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: was 512
  34 #define MAX_MOD_KNOWN (MAX_MODELS + 256)
  35 static model_t mod_known[MAX_MOD_KNOWN];
  36
  37 static void mod_start(void)
  38 {
  39         int i;
  40         for (i = 0;i < MAX_MOD_KNOWN;i++)
  41                 if (mod_known[i].name[0])
  42                         Mod_UnloadModel(&mod_known[i]);
  43         Mod_LoadModels();
  44 }
  45
  46 static void mod_shutdown(void)
  47 {
  48         int i;
  49         for (i = 0;i < MAX_MOD_KNOWN;i++)
  50                 if (mod_known[i].name[0])
  51                         Mod_UnloadModel(&mod_known[i]);
  52 }
  53
  54 static void mod_newmap(void)
  55 {
  56         msurface_t *surface;
  57         int i, surfacenum, ssize, tsize;
  58
  59         if (!cl_stainmaps_clearonload.integer)
  60                 return;
  61
  62         for (i = 0;i < MAX_MOD_KNOWN;i++)
  63         {
  64                 if (mod_known[i].name[0])
  65                 {
  66                         for (surfacenum = 0, surface = mod_known[i].data_surfaces;surfacenum < mod_known[i].num_surfaces;surfacenum++, surface++)
  67                         {
  68                                 if (surface->lightmapinfo && surface->lightmapinfo->stainsamples)
  69                                 {
  70                                         ssize = (surface->lightmapinfo->extents[0] >> 4) + 1;
  71                                         tsize = (surface->lightmapinfo->extents[1] >> 4) + 1;
  72                                         memset(surface->lightmapinfo->stainsamples, 255, ssize * tsize * 3);
  73                                         surface->cached_dlight = true;
  74                                 }
  75                         }
  76                 }
  77         }
  78 }
  79
  80 /*
  81 ===============
  82 Mod_Init
  83 ===============
  84 */
  85 static void Mod_Print(void);
  86 static void Mod_Precache (void);
  87 void Mod_Init (void)
  88 {
  89         Mod_BrushInit();
  90         Mod_AliasInit();
  91         Mod_SpriteInit();
  92
  93         Cvar_RegisterVariable(&r_mipskins);
  94         Cmd_AddCommand ("modellist", Mod_Print);
  95         Cmd_AddCommand ("modelprecache", Mod_Precache);
  96 }
  97
  98 void Mod_RenderInit(void)
  99 {
 100         R_RegisterModule("Models", mod_start, mod_shutdown, mod_newmap);
 101 }
 102
 103 void Mod_FreeModel (model_t *mod)
 104 {
 105         R_FreeTexturePool(&mod->texturepool);
 106         Mem_FreePool(&mod->mempool);
 107
 108         // clear the struct to make it available
 109         memset(mod, 0, sizeof(model_t));
 110 }
 111
 112 void Mod_UnloadModel (model_t *mod)
 113 {
 114         char name[MAX_QPATH];
 115         qboolean isworldmodel;
 116         qboolean used;
 117         strcpy(name, mod->name);
 118         isworldmodel = mod->isworldmodel;
 119         used = mod->used;
 120         Mod_FreeModel(mod);
 121         strcpy(mod->name, name);
 122         mod->isworldmodel = isworldmodel;
 123         mod->used = used;
 124         mod->loaded = false;
 125 }
 126
 127 /*
 128 ==================
 129 Mod_LoadModel
 130
 131 Loads a model
 132 ==================
 133 */
 134 model_t *Mod_LoadModel(model_t *mod, qboolean crash, qboolean checkdisk, qboolean isworldmodel)
 135 {
 136         int num;
 137         unsigned int crc;
 138         void *buf;
 139
 140         mod->used = true;
 141
 142         if (mod->name[0] == '*') // submodel
 143                 return mod;
 144
 145         crc = 0;
 146         buf = NULL;
 147         if (mod->isworldmodel != isworldmodel)
 148                 mod->loaded = false;
 149         if (!mod->loaded || checkdisk)
 150         {
 151                 if (checkdisk && mod->loaded)
 152                         Con_DPrintf("checking model %s\n", mod->name);
 153                 buf = FS_LoadFile (mod->name, tempmempool, false);
 154                 if (buf)
 155                 {
 156                         crc = CRC_Block(buf, fs_filesize);
 157                         if (mod->crc != crc)
 158                                 mod->loaded = false;
 159                 }
 160         }
 161         if (mod->loaded)
 162                 return mod; // already loaded
 163
 164         Con_DPrintf("loading model %s\n", mod->name);
 165         // LordHavoc: unload the existing model in this slot (if there is one)
 166         Mod_UnloadModel(mod);
 167
 168         // load the model
 169         mod->isworldmodel = isworldmodel;
 170         mod->used = true;
 171         mod->crc = crc;
 172         // errors can prevent the corresponding mod->loaded = true;
 173         mod->loaded = false;
 174
 175         // default model radius and bounding box (mainly for missing models)
 176         mod->radius = 16;
 177         VectorSet(mod->normalmins, -mod->radius, -mod->radius, -mod->radius);
 178         VectorSet(mod->normalmaxs, mod->radius, mod->radius, mod->radius);
 179         VectorSet(mod->yawmins, -mod->radius, -mod->radius, -mod->radius);
 180         VectorSet(mod->yawmaxs, mod->radius, mod->radius, mod->radius);
 181         VectorSet(mod->rotatedmins, -mod->radius, -mod->radius, -mod->radius);
 182         VectorSet(mod->rotatedmaxs, mod->radius, mod->radius, mod->radius);
 183
 184         // all models use memory, so allocate a memory pool
 185         mod->mempool = Mem_AllocPool(mod->name, 0, NULL);
 186         // all models load textures, so allocate a texture pool
 187         if (cls.state != ca_dedicated)
 188                 mod->texturepool = R_AllocTexturePool();
 189
 190         if (buf)
 191         {
 192                 num = LittleLong(*((int *)buf));
 193                 // call the apropriate loader
 194                 loadmodel = mod;
 195                      if (!memcmp(buf, "IDPO", 4)) Mod_IDP0_Load(mod, buf);
 196                 else if (!memcmp(buf, "IDP2", 4)) Mod_IDP2_Load(mod, buf);
 197                 else if (!memcmp(buf, "IDP3", 4)) Mod_IDP3_Load(mod, buf);
 198                 else if (!memcmp(buf, "IDSP", 4)) Mod_IDSP_Load(mod, buf);
 199                 else if (!memcmp(buf, "IDS2", 4)) Mod_IDS2_Load(mod, buf);
 200                 else if (!memcmp(buf, "IBSP", 4)) Mod_IBSP_Load(mod, buf);
 201                 else if (!memcmp(buf, "ZYMOTICMODEL", 12)) Mod_ZYMOTICMODEL_Load(mod, buf);
 202                 else if (strlen(mod->name) >= 4 && !strcmp(mod->name - 4, ".map")) Mod_MAP_Load(mod, buf);
 203                 else if (num == BSPVERSION || num == 30) Mod_Q1BSP_Load(mod, buf);
 204                 else Con_Printf("Mod_LoadModel: model \"%s\" is of unknown/unsupported type\n", mod->name);
 205                 Mem_Free(buf);
 206         }
 207         else if (crash)
 208         {
 209                 // LordHavoc: Sys_Error was *ANNOYING*
 210                 Con_Printf ("Mod_LoadModel: %s not found\n", mod->name);
 211         }
 212
 213         // no errors occurred
 214         mod->loaded = true;
 215         return mod;
 216 }
 217
 218 /*
 219 ===================
 220 Mod_ClearAll
 221 ===================
 222 */
 223 void Mod_ClearAll(void)
 224 {
 225 }
 226
 227 void Mod_ClearUsed(void)
 228 {
 229         int i;
 230         model_t *mod;
 231
 232         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 233                 if (mod->name[0])
 234                         mod->used = false;
 235 }
 236
 237 void Mod_PurgeUnused(void)
 238 {
 239         int i;
 240         model_t *mod;
 241
 242         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 243                 if (mod->name[0])
 244                         if (!mod->used)
 245                                 Mod_FreeModel(mod);
 246 }
 247
 248 // only used during loading!
