 136 static void mod_newmap(void)
 137 {
 138 }
 139
 140 /*
 141 ===============
 142 Mod_Init
 143 ===============
 144 */
 145 static void Mod_Print (void);
 146 static void Mod_Precache (void);
 147 void Mod_Init (void)
 148 {
 149         Mod_BrushInit();
 150         Mod_AliasInit();
 151         Mod_SpriteInit();
 152
 153         Cvar_RegisterVariable(&r_mipskins);
 154         Cmd_AddCommand ("modellist", Mod_Print);
 155         Cmd_AddCommand ("modelprecache", Mod_Precache);
 156 }
 157
 158 void Mod_RenderInit(void)
 159 {
 160         R_RegisterModule("Models", mod_start, mod_shutdown, mod_newmap);
 161 }
 162
 163 void Mod_FreeModel (model_t *mod)
 164 {
 165         R_FreeTexturePool(&mod->texturepool);
 166         Mem_FreePool(&mod->mempool);
 167
 168         // clear the struct to make it available
 169         memset(mod, 0, sizeof(model_t));
 170 }
 171
 172 void Mod_UnloadModel (model_t *mod)
 173 {
 174         char name[MAX_QPATH];
 175         qboolean isworldmodel;
 176         strcpy(name, mod->name);
 177         isworldmodel = mod->isworldmodel;
 178         Mod_FreeModel(mod);
 179         strcpy(mod->name, name);
 180         mod->isworldmodel = isworldmodel;
 181         mod->needload = true;
 182 }
 183
 184 /*
 185 ==================
 186 Mod_LoadModel
 187
 188 Loads a model
 189 ==================
 190 */
 191 static model_t *Mod_LoadModel(model_t *mod, qboolean crash, qboolean checkdisk, qboolean isworldmodel)
 192 {
 193         int num;
 194         unsigned int crc;
 195         void *buf;
 196
 197         mod->used = true;
 198
 199         if (mod->name[0] == '*') // submodel
 200                 return mod;
 201
 202         crc = 0;
 203         buf = NULL;
 204         if (!mod->needload)
 205         {
 206                 if (checkdisk)
 207                 {
 208                         buf = FS_LoadFile (mod->name, false);
 209                         if (!buf)
 210                         {
 211                                 if (crash)
 212                                         Host_Error ("Mod_LoadModel: %s not found", mod->name); // LordHavoc: Sys_Error was *ANNOYING*
 213                                 return NULL;
 214                         }
 215
 216                         crc = CRC_Block(buf, fs_filesize);
 217                 }
 218                 else
 219                         crc = mod->crc;
 220
 221                 if (mod->crc == crc && mod->isworldmodel == isworldmodel)
 222                 {
 223                         if (buf)
 224                                 Mem_Free(buf);
 225                         return mod; // already loaded
 226                 }
 227         }
 228
 229         Con_DPrintf("loading model %s\n", mod->name);
 230
 231         if (!buf)
 232         {
 233                 buf = FS_LoadFile (mod->name, false);
 234                 if (!buf)
 235                 {
 236                         if (crash)
 237                                 Host_Error ("Mod_LoadModel: %s not found", mod->name);
 238                         return NULL;
 239                 }
 240                 crc = CRC_Block(buf, fs_filesize);
 241         }
 242
 243         // allocate a new model
 244         loadmodel = mod;
 245
 246         // LordHavoc: unload the existing model in this slot (if there is one)
 247         Mod_UnloadModel(mod);
 248         mod->isworldmodel = isworldmodel;
 249         mod->used = true;
 250         mod->crc = crc;
 251         // errors can prevent the corresponding mod->needload = false;
 252         mod->needload = true;
 253
 254         // all models use memory, so allocate a memory pool
 255         mod->mempool = Mem_AllocPool(mod->name);
 256         // all models load textures, so allocate a texture pool
 257         if (cls.state != ca_dedicated)
 258                 mod->texturepool = R_AllocTexturePool();
 259
 260         // call the apropriate loader
 261         num = LittleLong(*((int *)buf));
 262              if (!memcmp(buf, "IDPO", 4)) Mod_IDP0_Load(mod, buf);
 263         else if (!memcmp(buf, "IDP2", 4)) Mod_IDP2_Load(mod, buf);
 264         else if (!memcmp(buf, "IDP3", 4)) Mod_IDP3_Load(mod, buf);
 265         else if (!memcmp(buf, "IDSP", 4)) Mod_IDSP_Load(mod, buf);
 266         else if (!memcmp(buf, "IBSP", 4)) Mod_IBSP_Load(mod, buf);
 267         else if (!memcmp(buf, "ZYMOTICMODEL", 12)) Mod_ZYMOTICMODEL_Load(mod, buf);
 268         else if (strlen(mod->name) >= 4 && !strcmp(mod->name - 4, ".map")) Mod_MAP_Load(mod, buf);
 269         else if (num == BSPVERSION || num == 30) Mod_Q1BSP_Load(mod, buf);
 270         else Host_Error("Mod_LoadModel: model \"%s\" is of unknown/unsupported type\n", mod->name);
 271
 272         Mem_Free(buf);
 273
 274         // no errors occurred
 275         mod->needload = false;
 276         return mod;
 277 }
 278
 279 void Mod_CheckLoaded(model_t *mod)
 280 {
 281         if (mod)
 282         {
 283                 if (mod->needload)
 284                         Mod_LoadModel(mod, true, true, mod->isworldmodel);
 285                 else
 286                 {
 287                         if (mod->type == mod_invalid)
 288                                 Host_Error("Mod_CheckLoaded: invalid model\n");
 289                         mod->used = true;
 290                         return;
 291                 }
 292         }
 293 }
 294
 295 /*
 296 ===================
 297 Mod_ClearAll
 298 ===================
 299 */
 300 void Mod_ClearAll(void)
 301 {
 302 }
 303
 304 void Mod_ClearUsed(void)
 305 {
 306         int i;
 307         model_t *mod;
 308
 309         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 310                 if (mod->name[0])
 311                         mod->used = false;
 312 }
 313
 314 void Mod_PurgeUnused(void)
 315 {
 316         int i;
 317         model_t *mod;
 318
 319         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 320                 if (mod->name[0])
 321                         if (!mod->used)
 322                                 Mod_FreeModel(mod);
 323 }
 324
 325 void Mod_LoadModels(void)
 326 {
 327         int i;
 328         model_t *mod;
 329
