r_light.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // r_light.c
  21
  22 #include "quakedef.h"
  23
  24 cvar_t r_lightmodels = {"r_lightmodels", "1"};
  25
  26 extern cvar_t gl_transform;
  27
  28 void r_light_start()
  29 {
  30 }
  31
  32 void r_light_shutdown()
  33 {
  34 }
  35
  36 void R_Light_Init()
  37 {
  38         Cvar_RegisterVariable(&r_lightmodels);
  39         R_RegisterModule("R_Light", r_light_start, r_light_shutdown);
  40 }
  41
  42 int     r_dlightframecount;
  43
  44 /*
  45 ==================
  46 R_AnimateLight
  47 ==================
  48 */
  49 void R_AnimateLight (void)
  50 {
  51         int                     i,j,k;
  52
  53 //
  54 // light animations
  55 // 'm' is normal light, 'a' is no light, 'z' is double bright
  56         i = (int)(cl.time*10);
  57         for (j=0 ; j<MAX_LIGHTSTYLES ; j++)
  58         {
  59                 if (!cl_lightstyle[j].length)
  60                 {
  61                         d_lightstylevalue[j] = 256;
  62                         continue;
  63                 }
  64                 k = i % cl_lightstyle[j].length;
  65                 k = cl_lightstyle[j].map[k] - 'a';
  66                 k = k*22;
  67                 d_lightstylevalue[j] = k;
  68         }
  69 }
  70
  71 /*
  72 =============================================================================
  73
  74 DYNAMIC LIGHTS
  75
  76 =============================================================================
  77 */
  78
  79 /*
  80 =============
  81 R_MarkLights
  82 =============
  83 */
  84 void R_OldMarkLights (vec3_t lightorigin, dlight_t *light, int bit, int bitindex, mnode_t *node)
  85 {
  86         float           ndist, maxdist;
  87         msurface_t      *surf;
  88         int                     i;
  89
  90         if (!r_dynamic.value)
  91                 return;
  92
  93         // for comparisons to minimum acceptable light
  94         maxdist = light->radius * light->radius;
  95
  96         // clamp radius to avoid exceeding 32768 entry division table
  97         if (maxdist > 4194304)
  98                 maxdist = 4194304;
  99
 100 loc0:
 101         if (node->contents < 0)
 102                 return;
 103
 104         ndist = PlaneDiff(lightorigin, node->plane);
 105
 106         if (ndist > light->radius)
 107         {
 108                 if (node->children[0]->contents >= 0) // LordHavoc: save some time by not pushing another stack frame
 109                 {
 110                         node = node->children[0];
 111                         goto loc0;
 112                 }
 113                 return;
 114         }
 115         if (ndist < -light->radius)
 116         {
 117                 if (node->children[1]->contents >= 0) // LordHavoc: save some time by not pushing another stack frame
 118                 {
 119                         node = node->children[1];
 120                         goto loc0;
 121                 }
 122                 return;
 123         }
 124
 125         if (node->dlightframe != r_dlightframecount) // not dynamic until now
 126         {
 127                 node->dlightbits[0] = node->dlightbits[1] = node->dlightbits[2] = node->dlightbits[3] = node->dlightbits[4] = node->dlightbits[5] = node->dlightbits[6] = node->dlightbits[7] = 0;
 128                 node->dlightframe = r_dlightframecount;
 129         }
 130         node->dlightbits[bitindex] |= bit;
 131
 132 // mark the polygons
 133         surf = cl.worldmodel->surfaces + node->firstsurface;
 134         for (i=0 ; i<node->numsurfaces ; i++, surf++)
 135         {
 136                 int d;
 137                 float dist, dist2, impact[3];
 138                 dist = ndist;
 139                 if (surf->flags & SURF_PLANEBACK)
 140                         dist = -dist;
 141
 142                 if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 143                         continue;
 144
 145                 dist2 = dist * dist;
 146                 if (dist2 >= maxdist)
 147                         continue;
 148
 149                 impact[0] = light->origin[0] - surf->plane->normal[0] * dist;
 150                 impact[1] = light->origin[1] - surf->plane->normal[1] * dist;
 151                 impact[2] = light->origin[2] - surf->plane->normal[2] * dist;
 152
 153                 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 154
 155                 if (d < 0)
 156                 {
 157                         dist2 += d * d;
 158                         if (dist2 >= maxdist)
 159                                 continue;
 160                 }
 161                 else
 162                 {
 163                         d -= surf->extents[0] + 16;
 164                         if (d > 0)
 165                         {
 166                                 dist2 += d * d;
 167                                 if (dist2 >= maxdist)
 168                                         continue;
 169                         }
 170                 }
 171
 172                 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 173
 174                 if (d < 0)
 175                 {
 176                         dist2 += d * d;
 177                         if (dist2 >= maxdist)
 178                                 continue;
 179                 }
 180                 else
 181                 {
 182                         d -= surf->extents[1] + 16;
 183                         if (d > 0)
 184                         {
 185                                 dist2 += d * d;
 186                                 if (dist2 >= maxdist)
 187                                         continue;