 249 void Mod_RemoveStaleWorldModels(model_t *skip)
 250 {
 251         int i;
 252         for (i = 0;i < MAX_MOD_KNOWN;i++)
 253                 if (mod_known[i].isworldmodel && skip != &mod_known[i])
 254                         Mod_UnloadModel(mod_known + i);
 255 }
 256
 257 void Mod_LoadModels(void)
 258 {
 259         int i;
 260         model_t *mod;
 261
 262         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 263                 if (mod->name[0])
 264                         if (mod->used)
 265                                 Mod_CheckLoaded(mod);
 266 }
 267
 268 /*
 269 ==================
 270 Mod_FindName
 271
 272 ==================
 273 */
 274 model_t *Mod_FindName(const char *name)
 275 {
 276         int i;
 277         model_t *mod, *freemod;
 278
 279         if (!name[0])
 280                 Host_Error ("Mod_ForName: NULL name");
 281
 282 // search the currently loaded models
 283         freemod = NULL;
 284         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 285         {
 286                 if (mod->name[0])
 287                 {
 288                         if (!strcmp (mod->name, name))
 289                         {
 290                                 mod->used = true;
 291                                 return mod;
 292                         }
 293                 }
 294                 else if (freemod == NULL)
 295                         freemod = mod;
 296         }
 297
 298         if (freemod)
 299         {
 300                 mod = freemod;
 301                 strcpy (mod->name, name);
 302                 mod->loaded = false;
 303                 mod->used = true;
 304                 return mod;
 305         }
 306
 307         Host_Error ("Mod_FindName: ran out of models\n");
 308         return NULL;
 309 }
 310
 311 /*
 312 ==================
 313 Mod_ForName
 314
 315 Loads in a model for the given name
 316 ==================
 317 */
 318 model_t *Mod_ForName(const char *name, qboolean crash, qboolean checkdisk, qboolean isworldmodel)
 319 {
 320         return Mod_LoadModel(Mod_FindName(name), crash, checkdisk, isworldmodel);
 321 }
 322
 323 qbyte *mod_base;
 324
 325
 326 //=============================================================================
 327
 328 /*
 329 ================
 330 Mod_Print
 331 ================
 332 */
 333 static void Mod_Print(void)
 334 {
 335         int             i;
 336         model_t *mod;
 337
 338         Con_Print("Loaded models:\n");
 339         for (i = 0, mod = mod_known;i < MAX_MOD_KNOWN;i++, mod++)
 340                 if (mod->name[0])
 341                         Con_Printf("%4iK %s\n", mod->mempool ? (mod->mempool->totalsize + 1023) / 1024 : 0, mod->name);
 342 }
 343
 344 /*
 345 ================
 346 Mod_Precache
 347 ================
 348 */
 349 static void Mod_Precache(void)
 350 {
 351         if (Cmd_Argc() == 2)
 352                 Mod_ForName(Cmd_Argv(1), false, true, cl.worldmodel && !strcasecmp(Cmd_Argv(1), cl.worldmodel->name));
 353         else
 354                 Con_Print("usage: modelprecache <filename>\n");
 355 }
 356
 357 int Mod_BuildVertexRemapTableFromElements(int numelements, const int *elements, int numvertices, int *remapvertices)
 358 {
 359         int i, count;
 360         qbyte *used;
 361         used = Mem_Alloc(tempmempool, numvertices);
 362         memset(used, 0, numvertices);
 363         for (i = 0;i < numelements;i++)
 364                 used[elements[i]] = 1;
 365         for (i = 0, count = 0;i < numvertices;i++)
 366                 remapvertices[i] = used[i] ? count++ : -1;
 367         Mem_Free(used);
 368         return count;
 369 }
 370
 371 #if 1
 372 // fast way, using an edge hash
 373 #define TRIANGLEEDGEHASH 8192
 374 void Mod_BuildTriangleNeighbors(int *neighbors, const int *elements, int numtriangles)
 375 {
 376         int i, j, p, e1, e2, *n, hashindex, count, match;
 377         const int *e;
 378         typedef struct edgehashentry_s
 379         {
 380                 struct edgehashentry_s *next;
 381                 int triangle;
 382                 int element[2];
 383         }
 384         edgehashentry_t;
 385         edgehashentry_t *edgehash[TRIANGLEEDGEHASH], *edgehashentries, edgehashentriesbuffer[TRIANGLEEDGEHASH*3], *hash;
 386         memset(edgehash, 0, sizeof(edgehash));
 387         edgehashentries = edgehashentriesbuffer;
 388         // if there are too many triangles for the stack array, allocate larger buffer
 389         if (numtriangles > TRIANGLEEDGEHASH)
 390                 edgehashentries = Mem_Alloc(tempmempool, numtriangles * 3 * sizeof(edgehashentry_t));
 391         // find neighboring triangles
 392         for (i = 0, e = elements, n = neighbors;i < numtriangles;i++, e += 3, n += 3)
 393         {
 394                 for (j = 0, p = 2;j < 3;p = j, j++)
 395                 {
 396                         e1 = e[p];
 397                         e2 = e[j];
 398                         // this hash index works for both forward and backward edges
 399                         hashindex = (unsigned int)(e1 + e2) % TRIANGLEEDGEHASH;
 400                         hash = edgehashentries + i * 3 + j;
 401                         hash->next = edgehash[hashindex];
 402                         edgehash[hashindex] = hash;
 403                         hash->triangle = i;
 404                         hash->element[0] = e1;
 405                         hash->element[1] = e2;
 406                 }
 407         }
 408         for (i = 0, e = elements, n = neighbors;i < numtriangles;i++, e += 3, n += 3)
 409         {
 410                 for (j = 0, p = 2;j < 3;p = j, j++)
 411                 {
 412                         e1 = e[p];
 413                         e2 = e[j];
 414                         // this hash index works for both forward and backward edges
 415                         hashindex = (unsigned int)(e1 + e2) % TRIANGLEEDGEHASH;
 416                         count = 0;
 417                         match = -1;
 418                         for (hash = edgehash[hashindex];hash;hash = hash->next)
 419                         {
 420                                 if (hash->element[0] == e2 && hash->element[1] == e1)
 421                                 {
 422                                         if (hash->triangle != i)
 423                                                 match = hash->triangle;
 424                                         count++;
 425                                 }
 426                                 else if ((hash->element[0] == e1 && hash->element[1] == e2))
 427                                         count++;
 428                         }
 429                         // detect edges shared by three triangles and make them seams
 430                         if (count > 2)
 431                                 match = -1;
 432                         n[p] = match;
 433                 }
 434         }
 435         // free the allocated buffer
 436         if (edgehashentries != edgehashentriesbuffer)
 437                 Mem_Free(edgehashentries);
 438 }
 439 #else
 440 // very slow but simple way
 441 static int Mod_FindTriangleWithEdge(const int *elements, int numtriangles, int start, int end, int ignore)
 442 {
 443         int i, match, count;
 444         count = 0;
 445         match = -1;
 446         for (i = 0;i < numtriangles;i++, elements += 3)
 447         {
 448                      if ((elements[0] == start && elements[1] == end)
 449                       || (elements[1] == start && elements[2] == end)
 450                       || (elements[2] == start && elements[0] == end))
 451                 {
 452                         if (i != ignore)
 453                                 match = i;
 454                         count++;
 455                 }
 456                 else if ((elements[1] == start && elements[0] == end)
 457                       || (elements[2] == start && elements[1] == end)
 458                       || (elements[0] == start && elements[2] == end))
 459                         count++;
 460         }
 461         // detect edges shared by three triangles and make them seams
 462         if (count > 2)
 463                 match = -1;
 464         return match;
 465 }
 466
 467 void Mod_BuildTriangleNeighbors(int *neighbors, const int *elements, int numtriangles)
 468 {
 469         int i, *n;
 470         const int *e;
 471         for (i = 0, e = elements, n = neighbors;i < numtriangles;i++, e += 3, n += 3)
 472         {
 473                 n[0] = Mod_FindTriangleWithEdge(elements, numtriangles, e[1], e[0], i);
 474                 n[1] = Mod_FindTriangleWithEdge(elements, numtriangles, e[2], e[1], i);
 475                 n[2] = Mod_FindTriangleWithEdge(elements, numtriangles, e[0], e[2], i);
 476         }
 477 }
 478 #endif
 479
 480 void Mod_ValidateElements(const int *elements, int numtriangles, int numverts, const char *filename, int fileline)
 481 {
 482         int i;
 483         for (i = 0;i < numtriangles * 3;i++)
 484                 if ((unsigned int)elements[i] >= (unsigned int)numverts)
 485                         Con_Printf("Mod_ValidateElements: out of bounds element detected at %s:%d\n", filename, fileline);
 486 }
 487
 488 // warning: this is an expensive function!
