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 #include "cl_collision.h"
  24 #include "r_shadow.h"
  25
  26 rdlight_t r_dlight[MAX_DLIGHTS];
  27 int r_numdlights = 0;
  28
  29 cvar_t r_modellights = {CVAR_SAVE, "r_modellights", "4"};
  30 cvar_t r_vismarklights = {0, "r_vismarklights", "1"};
  31 cvar_t r_coronas = {CVAR_SAVE, "r_coronas", "1"};
  32 cvar_t gl_flashblend = {CVAR_SAVE, "gl_flashblend", "1"};
  33
  34 static rtexture_t *lightcorona;
  35 static rtexturepool_t *lighttexturepool;
  36
  37 void r_light_start(void)
  38 {
  39         float dx, dy;
  40         int x, y, a;
  41         qbyte pixels[32][32][4];
  42         lighttexturepool = R_AllocTexturePool();
  43         for (y = 0;y < 32;y++)
  44         {
  45                 dy = (y - 15.5f) * (1.0f / 16.0f);
  46                 for (x = 0;x < 32;x++)
  47                 {
  48                         dx = (x - 15.5f) * (1.0f / 16.0f);
  49                         a = ((1.0f / (dx * dx + dy * dy + 0.2f)) - (1.0f / (1.0f + 0.2))) * 32.0f / (1.0f / (1.0f + 0.2));
  50                         a = bound(0, a, 255);
  51                         pixels[y][x][0] = a;
  52                         pixels[y][x][1] = a;
  53                         pixels[y][x][2] = a;
  54                         pixels[y][x][3] = 255;
  55                 }
  56         }
  57         lightcorona = R_LoadTexture2D(lighttexturepool, "lightcorona", 32, 32, &pixels[0][0][0], TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
  58 }
  59
  60 void r_light_shutdown(void)
  61 {
  62         lighttexturepool = NULL;
  63         lightcorona = NULL;
  64 }
  65
  66 void r_light_newmap(void)
  67 {
  68         int i;
  69         for (i = 0;i < 256;i++)
  70                 d_lightstylevalue[i] = 264;             // normal light value
  71 }
  72
  73 void R_Light_Init(void)
  74 {
  75         Cvar_RegisterVariable(&r_modellights);
  76         Cvar_RegisterVariable(&r_vismarklights);
  77         Cvar_RegisterVariable(&r_coronas);
  78         Cvar_RegisterVariable(&gl_flashblend);
  79         R_RegisterModule("R_Light", r_light_start, r_light_shutdown, r_light_newmap);
  80 }
  81
  82 /*
  83 ==================
  84 R_AnimateLight
  85 ==================
  86 */
  87 void R_AnimateLight (void)
  88 {
  89         int i, j, k;
  90
  91 //
  92 // light animations
  93 // 'm' is normal light, 'a' is no light, 'z' is double bright
  94         i = (int)(cl.time * 10);
  95         for (j = 0;j < MAX_LIGHTSTYLES;j++)
  96         {
  97                 if (!cl_lightstyle || !cl_lightstyle[j].length)
  98                 {
  99                         d_lightstylevalue[j] = 256;
 100                         continue;
 101                 }
 102                 k = i % cl_lightstyle[j].length;
 103                 k = cl_lightstyle[j].map[k] - 'a';
 104                 k = k*22;
 105                 d_lightstylevalue[j] = k;
 106         }
 107 }
 108
 109
 110 void R_BuildLightList(void)
 111 {
 112         int i;
 113         dlight_t *cd;
 114         rdlight_t *rd;
 115
 116         r_numdlights = 0;
 117         c_dlights = 0;
 118
 119         if (!r_dynamic.integer || !cl_dlights)
 120                 return;
 121
 122         for (i = 0;i < MAX_DLIGHTS;i++)
 123         {
 124                 cd = cl_dlights + i;
 125                 if (cd->radius <= 0)
 126                         continue;
 127                 rd = &r_dlight[r_numdlights++];
 128                 VectorCopy(cd->origin, rd->origin);
 129                 VectorScale(cd->color, cd->radius * 64.0f, rd->light);
 130                 rd->cullradius2 = DotProduct(rd->light, rd->light) * (0.25f / (64.0f * 64.0f)) + 4096.0f;
 131                 // clamp radius to avoid overflowing division table in lightmap code
 132                 if (rd->cullradius2 > (2048.0f * 2048.0f))
 133                         rd->cullradius2 = (2048.0f * 2048.0f);
 134                 rd->cullradius = sqrt(rd->cullradius2);
 135                 rd->subtract = 1.0f / rd->cullradius2;
 136                 rd->ent = cd->ent;
 137                 c_dlights++; // count every dlight in use
 138         }
 139 }
 140
 141 void R_DrawCoronas(void)
 142 {
 143         int i;
 144         float cscale, scale, viewdist, dist;
 145         rdlight_t *rd;
 146         if (!r_coronas.integer)
 147                 return;
 148         R_Mesh_Matrix(&r_identitymatrix);
 149         viewdist = DotProduct(r_origin, vpn);
 150         for (i = 0;i < r_numdlights;i++)
 151         {
 152                 rd = r_dlight + i;
 153                 dist = (DotProduct(rd->origin, vpn) - viewdist);