 188                         }
 189                 }
 190
 191                 if (surf->dlightframe != r_dlightframecount) // not dynamic until now
 192                 {
 193                         surf->dlightbits[0] = surf->dlightbits[1] = surf->dlightbits[2] = surf->dlightbits[3] = surf->dlightbits[4] = surf->dlightbits[5] = surf->dlightbits[6] = surf->dlightbits[7] = 0;
 194                         surf->dlightframe = r_dlightframecount;
 195                 }
 196                 surf->dlightbits[bitindex] |= bit;
 197
 198                 /*
 199                 if (((surf->flags & SURF_PLANEBACK) == 0) == ((PlaneDist(lightorigin, surf->plane)) >= surf->plane->dist))
 200                 {
 201                         if (surf->dlightframe != r_dlightframecount) // not dynamic until now
 202                         {
 203                                 surf->dlightbits[0] = surf->dlightbits[1] = surf->dlightbits[2] = surf->dlightbits[3] = surf->dlightbits[4] = surf->dlightbits[5] = surf->dlightbits[6] = surf->dlightbits[7] = 0;
 204                                 surf->dlightframe = r_dlightframecount;
 205                         }
 206                         surf->dlightbits[bitindex] |= bit;
 207                 }
 208                 */
 209         }
 210
 211         if (node->children[0]->contents >= 0)
 212         {
 213                 if (node->children[1]->contents >= 0)
 214                 {
 215                         R_OldMarkLights (lightorigin, light, bit, bitindex, node->children[0]);
 216                         node = node->children[1];
 217                         goto loc0;
 218                 }
 219                 else
 220                 {
 221                         node = node->children[0];
 222                         goto loc0;
 223                 }
 224         }
 225         else if (node->children[1]->contents >= 0)
 226         {
 227                 node = node->children[1];
 228                 goto loc0;
 229         }
 230 }
 231
 232 void R_NoVisMarkLights (vec3_t lightorigin, dlight_t *light, int bit, int bitindex, model_t *model)
 233 {
 234         R_OldMarkLights(lightorigin, light, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 235 }
 236
 237 int lightframe = 0;
 238 void R_VisMarkLights (vec3_t lightorigin, dlight_t *light, int bit, int bitindex, model_t *model)
 239 {
 240         mleaf_t *pvsleaf = Mod_PointInLeaf (lightorigin, model);
 241
 242         if (!r_dynamic.value)
 243                 return;
 244
 245         if (!pvsleaf->compressed_vis)
 246         {       // no vis info, so make all visible
 247                 R_OldMarkLights(lightorigin, light, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 248                 return;
 249         }
 250         else
 251         {
 252                 int             i, k, l, m, c;
 253                 msurface_t *surf, **mark;
 254                 mleaf_t *leaf;
 255                 byte    *in = pvsleaf->compressed_vis;
 256                 int             row = (model->numleafs+7)>>3;
 257                 float   low[3], high[3], radius, dist, maxdist;
 258
 259                 lightframe++;
 260
 261                 radius = light->radius * 2;
 262
 263                 // clamp radius to avoid exceeding 32768 entry division table
 264                 if (radius > 2048)
 265                         radius = 2048;
 266
 267                 low[0] = lightorigin[0] - radius;low[1] = lightorigin[1] - radius;low[2] = lightorigin[2] - radius;
 268                 high[0] = lightorigin[0] + radius;high[1] = lightorigin[1] + radius;high[2] = lightorigin[2] + radius;
 269
 270                 // for comparisons to minimum acceptable light
 271                 maxdist = radius*radius;
 272
 273                 k = 0;
 274                 while (k < row)
 275                 {
 276                         c = *in++;
 277                         if (c)
 278                         {
 279                                 l = model->numleafs - (k << 3);
 280                                 if (l > 8)
 281                                         l = 8;
 282                                 for (i=0 ; i<l ; i++)
 283                                 {
 284                                         if (c & (1<<i))
 285                                         {
 286                                                 leaf = &model->leafs[(k << 3)+i+1];
 287                                                 leaf->lightframe = lightframe;
 288                                                 if (leaf->visframe != r_visframecount)
 289                                                         continue;
 290                                                 if (leaf->contents == CONTENTS_SOLID)
 291                                                         continue;
 292                                                 // if out of the light radius, skip
 293                                                 if (leaf->minmaxs[0] > high[0] || leaf->minmaxs[3] < low[0]
 294                                                  || leaf->minmaxs[1] > high[1] || leaf->minmaxs[4] < low[1]
 295                                                  || leaf->minmaxs[2] > high[2] || leaf->minmaxs[5] < low[2])
 296                                                         continue;
 297                                                 if (leaf->dlightframe != r_dlightframecount) // not dynamic until now
 298                                                 {
 299                                                         leaf->dlightbits[0] = leaf->dlightbits[1] = leaf->dlightbits[2] = leaf->dlightbits[3] = leaf->dlightbits[4] = leaf->dlightbits[5] = leaf->dlightbits[6] = leaf->dlightbits[7] = 0;
