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 void glpoly_init()
  22 {
  23         Cvar_RegisterVariable (&gl_multitexture);
  24         Cvar_RegisterVariable (&gl_vertexarrays);
  25         transvert = malloc(MAX_TRANSVERTS * sizeof(transvert_t));
  26         transpoly = malloc(MAX_TRANSPOLYS * sizeof(transpoly_t));
  27         transpolyindex = malloc(MAX_TRANSPOLYS * sizeof(unsigned short));
  28         wallvert = malloc(MAX_WALLVERTS * sizeof(wallvert_t));
  29         wallpoly = malloc(MAX_WALLPOLYS * sizeof(wallpoly_t));
  30         skyvert = malloc(MAX_SKYVERTS * sizeof(skyvert_t));
  31         skypoly = malloc(MAX_SKYPOLYS * sizeof(skypoly_t));
  32 }
  33
  34 void transpolyclear()
  35 {
  36         currenttranspoly = currenttransvert = 0;
  37 }
  38
  39 void transpolybegin(int texnum, int glowtexnum, int fogtexnum, int transpolytype)
  40 {
  41         if (currenttranspoly >= MAX_TRANSPOLYS || currenttransvert >= MAX_TRANSVERTS)
  42                 return;
  43         transpoly[currenttranspoly].texnum = (unsigned short) texnum;
  44         transpoly[currenttranspoly].glowtexnum = (unsigned short) glowtexnum;
  45         transpoly[currenttranspoly].fogtexnum = (unsigned short) fogtexnum;
  46         transpoly[currenttranspoly].transpolytype = (unsigned short) transpolytype;
  47         transpoly[currenttranspoly].firstvert = currenttransvert;
  48         transpoly[currenttranspoly].verts = 0;
  49 //      transpoly[currenttranspoly].ndist = 0; // clear the normal
  50 }
  51
  52 // turned into a #define
  53 /*
  54 void transpolyvert(float x, float y, float z, float s, float t, int r, int g, int b, int a)
  55 {
  56         int i;
  57         if (currenttranspoly >= MAX_TRANSPOLYS || currenttransvert >= MAX_TRANSVERTS)
  58                 return;
  59         transvert[currenttransvert].s = s;
  60         transvert[currenttransvert].t = t;
  61         transvert[currenttransvert].r = bound(0, r, 255);
  62         transvert[currenttransvert].g = bound(0, g, 255);
  63         transvert[currenttransvert].b = bound(0, b, 255);
  64         transvert[currenttransvert].a = bound(0, a, 255);
  65         transvert[currenttransvert].v[0] = x;
  66         transvert[currenttransvert].v[1] = y;
  67         transvert[currenttransvert].v[2] = z;
  68         currenttransvert++;
  69         transpoly[currenttranspoly].verts++;
  70 }
  71 */
  72
  73 void transpolyend()
  74 {
  75         if (currenttranspoly >= MAX_TRANSPOLYS)
  76                 return;
  77         if (transpoly[currenttranspoly].verts < 3) // skip invalid polygons
  78         {
  79                 currenttransvert = transpoly[currenttranspoly].firstvert; // reset vert pointer
  80                 return;
  81         }
  82         if (currenttransvert >= MAX_TRANSVERTS)
  83                 return;
  84         currenttranspoly++;
  85 }
  86
  87 int transpolyindices;
  88 void transpolyrenderminmax()
  89 {
  90         int i, j, k, lastvert;
  91         vec_t d, min, max, viewdist, s, average;
  92         //vec_t ndist;
  93         //vec3_t v1, v2, n;
  94         transpolyindices = 0;
  95         viewdist = DotProduct(r_refdef.vieworg, vpn);
  96         for (i = 0;i < currenttranspoly;i++)
  97         {
  98                 if (transpoly[i].verts < 3) // only process valid polygons
  99                         continue;
 100                 min = 1000000;max = -1000000;
 101                 s = 1.0f / transpoly[i].verts;
 102                 lastvert = transpoly[i].firstvert + transpoly[i].verts;
 103                 average = 0;
 104                 for (j = transpoly[i].firstvert;j < lastvert;j++)
 105                 {
 106                         d = DotProduct(transvert[j].v, vpn)-viewdist;
 107                         if (d < min) min = d;
 108                         if (d > max) max = d;
 109                         average += d * s;
 110                 }
 111                 if (max < 4) // free to check here, so skip polys behind the view
 112                         continue;
 113                 transpoly[i].distance = average;
 114                 /*
 115                 transpoly[i].mindistance = min;
 116                 transpoly[i].maxdistance = max;
 117                 // calculate normal (eek)
 118                 VectorSubtract(transvert[transpoly[i].firstvert  ].v, transvert[transpoly[i].firstvert+1].v, v1);
 119                 VectorSubtract(transvert[transpoly[i].firstvert+2].v, transvert[transpoly[i].firstvert+1].v, v2);
 120                 VectorNormalize(v1);
 121                 VectorNormalize(v2);
 122                 if (transpoly[i].verts > 3 && fabs(DotProduct(v1, v2)) >= (1.0f - (1.0f / 256.0f))) // colinear edges, find a better triple
