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                         // for testing the size of the corona textures
  54                         if (a == 0)
  55                         {
  56                                 pixels[y][x][0] = 255;
  57                                 pixels[y][x][1] = 0;
  58                                 pixels[y][x][2] = 0;
  59                                 pixels[y][x][3] = 255;
  60                         }
  61                         */
  62                 }
  63         }
  64         lightcorona = R_LoadTexture (lighttexturepool, "lightcorona", 32, 32, &pixels[0][0][0], TEXTYPE_RGBA, TEXF_PRECACHE | TEXF_ALPHA);
  65 }
  66
  67 void r_light_shutdown(void)
  68 {
  69         lighttexturepool = NULL;
  70         lightcorona = NULL;
  71 }
  72
  73 void r_light_newmap(void)
  74 {
  75 }
  76
  77 void R_Light_Init(void)
  78 {
  79         Cvar_RegisterVariable(&r_lightmodels);
  80         Cvar_RegisterVariable(&r_lightmodelhardness);
  81         Cvar_RegisterVariable(&r_vismarklights);
  82         R_RegisterModule("R_Light", r_light_start, r_light_shutdown, r_light_newmap);
  83 }
  84
  85 /*
  86 ==================
  87 R_AnimateLight
  88 ==================
  89 */
  90 void R_AnimateLight (void)
  91 {
  92         int i, j, k;
  93
  94 //
  95 // light animations
  96 // 'm' is normal light, 'a' is no light, 'z' is double bright
  97         i = (int)(cl.time * 10);
  98         for (j = 0;j < MAX_LIGHTSTYLES;j++)
  99         {
 100                 if (!cl_lightstyle[j].length)
 101                 {
 102                         d_lightstylevalue[j] = 256;
 103                         continue;
 104                 }
 105                 k = i % cl_lightstyle[j].length;
 106                 k = cl_lightstyle[j].map[k] - 'a';
 107                 k = k*22;
 108                 d_lightstylevalue[j] = k;
 109         }
 110 }
 111
 112
 113 void R_BuildLightList(void)
 114 {
 115         int                     i;
 116         dlight_t        *cd;
 117         rdlight_t       *rd;
 118
 119         r_numdlights = 0;
 120         c_dlights = 0;
 121
 122         if (!r_dynamic.integer)
 123                 return;
 124
 125         for (i = 0;i < MAX_DLIGHTS;i++)
 126         {
 127                 cd = cl_dlights + i;
 128                 if (cd->radius <= 0)
 129                         continue;
 130                 rd = &r_dlight[r_numdlights++];
 131                 VectorCopy(cd->origin, rd->origin);
 132                 VectorScale(cd->color, cd->radius * 128.0f, rd->light);
 133                 rd->cullradius = (1.0f / 128.0f) * sqrt(DotProduct(rd->light, rd->light));
 134                 // clamp radius to avoid overflowing division table in lightmap code
 135                 if (rd->cullradius > 2048.0f)
 136                         rd->cullradius = 2048.0f;
 137                 rd->cullradius2 = rd->cullradius * rd->cullradius;
 138                 rd->lightsubtract = 1.0f / rd->cullradius2;
 139                 rd->ent = cd->ent;
 140                 r_numdlights++;
 141                 c_dlights++; // count every dlight in use
 142         }
 143 }
 144
 145 static int coronapolyindex[6] = {0, 1, 2, 0, 2, 3};
 146
 147 void R_DrawCoronas(void)
 148 {
 149         int i;
 150         rmeshinfo_t m;
 151         float tvxyz[4][4], tvst[4][2], scale, viewdist, diff[3], dist;
 152         rdlight_t *rd;
 153         memset(&m, 0, sizeof(m));
 154         m.transparent = false;
 155         m.blendfunc1 = GL_SRC_ALPHA;
 156         m.blendfunc2 = GL_ONE;
 157         m.depthdisable = true; // magic
 158         m.numtriangles = 2;
 159         m.numverts = 4;
 160         m.index = coronapolyindex;
 161         m.vertex = &tvxyz[0][0];
 162         m.vertexstep = sizeof(float[4]);
 163         m.tex[0] = R_GetTexture(lightcorona);
 164         m.texcoords[0] = &tvst[0][0];
 165         m.texcoordstep[0] = sizeof(float[2]);
 166         tvst[0][0] = 0;
 167         tvst[0][1] = 0;
 168         tvst[1][0] = 0;
 169         tvst[1][1] = 1;
 170         tvst[2][0] = 1;
 171         tvst[2][1] = 1;
 172         tvst[3][0] = 1;
 173         tvst[3][1] = 0;
 174         viewdist = DotProduct(r_origin, vpn);
 175         for (i = 0;i < r_numdlights;i++)
 176         {
 177                 rd = r_dlight + i;
 178                 dist = (DotProduct(rd->origin, vpn) - viewdist);
 179                 if (dist >= 24.0f)
 180                 {
 181                         // trace to a point just barely closer to the eye
 182                         VectorSubtract(rd->origin, vpn, diff);
 183                         if (TraceLine(r_origin, diff, NULL, NULL, 0) == 1)
 184                         {
 185                                 scale = 1.0f / 65536.0f;//64.0f / (dist * dist + 1024.0f);
 186                                 m.cr = rd->light[0] * scale;
 187                                 m.cg = rd->light[1] * scale;
 188                                 m.cb = rd->light[2] * scale;
 189                                 m.ca = 1;
 190                                 if (fogenabled)
 191                                 {
 192                                         VectorSubtract(rd->origin, r_origin, diff);
 193                                         m.ca *= 1 - exp(fogdensity/DotProduct(diff,diff));
 194                                 }
 195                                 // make it larger in the distance to keep a consistent size
