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 rdlight_t r_dlight[MAX_DLIGHTS];
  25 int r_numdlights = 0;
  26
  27 cvar_t r_lightmodels = {CVAR_SAVE, "r_lightmodels", "1"};
  28 cvar_t r_vismarklights = {0, "r_vismarklights", "1"};
  29 cvar_t r_lightmodelhardness = {CVAR_SAVE, "r_lightmodelhardness", "0.9"};
  30
  31 static rtexture_t *lightcorona;
  32 static rtexturepool_t *lighttexturepool;
  33
  34 void r_light_start(void)
  35 {
  36         float dx, dy;
  37         int x, y, a;
  38         byte pixels[32][32][4];
  39         lighttexturepool = R_AllocTexturePool();
  40         for (y = 0;y < 32;y++)
  41         {
  42                 dy = (y - 15.5f) * (1.0f / 16.0f);
  43                 for (x = 0;x < 32;x++)
  44                 {
  45                         dx = (x - 15.5f) * (1.0f / 16.0f);
  46                         a = ((1.0f / (dx * dx + dy * dy + 0.2f)) - (1.0f / (1.0f + 0.2))) * 8.0f / (1.0f / (1.0f + 0.2));
  47                         a = bound(0, a, 255);
  48                         pixels[y][x][0] = 255;
  49                         pixels[y][x][1] = 255;
  50                         pixels[y][x][2] = 255;
  51                         pixels[y][x][3] = a;
  52                 }
  53         }
  54         lightcorona = R_LoadTexture (lighttexturepool, "lightcorona", 32, 32, &pixels[0][0][0], TEXTYPE_RGBA, TEXF_PRECACHE | TEXF_ALPHA);
  55 }
  56
  57 void r_light_shutdown(void)
  58 {
  59         lighttexturepool = NULL;
  60         lightcorona = NULL;
  61 }
  62
  63 void r_light_newmap(void)
  64 {
  65 }
  66
  67 void R_Light_Init(void)
  68 {
  69         Cvar_RegisterVariable(&r_lightmodels);
  70         Cvar_RegisterVariable(&r_lightmodelhardness);
  71         Cvar_RegisterVariable(&r_vismarklights);
  72         R_RegisterModule("R_Light", r_light_start, r_light_shutdown, r_light_newmap);
  73 }
  74
  75 /*
  76 ==================
  77 R_AnimateLight
  78 ==================
  79 */
  80 void R_AnimateLight (void)
  81 {
  82         int i, j, k;
  83
  84 //
  85 // light animations
  86 // 'm' is normal light, 'a' is no light, 'z' is double bright
  87         i = (int)(cl.time * 10);
  88         for (j = 0;j < MAX_LIGHTSTYLES;j++)
  89         {
  90                 if (!cl_lightstyle[j].length)
  91                 {
  92                         d_lightstylevalue[j] = 256;
  93                         continue;
  94                 }
  95                 k = i % cl_lightstyle[j].length;
  96                 k = cl_lightstyle[j].map[k] - 'a';
  97                 k = k*22;
  98                 d_lightstylevalue[j] = k;
  99         }
 100 }
 101
 102
 103 void R_BuildLightList(void)
 104 {
 105         int                     i;
 106         dlight_t        *cd;
 107         rdlight_t       *rd;
 108
 109         r_numdlights = 0;
 110         c_dlights = 0;
 111
 112         if (!r_dynamic.integer)
 113                 return;
 114
 115         for (i = 0;i < MAX_DLIGHTS;i++)
 116         {
 117                 cd = cl_dlights + i;
 118                 if (cd->radius <= 0)
 119                         continue;
 120                 rd = &r_dlight[r_numdlights++];
 121                 VectorCopy(cd->origin, rd->origin);
 122                 VectorScale(cd->color, cd->radius * 128.0f, rd->light);
 123                 rd->cullradius = (1.0f / 128.0f) * sqrt(DotProduct(rd->light, rd->light));
 124                 // clamp radius to avoid overflowing division table in lightmap code
 125                 if (rd->cullradius > 2048.0f)
 126                         rd->cullradius = 2048.0f;
 127                 rd->cullradius2 = rd->cullradius * rd->cullradius;
 128                 rd->lightsubtract = 1.0f / rd->cullradius2;
 129                 rd->ent = cd->ent;
 130                 r_numdlights++;
 131                 c_dlights++; // count every dlight in use
 132         }
 133 }
 134
 135 static int coronapolyindex[6] = {0, 1, 2, 0, 2, 3};
 136
 137 void R_DrawCoronas(void)
 138 {
 139         int i;
 140         rmeshinfo_t m;
 141         float tvxyz[4][4], tvst[4][2], scale, viewdist, diff[3], dist;
 142         rdlight_t *rd;
 143         memset(&m, 0, sizeof(m));
 144         m.transparent = false;
 145         m.blendfunc1 = GL_SRC_ALPHA;
 146         m.blendfunc2 = GL_ONE;
 147         m.depthdisable = true; // magic
 148         m.numtriangles = 2;
 149         m.numverts = 4;
 150         m.index = coronapolyindex;
 151         m.vertex = &tvxyz[0][0];
 152         m.vertexstep = sizeof(float[4]);
 153         m.tex[0] = R_GetTexture(lightcorona);
 154         m.texcoords[0] = &tvst[0][0];
 155         m.texcoordstep[0] = sizeof(float[2]);
 156         tvst[0][0] = 0;
 157         tvst[0][1] = 0;
 158         tvst[1][0] = 0;
 159         tvst[1][1] = 1;
 160         tvst[2][0] = 1;
 161         tvst[2][1] = 1;
 162         tvst[3][0] = 1;
 163         tvst[3][1] = 0;
 164         viewdist = DotProduct(r_origin, vpn);
 165         for (i = 0;i < r_numdlights;i++)
 166         {
 167                 rd = r_dlight + i;
 168                 dist = (DotProduct(rd->origin, vpn) - viewdist);
 169                 if (dist >= 24.0f)
 170                 {
 171                         // trace to a point just barely closer to the eye
 172                         VectorSubtract(rd->origin, vpn, diff);
 173                         if (TraceLine(r_origin, diff, NULL, NULL, 0, true) == 1)
 174                         {
 175                                 scale = 1.0f / 4096.0f;
 176                                 m.cr = rd->light[0] * scale;