 123                 {
 124                         VectorSubtract(transvert[transpoly[i].firstvert + transpoly[i].verts - 1].v, transvert[transpoly[i].firstvert].v, v1);
 125                         VectorSubtract(transvert[transpoly[i].firstvert + 1].v, transvert[transpoly[i].firstvert].v, v2);
 126                         VectorNormalize(v1);
 127                         VectorNormalize(v2);
 128                         if (fabs(DotProduct(v1, v2)) < (1.0f - (1.0f / 256.0f))) // found a good triple
 129                                 goto foundtriple;
 130                         for (k = transpoly[i].firstvert + 2;k < (transpoly[i].firstvert + transpoly[i].verts - 1);k++)
 131                         {
 132                                 VectorSubtract(transvert[k-1].v, transvert[k].v, v1);
 133                                 VectorSubtract(transvert[k+1].v, transvert[k].v, v2);
 134                                 VectorNormalize(v1);
 135                                 VectorNormalize(v2);
 136                                 if (fabs(DotProduct(v1, v2)) < (1.0f - (1.0f / 256.0f))) // found a good triple
 137                                         goto foundtriple;
 138                         }
 139                         VectorSubtract(transvert[k-1].v, transvert[k].v, v1);
 140                         VectorSubtract(transvert[transpoly[i].firstvert].v, transvert[k].v, v2);
 141                         VectorNormalize(v1);
 142                         VectorNormalize(v2);
 143                         if (fabs(DotProduct(v1, v2)) >= (1.0f - (1.0f / 256.0f))) // no good triples; the polygon is a line, skip it
 144                                 continue;
 145                 }
 146 foundtriple:
 147                 CrossProduct(v1, v2, n);
 148                 VectorNormalize(n);
 149                 ndist = DotProduct(transvert[transpoly[i].firstvert+1].v, n);
 150                 // sorted insert
 151                 for (j = 0;j < transpolyindices;j++)
 152                 {
 153                         // easy cases
 154                         if (transpoly[transpolyindex[j]].mindistance > max)
 155                                 continue;
 156                         if (transpoly[transpolyindex[j]].maxdistance < min)
 157                                 break;
 158                         // hard case, check side
 159                         for (k = transpoly[transpolyindex[j]].firstvert;k < (transpoly[transpolyindex[j]].firstvert + transpoly[transpolyindex[j]].verts);k++)
 160                                 if (DotProduct(transvert[k].v, n) < ndist)
 161                                         goto skip;
 162                         break;
 163 skip:
 164                         ;
 165                 }
 166                 */
 167                 // sorted insert
 168                 for (j = 0;j < transpolyindices;j++)
 169                         if (transpoly[transpolyindex[j]].distance < average)
 170                                 break;
 171                 for (k = transpolyindices;k > j;k--)
 172                         transpolyindex[k] = transpolyindex[k-1];
 173                 transpolyindices++;
 174                 transpolyindex[j] = i;
 175         }
 176 }
 177
 178 // LordHavoc: qsort compare function
 179 /*
 180 int transpolyqsort(const void *ia, const void *ib)
 181 {
 182         transpoly_t *a, *b;
 183         int i, j;
 184         a = &transpoly[*((unsigned short *)ia)];
 185         b = &transpoly[*((unsigned short *)ib)];
 186         // easy cases
 187         if (a->mindistance > b->mindistance && a->maxdistance > b->maxdistance)
 188                 return -1; // behind
 189         if (a->mindistance < b->mindistance && a->maxdistance < b->maxdistance)
 190                 return 1; // infront
 191         // hard case
 192         if (!a->ndist)
 193         {
 194                 // calculate normal (eek)
 195                 vec3_t v1, v2;
 196                 VectorSubtract(transvert[a->firstvert  ].v, transvert[a->firstvert+1].v, v1);
 197                 VectorSubtract(transvert[a->firstvert+2].v, transvert[a->firstvert+1].v, v2);
 198                 CrossProduct(v1, v2, a->n);
 199                 VectorNormalize(a->n);
 200                 a->ndist = DotProduct(transvert[a->firstvert  ].v, a->n);
 201         }
 202         // check side
 203         for (i = b->firstvert, j = 0;i < (b->firstvert + b->verts);i++)
 204                 j += DotProduct(transvert[i].v, a->n) < a->ndist; // (1) b is infront of a
 205         if (j == 0)
 206                 return -1; // (-1) a is behind b
 207         return j == b->verts; // (1) a is infront of b    (0) a and b intersect