 196                                 //scale = 0.4f * dist;
 197                                 scale = 128.0f;
 198                                 tvxyz[0][0] = rd->origin[0] - vright[0] * scale - vup[0] * scale;
 199                                 tvxyz[0][1] = rd->origin[1] - vright[1] * scale - vup[1] * scale;
 200                                 tvxyz[0][2] = rd->origin[2] - vright[2] * scale - vup[2] * scale;
 201                                 tvxyz[1][0] = rd->origin[0] - vright[0] * scale + vup[0] * scale;
 202                                 tvxyz[1][1] = rd->origin[1] - vright[1] * scale + vup[1] * scale;
 203                                 tvxyz[1][2] = rd->origin[2] - vright[2] * scale + vup[2] * scale;
 204                                 tvxyz[2][0] = rd->origin[0] + vright[0] * scale + vup[0] * scale;
 205                                 tvxyz[2][1] = rd->origin[1] + vright[1] * scale + vup[1] * scale;
 206                                 tvxyz[2][2] = rd->origin[2] + vright[2] * scale + vup[2] * scale;
 207                                 tvxyz[3][0] = rd->origin[0] + vright[0] * scale - vup[0] * scale;
 208                                 tvxyz[3][1] = rd->origin[1] + vright[1] * scale - vup[1] * scale;
 209                                 tvxyz[3][2] = rd->origin[2] + vright[2] * scale - vup[2] * scale;
 210                                 R_Mesh_DrawDecal(&m);
 211                         }
 212                 }
 213         }
 214 }
 215
 216 /*
 217 =============================================================================
 218
 219 DYNAMIC LIGHTS
 220
 221 =============================================================================
 222 */
 223
 224 /*
 225 =============
 226 R_MarkLights
 227 =============
 228 */
 229 static void R_OldMarkLights (vec3_t lightorigin, rdlight_t *rd, int bit, int bitindex, mnode_t *node)
 230 {
 231         float           ndist, maxdist;
 232         msurface_t      *surf;
 233         mleaf_t         *leaf;
 234         int                     i;
 235
 236         if (!r_dynamic.integer)
 237                 return;
 238
 239         // for comparisons to minimum acceptable light
 240         maxdist = rd->cullradius2;
 241
 242 loc0:
 243         if (node->contents < 0)
 244         {
 245                 if (node->contents != CONTENTS_SOLID)
 246                 {
 247                         leaf = (mleaf_t *)node;
 248                         if (leaf->dlightframe != r_framecount) // not dynamic until now
 249                         {
 250                                 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;
 251                                 leaf->dlightframe = r_framecount;
 252                         }
 253                         leaf->dlightbits[bitindex] |= bit;
 254                 }
 255                 return;
 256         }
 257
 258         ndist = PlaneDiff(lightorigin, node->plane);
 259
 260         if (ndist > rd->cullradius)
 261         {
 262                 node = node->children[0];
 263                 goto loc0;
 264         }
 265         if (ndist < -rd->cullradius)
 266         {
 267                 node = node->children[1];
 268                 goto loc0;
 269         }
 270
 271 // mark the polygons
 272         surf = cl.worldmodel->surfaces + node->firstsurface;
 273         for (i=0 ; i<node->numsurfaces ; i++, surf++)
 274         {
 275                 int d, impacts, impactt;
 276                 float dist, dist2, impact[3];
 277                 if (surf->visframe != r_framecount)
 278                         continue;
 279                 dist = ndist;
 280                 if (surf->flags & SURF_PLANEBACK)
 281                         dist = -dist;
 282
 283                 if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 284                         continue;
 285
 286                 dist2 = dist * dist;
 287                 if (dist2 >= maxdist)
 288                         continue;
 289
 290                 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
 291                 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
 292                 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
 293
 294                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 295
 296                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 297                 dist2 += d * d;
 298                 if (dist2 > maxdist)
 299                         continue;
 300
 301                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 302
 303                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 304                 dist2 += d * d;
 305                 if (dist2 > maxdist)
 306                         continue;
 307
 308
 309                 /*
 310                 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 311
 312                 if (d < 0)
 313                 {
 314                         dist2 += d * d;
 315                         if (dist2 >= maxdist)
 316                                 continue;
 317                 }
 318                 else
 319                 {
 320                         d -= surf->extents[0] + 16;
 321                         if (d > 0)
 322                         {
 323                                 dist2 += d * d;
 324                                 if (dist2 >= maxdist)
 325                                         continue;
 326                         }
 327                 }
 328
