gl_poly.c

   1 #include "quakedef.h"
   2
   3 transvert_t *transvert;
   4 transpoly_t *transpoly;
   5 unsigned short *transpolyindex;
   6 wallvert_t *wallvert;
   7 wallpoly_t *wallpoly;
   8 skyvert_t *skyvert;
   9 skypoly_t *skypoly;
  10
  11 unsigned short currenttranspoly;
  12 unsigned short currenttransvert;
  13 unsigned short currentwallpoly;
  14 unsigned short currentwallvert;
  15 unsigned short currentskypoly;
  16 unsigned short currentskyvert;
  17
  18 cvar_t gl_multitexture = {"gl_multitexture", "1"};
  19 cvar_t gl_vertexarrays = {"gl_vertexarrays", "1"};
  20
  21 typedef struct translistitem_s
  22 {
  23         transpoly_t *poly;
  24         struct translistitem_s *next;
  25 }
  26 translistitem;
  27
  28 translistitem translist[MAX_TRANSPOLYS];
  29 translistitem *currenttranslist;
  30
  31 translistitem *translisthash[4096];
  32
  33 float transviewdist; // distance of view origin along the view normal
  34
  35 float transreciptable[256];
  36
  37 void gl_poly_start()
  38 {
  39         int i;
  40         transvert = malloc(MAX_TRANSVERTS * sizeof(transvert_t));
  41         transpoly = malloc(MAX_TRANSPOLYS * sizeof(transpoly_t));
  42         transpolyindex = malloc(MAX_TRANSPOLYS * sizeof(unsigned short));
  43         wallvert = malloc(MAX_WALLVERTS * sizeof(wallvert_t));
  44         wallpoly = malloc(MAX_WALLPOLYS * sizeof(wallpoly_t));
  45         skyvert = malloc(MAX_SKYVERTS * sizeof(skyvert_t));
  46         skypoly = malloc(MAX_SKYPOLYS * sizeof(skypoly_t));
  47         transreciptable[0] = 0.0f;
  48         for (i = 1;i < 256;i++)
  49                 transreciptable[i] = 1.0f / i;
  50 }
  51 void gl_poly_shutdown()
  52 {
  53         free(transvert);
  54         free(transpoly);
  55         free(transpolyindex);
  56         free(wallvert);
  57         free(wallpoly);
  58         free(skyvert);
  59         free(skypoly);
  60 }
  61
  62 void GL_Poly_Init()
  63 {
  64         Cvar_RegisterVariable (&gl_multitexture);
  65         Cvar_RegisterVariable (&gl_vertexarrays);
  66         R_RegisterModule("GL_Poly", gl_poly_start, gl_poly_shutdown);
  67 }
  68
  69 void transpolyclear()
  70 {
  71         currenttranspoly = currenttransvert = 0;
  72         currenttranslist = translist;
  73         memset(translisthash, 0, sizeof(translisthash));
  74         transviewdist = DotProduct(r_refdef.vieworg, vpn);
  75 }
  76
  77 // turned into a #define
  78 /*
  79 void transpolybegin(int texnum, int glowtexnum, int fogtexnum, int transpolytype)
  80 {
  81         if (currenttranspoly >= MAX_TRANSPOLYS || currenttransvert >= MAX_TRANSVERTS)
  82                 return;
  83         transpoly[currenttranspoly].texnum = (unsigned short) texnum;
  84         transpoly[currenttranspoly].glowtexnum = (unsigned short) glowtexnum;
  85         transpoly[currenttranspoly].fogtexnum = (unsigned short) fogtexnum;
  86         transpoly[currenttranspoly].transpolytype = (unsigned short) transpolytype;
  87         transpoly[currenttranspoly].firstvert = currenttransvert;
  88         transpoly[currenttranspoly].verts = 0;
  89 //      transpoly[currenttranspoly].ndist = 0; // clear the normal
  90 }
  91 */
  92
  93 // turned into a #define
  94 /*
  95 void transpolyvert(float x, float y, float z, float s, float t, int r, int g, int b, int a)
  96 {
  97         int i;
  98         if (currenttranspoly >= MAX_TRANSPOLYS || currenttransvert >= MAX_TRANSVERTS)
  99                 return;
 100         transvert[currenttransvert].s = s;
 101         transvert[currenttransvert].t = t;
 102         transvert[currenttransvert].r = bound(0, r, 255);
 103         transvert[currenttransvert].g = bound(0, g, 255);
 104         transvert[currenttransvert].b = bound(0, b, 255);
 105         transvert[currenttransvert].a = bound(0, a, 255);
 106         transvert[currenttransvert].v[0] = x;
 107         transvert[currenttransvert].v[1] = y;
 108         transvert[currenttransvert].v[2] = z;
 109         currenttransvert++;
 110         transpoly[currenttranspoly].verts++;
 111 }
 112 */
 113
 114 void transpolyend()
 115 {
 116         float center, d, maxdist;
 117         int i;
 118         transvert_t *v;
 119         if (currenttranspoly >= MAX_TRANSPOLYS || currenttransvert >= MAX_TRANSVERTS)
 120                 return;
 121         if (transpoly[currenttranspoly].verts < 3) // skip invalid polygons
 122         {
 123                 currenttransvert = transpoly[currenttranspoly].firstvert; // reset vert pointer
 124                 return;
 125         }
 126         center = 0;
 127         maxdist = -1000000000000000.0f; // eh, it's definitely behind it, so...