 330         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 331                 if (mod->name[0])
 332                         if (mod->used)
 333                                 Mod_CheckLoaded(mod);
 334 }
 335
 336 /*
 337 ==================
 338 Mod_FindName
 339
 340 ==================
 341 */
 342 model_t *Mod_FindName(const char *name)
 343 {
 344         int i;
 345         model_t *mod, *freemod;
 346
 347         if (!name[0])
 348                 Host_Error ("Mod_ForName: NULL name");
 349
 350 // search the currently loaded models
 351         freemod = NULL;
 352         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 353         {
 354                 if (mod->name[0])
 355                 {
 356                         if (!strcmp (mod->name, name))
 357                         {
 358                                 mod->used = true;
 359                                 return mod;
 360                         }
 361                 }
 362                 else if (freemod == NULL)
 363                         freemod = mod;
 364         }
 365
 366         if (freemod)
 367         {
 368                 mod = freemod;
 369                 strcpy (mod->name, name);
 370                 mod->needload = true;
 371                 mod->used = true;
 372                 return mod;
 373         }
 374
 375         Host_Error ("Mod_FindName: ran out of models\n");
 376         return NULL;
 377 }
 378
 379 /*
 380 ==================
 381 Mod_TouchModel
 382
 383 ==================
 384 */
 385 void Mod_TouchModel(const char *name)
 386 {
 387         model_t *mod;
 388
 389         mod = Mod_FindName(name);
 390         mod->used = true;
 391 }
 392
 393 /*
 394 ==================
 395 Mod_ForName
 396
 397 Loads in a model for the given name
 398 ==================
 399 */
 400 model_t *Mod_ForName(const char *name, qboolean crash, qboolean checkdisk, qboolean isworldmodel)
 401 {
 402         return Mod_LoadModel(Mod_FindName(name), crash, checkdisk, isworldmodel);
 403 }
 404
 405 qbyte *mod_base;
 406
 407
 408 //=============================================================================
 409
 410 /*
 411 ================
 412 Mod_Print
 413 ================
 414 */
 415 static void Mod_Print(void)
 416 {
 417         int             i;
 418         model_t *mod;
 419
 420         Con_Printf ("Loaded models:\n");
 421         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 422                 if (mod->name[0])
 423                         Con_Printf ("%4iK %s\n", mod->mempool ? (mod->mempool->totalsize + 1023) / 1024 : 0, mod->name);
 424 }
 425
 426 /*
 427 ================
 428 Mod_Precache
 429 ================
 430 */
 431 static void Mod_Precache(void)
 432 {
 433         if (Cmd_Argc() == 2)
 434                 Mod_ForName(Cmd_Argv(1), false, true, cl.worldmodel && !strcasecmp(Cmd_Argv(1), cl.worldmodel->name));
 435         else
 436                 Con_Printf("usage: modelprecache <filename>\n");
 437 }
 438
 439 int Mod_FindTriangleWithEdge(const int *elements, int numtriangles, int start, int end, int ignore)
 440 {
 441         int i, match, count;
 442         count = 0;
 443         match = -1;
 444         for (i = 0;i < numtriangles;i++, elements += 3)
 445         {
 446                      if ((elements[0] == start && elements[1] == end)
 447                       || (elements[1] == start && elements[2] == end)
 448                       || (elements[2] == start && elements[0] == end))
 449                 {
 450                         if (i != ignore)
 451                                 match = i;
 452                         count++;
 453                 }
 454                 else if ((elements[1] == start && elements[0] == end)
 455                       || (elements[2] == start && elements[1] == end)
 456                       || (elements[0] == start && elements[2] == end))
 457                         count++;
 458         }
 459         // detect edges shared by three triangles and make them seams
 460         if (count > 2)
 461                 match = -1;
 462         return match;
 463 }
 464
 465 void Mod_BuildTriangleNeighbors(int *neighbors, const int *elements, int numtriangles)
 466 {
 467         int i, *n;
 468         const int *e;
 469         for (i = 0, e = elements, n = neighbors;i < numtriangles;i++, e += 3, n += 3)
 470         {
 471                 n[0] = Mod_FindTriangleWithEdge(elements, numtriangles, e[1], e[0], i);
 472                 n[1] = Mod_FindTriangleWithEdge(elements, numtriangles, e[2], e[1], i);
 473                 n[2] = Mod_FindTriangleWithEdge(elements, numtriangles, e[0], e[2], i);
 474         }
 475 }
 476
 477 void Mod_ValidateElements(const int *elements, int numtriangles, int numverts, const char *filename, int fileline)
 478 {
 479         int i;
 480         for (i = 0;i < numtriangles * 3;i++)
 481                 if ((unsigned int)elements[i] >= (unsigned int)numverts)
 482                         Con_Printf("Mod_ValidateElements: out of bounds element detected at %s:%d\n", filename, fileline);
 483 }
 484
 485 void Mod_BuildBumpVectors(const float *v0, const float *v1, const float *v2, const float *tc0, const float *tc1, const float *tc2, float *svector3f, float *tvector3f, float *normal3f)
 486 {
 487         float f;
 488         normal3f[0] = (v1[1] - v0[1]) * (v2[2] - v0[2]) - (v1[2] - v0[2]) * (v2[1] - v0[1]);
 489         normal3f[1] = (v1[2] - v0[2]) * (v2[0] - v0[0]) - (v1[0] - v0[0]) * (v2[2] - v0[2]);
 490         normal3f[2] = (v1[0] - v0[0]) * (v2[1] - v0[1]) - (v1[1] - v0[1]) * (v2[0] - v0[0]);
 491         VectorNormalize(normal3f);
 492         tvector3f[0] = ((tc1[0] - tc0[0]) * (v2[0] - v0[0]) - (tc2[0] - tc0[0]) * (v1[0] - v0[0]));
 493         tvector3f[1] = ((tc1[0] - tc0[0]) * (v2[1] - v0[1]) - (tc2[0] - tc0[0]) * (v1[1] - v0[1]));
 494         tvector3f[2] = ((tc1[0] - tc0[0]) * (v2[2] - v0[2]) - (tc2[0] - tc0[0]) * (v1[2] - v0[2]));
 495         f = -DotProduct(tvector3f, normal3f);
 496         VectorMA(tvector3f, f, normal3f, tvector3f);
 497         VectorNormalize(tvector3f);
 498         CrossProduct(normal3f, tvector3f, svector3f);
 499 }
 500
 501 // warning: this is an expensive function!
