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))) * 64.0f / (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 / 262144.0f;
 176                                 //scale = 64.0f / (DotProduct(diff,diff) + 1024.0f);
 177                                 m.cr = rd->light[0] * scale;
 178                                 m.cg = rd->light[1] * scale;
 179                                 m.cb = rd->light[2] * scale;
 180                                 m.ca = 1;
 181                                 if (fogenabled)
 182                                 {
 183                                         VectorSubtract(rd->origin, r_origin, diff);
 184                                         m.ca *= 1 - exp(fogdensity/DotProduct(diff,diff));
 185                                 }
 186                                 scale = rd->cullradius * 0.25f;
 187                                 tvxyz[0][0] = rd->origin[0] - vright[0] * scale - vup[0] * scale;
 188                                 tvxyz[0][1] = rd->origin[1] - vright[1] * scale - vup[1] * scale;
 189                                 tvxyz[0][2] = rd->origin[2] - vright[2] * scale - vup[2] * scale;
 190                                 tvxyz[1][0] = rd->origin[0] - vright[0] * scale + vup[0] * scale;
 191                                 tvxyz[1][1] = rd->origin[1] - vright[1] * scale + vup[1] * scale;
 192                                 tvxyz[1][2] = rd->origin[2] - vright[2] * scale + vup[2] * scale;
 193                                 tvxyz[2][0] = rd->origin[0] + vright[0] * scale + vup[0] * scale;
 194                                 tvxyz[2][1] = rd->origin[1] + vright[1] * scale + vup[1] * scale;
 195                                 tvxyz[2][2] = rd->origin[2] + vright[2] * scale + vup[2] * scale;
 196                                 tvxyz[3][0] = rd->origin[0] + vright[0] * scale - vup[0] * scale;
 197                                 tvxyz[3][1] = rd->origin[1] + vright[1] * scale - vup[1] * scale;
 198                                 tvxyz[3][2] = rd->origin[2] + vright[2] * scale - vup[2] * scale;
 199                                 R_Mesh_Draw(&m);
 200                         }
 201                 }
 202         }
 203 }
 204
 205 /*
 206 =============================================================================
 207
 208 DYNAMIC LIGHTS
 209
 210 =============================================================================
 211 */
 212
 213 /*
 214 =============
 215 R_MarkLights
 216 =============
 217 */
 218 static void R_OldMarkLights (vec3_t lightorigin, rdlight_t *rd, int bit, int bitindex, mnode_t *node)
 219 {
 220         float           ndist, maxdist;
 221         msurface_t      *surf;
 222         mleaf_t         *leaf;
 223         int                     i;
 224
 225         if (!r_dynamic.integer)
 226                 return;
 227
 228         // for comparisons to minimum acceptable light
 229         maxdist = rd->cullradius2;
 230
 231 loc0:
 232         if (node->contents < 0)
 233         {
 234                 if (node->contents != CONTENTS_SOLID)
 235                 {
 236                         leaf = (mleaf_t *)node;
 237                         if (leaf->dlightframe != r_framecount) // not dynamic until now
 238                         {
 239                                 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;
 240                                 leaf->dlightframe = r_framecount;
 241                         }
 242                         leaf->dlightbits[bitindex] |= bit;
 243                 }
 244                 return;
 245         }
 246
 247         ndist = PlaneDiff(lightorigin, node->plane);
 248
 249         if (ndist > rd->cullradius)
 250         {
 251                 node = node->children[0];
 252                 goto loc0;
 253         }
 254         if (ndist < -rd->cullradius)
 255         {
 256                 node = node->children[1];
 257                 goto loc0;
 258         }
 259
 260 // mark the polygons
 261         surf = currentrenderentity->model->surfaces + node->firstsurface;
 262         for (i=0 ; i<node->numsurfaces ; i++, surf++)
 263         {
 264                 int d, impacts, impactt;
 265                 float dist, dist2, impact[3];
 266                 if (surf->visframe != r_framecount)
 267                         continue;
 268                 dist = ndist;
 269                 if (surf->flags & SURF_PLANEBACK)
 270                         dist = -dist;
 271
 272                 if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 273                         continue;
 274
 275                 dist2 = dist * dist;
 276                 if (dist2 >= maxdist)
 277                         continue;
 278
 279                 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
 280                 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
 281                 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
 282
 283                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 284
 285                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 286                 dist2 += d * d;
 287                 if (dist2 > maxdist)
 288                         continue;
 289
 290                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 291
 292                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 293                 dist2 += d * d;
 294                 if (dist2 > maxdist)
 295                         continue;
 296
 297
 298                 /*
 299                 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 300