 128         for (i = 0,v = &transvert[transpoly[currenttranspoly].firstvert];i < transpoly[currenttranspoly].verts;i++, v++)
 129         {
 130                 d = DotProduct(v->v, vpn);
 131                 center += d;
 132                 if (d > maxdist)
 133                         maxdist = d;
 134         }
 135         maxdist -= transviewdist;
 136         if (maxdist < 4.0f) // behind view
 137         {
 138                 currenttransvert = transpoly[currenttranspoly].firstvert; // reset vert pointer
 139                 return;
 140         }
 141         center *= transreciptable[transpoly[currenttranspoly].verts];
 142         center -= transviewdist;
 143         i = bound(0, (int) center, 4095);
 144         currenttranslist->next = translisthash[i];
 145         currenttranslist->poly = transpoly + currenttranspoly;
 146         translisthash[i] = currenttranslist;
 147         currenttranslist++;
 148         currenttranspoly++;
 149 }
 150
 151 int transpolyindices;
 152 extern qboolean isG200;
 153
 154 /*
 155 void transpolyrenderminmax()
 156 {
 157         int i, j, k, lastvert;
 158         vec_t d, min, max, viewdist, s, average;
 159         //vec_t ndist;
 160         //vec3_t v1, v2, n;
 161         transpolyindices = 0;
 162         viewdist = DotProduct(r_refdef.vieworg, vpn);
 163         for (i = 0;i < currenttranspoly;i++)
 164         {
 165                 if (transpoly[i].verts < 3) // only process valid polygons
 166                         continue;
 167                 min = 1000000;max = -1000000;
 168                 s = 1.0f / transpoly[i].verts;
 169                 lastvert = transpoly[i].firstvert + transpoly[i].verts;
 170                 average = 0;
 171                 for (j = transpoly[i].firstvert;j < lastvert;j++)
 172                 {
 173                         d = DotProduct(transvert[j].v, vpn)-viewdist;
 174                         if (d < min) min = d;
 175                         if (d > max) max = d;
 176                         average += d * s;
 177                 }
 178                 if (max < 4) // free to check here, so skip polys behind the view
 179                         continue;
 180                 transpoly[i].distance = average;
 181 */
 182                 /*
 183                 transpoly[i].mindistance = min;
 184                 transpoly[i].maxdistance = max;
 185                 // calculate normal (eek)
 186                 VectorSubtract(transvert[transpoly[i].firstvert  ].v, transvert[transpoly[i].firstvert+1].v, v1);
 187                 VectorSubtract(transvert[transpoly[i].firstvert+2].v, transvert[transpoly[i].firstvert+1].v, v2);
 188                 VectorNormalize(v1);
 189                 VectorNormalize(v2);
 190                 if (transpoly[i].verts > 3 && fabs(DotProduct(v1, v2)) >= (1.0f - (1.0f / 256.0f))) // colinear edges, find a better triple
 191                 {
 192                         VectorSubtract(transvert[transpoly[i].firstvert + transpoly[i].verts - 1].v, transvert[transpoly[i].firstvert].v, v1);
 193                         VectorSubtract(transvert[transpoly[i].firstvert + 1].v, transvert[transpoly[i].firstvert].v, v2);
 194                         VectorNormalize(v1);
 195                         VectorNormalize(v2);
 196                         if (fabs(DotProduct(v1, v2)) < (1.0f - (1.0f / 256.0f))) // found a good triple
 197                                 goto foundtriple;
 198                         for (k = transpoly[i].firstvert + 2;k < (transpoly[i].firstvert + transpoly[i].verts - 1);k++)
 199                         {
 200                                 VectorSubtract(transvert[k-1].v, transvert[k].v, v1);
 201                                 VectorSubtract(transvert[k+1].v, transvert[k].v, v2);
 202                                 VectorNormalize(v1);
 203                                 VectorNormalize(v2);
 204                                 if (fabs(DotProduct(v1, v2)) < (1.0f - (1.0f / 256.0f))) // found a good triple
 205                                         goto foundtriple;
 206                         }
 207                         VectorSubtract(transvert[k-1].v, transvert[k].v, v1);
 208                         VectorSubtract(transvert[transpoly[i].firstvert].v, transvert[k].v, v2);
 209                         VectorNormalize(v1);
 210                         VectorNormalize(v2);
 211                         if (fabs(DotProduct(v1, v2)) >= (1.0f - (1.0f / 256.0f))) // no good triples; the polygon is a line, skip it
 212                                 continue;
 213                 }
 214 foundtriple:
 215                 CrossProduct(v1, v2, n);
 216                 VectorNormalize(n);
 217                 ndist = DotProduct(transvert[transpoly[i].firstvert+1].v, n);
 218                 // sorted insert
 219                 for (j = 0;j < transpolyindices;j++)
 220                 {
 221                         // easy cases