 177                                 m.cg = rd->light[1] * scale;
 178                                 m.cb = rd->light[2] * scale;
 179                                 m.ca = 1;
 180                                 if (fogenabled)
 181                                 {
 182                                         VectorSubtract(rd->origin, r_origin, diff);
 183                                         m.ca *= 1 - exp(fogdensity/DotProduct(diff,diff));
 184                                 }
 185                                 scale = rd->cullradius * 0.25f;
 186                                 tvxyz[0][0] = rd->origin[0] - vright[0] * scale - vup[0] * scale;
 187                                 tvxyz[0][1] = rd->origin[1] - vright[1] * scale - vup[1] * scale;
 188                                 tvxyz[0][2] = rd->origin[2] - vright[2] * scale - vup[2] * scale;
 189                                 tvxyz[1][0] = rd->origin[0] - vright[0] * scale + vup[0] * scale;
 190                                 tvxyz[1][1] = rd->origin[1] - vright[1] * scale + vup[1] * scale;
 191                                 tvxyz[1][2] = rd->origin[2] - vright[2] * scale + vup[2] * scale;
 192                                 tvxyz[2][0] = rd->origin[0] + vright[0] * scale + vup[0] * scale;
 193                                 tvxyz[2][1] = rd->origin[1] + vright[1] * scale + vup[1] * scale;
 194                                 tvxyz[2][2] = rd->origin[2] + vright[2] * scale + vup[2] * scale;
 195                                 tvxyz[3][0] = rd->origin[0] + vright[0] * scale - vup[0] * scale;
 196                                 tvxyz[3][1] = rd->origin[1] + vright[1] * scale - vup[1] * scale;
 197                                 tvxyz[3][2] = rd->origin[2] + vright[2] * scale - vup[2] * scale;
 198                                 R_Mesh_DrawDecal(&m);
 199                         }
 200                 }
 201         }
 202 }
 203
 204 /*
 205 =============================================================================
 206
 207 DYNAMIC LIGHTS
 208
 209 =============================================================================
 210 */
 211
 212 /*
 213 =============
 214 R_MarkLights
 215 =============
 216 */
 217 static void R_OldMarkLights (vec3_t lightorigin, rdlight_t *rd, int bit, int bitindex, mnode_t *node)
 218 {
 219         float           ndist, maxdist;
 220         msurface_t      *surf;
 221         mleaf_t         *leaf;
 222         int                     i;
 223
 224         if (!r_dynamic.integer)
 225                 return;
 226
 227         // for comparisons to minimum acceptable light
 228         maxdist = rd->cullradius2;
 229
 230 loc0:
 231         if (node->contents < 0)
 232         {
 233                 if (node->contents != CONTENTS_SOLID)
 234                 {
 235                         leaf = (mleaf_t *)node;
 236                         if (leaf->dlightframe != r_framecount) // not dynamic until now
 237                         {
 238                                 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;
 239                                 leaf->dlightframe = r_framecount;
 240                         }
 241                         leaf->dlightbits[bitindex] |= bit;
 242                 }
 243                 return;
 244         }
 245
 246         ndist = PlaneDiff(lightorigin, node->plane);
 247
 248         if (ndist > rd->cullradius)
 249         {
 250                 node = node->children[0];
 251                 goto loc0;
 252         }
 253         if (ndist < -rd->cullradius)
 254         {
 255                 node = node->children[1];
 256                 goto loc0;
 257         }
 258
 259 // mark the polygons
 260         surf = currentrenderentity->model->surfaces + node->firstsurface;
 261         for (i=0 ; i<node->numsurfaces ; i++, surf++)
 262         {
 263                 int d, impacts, impactt;
 264                 float dist, dist2, impact[3];
 265                 if (surf->visframe != r_framecount)
 266                         continue;
 267                 dist = ndist;
 268                 if (surf->flags & SURF_PLANEBACK)
 269                         dist = -dist;
 270
 271                 if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 272                         continue;
 273
 274                 dist2 = dist * dist;
 275                 if (dist2 >= maxdist)
 276                         continue;
 277
 278                 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
 279                 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
 280                 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
 281
 282                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 283
 284                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 285                 dist2 += d * d;
 286                 if (dist2 > maxdist)
 287                         continue;
 288
 289                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 290
 291                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 292                 dist2 += d * d;
 293                 if (dist2 > maxdist)
 294                         continue;
 295
 296
 297                 /*
 298                 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 299
 300                 if (d < 0)
 301                 {
 302                         dist2 += d * d;
 303                         if (dist2 >= maxdist)
 304                                 continue;
 305                 }