 300                                                         leaf->dlightframe = r_dlightframecount;
 301                                                 }
 302                                                 leaf->dlightbits[bitindex] |= bit;
 303                                                 if ((m = leaf->nummarksurfaces))
 304                                                 {
 305                                                         mark = leaf->firstmarksurface;
 306                                                         do
 307                                                         {
 308                                                                 surf = *mark++;
 309                                                                 if (surf->visframe != r_framecount || surf->lightframe == lightframe)
 310                                                                         continue;
 311                                                                 surf->lightframe = lightframe;
 312                                                                 dist = PlaneDiff(lightorigin, surf->plane);
 313                                                                 if (surf->flags & SURF_PLANEBACK)
 314                                                                         dist = -dist;
 315                                                                 // LordHavoc: make sure it is infront of the surface and not too far away
 316                                                                 if ((dist >= -0.25f || (surf->flags & SURF_LIGHTBOTHSIDES)) && dist < radius)
 317                                                                 {
 318                                                                         int d;
 319                                                                         float dist2, impact[3];
 320
 321                                                                         dist2 = dist * dist;
 322
 323                                                                         impact[0] = light->origin[0] - surf->plane->normal[0] * dist;
 324                                                                         impact[1] = light->origin[1] - surf->plane->normal[1] * dist;
 325                                                                         impact[2] = light->origin[2] - surf->plane->normal[2] * dist;
 326
 327                                                                         d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 328
 329                                                                         if (d < 0)
 330                                                                         {
 331                                                                                 dist2 += d * d;
 332                                                                                 if (dist2 >= maxdist)
 333                                                                                         continue;
 334                                                                         }
 335                                                                         else
 336                                                                         {
 337                                                                                 d -= surf->extents[0] + 16;
 338                                                                                 if (d > 0)
 339                                                                                 {
 340                                                                                         dist2 += d * d;
 341                                                                                         if (dist2 >= maxdist)
 342                                                                                                 continue;
 343                                                                                 }
 344                                                                         }
 345
 346                                                                         d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 347
 348                                                                         if (d < 0)
 349                                                                         {
 350                                                                                 dist2 += d * d;
 351                                                                                 if (dist2 >= maxdist)
 352                                                                                         continue;
 353                                                                         }
 354                                                                         else
 355                                                                         {
 356                                                                                 d -= surf->extents[1] + 16;
 357                                                                                 if (d > 0)
 358                                                                                 {
 359                                                                                         dist2 += d * d;
 360                                                                                         if (dist2 >= maxdist)
 361                                                                                                 continue;
 362                                                                                 }