 301                 if (d < 0)
 302                 {
 303                         dist2 += d * d;
 304                         if (dist2 >= maxdist)
 305                                 continue;
 306                 }
 307                 else
 308                 {
 309                         d -= surf->extents[0] + 16;
 310                         if (d > 0)
 311                         {
 312                                 dist2 += d * d;
 313                                 if (dist2 >= maxdist)
 314                                         continue;
 315                         }
 316                 }
 317
 318                 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 319
 320                 if (d < 0)
 321                 {
 322                         dist2 += d * d;
 323                         if (dist2 >= maxdist)
 324                                 continue;
 325                 }
 326                 else
 327                 {
 328                         d -= surf->extents[1] + 16;
 329                         if (d > 0)
 330                         {
 331                                 dist2 += d * d;
 332                                 if (dist2 >= maxdist)
 333                                         continue;
 334                         }
 335                 }
 336                 */
 337
 338                 if (surf->dlightframe != r_framecount) // not dynamic until now
 339                 {
 340                         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;
 341                         surf->dlightframe = r_framecount;
 342                 }
 343                 surf->dlightbits[bitindex] |= bit;
 344
 345                 /*
 346                 if (((surf->flags & SURF_PLANEBACK) == 0) == ((PlaneDist(lightorigin, surf->plane)) >= surf->plane->dist))
 347                 {
 348                         if (surf->dlightframe != r_framecount) // not dynamic until now
 349                         {
 350                                 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;
 351                                 surf->dlightframe = r_framecount;
 352                         }
 353                         surf->dlightbits[bitindex] |= bit;
 354                 }
 355                 */
 356         }
 357
 358         if (node->children[0]->contents >= 0)
 359         {
 360                 if (node->children[1]->contents >= 0)
 361                 {
 362                         R_OldMarkLights (lightorigin, rd, bit, bitindex, node->children[0]);
 363                         node = node->children[1];
 364                         goto loc0;
 365                 }
 366                 else
 367                 {
 368                         node = node->children[0];
 369                         goto loc0;
 370                 }
 371         }
 372         else if (node->children[1]->contents >= 0)
 373         {
 374                 node = node->children[1];
 375                 goto loc0;
 376         }
 377 }
 378
 379 /*
 380 static void R_NoVisMarkLights (rdlight_t *rd, int bit, int bitindex)
 381 {
 382         vec3_t lightorigin;
 383         softwareuntransform(rd->origin, lightorigin);
 384
 385         R_OldMarkLights(lightorigin, rd, bit, bitindex, currentrenderentity->model->nodes + currentrenderentity->model->hulls[0].firstclipnode);
 386 }
 387 */
 388
 389 static void R_VisMarkLights (rdlight_t *rd, int bit, int bitindex)
 390 {
 391         static int lightframe = 0;
 392         mleaf_t *pvsleaf;
 393         vec3_t lightorigin;
 394         model_t *model;
 395         int             i, k, m, c, leafnum;
 396         msurface_t *surf, **mark;
 397         mleaf_t *leaf;
 398         byte    *in;
 399         int             row;
 400         float   low[3], high[3], dist, maxdist;
 401
 402         if (!r_dynamic.integer)
 403                 return;
 404
 405         model = currentrenderentity->model;
 406         softwareuntransform(rd->origin, lightorigin);
 407
 408         if (!r_vismarklights.integer)
 409         {
 410                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 411                 return;
 412         }
 413
 414         pvsleaf = Mod_PointInLeaf (lightorigin, model);
 415         if (pvsleaf == NULL)
 416         {
 417                 Con_Printf("R_VisMarkLights: NULL leaf??\n");
 418                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 419                 return;
 420         }
 421
 422         in = pvsleaf->compressed_vis;
 423         if (!in)
 424         {
 425                 // no vis info, so make all visible
 426                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 427                 return;
 428         }
 429
 430         lightframe++;
 431
 432         low[0] = lightorigin[0] - rd->cullradius;low[1] = lightorigin[1] - rd->cullradius;low[2] = lightorigin[2] - rd->cullradius;
 433         high[0] = lightorigin[0] + rd->cullradius;high[1] = lightorigin[1] + rd->cullradius;high[2] = lightorigin[2] + rd->cullradius;
 434
 435         // for comparisons to minimum acceptable light
 436         maxdist = rd->cullradius2;
 437
 438         row = (model->numleafs+7)>>3;
 439
 440         k = 0;
 441         while (k < row)
 442         {
 443                 c = *in++;
 444                 if (c)
 445                 {
 446                         for (i = 0;i < 8;i++)
 447                         {
 448                                 if (c & (1<<i))
 449                                 {