 502 void Mod_BuildTextureVectorsAndNormals(int numverts, int numtriangles, const float *vertex3f, const float *texcoord2f, const int *elements, float *svector3f, float *tvector3f, float *normal3f)
 503 {
 504         int i, tnum;
 505         float sdir[3], tdir[3], normal[3], *v;
 506         const int *e;
 507         // clear the vectors
 508         if (svector3f)
 509                 memset(svector3f, 0, numverts * sizeof(float[3]));
 510         if (tvector3f)
 511                 memset(tvector3f, 0, numverts * sizeof(float[3]));
 512         if (normal3f)
 513                 memset(normal3f, 0, numverts * sizeof(float[3]));
 514         // process each vertex of each triangle and accumulate the results
 515         for (tnum = 0, e = elements;tnum < numtriangles;tnum++, e += 3)
 516         {
 517                 Mod_BuildBumpVectors(vertex3f + e[0] * 3, vertex3f + e[1] * 3, vertex3f + e[2] * 3, texcoord2f + e[0] * 2, texcoord2f + e[1] * 2, texcoord2f + e[2] * 2, sdir, tdir, normal);
 518                 if (svector3f)
 519                 {
 520                         for (i = 0;i < 3;i++)
 521                         {
 522                                 svector3f[e[i]*3  ] += sdir[0];
 523                                 svector3f[e[i]*3+1] += sdir[1];
 524                                 svector3f[e[i]*3+2] += sdir[2];
 525                         }
 526                 }
 527                 if (tvector3f)
 528                 {
 529                         for (i = 0;i < 3;i++)
 530                         {
 531                                 tvector3f[e[i]*3  ] += tdir[0];
 532                                 tvector3f[e[i]*3+1] += tdir[1];
 533                                 tvector3f[e[i]*3+2] += tdir[2];
 534                         }
 535                 }
 536                 if (normal3f)
 537                 {
 538                         for (i = 0;i < 3;i++)
 539                         {
 540                                 normal3f[e[i]*3  ] += normal[0];
 541                                 normal3f[e[i]*3+1] += normal[1];
 542                                 normal3f[e[i]*3+2] += normal[2];
 543                         }
 544                 }
 545         }
 546         // now we could divide the vectors by the number of averaged values on
 547         // each vertex...  but instead normalize them
 548         // 4 assignments, 1 divide, 1 sqrt, 2 adds, 6 multiplies
 549         if (svector3f)
 550                 for (i = 0, v = svector3f;i < numverts;i++, v += 3)
 551                         VectorNormalize(v);
 552         // 4 assignments, 1 divide, 1 sqrt, 2 adds, 6 multiplies
 553         if (tvector3f)
 554                 for (i = 0, v = tvector3f;i < numverts;i++, v += 3)
 555                         VectorNormalize(v);
 556         // 4 assignments, 1 divide, 1 sqrt, 2 adds, 6 multiplies
 557         if (normal3f)
 558                 for (i = 0, v = normal3f;i < numverts;i++, v += 3)
 559                         VectorNormalize(v);
 560 }
 561
 562 shadowmesh_t *Mod_ShadowMesh_Alloc(mempool_t *mempool, int maxverts)
 563 {
 564         shadowmesh_t *mesh;
 565         mesh = Mem_Alloc(mempool, sizeof(shadowmesh_t) + maxverts * sizeof(float[3]) + maxverts * sizeof(int[3]) + maxverts * sizeof(int[3]) + SHADOWMESHVERTEXHASH * sizeof(shadowmeshvertexhash_t *) + maxverts * sizeof(shadowmeshvertexhash_t));
 566         mesh->maxverts = maxverts;
 567         mesh->maxtriangles = maxverts;
 568         mesh->numverts = 0;
 569         mesh->numtriangles = 0;
 570         mesh->vertex3f = (float *)(mesh + 1);
 571         mesh->element3i = (int *)(mesh->vertex3f + mesh->maxverts * 3);
 572         mesh->neighbor3i = (int *)(mesh->element3i + mesh->maxtriangles * 3);
 573         mesh->vertexhashtable = (shadowmeshvertexhash_t **)(mesh->neighbor3i + mesh->maxtriangles * 3);
 574         mesh->vertexhashentries = (shadowmeshvertexhash_t *)(mesh->vertexhashtable + SHADOWMESHVERTEXHASH);
 575         return mesh;
 576 }
 577
 578 shadowmesh_t *Mod_ShadowMesh_ReAlloc(mempool_t *mempool, shadowmesh_t *oldmesh)
 579 {
 580         shadowmesh_t *newmesh;
 581         newmesh = Mem_Alloc(mempool, sizeof(shadowmesh_t) + oldmesh->numverts * sizeof(float[3]) + oldmesh->numtriangles * sizeof(int[3]) + oldmesh->numtriangles * sizeof(int[3]));
 582         newmesh->maxverts = newmesh->numverts = oldmesh->numverts;
 583         newmesh->maxtriangles = newmesh->numtriangles = oldmesh->numtriangles;
 584         newmesh->vertex3f = (float *)(newmesh + 1);
 585         newmesh->element3i = (int *)(newmesh->vertex3f + newmesh->maxverts * 3);
 586         newmesh->neighbor3i = (int *)(newmesh->element3i + newmesh->maxtriangles * 3);
 587         memcpy(newmesh->vertex3f, oldmesh->vertex3f, newmesh->numverts * sizeof(float[3]));
 588         memcpy(newmesh->element3i, oldmesh->element3i, newmesh->numtriangles * sizeof(int[3]));
 589         memcpy(newmesh->neighbor3i, oldmesh->neighbor3i, newmesh->numtriangles * sizeof(int[3]));
 590         return newmesh;
 591 }
 592
 593 int Mod_ShadowMesh_AddVertex(shadowmesh_t *mesh, float *v)
 594 {
 595         int hashindex;
 596         float *m;
 597         shadowmeshvertexhash_t *hash;
 598         // this uses prime numbers intentionally