 222                         if (transpoly[transpolyindex[j]].mindistance > max)
 223                                 continue;
 224                         if (transpoly[transpolyindex[j]].maxdistance < min)
 225                                 break;
 226                         // hard case, check side
 227                         for (k = transpoly[transpolyindex[j]].firstvert;k < (transpoly[transpolyindex[j]].firstvert + transpoly[transpolyindex[j]].verts);k++)
 228                                 if (DotProduct(transvert[k].v, n) < ndist)
 229                                         goto skip;
 230                         break;
 231 skip:
 232                         ;
 233                 }
 234                 */
 235 /*
 236                 // sorted insert
 237                 for (j = 0;j < transpolyindices;j++)
 238                         if (transpoly[transpolyindex[j]].distance < average)
 239                                 break;
 240                 for (k = transpolyindices;k > j;k--)
 241                         transpolyindex[k] = transpolyindex[k-1];
 242                 transpolyindices++;
 243                 transpolyindex[j] = i;
 244         }
 245 }
 246 */
 247 /*
 248 // LordHavoc: qsort compare function
 249 int transpolyqsort(const void *ia, const void *ib)
 250 {
 251         transpoly_t *a, *b;
 252         int i, j;
 253         a = &transpoly[*((unsigned short *)ia)];
 254         b = &transpoly[*((unsigned short *)ib)];
 255         // easy cases
 256         if (a->mindistance > b->mindistance && a->maxdistance > b->maxdistance)
 257                 return -1; // behind
 258         if (a->mindistance < b->mindistance && a->maxdistance < b->maxdistance)
 259                 return 1; // infront
 260         // hard case
 261         if (!a->ndist)
 262         {
 263                 // calculate normal (eek)
 264                 vec3_t v1, v2;
 265                 VectorSubtract(transvert[a->firstvert  ].v, transvert[a->firstvert+1].v, v1);
 266                 VectorSubtract(transvert[a->firstvert+2].v, transvert[a->firstvert+1].v, v2);
 267                 CrossProduct(v1, v2, a->n);
 268                 VectorNormalize(a->n);
 269                 a->ndist = DotProduct(transvert[a->firstvert  ].v, a->n);
 270         }
 271         // check side
 272         for (i = b->firstvert, j = 0;i < (b->firstvert + b->verts);i++)
 273                 j += DotProduct(transvert[i].v, a->n) < a->ndist; // (1) b is infront of a
 274         if (j == 0)
 275                 return -1; // (-1) a is behind b
 276         return j == b->verts; // (1) a is infront of b    (0) a and b intersect
 277 //      return (transpoly[*((unsigned short *)ib)].mindistance + transpoly[*((unsigned short *)ib)].maxdistance) - (transpoly[*((unsigned short *)ia)].mindistance + transpoly[*((unsigned short *)ia)].maxdistance);
 278         */
 279 /*
 280         return ((transpoly_t*)ia)->distance - ((transpoly_t*)ib)->distance;
 281 }
 282 */
 283
 284 /*
 285 int transpolyqsort(const void *ia, const void *ib)
 286 {
 287         return (transpoly[*((unsigned short *)ib)].distance - transpoly[*((unsigned short *)ia)].distance);
 288 }
 289 */
 290
 291 /*
 292 void transpolyrenderminmax()
 293 {
 294         int i, j, lastvert;
 295         vec_t d, max, viewdist, average;
 296         transpolyindices = 0;
 297         viewdist = DotProduct(r_refdef.vieworg, vpn);
 298         for (i = 0;i < currenttranspoly;i++)
 299         {
 300                 if (transpoly[i].verts < 3) // only process valid polygons
 301                         continue;
 302                 max = -1000000;
 303                 lastvert = transpoly[i].firstvert + transpoly[i].verts;
 304                 average = 0;
 305                 for (j = transpoly[i].firstvert;j < lastvert;j++)
 306                 {
 307                         d = DotProduct(transvert[j].v, vpn)-viewdist;
 308                         average += d;
 309                         if (d > max)
 310                                 max = d;
 311                 }
 312                 if (max < 4) // free to check here, so skip polys behind the view
 313                         continue;
 314                 transpoly[i].distance = average / transpoly[i].verts;
 315                 transpolyindex[transpolyindices++] = i;
 316         }
 317         qsort(&transpolyindex[0], transpolyindices, sizeof(unsigned short), transpolyqsort);
 318 }
 319 */
 320 /*
 321         int i, j, a;
 322         a = true;
 323         while(a)
 324         {
 325                 a = false;
 326                 for (i = 1;i < transpolyindices;i++)
 327                 {
 328                         // easy cases
 329                         if (transpoly[transpolyindex[i - 1]].mindistance > transpoly[transpolyindex[i]].mindistance && transpoly[transpolyindex[i - 1]].maxdistance > transpoly[transpolyindex[i]].maxdistance)
 330                                 continue; // previous is behind (no swap)