 208 //      return (transpoly[*((unsigned short *)ib)].mindistance + transpoly[*((unsigned short *)ib)].maxdistance) - (transpoly[*((unsigned short *)ia)].mindistance + transpoly[*((unsigned short *)ia)].maxdistance);
 209 }
 210 */
 211
 212 extern qboolean isG200;
 213
 214 /*
 215 void transpolysort()
 216 {
 217         int i, j, a;
 218 //      qsort(&transpolyindex[0], transpolyindices, sizeof(unsigned short), transpolyqsort);
 219         a = true;
 220         while(a)
 221         {
 222                 a = false;
 223                 for (i = 1;i < transpolyindices;i++)
 224                 {
 225                         // easy cases
 226                         if (transpoly[transpolyindex[i - 1]].mindistance > transpoly[transpolyindex[i]].mindistance && transpoly[transpolyindex[i - 1]].maxdistance > transpoly[transpolyindex[i]].maxdistance)
 227                                 continue; // previous is behind (no swap)
 228                         if (transpoly[transpolyindex[i - 1]].mindistance < transpoly[transpolyindex[i]].mindistance && transpoly[transpolyindex[i - 1]].maxdistance < transpoly[transpolyindex[i]].maxdistance)
 229                                 goto swap; // previous is infront (swap)
 230                         // hard case
 231 */
 232                         /*
 233                         if (!transpoly[transpolyindex[i - 1]].ndist)
 234                         {
 235                                 // calculate normal (eek)
 236                                 vec3_t v1, v2;
 237                                 VectorSubtract(transvert[transpoly[transpolyindex[i - 1]].firstvert  ].v, transvert[transpoly[transpolyindex[i - 1]].firstvert+1].v, v1);
 238                                 VectorSubtract(transvert[transpoly[transpolyindex[i - 1]].firstvert+2].v, transvert[transpoly[transpolyindex[i - 1]].firstvert+1].v, v2);
 239                                 CrossProduct(v1, v2, transpoly[transpolyindex[i - 1]].n);
 240                                 VectorNormalize(transpoly[transpolyindex[i - 1]].n);
 241                                 transpoly[transpolyindex[i - 1]].ndist = DotProduct(transvert[transpoly[transpolyindex[i - 1]].firstvert  ].v, transpoly[transpolyindex[i - 1]].n);
 242                         }
 243                         if (DotProduct(transpoly[transpolyindex[i - 1]].n, vpn) >= 0.0f) // backface
 244                                 continue;
 245                         */
 246 /*
 247                         // check side
 248                         for (i = transpoly[transpolyindex[i]].firstvert;i < (transpoly[transpolyindex[i]].firstvert + transpoly[transpolyindex[i]].verts);i++)
 249                                 if (DotProduct(transvert[i].v, transpoly[transpolyindex[i - 1]].n) >= transpoly[transpolyindex[i - 1]].ndist)
 250                                         goto noswap; // previous is behind or they intersect
 251 swap:
 252                         // previous is infront (swap)
 253                         j = transpolyindex[i];
 254                         transpolyindex[i] = transpolyindex[i - 1];
 255                         transpolyindex[i - 1] = j;
 256                         a = true;
 257 noswap:
 258                         ;
 259                 }
 260         }
 261 }
 262 */
 263
 264 void transpolyrender()
 265 {
 266         int i, j, tpolytype, texnum;
 267         transpoly_t *p;
 268         if (currenttranspoly < 1)
 269                 return;
 270         transpolyrenderminmax();
 271         if (transpolyindices < 1)
 272                 return;
 273         // testing
 274 //      Con_DPrintf("transpolyrender: %i polys %i infront %i vertices\n", currenttranspoly, transpolyindices, currenttransvert);
 275 //      if (transpolyindices >= 2)
 276 //              transpolysort();
 277         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 278         glEnable(GL_BLEND);
 279         glShadeModel(GL_SMOOTH);
 280         glDepthMask(0); // disable zbuffer updates
 281         if (isG200) // Matrox G200 cards can't handle per pixel alpha
 282                 glEnable(GL_ALPHA_TEST);
 283         else
 284                 glDisable(GL_ALPHA_TEST);
 285         // later note: wasn't working on my TNT drivers...  strangely...  used a cheaper hack in transpolyvert
 286         //// offset by 16 depth units so decal sprites appear infront of walls
 287         //glPolygonOffset(1, -16);
 288         //glEnable(GL_POLYGON_OFFSET_FILL);
 289         tpolytype = -1;
 290         texnum = -1;
 291         /*
 292         if (gl_vertexarrays.value)
 293         {
 294                 // set up the vertex array
 295                 qglInterleavedArrays(GL_T2F_C4UB_V3F, 0, transvert);