 599         hashindex = (int) (v[0] * 3 + v[1] * 5 + v[2] * 7) % SHADOWMESHVERTEXHASH;
 600         for (hash = mesh->vertexhashtable[hashindex];hash;hash = hash->next)
 601         {
 602                 m = mesh->vertex3f + (hash - mesh->vertexhashentries) * 3;
 603                 if (m[0] == v[0] && m[1] == v[1] &&  m[2] == v[2])
 604                         return hash - mesh->vertexhashentries;
 605         }
 606         hash = mesh->vertexhashentries + mesh->numverts;
 607         hash->next = mesh->vertexhashtable[hashindex];
 608         mesh->vertexhashtable[hashindex] = hash;
 609         m = mesh->vertex3f + (hash - mesh->vertexhashentries) * 3;
 610         VectorCopy(v, m);
 611         mesh->numverts++;
 612         return mesh->numverts - 1;
 613 }
 614
 615 void Mod_ShadowMesh_AddTriangle(mempool_t *mempool, shadowmesh_t *mesh, float *vert0, float *vert1, float *vert2)
 616 {
 617         while (mesh->numverts + 3 > mesh->maxverts || mesh->numtriangles + 1 > mesh->maxtriangles)
 618         {
 619                 if (mesh->next == NULL)
 620                         mesh->next = Mod_ShadowMesh_Alloc(mempool, max(mesh->maxtriangles, 1));
 621                 mesh = mesh->next;
 622         }
 623         mesh->element3i[mesh->numtriangles * 3 + 0] = Mod_ShadowMesh_AddVertex(mesh, vert0);
 624         mesh->element3i[mesh->numtriangles * 3 + 1] = Mod_ShadowMesh_AddVertex(mesh, vert1);
 625         mesh->element3i[mesh->numtriangles * 3 + 2] = Mod_ShadowMesh_AddVertex(mesh, vert2);
 626         mesh->numtriangles++;
 627 }
 628
 629 void Mod_ShadowMesh_AddPolygon(mempool_t *mempool, shadowmesh_t *mesh, int numverts, float *verts)
 630 {
 631         int i;
 632         float *v;
 633         for (i = 0, v = verts + 3;i < numverts - 2;i++, v += 3)
 634                 Mod_ShadowMesh_AddTriangle(mempool, mesh, verts, v, v + 3);
 635         /*
 636         int i, i1, i2, i3;
 637         float *v;
 638         while (mesh->numverts + numverts > mesh->maxverts || mesh->numtriangles + (numverts - 2) > mesh->maxtriangles)
 639         {
 640                 if (mesh->next == NULL)
 641                         mesh->next = Mod_ShadowMesh_Alloc(mempool, max(mesh->maxtriangles, numverts));
 642                 mesh = mesh->next;
 643         }
 644         i1 = Mod_ShadowMesh_AddVertex(mesh, verts);
 645         i2 = 0;
 646         i3 = Mod_ShadowMesh_AddVertex(mesh, verts + 3);
 647         for (i = 0, v = verts + 6;i < numverts - 2;i++, v += 3)
 648         {
 649                 i2 = i3;
 650                 i3 = Mod_ShadowMesh_AddVertex(mesh, v);
 651                 mesh->elements[mesh->numtriangles * 3 + 0] = i1;
 652                 mesh->elements[mesh->numtriangles * 3 + 1] = i2;
 653                 mesh->elements[mesh->numtriangles * 3 + 2] = i3;
 654                 mesh->numtriangles++;
 655         }
 656         */
 657 }
 658
 659 void Mod_ShadowMesh_AddMesh(mempool_t *mempool, shadowmesh_t *mesh, float *verts, int numtris, int *elements)
 660 {
 661         int i;
 662         for (i = 0;i < numtris;i++, elements += 3)
 663                 Mod_ShadowMesh_AddTriangle(mempool, mesh, verts + elements[0] * 3, verts + elements[1] * 3, verts + elements[2] * 3);
 664 }
 665
 666 shadowmesh_t *Mod_ShadowMesh_Begin(mempool_t *mempool, int initialnumtriangles)
 667 {
 668         return Mod_ShadowMesh_Alloc(mempool, initialnumtriangles);
 669 }
 670
 671 shadowmesh_t *Mod_ShadowMesh_Finish(mempool_t *mempool, shadowmesh_t *firstmesh)
 672 {
 673 #if 1
 674         //int i;
 675         shadowmesh_t *mesh, *newmesh, *nextmesh;
 676         // reallocate meshs to conserve space
 677         for (mesh = firstmesh, firstmesh = NULL;mesh;mesh = nextmesh)
 678         {
 679                 nextmesh = mesh->next;
 680                 if (mesh->numverts >= 3 && mesh->numtriangles >= 1)
 681                 {
 682                         newmesh = Mod_ShadowMesh_ReAlloc(mempool, mesh);
 683                         newmesh->next = firstmesh;
 684                         firstmesh = newmesh;
 685                         //Con_Printf("mesh\n");
 686                         //for (i = 0;i < newmesh->numtriangles;i++)
 687                         //      Con_Printf("tri %d %d %d\n", newmesh->elements[i * 3 + 0], newmesh->elements[i * 3 + 1], newmesh->elements[i * 3 + 2]);
 688                         Mod_ValidateElements(newmesh->element3i, newmesh->numtriangles, newmesh->numverts, __FILE__, __LINE__);
 689                         Mod_BuildTriangleNeighbors(newmesh->neighbor3i, newmesh->element3i, newmesh->numtriangles);
 690                 }
 691                 Mem_Free(mesh);
 692         }
 693 #else
 694         shadowmesh_t *mesh;
 695         for (mesh = firstmesh;mesh;mesh = mesh->next)
 696         {
 697                 Mod_ValidateElements(mesh->elements, mesh->numtriangles, mesh->numverts, __FILE__, __LINE__);
 698                 Mod_BuildTriangleNeighbors(mesh->neighbors, mesh->elements, mesh->numtriangles);
 699         }
 700 #endif
 701         return firstmesh;
 702 }
 703
 704 void Mod_ShadowMesh_CalcBBox(shadowmesh_t *firstmesh, vec3_t mins, vec3_t maxs, vec3_t center, float *radius)
 705 {
 706         int i;
 707         shadowmesh_t *mesh;