 329                 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 330
 331                 if (d < 0)
 332                 {
 333                         dist2 += d * d;
 334                         if (dist2 >= maxdist)
 335                                 continue;
 336                 }
 337                 else
 338                 {
 339                         d -= surf->extents[1] + 16;
 340                         if (d > 0)
 341                         {
 342                                 dist2 += d * d;
 343                                 if (dist2 >= maxdist)
 344                                         continue;
 345                         }
 346                 }
 347                 */
 348
 349                 if (surf->dlightframe != r_framecount) // not dynamic until now
 350                 {
 351                         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;
 352                         surf->dlightframe = r_framecount;
 353                 }
 354                 surf->dlightbits[bitindex] |= bit;
 355
 356                 /*
 357                 if (((surf->flags & SURF_PLANEBACK) == 0) == ((PlaneDist(lightorigin, surf->plane)) >= surf->plane->dist))
 358                 {
 359                         if (surf->dlightframe != r_framecount) // not dynamic until now
 360                         {
 361                                 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;
 362                                 surf->dlightframe = r_framecount;
 363                         }
 364                         surf->dlightbits[bitindex] |= bit;
 365                 }
 366                 */
 367         }
 368
 369         if (node->children[0]->contents >= 0)
 370         {
 371                 if (node->children[1]->contents >= 0)
 372                 {
 373                         R_OldMarkLights (lightorigin, rd, bit, bitindex, node->children[0]);
 374                         node = node->children[1];
 375                         goto loc0;
 376                 }
 377                 else
 378                 {
 379                         node = node->children[0];
 380                         goto loc0;
 381                 }
 382         }
 383         else if (node->children[1]->contents >= 0)
 384         {
 385                 node = node->children[1];
 386                 goto loc0;
 387         }
 388 }
 389
 390 /*
 391 static void R_NoVisMarkLights (rdlight_t *rd, int bit, int bitindex)
 392 {
 393         vec3_t lightorigin;
 394         softwareuntransform(rd->origin, lightorigin);
 395
 396         R_OldMarkLights(lightorigin, rd, bit, bitindex, currentrenderentity->model->nodes + currentrenderentity->model->hulls[0].firstclipnode);
 397 }
 398 */
 399
 400 static void R_VisMarkLights (rdlight_t *rd, int bit, int bitindex)
 401 {
 402         static int lightframe = 0;
 403         mleaf_t *pvsleaf;
 404         vec3_t lightorigin;
 405         model_t *model;
 406         int             i, k, m, c, leafnum;
 407         msurface_t *surf, **mark;
 408         mleaf_t *leaf;
 409         byte    *in;
 410         int             row;
 411         float   low[3], high[3], dist, maxdist;
 412
 413         if (!r_dynamic.integer)
 414                 return;
 415
 416         model = currentrenderentity->model;
 417         softwareuntransform(rd->origin, lightorigin);
 418
 419         if (!r_vismarklights.integer)
 420         {
 421                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 422                 return;
 423         }
 424
 425         pvsleaf = Mod_PointInLeaf (lightorigin, model);
 426         if (pvsleaf == NULL)
 427         {
 428                 Con_Printf("R_VisMarkLights: NULL leaf??\n");
 429                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 430                 return;
 431         }
 432
 433         in = pvsleaf->compressed_vis;
 434         if (!in)
 435         {
 436                 // no vis info, so make all visible
 437                 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
 438                 return;
 439         }
 440
 441         lightframe++;
 442
 443         low[0] = lightorigin[0] - rd->cullradius;low[1] = lightorigin[1] - rd->cullradius;low[2] = lightorigin[2] - rd->cullradius;
 444         high[0] = lightorigin[0] + rd->cullradius;high[1] = lightorigin[1] + rd->cullradius;high[2] = lightorigin[2] + rd->cullradius;
 445
 446         // for comparisons to minimum acceptable light
 447         maxdist = rd->cullradius2;
 448
 449         row = (model->numleafs+7)>>3;
 450
 451         k = 0;
 452         while (k < row)
 453         {
 454                 c = *in++;
 455                 if (c)
 456                 {
 457                         for (i = 0;i < 8;i++)
 458                         {
 459                                 if (c & (1<<i))
 460                                 {
 461                                         // warning to the clumsy: numleafs is one less than it should be, it only counts leafs with vis bits (skips leaf 0)
 462                                         leafnum = (k << 3)+i+1;
 463                                         if (leafnum > model->numleafs)
 464                                                 return;
 465                                         leaf = &model->leafs[leafnum];
 466                                         if (leaf->visframe != r_framecount
 467                                          || leaf->contents == CONTENTS_SOLID
