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 cvar_t r_modelsdonttransformnormals = {"r_modelsdonttransformnormals", "0"};
  26
  27 void r_light_start()
  28 {
  29 }
  30
  31 void r_light_shutdown()
  32 {
  33 }
  34
  35 void R_Light_Init()
  36 {
  37         Cvar_RegisterVariable(&r_lightmodels);
  38         Cvar_RegisterVariable(&r_modelsdonttransformnormals);
  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 * LIGHTSCALE;
  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)
 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                 radius = light->radius * LIGHTSCALE1;
 260
 261                 // clamp radius to avoid exceeding 32768 entry division table
 262                 if (radius > 2048)
 263                         radius = 2048;
 264
 265                 low[0] = lightorigin[0] - radius;low[1] = lightorigin[1] - radius;low[2] = lightorigin[2] - radius;
 266                 high[0] = lightorigin[0] + radius;high[1] = lightorigin[1] + radius;high[2] = lightorigin[2] + radius;
 267
 268                 // for comparisons to minimum acceptable light
 269                 maxdist = radius*radius;
 270
 271                 lightframe++;
 272                 k = 0;
 273                 while (k < row)
 274                 {
 275                         c = *in++;
 276                         if (c)
 277                         {
 278                                 l = model->numleafs - (k << 3);
 279                                 if (l > 8)
 280                                         l = 8;
 281                                 for (i=0 ; i<l ; i++)
 282                                 {
 283                                         if (c & (1<<i))
 284                                         {
 285                                                 leaf = &model->leafs[(k << 3)+i+1];
 286                                                 leaf->lightframe = lightframe;
 287                                                 if (leaf->visframe != r_visframecount)
 288                                                         continue;
 289                                                 if (leaf->contents == CONTENTS_SOLID)
 290                                                         continue;
 291                                                 // if out of the light radius, skip
 292                                                 if (leaf->minmaxs[0] > high[0] || leaf->minmaxs[3] < low[0]
 293                                                  || leaf->minmaxs[1] > high[1] || leaf->minmaxs[4] < low[1]
 294                                                  || leaf->minmaxs[2] > high[2] || leaf->minmaxs[5] < low[2])
 295                                                         continue;
 296                                                 if (leaf->dlightframe != r_dlightframecount) // 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_dlightframecount;
 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 && 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_dlightframecount) // 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_dlightframecount;
 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         r_dlightframecount = r_framecount + 1;  // because the count hasn't advanced yet for this frame
 397
 398         if (!r_dynamic.value)
 399                 return;
 400
 401         l = cl_dlights;
 402
 403         for (i=0 ; i<MAX_DLIGHTS ; i++, l++)
 404         {
 405                 if (l->die < cl.time || !l->radius)
 406                         continue;
 407 //              R_MarkLights (l->origin, l, 1<<(i&31), i >> 5, cl.worldmodel->nodes );
 408                 R_VisMarkLights (l->origin, l, 1<<(i&31), i >> 5, cl.worldmodel);
 409         }
 410 }
 411
 412
 413 /*
 414 =============================================================================
 415
 416 LIGHT SAMPLING
 417
 418 =============================================================================
 419 */
 420
 421 mplane_t                *lightplane;
 422 vec3_t                  lightspot;
 423
 424 extern cvar_t r_ambient;
 425
 426 /*
 427 int RecursiveLightPoint (vec3_t color, mnode_t *node, vec3_t start, vec3_t end)
 428 {
 429         float           front, back, frac;
 430         vec3_t          mid;
 431
 432 loc0:
 433         if (node->contents < 0)
 434                 return false;           // didn't hit anything
 435
 436 // calculate mid point
 437         front = PlaneDiff (start, node->plane);
 438         back = PlaneDiff (end, node->plane);
 439
 440         // LordHavoc: optimized recursion
 441         if ((back < 0) == (front < 0))
 442 //              return RecursiveLightPoint (color, node->children[front < 0], start, end);
 443         {
 444                 node = node->children[front < 0];
 445                 goto loc0;
 446         }
 447
 448         frac = front / (front-back);
 449         mid[0] = start[0] + (end[0] - start[0])*frac;