 296                 for (i = 0;i < transpolyindices;i++)
 297                 {
 298                         p = &transpoly[transpolyindex[i]];
 299                         if (p->texnum != texnum || p->transpolytype != tpolytype)
 300                         {
 301                                 if (p->texnum != texnum)
 302                                 {
 303                                         texnum = p->texnum;
 304                                         glBindTexture(GL_TEXTURE_2D, texnum);
 305                                 }
 306                                 if (p->transpolytype != tpolytype)
 307                                 {
 308                                         tpolytype = p->transpolytype;
 309                                         if (tpolytype == TPOLYTYPE_ADD) // additive
 310                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 311                                         else // alpha
 312                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 313                                 }
 314                         }
 315                         qglDrawArrays(GL_TRIANGLE_FAN, p->firstvert, p->verts);
 316                         if (p->glowtexnum)
 317                         {
 318                                 texnum = p->glowtexnum; // highly unlikely to match next poly, but...
 319                                 glBindTexture(GL_TEXTURE_2D, texnum);
 320                                 tpolytype = TPOLYTYPE_ADD; // might match next poly
 321                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 322                                 qglDrawArrays(GL_TRIANGLE_FAN, p->firstvert, p->verts);
 323                         }
 324                 }
 325                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 326                 glDisableClientState(GL_COLOR_ARRAY);
 327                 glDisableClientState(GL_VERTEX_ARRAY);
 328         }
 329         else
 330         */
 331         {
 332                 int points = -1;
 333                 transvert_t *vert;
 334                 for (i = 0;i < transpolyindices;i++)
 335                 {
 336                         p = &transpoly[transpolyindex[i]];
 337                         if (p->texnum != texnum || p->verts != points || p->transpolytype != tpolytype)
 338                         {
 339                                 glEnd();
 340                                 if (isG200)
 341                                 {
 342                                         if (p->fogtexnum) // alpha
 343                                                 glEnable(GL_ALPHA_TEST);
 344                                         else
 345                                                 glDisable(GL_ALPHA_TEST);
 346                                 }
 347                                 if (p->texnum != texnum)
 348                                 {
 349                                         texnum = p->texnum;
 350                                         glBindTexture(GL_TEXTURE_2D, texnum);
 351                                 }
 352                                 if (p->transpolytype != tpolytype)
 353                                 {
 354                                         tpolytype = p->transpolytype;
 355                                         if (tpolytype == TPOLYTYPE_ADD) // additive
 356                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 357                                         else // alpha
 358                                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 359                                 }
 360                                 points = p->verts;
 361                                 switch (points)
 362                                 {
 363                                 case 3:
 364                                         glBegin(GL_TRIANGLES);
 365                                         break;
 366                                 case 4:
 367                                         glBegin(GL_QUADS);
 368                                         break;
 369                                 default:
 370                                         glBegin(GL_TRIANGLE_FAN);
 371                                         points = -1; // to force a reinit on the next poly
 372                                         break;
 373                                 }
 374                         }
 375                         for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 376                         {
 377                                 // would be 2fv, but windoze Matrox G200 and probably G400 drivers don't support that (dumb...)