 468                                          || leaf->mins[0] > high[0] || leaf->maxs[0] < low[0]
 469                                          || leaf->mins[1] > high[1] || leaf->maxs[1] < low[1]
 470                                          || leaf->mins[2] > high[2] || leaf->maxs[2] < low[2])
 471                                                 continue;
 472                                         if (leaf->dlightframe != r_framecount)
 473                                         {
 474                                                 // not dynamic until now
 475                                                 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;
 476                                                 leaf->dlightframe = r_framecount;
 477                                         }
 478                                         leaf->dlightbits[bitindex] |= bit;
 479                                         if ((m = leaf->nummarksurfaces))
 480                                         {
 481                                                 mark = leaf->firstmarksurface;
 482                                                 do
 483                                                 {
 484                                                         surf = *mark++;
 485                                                         // if not visible in current frame, or already marked because it was in another leaf we passed, skip
 486                                                         if (surf->lightframe == lightframe)
 487                                                                 continue;
 488                                                         surf->lightframe = lightframe;
 489                                                         if (surf->visframe != r_framecount)
 490                                                                 continue;
 491                                                         dist = PlaneDiff(lightorigin, surf->plane);
 492                                                         if (surf->flags & SURF_PLANEBACK)
 493                                                                 dist = -dist;
 494                                                         // LordHavoc: make sure it is infront of the surface and not too far away
 495                                                         if (dist < rd->cullradius && (dist > -0.25f || ((surf->flags & SURF_LIGHTBOTHSIDES) && dist > -rd->cullradius)))
 496                                                         {
 497                                                                 int d;
 498                                                                 int impacts, impactt;
 499                                                                 float dist2, impact[3];
 500
 501                                                                 dist2 = dist * dist;
 502
 503                                                                 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
 504                                                                 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
 505                                                                 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
 506
 507 #if 0
 508                                                                 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 509                                                                 if (d < 0)
 510                                                                 {
 511                                                                         dist2 += d * d;
 512                                                                         if (dist2 > maxdist)
 513                                                                                 continue;
 514                                                                 }
 515                                                                 else
 516                                                                 {
 517                                                                         d -= surf->extents[0];
 518                                                                         if (d < 0)
 519                                                                         {
 520                                                                                 dist2 += d * d;
 521                                                                                 if (dist2 > maxdist)
 522                                                                                         continue;
 523                                                                         }
 524                                                                 }
 525
 526                                                                 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 527                                                                 if (d < 0)
 528                                                                 {
 529                                                                         dist2 += d * d;
 530                                                                         if (dist2 > maxdist)
 531                                                                                 continue;
 532                                                                 }
 533                                                                 else