 489 void Mod_BuildNormals(int firstvertex, int numvertices, int numtriangles, const float *vertex3f, const int *elements, float *normal3f, qboolean areaweighting)
 490 {
 491         int i, j;
 492         const int *element;
 493         float *vectorNormal;
 494         float areaNormal[3];
 495         // clear the vectors
 496         memset(normal3f + 3 * firstvertex, 0, numvertices * sizeof(float[3]));
 497         // process each vertex of each triangle and accumulate the results
 498         // use area-averaging, to make triangles with a big area have a bigger
 499         // weighting on the vertex normal than triangles with a small area
 500         // to do so, just add the 'normals' together (the bigger the area
 501         // the greater the length of the normal is
 502         element = elements;
 503         for (i = 0; i < numtriangles; i++, element += 3)
 504         {
 505                 TriangleNormal(
 506                         vertex3f + element[0] * 3,
 507                         vertex3f + element[1] * 3,
 508                         vertex3f + element[2] * 3,
 509                         areaNormal
 510                         );
 511
 512                 if (!areaweighting)
 513                         VectorNormalize(areaNormal);
 514
 515                 for (j = 0;j < 3;j++)
 516                 {
 517                         vectorNormal = normal3f + element[j] * 3;
 518                         vectorNormal[0] += areaNormal[0];
 519                         vectorNormal[1] += areaNormal[1];
 520                         vectorNormal[2] += areaNormal[2];
 521                 }
 522         }
 523         // and just normalize the accumulated vertex normal in the end
 524         vectorNormal = normal3f + 3 * firstvertex;
 525         for (i = 0; i < numvertices; i++, vectorNormal += 3)
 526                 VectorNormalize(vectorNormal);
 527 }
 528
 529 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)
 530 {
 531         float f, tangentcross[3], v10[3], v20[3], tc10[2], tc20[2];
 532         // 79 add/sub/negate/multiply (1 cycle), 1 compare (3 cycle?), total cycles not counting load/store/exchange roughly 82 cycles
 533         // 6 add, 28 subtract, 39 multiply, 1 compare, 50% chance of 6 negates
 534
 535         // 6 multiply, 9 subtract
 536         VectorSubtract(v1, v0, v10);
 537         VectorSubtract(v2, v0, v20);
 538         normal3f[0] = v10[1] * v20[2] - v10[2] * v20[1];
 539         normal3f[1] = v10[2] * v20[0] - v10[0] * v20[2];
 540         normal3f[2] = v10[0] * v20[1] - v10[1] * v20[0];
 541         // 12 multiply, 10 subtract
 542         tc10[1] = tc1[1] - tc0[1];
 543         tc20[1] = tc2[1] - tc0[1];
 544         svector3f[0] = tc10[1] * v20[0] - tc20[1] * v10[0];
 545         svector3f[1] = tc10[1] * v20[1] - tc20[1] * v10[1];
 546         svector3f[2] = tc10[1] * v20[2] - tc20[1] * v10[2];
 547         tc10[0] = tc1[0] - tc0[0];
 548         tc20[0] = tc2[0] - tc0[0];
 549         tvector3f[0] = tc10[0] * v20[0] - tc20[0] * v10[0];
 550         tvector3f[1] = tc10[0] * v20[1] - tc20[0] * v10[1];
 551         tvector3f[2] = tc10[0] * v20[2] - tc20[0] * v10[2];
 552         // 12 multiply, 4 add, 6 subtract
 553         f = DotProduct(svector3f, normal3f);
 554         svector3f[0] -= f * normal3f[0];
 555         svector3f[1] -= f * normal3f[1];
 556         svector3f[2] -= f * normal3f[2];
 557         f = DotProduct(tvector3f, normal3f);
 558         tvector3f[0] -= f * normal3f[0];
 559         tvector3f[1] -= f * normal3f[1];
 560         tvector3f[2] -= f * normal3f[2];
 561         // if texture is mapped the wrong way (counterclockwise), the tangents
 562         // have to be flipped, this is detected by calculating a normal from the
 563         // two tangents, and seeing if it is opposite the surface normal
 564         // 9 multiply, 2 add, 3 subtract, 1 compare, 50% chance of: 6 negates
 565         CrossProduct(tvector3f, svector3f, tangentcross);
 566         if (DotProduct(tangentcross, normal3f) < 0)
 567         {
 568                 VectorNegate(svector3f, svector3f);
 569                 VectorNegate(tvector3f, tvector3f);
 570         }
 571 }
 572
 573 // warning: this is a very expensive function!
