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 void r_light_start(void)
  27 {
  28 }
  29
  30 void r_light_shutdown(void)
  31 {
  32 }
  33
  34 void r_light_newmap(void)
  35 {
  36 }
  37
  38 void R_Light_Init(void)
  39 {
  40         Cvar_RegisterVariable(&r_lightmodels);
  41         R_RegisterModule("R_Light", r_light_start, r_light_shutdown, r_light_newmap);
  42 }
  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         mleaf_t         *leaf;
  89         int                     i;
  90
  91         if (!r_dynamic.value)
  92                 return;
  93
  94         // for comparisons to minimum acceptable light
  95         maxdist = light->radius * light->radius;
  96
  97         // clamp radius to avoid exceeding 32768 entry division table
  98         if (maxdist > 4194304)
  99                 maxdist = 4194304;
 100
 101 loc0:
 102         if (node->contents < 0)
 103         {
 104                 if (node->contents != CONTENTS_SOLID)
 105                 {
 106                         leaf = (mleaf_t *)node;
 107                         if (leaf->dlightframe != r_framecount) // not dynamic until now
 108                         {
 109                                 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;
 110                                 leaf->dlightframe = r_framecount;
 111                         }
 112                         leaf->dlightbits[bitindex] |= bit;
 113                 }
 114                 return;
 115         }
 116
 117         ndist = PlaneDiff(lightorigin, node->plane);
 118
 119         if (ndist > light->radius)
 120         {
 121                 node = node->children[0];
 122                 goto loc0;
 123         }
 124         if (ndist < -light->radius)
 125         {
 126                 node = node->children[1];
 127                 goto loc0;
 128         }
 129
 130 // mark the polygons
 131         surf = cl.worldmodel->surfaces + node->firstsurface;
 132         for (i=0 ; i<node->numsurfaces ; i++, surf++)
 133         {
 134                 int d;
 135                 float dist, dist2, impact[3];
 136                 if (surf->visframe != r_framecount)
 137                         continue;
 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_framecount) // 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_framecount;
 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_framecount) // 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_framecount;
 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                                                 if (leaf->visframe != r_framecount)
 288                                                         continue;
 289                                                 if (leaf->contents == CONTENTS_SOLID)
 290                                                         continue;
 291                                                 // if out of the light radius, skip
 292                                                 if (leaf->mins[0] > high[0] || leaf->maxs[0] < low[0]
 293                                                  || leaf->mins[1] > high[1] || leaf->maxs[1] < low[1]
 294                                                  || leaf->mins[2] > high[2] || leaf->maxs[2] < low[2])
 295                                                         continue;
 296                                                 if (leaf->dlightframe != r_framecount) // not dynamic until now
 297                                                 {
 298                                                         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;
 299                                                         leaf->dlightframe = r_framecount;
 300                                                 }
 301                                                 leaf->dlightbits[bitindex] |= bit;
 302                                                 if ((m = leaf->nummarksurfaces))
 303                                                 {
 304                                                         mark = leaf->firstmarksurface;
 305                                                         do
 306                                                         {
 307                                                                 surf = *mark++;
 308                                                                 if (surf->visframe != r_framecount || surf->lightframe == lightframe)
 309                                                                         continue;
 310                                                                 surf->lightframe = lightframe;
 311                                                                 dist = PlaneDiff(lightorigin, surf->plane);
 312                                                                 if (surf->flags & SURF_PLANEBACK)
 313                                                                         dist = -dist;
 314                                                                 // LordHavoc: make sure it is infront of the surface and not too far away
 315                                                                 if ((dist >= -0.25f || (surf->flags & SURF_LIGHTBOTHSIDES)) && dist < radius)
 316                                                                 {
 317                                                                         int d;
 318                                                                         float dist2, impact[3];
 319
 320                                                                         dist2 = dist * dist;
 321
 322                                                                         impact[0] = light->origin[0] - surf->plane->normal[0] * dist;