 363                                                                         }
 364
 365                                                                         if (surf->dlightframe != r_dlightframecount) // not dynamic until now
 366                                                                         {
 367                                                                                 surf->dlightbits[0] = surf->dlightbits[1] = surf->dlightbits[2] = surf->dlightbits[3] = surf->dlightbits[4] = surf->dlightbits[5] = surf->dlightbits[6] = surf->dlightbits[7] = 0;
 368                                                                                 surf->dlightframe = r_dlightframecount;
 369                                                                         }
 370                                                                         surf->dlightbits[bitindex] |= bit;
 371                                                                 }
 372                                                         }
 373                                                         while (--m);
 374                                                 }
 375                                         }
 376                                 }
 377                                 k++;
 378                                 continue;
 379                         }
 380
 381                         k += *in++;
 382                 }
 383         }
 384 }
 385
 386
 387 /*
 388 =============
 389 R_PushDlights
 390 =============
 391 */
 392 void R_PushDlights (void)
 393 {
 394         int             i;
 395         dlight_t        *l;
 396
 397         r_dlightframecount = r_framecount + 1;  // because the count hasn't advanced yet for this frame
 398
 399         if (!r_dynamic.value)
 400                 return;
 401
 402         l = cl_dlights;
 403
 404         for (i=0 ; i<MAX_DLIGHTS ; i++, l++)
 405         {
 406                 if (l->die < cl.time || !l->radius)
 407                         continue;
 408 //              R_MarkLights (l->origin, l, 1<<(i&31), i >> 5, cl.worldmodel->nodes );
 409                 R_VisMarkLights (l->origin, l, 1<<(i&31), i >> 5, cl.worldmodel);
 410         }
 411 }
 412
 413
 414 /*
 415 =============================================================================
 416
 417 LIGHT SAMPLING
 418
 419 =============================================================================
 420 */
 421
 422 mplane_t                *lightplane;
 423 vec3_t                  lightspot;
 424
 425 extern cvar_t r_ambient;
 426
 427 /*
 428 int RecursiveLightPoint (vec3_t color, mnode_t *node, vec3_t start, vec3_t end)
 429 {
 430         float           front, back, frac;
 431         vec3_t          mid;
 432
 433 loc0:
 434         if (node->contents < 0)
 435                 return false;           // didn't hit anything
 436
 437 // calculate mid point
 438         front = PlaneDiff (start, node->plane);
 439         back = PlaneDiff (end, node->plane);
 440
 441         // LordHavoc: optimized recursion
 442         if ((back < 0) == (front < 0))
 443 //              return RecursiveLightPoint (color, node->children[front < 0], start, end);
 444         {
 445                 node = node->children[front < 0];
 446                 goto loc0;
 447         }
 448
 449         frac = front / (front-back);
 450         mid[0] = start[0] + (end[0] - start[0])*frac;
 451         mid[1] = start[1] + (end[1] - start[1])*frac;
 452         mid[2] = start[2] + (end[2] - start[2])*frac;
 453
 454 // go down front side
 455         if (RecursiveLightPoint (color, node->children[front < 0], start, mid))
 456                 return true;    // hit something
 457         else
 458         {
 459                 int i, ds, dt;
 460                 msurface_t *surf;
 461         // check for impact on this node
 462                 VectorCopy (mid, lightspot);
 463                 lightplane = node->plane;
 464
 465                 surf = cl.worldmodel->surfaces + node->firstsurface;
 466                 for (i = 0;i < node->numsurfaces;i++, surf++)
 467                 {
 468                         if (surf->flags & SURF_DRAWTILED)
 469                                 continue;       // no lightmaps
 470
 471                         ds = (int) ((float) DotProduct (mid, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3]);
 472                         dt = (int) ((float) DotProduct (mid, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3]);
 473
 474                         if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 475                                 continue;
 476
 477                         ds -= surf->texturemins[0];
 478                         dt -= surf->texturemins[1];
 479
 480                         if (ds > surf->extents[0] || dt > surf->extents[1])
 481                                 continue;
 482
 483                         if (surf->samples)
 484                         {
 485                                 byte *lightmap;
 486                                 int maps, line3, dsfrac = ds & 15, dtfrac = dt & 15, r00 = 0, g00 = 0, b00 = 0, r01 = 0, g01 = 0, b01 = 0, r10 = 0, g10 = 0, b10 = 0, r11 = 0, g11 = 0, b11 = 0;
 487                                 float scale;
 488                                 line3 = ((surf->extents[0]>>4)+1)*3;
 489
 490                                 lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 491
 492                                 for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 493                                 {