 534                                                                 {
 535                                                                         d -= surf->extents[1];
 536                                                                         if (d < 0)
 537                                                                         {
 538                                                                                 dist2 += d * d;
 539                                                                                 if (dist2 > maxdist)
 540                                                                                         continue;
 541                                                                         }
 542                                                                 }
 543
 544 #else
 545
 546                                                                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 547                                                                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 548                                                                 dist2 += d * d;
 549                                                                 if (dist2 > maxdist)
 550                                                                         continue;
 551
 552                                                                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 553                                                                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 554                                                                 dist2 += d * d;
 555                                                                 if (dist2 > maxdist)
 556                                                                         continue;
 557
 558 #endif
 559
 560                                                                 if (surf->dlightframe != r_framecount) // not dynamic until now
 561                                                                 {
 562                                                                         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;
 563                                                                         surf->dlightframe = r_framecount;
 564                                                                 }
 565                                                                 surf->dlightbits[bitindex] |= bit;
 566                                                         }
 567                                                 }
 568                                                 while (--m);
 569                                         }
 570                                 }
 571                         }
 572                         k++;
 573                         continue;
 574                 }
 575
 576                 k += *in++;
 577         }
 578 }
 579
 580 void R_MarkLights(void)
 581 {
 582         int i;
 583         for (i = 0;i < r_numdlights;i++)
 584                 R_VisMarkLights (r_dlight + i, 1 << (i & 31), i >> 5);
 585 }
 586
 587 /*
 588 =============================================================================
 589
 590 LIGHT SAMPLING
 591
 592 =============================================================================
 593 */
 594
 595 static int RecursiveLightPoint (vec3_t color, mnode_t *node, float x, float y, float startz, float endz)
 596 {
 597         int             side, distz = endz - startz;
 598         float   front, back;
 599         float   mid;
 600
 601 loc0:
 602         if (node->contents < 0)
 603                 return false;           // didn't hit anything
 604
 605         switch (node->plane->type)
 606         {
 607         case PLANE_X:
 608                 node = node->children[x < node->plane->dist];
 609                 goto loc0;
 610         case PLANE_Y:
 611                 node = node->children[y < node->plane->dist];
 612                 goto loc0;
 613         case PLANE_Z:
 614                 side = startz < node->plane->dist;
 615                 if ((endz < node->plane->dist) == side)
 616                 {
 617                         node = node->children[side];
 618                         goto loc0;
 619                 }
 620                 // found an intersection
 621 //              mid = startz + (endz - startz) * (startz - node->plane->dist) / (startz - endz);
 622 //              mid = startz + distz * (startz - node->plane->dist) / (-distz);
 623 //              mid = startz + (-(startz - node->plane->dist));
 624 //              mid = startz - (startz - node->plane->dist);
 625 //              mid = startz + node->plane->dist - startz;
 626                 mid = node->plane->dist;
 627                 break;
 628         default:
 629                 back = front = x * node->plane->normal[0] + y * node->plane->normal[1];
 630                 front += startz * node->plane->normal[2];
 631                 back += endz * node->plane->normal[2];
 632                 side = front < node->plane->dist;
 633                 if ((back < node->plane->dist) == side)
 634                 {
 635                         node = node->children[side];
 636                         goto loc0;
 637                 }
 638                 // found an intersection
 639 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / ((front - node->plane->dist) - (back - node->plane->dist)));
 640 //              mid = startz + (endz - startz) * ((front - node->plane->dist) / (front - back));