 450         mid[1] = start[1] + (end[1] - start[1])*frac;
 451         mid[2] = start[2] + (end[2] - start[2])*frac;
 452
 453 // go down front side
 454         if (RecursiveLightPoint (color, node->children[front < 0], start, mid))
 455                 return true;    // hit something
 456         else
 457         {
 458                 int i, ds, dt;
 459                 msurface_t *surf;
 460         // check for impact on this node
 461                 VectorCopy (mid, lightspot);
 462                 lightplane = node->plane;
 463
 464                 surf = cl.worldmodel->surfaces + node->firstsurface;
 465                 for (i = 0;i < node->numsurfaces;i++, surf++)
 466                 {
 467                         if (surf->flags & SURF_DRAWTILED)
 468                                 continue;       // no lightmaps
 469
 470                         ds = (int) ((float) DotProduct (mid, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3]);
 471                         dt = (int) ((float) DotProduct (mid, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3]);
 472
 473                         if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 474                                 continue;
 475
 476                         ds -= surf->texturemins[0];
 477                         dt -= surf->texturemins[1];
 478
 479                         if (ds > surf->extents[0] || dt > surf->extents[1])
 480                                 continue;
 481
 482                         if (surf->samples)
 483                         {
 484                                 byte *lightmap;
 485                                 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;
 486                                 float scale;
 487                                 line3 = ((surf->extents[0]>>4)+1)*3;
 488
 489                                 lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 490
 491                                 for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 492                                 {
 493                                         scale = (float) d_lightstylevalue[surf->styles[maps]] * 1.0 / 256.0;
 494                                         r00 += (float) lightmap[      0] * scale;g00 += (float) lightmap[      1] * scale;b00 += (float) lightmap[2] * scale;
 495                                         r01 += (float) lightmap[      3] * scale;g01 += (float) lightmap[      4] * scale;b01 += (float) lightmap[5] * scale;
 496                                         r10 += (float) lightmap[line3+0] * scale;g10 += (float) lightmap[line3+1] * scale;b10 += (float) lightmap[line3+2] * scale;
 497                                         r11 += (float) lightmap[line3+3] * scale;g11 += (float) lightmap[line3+4] * scale;b11 += (float) lightmap[line3+5] * scale;
 498                                         lightmap += ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 499                                 }
 500
 501                                 color[0] += (float) ((int) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)));
 502                                 color[1] += (float) ((int) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)));
 503                                 color[2] += (float) ((int) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)));
 504                         }
 505                         return true; // success
 506                 }
 507
 508         // go down back side
 509                 return RecursiveLightPoint (color, node->children[front >= 0], mid, end);
 510         }
 511 }
 512
 513 void R_LightPoint (vec3_t color, vec3_t p)
 514 {
 515         vec3_t          end;
 516
 517         if (r_fullbright.value || !cl.worldmodel->lightdata)
 518         {
 519                 color[0] = color[1] = color[2] = 255;
 520                 return;
 521         }
 522
 523         end[0] = p[0];
 524         end[1] = p[1];
 525         end[2] = p[2] - 2048;
 526
 527         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 528         RecursiveLightPoint (color, cl.worldmodel->nodes, p, end);
 529 }
 530
 531 void SV_LightPoint (vec3_t color, vec3_t p)
 532 {
 533         vec3_t          end;
 534
 535         if (!sv.worldmodel->lightdata)
 536         {
 537                 color[0] = color[1] = color[2] = 255;
 538                 return;
 539         }
 540
 541         end[0] = p[0];
 542         end[1] = p[1];
 543         end[2] = p[2] - 2048;
 544
 545         color[0] = color[1] = color[2] = 0;
 546         RecursiveLightPoint (color, sv.worldmodel->nodes, p, end);
 547 }
 548 */
 549
 550 int RecursiveLightPoint (vec3_t color, mnode_t *node, float x, float y, float startz, float endz)
 551 {
 552         int             side, distz = endz - startz;
 553         float   front, back;
 554         float   mid;
 555
 556 loc0:
 557         if (node->contents < 0)
 558                 return false;           // didn't hit anything
 559