 154                 if (dist >= 24.0f && CL_TraceLine(rd->origin, r_origin, NULL, NULL, 0, true, NULL) == 1)
 155                 {
 156                         cscale = (1.0f / 131072.0f);
 157                         scale = rd->cullradius * 0.25f;
 158                         if (gl_flashblend.integer)
 159                         {
 160                                 cscale *= 4.0f;
 161                                 scale *= 2.0f;
 162                         }
 163                         R_DrawSprite(GL_ONE, GL_ONE, lightcorona, true, rd->origin, vright, vup, scale, -scale, -scale, scale, rd->light[0] * cscale, rd->light[1] * cscale, rd->light[2] * cscale, 1);
 164                 }
 165         }
 166 }
 167
 168 /*
 169 =============================================================================
 170
 171 DYNAMIC LIGHTS
 172
 173 =============================================================================
 174 */
 175
 176 /*
 177 =============
 178 R_MarkLights
 179 =============
 180 */
 181 static void R_OldMarkLights (entity_render_t *ent, vec3_t lightorigin, rdlight_t *rd, int bit, int bitindex, mnode_t *node)
 182 {
 183         float ndist, maxdist;
 184         msurface_t *surf;
 185         int i, *surfacepvsframes;
 186         int d, impacts, impactt;
 187         float dist, dist2, impact[3];
 188
 189         if (!r_dynamic.integer)
 190                 return;
 191
 192         // for comparisons to minimum acceptable light
 193         maxdist = rd->cullradius2;
 194
 195         surfacepvsframes = ent->model->brushq1.surfacepvsframes;
 196 loc0:
 197         if (node->contents < 0)
 198                 return;
 199
 200         ndist = PlaneDiff(lightorigin, node->plane);
 201
 202         if (ndist > rd->cullradius)
 203         {
 204                 node = node->children[0];
 205                 goto loc0;
 206         }
 207         if (ndist < -rd->cullradius)
 208         {
 209                 node = node->children[1];
 210                 goto loc0;
 211         }
 212
 213 // mark the polygons
 214         surf = ent->model->brushq1.surfaces + node->firstsurface;
 215         for (i = 0;i < node->numsurfaces;i++, surf++)
 216         {
 217                 if (surfacepvsframes[surf->number] != ent->model->brushq1.pvsframecount)
 218                         continue;
 219                 dist = ndist;
 220                 if (surf->flags & SURF_PLANEBACK)
 221                         dist = -dist;
 222
 223                 if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 224                         continue;
 225
 226                 dist2 = dist * dist;
 227                 if (dist2 >= maxdist)
 228                         continue;
 229
 230                 if (node->plane->type < 3)
 231                 {
 232                         VectorCopy(lightorigin, impact);
 233                         impact[node->plane->type] -= dist;
 234                 }
 235                 else
 236                 {
 237                         impact[0] = lightorigin[0] - surf->plane->normal[0] * dist;
 238                         impact[1] = lightorigin[1] - surf->plane->normal[1] * dist;
 239                         impact[2] = lightorigin[2] - surf->plane->normal[2] * dist;
 240                 }
 241
 242                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 243
 244                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 245                 dist2 += d * d;
 246                 if (dist2 > maxdist)
 247                         continue;
 248
 249                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 250
 251                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 252                 dist2 += d * d;
 253                 if (dist2 > maxdist)
 254                         continue;
 255
 256                 if (surf->dlightframe != r_framecount) // not dynamic until now
 257                 {
 258                         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;
 259                         surf->dlightframe = r_framecount;
 260                         if (r_dlightmap.integer)
 261                                 surf->cached_dlight = true;
 262                 }
 263                 surf->dlightbits[bitindex] |= bit;
 264         }
 265
 266         if (node->children[0]->contents >= 0)
 267         {
 268                 if (node->children[1]->contents >= 0)
 269                 {
 270                         R_OldMarkLights (ent, lightorigin, rd, bit, bitindex, node->children[0]);
 271                         node = node->children[1];
 272                         goto loc0;
 273                 }
 274                 else