 450                                         // warning to the clumsy: numleafs is one less than it should be, it only counts leafs with vis bits (skips leaf 0)
 451                                         leafnum = (k << 3)+i+1;
 452                                         if (leafnum > model->numleafs)
 453                                                 return;
 454                                         leaf = &model->leafs[leafnum];
 455                                         if (leaf->visframe != r_framecount
 456                                          || leaf->contents == CONTENTS_SOLID
 457                                          || leaf->mins[0] > high[0] || leaf->maxs[0] < low[0]
 458                                          || leaf->mins[1] > high[1] || leaf->maxs[1] < low[1]
 459                                          || leaf->mins[2] > high[2] || leaf->maxs[2] < low[2])
 460                                                 continue;
 461                                         if (leaf->dlightframe != r_framecount)
 462                                         {
 463                                                 // not dynamic until now
 464                                                 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;
 465                                                 leaf->dlightframe = r_framecount;
 466                                         }
 467                                         leaf->dlightbits[bitindex] |= bit;
 468                                         if ((m = leaf->nummarksurfaces))
 469                                         {
 470                                                 mark = leaf->firstmarksurface;
 471                                                 do
 472                                                 {
 473                                                         surf = *mark++;
 474                                                         // if not visible in current frame, or already marked because it was in another leaf we passed, skip
 475                                                         if (surf->lightframe == lightframe)
 476                                                                 continue;
 477                                                         surf->lightframe = lightframe;
 478                                                         if (surf->visframe != r_framecount)
 479                                                                 continue;
 480                                                         dist = PlaneDiff(lightorigin, surf->plane);
 481                                                         if (surf->flags & SURF_PLANEBACK)
 482                                                                 dist = -dist;
 483                                                         // LordHavoc: make sure it is infront of the surface and not too far away
 484                                                         if (dist < rd->cullradius && (dist > -0.25f || ((surf->flags & SURF_LIGHTBOTHSIDES) && dist > -rd->cullradius)))
 485                                                         {
 486                                                                 int d;
 487                                                                 int impacts, impactt;
 488                                                                 float dist2, impact[3];
 489
 490                                                                 dist2 = dist * dist;
 491
 492                                                                 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
 493                                                                 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
 494                                                                 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
 495
 496 #if 0
 497                                                                 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 498                                                                 if (d < 0)
 499                                                                 {
 500                                                                         dist2 += d * d;
 501                                                                         if (dist2 > maxdist)
 502                                                                                 continue;
 503                                                                 }
 504                                                                 else
 505                                                                 {
 506                                                                         d -= surf->extents[0];
 507                                                                         if (d < 0)
 508                                                                         {
 509                                                                                 dist2 += d * d;
 510                                                                                 if (dist2 > maxdist)
 511                                                                                         continue;
 512                                                                         }
 513                                                                 }
 514
 515                                                                 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 516                                                                 if (d < 0)
 517                                                                 {