 306                 else
 307                 {
 308                         d -= surf->extents[0] + 16;
 309                         if (d > 0)
 310                         {
 311                                 dist2 += d * d;
 312                                 if (dist2 >= maxdist)
 313                                         continue;
 314                         }
 315                 }
 316
 317                 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 318
 319                 if (d < 0)
 320                 {
 321                         dist2 += d * d;
 322                         if (dist2 >= maxdist)
 323                                 continue;
 324                 }
 325                 else
 326                 {
 327                         d -= surf->extents[1] + 16;
 328                         if (d > 0)
 329                         {
 330                                 dist2 += d * d;
 331                                 if (dist2 >= maxdist)
 332                                         continue;
 333                         }
 334                 }
 335                 */
 336
 337                 if (surf->dlightframe != r_framecount) // not dynamic until now
 338                 {
 339                         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;
 340                         surf->dlightframe = r_framecount;
 341                 }
 342                 surf->dlightbits[bitindex] |= bit;
 343
 344                 /*
 345                 if (((surf->flags & SURF_PLANEBACK) == 0) == ((PlaneDist(lightorigin, surf->plane)) >= surf->plane->dist))
 346                 {
 347                         if (surf->dlightframe != r_framecount) // not dynamic until now
 348                         {
 349                                 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;
 350                                 surf->dlightframe = r_framecount;
 351                         }
 352                         surf->dlightbits[bitindex] |= bit;
 353                 }
 354                 */
 355         }
 356
 357         if (node->children[0]->contents >= 0)
 358         {
 359                 if (node->children[1]->contents >= 0)
 360                 {
 361                         R_OldMarkLights (lightorigin, rd, bit, bitindex, node->children[0]);
 362                         node = node->children[1];
 363                         goto loc0;
 364                 }
 365                 else
 366                 {
 367                         node = node->children[0];
 368                         goto loc0;
 369                 }
 370         }
 371         else if (node->children[1]->contents >= 0)
 372         {
 373                 node = node->children[1];
 374                 goto loc0;
 375         }
 376 }
 377
 378 /*
 379 static void R_NoVisMarkLights (rdlight_t *rd, int bit, int bitindex)
 380 {
 381         vec3_t lightorigin;
 382         softwareuntransform(rd->origin, lightorigin);
 383
 384         R_OldMarkLights(lightorigin, rd, bit, bitindex, currentrenderentity->model->nodes + currentrenderentity->model->hulls[0].firstclipnode);
 385 }
 386 */
 387
 388 static void R_VisMarkLights (rdlight_t *rd, int bit, int bitindex)
 389 {
 390         static int lightframe = 0;
 391         mleaf_t *pvsleaf;
 392         vec3_t lightorigin;
 393         model_t *model;
 394         int             i, k, m, c, leafnum;
 395         msurface_t *surf, **mark;
 396         mleaf_t *leaf;
 397         byte    *in;
 398         int             row;
 399         float   low[3], high[3], dist, maxdist;
 400
 401         if (!r_dynamic.integer)
 402                 return;
 403
 404         model = currentrenderentity->model;
 405         softwareuntransform(rd->origin, lightorigin);
 406
 407         if (!r_vismarklights.integer)
 408         {
 409                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 410                 return;
 411         }
 412
 413         pvsleaf = Mod_PointInLeaf (lightorigin, model);
 414         if (pvsleaf == NULL)
 415         {
 416                 Con_Printf("R_VisMarkLights: NULL leaf??\n");
 417                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 418                 return;
 419         }
 420
 421         in = pvsleaf->compressed_vis;
 422         if (!in)
 423         {
 424                 // no vis info, so make all visible
 425                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 426                 return;
 427         }
 428
 429         lightframe++;
 430
 431         low[0] = lightorigin[0] - rd->cullradius;low[1] = lightorigin[1] - rd->cullradius;low[2] = lightorigin[2] - rd->cullradius;
 432         high[0] = lightorigin[0] + rd->cullradius;high[1] = lightorigin[1] + rd->cullradius;high[2] = lightorigin[2] + rd->cullradius;
 433
 434         // for comparisons to minimum acceptable light
 435         maxdist = rd->cullradius2;
 436
 437         row = (model->numleafs+7)>>3;
 438
 439         k = 0;
 440         while (k < row)
 441         {
 442                 c = *in++;
 443                 if (c)
 444                 {
 445                         for (i = 0;i < 8;i++)
 446                         {
 447                                 if (c & (1<<i))
 448                                 {
 449                                         // warning to the clumsy: numleafs is one less than it should be, it only counts leafs with vis bits (skips leaf 0)
 450                                         leafnum = (k << 3)+i+1;