 641                 mid = startz + distz * (front - node->plane->dist) / (front - back);
 642                 break;
 643         }
 644
 645         // go down front side
 646         if (node->children[side]->contents >= 0 && RecursiveLightPoint (color, node->children[side], x, y, startz, mid))
 647                 return true;    // hit something
 648         else
 649         {
 650                 // check for impact on this node
 651                 if (node->numsurfaces)
 652                 {
 653                         int i, ds, dt;
 654                         msurface_t *surf;
 655
 656                         surf = cl.worldmodel->surfaces + node->firstsurface;
 657                         for (i = 0;i < node->numsurfaces;i++, surf++)
 658                         {
 659                                 if (!(surf->flags & SURF_LIGHTMAP))
 660                                         continue;       // no lightmaps
 661
 662                                 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]);
 663                                 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]);
 664
 665                                 if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 666                                         continue;
 667
 668                                 ds -= surf->texturemins[0];
 669                                 dt -= surf->texturemins[1];
 670
 671                                 if (ds > surf->extents[0] || dt > surf->extents[1])
 672                                         continue;
 673
 674                                 if (surf->samples)
 675                                 {
 676                                         byte *lightmap;
 677                                         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;
 678                                         line3 = ((surf->extents[0]>>4)+1)*3;
 679                                         size3 = ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 680
 681                                         lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 682
 683                                         for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 684                                         {
 685                                                 scale = d_lightstylevalue[surf->styles[maps]];
 686                                                 r00 += lightmap[      0] * scale;g00 += lightmap[      1] * scale;b00 += lightmap[      2] * scale;
 687                                                 r01 += lightmap[      3] * scale;g01 += lightmap[      4] * scale;b01 += lightmap[      5] * scale;
 688                                                 r10 += lightmap[line3+0] * scale;g10 += lightmap[line3+1] * scale;b10 += lightmap[line3+2] * scale;
 689                                                 r11 += lightmap[line3+3] * scale;g11 += lightmap[line3+4] * scale;b11 += lightmap[line3+5] * scale;
 690                                                 lightmap += size3;
 691                                         }
 692
 693                                         /*
 694                                         // LordHavoc: here's the readable version of the interpolation
 695                                         // code, not quite as easy for the compiler to optimize...
 696
 697                                         // dsfrac is the X position in the lightmap pixel, * 16
 698                                         // dtfrac is the Y position in the lightmap pixel, * 16
 699                                         // r00 is top left corner, r01 is top right corner
 700                                         // r10 is bottom left corner, r11 is bottom right corner
 701                                         // g and b are the same layout.
 702                                         // r0 and r1 are the top and bottom intermediate results
 703
 704                                         // first we interpolate the top two points, to get the top
 705                                         // edge sample
 706                                         r0 = (((r01-r00) * dsfrac) >> 4) + r00;
 707                                         g0 = (((g01-g00) * dsfrac) >> 4) + g00;
 708                                         b0 = (((b01-b00) * dsfrac) >> 4) + b00;
 709                                         // then we interpolate the bottom two points, to get the
 710                                         // bottom edge sample
 711                                         r1 = (((r11-r10) * dsfrac) >> 4) + r10;
 712                                         g1 = (((g11-g10) * dsfrac) >> 4) + g10;
 713                                         b1 = (((b11-b10) * dsfrac) >> 4) + b10;
 714                                         // then we interpolate the top and bottom samples to get the
 715                                         // middle sample (the one which was requested)
 716                                         r = (((r1-r0) * dtfrac) >> 4) + r0;
 717                                         g = (((g1-g0) * dtfrac) >> 4) + g0;
 718                                         b = (((b1-b0) * dtfrac) >> 4) + b0;
 719                                         */
 720
 721                                         color[0] += (float) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)) * (1.0f / 32768.0f);