 518                                                                         dist2 += d * d;
 519                                                                         if (dist2 > maxdist)
 520                                                                                 continue;
 521                                                                 }
 522                                                                 else
 523                                                                 {
 524                                                                         d -= surf->extents[1];
 525                                                                         if (d < 0)
 526                                                                         {
 527                                                                                 dist2 += d * d;
 528                                                                                 if (dist2 > maxdist)
 529                                                                                         continue;
 530                                                                         }
 531                                                                 }
 532
 533 #else
 534
 535                                                                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 536                                                                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 537                                                                 dist2 += d * d;
 538                                                                 if (dist2 > maxdist)
 539                                                                         continue;
 540
 541                                                                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 542                                                                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 543                                                                 dist2 += d * d;
 544                                                                 if (dist2 > maxdist)
 545                                                                         continue;
 546
 547 #endif
 548
 549                                                                 if (surf->dlightframe != r_framecount) // not dynamic until now
 550                                                                 {
 551                                                                         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;
 552                                                                         surf->dlightframe = r_framecount;
 553                                                                 }
 554                                                                 surf->dlightbits[bitindex] |= bit;
 555                                                         }
 556                                                 }
 557                                                 while (--m);
 558                                         }
 559                                 }
 560                         }
 561                         k++;
 562                         continue;
 563                 }
 564
 565                 k += *in++;
 566         }
 567 }
 568
 569 void R_MarkLights(void)
 570 {
 571         int i;
 572         for (i = 0;i < r_numdlights;i++)
 573                 R_VisMarkLights (r_dlight + i, 1 << (i & 31), i >> 5);
 574 }
 575
 576 /*
 577 =============================================================================
 578
 579 LIGHT SAMPLING
 580
 581 =============================================================================
 582 */
 583
 584 static int RecursiveLightPoint (vec3_t color, mnode_t *node, float x, float y, float startz, float endz)
 585 {
 586         int             side, distz = endz - startz;
 587         float   front, back;
 588         float   mid;
 589
 590 loc0:
 591         if (node->contents < 0)
 592                 return false;           // didn't hit anything
 593
 594         switch (node->plane->type)
 595         {
 596         case PLANE_X:
 597                 node = node->children[x < node->plane->dist];
 598                 goto loc0;
 599         case PLANE_Y:
 600                 node = node->children[y < node->plane->dist];
 601                 goto loc0;
 602         case PLANE_Z:
 603                 side = startz < node->plane->dist;
 604                 if ((endz < node->plane->dist) == side)
 605                 {
 606                         node = node->children[side];
 607                         goto loc0;
 608                 }
 609                 // found an intersection
 610 //              mid = startz + (endz - startz) * (startz - node->plane->dist) / (startz - endz);
 611 //              mid = startz + distz * (startz - node->plane->dist) / (-distz);
 612 //              mid = startz + (-(startz - node->plane->dist));
 613 //              mid = startz - (startz - node->plane->dist);
 614 //              mid = startz + node->plane->dist - startz;
 615                 mid = node->plane->dist;
 616                 break;
 617         default:
 618                 back = front = x * node->plane->normal[0] + y * node->plane->normal[1];
 619                 front += startz * node->plane->normal[2];
 620                 back += endz * node->plane->normal[2];
 621                 side = front < node->plane->dist;
 622                 if ((back < node->plane->dist) == side)
 623                 {