 331                         if (transpoly[transpolyindex[i - 1]].mindistance < transpoly[transpolyindex[i]].mindistance && transpoly[transpolyindex[i - 1]].maxdistance < transpoly[transpolyindex[i]].maxdistance)
 332                                 goto swap; // previous is infront (swap)
 333                         // hard case
 334 */
 335                         /*
 336                         if (!transpoly[transpolyindex[i - 1]].ndist)
 337                         {
 338                                 // calculate normal (eek)
 339                                 vec3_t v1, v2;
 340                                 VectorSubtract(transvert[transpoly[transpolyindex[i - 1]].firstvert  ].v, transvert[transpoly[transpolyindex[i - 1]].firstvert+1].v, v1);
 341                                 VectorSubtract(transvert[transpoly[transpolyindex[i - 1]].firstvert+2].v, transvert[transpoly[transpolyindex[i - 1]].firstvert+1].v, v2);
 342                                 CrossProduct(v1, v2, transpoly[transpolyindex[i - 1]].n);
 343                                 VectorNormalize(transpoly[transpolyindex[i - 1]].n);
 344                                 transpoly[transpolyindex[i - 1]].ndist = DotProduct(transvert[transpoly[transpolyindex[i - 1]].firstvert  ].v, transpoly[transpolyindex[i - 1]].n);
 345                         }
 346                         if (DotProduct(transpoly[transpolyindex[i - 1]].n, vpn) >= 0.0f) // backface
 347                                 continue;
 348                         */
 349 /*
 350                         // check side
 351                         for (i = transpoly[transpolyindex[i]].firstvert;i < (transpoly[transpolyindex[i]].firstvert + transpoly[transpolyindex[i]].verts);i++)
 352                                 if (DotProduct(transvert[i].v, transpoly[transpolyindex[i - 1]].n) >= transpoly[transpolyindex[i - 1]].ndist)
 353                                         goto noswap; // previous is behind or they intersect
 354 swap:
 355                         // previous is infront (swap)
 356                         j = transpolyindex[i];
 357                         transpolyindex[i] = transpolyindex[i - 1];
 358                         transpolyindex[i - 1] = j;
 359                         a = true;
 360 noswap:
 361                         ;
 362                 }
 363         }
 364 }
 365 */
 366
 367 void transpolyrender()
 368 {
 369         int i, j, tpolytype, texnum;
 370         transpoly_t *p;
 371         if (!r_render.value)
 372                 return;
 373         if (currenttranspoly < 1)
 374                 return;
 375 //      transpolyrenderminmax();
 376 //      if (transpolyindices < 1)
 377 //              return;
 378         // testing
 379 //      Con_DPrintf("transpolyrender: %i polys %i infront %i vertices\n", currenttranspoly, transpolyindices, currenttransvert);
 380 //      if (transpolyindices >= 2)
 381 //              transpolysort();
 382         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 383         glEnable(GL_BLEND);
 384         glShadeModel(GL_SMOOTH);
 385         glDepthMask(0); // disable zbuffer updates
 386         if (isG200) // Matrox G200 cards can't handle per pixel alpha
 387                 glEnable(GL_ALPHA_TEST);
 388         else
 389                 glDisable(GL_ALPHA_TEST);
 390         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 391         tpolytype = TPOLYTYPE_ALPHA;
 392         texnum = -1;
 393         /*
 394         if (gl_vertexarrays.value)
 395         {
 396                 // set up the vertex array
 397                 qglInterleavedArrays(GL_T2F_C4UB_V3F, 0, transvert);
 398                 for (i = 0;i < transpolyindices;i++)
 399                 {
 400                         p = &transpoly[transpolyindex[i]];
 401                         if (p->texnum != texnum || p->transpolytype != tpolytype)
 402                         {
 403                                 if (p->texnum != texnum)
 404                                 {
 405                                         texnum = p->texnum;
 406                                         glBindTexture(GL_TEXTURE_2D, texnum);
 407                                 }
 408                                 if (p->transpolytype != tpolytype)
 409                                 {
 410                                         tpolytype = p->transpolytype;
 411                                         if (tpolytype == TPOLYTYPE_ADD) // additive
 412                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 413                                         else // alpha
 414                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 415                                 }
 416                         }
 417                         qglDrawArrays(GL_TRIANGLE_FAN, p->firstvert, p->verts);
 418                         if (p->glowtexnum)
 419                         {
 420                                 texnum = p->glowtexnum; // highly unlikely to match next poly, but...