 451                                         if (leafnum > model->numleafs)
 452                                                 return;
 453                                         leaf = &model->leafs[leafnum];
 454                                         if (leaf->visframe != r_framecount
 455                                          || leaf->contents == CONTENTS_SOLID
 456                                          || leaf->mins[0] > high[0] || leaf->maxs[0] < low[0]
 457                                          || leaf->mins[1] > high[1] || leaf->maxs[1] < low[1]
 458                                          || leaf->mins[2] > high[2] || leaf->maxs[2] < low[2])
 459                                                 continue;
 460                                         if (leaf->dlightframe != r_framecount)
 461                                         {
 462                                                 // not dynamic until now
 463                                                 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;
 464                                                 leaf->dlightframe = r_framecount;
 465                                         }
 466                                         leaf->dlightbits[bitindex] |= bit;
 467                                         if ((m = leaf->nummarksurfaces))
 468                                         {
 469                                                 mark = leaf->firstmarksurface;
 470                                                 do
 471                                                 {
 472                                                         surf = *mark++;
 473                                                         // if not visible in current frame, or already marked because it was in another leaf we passed, skip
 474                                                         if (surf->lightframe == lightframe)
 475                                                                 continue;
 476                                                         surf->lightframe = lightframe;
 477                                                         if (surf->visframe != r_framecount)
 478                                                                 continue;
 479                                                         dist = PlaneDiff(lightorigin, surf->plane);
 480                                                         if (surf->flags & SURF_PLANEBACK)
 481                                                                 dist = -dist;
 482                                                         // LordHavoc: make sure it is infront of the surface and not too far away
 483                                                         if (dist < rd->cullradius && (dist > -0.25f || ((surf->flags & SURF_LIGHTBOTHSIDES) && dist > -rd->cullradius)))
 484                                                         {
 485                                                                 int d;
 486                                                                 int impacts, impactt;
 487                                                                 float dist2, impact[3];
 488
 489                                                                 dist2 = dist * dist;
 490
 491                                                                 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
 492                                                                 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
 493                                                                 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
 494
 495 #if 0
 496                                                                 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 497                                                                 if (d < 0)
 498                                                                 {
 499                                                                         dist2 += d * d;
 500                                                                         if (dist2 > maxdist)
 501                                                                                 continue;
 502                                                                 }
 503                                                                 else
 504                                                                 {
 505                                                                         d -= surf->extents[0];
 506                                                                         if (d < 0)
 507                                                                         {
 508                                                                                 dist2 += d * d;
 509                                                                                 if (dist2 > maxdist)
 510                                                                                         continue;
 511                                                                         }
 512                                                                 }
 513
 514                                                                 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 515                                                                 if (d < 0)
 516                                                                 {
 517                                                                         dist2 += d * d;
 518                                                                         if (dist2 > maxdist)