 323                                                                         impact[1] = light->origin[1] - surf->plane->normal[1] * dist;
 324                                                                         impact[2] = light->origin[2] - surf->plane->normal[2] * dist;
 325
 326                                                                         d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 327
 328                                                                         if (d < 0)
 329                                                                         {
 330                                                                                 dist2 += d * d;
 331                                                                                 if (dist2 >= maxdist)
 332                                                                                         continue;
 333                                                                         }
 334                                                                         else
 335                                                                         {
 336                                                                                 d -= surf->extents[0] + 16;
 337                                                                                 if (d > 0)
 338                                                                                 {
 339                                                                                         dist2 += d * d;
 340                                                                                         if (dist2 >= maxdist)
 341                                                                                                 continue;
 342                                                                                 }
 343                                                                         }
 344
 345                                                                         d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 346
 347                                                                         if (d < 0)
 348                                                                         {
 349                                                                                 dist2 += d * d;
 350                                                                                 if (dist2 >= maxdist)
 351                                                                                         continue;
 352                                                                         }
 353                                                                         else
 354                                                                         {
 355                                                                                 d -= surf->extents[1] + 16;
 356                                                                                 if (d > 0)
 357                                                                                 {
 358                                                                                         dist2 += d * d;
 359                                                                                         if (dist2 >= maxdist)
 360                                                                                                 continue;
 361                                                                                 }
 362                                                                         }
 363
 364                                                                         if (surf->dlightframe != r_framecount) // not dynamic until now
 365                                                                         {
 366                                                                                 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;
 367                                                                                 surf->dlightframe = r_framecount;
 368                                                                         }
 369                                                                         surf->dlightbits[bitindex] |= bit;
 370                                                                 }
 371                                                         }
 372                                                         while (--m);
 373                                                 }
 374                                         }
 375                                 }
 376                                 k++;
 377                                 continue;
 378                         }
 379
 380                         k += *in++;
 381                 }
 382         }
 383 }
 384
 385
 386 /*
 387 =============
 388 R_PushDlights
 389 =============
 390 */
 391 void R_PushDlights (void)
 392 {
 393         int             i;
 394         dlight_t        *l;
 395
 396         if (!r_dynamic.value)
 397                 return;
 398
 399         l = cl_dlights;
 400
 401         for (i=0 ; i<MAX_DLIGHTS ; i++, l++)
 402         {
 403                 if (!l->radius)
 404                         continue;
 405 //              R_MarkLights (l->origin, l, 1<<(i&31), i >> 5, cl.worldmodel->nodes );
 406                 R_VisMarkLights (l->origin, l, 1<<(i&31), i >> 5, cl.worldmodel);
 407         }
 408 }
 409
 410
 411 /*
 412 =============================================================================
 413
 414 LIGHT SAMPLING
 415
 416 =============================================================================
 417 */
 418
 419 mplane_t                *lightplane;
 420 vec3_t                  lightspot;