 421                                 glBindTexture(GL_TEXTURE_2D, texnum);
 422                                 tpolytype = TPOLYTYPE_ADD; // might match next poly
 423                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 424                                 qglDrawArrays(GL_TRIANGLE_FAN, p->firstvert, p->verts);
 425                         }
 426                 }
 427                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 428                 glDisableClientState(GL_COLOR_ARRAY);
 429                 glDisableClientState(GL_VERTEX_ARRAY);
 430         }
 431         else
 432         */
 433         {
 434                 int points = -1;
 435                 translistitem *item;
 436                 transvert_t *vert;
 437                 for (i = 4095;i >= 0;i--)
 438                 {
 439                         item = translisthash[i];
 440                         while (item)
 441                         {
 442                                 p = item->poly;
 443                                 item = item->next;
 444                                 if (p->texnum != texnum || p->verts != points || p->transpolytype != tpolytype)
 445                                 {
 446                                         glEnd();
 447                                         if (isG200)
 448                                         {
 449                                                 if (p->fogtexnum) // alpha
 450                                                         glEnable(GL_ALPHA_TEST);
 451                                                 else
 452                                                         glDisable(GL_ALPHA_TEST);
 453                                         }
 454                                         if (p->texnum != texnum)
 455                                         {
 456                                                 texnum = p->texnum;
 457                                                 glBindTexture(GL_TEXTURE_2D, texnum);
 458                                         }
 459                                         if (p->transpolytype != tpolytype)
 460                                         {
 461                                                 tpolytype = p->transpolytype;
 462                                                 if (tpolytype == TPOLYTYPE_ADD) // additive
 463                                                         glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 464                                                 else // alpha
 465                                                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 466                                         }
 467                                         points = p->verts;
 468                                         switch (points)
 469                                         {
 470                                         case 3:
 471                                                 glBegin(GL_TRIANGLES);
 472                                                 break;
 473                                         case 4:
 474                                                 glBegin(GL_QUADS);
 475                                                 break;
 476                                         default:
 477                                                 glBegin(GL_TRIANGLE_FAN);
 478                                                 points = -1; // to force a reinit on the next poly
 479                                                 break;
 480                                         }
 481                                 }
 482                                 for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 483                                 {
 484                                         // would be 2fv, but windoze Matrox G200 and probably G400 drivers don't support that (dumb...)
 485                                         glTexCoord2f(vert->s, vert->t);
 486                                         // again, vector version isn't supported I think
 487                                         glColor4ub(vert->r, vert->g, vert->b, vert->a);
 488                                         glVertex3fv(vert->v);
 489                                 }
 490                                 if (p->glowtexnum)
 491                                 {
 492                                         glEnd();
 493                                         texnum = p->glowtexnum; // highly unlikely to match next poly, but...
 494                                         glBindTexture(GL_TEXTURE_2D, texnum);
 495                                         if (tpolytype != TPOLYTYPE_ADD)
 496                                         {
 497                                                 tpolytype = TPOLYTYPE_ADD; // might match next poly
 498                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 499                                         }
 500                                         points = -1;
 501                                         glBegin(GL_TRIANGLE_FAN);
 502                                         for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 503                                         {
 504                                                 glColor4ub(255,255,255,vert->a);
 505                                                 // would be 2fv, but windoze Matrox G200 and probably G400 drivers don't support that (dumb...)
 506                                                 glTexCoord2f(vert->s, vert->t);
 507                                                 glVertex3fv(vert->v);
 508                                         }
 509                                         glEnd();
 510                                 }
 511                                 if (fogenabled && p->transpolytype == TPOLYTYPE_ALPHA)
 512                                 {
 513                                         vec3_t diff;
 514                                         glEnd();
 515                                         points = -1; // to force a reinit on the next poly
 516                                         if (tpolytype != TPOLYTYPE_ALPHA)
 517                                         {
 518                                                 tpolytype = TPOLYTYPE_ALPHA; // probably matchs next poly
 519                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 520                                         }
 521                                         if (p->fogtexnum)
 522                                         {
 523                                                 if (texnum != p->fogtexnum) // highly unlikely to match next poly, but...