 624                         node = node->children[side];
 625                         goto loc0;
 626                 }
 627                 // found an intersection
 628 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / ((front - node->plane->dist) - (back - node->plane->dist)));
 629 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / (front - back));
 630                 mid = startz + distz * (front - node->plane->dist) / (front - back);
 631                 break;
 632         }
 633
 634         // go down front side
 635         if (node->children[side]->contents >= 0 && RecursiveLightPoint (color, node->children[side], x, y, startz, mid))
 636                 return true;    // hit something
 637         else
 638         {
 639                 // check for impact on this node
 640                 if (node->numsurfaces)
 641                 {
 642                         int i, ds, dt;
 643                         msurface_t *surf;
 644
 645                         surf = cl.worldmodel->surfaces + node->firstsurface;
 646                         for (i = 0;i < node->numsurfaces;i++, surf++)
 647                         {
 648                                 if (!(surf->flags & SURF_LIGHTMAP))
 649                                         continue;       // no lightmaps
 650
 651                                 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]);
 652                                 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]);
 653
 654                                 if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 655                                         continue;
 656
 657                                 ds -= surf->texturemins[0];
 658                                 dt -= surf->texturemins[1];
 659
 660                                 if (ds > surf->extents[0] || dt > surf->extents[1])
 661                                         continue;
 662
 663                                 if (surf->samples)
 664                                 {
 665                                         byte *lightmap;
 666                                         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;
 667                                         line3 = ((surf->extents[0]>>4)+1)*3;
 668                                         size3 = ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 669
 670                                         lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 671
 672                                         for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 673                                         {
 674                                                 scale = d_lightstylevalue[surf->styles[maps]];
 675                                                 r00 += lightmap[      0] * scale;g00 += lightmap[      1] * scale;b00 += lightmap[      2] * scale;
 676                                                 r01 += lightmap[      3] * scale;g01 += lightmap[      4] * scale;b01 += lightmap[      5] * scale;
 677                                                 r10 += lightmap[line3+0] * scale;g10 += lightmap[line3+1] * scale;b10 += lightmap[line3+2] * scale;
 678                                                 r11 += lightmap[line3+3] * scale;g11 += lightmap[line3+4] * scale;b11 += lightmap[line3+5] * scale;
 679                                                 lightmap += size3;
 680                                         }
 681
 682                                         /*
 683                                         // LordHavoc: here's the readable version of the interpolation
 684                                         // code, not quite as easy for the compiler to optimize...
 685
 686                                         // dsfrac is the X position in the lightmap pixel, * 16
 687                                         // dtfrac is the Y position in the lightmap pixel, * 16
 688                                         // r00 is top left corner, r01 is top right corner
 689                                         // r10 is bottom left corner, r11 is bottom right corner
 690                                         // g and b are the same layout.
 691                                         // r0 and r1 are the top and bottom intermediate results
 692
 693                                         // first we interpolate the top two points, to get the top
 694                                         // edge sample
 695                                         r0 = (((r01-r00) * dsfrac) >> 4) + r00;
 696                                         g0 = (((g01-g00) * dsfrac) >> 4) + g00;
 697                                         b0 = (((b01-b00) * dsfrac) >> 4) + b00;
 698                                         // then we interpolate the bottom two points, to get the
 699                                         // bottom edge sample
 700                                         r1 = (((r11-r10) * dsfrac) >> 4) + r10;
 701                                         g1 = (((g11-g10) * dsfrac) >> 4) + g10;
 702                                         b1 = (((b11-b10) * dsfrac) >> 4) + b10;
 703                                         // then we interpolate the top and bottom samples to get the
 704                                         // middle sample (the one which was requested)
 705                                         r = (((r1-r0) * dtfrac) >> 4) + r0;
 706                                         g = (((g1-g0) * dtfrac) >> 4) + g0;
 707                                         b = (((b1-b0) * dtfrac) >> 4) + b0;