 708         vec3_t nmins, nmaxs, ncenter, temp;
 709         float nradius2, dist2, *v;
 710         // calculate bbox
 711         for (mesh = firstmesh;mesh;mesh = mesh->next)
 712         {
 713                 if (mesh == firstmesh)
 714                 {
 715                         VectorCopy(mesh->vertex3f, nmins);
 716                         VectorCopy(mesh->vertex3f, nmaxs);
 717                 }
 718                 for (i = 0, v = mesh->vertex3f;i < mesh->numverts;i++, v += 3)
 719                 {
 720                         if (nmins[0] > v[0]) nmins[0] = v[0];if (nmaxs[0] < v[0]) nmaxs[0] = v[0];
 721                         if (nmins[1] > v[1]) nmins[1] = v[1];if (nmaxs[1] < v[1]) nmaxs[1] = v[1];
 722                         if (nmins[2] > v[2]) nmins[2] = v[2];if (nmaxs[2] < v[2]) nmaxs[2] = v[2];
 723                 }
 724         }
 725         // calculate center and radius
 726         ncenter[0] = (nmins[0] + nmaxs[0]) * 0.5f;
 727         ncenter[1] = (nmins[1] + nmaxs[1]) * 0.5f;
 728         ncenter[2] = (nmins[2] + nmaxs[2]) * 0.5f;
 729         nradius2 = 0;
 730         for (mesh = firstmesh;mesh;mesh = mesh->next)
 731         {
 732                 for (i = 0, v = mesh->vertex3f;i < mesh->numverts;i++, v += 3)
 733                 {
 734                         VectorSubtract(v, ncenter, temp);
 735                         dist2 = DotProduct(temp, temp);
 736                         if (nradius2 < dist2)
 737                                 nradius2 = dist2;
 738                 }
 739         }
 740         // return data
 741         if (mins)
 742                 VectorCopy(nmins, mins);
 743         if (maxs)
 744                 VectorCopy(nmaxs, maxs);
 745         if (center)
 746                 VectorCopy(ncenter, center);
 747         if (radius)
 748                 *radius = sqrt(nradius2);
 749 }
 750
 751 void Mod_ShadowMesh_Free(shadowmesh_t *mesh)
 752 {
 753         shadowmesh_t *nextmesh;
 754         for (;mesh;mesh = nextmesh)
 755         {
 756                 nextmesh = mesh->next;
 757                 Mem_Free(mesh);
 758         }
 759 }
 760
 761 static rtexture_t *GL_TextureForSkinLayer(const qbyte *in, int width, int height, const char *name, const unsigned int *palette, int textureflags)
 762 {
 763         int i;
 764         for (i = 0;i < width*height;i++)
 765                 if (((qbyte *)&palette[in[i]])[3] > 0)
 766                         return R_LoadTexture2D (loadmodel->texturepool, name, width, height, in, TEXTYPE_PALETTE, textureflags, palette);
 767         return NULL;
 768 }
 769
 770 static int detailtexturecycle = 0;
 771 int Mod_LoadSkinFrame(skinframe_t *skinframe, char *basename, int textureflags, int loadpantsandshirt, int usedetailtexture, int loadglowtexture)
 772 {
 773         imageskin_t s;
 774         memset(skinframe, 0, sizeof(*skinframe));
 775         if (!image_loadskin(&s, basename))
 776                 return false;
 777         if (usedetailtexture)
 778                 skinframe->detail = mod_shared_detailtextures[(detailtexturecycle++) % NUM_DETAILTEXTURES];
 779         skinframe->base = R_LoadTexture2D (loadmodel->texturepool, basename, s.basepixels_width, s.basepixels_height, s.basepixels, TEXTYPE_RGBA, textureflags, NULL);
 780         if (s.nmappixels != NULL)
 781                 skinframe->nmap = R_LoadTexture2D (loadmodel->texturepool, va("%s_nmap", basename), s.nmappixels_width, s.nmappixels_height, s.nmappixels, TEXTYPE_RGBA, textureflags, NULL);
 782         if (s.glosspixels != NULL)
 783                 skinframe->gloss = R_LoadTexture2D (loadmodel->texturepool, va("%s_gloss", basename), s.glosspixels_width, s.glosspixels_height, s.glosspixels, TEXTYPE_RGBA, textureflags, NULL);
 784         if (s.glowpixels != NULL && loadglowtexture)
 785                 skinframe->glow = R_LoadTexture2D (loadmodel->texturepool, va("%s_glow", basename), s.glowpixels_width, s.glowpixels_height, s.glowpixels, TEXTYPE_RGBA, textureflags, NULL);
 786         if (s.maskpixels != NULL)
 787                 skinframe->fog = R_LoadTexture2D (loadmodel->texturepool, va("%s_mask", basename), s.maskpixels_width, s.maskpixels_height, s.maskpixels, TEXTYPE_RGBA, textureflags, NULL);
 788         if (loadpantsandshirt)
 789         {
 790                 if (s.pantspixels != NULL)
 791                         skinframe->pants = R_LoadTexture2D (loadmodel->texturepool, va("%s_pants", basename), s.pantspixels_width, s.pantspixels_height, s.pantspixels, TEXTYPE_RGBA, textureflags, NULL);
 792                 if (s.shirtpixels != NULL)
 793                         skinframe->shirt = R_LoadTexture2D (loadmodel->texturepool, va("%s_shirt", basename), s.shirtpixels_width, s.shirtpixels_height, s.shirtpixels, TEXTYPE_RGBA, textureflags, NULL);
 794         }
 795         image_freeskin(&s);
 796         return true;
 797 }
 798
 799 int Mod_LoadSkinFrame_Internal(skinframe_t *skinframe, char *basename, int textureflags, int loadpantsandshirt, int usedetailtexture, int loadglowtexture, qbyte *skindata, int width, int height)
 800 {
 801         qbyte *temp1, *temp2;
 802         memset(skinframe, 0, sizeof(*skinframe));
 803         if (!skindata)
 804                 return false;
 805         if (usedetailtexture)