 524                                                 {
 525                                                         texnum = p->fogtexnum;
 526                                                         glBindTexture(GL_TEXTURE_2D, texnum);
 527                                                 }
 528                                                 glBegin(GL_TRIANGLE_FAN);
 529                                                 for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 530                                                 {
 531                                                         VectorSubtract(vert->v, r_refdef.vieworg,diff);
 532                                                         glTexCoord2f(vert->s, vert->t);
 533                                                         glColor4f(fogcolor[0], fogcolor[1], fogcolor[2], vert->a*(1.0f/255.0f)*exp(fogdensity/DotProduct(diff,diff)));
 534                                                         glVertex3fv(vert->v);
 535                                                 }
 536                                                 glEnd ();
 537                                         }
 538                                         else
 539                                         {
 540                                                 glDisable(GL_TEXTURE_2D);
 541                                                 glBegin(GL_TRIANGLE_FAN);
 542                                                 for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 543                                                 {
 544                                                         VectorSubtract(vert->v, r_refdef.vieworg,diff);
 545                                                         glColor4f(fogcolor[0], fogcolor[1], fogcolor[2], vert->a*(1.0f/255.0f)*exp(fogdensity/DotProduct(diff,diff)));
 546                                                         glVertex3fv(vert->v);
 547                                                 }
 548                                                 glEnd ();
 549                                                 glEnable(GL_TEXTURE_2D);
 550                                         }
 551                                 }
 552                         }
 553                 }
 554                 glEnd();
 555         }
 556
 557         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 558         glDepthMask(1); // enable zbuffer updates
 559         glDisable(GL_ALPHA_TEST);
 560 }
 561
 562 extern qboolean isG200;
 563
 564 void wallpolyclear()
 565 {
 566         currentwallpoly = currentwallvert = 0;
 567 }
 568
 569 extern qboolean lighthalf;
 570 void wallpolyrender()
 571 {
 572         int i, j, texnum, lighttexnum;
 573         wallpoly_t *p;
 574         wallvert_t *vert;
 575         if (!r_render.value)
 576                 return;
 577         if (currentwallpoly < 1)
 578                 return;
 579         c_brush_polys += currentwallpoly;
 580         // testing
 581         //Con_DPrintf("wallpolyrender: %i polys %i vertices\n", currentwallpoly, currentwallvert);
 582         if (!gl_mtexable)
 583                 gl_multitexture.value = 0;
 584         glDisable(GL_BLEND);
 585         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 586         glShadeModel(GL_FLAT);
 587         // make sure zbuffer is enabled
 588         glEnable(GL_DEPTH_TEST);
 589         glDisable(GL_ALPHA_TEST);
 590         glDepthMask(1);
 591         glColor3f(1,1,1);
 592         if (r_fullbright.value) // LordHavoc: easy to do fullbright...
 593         {
 594                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 595                 texnum = -1;
 596                 for (i = 0,p = wallpoly;i < currentwallpoly;i++, p++)
 597                 {
 598                         if (p->texnum != texnum)
 599                         {
 600                                 texnum = p->texnum;
 601                                 glBindTexture(GL_TEXTURE_2D, texnum);
 602                         }
 603                         vert = &wallvert[p->firstvert];
 604                         glBegin(GL_POLYGON);
 605                         for (j=0 ; j<p->numverts ; j++, vert++)
 606                         {
 607                                 glTexCoord2f (vert->s, vert->t);
 608                                 glVertex3fv (vert->vert);
 609                         }
 610                         glEnd ();
 611                 }
 612         }
 613         else if (gl_multitexture.value)
 614         {
 615                 qglSelectTexture(gl_mtex_enum+0);
 616                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 617                 glEnable(GL_TEXTURE_2D);
 618                 qglSelectTexture(gl_mtex_enum+1);
 619                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 620                 glEnable(GL_TEXTURE_2D);
 621                 texnum = -1;
 622                 lighttexnum = -1;
 623                 for (i = 0,p = wallpoly;i < currentwallpoly;i++, p++)
 624                 {
 625                         if (p->texnum != texnum || p->lighttexnum != lighttexnum)
 626                         {
 627                                 texnum = p->texnum;
 628                                 lighttexnum = p->lighttexnum;
 629                                 qglSelectTexture(gl_mtex_enum+0);
 630                                 glBindTexture(GL_TEXTURE_2D, texnum);
 631                                 qglSelectTexture(gl_mtex_enum+1);
 632                                 glBindTexture(GL_TEXTURE_2D, lighttexnum);
 633                         }