 494                                         scale = (float) d_lightstylevalue[surf->styles[maps]] * 1.0 / 256.0;
 495                                         r00 += (float) lightmap[      0] * scale;g00 += (float) lightmap[      1] * scale;b00 += (float) lightmap[2] * scale;
 496                                         r01 += (float) lightmap[      3] * scale;g01 += (float) lightmap[      4] * scale;b01 += (float) lightmap[5] * scale;
 497                                         r10 += (float) lightmap[line3+0] * scale;g10 += (float) lightmap[line3+1] * scale;b10 += (float) lightmap[line3+2] * scale;
 498                                         r11 += (float) lightmap[line3+3] * scale;g11 += (float) lightmap[line3+4] * scale;b11 += (float) lightmap[line3+5] * scale;
 499                                         lightmap += ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 500                                 }
 501
 502                                 color[0] += (float) ((int) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)));
 503                                 color[1] += (float) ((int) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)));
 504                                 color[2] += (float) ((int) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)));
 505                         }
 506                         return true; // success
 507                 }
 508
 509         // go down back side
 510                 return RecursiveLightPoint (color, node->children[front >= 0], mid, end);
 511         }
 512 }
 513
 514 void R_LightPoint (vec3_t color, vec3_t p)
 515 {
 516         vec3_t          end;
 517
 518         if (r_fullbright.value || !cl.worldmodel->lightdata)
 519         {
 520                 color[0] = color[1] = color[2] = 255;
 521                 return;
 522         }
 523
 524         end[0] = p[0];
 525         end[1] = p[1];
 526         end[2] = p[2] - 2048;
 527
 528         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 529         RecursiveLightPoint (color, cl.worldmodel->nodes, p, end);
 530 }
 531
 532 void SV_LightPoint (vec3_t color, vec3_t p)
 533 {
 534         vec3_t          end;
 535
 536         if (!sv.worldmodel->lightdata)
 537         {
 538                 color[0] = color[1] = color[2] = 255;
 539                 return;
 540         }
 541
 542         end[0] = p[0];
 543         end[1] = p[1];
 544         end[2] = p[2] - 2048;
 545
 546         color[0] = color[1] = color[2] = 0;
 547         RecursiveLightPoint (color, sv.worldmodel->nodes, p, end);
 548 }
 549 */
 550
 551 int RecursiveLightPoint (vec3_t color, mnode_t *node, float x, float y, float startz, float endz)
 552 {
 553         int             side, distz = endz - startz;
 554         float   front, back;
 555         float   mid;
 556
 557 loc0:
 558         if (node->contents < 0)
 559                 return false;           // didn't hit anything
 560
 561         switch (node->plane->type)
 562         {
 563         case PLANE_X:
 564                 node = node->children[x < node->plane->dist];
 565                 goto loc0;
 566         case PLANE_Y:
 567                 node = node->children[y < node->plane->dist];
 568                 goto loc0;
 569         case PLANE_Z:
 570                 side = startz < node->plane->dist;
 571                 if ((endz < node->plane->dist) == side)
 572                 {
 573                         node = node->children[side];
 574                         goto loc0;
 575                 }
 576                 // found an intersection
 577 //              mid = startz + (endz - startz) * (startz - node->plane->dist) / (startz - endz);
 578 //              mid = startz + distz * (startz - node->plane->dist) / (-distz);
 579 //              mid = startz + (-(startz - node->plane->dist));
 580 //              mid = startz - (startz - node->plane->dist);
 581 //              mid = startz + node->plane->dist - startz;
 582                 mid = node->plane->dist;
 583                 break;
 584         default:
 585                 back = front = x * node->plane->normal[0] + y * node->plane->normal[1];
 586                 front += startz * node->plane->normal[2];
 587                 back += endz * node->plane->normal[2];
 588                 side = front < node->plane->dist;
 589                 if ((back < node->plane->dist) == side)
 590                 {
 591                         node = node->children[side];
 592                         goto loc0;
 593                 }
 594                 // found an intersection
 595 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / ((front - node->plane->dist) - (back - node->plane->dist)));
 596 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / (front - back));
 597                 mid = startz + distz * (front - node->plane->dist) / (front - back);
 598                 break;
 599         }
 600
 601         // go down front side
 602         if (node->children[side]->contents >= 0 && RecursiveLightPoint (color, node->children[side], x, y, startz, mid))
 603                 return true;    // hit something
 604         else
 605         {
 606                 // check for impact on this node
 607                 if (node->numsurfaces)
 608                 {
 609                         int i, ds, dt;
 610                         msurface_t *surf;
 611                         lightspot[0] = x;
 612                         lightspot[1] = y;
 613                         lightspot[2] = mid;
 614                         lightplane = node->plane;
 615
 616                         surf = cl.worldmodel->surfaces + node->firstsurface;
 617                         for (i = 0;i < node->numsurfaces;i++, surf++)