 378                                 glTexCoord2f(vert->s, vert->t);
 379                                 // again, vector version isn't supported I think
 380                                 glColor4ub(vert->r, vert->g, vert->b, vert->a);
 381                                 glVertex3fv(vert->v);
 382                         }
 383                         if (p->glowtexnum)
 384                         {
 385                                 glEnd();
 386                                 texnum = p->glowtexnum; // highly unlikely to match next poly, but...
 387                                 glBindTexture(GL_TEXTURE_2D, texnum);
 388                                 if (tpolytype != TPOLYTYPE_ADD)
 389                                 {
 390                                         tpolytype = TPOLYTYPE_ADD; // might match next poly
 391                                         glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 392                                 }
 393                                 points = -1;
 394                                 glBegin(GL_TRIANGLE_FAN);
 395                                 for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 396                                 {
 397                                         glColor4ub(255,255,255,vert->a);
 398                                         // would be 2fv, but windoze Matrox G200 and probably G400 drivers don't support that (dumb...)
 399                                         glTexCoord2f(vert->s, vert->t);
 400                                         glVertex3fv(vert->v);
 401                                 }
 402                                 glEnd();
 403                         }
 404                         if (fogenabled && p->transpolytype == TPOLYTYPE_ALPHA)
 405                         {
 406                                 vec3_t diff;
 407                                 glEnd();
 408                                 points = -1; // to force a reinit on the next poly
 409                                 if (tpolytype != TPOLYTYPE_ALPHA)
 410                                 {
 411                                         tpolytype = TPOLYTYPE_ALPHA; // probably matchs next poly
 412                                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 413                                 }
 414                                 if (p->fogtexnum)
 415                                 {
 416                                         if (texnum != p->fogtexnum) // highly unlikely to match next poly, but...
 417                                         {
 418                                                 texnum = p->fogtexnum;
 419                                                 glBindTexture(GL_TEXTURE_2D, texnum);
 420                                         }
 421                                         glBegin(GL_TRIANGLE_FAN);
 422                                         for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 423                                         {
 424                                                 VectorSubtract(vert->v, r_refdef.vieworg,diff);
 425                                                 glTexCoord2f(vert->s, vert->t);
 426                                                 glColor4f(fogcolor[0], fogcolor[1], fogcolor[2], vert->a*(1.0f/255.0f)*exp(fogdensity/DotProduct(diff,diff)));
 427                                                 glVertex3fv(vert->v);
 428                                         }
 429                                         glEnd ();
 430                                 }
 431                                 else
 432                                 {
 433                                         glDisable(GL_TEXTURE_2D);
 434                                         glBegin(GL_TRIANGLE_FAN);
 435                                         for (j = 0,vert = &transvert[p->firstvert];j < p->verts;j++, vert++)
 436                                         {
 437                                                 VectorSubtract(vert->v, r_refdef.vieworg,diff);
 438                                                 glColor4f(fogcolor[0], fogcolor[1], fogcolor[2], vert->a*(1.0f/255.0f)*exp(fogdensity/DotProduct(diff,diff)));
 439                                                 glVertex3fv(vert->v);
 440                                         }
 441                                         glEnd ();
 442                                         glEnable(GL_TEXTURE_2D);
 443                                 }
 444                         }
 445                 }
 446                 glEnd();
 447         }
 448
 449         //glDisable(GL_POLYGON_OFFSET_FILL);
 450         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 451         glDepthMask(1); // enable zbuffer updates
 452         glDisable(GL_ALPHA_TEST);
 453 }
 454
 455 void wallpolyclear()
 456 {
 457         currentwallpoly = currentwallvert = 0;
 458 }
 459
 460 extern qboolean lighthalf;
 461 void wallpolyrender()
 462 {
 463         int i, j, texnum, lighttexnum;
 464         wallpoly_t *p;
 465         wallvert_t *vert;
 466         if (currentwallpoly < 1)
 467                 return;
 468         // testing
 469         //Con_DPrintf("wallpolyrender: %i polys %i vertices\n", currentwallpoly, currentwallvert);
 470         if (!gl_mtexable)
 471                 gl_multitexture.value = 0;
 472         glDisable(GL_BLEND);
 473         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 474         glShadeModel(GL_FLAT);
 475         // make sure zbuffer is enabled
 476         glEnable(GL_DEPTH_TEST);
 477         glDisable(GL_ALPHA_TEST);
 478         glDepthMask(1);
 479         glColor3f(1,1,1);
 480         if (r_fullbright.value) // LordHavoc: easy to do fullbright...