 560         switch (node->plane->type)
 561         {
 562         case PLANE_X:
 563                 node = node->children[x < node->plane->dist];
 564                 goto loc0;
 565         case PLANE_Y:
 566                 node = node->children[y < node->plane->dist];
 567                 goto loc0;
 568         case PLANE_Z:
 569                 side = startz < node->plane->dist;
 570                 if ((endz < node->plane->dist) == side)
 571                 {
 572                         node = node->children[side];
 573                         goto loc0;
 574                 }
 575                 // found an intersection
 576 //              mid = startz + (endz - startz) * (startz - node->plane->dist) / (startz - endz);
 577 //              mid = startz + distz * (startz - node->plane->dist) / (-distz);
 578 //              mid = startz + (-(startz - node->plane->dist));
 579 //              mid = startz - (startz - node->plane->dist);
 580 //              mid = startz + node->plane->dist - startz;
 581                 mid = node->plane->dist;
 582                 break;
 583         default:
 584                 back = front = x * node->plane->normal[0] + y * node->plane->normal[1];
 585                 front += startz * node->plane->normal[2];
 586                 back += endz * node->plane->normal[2];
 587                 side = front < node->plane->dist;
 588                 if ((back < node->plane->dist) == side)
 589                 {
 590                         node = node->children[side];
 591                         goto loc0;
 592                 }
 593                 // found an intersection
 594 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / ((front - node->plane->dist) - (back - node->plane->dist)));
 595 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / (front - back));
 596                 mid = startz + distz * (front - node->plane->dist) / (front - back);
 597                 break;
 598         }
 599
 600         // go down front side
 601         if (node->children[side]->contents >= 0 && RecursiveLightPoint (color, node->children[side], x, y, startz, mid))
 602                 return true;    // hit something
 603         else
 604         {
 605                 // check for impact on this node
 606                 if (node->numsurfaces)
 607                 {
 608                         int i, ds, dt;
 609                         msurface_t *surf;
 610                         lightspot[0] = x;
 611                         lightspot[1] = y;
 612                         lightspot[2] = mid;
 613                         lightplane = node->plane;
 614
 615                         surf = cl.worldmodel->surfaces + node->firstsurface;
 616                         for (i = 0;i < node->numsurfaces;i++, surf++)
 617                         {
 618                                 if (surf->flags & SURF_DRAWTILED)
 619                                         continue;       // no lightmaps
 620
 621                                 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]);
 622                                 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]);
 623
 624                                 if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 625                                         continue;
 626
 627                                 ds -= surf->texturemins[0];
 628                                 dt -= surf->texturemins[1];
 629
 630                                 if (ds > surf->extents[0] || dt > surf->extents[1])
 631                                         continue;
 632
 633                                 if (surf->samples)
 634                                 {
 635                                         byte *lightmap;
 636                                         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;
 637                                         line3 = ((surf->extents[0]>>4)+1)*3;
 638                                         size3 = ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 639
 640                                         lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 641
 642                                         for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 643                                         {
 644                                                 scale = d_lightstylevalue[surf->styles[maps]];
 645                                                 r00 += lightmap[      0] * scale;g00 += lightmap[      1] * scale;b00 += lightmap[      2] * scale;
 646                                                 r01 += lightmap[      3] * scale;g01 += lightmap[      4] * scale;b01 += lightmap[      5] * scale;
 647                                                 r10 += lightmap[line3+0] * scale;g10 += lightmap[line3+1] * scale;b10 += lightmap[line3+2] * scale;
 648                                                 r11 += lightmap[line3+3] * scale;g11 += lightmap[line3+4] * scale;b11 += lightmap[line3+5] * scale;