 618                         {
 619                                 if (surf->flags & SURF_DRAWTILED)
 620                                         continue;       // no lightmaps
 621
 622                                 ds = (int) (x * surf->texinfo->vecs[0][0] + y * surf->texinfo->vecs[0][1] + mid * surf->texinfo->vecs[0][2] + surf->texinfo->vecs[0][3]);
 623                                 dt = (int) (x * surf->texinfo->vecs[1][0] + y * surf->texinfo->vecs[1][1] + mid * surf->texinfo->vecs[1][2] + surf->texinfo->vecs[1][3]);
 624
 625                                 if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 626                                         continue;
 627
 628                                 ds -= surf->texturemins[0];
 629                                 dt -= surf->texturemins[1];
 630
 631                                 if (ds > surf->extents[0] || dt > surf->extents[1])
 632                                         continue;
 633
 634                                 if (surf->samples)
 635                                 {
 636                                         byte *lightmap;
 637                                         int maps, line3, size3, dsfrac = ds & 15, dtfrac = dt & 15, scale = 0, r00 = 0, g00 = 0, b00 = 0, r01 = 0, g01 = 0, b01 = 0, r10 = 0, g10 = 0, b10 = 0, r11 = 0, g11 = 0, b11 = 0;
 638                                         line3 = ((surf->extents[0]>>4)+1)*3;
 639                                         size3 = ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 640
 641                                         lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 642
 643                                         for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 644                                         {
 645                                                 scale = d_lightstylevalue[surf->styles[maps]];
 646                                                 r00 += lightmap[      0] * scale;g00 += lightmap[      1] * scale;b00 += lightmap[      2] * scale;
 647                                                 r01 += lightmap[      3] * scale;g01 += lightmap[      4] * scale;b01 += lightmap[      5] * scale;
 648                                                 r10 += lightmap[line3+0] * scale;g10 += lightmap[line3+1] * scale;b10 += lightmap[line3+2] * scale;
 649                                                 r11 += lightmap[line3+3] * scale;g11 += lightmap[line3+4] * scale;b11 += lightmap[line3+5] * scale;
 650                                                 lightmap += size3;
 651                                         }
 652
 653                                         color[0] += (float) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)) * (1.0f / 256.0f);
 654                                         color[1] += (float) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)) * (1.0f / 256.0f);
 655                                         color[2] += (float) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)) * (1.0f / 256.0f);
 656                                 }
 657                                 return true; // success
 658                         }
 659                 }
 660
 661                 // go down back side
 662                 node = node->children[side ^ 1];
 663                 startz = mid;
 664                 distz = endz - startz;
 665                 goto loc0;
 666 //              return RecursiveLightPoint (color, node->children[side ^ 1], x, y, mid, endz);
 667         }
 668 }
 669
 670 void R_DynamicLightPoint(vec3_t color, vec3_t org, int *dlightbits)
 671 {
 672         int             i, j, k;
 673         vec3_t  dist;
 674         float   brightness, r, f;
 675
 676         if (!r_dynamic.value || (!dlightbits[0] && !dlightbits[1] && !dlightbits[2] && !dlightbits[3] && !dlightbits[4] && !dlightbits[5] && !dlightbits[6] && !dlightbits[7]))
 677                 return;
 678
 679         for (j = 0;j < (MAX_DLIGHTS >> 5);j++)
 680         {
 681                 if (dlightbits[j])
 682                 {
 683                         for (i=0 ; i<32 ; i++)
 684                         {
 685                                 if (!((1 << i) & dlightbits[j]))
 686                                         continue;
 687                                 k = (j<<5)+i;
 688                                 if (cl_dlights[k].die < cl.time || !cl_dlights[k].radius)
 689                                         continue;
 690                                 VectorSubtract (org, cl_dlights[k].origin, dist);
 691                                 f = DotProduct(dist, dist) + LIGHTOFFSET;
 692                                 r = cl_dlights[k].radius*cl_dlights[k].radius;
 693                                 if (f < r)
 694                                 {
 695                                         brightness = r * 128.0f / f;
 696                                         color[0] += brightness * cl_dlights[k].color[0];
 697                                         color[1] += brightness * cl_dlights[k].color[1];
 698                                         color[2] += brightness * cl_dlights[k].color[2];
 699                                 }
 700                         }
 701                 }
 702         }
 703 }
 704
 705 void R_CompleteLightPoint (vec3_t color, vec3_t p)
 706 {
 707         mleaf_t *leaf;
 708         leaf = Mod_PointInLeaf(p, cl.worldmodel);
 709         if (leaf->contents == CONTENTS_SOLID)
 710         {
 711                 color[0] = color[1] = color[2] = 0;
 712                 return;
 713         }
 714
 715         if (r_fullbright.value || !cl.worldmodel->lightdata)