 722                                         color[1] += (float) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)) * (1.0f / 32768.0f);
 723                                         color[2] += (float) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)) * (1.0f / 32768.0f);
 724                                 }
 725                                 return true; // success
 726                         }
 727                 }
 728
 729                 // go down back side
 730                 node = node->children[side ^ 1];
 731                 startz = mid;
 732                 distz = endz - startz;
 733                 goto loc0;
 734 //              return RecursiveLightPoint (color, node->children[side ^ 1], x, y, mid, endz);
 735         }
 736 }
 737
 738 void R_CompleteLightPoint (vec3_t color, vec3_t p, int dynamic, mleaf_t *leaf)
 739 {
 740         int      i, *dlightbits;
 741         vec3_t dist;
 742         float f;
 743         rdlight_t *rd;
 744         if (leaf == NULL)
 745                 leaf = Mod_PointInLeaf(p, cl.worldmodel);
 746
 747         if (leaf->contents == CONTENTS_SOLID)
 748         {
 749                 color[0] = color[1] = color[2] = 0;
 750                 return;
 751         }
 752
 753         if (r_fullbright.integer || !cl.worldmodel->lightdata)
 754         {
 755                 color[0] = color[1] = color[2] = 2;
 756                 return;
 757         }
 758
 759         color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
 760         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 761
 762         if (dynamic && leaf->dlightframe == r_framecount)
 763         {
 764                 dlightbits = leaf->dlightbits;
 765                 for (i = 0;i < r_numdlights;i++)
 766                 {
 767                         if (!(dlightbits[i >> 5] & (1 << (i & 31))))
 768                                 continue;
 769                         rd = r_dlight + i;
 770                         VectorSubtract (p, rd->origin, dist);
 771                         f = DotProduct(dist, dist) + LIGHTOFFSET;
 772                         if (f < rd->cullradius2)
 773                         {
 774                                 f = (1.0f / f) - rd->lightsubtract;
 775                                 if (f > 0)
 776                                         VectorMA(color, f, rd->light, color);
 777                         }
 778                 }
 779         }
 780 }
 781
 782 void R_ModelLightPoint (vec3_t color, vec3_t p, int *dlightbits)
 783 {
 784         mleaf_t *leaf;
 785         leaf = Mod_PointInLeaf(p, cl.worldmodel);
 786         if (leaf->contents == CONTENTS_SOLID)
 787         {
 788                 color[0] = color[1] = color[2] = 0;
 789                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 790                 return;
 791         }
 792
 793         if (r_fullbright.integer || !cl.worldmodel->lightdata)
 794         {
 795                 color[0] = color[1] = color[2] = 2;
 796                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 797                 return;
 798         }
 799
 800         color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
 801         RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
 802
 803         if (leaf->dlightframe == r_framecount)
 804         {
 805                 dlightbits[0] = leaf->dlightbits[0];
 806                 dlightbits[1] = leaf->dlightbits[1];
 807                 dlightbits[2] = leaf->dlightbits[2];
 808                 dlightbits[3] = leaf->dlightbits[3];
 809                 dlightbits[4] = leaf->dlightbits[4];
 810                 dlightbits[5] = leaf->dlightbits[5];
 811                 dlightbits[6] = leaf->dlightbits[6];
 812                 dlightbits[7] = leaf->dlightbits[7];
 813         }
 814         else
 815                 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
 816 }
 817
 818 void R_LightModel(int numverts)
 819 {
 820         int i, j, nearlights = 0;
 821         float color[3], basecolor[3], v[3], t, *av, *avn, *avc, a, number, f, hardness, hardnessoffset, dist2;
 822         struct
 823         {
 824                 vec3_t origin;
 825                 vec_t cullradius2;
 826                 vec3_t light;
 827                 vec_t lightsubtract;
 828         }
 829         nearlight[MAX_DLIGHTS], *nl;
 830         int modeldlightbits[8];
 831         //staticlight_t *sl;
 832         a = currentrenderentity->alpha;
 833         if (currentrenderentity->effects & EF_FULLBRIGHT)
 834                 basecolor[0] = basecolor[1] = basecolor[2] = 1;
 835         else
 836         {
 837                 if (r_lightmodels.integer)
 838                 {
 839                         R_ModelLightPoint(basecolor, currentrenderentity->origin, modeldlightbits);
 840
 841                         nl = &nearlight[0];
 842                         /*
 843                         // this code is unused for now
 844                         for (i = 0, sl = staticlight;i < staticlights && nearlights < MAX_DLIGHTS;i++, sl++)
 845                         {
 846                                 if (TraceLine(currentrenderentity->origin, sl->origin, NULL, NULL, 0) == 1)
 847                                 {
 848                                         nl->fadetype = sl->fadetype;
 849                                         nl->distancescale = sl->distancescale;
 850                                         nl->radius = sl->radius;
 851                                         VectorCopy(sl->origin, nl->origin);