 519                                                                                 continue;
 520                                                                 }
 521                                                                 else
 522                                                                 {
 523                                                                         d -= surf->extents[1];
 524                                                                         if (d < 0)
 525                                                                         {
 526                                                                                 dist2 += d * d;
 527                                                                                 if (dist2 > maxdist)
 528                                                                                         continue;
 529                                                                         }
 530                                                                 }
 531
 532 #else
 533
 534                                                                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 535                                                                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 536                                                                 dist2 += d * d;
 537                                                                 if (dist2 > maxdist)
 538                                                                         continue;
 539
 540                                                                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 541                                                                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 542                                                                 dist2 += d * d;
 543                                                                 if (dist2 > maxdist)
 544                                                                         continue;
 545
 546 #endif
 547
 548                                                                 if (surf->dlightframe != r_framecount) // not dynamic until now
 549                                                                 {
 550                                                                         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;
 551                                                                         surf->dlightframe = r_framecount;
 552                                                                 }
 553                                                                 surf->dlightbits[bitindex] |= bit;
 554                                                         }
 555                                                 }
 556                                                 while (--m);
 557                                         }
 558                                 }
 559                         }
 560                         k++;
 561                         continue;
 562                 }
 563
 564                 k += *in++;
 565         }
 566 }
 567
 568 void R_MarkLights(void)
 569 {
 570         int i;
 571         for (i = 0;i < r_numdlights;i++)
 572                 R_VisMarkLights (r_dlight + i, 1 << (i & 31), i >> 5);
 573 }
 574
 575 /*
 576 =============================================================================
 577
 578 LIGHT SAMPLING
 579
 580 =============================================================================
 581 */
 582
 583 static int RecursiveLightPoint (vec3_t color, mnode_t *node, float x, float y, float startz, float endz)
 584 {
 585         int             side, distz = endz - startz;
 586         float   front, back;
 587         float   mid;
 588
 589 loc0:
 590         if (node->contents < 0)
 591                 return false;           // didn't hit anything
 592
 593         switch (node->plane->type)
 594         {
 595         case PLANE_X:
 596                 node = node->children[x < node->plane->dist];
 597                 goto loc0;
 598         case PLANE_Y:
 599                 node = node->children[y < node->plane->dist];
 600                 goto loc0;
 601         case PLANE_Z:
 602                 side = startz < node->plane->dist;
 603                 if ((endz < node->plane->dist) == side)
 604                 {
 605                         node = node->children[side];
 606                         goto loc0;
 607                 }
 608                 // found an intersection
 609 //              mid = startz + (endz - startz) * (startz - node->plane->dist) / (startz - endz);
 610 //              mid = startz + distz * (startz - node->plane->dist) / (-distz);
 611 //              mid = startz + (-(startz - node->plane->dist));
 612 //              mid = startz - (startz - node->plane->dist);
 613 //              mid = startz + node->plane->dist - startz;
 614                 mid = node->plane->dist;
 615                 break;
 616         default:
 617                 back = front = x * node->plane->normal[0] + y * node->plane->normal[1];
 618                 front += startz * node->plane->normal[2];
 619                 back += endz * node->plane->normal[2];
 620                 side = front < node->plane->dist;
 621                 if ((back < node->plane->dist) == side)
 622                 {
 623                         node = node->children[side];
 624                         goto loc0;
 625                 }