 716         {
 717                 color[0] = color[1] = color[2] = 255;
 718                 return;
 719         }
 720
 721         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 722         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 723
 724         R_DynamicLightPoint(color, p, leaf->dlightbits);
 725 }
 726
 727 void R_ModelLightPoint (vec3_t color, vec3_t p, int *dlightbits)
 728 {
 729         mleaf_t *leaf;
 730         leaf = Mod_PointInLeaf(p, cl.worldmodel);
 731         if (leaf->contents == CONTENTS_SOLID)
 732         {
 733                 color[0] = color[1] = color[2] = 0;
 734                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 735                 return;
 736         }
 737
 738         if (r_fullbright.value || !cl.worldmodel->lightdata)
 739         {
 740                 color[0] = color[1] = color[2] = 255;
 741                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 742                 return;
 743         }
 744
 745         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 746         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 747
 748         if (leaf->dlightframe == r_dlightframecount)
 749         {
 750                 dlightbits[0] = leaf->dlightbits[0];
 751                 dlightbits[1] = leaf->dlightbits[1];
 752                 dlightbits[2] = leaf->dlightbits[2];
 753                 dlightbits[3] = leaf->dlightbits[3];
 754                 dlightbits[4] = leaf->dlightbits[4];
 755                 dlightbits[5] = leaf->dlightbits[5];
 756                 dlightbits[6] = leaf->dlightbits[6];
 757                 dlightbits[7] = leaf->dlightbits[7];
 758         }
 759         else
 760                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 761 }
 762
 763 /* // not currently used
 764 void R_DynamicLightPointNoMask(vec3_t color, vec3_t org)
 765 {
 766         int             i;
 767         vec3_t  dist;
 768         float   brightness, r, f;
 769
 770         if (!r_dynamic.value)
 771                 return;
 772
 773         for (i=0 ; i<MAX_DLIGHTS ; i++)
 774         {
 775                 if (cl_dlights[i].die < cl.time || !cl_dlights[i].radius)
 776                         continue;
 777                 VectorSubtract (org, cl_dlights[i].origin, dist);
 778                 f = DotProduct(dist, dist) + LIGHTOFFSET;
 779                 r = cl_dlights[i].radius*cl_dlights[i].radius;
 780                 if (f < r)
 781                 {
 782                         brightness = r * 256.0f / f;
 783                         if (cl_dlights[i].dark)
 784                                 brightness = -brightness;
 785                         color[0] += brightness * cl_dlights[i].color[0];
 786                         color[1] += brightness * cl_dlights[i].color[1];
 787                         color[2] += brightness * cl_dlights[i].color[2];
 788                 }
 789         }
 790 }
 791 */
 792
 793 extern float *aliasvert;
 794 extern float *aliasvertnorm;
 795 extern byte *aliasvertcolor;
 796 extern float modelalpha;
 797 void R_LightModel(int numverts, vec3_t center, vec3_t basecolor)
 798 {
 799         // LordHavoc: warning: reliance on int being 4 bytes here (of course the d_8to24table relies on that too...)
 800         int i, j, nearlights = 0, color;
 801         vec3_t dist, mod;
 802         float t, t1, t2, t3, *avn;
 803         byte r,g,b,a, *avc;
 804         struct
 805         {
 806                 vec3_t color;
 807                 vec3_t origin;
 808         } nearlight[MAX_DLIGHTS];
 809         int modeldlightbits[8];
 810         avc = aliasvertcolor;
 811         avn = aliasvertnorm;
 812         a = (byte) bound((int) 0, (int) (modelalpha * 255.0f), (int) 255);
 813         if (lighthalf)
 814         {
 815                 mod[0] = currententity->colormod[0] * 0.5f;
 816                 mod[1] = currententity->colormod[1] * 0.5f;
 817                 mod[2] = currententity->colormod[2] * 0.5f;
 818         }
 819         else
 820         {
 821                 mod[0] = currententity->colormod[0];
 822                 mod[1] = currententity->colormod[1];
 823                 mod[2] = currententity->colormod[2];
 824         }
 825         if (currententity->effects & EF_FULLBRIGHT)
 826         {
 827                 ((byte *)&color)[0] = (byte) (255.0f * mod[0]);
 828                 ((byte *)&color)[1] = (byte) (255.0f * mod[1]);
 829                 ((byte *)&color)[2] = (byte) (255.0f * mod[2]);
 830                 ((byte *)&color)[3] = a;
 831                 for (i = 0;i < numverts;i++)
 832                 {
 833                         *((int *)avc) = color;
 834                         avc += 4;
 835                 }
 836                 return;
 837         }
 838         R_ModelLightPoint(basecolor, center, modeldlightbits);
 839
 840         basecolor[0] *= mod[0];
 841         basecolor[1] *= mod[1];
 842         basecolor[2] *= mod[2];
 843         for (i = 0;i < MAX_DLIGHTS;i++)
 844         {
 845                 if (!modeldlightbits[i >> 5])
 846                 {
 847                         i |= 31;
 848                         continue;
 849                 }
 850                 if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
 851                         continue;
 852                 VectorSubtract (center, cl_dlights[i].origin, dist);
 853                 t2 = DotProduct(dist,dist) + LIGHTOFFSET;
 854                 t1 = cl_dlights[i].radius*cl_dlights[i].radius;
 855                 if (t2 < t1)
 856                 {
 857                         // transform the light into the model's coordinate system