 852                                         VectorCopy(sl->color, nl->light);
 853                                         nl->cullradius2 = 99999999;
 854                                         nl->lightsubtract = 0;
 855                                         nl++;
 856                                         nearlights++;
 857                                 }
 858                         }
 859                         */
 860                         for (i = 0;i < r_numdlights && nearlights < MAX_DLIGHTS;i++)
 861                         {
 862                                 if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
 863                                         continue;
 864                                 if (currentrenderentity == r_dlight[i].ent)
 865                                 {
 866                                         f = (1.0f / LIGHTOFFSET) - nl->lightsubtract;
 867                                         if (f > 0)
 868                                                 VectorMA(basecolor, f, r_dlight[i].light, basecolor);
 869                                 }
 870                                 else
 871                                 {
 872                                         // convert 0-255 radius coloring to 0-1, while also amplifying the brightness by 16
 873                                         //if (TraceLine(currentrenderentity->origin, r_dlight[i].origin, NULL, NULL, 0) == 1)
 874                                         {
 875                                                 // transform the light into the model's coordinate system
 876                                                 //if (gl_transform.integer)
 877                                                 //      softwareuntransform(r_dlight[i].origin, nl->origin);
 878                                                 //else
 879                                                         VectorCopy(r_dlight[i].origin, nl->origin);
 880                                                 nl->cullradius2 = r_dlight[i].cullradius2;
 881                                                 VectorCopy(r_dlight[i].light, nl->light);
 882                                                 nl->lightsubtract = r_dlight[i].lightsubtract;
 883                                                 nl++;
 884                                                 nearlights++;
 885                                         }
 886                                 }
 887                         }
 888                 }
 889                 else
 890                         R_CompleteLightPoint (basecolor, currentrenderentity->origin, true, NULL);
 891         }
 892         avc = aliasvertcolor;
 893         if (nearlights)
 894         {
 895                 av = aliasvert;
 896                 avn = aliasvertnorm;
 897                 hardness = r_lightmodelhardness.value;
 898                 hardnessoffset = (1.0f - hardness);
 899                 for (i = 0;i < numverts;i++)
 900                 {
 901                         VectorCopy(basecolor, color);
 902                         for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 903                         {
 904                                 // distance attenuation
 905                                 VectorSubtract(nl->origin, av, v);
 906                                 dist2 = DotProduct(v,v);
 907                                 if (dist2 < nl->cullradius2)
 908                                 {
 909                                         f = (1.0f / (dist2 + LIGHTOFFSET)) - nl->lightsubtract;
 910                                         if (f > 0)
 911                                         {
 912                                                 // directional shading
 913                                                 #if SLOWMATH
 914                                                 t = 1.0f / sqrt(dist2);
 915                                                 #else
 916                                                 number = DotProduct(v, v);
 917                                                 *((long *)&t) = 0x5f3759df - ((* (long *) &number) >> 1);
 918                                                 t = t * (1.5f - (number * 0.5f * t * t));
 919                                                 #endif
 920                                                 // DotProduct(avn,v) * t is dotproduct with a normalized v,
 921                                                 // the hardness variables are for backlighting/shinyness
 922                                                 f *= DotProduct(avn,v) * t * hardness + hardnessoffset;
 923                                                 if (f > 0)
 924                                                         VectorMA(color, f, nl->light, color);
 925                                         }
 926                                 }
 927                         }
 928
 929                         VectorCopy(color, avc);
 930                         avc[3] = a;
 931                         avc += 4;
 932                         av += 3;
 933                         avn += 3;
 934                 }
 935         }
 936         else
 937         {
 938                 for (i = 0;i < numverts;i++)
 939                 {
 940                         VectorCopy(basecolor, avc);
 941                         avc[3] = a;
 942                         avc += 4;
 943                 }
 944         }
 945 }