 421
 422 /*
 423 int RecursiveLightPoint (vec3_t color, mnode_t *node, vec3_t start, vec3_t end)
 424 {
 425         float           front, back, frac;
 426         vec3_t          mid;
 427
 428 loc0:
 429         if (node->contents < 0)
 430                 return false;           // didn't hit anything
 431
 432 // calculate mid point
 433         front = PlaneDiff (start, node->plane);
 434         back = PlaneDiff (end, node->plane);
 435
 436         // LordHavoc: optimized recursion
 437         if ((back < 0) == (front < 0))
 438 //              return RecursiveLightPoint (color, node->children[front < 0], start, end);
 439         {
 440                 node = node->children[front < 0];
 441                 goto loc0;
 442         }
 443
 444         frac = front / (front-back);
 445         mid[0] = start[0] + (end[0] - start[0])*frac;
 446         mid[1] = start[1] + (end[1] - start[1])*frac;
 447         mid[2] = start[2] + (end[2] - start[2])*frac;
 448
 449 // go down front side
 450         if (RecursiveLightPoint (color, node->children[front < 0], start, mid))
 451                 return true;    // hit something
 452         else
 453         {
 454                 int i, ds, dt;
 455                 msurface_t *surf;
 456         // check for impact on this node
 457                 VectorCopy (mid, lightspot);
 458                 lightplane = node->plane;
 459
 460                 surf = cl.worldmodel->surfaces + node->firstsurface;
 461                 for (i = 0;i < node->numsurfaces;i++, surf++)
 462                 {
 463                         if (surf->flags & SURF_DRAWTILED)
 464                                 continue;       // no lightmaps
 465
 466                         ds = (int) ((float) DotProduct (mid, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3]);
 467                         dt = (int) ((float) DotProduct (mid, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3]);
 468
 469                         if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 470                                 continue;
 471
 472                         ds -= surf->texturemins[0];
 473                         dt -= surf->texturemins[1];
 474
 475                         if (ds > surf->extents[0] || dt > surf->extents[1])
 476                                 continue;
 477
 478                         if (surf->samples)
 479                         {
 480                                 byte *lightmap;
 481                                 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;
 482                                 float scale;
 483                                 line3 = ((surf->extents[0]>>4)+1)*3;
 484
 485                                 lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 486
 487                                 for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 488                                 {
 489                                         scale = (float) d_lightstylevalue[surf->styles[maps]] * 1.0 / 256.0;
 490                                         r00 += (float) lightmap[      0] * scale;g00 += (float) lightmap[      1] * scale;b00 += (float) lightmap[2] * scale;
 491                                         r01 += (float) lightmap[      3] * scale;g01 += (float) lightmap[      4] * scale;b01 += (float) lightmap[5] * scale;
 492                                         r10 += (float) lightmap[line3+0] * scale;g10 += (float) lightmap[line3+1] * scale;b10 += (float) lightmap[line3+2] * scale;
 493                                         r11 += (float) lightmap[line3+3] * scale;g11 += (float) lightmap[line3+4] * scale;b11 += (float) lightmap[line3+5] * scale;
 494                                         lightmap += ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 495                                 }
 496
 497                                 color[0] += (float) ((int) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)));
 498                                 color[1] += (float) ((int) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)));
 499                                 color[2] += (float) ((int) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)));
 500                         }
 501                         return true; // success
 502                 }
 503
 504         // go down back side
 505                 return RecursiveLightPoint (color, node->children[front >= 0], mid, end);
 506         }
 507 }
 508
 509 void R_LightPoint (vec3_t color, vec3_t p)
 510 {
 511         vec3_t          end;
 512
 513         if (r_fullbright.value || !cl.worldmodel->lightdata)
 514         {
 515                 color[0] = color[1] = color[2] = 255;
 516                 return;
 517         }
 518
 519         end[0] = p[0];
 520         end[1] = p[1];
 521         end[2] = p[2] - 2048;
 522
 523         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 524         RecursiveLightPoint (color, cl.worldmodel->nodes, p, end);
 525 }
 526
 527 void SV_LightPoint (vec3_t color, vec3_t p)
 528 {
 529         vec3_t          end;
 530
 531         if (!sv.worldmodel->lightdata)
 532         {
 533                 color[0] = color[1] = color[2] = 255;
 534                 return;
 535         }
 536
 537         end[0] = p[0];
 538         end[1] = p[1];
 539         end[2] = p[2] - 2048;
 540
 541         color[0] = color[1] = color[2] = 0;
 542         RecursiveLightPoint (color, sv.worldmodel->nodes, p, end);
 543 }
 544 */
 545
 546 int RecursiveLightPoint (vec3_t color, mnode_t *node, float x, float y, float startz, float endz)
 547 {
 548         int             side, distz = endz - startz;
 549         float   front, back;
 550         float   mid;