 574 void Mod_BuildTextureVectorsAndNormals(int firstvertex, int numvertices, int numtriangles, const float *vertex3f, const float *texcoord2f, const int *elements, float *svector3f, float *tvector3f, float *normal3f, qboolean areaweighting)
 575 {
 576         int i, tnum;
 577         float sdir[3], tdir[3], normal[3], *v;
 578         const int *e;
 579         // clear the vectors
 580         if (svector3f)
 581                 memset(svector3f + 3 * firstvertex, 0, numvertices * sizeof(float[3]));
 582         if (tvector3f)
 583                 memset(tvector3f + 3 * firstvertex, 0, numvertices * sizeof(float[3]));
 584         if (normal3f)
 585                 memset(normal3f + 3 * firstvertex, 0, numvertices * sizeof(float[3]));
 586         // process each vertex of each triangle and accumulate the results
 587         for (tnum = 0, e = elements;tnum < numtriangles;tnum++, e += 3)
 588         {
 589                 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);
 590                 if (!areaweighting)
 591                 {
 592                         VectorNormalize(sdir);
 593                         VectorNormalize(tdir);
 594                         VectorNormalize(normal);
 595                 }
 596                 if (svector3f)
 597                         for (i = 0;i < 3;i++)
 598                                 VectorAdd(svector3f + e[i]*3, sdir, svector3f + e[i]*3);
 599                 if (tvector3f)
 600                         for (i = 0;i < 3;i++)
 601                                 VectorAdd(tvector3f + e[i]*3, tdir, tvector3f + e[i]*3);
 602                 if (normal3f)
 603                         for (i = 0;i < 3;i++)
 604                                 VectorAdd(normal3f + e[i]*3, normal, normal3f + e[i]*3);
 605         }
 606         // now we could divide the vectors by the number of averaged values on
 607         // each vertex...  but instead normalize them
 608         // 4 assignments, 1 divide, 1 sqrt, 2 adds, 6 multiplies
 609         if (svector3f)
 610                 for (i = 0, v = svector3f + 3 * firstvertex;i < numvertices;i++, v += 3)
 611                         VectorNormalize(v);
 612         // 4 assignments, 1 divide, 1 sqrt, 2 adds, 6 multiplies
 613         if (tvector3f)
 614                 for (i = 0, v = tvector3f + 3 * firstvertex;i < numvertices;i++, v += 3)
 615                         VectorNormalize(v);
 616         // 4 assignments, 1 divide, 1 sqrt, 2 adds, 6 multiplies
 617         if (normal3f)
 618                 for (i = 0, v = normal3f + 3 * firstvertex;i < numvertices;i++, v += 3)
 619                         VectorNormalize(v);
 620 }
 621
 622 surfmesh_t *Mod_AllocSurfMesh(mempool_t *mempool, int numvertices, int numtriangles, qboolean detailtexcoords, qboolean lightmapoffsets, qboolean vertexcolors, qboolean neighbors)
 623 {
 624         surfmesh_t *mesh;
 625         qbyte *data;
 626         mesh = Mem_Alloc(mempool, sizeof(surfmesh_t) + numvertices * (3 + 3 + 3 + 3 + 2 + 2 + (detailtexcoords ? 2 : 0) + (vertexcolors ? 4 : 0)) * sizeof(float) + numvertices * (lightmapoffsets ? 1 : 0) * sizeof(int) + numtriangles * (3 + 3 + (neighbors ? 3 : 0)) * sizeof(int));
 627         mesh->num_vertices = numvertices;
 628         mesh->num_triangles = numtriangles;
 629         data = (qbyte *)(mesh + 1);
 630         if (mesh->num_vertices)
 631         {
 632                 mesh->data_vertex3f = (float *)data, data += sizeof(float[3]) * mesh->num_vertices;
 633                 mesh->data_svector3f = (float *)data, data += sizeof(float[3]) * mesh->num_vertices;
 634                 mesh->data_tvector3f = (float *)data, data += sizeof(float[3]) * mesh->num_vertices;
 635                 mesh->data_normal3f = (float *)data, data += sizeof(float[3]) * mesh->num_vertices;
 636                 mesh->data_texcoordtexture2f = (float *)data, data += sizeof(float[2]) * mesh->num_vertices;
 637                 mesh->data_texcoordlightmap2f = (float *)data, data += sizeof(float[2]) * mesh->num_vertices;
 638                 if (detailtexcoords)
 639                         mesh->data_texcoorddetail2f = (float *)data, data += sizeof(float[2]) * mesh->num_vertices;
 640                 if (vertexcolors)
 641                         mesh->data_lightmapcolor4f = (float *)data, data += sizeof(float[4]) * mesh->num_vertices;
 642                 if (lightmapoffsets)
 643                         mesh->data_lightmapoffsets = (int *)data, data += sizeof(int) * mesh->num_vertices;
 644         }
 645         if (mesh->num_triangles)
 646         {
 647                 mesh->data_element3i = (int *)data, data += sizeof(int[3]) * mesh->num_triangles;
 648                 mesh->data_element3i = (int *)data, data += sizeof(int[3]) * mesh->num_triangles;
 649                 if (neighbors)
 650                         mesh->data_neighbor3i = (int *)data, data += sizeof(int[3]) * mesh->num_triangles;
 651         }
 652         return mesh;
 653 }
 654
 655 shadowmesh_t *Mod_ShadowMesh_Alloc(mempool_t *mempool, int maxverts, int maxtriangles, rtexture_t *map_diffuse, rtexture_t *map_specular, rtexture_t *map_normal, int light, int neighbors, int expandable)
 656 {
 657         shadowmesh_t *newmesh;
 658         qbyte *data;
 659         int size;
 660         size = sizeof(shadowmesh_t);
 661         size += maxverts * sizeof(float[3]);
 662         if (light)
 663                 size += maxverts * sizeof(float[11]);
 664         size += maxtriangles * sizeof(int[3]);
 665         if (neighbors)
 666                 size += maxtriangles * sizeof(int[3]);
 667         if (expandable)
 668                 size += SHADOWMESHVERTEXHASH * sizeof(shadowmeshvertexhash_t *) + maxverts * sizeof(shadowmeshvertexhash_t);
 669         data = Mem_Alloc(mempool, size);
 670         newmesh = (void *)data;data += sizeof(*newmesh);
 671         newmesh->map_diffuse = map_diffuse;
 672         newmesh->map_specular = map_specular;
 673         newmesh->map_normal = map_normal;
 674         newmesh->maxverts = maxverts;
 675         newmesh->maxtriangles = maxtriangles;
 676         newmesh->numverts = 0;
 677         newmesh->numtriangles = 0;
 678
 679         newmesh->vertex3f = (void *)data;data += maxverts * sizeof(float[3]);
 680         if (light)
 681         {
 682                 newmesh->svector3f = (void *)data;data += maxverts * sizeof(float[3]);
 683                 newmesh->tvector3f = (void *)data;data += maxverts * sizeof(float[3]);
 684                 newmesh->normal3f = (void *)data;data += maxverts * sizeof(float[3]);
 685                 newmesh->texcoord2f = (void *)data;data += maxverts * sizeof(float[2]);
 686         }
 687         newmesh->element3i = (void *)data;data += maxtriangles * sizeof(int[3]);
 688         if (neighbors)
 689         {
 690                 newmesh->neighbor3i = (void *)data;data += maxtriangles * sizeof(int[3]);
 691         }
 692         if (expandable)
 693         {
 694                 newmesh->vertexhashtable = (void *)data;data += SHADOWMESHVERTEXHASH * sizeof(shadowmeshvertexhash_t *);
 695                 newmesh->vertexhashentries = (void *)data;data += maxverts * sizeof(shadowmeshvertexhash_t);
 696         }
 697         return newmesh;
 698 }
 699
 700 shadowmesh_t *Mod_ShadowMesh_ReAlloc(mempool_t *mempool, shadowmesh_t *oldmesh, int light, int neighbors)
 701 {
 702         shadowmesh_t *newmesh;