 634                         vert = &wallvert[p->firstvert];
 635                         glBegin(GL_POLYGON);
 636                         for (j=0 ; j<p->numverts ; j++, vert++)
 637                         {
 638                                 qglMTexCoord2f(gl_mtex_enum, vert->s, vert->t); // texture
 639                                 qglMTexCoord2f((gl_mtex_enum+1), vert->u, vert->v); // lightmap
 640                                 glVertex3fv (vert->vert);
 641                         }
 642                         glEnd ();
 643                 }
 644
 645                 qglSelectTexture(gl_mtex_enum+1);
 646                 glDisable(GL_TEXTURE_2D);
 647                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 648                 qglSelectTexture(gl_mtex_enum+0);
 649                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 650         }
 651         else
 652         {
 653                 // first do the textures
 654                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 655                 texnum = -1;
 656                 for (i = 0,p = wallpoly;i < currentwallpoly;i++, p++)
 657                 {
 658                         if (p->texnum != texnum)
 659                         {
 660                                 texnum = p->texnum;
 661                                 glBindTexture(GL_TEXTURE_2D, texnum);
 662                         }
 663                         vert = &wallvert[p->firstvert];
 664                         glBegin(GL_POLYGON);
 665                         for (j=0 ; j<p->numverts ; j++, vert++)
 666                         {
 667                                 glTexCoord2f (vert->s, vert->t);
 668                                 glVertex3fv (vert->vert);
 669                         }
 670                         glEnd ();
 671                 }
 672                 // then modulate using the lightmaps
 673                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 674                 glBlendFunc(GL_ZERO, GL_SRC_COLOR);
 675                 glEnable(GL_BLEND);
 676                 texnum = -1;
 677                 for (i = 0,p = wallpoly;i < currentwallpoly;i++, p++)
 678                 {
 679                         if (p->lighttexnum != texnum)
 680                         {
 681                                 texnum = p->lighttexnum;
 682                                 glBindTexture(GL_TEXTURE_2D, texnum);
 683                         }
 684                         vert = &wallvert[p->firstvert];
 685                         glBegin(GL_POLYGON);
 686                         for (j=0 ; j<p->numverts ; j++, vert++)
 687                         {
 688                                 glTexCoord2f (vert->u, vert->v);
 689                                 glVertex3fv (vert->vert);
 690                         }
 691                         glEnd ();
 692                 }
 693         }
 694         // switch to additive mode settings
 695         glDepthMask(0);
 696         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 697         glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 698         glEnable(GL_BLEND);
 699         glDisable(GL_ALPHA_TEST);
 700         glShadeModel(GL_SMOOTH);
 701         // render vertex lit overlays ontop
 702         texnum = -1;
 703         for (i = 0, p = wallpoly;i < currentwallpoly;i++, p++)
 704         {
 705                 if (!p->lit)
 706                         continue;
 707                 for (j = 0,vert = &wallvert[p->firstvert];j < p->numverts;j++, vert++)
 708                         if (vert->r || vert->g || vert->b)
 709                                 goto lit;
 710                 continue;
 711 lit:
 712                 c_light_polys++;
 713                 if (p->texnum != texnum)
 714                 {
 715                         texnum = p->texnum;
 716                         glBindTexture(GL_TEXTURE_2D, texnum);
 717                 }
 718                 glBegin(GL_POLYGON);
 719                 for (j = 0,vert = &wallvert[p->firstvert];j < p->numverts;j++, vert++)
 720                 {
 721                         // would be 2fv, but windoze Matrox G200 and probably G400 drivers don't support that (dumb...)
 722                         glTexCoord2f(vert->s, vert->t);
 723                         // again, vector version isn't supported I think
 724                         glColor3ub(vert->r, vert->g, vert->b);
 725                         glVertex3fv(vert->vert);
 726                 }
 727                 glEnd();
 728         }
 729         // render glow textures
 730         glShadeModel(GL_FLAT);
 731         glBlendFunc(GL_ONE, GL_ONE);
 732         if (lighthalf)
 733                 glColor3f(0.5,0.5,0.5);
 734         else
 735                 glColor3f(1,1,1);
 736         texnum = -1;
 737         for (i = 0,p = wallpoly;i < currentwallpoly;i++, p++)
 738         {
 739                 if (!p->glowtexnum)
 740                         continue;
 741                 if (p->glowtexnum != texnum)
 742                 {
 743                         texnum = p->glowtexnum;
 744                         glBindTexture(GL_TEXTURE_2D, texnum);
 745                 }
 746                 vert = &wallvert[p->firstvert];
 747                 glBegin(GL_POLYGON);
 748                 for (j=0 ; j<p->numverts ; j++, vert++)
 749                 {
 750                         glTexCoord2f (vert->s, vert->t);
 751                         glVertex3fv (vert->vert);
 752                 }
 753                 glEnd();
 754         }
 755         glColor3f(1,1,1);
 756         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 757         glShadeModel(GL_SMOOTH);