 551
 552 loc0:
 553         if (node->contents < 0)
 554                 return false;           // didn't hit anything
 555
 556         switch (node->plane->type)
 557         {
 558         case PLANE_X:
 559                 node = node->children[x < node->plane->dist];
 560                 goto loc0;
 561         case PLANE_Y:
 562                 node = node->children[y < node->plane->dist];
 563                 goto loc0;
 564         case PLANE_Z:
 565                 side = startz < node->plane->dist;
 566                 if ((endz < node->plane->dist) == side)
 567                 {
 568                         node = node->children[side];
 569                         goto loc0;
 570                 }
 571                 // found an intersection
 572 //              mid = startz + (endz - startz) * (startz - node->plane->dist) / (startz - endz);
 573 //              mid = startz + distz * (startz - node->plane->dist) / (-distz);
 574 //              mid = startz + (-(startz - node->plane->dist));
 575 //              mid = startz - (startz - node->plane->dist);
 576 //              mid = startz + node->plane->dist - startz;
 577                 mid = node->plane->dist;
 578                 break;
 579         default:
 580                 back = front = x * node->plane->normal[0] + y * node->plane->normal[1];
 581                 front += startz * node->plane->normal[2];
 582                 back += endz * node->plane->normal[2];
 583                 side = front < node->plane->dist;
 584                 if ((back < node->plane->dist) == side)
 585                 {
 586                         node = node->children[side];
 587                         goto loc0;
 588                 }
 589                 // found an intersection
 590 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / ((front - node->plane->dist) - (back - node->plane->dist)));
 591 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / (front - back));
 592                 mid = startz + distz * (front - node->plane->dist) / (front - back);
 593                 break;
 594         }
 595
 596         // go down front side
 597         if (node->children[side]->contents >= 0 && RecursiveLightPoint (color, node->children[side], x, y, startz, mid))
 598                 return true;    // hit something
 599         else
 600         {
 601                 // check for impact on this node
 602                 if (node->numsurfaces)
 603                 {
 604                         int i, ds, dt;
 605                         msurface_t *surf;
 606                         lightspot[0] = x;
 607                         lightspot[1] = y;
 608                         lightspot[2] = mid;
 609                         lightplane = node->plane;
 610
 611                         surf = cl.worldmodel->surfaces + node->firstsurface;
 612                         for (i = 0;i < node->numsurfaces;i++, surf++)
 613                         {
 614                                 if (surf->flags & SURF_DRAWTILED)
 615                                         continue;       // no lightmaps
 616
 617                                 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]);
 618                                 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]);
 619
 620                                 if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 621                                         continue;
 622
 623                                 ds -= surf->texturemins[0];
 624                                 dt -= surf->texturemins[1];
 625
 626                                 if (ds > surf->extents[0] || dt > surf->extents[1])
 627                                         continue;
 628
 629                                 if (surf->samples)
 630                                 {
 631                                         byte *lightmap;
 632                                         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;
 633                                         line3 = ((surf->extents[0]>>4)+1)*3;
 634                                         size3 = ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 635
 636                                         lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 637
 638                                         for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 639                                         {
 640                                                 scale = d_lightstylevalue[surf->styles[maps]];
 641                                                 r00 += lightmap[      0] * scale;g00 += lightmap[      1] * scale;b00 += lightmap[      2] * scale;
 642                                                 r01 += lightmap[      3] * scale;g01 += lightmap[      4] * scale;b01 += lightmap[      5] * scale;
 643                                                 r10 += lightmap[line3+0] * scale;g10 += lightmap[line3+1] * scale;b10 += lightmap[line3+2] * scale;
 644                                                 r11 += lightmap[line3+3] * scale;g11 += lightmap[line3+4] * scale;b11 += lightmap[line3+5] * scale;
 645                                                 lightmap += size3;
 646                                         }
 647
 648                                         color[0] += (float) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)) * (1.0f / 256.0f);
 649                                         color[1] += (float) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)) * (1.0f / 256.0f);
 650                                         color[2] += (float) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)) * (1.0f / 256.0f);
 651                                 }