 703         newmesh = Mod_ShadowMesh_Alloc(mempool, oldmesh->numverts, oldmesh->numtriangles, oldmesh->map_diffuse, oldmesh->map_specular, oldmesh->map_normal, light, neighbors, false);
 704         newmesh->numverts = oldmesh->numverts;
 705         newmesh->numtriangles = oldmesh->numtriangles;
 706
 707         memcpy(newmesh->vertex3f, oldmesh->vertex3f, oldmesh->numverts * sizeof(float[3]));
 708         if (newmesh->svector3f && oldmesh->svector3f)
 709         {
 710                 memcpy(newmesh->svector3f, oldmesh->svector3f, oldmesh->numverts * sizeof(float[3]));
 711                 memcpy(newmesh->tvector3f, oldmesh->tvector3f, oldmesh->numverts * sizeof(float[3]));
 712                 memcpy(newmesh->normal3f, oldmesh->normal3f, oldmesh->numverts * sizeof(float[3]));
 713                 memcpy(newmesh->texcoord2f, oldmesh->texcoord2f, oldmesh->numverts * sizeof(float[2]));
 714         }
 715         memcpy(newmesh->element3i, oldmesh->element3i, oldmesh->numtriangles * sizeof(int[3]));
 716         if (newmesh->neighbor3i && oldmesh->neighbor3i)
 717                 memcpy(newmesh->neighbor3i, oldmesh->neighbor3i, oldmesh->numtriangles * sizeof(int[3]));
 718         return newmesh;
 719 }
 720
 721 int Mod_ShadowMesh_AddVertex(shadowmesh_t *mesh, float *vertex14f)
 722 {
 723         int hashindex, vnum;
 724         shadowmeshvertexhash_t *hash;
 725         // this uses prime numbers intentionally
 726         hashindex = (unsigned int) (vertex14f[0] * 3 + vertex14f[1] * 5 + vertex14f[2] * 7) % SHADOWMESHVERTEXHASH;
 727         for (hash = mesh->vertexhashtable[hashindex];hash;hash = hash->next)
 728         {
 729                 vnum = (hash - mesh->vertexhashentries);
 730                 if ((mesh->vertex3f == NULL || (mesh->vertex3f[vnum * 3 + 0] == vertex14f[0] && mesh->vertex3f[vnum * 3 + 1] == vertex14f[1] && mesh->vertex3f[vnum * 3 + 2] == vertex14f[2]))
 731                  && (mesh->svector3f == NULL || (mesh->svector3f[vnum * 3 + 0] == vertex14f[3] && mesh->svector3f[vnum * 3 + 1] == vertex14f[4] && mesh->svector3f[vnum * 3 + 2] == vertex14f[5]))
 732                  && (mesh->tvector3f == NULL || (mesh->tvector3f[vnum * 3 + 0] == vertex14f[6] && mesh->tvector3f[vnum * 3 + 1] == vertex14f[7] && mesh->tvector3f[vnum * 3 + 2] == vertex14f[8]))
 733                  && (mesh->normal3f == NULL || (mesh->normal3f[vnum * 3 + 0] == vertex14f[9] && mesh->normal3f[vnum * 3 + 1] == vertex14f[10] && mesh->normal3f[vnum * 3 + 2] == vertex14f[11]))
 734                  && (mesh->texcoord2f == NULL || (mesh->texcoord2f[vnum * 2 + 0] == vertex14f[12] && mesh->texcoord2f[vnum * 2 + 1] == vertex14f[13])))
 735                         return hash - mesh->vertexhashentries;
 736         }
 737         vnum = mesh->numverts++;
 738         hash = mesh->vertexhashentries + vnum;
 739         hash->next = mesh->vertexhashtable[hashindex];
 740         mesh->vertexhashtable[hashindex] = hash;
 741         if (mesh->vertex3f) {mesh->vertex3f[vnum * 3 + 0] = vertex14f[0];mesh->vertex3f[vnum * 3 + 1] = vertex14f[1];mesh->vertex3f[vnum * 3 + 2] = vertex14f[2];}
 742         if (mesh->svector3f) {mesh->svector3f[vnum * 3 + 0] = vertex14f[3];mesh->svector3f[vnum * 3 + 1] = vertex14f[4];mesh->svector3f[vnum * 3 + 2] = vertex14f[5];}
 743         if (mesh->tvector3f) {mesh->tvector3f[vnum * 3 + 0] = vertex14f[6];mesh->tvector3f[vnum * 3 + 1] = vertex14f[7];mesh->tvector3f[vnum * 3 + 2] = vertex14f[8];}
 744         if (mesh->normal3f) {mesh->normal3f[vnum * 3 + 0] = vertex14f[9];mesh->normal3f[vnum * 3 + 1] = vertex14f[10];mesh->normal3f[vnum * 3 + 2] = vertex14f[11];}
 745         if (mesh->texcoord2f) {mesh->texcoord2f[vnum * 2 + 0] = vertex14f[12];mesh->texcoord2f[vnum * 2 + 1] = vertex14f[13];}
 746         return vnum;
 747 }
 748
 749 void Mod_ShadowMesh_AddTriangle(mempool_t *mempool, shadowmesh_t *mesh, rtexture_t *map_diffuse, rtexture_t *map_specular, rtexture_t *map_normal, float *vertex14f)
 750 {
 751         if (mesh->numtriangles == 0)
 752         {
 753                 // set the properties on this empty mesh to be more favorable...
 754                 // (note: this case only occurs for the first triangle added to a new mesh chain)
 755                 mesh->map_diffuse = map_diffuse;
 756                 mesh->map_specular = map_specular;
 757                 mesh->map_normal = map_normal;
 758         }
 759         while (mesh->map_diffuse != map_diffuse || mesh->map_specular != map_specular || mesh->map_normal != map_normal || mesh->numverts + 3 > mesh->maxverts || mesh->numtriangles + 1 > mesh->maxtriangles)
 760         {
 761                 if (mesh->next == NULL)
 762                         mesh->next = Mod_ShadowMesh_Alloc(mempool, max(mesh->maxverts, 300), max(mesh->maxtriangles, 100), map_diffuse, map_specular, map_normal, mesh->svector3f != NULL, mesh->neighbor3i != NULL, true);
 763                 mesh = mesh->next;
 764         }
 765         mesh->element3i[mesh->numtriangles * 3 + 0] = Mod_ShadowMesh_AddVertex(mesh, vertex14f + 14 * 0);
 766         mesh->element3i[mesh->numtriangles * 3 + 1] = Mod_ShadowMesh_AddVertex(mesh, vertex14f + 14 * 1);
 767         mesh->element3i[mesh->numtriangles * 3 + 2] = Mod_ShadowMesh_AddVertex(mesh, vertex14f + 14 * 2);
 768         mesh->numtriangles++;
 769 }
 770
 771 void Mod_ShadowMesh_AddMesh(mempool_t *mempool, shadowmesh_t *mesh, rtexture_t *map_diffuse, rtexture_t *map_specular, rtexture_t *map_normal, const float *vertex3f, const float *svector3f, const float *tvector3f, const float *normal3f, const float *texcoord2f, int numtris, const int *element3i)
 772 {
 773         int i, j, e;
 774         float vbuf[3*14], *v;
 775         memset(vbuf, 0, sizeof(vbuf));
 776         for (i = 0;i < numtris;i++)
 777         {
 778                 for (j = 0, v = vbuf;j < 3;j++, v += 14)
 779                 {
 780                         e = *element3i++;
 781                         if (vertex3f)
 782                         {
 783                                 v[0] = vertex3f[e * 3 + 0];
 784                                 v[1] = vertex3f[e * 3 + 1];
 785                                 v[2] = vertex3f[e * 3 + 2];
 786                         }
 787                         if (svector3f)
 788                         {
 789                                 v[3] = svector3f[e * 3 + 0];
 790                                 v[4] = svector3f[e * 3 + 1];
 791                                 v[5] = svector3f[e * 3 + 2];
 792                         }
 793                         if (tvector3f)
 794                         {
 795                                 v[6] = tvector3f[e * 3 + 0];
 796                                 v[7] = tvector3f[e * 3 + 1];
 797                                 v[8] = tvector3f[e * 3 + 2];
 798                         }
 799                         if (normal3f)
 800                         {
 801                                 v[9] = normal3f[e * 3 + 0];
 802                                 v[10] = normal3f[e * 3 + 1];
 803                                 v[11] = normal3f[e * 3 + 2];
 804                         }
 805                         if (texcoord2f)
 806                         {
 807                                 v[12] = texcoord2f[e * 2 + 0];
 808                                 v[13] = texcoord2f[e * 2 + 1];
 809                         }
 810                 }