 626                 // found an intersection
 627 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / ((front - node->plane->dist) - (back - node->plane->dist)));
 628 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / (front - back));
 629                 mid = startz + distz * (front - node->plane->dist) / (front - back);
 630                 break;
 631         }
 632
 633         // go down front side
 634         if (node->children[side]->contents >= 0 && RecursiveLightPoint (color, node->children[side], x, y, startz, mid))
 635                 return true;    // hit something
 636         else
 637         {
 638                 // check for impact on this node
 639                 if (node->numsurfaces)
 640                 {
 641                         int i, ds, dt;
 642                         msurface_t *surf;
 643
 644                         surf = cl.worldmodel->surfaces + node->firstsurface;
 645                         for (i = 0;i < node->numsurfaces;i++, surf++)
 646                         {
 647                                 if (!(surf->flags & SURF_LIGHTMAP))
 648                                         continue;       // no lightmaps
 649
 650                                 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]);
 651                                 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]);
 652
 653                                 if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 654                                         continue;
 655
 656                                 ds -= surf->texturemins[0];
 657                                 dt -= surf->texturemins[1];
 658
 659                                 if (ds > surf->extents[0] || dt > surf->extents[1])
 660                                         continue;
 661
 662                                 if (surf->samples)
 663                                 {
 664                                         byte *lightmap;
 665                                         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;
 666                                         line3 = ((surf->extents[0]>>4)+1)*3;
 667                                         size3 = ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 668
 669                                         lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 670
 671                                         for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 672                                         {
 673                                                 scale = d_lightstylevalue[surf->styles[maps]];
 674                                                 r00 += lightmap[      0] * scale;g00 += lightmap[      1] * scale;b00 += lightmap[      2] * scale;
 675                                                 r01 += lightmap[      3] * scale;g01 += lightmap[      4] * scale;b01 += lightmap[      5] * scale;
 676                                                 r10 += lightmap[line3+0] * scale;g10 += lightmap[line3+1] * scale;b10 += lightmap[line3+2] * scale;
 677                                                 r11 += lightmap[line3+3] * scale;g11 += lightmap[line3+4] * scale;b11 += lightmap[line3+5] * scale;
 678                                                 lightmap += size3;
 679                                         }
 680
 681                                         /*
 682                                         // LordHavoc: here's the readable version of the interpolation
 683                                         // code, not quite as easy for the compiler to optimize...
 684
 685                                         // dsfrac is the X position in the lightmap pixel, * 16
 686                                         // dtfrac is the Y position in the lightmap pixel, * 16
 687                                         // r00 is top left corner, r01 is top right corner
 688                                         // r10 is bottom left corner, r11 is bottom right corner
 689                                         // g and b are the same layout.
 690                                         // r0 and r1 are the top and bottom intermediate results
 691
 692                                         // first we interpolate the top two points, to get the top
 693                                         // edge sample
 694                                         r0 = (((r01-r00) * dsfrac) >> 4) + r00;
 695                                         g0 = (((g01-g00) * dsfrac) >> 4) + g00;
 696                                         b0 = (((b01-b00) * dsfrac) >> 4) + b00;
 697                                         // then we interpolate the bottom two points, to get the
 698                                         // bottom edge sample
 699                                         r1 = (((r11-r10) * dsfrac) >> 4) + r10;
 700                                         g1 = (((g11-g10) * dsfrac) >> 4) + g10;
 701                                         b1 = (((b11-b10) * dsfrac) >> 4) + b10;
 702                                         // then we interpolate the top and bottom samples to get the
 703                                         // middle sample (the one which was requested)
 704                                         r = (((r1-r0) * dtfrac) >> 4) + r0;
 705                                         g = (((g1-g0) * dtfrac) >> 4) + g0;
 706                                         b = (((b1-b0) * dtfrac) >> 4) + b0;
 707                                         */
 708