 708                                         */
 709
 710                                         color[0] += (float) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)) * (1.0f / 32768.0f);
 711                                         color[1] += (float) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)) * (1.0f / 32768.0f);
 712                                         color[2] += (float) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)) * (1.0f / 32768.0f);
 713                                 }
 714                                 return true; // success
 715                         }
 716                 }
 717
 718                 // go down back side
 719                 node = node->children[side ^ 1];
 720                 startz = mid;
 721                 distz = endz - startz;
 722                 goto loc0;
 723 //              return RecursiveLightPoint (color, node->children[side ^ 1], x, y, mid, endz);
 724         }
 725 }
 726
 727 void R_CompleteLightPoint (vec3_t color, vec3_t p, int dynamic, mleaf_t *leaf)
 728 {
 729         int      i, *dlightbits;
 730         vec3_t dist;
 731         float f;
 732         rdlight_t *rd;
 733         if (leaf == NULL)
 734                 leaf = Mod_PointInLeaf(p, cl.worldmodel);
 735
 736         if (leaf->contents == CONTENTS_SOLID)
 737         {
 738                 color[0] = color[1] = color[2] = 0;
 739                 return;
 740         }
 741
 742         if (r_fullbright.integer || !cl.worldmodel->lightdata)
 743         {
 744                 color[0] = color[1] = color[2] = 2;
 745                 return;
 746         }
 747
 748         color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
 749         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 750
 751         if (dynamic && leaf->dlightframe == r_framecount)
 752         {
 753                 dlightbits = leaf->dlightbits;
 754                 for (i = 0;i < r_numdlights;i++)
 755                 {
 756                         if (!(dlightbits[i >> 5] & (1 << (i & 31))))
 757                                 continue;
 758                         rd = r_dlight + i;
 759                         VectorSubtract (p, rd->origin, dist);
 760                         f = DotProduct(dist, dist) + LIGHTOFFSET;
 761                         if (f < rd->cullradius2)
 762                         {
 763                                 f = (1.0f / f) - rd->lightsubtract;
 764                                 if (f > 0)
 765                                         VectorMA(color, f, rd->light, color);
 766                         }
 767                 }
 768         }
 769 }
 770
 771 void R_ModelLightPoint (vec3_t color, vec3_t p, int *dlightbits)
 772 {
 773         mleaf_t *leaf;
 774         leaf = Mod_PointInLeaf(p, cl.worldmodel);
 775         if (leaf->contents == CONTENTS_SOLID)
 776         {
 777                 color[0] = color[1] = color[2] = 0;
 778                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 779                 return;
 780         }
 781
 782         if (r_fullbright.integer || !cl.worldmodel->lightdata)
 783         {
 784                 color[0] = color[1] = color[2] = 2;
 785                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 786                 return;
 787         }
 788
 789         color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
 790         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 791
 792         if (leaf->dlightframe == r_framecount)
 793         {
 794                 dlightbits[0] = leaf->dlightbits[0];
 795                 dlightbits[1] = leaf->dlightbits[1];
 796                 dlightbits[2] = leaf->dlightbits[2];
 797                 dlightbits[3] = leaf->dlightbits[3];
 798                 dlightbits[4] = leaf->dlightbits[4];
 799                 dlightbits[5] = leaf->dlightbits[5];
 800                 dlightbits[6] = leaf->dlightbits[6];
 801                 dlightbits[7] = leaf->dlightbits[7];
 802         }
 803         else
 804                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 805 }
 806
 807 void R_LightModel(int numverts)
 808 {
 809         int i, j, nearlights = 0;
 810         float color[3], basecolor[3], v[3], t, *av, *avn, *avc, a, number, f, hardness, hardnessoffset, dist2;
 811         struct
 812         {
 813                 vec3_t origin;
 814                 vec_t cullradius2;
 815                 vec3_t light;
 816                 vec_t lightsubtract;
 817         }
 818         nearlight[MAX_DLIGHTS], *nl;
 819         int modeldlightbits[8];
 820         //staticlight_t *sl;
 821         a = currentrenderentity->alpha;
 822         if (currentrenderentity->effects & EF_FULLBRIGHT)
 823                 basecolor[0] = basecolor[1] = basecolor[2] = 1;
 824         else
 825         {
 826                 if (r_lightmodels.integer)
 827                 {
 828                         R_ModelLightPoint(basecolor, currentrenderentity->origin, modeldlightbits);
 829
 830                         nl = &nearlight[0];
 831                         /*
 832                         // this code is unused for now
 833                         for (i = 0, sl = staticlight;i < staticlights && nearlights < MAX_DLIGHTS;i++, sl++)
 834                         {
 835                                 if (TraceLine(currentrenderentity->origin, sl->origin, NULL, NULL, 0) == 1)
 836                                 {
 837                                         nl->fadetype = sl->fadetype;
 838                                         nl->distancescale = sl->distancescale;