 758         if (fogenabled)
 759         {
 760                 vec3_t diff;
 761                 glDisable(GL_TEXTURE_2D);
 762                 for (i = 0,p = &wallpoly[0];i < currentwallpoly;i++, p++)
 763                 {
 764                         vert = &wallvert[p->firstvert];
 765                         glBegin(GL_POLYGON);
 766                         for (j=0 ; j<p->numverts ; j++, vert++)
 767                         {
 768                                 VectorSubtract(vert->vert, r_refdef.vieworg,diff);
 769                                 glColor4f(fogcolor[0], fogcolor[1], fogcolor[2], exp(fogdensity/DotProduct(diff,diff)));
 770                                 glVertex3fv (vert->vert);
 771                         }
 772                         glEnd ();
 773                 }
 774                 glEnable(GL_TEXTURE_2D);
 775         }
 776         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 777         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 778         glDisable(GL_ALPHA_TEST);
 779         glShadeModel(GL_SMOOTH);
 780         glDisable(GL_BLEND);
 781         glDepthMask(1);
 782 }
 783
 784 void skypolyclear()
 785 {
 786         currentskypoly = currentskyvert = 0;
 787 }
 788
 789 extern qboolean isATI;
 790
 791 extern char skyname[];
 792 extern int solidskytexture, alphaskytexture;
 793 void skypolyrender()
 794 {
 795         int i, j;
 796         skypoly_t *p;
 797         skyvert_t *vert;
 798         float length, speedscale;
 799         vec3_t dir;
 800         if (!r_render.value)
 801                 return;
 802         if (currentskypoly < 1)
 803                 return;
 804         // testing
 805 //      Con_DPrintf("skypolyrender: %i polys %i vertices\n", currentskypoly, currentskyvert);
 806         glDisable(GL_ALPHA_TEST);
 807         glDisable(GL_BLEND);
 808         // make sure zbuffer is enabled
 809         glEnable(GL_DEPTH_TEST);
 810         glDepthMask(1);
 811         if (!fogenabled && !skyname[0]) // normal quake sky
 812         {
 813                 glColor3f(0.5f, 0.5f, 0.5f);
 814                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 815                 glEnable(GL_TEXTURE_2D);
 816                 glDisable(GL_BLEND);
 817                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 818                 glBindTexture(GL_TEXTURE_2D, solidskytexture); // upper clouds
 819                 speedscale = realtime*8;
 820                 speedscale -= (int)speedscale & ~127 ;
 821                 for (i = 0,p = &skypoly[0];i < currentskypoly;i++, p++)
 822                 {
 823                         vert = &skyvert[p->firstvert];
 824                         glBegin(GL_POLYGON);
 825                         for (j=0 ; j<p->verts ; j++, vert++)
 826                         {
 827                                 VectorSubtract (vert->v, r_origin, dir);
 828                                 dir[2] *= 3;    // flatten the sphere
 829
 830                                 length = dir[0]*dir[0] + dir[1]*dir[1] + dir[2]*dir[2];
 831                                 length = sqrt (length);
 832                                 length = 6*63/length;
 833
 834                                 glTexCoord2f ((speedscale + dir[0] * length) * (1.0/128), (speedscale + dir[1] * length) * (1.0/128));
 835                                 glVertex3fv (vert->v);
 836                         }
 837                         glEnd ();
 838                 }
 839                 glEnable(GL_BLEND);
 840                 glDepthMask(0);
 841                 glBindTexture(GL_TEXTURE_2D, alphaskytexture); // lower clouds
 842                 speedscale = realtime*16;
 843                 speedscale -= (int)speedscale & ~127 ;
 844                 for (i = 0,p = &skypoly[0];i < currentskypoly;i++, p++)
 845                 {
 846                         vert = &skyvert[p->firstvert];
 847                         glBegin(GL_POLYGON);
 848                         for (j=0 ; j<p->verts ; j++, vert++)
 849                         {
 850                                 VectorSubtract (vert->v, r_origin, dir);
 851                                 dir[2] *= 3;    // flatten the sphere
 852
 853                                 length = dir[0]*dir[0] + dir[1]*dir[1] + dir[2]*dir[2];
 854                                 length = sqrt (length);
 855                                 length = 6*63/length;
 856
 857                                 glTexCoord2f ((speedscale + dir[0] * length) * (1.0/128), (speedscale + dir[1] * length) * (1.0/128));
 858                                 glVertex3fv (vert->v);
 859                         }
 860                         glEnd ();
 861                 }
 862                 glDisable(GL_BLEND);
 863                 glColor3f(1,1,1);
 864                 glDepthMask(1);
 865         }
 866         else
 867         {
 868                 glDisable(GL_TEXTURE_2D);
 869                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 870                 glColor3fv(fogcolor); // note: gets rendered over by skybox if fog is not enabled
 871                 for (i = 0,p = &skypoly[0];i < currentskypoly;i++, p++)
 872                 {
 873                         vert = &skyvert[p->firstvert];
 874                         glBegin(GL_POLYGON);
 875                         for (j=0 ; j<p->verts ; j++, vert++)
 876                                 glVertex3fv (vert->v);
 877                         glEnd ();
 878                 }
 879                 glColor3f(1,1,1);
 880                 glEnable(GL_TEXTURE_2D);
 881         }
 882 }