 649                                                 lightmap += size3;
 650                                         }
 651
 652                                         color[0] += (float) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)) * (1.0f / 256.0f);
 653                                         color[1] += (float) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)) * (1.0f / 256.0f);
 654                                         color[2] += (float) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)) * (1.0f / 256.0f);
 655                                 }
 656                                 return true; // success
 657                         }
 658                 }
 659
 660                 // go down back side
 661                 node = node->children[side ^ 1];
 662                 startz = mid;
 663                 distz = endz - startz;
 664                 goto loc0;
 665 //              return RecursiveLightPoint (color, node->children[side ^ 1], x, y, mid, endz);
 666         }
 667 }
 668
 669 void R_LightPoint (vec3_t color, vec3_t p)
 670 {
 671         if (r_fullbright.value || !cl.worldmodel->lightdata)
 672         {
 673                 color[0] = color[1] = color[2] = 255;
 674                 return;
 675         }
 676
 677         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 678         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 679 }
 680
 681 // LordHavoc: R_DynamicLightPoint - acumulates the dynamic lighting
 682 void R_DynamicLightPoint(vec3_t color, vec3_t org, int *dlightbits)
 683 {
 684         int             i, j, k;
 685         vec3_t  dist;
 686         float   brightness, r, f;
 687
 688         if (!r_dynamic.value || (!dlightbits[0] && !dlightbits[1] && !dlightbits[2] && !dlightbits[3] && !dlightbits[4] && !dlightbits[5] && !dlightbits[6] && !dlightbits[7]))
 689                 return;
 690
 691         for (j = 0;j < (MAX_DLIGHTS >> 5);j++)
 692         {
 693                 if (dlightbits[j])
 694                 {
 695                         for (i=0 ; i<32 ; i++)
 696                         {
 697                                 if ((!((1 << (i&31)) & dlightbits[i>>5])) || cl_dlights[i].die < cl.time || !cl_dlights[i].radius)
 698                                         continue;
 699                                 k = (j<<5)+i;
 700                                 VectorSubtract (org, cl_dlights[k].origin, dist);
 701                                 f = DotProduct(dist, dist) + LIGHTOFFSET;
 702                                 r = cl_dlights[k].radius*cl_dlights[k].radius*LIGHTSCALE;
 703                                 if (f < r)
 704                                 {
 705                                         brightness = r * (256.0f / LIGHTSCALE2) / f;
 706                                         color[0] += brightness * cl_dlights[k].color[0];
 707                                         color[1] += brightness * cl_dlights[k].color[1];
 708                                         color[2] += brightness * cl_dlights[k].color[2];
 709                                 }
 710                         }
 711                 }
 712         }
 713 }
 714
 715 // same as above but no bitmask to check
 716 void R_DynamicLightPointNoMask(vec3_t color, vec3_t org)
 717 {
 718         int             i;
 719         vec3_t  dist;
 720         float   brightness, r, f;
 721
 722         if (!r_dynamic.value)
 723                 return;
 724
 725         for (i=0 ; i<MAX_DLIGHTS ; i++)
 726         {
 727                 if (cl_dlights[i].die < cl.time || !cl_dlights[i].radius)
 728                         continue;
 729                 VectorSubtract (org, cl_dlights[i].origin, dist);
 730                 f = DotProduct(dist, dist) + LIGHTOFFSET;
 731                 r = cl_dlights[i].radius*cl_dlights[i].radius*LIGHTSCALE;
 732                 if (f < r)
 733                 {
 734                         brightness = r * (256.0f / LIGHTSCALE2) / f;
 735                         if (cl_dlights[i].dark)
 736                                 brightness = -brightness;
 737                         color[0] += brightness * cl_dlights[i].color[0];
 738                         color[1] += brightness * cl_dlights[i].color[1];
 739                         color[2] += brightness * cl_dlights[i].color[2];
 740                 }
 741         }
 742 }
 743
 744 void R_CompleteLightPoint (vec3_t color, vec3_t p)
 745 {
 746         R_LightPoint(color, p);
 747         R_DynamicLightPointNoMask(color, p);
 748 }
 749
 750 extern float *aliasvert;
 751 extern float *modelaliasvert;
 752 extern float *aliasvertnorm;
 753 extern byte *aliasvertcolor;
 754 extern float modelalpha;
 755 extern int modeldlightbits[8];
 756 void R_LightModel(int numverts, vec3_t center, vec3_t basecolor)
 757 {
 758         // LordHavoc: warning: reliance on int being 4 bytes here (of course the d_8to24table relies on that too...)