 839                                         nl->radius = sl->radius;
 840                                         VectorCopy(sl->origin, nl->origin);
 841                                         VectorCopy(sl->color, nl->light);
 842                                         nl->cullradius2 = 99999999;
 843                                         nl->lightsubtract = 0;
 844                                         nl++;
 845                                         nearlights++;
 846                                 }
 847                         }
 848                         */
 849                         for (i = 0;i < r_numdlights && nearlights < MAX_DLIGHTS;i++)
 850                         {
 851                                 if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
 852                                         continue;
 853                                 if (currentrenderentity == r_dlight[i].ent)
 854                                 {
 855                                         f = (1.0f / LIGHTOFFSET) - nl->lightsubtract;
 856                                         if (f > 0)
 857                                                 VectorMA(basecolor, f, r_dlight[i].light, basecolor);
 858                                 }
 859                                 else
 860                                 {
 861                                         // convert 0-255 radius coloring to 0-1, while also amplifying the brightness by 16
 862                                         //if (TraceLine(currentrenderentity->origin, r_dlight[i].origin, NULL, NULL, 0) == 1)
 863                                         {
 864                                                 // transform the light into the model's coordinate system
 865                                                 //if (gl_transform.integer)
 866                                                 //      softwareuntransform(r_dlight[i].origin, nl->origin);
 867                                                 //else
 868                                                         VectorCopy(r_dlight[i].origin, nl->origin);
 869                                                 nl->cullradius2 = r_dlight[i].cullradius2;
 870                                                 VectorCopy(r_dlight[i].light, nl->light);
 871                                                 nl->lightsubtract = r_dlight[i].lightsubtract;
 872                                                 nl++;
 873                                                 nearlights++;
 874                                         }
 875                                 }
 876                         }
 877                 }
 878                 else
 879                         R_CompleteLightPoint (basecolor, currentrenderentity->origin, true, NULL);
 880         }
 881         avc = aliasvertcolor;
 882         if (nearlights)
 883         {
 884                 av = aliasvert;
 885                 avn = aliasvertnorm;
 886                 hardness = r_lightmodelhardness.value;
 887                 hardnessoffset = (1.0f - hardness);
 888                 for (i = 0;i < numverts;i++)
 889                 {
 890                         VectorCopy(basecolor, color);
 891                         for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 892                         {
 893                                 // distance attenuation
 894                                 VectorSubtract(nl->origin, av, v);
 895                                 dist2 = DotProduct(v,v);
 896                                 if (dist2 < nl->cullradius2)
 897                                 {
 898                                         f = (1.0f / (dist2 + LIGHTOFFSET)) - nl->lightsubtract;
 899                                         if (f > 0)
 900                                         {
 901                                                 // directional shading
 902                                                 #if SLOWMATH
 903                                                 t = 1.0f / sqrt(dist2);
 904                                                 #else
 905                                                 number = DotProduct(v, v);
 906                                                 *((long *)&t) = 0x5f3759df - ((* (long *) &number) >> 1);
 907                                                 t = t * (1.5f - (number * 0.5f * t * t));
 908                                                 #endif
 909                                                 // DotProduct(avn,v) * t is dotproduct with a normalized v,
 910                                                 // the hardness variables are for backlighting/shinyness
 911                                                 f *= DotProduct(avn,v) * t * hardness + hardnessoffset;
 912                                                 if (f > 0)
 913                                                         VectorMA(color, f, nl->light, color);
 914                                         }
 915                                 }
 916                         }
 917
 918                         VectorCopy(color, avc);
 919                         avc[3] = a;
 920                         avc += 4;
 921                         av += 4;
 922                         avn += 3;
 923                 }
 924         }
 925         else
 926         {
 927                 for (i = 0;i < numverts;i++)
 928                 {
 929                         VectorCopy(basecolor, avc);
 930                         avc[3] = a;
 931                         avc += 4;
 932                 }
 933         }
 934 }