 275                 {
 276                         node = node->children[0];
 277                         goto loc0;
 278                 }
 279         }
 280         else if (node->children[1]->contents >= 0)
 281         {
 282                 node = node->children[1];
 283                 goto loc0;
 284         }
 285 }
 286
 287
 288 static void R_VisMarkLights (entity_render_t *ent, rdlight_t *rd, int bit, int bitindex)
 289 {
 290         static int lightframe = 0;
 291         mleaf_t *pvsleaf;
 292         vec3_t lightorigin;
 293         model_t *model;
 294         int i, k, m, c, leafnum, *surfacepvsframes, *mark;
 295         msurface_t *surf;
 296         mleaf_t *leaf;
 297         qbyte *in;
 298         int row;
 299         float low[3], high[3], dist, maxdist;
 300
 301         if (!r_dynamic.integer || !ent->model)
 302                 return;
 303
 304         Matrix4x4_Transform(&ent->inversematrix, rd->origin, lightorigin);
 305
 306         model = ent->model;
 307         pvsleaf = model->brushq1.PointInLeaf(model, lightorigin);
 308         if (pvsleaf == NULL)
 309                 return;
 310
 311         in = pvsleaf->compressed_vis;
 312         if (!r_vismarklights.integer || !in)
 313         {
 314                 // told not to use pvs, or there's no pvs to use
 315                 R_OldMarkLights(ent, lightorigin, rd, bit, bitindex, model->brushq1.nodes + model->brushq1.hulls[0].firstclipnode);
 316                 return;
 317         }
 318
 319         lightframe++;
 320
 321         low[0] = lightorigin[0] - rd->cullradius;low[1] = lightorigin[1] - rd->cullradius;low[2] = lightorigin[2] - rd->cullradius;
 322         high[0] = lightorigin[0] + rd->cullradius;high[1] = lightorigin[1] + rd->cullradius;high[2] = lightorigin[2] + rd->cullradius;
 323
 324         // for comparisons to minimum acceptable light
 325         maxdist = rd->cullradius2;
 326
 327         row = (model->brushq1.numleafs+7)>>3;
 328         surfacepvsframes = model->brushq1.surfacepvsframes;
 329
 330         k = 0;
 331         while (k < row)
 332         {
 333                 c = *in++;
 334                 if (c)
 335                 {
 336                         for (i = 0;i < 8;i++)
 337                         {
 338                                 if (c & (1<<i))
 339                                 {
 340                                         // warning to the clumsy: numleafs is one less than it should be, it only counts leafs with vis bits (skips leaf 0)
 341                                         leafnum = (k << 3)+i+1;
 342                                         if (leafnum > model->brushq1.numleafs)
 343                                                 return;
 344                                         leaf = &model->brushq1.leafs[leafnum];
 345                                         if (leaf->mins[0] > high[0] || leaf->maxs[0] < low[0]
 346                                          || leaf->mins[1] > high[1] || leaf->maxs[1] < low[1]
 347                                          || leaf->mins[2] > high[2] || leaf->maxs[2] < low[2])
 348                                                 continue;
 349                                         if ((m = leaf->nummarksurfaces))
 350                                         {
 351                                                 mark = leaf->firstmarksurface;
 352                                                 do
 353                                                 {
 354                                                         surf = model->brushq1.surfaces + *mark++;
 355                                                         // if not visible in current frame, or already marked because it was in another leaf we passed, skip
 356                                                         if (surf->lightframe == lightframe)
 357                                                                 continue;
 358                                                         surf->lightframe = lightframe;
 359                                                         if (surfacepvsframes[surf->number] != model->brushq1.pvsframecount)
 360                                                                 continue;
 361                                                         dist = PlaneDiff(lightorigin, surf->plane);
 362                                                         if (surf->flags & SURF_PLANEBACK)
 363                                                                 dist = -dist;
 364                                                         // LordHavoc: make sure it is infront of the surface and not too far away