 709                                         color[0] += (float) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)) * (1.0f / 32768.0f);
 710                                         color[1] += (float) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)) * (1.0f / 32768.0f);
 711                                         color[2] += (float) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)) * (1.0f / 32768.0f);
 712                                 }
 713                                 return true; // success
 714                         }
 715                 }
 716
 717                 // go down back side
 718                 node = node->children[side ^ 1];
 719                 startz = mid;
 720                 distz = endz - startz;
 721                 goto loc0;
 722 //              return RecursiveLightPoint (color, node->children[side ^ 1], x, y, mid, endz);
 723         }
 724 }
 725
 726 void R_CompleteLightPoint (vec3_t color, vec3_t p, int dynamic, mleaf_t *leaf)
 727 {
 728         int      i, *dlightbits;
 729         vec3_t dist;
 730         float f;
 731         rdlight_t *rd;
 732         if (leaf == NULL)
 733                 leaf = Mod_PointInLeaf(p, cl.worldmodel);
 734
 735         if (leaf->contents == CONTENTS_SOLID)
 736         {
 737                 color[0] = color[1] = color[2] = 0;
 738                 return;
 739         }
 740
 741         if (r_fullbright.integer || !cl.worldmodel->lightdata)
 742         {
 743                 color[0] = color[1] = color[2] = 2;
 744                 return;
 745         }
 746
 747         color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
 748         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 749
 750         if (dynamic && leaf->dlightframe == r_framecount)
 751         {
 752                 dlightbits = leaf->dlightbits;
 753                 for (i = 0;i < r_numdlights;i++)
 754                 {
 755                         if (!(dlightbits[i >> 5] & (1 << (i & 31))))
 756                                 continue;
 757                         rd = r_dlight + i;
 758                         VectorSubtract (p, rd->origin, dist);
 759                         f = DotProduct(dist, dist) + LIGHTOFFSET;
 760                         if (f < rd->cullradius2)
 761                         {
 762                                 f = (1.0f / f) - rd->lightsubtract;
 763                                 if (f > 0)
 764                                         VectorMA(color, f, rd->light, color);
 765                         }
 766                 }
 767         }
 768 }
 769
 770 void R_ModelLightPoint (vec3_t color, vec3_t p, int *dlightbits)
 771 {
 772         mleaf_t *leaf;
 773         leaf = Mod_PointInLeaf(p, cl.worldmodel);
 774         if (leaf->contents == CONTENTS_SOLID)
 775         {
 776                 color[0] = color[1] = color[2] = 0;
 777                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 778                 return;
 779         }
 780
 781         if (r_fullbright.integer || !cl.worldmodel->lightdata)
 782         {
 783                 color[0] = color[1] = color[2] = 2;
 784                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 785                 return;
 786         }
 787
 788         color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
 789         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 790
 791         if (leaf->dlightframe == r_framecount)
 792         {
 793                 dlightbits[0] = leaf->dlightbits[0];
 794                 dlightbits[1] = leaf->dlightbits[1];
 795                 dlightbits[2] = leaf->dlightbits[2];
 796                 dlightbits[3] = leaf->dlightbits[3];
 797                 dlightbits[4] = leaf->dlightbits[4];
 798                 dlightbits[5] = leaf->dlightbits[5];
 799                 dlightbits[6] = leaf->dlightbits[6];
 800                 dlightbits[7] = leaf->dlightbits[7];
 801         }
 802         else
 803                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 804 }
 805
 806 void R_LightModel(int numverts)
 807 {
 808         int i, j, nearlights = 0;
 809         float color[3], basecolor[3], v[3], t, *av, *avn, *avc, a, number, f, hardness, hardnessoffset, dist2;
 810         struct
 811         {
 812                 vec3_t origin;
 813                 vec_t cullradius2;
 814                 vec3_t light;
 815                 vec_t lightsubtract;
 816         }
 817         nearlight[MAX_DLIGHTS], *nl;
 818         int modeldlightbits[8];
 819         //staticlight_t *sl;
 820         a = currentrenderentity->alpha;
 821         if (currentrenderentity->effects & EF_FULLBRIGHT)
 822                 basecolor[0] = basecolor[1] = basecolor[2] = 1;
 823         else
 824         {
 825                 if (r_lightmodels.integer)
 826                 {
 827                         R_ModelLightPoint(basecolor, currentrenderentity->origin, modeldlightbits);
 828
 829                         nl = &nearlight[0];
 830                         /*
 831                         // this code is unused for now
 832                         for (i = 0, sl = staticlight;i < staticlights && nearlights < MAX_DLIGHTS;i++, sl++)
 833                         {
 834                                 if (TraceLine(currentrenderentity->origin, sl->origin, NULL, NULL, 0) == 1)
 835                                 {
 836                                         nl->fadetype = sl->fadetype;
 837                                         nl->distancescale = sl->distancescale;
 838                                         nl->radius = sl->radius;