 481         {
 482                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 483                 texnum = -1;
 484                 for (i = 0,p = &wallpoly[0];i < currentwallpoly;i++, p++)
 485                 {
 486                         if (p->texnum != texnum)
 487                         {
 488                                 texnum = p->texnum;
 489                                 glBindTexture(GL_TEXTURE_2D, texnum);
 490                         }
 491                         vert = &wallvert[p->firstvert];
 492                         glBegin(GL_POLYGON);
 493                         for (j=0 ; j<p->verts ; j++, vert++)
 494                         {
 495                                 glTexCoord2f (vert->s, vert->t);
 496                                 glVertex3fv (vert->vert);
 497                         }
 498                         glEnd ();
 499                 }
 500         }
 501         else if (gl_multitexture.value)
 502         {
 503                 qglSelectTexture(gl_mtex_enum+0);
 504                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 505                 glEnable(GL_TEXTURE_2D);
 506                 qglSelectTexture(gl_mtex_enum+1);
 507                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 508                 glEnable(GL_TEXTURE_2D);
 509                 texnum = -1;
 510                 lighttexnum = -1;
 511                 for (i = 0,p = &wallpoly[0];i < currentwallpoly;i++, p++)
 512                 {
 513 //                      if (p->texnum != texnum || p->lighttexnum != lighttexnum)
 514 //                      {
 515                                 texnum = p->texnum;
 516                                 lighttexnum = p->lighttexnum;
 517                                 qglSelectTexture(gl_mtex_enum+0);
 518                                 glBindTexture(GL_TEXTURE_2D, texnum);
 519                                 qglSelectTexture(gl_mtex_enum+1);
 520                                 glBindTexture(GL_TEXTURE_2D, lighttexnum);
 521 //                      }
 522                         vert = &wallvert[p->firstvert];
 523                         glBegin(GL_POLYGON);
 524                         for (j=0 ; j<p->verts ; j++, vert++)
 525                         {
 526                                 qglMTexCoord2f(gl_mtex_enum, vert->s, vert->t); // texture
 527                                 qglMTexCoord2f((gl_mtex_enum+1), vert->u, vert->v); // lightmap
 528                                 glVertex3fv (vert->vert);
 529                         }
 530                         glEnd ();
 531                 }
 532
 533                 qglSelectTexture(gl_mtex_enum+1);
 534                 glDisable(GL_TEXTURE_2D);
 535                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 536                 qglSelectTexture(gl_mtex_enum+0);
 537                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 538         }
 539         else
 540         {
 541                 // first do the textures
 542                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 543                 texnum = -1;
 544                 for (i = 0,p = &wallpoly[0];i < currentwallpoly;i++, p++)
 545                 {
 546                         if (p->texnum != texnum)
 547                         {
 548                                 texnum = p->texnum;
 549                                 glBindTexture(GL_TEXTURE_2D, texnum);
 550                         }
 551                         vert = &wallvert[p->firstvert];
 552                         glBegin(GL_POLYGON);
 553                         for (j=0 ; j<p->verts ; j++, vert++)
 554                         {
 555                                 glTexCoord2f (vert->s, vert->t);
 556                                 glVertex3fv (vert->vert);
 557                         }
 558                         glEnd ();
 559                 }
 560                 // then modulate using the lightmaps
 561                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 562                 glBlendFunc(GL_ZERO, GL_SRC_COLOR);
 563                 glEnable(GL_BLEND);
 564                 texnum = -1;