 365                                                         if (dist < rd->cullradius && (dist > -0.25f || ((surf->flags & SURF_LIGHTBOTHSIDES) && dist > -rd->cullradius)))
 366                                                         {
 367                                                                 int d;
 368                                                                 int impacts, impactt;
 369                                                                 float dist2, impact[3];
 370
 371                                                                 dist2 = dist * dist;
 372
 373                                                                 if (surf->plane->type < 3)
 374                                                                 {
 375                                                                         VectorCopy(lightorigin, impact);
 376                                                                         impact[surf->plane->type] -= dist;
 377                                                                 }
 378                                                                 else
 379                                                                 {
 380                                                                         impact[0] = lightorigin[0] - surf->plane->normal[0] * dist;
 381                                                                         impact[1] = lightorigin[1] - surf->plane->normal[1] * dist;
 382                                                                         impact[2] = lightorigin[2] - surf->plane->normal[2] * dist;
 383                                                                 }
 384
 385                                                                 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 386                                                                 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 387                                                                 dist2 += d * d;
 388                                                                 if (dist2 > maxdist)
 389                                                                         continue;
 390
 391                                                                 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 392                                                                 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 393                                                                 dist2 += d * d;
 394                                                                 if (dist2 > maxdist)
 395                                                                         continue;
 396
 397                                                                 if (surf->dlightframe != r_framecount) // not dynamic until now
 398                                                                 {
 399                                                                         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;
 400                                                                         surf->dlightframe = r_framecount;
 401                                                                         if (r_dlightmap.integer)
 402                                                                                 surf->cached_dlight = true;
 403                                                                 }
 404                                                                 surf->dlightbits[bitindex] |= bit;
 405                                                         }
 406                                                 }
 407                                                 while (--m);
 408                                         }
 409                                 }
 410                         }
 411                         k++;
 412                         continue;
 413                 }
 414
 415                 k += *in++;
 416         }
 417 }
 418
 419 void R_MarkLights(entity_render_t *ent)
 420 {
 421         int i;
 422         if (!gl_flashblend.integer)
 423                 for (i = 0;i < r_numdlights;i++)
 424                         R_VisMarkLights (ent, r_dlight + i, 1 << (i & 31), i >> 5);
 425 }
 426
 427 /*
 428 =============================================================================
 429
 430 LIGHT SAMPLING
 431
 432 =============================================================================
 433 */
 434
 435 void R_CompleteLightPoint(vec3_t ambientcolor, vec3_t diffusecolor, vec3_t diffusenormal, const vec3_t p, int dynamic, const mleaf_t *leaf)
 436 {
 437         VectorClear(diffusecolor);
 438         VectorClear(diffusenormal);