 839                                         VectorCopy(sl->origin, nl->origin);
 840                                         VectorCopy(sl->color, nl->light);
 841                                         nl->cullradius2 = 99999999;
 842                                         nl->lightsubtract = 0;
 843                                         nl++;
 844                                         nearlights++;
 845                                 }
 846                         }
 847                         */
 848                         for (i = 0;i < r_numdlights && nearlights < MAX_DLIGHTS;i++)
 849                         {
 850                                 if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
 851                                         continue;
 852                                 if (currentrenderentity == r_dlight[i].ent)
 853                                 {
 854                                         f = (1.0f / LIGHTOFFSET) - nl->lightsubtract;
 855                                         if (f > 0)
 856                                                 VectorMA(basecolor, f, r_dlight[i].light, basecolor);
 857                                 }
 858                                 else
 859                                 {
 860                                         // convert 0-255 radius coloring to 0-1, while also amplifying the brightness by 16
 861                                         //if (TraceLine(currentrenderentity->origin, r_dlight[i].origin, NULL, NULL, 0) == 1)
 862                                         {
 863                                                 // transform the light into the model's coordinate system
 864                                                 //if (gl_transform.integer)
 865                                                 //      softwareuntransform(r_dlight[i].origin, nl->origin);
 866                                                 //else
 867                                                         VectorCopy(r_dlight[i].origin, nl->origin);
 868                                                 nl->cullradius2 = r_dlight[i].cullradius2;
 869                                                 VectorCopy(r_dlight[i].light, nl->light);
 870                                                 nl->lightsubtract = r_dlight[i].lightsubtract;
 871                                                 nl++;
 872                                                 nearlights++;
 873                                         }
 874                                 }
 875                         }
 876                 }
 877                 else
 878                         R_CompleteLightPoint (basecolor, currentrenderentity->origin, true, NULL);
 879         }
 880         avc = aliasvertcolor;
 881         if (nearlights)
 882         {
 883                 av = aliasvert;
 884                 avn = aliasvertnorm;
 885                 hardness = r_lightmodelhardness.value;
 886                 hardnessoffset = (1.0f - hardness);
 887                 for (i = 0;i < numverts;i++)
 888                 {
 889                         VectorCopy(basecolor, color);
 890                         for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 891                         {
 892                                 // distance attenuation
 893                                 VectorSubtract(nl->origin, av, v);
 894                                 dist2 = DotProduct(v,v);
 895                                 if (dist2 < nl->cullradius2)
 896                                 {
 897                                         f = (1.0f / (dist2 + LIGHTOFFSET)) - nl->lightsubtract;
 898                                         if (f > 0)
 899                                         {
 900                                                 // directional shading
 901                                                 #if SLOWMATH
 902                                                 t = 1.0f / sqrt(dist2);
 903                                                 #else
 904                                                 number = DotProduct(v, v);
 905                                                 *((long *)&t) = 0x5f3759df - ((* (long *) &number) >> 1);
 906                                                 t = t * (1.5f - (number * 0.5f * t * t));
 907                                                 #endif
 908                                                 // DotProduct(avn,v) * t is dotproduct with a normalized v,
 909                                                 // the hardness variables are for backlighting/shinyness
 910                                                 f *= DotProduct(avn,v) * t * hardness + hardnessoffset;
 911                                                 if (f > 0)
 912                                                         VectorMA(color, f, nl->light, color);
 913                                         }
 914                                 }
 915                         }
 916
 917                         VectorCopy(color, avc);
 918                         avc[3] = a;
 919                         avc += 4;
 920                         av += 3;
 921                         avn += 3;
 922                 }
 923         }
 924         else
 925         {
 926                 for (i = 0;i < numverts;i++)
 927                 {
 928                         VectorCopy(basecolor, avc);
 929                         avc[3] = a;
 930                         avc += 4;
 931                 }
 932         }
 933 }