 811                 Mod_ShadowMesh_AddTriangle(mempool, mesh, map_diffuse, map_specular, map_normal, vbuf);
 812         }
 813 }
 814
 815 shadowmesh_t *Mod_ShadowMesh_Begin(mempool_t *mempool, int maxverts, int maxtriangles, rtexture_t *map_diffuse, rtexture_t *map_specular, rtexture_t *map_normal, int light, int neighbors, int expandable)
 816 {
 817         return Mod_ShadowMesh_Alloc(mempool, maxverts, maxtriangles, map_diffuse, map_specular, map_normal, light, neighbors, expandable);
 818 }
 819
 820 shadowmesh_t *Mod_ShadowMesh_Finish(mempool_t *mempool, shadowmesh_t *firstmesh, int light, int neighbors)
 821 {
 822         shadowmesh_t *mesh, *newmesh, *nextmesh;
 823         // reallocate meshs to conserve space
 824         for (mesh = firstmesh, firstmesh = NULL;mesh;mesh = nextmesh)
 825         {
 826                 nextmesh = mesh->next;
 827                 if (mesh->numverts >= 3 && mesh->numtriangles >= 1)
 828                 {
 829                         newmesh = Mod_ShadowMesh_ReAlloc(mempool, mesh, light, neighbors);
 830                         newmesh->next = firstmesh;
 831                         firstmesh = newmesh;
 832                 }
 833                 Mem_Free(mesh);
 834         }
 835         return firstmesh;
 836 }
 837
 838 void Mod_ShadowMesh_CalcBBox(shadowmesh_t *firstmesh, vec3_t mins, vec3_t maxs, vec3_t center, float *radius)
 839 {
 840         int i;
 841         shadowmesh_t *mesh;
 842         vec3_t nmins, nmaxs, ncenter, temp;
 843         float nradius2, dist2, *v;
 844         // calculate bbox
 845         for (mesh = firstmesh;mesh;mesh = mesh->next)
 846         {
 847                 if (mesh == firstmesh)
 848                 {
 849                         VectorCopy(mesh->vertex3f, nmins);
 850                         VectorCopy(mesh->vertex3f, nmaxs);
 851                 }
 852                 for (i = 0, v = mesh->vertex3f;i < mesh->numverts;i++, v += 3)
 853                 {
 854                         if (nmins[0] > v[0]) nmins[0] = v[0];if (nmaxs[0] < v[0]) nmaxs[0] = v[0];
 855                         if (nmins[1] > v[1]) nmins[1] = v[1];if (nmaxs[1] < v[1]) nmaxs[1] = v[1];
 856                         if (nmins[2] > v[2]) nmins[2] = v[2];if (nmaxs[2] < v[2]) nmaxs[2] = v[2];
 857                 }
 858         }
 859         // calculate center and radius
 860         ncenter[0] = (nmins[0] + nmaxs[0]) * 0.5f;
 861         ncenter[1] = (nmins[1] + nmaxs[1]) * 0.5f;
 862         ncenter[2] = (nmins[2] + nmaxs[2]) * 0.5f;
 863         nradius2 = 0;
 864         for (mesh = firstmesh;mesh;mesh = mesh->next)
 865         {
 866                 for (i = 0, v = mesh->vertex3f;i < mesh->numverts;i++, v += 3)
 867                 {
 868                         VectorSubtract(v, ncenter, temp);
 869                         dist2 = DotProduct(temp, temp);
 870                         if (nradius2 < dist2)
 871                                 nradius2 = dist2;
 872                 }
 873         }
 874         // return data
 875         if (mins)
 876                 VectorCopy(nmins, mins);
 877         if (maxs)
 878                 VectorCopy(nmaxs, maxs);
 879         if (center)
 880                 VectorCopy(ncenter, center);
 881         if (radius)
 882                 *radius = sqrt(nradius2);
 883 }
 884
 885 void Mod_ShadowMesh_Free(shadowmesh_t *mesh)
 886 {
 887         shadowmesh_t *nextmesh;
 888         for (;mesh;mesh = nextmesh)
 889         {
 890                 nextmesh = mesh->next;
 891                 Mem_Free(mesh);
 892         }
 893 }
 894
 895 static rtexture_t *GL_TextureForSkinLayer(const qbyte *in, int width, int height, const char *name, const unsigned int *palette, int textureflags)
 896 {
 897         int i;
 898         for (i = 0;i < width*height;i++)
 899                 if (((qbyte *)&palette[in[i]])[3] > 0)
 900                         return R_LoadTexture2D (loadmodel->texturepool, name, width, height, in, TEXTYPE_PALETTE, textureflags, palette);
 901         return NULL;
 902 }
 903
 904 static int detailtexturecycle = 0;
 905 int Mod_LoadSkinFrame(skinframe_t *skinframe, char *basename, int textureflags, int loadpantsandshirt, int usedetailtexture, int loadglowtexture)
 906 {
 907         imageskin_t s;
 908         memset(skinframe, 0, sizeof(*skinframe));
 909         if (!image_loadskin(&s, basename))
 910                 return false;
 911         if (usedetailtexture)
 912                 skinframe->detail = r_texture_detailtextures[(detailtexturecycle++) % NUM_DETAILTEXTURES];
 913         skinframe->base = R_LoadTexture2D (loadmodel->texturepool, basename, s.basepixels_width, s.basepixels_height, s.basepixels, TEXTYPE_RGBA, textureflags, NULL);
 914         if (s.nmappixels != NULL)
 915                 skinframe->nmap = R_LoadTexture2D (loadmodel->texturepool, va("%s_nmap", basename), s.nmappixels_width, s.nmappixels_height, s.nmappixels, TEXTYPE_RGBA, textureflags, NULL);
 916         if (s.glosspixels != NULL)
 917                 skinframe->gloss = R_LoadTexture2D (loadmodel->texturepool, va("%s_gloss", basename), s.glosspixels_width, s.glosspixels_height, s.glosspixels, TEXTYPE_RGBA, textureflags, NULL);
 918         if (s.glowpixels != NULL && loadglowtexture)
 919                 skinframe->glow = R_LoadTexture2D (loadmodel->texturepool, va("%s_glow", basename), s.glowpixels_width, s.glowpixels_height, s.glowpixels, TEXTYPE_RGBA, textureflags, NULL);
 920         if (s.maskpixels != NULL)
 921                 skinframe->fog = R_LoadTexture2D (loadmodel->texturepool, va("%s_mask", basename), s.maskpixels_width, s.maskpixels_height, s.maskpixels, TEXTYPE_RGBA, textureflags, NULL);
 922         if (loadpantsandshirt)
 923         {
 924                 if (s.pantspixels != NULL)
 925                         skinframe->pants = R_LoadTexture2D (loadmodel->texturepool, va("%s_pants", basename), s.pantspixels_width, s.pantspixels_height, s.pantspixels, TEXTYPE_RGBA, textureflags, NULL);
 926                 if (s.shirtpixels != NULL)
 927                         skinframe->shirt = R_LoadTexture2D (loadmodel->texturepool, va("%s_shirt", basename), s.shirtpixels_width, s.shirtpixels_height, s.shirtpixels, TEXTYPE_RGBA, textureflags, NULL);
 928         }
 929         image_freeskin(&s);
 930         return true;
 931 }
 932
 933 int Mod_LoadSkinFrame_Internal(skinframe_t *skinframe, char *basename, int textureflags, int loadpantsandshirt, int usedetailtexture, int loadglowtexture, qbyte *skindata, int width, int height)
 934 {
 935         qbyte *temp1, *temp2;
 936         memset(skinframe, 0, sizeof(*skinframe));
 937         if (!skindata)
 938                 return false;
 939         if (usedetailtexture)
 940                 skinframe->detail = r_texture_detailtextures[(detailtexturecycle++) % NUM_DETAILTEXTURES];
 941         if (r_shadow_bumpscale_basetexture.value > 0)
 942         {
 943                 temp1 = Mem_Alloc(loadmodel->mempool, width * height * 8);
 944                 temp2 = temp1 + width * height * 4;
 945                 Image_Copy8bitRGBA(skindata, temp1, width * height, palette_nofullbrights);
 946                 Image_HeightmapToNormalmap(temp1, temp2, width, height, false, r_shadow_bumpscale_basetexture.value);
 947                 skinframe->nmap = R_LoadTexture2D(loadmodel->texturepool, va("%s_nmap", basename), width, height, temp2, TEXTYPE_RGBA, textureflags, NULL);
 948                 Mem_Free(temp1);