 759         int i, j, nearlights = 0, color;
 760         vec3_t dist, mod;
 761         float t, t1, t2, t3, *avn;
 762         byte r,g,b,a, *avc;
 763         struct
 764         {
 765                 vec3_t color;
 766                 vec3_t origin;
 767         } nearlight[MAX_DLIGHTS];
 768         avc = aliasvertcolor;
 769         avn = aliasvertnorm;
 770         a = (byte) bound((int) 0, (int) (modelalpha * 255.0f), (int) 255);
 771         if (currententity->effects & EF_FULLBRIGHT)
 772         {
 773                 if (lighthalf)
 774                 {
 775                         ((byte *)&color)[0] = (byte) ((float) (128.0f * currententity->colormod[0]));
 776                         ((byte *)&color)[1] = (byte) ((float) (128.0f * currententity->colormod[1]));
 777                         ((byte *)&color)[2] = (byte) ((float) (128.0f * currententity->colormod[2]));
 778                 }
 779                 else
 780                 {
 781                         ((byte *)&color)[0] = (byte) ((float) (255.0f * currententity->colormod[0]));
 782                         ((byte *)&color)[1] = (byte) ((float) (255.0f * currententity->colormod[1]));
 783                         ((byte *)&color)[2] = (byte) ((float) (255.0f * currententity->colormod[2]));
 784                 }
 785                 ((byte *)&color)[3] = a;
 786                 for (i = 0;i < numverts;i++)
 787                 {
 788                         *((int *)avc) = color;
 789                         avc += 4;
 790                 }
 791                 return;
 792         }
 793         if (lighthalf)
 794         {
 795                 mod[0] = currententity->colormod[0] * 0.5f;
 796                 mod[1] = currententity->colormod[1] * 0.5f;
 797                 mod[2] = currententity->colormod[2] * 0.5f;
 798         }
 799         else
 800         {
 801                 mod[0] = currententity->colormod[0];
 802                 mod[1] = currententity->colormod[1];
 803                 mod[2] = currententity->colormod[2];
 804         }
 805         basecolor[0] *= mod[0];
 806         basecolor[1] *= mod[1];
 807         basecolor[2] *= mod[2];
 808         if (!r_lightmodels.value)
 809         {
 810                 for (i = 0;i < MAX_DLIGHTS;i++)
 811                 {
 812                         if (!modeldlightbits[i >> 5])
 813                         {
 814                                 i |= 31;
 815                                 continue;
 816                         }
 817                         if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
 818                                 continue;
 819                         VectorSubtract (center, cl_dlights[i].origin, dist);
 820                         t1 = cl_dlights[i].radius*cl_dlights[i].radius*LIGHTSCALE;
 821                         t2 = DotProduct(dist,dist) * (1.0f / LIGHTSCALE) + LIGHTOFFSET;
 822                         if (t2 < t1)
 823                         {
 824                                 dist[0] = cl_dlights[i].color[0] * t1 * mod[0];
 825                                 dist[1] = cl_dlights[i].color[1] * t1 * mod[1];
 826                                 dist[2] = cl_dlights[i].color[2] * t1 * mod[2];
 827                                 t1 = (224.0f / LIGHTSCALE / LIGHTSCALE) / t2;
 828                                 basecolor[0] += dist[0] * t1;
 829                                 basecolor[1] += dist[1] * t1;
 830                                 basecolor[2] += dist[2] * t1;
 831                         }
 832                 }
 833                 ((byte *)&color)[0] = bound(0, basecolor[0], 255);
 834                 ((byte *)&color)[1] = bound(0, basecolor[1], 255);
 835                 ((byte *)&color)[2] = bound(0, basecolor[2], 255);
 836                 ((byte *)&color)[3] = a;
 837                 for (i = 0;i < numverts;i++)
 838                 {
 839                         *((int *)avc) = color;
 840                         avc += 4;
 841                 }
 842                 return;
 843         }
 844         else
 845         {
 846                 for (i = 0;i < MAX_DLIGHTS;i++)
 847                 {
 848                         if (!modeldlightbits[i >> 5])
 849                         {
 850                                 i |= 31;
 851                                 continue;
 852                         }
 853                         if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
 854                                 continue;
 855                         VectorSubtract (center, cl_dlights[i].origin, dist);
 856                         t1 = cl_dlights[i].radius*cl_dlights[i].radius*LIGHTSCALE;
 857                         t2 = DotProduct(dist,dist) * (1.0f / LIGHTSCALE) + LIGHTOFFSET;
 858                         if (t2 < t1)
 859                         {
 860                                 if (r_modelsdonttransformnormals.value)
 861                                         softwareuntransform(cl_dlights[i].origin, nearlight[nearlights].origin);
 862                                 else
 863                                 {
 864                                         VectorCopy(cl_dlights[i].origin, nearlight[nearlights].origin);