 652                                 return true; // success
 653                         }
 654                 }
 655
 656                 // go down back side
 657                 node = node->children[side ^ 1];
 658                 startz = mid;
 659                 distz = endz - startz;
 660                 goto loc0;
 661 //              return RecursiveLightPoint (color, node->children[side ^ 1], x, y, mid, endz);
 662         }
 663 }
 664
 665 void R_DynamicLightPoint(vec3_t color, vec3_t org, int *dlightbits)
 666 {
 667         int             i, j, k;
 668         vec3_t  dist;
 669         float   brightness, r, f;
 670
 671         if (!r_dynamic.value || (!dlightbits[0] && !dlightbits[1] && !dlightbits[2] && !dlightbits[3] && !dlightbits[4] && !dlightbits[5] && !dlightbits[6] && !dlightbits[7]))
 672                 return;
 673
 674         for (j = 0;j < (MAX_DLIGHTS >> 5);j++)
 675         {
 676                 if (dlightbits[j])
 677                 {
 678                         for (i=0 ; i<32 ; i++)
 679                         {
 680                                 if (!((1 << i) & dlightbits[j]))
 681                                         continue;
 682                                 k = (j<<5)+i;
 683                                 if (!cl_dlights[k].radius)
 684                                         continue;
 685                                 VectorSubtract (org, cl_dlights[k].origin, dist);
 686                                 f = DotProduct(dist, dist) + LIGHTOFFSET;
 687                                 r = cl_dlights[k].radius*cl_dlights[k].radius;
 688                                 if (f < r)
 689                                 {
 690                                         brightness = r * 128.0f / f;
 691                                         color[0] += brightness * cl_dlights[k].color[0];
 692                                         color[1] += brightness * cl_dlights[k].color[1];
 693                                         color[2] += brightness * cl_dlights[k].color[2];
 694                                 }
 695                         }
 696                 }
 697         }
 698 }
 699
 700 void R_CompleteLightPoint (vec3_t color, vec3_t p, int dynamic)
 701 {
 702         mleaf_t *leaf;
 703         leaf = Mod_PointInLeaf(p, cl.worldmodel);
 704         if (leaf->contents == CONTENTS_SOLID)
 705         {
 706                 color[0] = color[1] = color[2] = 0;
 707                 return;
 708         }
 709
 710         if (r_fullbright.value || !cl.worldmodel->lightdata)
 711         {
 712                 color[0] = color[1] = color[2] = 255;
 713                 return;
 714         }
 715
 716         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 717         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 718
 719         if (dynamic)
 720                 R_DynamicLightPoint(color, p, leaf->dlightbits);
 721 }
 722
 723 void R_ModelLightPoint (vec3_t color, vec3_t p, int *dlightbits)
 724 {
 725         mleaf_t *leaf;
 726         leaf = Mod_PointInLeaf(p, cl.worldmodel);
 727         if (leaf->contents == CONTENTS_SOLID)
 728         {
 729                 color[0] = color[1] = color[2] = 0;
 730                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 731                 return;
 732         }
 733
 734         if (r_fullbright.value || !cl.worldmodel->lightdata)
 735         {
 736                 color[0] = color[1] = color[2] = 255;
 737                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 738                 return;
 739         }
 740
 741         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 742         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 743
 744         if (leaf->dlightframe == r_framecount)
 745         {
 746                 dlightbits[0] = leaf->dlightbits[0];
 747                 dlightbits[1] = leaf->dlightbits[1];
 748                 dlightbits[2] = leaf->dlightbits[2];
 749                 dlightbits[3] = leaf->dlightbits[3];
 750                 dlightbits[4] = leaf->dlightbits[4];
 751                 dlightbits[5] = leaf->dlightbits[5];
 752                 dlightbits[6] = leaf->dlightbits[6];
 753                 dlightbits[7] = leaf->dlightbits[7];
 754         }
 755         else
 756                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 757 }
 758
 759 /* // not currently used
 760 void R_DynamicLightPointNoMask(vec3_t color, vec3_t org)
 761 {
 762         int             i;
 763         vec3_t  dist;
 764         float   brightness, r, f;
 765
 766         if (!r_dynamic.value)
 767                 return;
 768
 769         for (i=0 ; i<MAX_DLIGHTS ; i++)
 770         {
 771                 if (!cl_dlights[i].radius)
 772                         continue;
 773                 VectorSubtract (org, cl_dlights[i].origin, dist);
 774                 f = DotProduct(dist, dist) + LIGHTOFFSET;
 775                 r = cl_dlights[i].radius*cl_dlights[i].radius;
 776                 if (f < r)
 777                 {
 778                         brightness = r * 256.0f / f;
 779                         if (cl_dlights[i].dark)
 780                                 brightness = -brightness;
 781                         color[0] += brightness * cl_dlights[i].color[0];
 782                         color[1] += brightness * cl_dlights[i].color[1];
 783                         color[2] += brightness * cl_dlights[i].color[2];
 784                 }
 785         }
 786 }
 787 */
 788
 789 void R_LightModel(entity_t *ent, int numverts, vec3_t center, vec3_t basecolor)
 790 {
 791         // LordHavoc: warning: reliance on int being 4 bytes here (of course the d_8to24table relies on that too...)