 949         }
 950         if (loadglowtexture)
 951         {
 952                 skinframe->glow = GL_TextureForSkinLayer(skindata, width, height, va("%s_glow", basename), palette_onlyfullbrights, textureflags); // glow
 953                 skinframe->base = skinframe->merged = GL_TextureForSkinLayer(skindata, width, height, va("%s_merged", basename), palette_nofullbrights, textureflags); // all but fullbrights
 954                 if (loadpantsandshirt)
 955                 {
 956                         skinframe->pants = GL_TextureForSkinLayer(skindata, width, height, va("%s_pants", basename), palette_pantsaswhite, textureflags); // pants
 957                         skinframe->shirt = GL_TextureForSkinLayer(skindata, width, height, va("%s_shirt", basename), palette_shirtaswhite, textureflags); // shirt
 958                         if (skinframe->pants || skinframe->shirt)
 959                                 skinframe->base = GL_TextureForSkinLayer(skindata, width, height, va("%s_nospecial", basename), palette_nocolormapnofullbrights, textureflags); // no special colors
 960                 }
 961         }
 962         else
 963         {
 964                 skinframe->base = skinframe->merged = GL_TextureForSkinLayer(skindata, width, height, va("%s_merged", basename), palette_complete, textureflags); // all
 965                 if (loadpantsandshirt)
 966                 {
 967                         skinframe->pants = GL_TextureForSkinLayer(skindata, width, height, va("%s_pants", basename), palette_pantsaswhite, textureflags); // pants
 968                         skinframe->shirt = GL_TextureForSkinLayer(skindata, width, height, va("%s_shirt", basename), palette_shirtaswhite, textureflags); // shirt
 969                         if (skinframe->pants || skinframe->shirt)
 970                                 skinframe->base = GL_TextureForSkinLayer(skindata, width, height, va("%s_nospecial", basename), palette_nocolormap, textureflags); // no pants or shirt
 971                 }
 972         }
 973         return true;
 974 }
 975
 976 void Mod_GetTerrainVertex3fTexCoord2fFromRGBA(const qbyte *imagepixels, int imagewidth, int imageheight, int ix, int iy, float *vertex3f, float *texcoord2f, matrix4x4_t *pixelstepmatrix, matrix4x4_t *pixeltexturestepmatrix)
 977 {
 978         float v[3], tc[3];
 979         v[0] = ix;
 980         v[1] = iy;
 981         if (ix >= 0 && iy >= 0 && ix < imagewidth && iy < imageheight)
 982                 v[2] = (imagepixels[((iy*imagewidth)+ix)*4+0] + imagepixels[((iy*imagewidth)+ix)*4+1] + imagepixels[((iy*imagewidth)+ix)*4+2]) * (1.0f / 765.0f);
 983         else
 984                 v[2] = 0;
 985         Matrix4x4_Transform(pixelstepmatrix, v, vertex3f);
 986         Matrix4x4_Transform(pixeltexturestepmatrix, v, tc);
 987         texcoord2f[0] = tc[0];
 988         texcoord2f[1] = tc[1];
 989 }
 990
 991 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)
 992 {
 993         float vup[3], vdown[3], vleft[3], vright[3];
 994         float tcup[3], tcdown[3], tcleft[3], tcright[3];
 995         float sv[3], tv[3], nl[3];
 996         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix, iy, vertex3f, texcoord2f, pixelstepmatrix, pixeltexturestepmatrix);
 997         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix, iy - 1, vup, tcup, pixelstepmatrix, pixeltexturestepmatrix);
 998         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix, iy + 1, vdown, tcdown, pixelstepmatrix, pixeltexturestepmatrix);
 999         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix - 1, iy, vleft, tcleft, pixelstepmatrix, pixeltexturestepmatrix);
1000         Mod_GetTerrainVertex3fTexCoord2fFromRGBA(imagepixels, imagewidth, imageheight, ix + 1, iy, vright, tcright, pixelstepmatrix, pixeltexturestepmatrix);
1001         Mod_BuildBumpVectors(vertex3f, vup, vright, texcoord2f, tcup, tcright, svector3f, tvector3f, normal3f);
1002         Mod_BuildBumpVectors(vertex3f, vright, vdown, texcoord2f, tcright, tcdown, sv, tv, nl);
1003         VectorAdd(svector3f, sv, svector3f);
1004         VectorAdd(tvector3f, tv, tvector3f);
1005         VectorAdd(normal3f, nl, normal3f);
1006         Mod_BuildBumpVectors(vertex3f, vdown, vleft, texcoord2f, tcdown, tcleft, sv, tv, nl);
1007         VectorAdd(svector3f, sv, svector3f);
1008         VectorAdd(tvector3f, tv, tvector3f);
1009         VectorAdd(normal3f, nl, normal3f);
1010         Mod_BuildBumpVectors(vertex3f, vleft, vup, texcoord2f, tcleft, tcup, sv, tv, nl);
1011         VectorAdd(svector3f, sv, svector3f);
1012         VectorAdd(tvector3f, tv, tvector3f);
1013         VectorAdd(normal3f, nl, normal3f);
1014 }
1015
1016 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)
1017 {
1018         int x, y, ix, iy, *e;
1019         e = element3i;
1020         for (y = 0;y < height;y++)
1021         {
1022                 for (x = 0;x < width;x++)
1023                 {
1024                         e[0] = (y + 1) * (width + 1) + (x + 0);
1025                         e[1] = (y + 0) * (width + 1) + (x + 0);
1026                         e[2] = (y + 1) * (width + 1) + (x + 1);
1027                         e[3] = (y + 0) * (width + 1) + (x + 0);
1028                         e[4] = (y + 0) * (width + 1) + (x + 1);
1029                         e[5] = (y + 1) * (width + 1) + (x + 1);
1030                         e += 6;
1031                 }
1032         }
1033         Mod_BuildTriangleNeighbors(neighbor3i, element3i, width*height*2);
1034         for (y = 0, iy = y1;y < height + 1;y++, iy++)
1035                 for (x = 0, ix = x1;x < width + 1;x++, ix++, vertex3f += 3, texcoord2f += 2, svector3f += 3, tvector3f += 3, normal3f += 3)
1036                         Mod_GetTerrainVertexFromRGBA(imagepixels, imagewidth, imageheight, ix, iy, vertex3f, texcoord2f, svector3f, tvector3f, normal3f, pixelstepmatrix, pixeltexturestepmatrix);
1037 }
1038
1039 skinfile_t *Mod_LoadSkinFiles(void)
1040 {
1041         int i, words, numtags, line, tagsetsused = false, wordsoverflow;
1042         char *text;
1043         const char *data;
1044         skinfile_t *skinfile = NULL, *first = NULL;
1045         skinfileitem_t *skinfileitem;
1046         char word[10][MAX_QPATH];
1047         overridetagnameset_t tagsets[MAX_SKINS];
1048         overridetagname_t tags[256];
1049
1050 /*
1051 sample file:
1052 U_bodyBox,models/players/Legoman/BikerA2.tga
1053 U_RArm,models/players/Legoman/BikerA1.tga
1054 U_LArm,models/players/Legoman/BikerA1.tga
1055 U_armor,common/nodraw
1056 U_sword,common/nodraw
1057 U_shield,common/nodraw
1058 U_homb,common/nodraw
1059 U_backpack,common/nodraw
1060 U_colcha,common/nodraw
1061 tag_head,
1062 tag_weapon,
1063 tag_torso,
1064 */
1065         memset(tagsets, 0, sizeof(tagsets));
1066         memset(word, 0, sizeof(word));
1067         for (i = 0;i < MAX_SKINS && (data = text = FS_LoadFile(va("%s_%i.skin", loadmodel->name, i), tempmempool, true));i++)
1068         {
1069                 numtags = 0;
1070
1071                 // If it's the first file we parse
1072                 if (skinfile == NULL)
1073                 {
1074                         skinfile = Mem_Alloc(tempmempool, sizeof(skinfile_t));
1075                         first = skinfile;
1076                 }
1077                 else
1078                 {
1079                         skinfile->next = Mem_Alloc(tempmempool, sizeof(skinfile_t));