 865                                 }
 866                                 nearlight[nearlights].color[0] = cl_dlights[i].color[0] * t1 * mod[0];
 867                                 nearlight[nearlights].color[1] = cl_dlights[i].color[1] * t1 * mod[1];
 868                                 nearlight[nearlights].color[2] = cl_dlights[i].color[2] * t1 * mod[2];
 869 //                              t1 = (128.0f / LIGHTSCALE2) / t2;
 870 //                              basecolor[0] += nearlight[nearlights].color[0] * t1;
 871 //                              basecolor[1] += nearlight[nearlights].color[1] * t1;
 872 //                              basecolor[2] += nearlight[nearlights].color[2] * t1;
 873                                 nearlights++;
 874                         }
 875                 }
 876         }
 877         t1 = bound(0, basecolor[0], 255);r = (byte) t1;
 878         t1 = bound(0, basecolor[1], 255);g = (byte) t1;
 879         t1 = bound(0, basecolor[2], 255);b = (byte) t1;
 880         ((byte *)&color)[0] = r;
 881         ((byte *)&color)[1] = g;
 882         ((byte *)&color)[2] = b;
 883         ((byte *)&color)[3] = a;
 884         if (nearlights)
 885         {
 886                 int temp;
 887                 vec3_t v;
 888                 float *av;
 889                 if (r_modelsdonttransformnormals.value)
 890                         av = modelaliasvert;
 891                 else
 892                         av = aliasvert;
 893                 if (nearlights == 1)
 894                 {
 895                         for (i = 0;i < numverts;i++)
 896                         {
 897                                 VectorSubtract(nearlight[0].origin, av, v);
 898                                 t = DotProduct(avn,v);
 899                                 if (t > 0)
 900                                 {
 901                                         t /= DotProduct(v,v);
 902                                         temp = (int) ((float) (basecolor[0] + nearlight[0].color[0] * t));if (temp < 0) temp = 0;else if (temp > 255) temp = 255;avc[0] = temp;
 903                                         temp = (int) ((float) (basecolor[1] + nearlight[0].color[1] * t));if (temp < 0) temp = 0;else if (temp > 255) temp = 255;avc[1] = temp;
 904                                         temp = (int) ((float) (basecolor[2] + nearlight[0].color[2] * t));if (temp < 0) temp = 0;else if (temp > 255) temp = 255;avc[2] = temp;
 905                                         avc[3] = a;
 906                                 }
 907                                 else
 908                                         *((int *)avc) = color;
 909                                 avc += 4;
 910                                 av += 3;
 911                                 avn += 3;
 912                         }
 913                 }
 914                 else
 915                 {
 916                         int i1, i2, i3, k;
 917                         for (i = 0;i < numverts;i++)
 918                         {
 919                                 t1 = basecolor[0];
 920                                 t2 = basecolor[1];
 921                                 t3 = basecolor[2];
 922                                 k = false;
 923                                 for (j = 0;j < nearlights;j++)
 924                                 {
 925                                         VectorSubtract(nearlight[j].origin, av, v);
 926                                         t = DotProduct(avn,v);
 927                                         if (t > 0)
 928                                         {
 929                                                 t /= DotProduct(v,v);
 930                                                 t1 += nearlight[j].color[0] * t;
 931                                                 t2 += nearlight[j].color[1] * t;
 932                                                 t3 += nearlight[j].color[2] * t;
 933                                                 k = true;
 934                                         }
 935                                 }
 936                                 if (k)
 937                                 {
 938                                         i1 = t1;if (i1 < 0) i1 = 0;else if (i1 > 255) i1 = 255;avc[0] = i1;
 939                                         i2 = t2;if (i2 < 0) i2 = 0;else if (i2 > 255) i2 = 255;avc[1] = i2;
 940                                         i3 = t3;if (i3 < 0) i3 = 0;else if (i3 > 255) i3 = 255;avc[2] = i3;
 941                                         avc[3] = a;
 942                                 }
 943                                 else // dodge the costly float -> int conversions
 944                                         *((int *)avc) = color;
 945                                 avc += 4;
 946                                 av += 3;
 947                                 avn += 3;
 948                         }
 949                 }
 950         }
 951         else
 952         {
 953                 for (i = 0;i < numverts;i++)
 954                 {
 955                         *((int *)avc) = color;
 956                         avc += 4;
 957                 }
 958         }
 959 }