 565                 for (i = 0,p = &wallpoly[0];i < currentwallpoly;i++, p++)
 566                 {
 567                         if (p->lighttexnum != texnum)
 568                         {
 569                                 texnum = p->lighttexnum;
 570                                 glBindTexture(GL_TEXTURE_2D, texnum);
 571                         }
 572                         vert = &wallvert[p->firstvert];
 573                         glBegin(GL_POLYGON);
 574                         for (j=0 ; j<p->verts ; j++, vert++)
 575                         {
 576                                 glTexCoord2f (vert->u, vert->v);
 577                                 glVertex3fv (vert->vert);
 578                         }
 579                         glEnd ();
 580                 }
 581         }
 582         // render glow textures
 583         glDepthMask(0);
 584         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 585         glBlendFunc(GL_ONE, GL_ONE);
 586         glEnable(GL_BLEND);
 587         if (lighthalf)
 588                 glColor3f(0.5,0.5,0.5);
 589         else
 590                 glColor3f(1,1,1);
 591         texnum = -1;
 592         for (i = 0,p = &wallpoly[0];i < currentwallpoly;i++, p++)
 593         {
 594                 if (!p->glowtexnum)
 595                         continue;
 596                 if (p->glowtexnum != texnum)
 597                 {
 598                         texnum = p->glowtexnum;
 599                         glBindTexture(GL_TEXTURE_2D, texnum);
 600                 }
 601                 vert = &wallvert[p->firstvert];
 602                 glBegin(GL_POLYGON);
 603                 for (j=0 ; j<p->verts ; j++, vert++)
 604                 {
 605                         glTexCoord2f (vert->s, vert->t);
 606                         glVertex3fv (vert->vert);
 607                 }
 608                 glEnd ();
 609         }
 610         glColor3f(1,1,1);
 611         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 612         glShadeModel(GL_SMOOTH);
 613         if (fogenabled)
 614         {
 615                 vec3_t diff;
 616                 glDisable(GL_TEXTURE_2D);
 617                 for (i = 0,p = &wallpoly[0];i < currentwallpoly;i++, p++)
 618                 {
 619                         vert = &wallvert[p->firstvert];
 620                         glBegin(GL_POLYGON);
 621                         for (j=0 ; j<p->verts ; j++, vert++)
 622                         {
 623                                 VectorSubtract(vert->vert, r_refdef.vieworg,diff);
 624                                 glColor4f(fogcolor[0], fogcolor[1], fogcolor[2], exp(fogdensity/DotProduct(diff,diff)));
 625                                 glVertex3fv (vert->vert);
 626                         }
 627                         glEnd ();
 628                 }
 629                 glEnable(GL_TEXTURE_2D);
 630         }
 631         glDisable(GL_BLEND);
 632         glDepthMask(1);
 633 }
 634
 635 void skypolyclear()
 636 {
 637         currentskypoly = currentskyvert = 0;
 638 }
 639
 640 extern qboolean isATI;
 641 void skypolyrender()
 642 {
 643         int i, j;
 644         skypoly_t *p;
 645         skyvert_t *vert;
 646         if (currentskypoly < 1)
 647                 return;
 648         // testing
 649 //      Con_DPrintf("skypolyrender: %i polys %i vertices\n", currentskypoly, currentskyvert);
 650         glDisable(GL_TEXTURE_2D);
 651         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 652         glDisable(GL_ALPHA_TEST);
 653         glDisable(GL_BLEND);
 654         // make sure zbuffer is enabled
 655         glEnable(GL_DEPTH_TEST);
 656         glDepthMask(1);
 657         glColor3fv(fogcolor); // note: gets rendered over by sky if fog is not enabled
 658         for (i = 0,p = &skypoly[0];i < currentskypoly;i++, p++)
 659         {
 660                 vert = &skyvert[p->firstvert];
 661                 glBegin(GL_POLYGON);
 662                 for (j=0 ; j<p->verts ; j++, vert++)
 663                         glVertex3fv (vert->v);
 664                 glEnd ();
 665         }
 666         glColor3f(1,1,1);
 667         glEnable(GL_TEXTURE_2D);
 668 }