 806                 skinframe->detail = mod_shared_detailtextures[(detailtexturecycle++) % NUM_DETAILTEXTURES];
 807         if (r_shadow_bumpscale_basetexture.value > 0)
 808         {
 809                 temp1 = Mem_Alloc(loadmodel->mempool, width * height * 8);
 810                 temp2 = temp1 + width * height * 4;
 811                 Image_Copy8bitRGBA(skindata, temp1, width * height, palette_nofullbrights);
 812                 Image_HeightmapToNormalmap(temp1, temp2, width, height, false, r_shadow_bumpscale_basetexture.value);
 813                 skinframe->nmap = R_LoadTexture2D(loadmodel->texturepool, va("%s_nmap", basename), width, height, temp2, TEXTYPE_RGBA, textureflags, NULL);
 814                 Mem_Free(temp1);
 815         }
 816         if (loadglowtexture)
 817         {
 818                 skinframe->glow = GL_TextureForSkinLayer(skindata, width, height, va("%s_glow", basename), palette_onlyfullbrights, textureflags); // glow
 819                 skinframe->base = skinframe->merged = GL_TextureForSkinLayer(skindata, width, height, va("%s_merged", basename), palette_nofullbrights, textureflags); // all but fullbrights
 820                 if (loadpantsandshirt)
 821                 {
 822                         skinframe->pants = GL_TextureForSkinLayer(skindata, width, height, va("%s_pants", basename), palette_pantsaswhite, textureflags); // pants
 823                         skinframe->shirt = GL_TextureForSkinLayer(skindata, width, height, va("%s_shirt", basename), palette_shirtaswhite, textureflags); // shirt
 824                         if (skinframe->pants || skinframe->shirt)
 825                                 skinframe->base = GL_TextureForSkinLayer(skindata, width, height, va("%s_nospecial", basename), palette_nocolormapnofullbrights, textureflags); // no special colors
 826                 }
 827         }
 828         else
 829         {
 830                 skinframe->base = skinframe->merged = GL_TextureForSkinLayer(skindata, width, height, va("%s_merged", basename), palette_complete, textureflags); // all
 831                 if (loadpantsandshirt)
 832                 {
 833                         skinframe->pants = GL_TextureForSkinLayer(skindata, width, height, va("%s_pants", basename), palette_pantsaswhite, textureflags); // pants
 834                         skinframe->shirt = GL_TextureForSkinLayer(skindata, width, height, va("%s_shirt", basename), palette_shirtaswhite, textureflags); // shirt
 835                         if (skinframe->pants || skinframe->shirt)
 836                                 skinframe->base = GL_TextureForSkinLayer(skindata, width, height, va("%s_nospecial", basename), palette_nocolormap, textureflags); // no pants or shirt
 837                 }
 838         }
 839         return true;
 840 }
 841
 842 void Mod_GetTerrainVertex3fTexCoord2fFromRGBA(const qbyte *imagepixels, int imagewidth, int imageheight, int ix, int iy, float *vertex3f, float *texcoord2f, matrix4x4_t *pixelstepmatrix, matrix4x4_t *pixeltexturestepmatrix)
 843 {
 844         float v[3], tc[3];
 845         v[0] = ix;
 846         v[1] = iy;
 847         if (ix >= 0 && iy >= 0 && ix < imagewidth && iy < imageheight)
 848                 v[2] = (imagepixels[((iy*imagewidth)+ix)*4+0] + imagepixels[((iy*imagewidth)+ix)*4+1] + imagepixels[((iy*imagewidth)+ix)*4+2]) * (1.0f / 765.0f);
 849         else
 850                 v[2] = 0;
 851         Matrix4x4_Transform(pixelstepmatrix, v, vertex3f);
 852         Matrix4x4_Transform(pixeltexturestepmatrix, v, tc);
 853         texcoord2f[0] = tc[0];
 854         texcoord2f[1] = tc[1];
 855 }
 856
 857 void Mod_GetTerrainVertexFromRGBA(const qbyte *imagepixels, int imagewidth, int imageheight, int ix, int iy, float *vertex3f, float *svector3f, float *tvector3f, float *normal3f, float *texcoord2f, matrix4x4_t *pixelstepmatrix, matrix4x4_t *pixeltexturestepmatrix)
 858 {
 859         float vup[3], vdown[3], vleft[3], vright[3];
 860         float tcup[3], tcdown[3], tcleft[3], tcright[3];
 861         float sv[3], tv[3], nl[3];
 862         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix, iy, vertex3f, texcoord2f, pixelstepmatrix, pixeltexturestepmatrix);
 863         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix, iy - 1, vup, tcup, pixelstepmatrix, pixeltexturestepmatrix);
 864         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix, iy + 1, vdown, tcdown, pixelstepmatrix, pixeltexturestepmatrix);
 865         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix - 1, iy, vleft, tcleft, pixelstepmatrix, pixeltexturestepmatrix);
 866         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix + 1, iy, vright, tcright, pixelstepmatrix, pixeltexturestepmatrix);
 867         Mod_BuildBumpVectors(vertex3f, vup, vright, texcoord2f, tcup, tcright, svector3f, tvector3f, normal3f);
 868         Mod_BuildBumpVectors(vertex3f, vright, vdown, texcoord2f, tcright, tcdown, sv, tv, nl);
 869         VectorAdd(svector3f, sv, svector3f);
 870         VectorAdd(tvector3f, tv, tvector3f);
 871         VectorAdd(normal3f, nl, normal3f);
 872         Mod_BuildBumpVectors(vertex3f, vdown, vleft, texcoord2f, tcdown, tcleft, sv, tv, nl);
 873         VectorAdd(svector3f, sv, svector3f);