1080                         skinfile = skinfile->next;
1081                 }
1082                 skinfile->next = NULL;
1083
1084                 for(line = 0;;line++)
1085                 {
1086                         // parse line
1087                         if (!COM_ParseToken(&data, true))
1088                                 break;
1089                         if (!strcmp(com_token, "\n"))
1090                                 continue;
1091                         words = 0;
1092                         wordsoverflow = false;
1093                         do
1094                         {
1095                                 if (words < 10)
1096                                         strlcpy(word[words++], com_token, sizeof (word[0]));
1097                                 else
1098                                         wordsoverflow = true;
1099                         }
1100                         while (COM_ParseToken(&data, true) && strcmp(com_token, "\n"));
1101                         if (wordsoverflow)
1102                         {
1103                                 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);
1104                                 continue;
1105                         }
1106                         // words is always >= 1
1107                         if (!strcmp(word[0], "replace"))
1108                         {
1109                                 if (words == 3)
1110                                 {
1111                                         Con_DPrintf("Mod_LoadSkinFiles: parsed mesh \"%s\" shader replacement \"%s\"\n", word[1], word[2]);
1112                                         skinfileitem = Mem_Alloc(tempmempool, sizeof(skinfileitem_t));
1113                                         skinfileitem->next = skinfile->items;
1114                                         skinfile->items = skinfileitem;
1115                                         strlcpy (skinfileitem->name, word[1], sizeof (skinfileitem->name));
1116                                         strlcpy (skinfileitem->replacement, word[2], sizeof (skinfileitem->replacement));
1117                                 }
1118                                 else
1119                                         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]);
1120                         }
1121                         else if (words == 2 && !strcmp(word[1], ","))
1122                         {
1123                                 // tag name, like "tag_weapon,"
1124                                 Con_DPrintf("Mod_LoadSkinFiles: parsed tag #%i \"%s\"\n", numtags, word[0]);
1125                                 memset(tags + numtags, 0, sizeof(tags[numtags]));
1126                                 strlcpy (tags[numtags].name, word[0], sizeof (tags[numtags].name));
1127                                 numtags++;
1128                         }
1129                         else if (words == 3 && !strcmp(word[1], ","))
1130                         {
1131                                 // mesh shader name, like "U_RArm,models/players/Legoman/BikerA1.tga"
1132                                 Con_DPrintf("Mod_LoadSkinFiles: parsed mesh \"%s\" shader replacement \"%s\"\n", word[0], word[2]);
1133                                 skinfileitem = Mem_Alloc(tempmempool, sizeof(skinfileitem_t));
1134                                 skinfileitem->next = skinfile->items;
1135                                 skinfile->items = skinfileitem;
1136                                 strlcpy (skinfileitem->name, word[0], sizeof (skinfileitem->name));
1137                                 strlcpy (skinfileitem->replacement, word[2], sizeof (skinfileitem->replacement));
1138                         }
1139                         else
1140                                 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);
1141                 }
1142                 Mem_Free(text);
1143
1144                 if (numtags)
1145                 {
1146                         overridetagnameset_t *t;
1147                         t = tagsets + i;
1148                         t->num_overridetagnames = numtags;
1149                         t->data_overridetagnames = Mem_Alloc(loadmodel->mempool, t->num_overridetagnames * sizeof(overridetagname_t));
1150                         memcpy(t->data_overridetagnames, tags, t->num_overridetagnames * sizeof(overridetagname_t));
1151                         tagsetsused = true;
1152                 }
1153         }
1154         if (tagsetsused)
1155         {
1156                 loadmodel->data_overridetagnamesforskin = Mem_Alloc(loadmodel->mempool, i * sizeof(overridetagnameset_t));
1157                 memcpy(loadmodel->data_overridetagnamesforskin, tagsets, i * sizeof(overridetagnameset_t));
1158         }
1159         if (i)
1160                 loadmodel->numskins = i;
1161         return first;
1162 }
1163
1164 void Mod_FreeSkinFiles(skinfile_t *skinfile)
1165 {
1166         skinfile_t *next;
1167         skinfileitem_t *skinfileitem, *nextitem;
1168         for (;skinfile;skinfile = next)
1169         {
1170                 next = skinfile->next;
1171                 for (skinfileitem = skinfile->items;skinfileitem;skinfileitem = nextitem)
1172                 {
1173                         nextitem = skinfileitem->next;
1174                         Mem_Free(skinfileitem);
1175                 }
1176                 Mem_Free(skinfile);
1177         }
1178 }
1179
1180 int Mod_CountSkinFiles(skinfile_t *skinfile)
1181 {
1182         int i;
1183         for (i = 0;skinfile;skinfile = skinfile->next, i++);
1184         return i;
1185 }
1186
1187 void Mod_SnapVertices(int numcomponents, int numvertices, float *vertices, float snap)
1188 {
1189         int i;
1190         double isnap = 1.0 / snap;
1191         for (i = 0;i < numvertices*numcomponents;i++)
1192                 vertices[i] = floor(vertices[i]*isnap)*snap;
1193 }
1194
1195 int Mod_RemoveDegenerateTriangles(int numtriangles, const int *inelement3i, int *outelement3i, const float *vertex3f)
1196 {
1197         int i, outtriangles;
1198         float d, edgedir[3], temp[3];
1199         // a degenerate triangle is one with no width (thickness, surface area)
1200         // these are characterized by having all 3 points colinear (along a line)
1201         // or having two points identical
1202         for (i = 0, outtriangles = 0;i < numtriangles;i++, inelement3i += 3)
1203         {
1204                 // calculate first edge
1205                 VectorSubtract(vertex3f + inelement3i[1] * 3, vertex3f + inelement3i[0] * 3, edgedir);
1206                 if (VectorLength2(edgedir) < 0.0001f)
1207                         continue; // degenerate first edge (no length)
1208                 VectorNormalize(edgedir);
1209                 // check if third point is on the edge (colinear)
1210                 d = -DotProduct(vertex3f + inelement3i[2] * 3, edgedir);
1211                 VectorMA(vertex3f + inelement3i[2] * 3, d, edgedir, temp);
1212                 if (VectorLength2(temp) < 0.0001f)
1213                         continue; // third point colinear with first edge
1214                 // valid triangle (no colinear points, no duplicate points)
1215                 VectorCopy(inelement3i, outelement3i);
1216                 outelement3i += 3;
1217                 outtriangles++;
1218         }
1219         return outtriangles;
1220 }
1221