 792         int i, j, nearlights = 0, color;
 793         vec3_t dist, mod;
 794         float t, t1, t2, t3, *avn;
 795         byte r,g,b,a, *avc;
 796         struct
 797         {
 798                 vec3_t color;
 799                 vec3_t origin;
 800         } nearlight[MAX_DLIGHTS];
 801         int modeldlightbits[8];
 802         avc = aliasvertcolor;
 803         avn = aliasvertnorm;
 804         a = (byte) bound((int) 0, (int) (modelalpha * 255.0f), (int) 255);
 805         if (lighthalf)
 806         {
 807                 mod[0] = ent->render.colormod[0] * 0.5f;
 808                 mod[1] = ent->render.colormod[1] * 0.5f;
 809                 mod[2] = ent->render.colormod[2] * 0.5f;
 810         }
 811         else
 812         {
 813                 mod[0] = ent->render.colormod[0];
 814                 mod[1] = ent->render.colormod[1];
 815                 mod[2] = ent->render.colormod[2];
 816         }
 817         if (ent->render.effects & EF_FULLBRIGHT)
 818         {
 819                 ((byte *)&color)[0] = (byte) (255.0f * mod[0]);
 820                 ((byte *)&color)[1] = (byte) (255.0f * mod[1]);
 821                 ((byte *)&color)[2] = (byte) (255.0f * mod[2]);
 822                 ((byte *)&color)[3] = a;
 823                 for (i = 0;i < numverts;i++)
 824                 {
 825                         *((int *)avc) = color;
 826                         avc += 4;
 827                 }
 828                 return;
 829         }
 830         R_ModelLightPoint(basecolor, center, modeldlightbits);
 831
 832         basecolor[0] *= mod[0];
 833         basecolor[1] *= mod[1];
 834         basecolor[2] *= mod[2];
 835         for (i = 0;i < MAX_DLIGHTS;i++)
 836         {
 837                 if (!modeldlightbits[i >> 5])
 838                 {
 839                         i |= 31;
 840                         continue;
 841                 }
 842                 if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
 843                         continue;
 844                 VectorSubtract (center, cl_dlights[i].origin, dist);
 845                 t2 = DotProduct(dist,dist) + LIGHTOFFSET;
 846                 t1 = cl_dlights[i].radius*cl_dlights[i].radius;
 847                 if (t2 < t1)
 848                 {
 849                         // transform the light into the model's coordinate system
 850                         if (gl_transform.value)
 851                                 softwareuntransform(cl_dlights[i].origin, nearlight[nearlights].origin);
 852                         else
 853                         {
 854                                 VectorCopy(cl_dlights[i].origin, nearlight[nearlights].origin);
 855                         }
 856                         nearlight[nearlights].color[0] = cl_dlights[i].color[0] * t1 * mod[0];
 857                         nearlight[nearlights].color[1] = cl_dlights[i].color[1] * t1 * mod[1];
 858                         nearlight[nearlights].color[2] = cl_dlights[i].color[2] * t1 * mod[2];
 859                         if (r_lightmodels.value && (ent == NULL || ent != cl_dlights[i].ent))
 860                                 nearlights++;
 861                         else
 862                         {
 863                                 t1 = 1.0f / t2;
 864                                 basecolor[0] += nearlight[nearlights].color[0] * t1;
 865                                 basecolor[1] += nearlight[nearlights].color[1] * t1;
 866                                 basecolor[2] += nearlight[nearlights].color[2] * t1;
 867                         }
 868                 }
 869         }
 870         t1 = bound(0, basecolor[0], 255);r = (byte) t1;
 871         t1 = bound(0, basecolor[1], 255);g = (byte) t1;
 872         t1 = bound(0, basecolor[2], 255);b = (byte) t1;
 873         ((byte *)&color)[0] = r;
 874         ((byte *)&color)[1] = g;
 875         ((byte *)&color)[2] = b;
 876         ((byte *)&color)[3] = a;
 877         if (nearlights)
 878         {
 879                 int temp;
