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