 874         VectorAdd(tvector3f, tv, tvector3f);
 875         VectorAdd(normal3f, nl, normal3f);
 876         Mod_BuildBumpVectors(vertex3f, vleft, vup, texcoord2f, tcleft, tcup, sv, tv, nl);
 877         VectorAdd(svector3f, sv, svector3f);
 878         VectorAdd(tvector3f, tv, tvector3f);
 879         VectorAdd(normal3f, nl, normal3f);
 880 }
 881
 882 void Mod_ConstructTerrainPatchFromRGBA(const qbyte *imagepixels, int imagewidth, int imageheight, int x1, int y1, int width, int height, int *element3i, int *neighbor3i, float *vertex3f, float *svector3f, float *tvector3f, float *normal3f, float *texcoord2f, matrix4x4_t *pixelstepmatrix, matrix4x4_t *pixeltexturestepmatrix)
 883 {
 884         int x, y, ix, iy, *e;
 885         e = element3i;
 886         for (y = 0;y < height;y++)
 887         {
 888                 for (x = 0;x < width;x++)
 889                 {
 890                         e[0] = (y + 1) * (width + 1) + (x + 0);
 891                         e[1] = (y + 0) * (width + 1) + (x + 0);
 892                         e[2] = (y + 1) * (width + 1) + (x + 1);
 893                         e[3] = (y + 0) * (width + 1) + (x + 0);
 894                         e[4] = (y + 0) * (width + 1) + (x + 1);
 895                         e[5] = (y + 1) * (width + 1) + (x + 1);
 896                         e += 6;
 897                 }
 898         }
 899         Mod_BuildTriangleNeighbors(neighbor3i, element3i, width*height*2);
 900         for (y = 0, iy = y1;y < height + 1;y++, iy++)
 901                 for (x = 0, ix = x1;x < width + 1;x++, ix++, vertex3f += 3, texcoord2f += 2, svector3f += 3, tvector3f += 3, normal3f += 3)
 902                         Mod_GetTerrainVertexFromRGBA(imagepixels, imagewidth, imageheight, ix, iy, vertex3f, texcoord2f, svector3f, tvector3f, normal3f, pixelstepmatrix, pixeltexturestepmatrix);
 903 }
 904
 905 skinfile_t *Mod_LoadSkinFiles(void)
 906 {
 907         int i, words, numtags, line, tagsetsused = false, wordsoverflow;
 908         char *text;
 909         const char *data;
 910         skinfile_t *skinfile, *first = NULL;
 911         skinfileitem_t *skinfileitem;
 912         char word[10][MAX_QPATH];
 913         overridetagnameset_t tagsets[MAX_SKINS];
 914         overridetagname_t tags[256];
 915
 916 /*
 917 sample file:
 918 U_bodyBox,models/players/Legoman/BikerA2.tga
 919 U_RArm,models/players/Legoman/BikerA1.tga
 920 U_LArm,models/players/Legoman/BikerA1.tga
 921 U_armor,common/nodraw
 922 U_sword,common/nodraw
 923 U_shield,common/nodraw
 924 U_homb,common/nodraw
 925 U_backpack,common/nodraw
 926 U_colcha,common/nodraw
 927 tag_head,
 928 tag_weapon,
 929 tag_torso,
 930 */
 931         memset(tagsets, 0, sizeof(tagsets));
 932         memset(word, 0, sizeof(word));
 933         for (i = 0;i < MAX_SKINS && (data = text = FS_LoadFile(va("%s_%i.skin", loadmodel->name, i), true));i++)
 934         {
 935                 numtags = 0;
 936                 skinfile = Mem_Alloc(tempmempool, sizeof(skinfile_t));
 937                 skinfile->next = first;
 938                 first = skinfile;
 939                 for(line = 0;;line++)
 940                 {
 941                         // parse line
 942                         if (!COM_ParseToken(&data, true))
 943                                 break;
 944                         if (!strcmp(com_token, "\n"))
 945                                 continue;
 946                         words = 0;
 947                         wordsoverflow = false;
 948                         do
 949                         {
 950                                 if (words < 10)
 951                                         strncpy(word[words++], com_token, MAX_QPATH - 1);
 952                                 else
 953                                         wordsoverflow = true;
 954                         }
 955                         while (COM_ParseToken(&data, true) && strcmp(com_token, "\n"));
 956                         if (wordsoverflow)
 957                         {
 958                                 Con_Printf("Mod_LoadSkinFiles: parsing error in file \"%s_%i.skin\" on line #%i: line with too many statements, skipping\n", loadmodel->name, i, line);
 959                                 continue;
 960                         }
 961                         // words is always >= 1
 962                         if (!strcmp(word[0], "replace"))
 963                         {
 964                                 if (words == 3)
 965                                 {
 966                                         Con_DPrintf("Mod_LoadSkinFiles: parsed mesh \"%s\" shader replacement \"%s\"\n", word[1], word[2]);
 967                                         skinfileitem = Mem_Alloc(tempmempool, sizeof(skinfileitem_t));
 968                                         skinfileitem->next = skinfile->items;
 969                                         skinfile->items = skinfileitem;
 970                                         strncpy(skinfileitem->name, word[1], sizeof(skinfileitem->name) - 1);
 971                                         strncpy(skinfileitem->replacement, word[2], sizeof(skinfileitem->replacement) - 1);
 972                                 }
 973                                 else