 880                 vec3_t v;
 881                 float *av;
 882                 av = aliasvert;
 883                 if (nearlights == 1)
 884                 {
 885                         for (i = 0;i < numverts;i++)
 886                         {
 887                                 VectorSubtract(nearlight[0].origin, av, v);
 888                                 t = DotProduct(avn,v);
 889                                 if (t > 0)
 890                                 {
 891                                         t /= (DotProduct(v,v) + LIGHTOFFSET);
 892                                         temp = (int) ((float) (basecolor[0] + nearlight[0].color[0] * t));
 893                                         avc[0] = bound(0, temp, 255);
 894                                         temp = (int) ((float) (basecolor[1] + nearlight[0].color[1] * t));
 895                                         avc[1] = bound(0, temp, 255);
 896                                         temp = (int) ((float) (basecolor[2] + nearlight[0].color[2] * t));
 897                                         avc[2] = bound(0, temp, 255);
 898                                         avc[3] = a;
 899                                 }
 900                                 else
 901                                         *((int *)avc) = color;
 902                                 avc += 4;
 903                                 av += 3;
 904                                 avn += 3;
 905                         }
 906                 }
 907                 else
 908                 {
 909                         for (i = 0;i < numverts;i++)
 910                         {
 911                                 int lit;
 912                                 t1 = basecolor[0];
 913                                 t2 = basecolor[1];
 914                                 t3 = basecolor[2];
 915                                 lit = false;
 916                                 for (j = 0;j < nearlights;j++)
 917                                 {
 918                                         VectorSubtract(nearlight[j].origin, av, v);
 919                                         t = DotProduct(avn,v);
 920                                         if (t > 0)
 921                                         {
 922                                                 t /= (DotProduct(v,v) + LIGHTOFFSET);
 923                                                 t1 += nearlight[j].color[0] * t;
 924                                                 t2 += nearlight[j].color[1] * t;
 925                                                 t3 += nearlight[j].color[2] * t;
 926                                                 lit = true;
 927                                         }
 928                                 }
 929                                 if (lit)
 930                                 {
 931                                         int i1, i2, i3;
 932                                         i1 = (int) t1;
 933                                         avc[0] = bound(0, i1, 255);
 934                                         i2 = (int) t2;
 935                                         avc[1] = bound(0, i2, 255);
 936                                         i3 = (int) t3;
 937                                         avc[2] = bound(0, i3, 255);
 938                                         avc[3] = a;
 939                                 }
 940                                 else // dodge the costly float -> int conversions
 941                                         *((int *)avc) = color;
 942                                 avc += 4;
 943                                 av += 3;
 944                                 avn += 3;
 945                         }
 946                 }
 947         }
 948         else
 949         {
 950                 for (i = 0;i < numverts;i++)
 951                 {
 952                         *((int *)avc) = color;
 953                         avc += 4;
 954                 }
 955         }
 956 }