 858                         if (gl_transform.value)
 859                                 softwareuntransform(cl_dlights[i].origin, nearlight[nearlights].origin);
 860                         else
 861                         {
 862                                 VectorCopy(cl_dlights[i].origin, nearlight[nearlights].origin);
 863                         }
 864                         nearlight[nearlights].color[0] = cl_dlights[i].color[0] * t1 * mod[0];
 865                         nearlight[nearlights].color[1] = cl_dlights[i].color[1] * t1 * mod[1];
 866                         nearlight[nearlights].color[2] = cl_dlights[i].color[2] * t1 * mod[2];
 867                         if (r_lightmodels.value)
 868                                 nearlights++;
 869                         else
 870                         {
 871                                 t1 = 1.0f / t2;
 872                                 basecolor[0] += nearlight[nearlights].color[0] * t1;
 873                                 basecolor[1] += nearlight[nearlights].color[1] * t1;
 874                                 basecolor[2] += nearlight[nearlights].color[2] * t1;
 875                         }
 876                 }
 877         }
 878         t1 = bound(0, basecolor[0], 255);r = (byte) t1;
 879         t1 = bound(0, basecolor[1], 255);g = (byte) t1;
 880         t1 = bound(0, basecolor[2], 255);b = (byte) t1;
 881         ((byte *)&color)[0] = r;
 882         ((byte *)&color)[1] = g;
 883         ((byte *)&color)[2] = b;
 884         ((byte *)&color)[3] = a;
 885         if (nearlights)
 886         {
 887                 int temp;
 888                 vec3_t v;
 889                 float *av;
 890                 av = aliasvert;
 891                 if (nearlights == 1)
 892                 {
 893                         for (i = 0;i < numverts;i++)
 894                         {
 895                                 VectorSubtract(nearlight[0].origin, av, v);
 896                                 t = DotProduct(avn,v);
 897                                 if (t > 0)
 898                                 {
 899                                         t /= (DotProduct(v,v) + LIGHTOFFSET);
 900                                         temp = (int) ((float) (basecolor[0] + nearlight[0].color[0] * t));
 901                                         avc[0] = bound(0, temp, 255);
 902                                         temp = (int) ((float) (basecolor[1] + nearlight[0].color[1] * t));
 903                                         avc[1] = bound(0, temp, 255);
 904                                         temp = (int) ((float) (basecolor[2] + nearlight[0].color[2] * t));
 905                                         avc[2] = bound(0, temp, 255);
 906                                         avc[3] = a;
 907                                 }
 908                                 else
 909                                         *((int *)avc) = color;
 910                                 avc += 4;
 911                                 av += 3;
 912                                 avn += 3;
 913                         }
 914                 }
 915                 else
 916                 {
 917                         for (i = 0;i < numverts;i++)
 918                         {
 919                                 int lit;
 920                                 t1 = basecolor[0];
 921                                 t2 = basecolor[1];
 922                                 t3 = basecolor[2];
 923                                 lit = false;
 924                                 for (j = 0;j < nearlights;j++)
 925                                 {
 926                                         VectorSubtract(nearlight[j].origin, av, v);
 927                                         t = DotProduct(avn,v);
 928                                         if (t > 0)
 929                                         {
 930                                                 t /= (DotProduct(v,v) + LIGHTOFFSET);
 931                                                 t1 += nearlight[j].color[0] * t;
 932                                                 t2 += nearlight[j].color[1] * t;
 933                                                 t3 += nearlight[j].color[2] * t;
 934                                                 lit = true;
 935                                         }
 936                                 }
 937                                 if (lit)
 938                                 {
 939                                         int i1, i2, i3;
 940                                         i1 = (int) t1;
 941                                         avc[0] = bound(0, i1, 255);
 942                                         i2 = (int) t2;
 943                                         avc[1] = bound(0, i2, 255);
 944                                         i3 = (int) t3;
 945                                         avc[2] = bound(0, i3, 255);
 946                                         avc[3] = a;
 947                                 }
 948                                 else // dodge the costly float -> int conversions
 949                                         *((int *)avc) = color;
 950                                 avc += 4;
 951                                 av += 3;
 952                                 avn += 3;
 953                         }
 954                 }
 955         }
 956         else
 957         {
 958                 for (i = 0;i < numverts;i++)
 959                 {
 960                         *((int *)avc) = color;
 961                         avc += 4;
 962                 }
 963         }
 964 }