 974                                         Con_Printf("Mod_LoadSkinFiles: parsing error in file \"%s_%i.skin\" on line #%i: wrong number of parameters to command \"%s\", see documentation in DP_GFX_SKINFILES extension in dpextensions.qc\n", loadmodel->name, i, line, word[0]);
 975                         }
 976                         else if (words == 2 && !strcmp(word[1], ","))
 977                         {
 978                                 // tag name, like "tag_weapon,"
 979                                 Con_DPrintf("Mod_LoadSkinFiles: parsed tag #%i \"%s\"\n", numtags, word[0]);
 980                                 memset(tags + numtags, 0, sizeof(tags[numtags]));
 981                                 strncpy(tags[numtags].name, word[0], sizeof(tags[numtags].name) - 1);
 982                                 numtags++;
 983                         }
 984                         else if (words == 3 && !strcmp(word[1], ","))
 985                         {
 986                                 // mesh shader name, like "U_RArm,models/players/Legoman/BikerA1.tga"
 987                                 Con_DPrintf("Mod_LoadSkinFiles: parsed mesh \"%s\" shader replacement \"%s\"\n", word[0], word[2]);
 988                                 skinfileitem = Mem_Alloc(tempmempool, sizeof(skinfileitem_t));
 989                                 skinfileitem->next = skinfile->items;
 990                                 skinfile->items = skinfileitem;
 991                                 strncpy(skinfileitem->name, word[0], sizeof(skinfileitem->name) - 1);
 992                                 strncpy(skinfileitem->replacement, word[2], sizeof(skinfileitem->replacement) - 1);
 993                         }
 994                         else
 995                                 Con_Printf("Mod_LoadSkinFiles: parsing error in file \"%s_%i.skin\" on line #%i: does not look like tag or mesh specification, or replace command, see documentation in DP_GFX_SKINFILES extension in dpextensions.qc\n", loadmodel->name, i, line);
 996                 }
 997                 Mem_Free(text);
 998
 999                 if (numtags)
1000                 {
1001                         overridetagnameset_t *t;
1002                         t = tagsets + i;
1003                         t->num_overridetagnames = numtags;
1004                         t->data_overridetagnames = Mem_Alloc(loadmodel->mempool, t->num_overridetagnames * sizeof(overridetagname_t));
1005                         memcpy(t->data_overridetagnames, tags, t->num_overridetagnames * sizeof(overridetagname_t));
1006                         tagsetsused = true;
1007                 }
1008         }
1009         if (tagsetsused)
1010         {
1011                 loadmodel->data_overridetagnamesforskin = Mem_Alloc(loadmodel->mempool, i * sizeof(overridetagnameset_t));
1012                 memcpy(loadmodel->data_overridetagnamesforskin, tagsets, i * sizeof(overridetagnameset_t));
1013         }
1014         if (i)
1015                 loadmodel->numskins = i;
1016         return first;
1017 }
1018
1019 void Mod_FreeSkinFiles(skinfile_t *skinfile)
1020 {
1021         skinfile_t *next;
1022         skinfileitem_t *skinfileitem, *nextitem;
1023         for (;skinfile;skinfile = next)
1024         {
1025                 next = skinfile->next;
1026                 for (skinfileitem = skinfile->items;skinfileitem;skinfileitem = nextitem)
1027                 {
1028                         nextitem = skinfileitem->next;
1029                         Mem_Free(skinfileitem);
1030                 }
1031                 Mem_Free(skinfile);
1032         }
1033 }
1034
1035 int Mod_CountSkinFiles(skinfile_t *skinfile)
1036 {
1037         int i;
1038         for (i = 0;skinfile;skinfile = skinfile->next, i++);
1039         return i;
1040 }
1041
1042 int Mod_RemoveDegenerateTriangles(int numtriangles, const int *inelement3i, int *outelement3i, const float *vertex3f)
1043 {
1044         int i, outtriangles;
1045         float d, edgedir[3], temp[3];
1046         // a degenerate triangle is one with no width (thickness, surface area)
1047         // these are characterized by having all 3 points colinear (along a line)
1048         // or having two points identical
1049         for (i = 0, outtriangles = 0;i < numtriangles;i++, inelement3i += 3)
1050         {
1051                 // calculate first edge
1052                 VectorSubtract(vertex3f + inelement3i[1] * 3, vertex3f + inelement3i[0] * 3, edgedir);
1053                 if (VectorLength2(edgedir) < 0.0001f)
1054                         continue; // degenerate first edge (no length)
1055                 VectorNormalize(edgedir);
1056                 // check if third point is on the edge (colinear)
1057                 d = -DotProduct(vertex3f + inelement3i[2] * 3, edgedir);
1058                 VectorMA(vertex3f + inelement3i[2] * 3, d, edgedir, temp);
1059                 if (VectorLength2(temp) < 0.0001f)
1060                         continue; // third point colinear with first edge
1061                 // valid triangle (no colinear points, no duplicate points)
1062                 VectorCopy(inelement3i, outelement3i);
1063                 outelement3i += 3;
1064                 outtriangles++;
1065         }
1066         return outtriangles;
1067 }
1068