 439
 440         if (!r_fullbright.integer && cl.worldmodel && cl.worldmodel->brush.LightPoint)
 441         {
 442                 ambientcolor[0] = ambientcolor[1] = ambientcolor[2] = r_ambient.value * (2.0f / 128.0f);
 443                 cl.worldmodel->brush.LightPoint(cl.worldmodel, p, ambientcolor, diffusecolor, diffusenormal);
 444         }
 445         else
 446                 VectorSet(ambientcolor, 1, 1, 1);
 447
 448         /*
 449         if (leaf == NULL && cl.worldmodel != NULL)
 450                 leaf = cl.worldmodel->brushq1.PointInLeaf(cl.worldmodel, p);
 451         if (!leaf || leaf->contents == CONTENTS_SOLID || !cl.worldmodel->brushq1.lightdata)
 452         {
 453                 VectorSet(ambientcolor, 1, 1, 1);
 454                 return;
 455         }
 456         */
 457
 458         // FIXME: this .lights related stuff needs to be ported into the Mod_Q1BSP code
 459         if (cl.worldmodel->brushq1.numlights)
 460         {
 461                 int i;
 462                 vec3_t v;
 463                 float f;
 464                 mlight_t *sl;
 465                 for (i = 0;i < cl.worldmodel->brushq1.numlights;i++)
 466                 {
 467                         sl = cl.worldmodel->brushq1.lights + i;
 468                         if (d_lightstylevalue[sl->style] > 0)
 469                         {
 470                                 VectorSubtract (p, sl->origin, v);
 471                                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract);
 472                                 if (f > 0 && CL_TraceLine(p, sl->origin, NULL, NULL, 0, false, NULL) == 1)
 473                                 {
 474                                         f *= d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 475                                         VectorMA(ambientcolor, f, sl->light, ambientcolor);
 476                                 }
 477                         }
 478                 }
 479         }
 480
 481         if (dynamic)
 482         {
 483                 int i;
 484                 float f, v[3];
 485                 rdlight_t *rd;
 486                 // FIXME: this really should handle dlights as diffusecolor/diffusenormal somehow
 487                 for (i = 0;i < r_numdlights;i++)
 488                 {
 489                         rd = r_dlight + i;
 490                         VectorSubtract(p, rd->origin, v);
 491                         f = DotProduct(v, v);
 492                         if (f < rd->cullradius2 && CL_TraceLine(p, rd->origin, NULL, NULL, 0, false, NULL) == 1)
 493                         {
 494                                 f = (1.0f / (f + LIGHTOFFSET)) - rd->subtract;
 495                                 VectorMA(ambientcolor, f, rd->light, ambientcolor);
 496                         }
 497                 }
 498         }
 499 }
 500
 501 typedef struct
 502 {
 503         vec3_t origin;
 504         //vec_t cullradius2;
 505         vec3_t light;
 506         // how much this light would contribute to ambient if replaced
 507         vec3_t ambientlight;
 508         vec_t subtract;
 509         vec_t falloff;
 510         vec_t offset;
 511         // used for choosing only the brightest lights
 512         vec_t intensity;
 513 }
 514 nearlight_t;
 515
 516 static int nearlights;
 517 static nearlight_t nearlight[MAX_DLIGHTS];
 518
 519 int R_LightModel(float *ambient4f, float *diffusecolor, float *diffusenormal, const entity_render_t *ent, float colorr, float colorg, float colorb, float colora, int worldcoords)
 520 {
 521         int i, j, maxnearlights;
 522         float v[3], f, mscale, stylescale, intensity, ambientcolor[3];
 523         nearlight_t *nl;
 524         mlight_t *sl;
 525         rdlight_t *rd;
 526
 527         nearlights = 0;
 528         maxnearlights = r_modellights.integer;
 529         ambient4f[0] = ambient4f[1] = ambient4f[2] = r_ambient.value * (2.0f / 128.0f);
 530         VectorClear(diffusecolor);
 531         VectorClear(diffusenormal);
 532         if (r_fullbright.integer || (ent->effects & EF_FULLBRIGHT))
 533         {
 534                 // highly rare
 535                 VectorSet(ambient4f, 1, 1, 1);
 536                 maxnearlights = 0;
 537         }
 538         else if (r_shadow_realtime_world.integer)
 539                 maxnearlights = 0;
 540         else
 541         {
 542                 if (cl.worldmodel && cl.worldmodel->brush.LightPoint)
 543                         cl.worldmodel->brush.LightPoint(cl.worldmodel, ent->origin, ambient4f, diffusecolor, diffusenormal);
 544                 else
 545                         VectorSet(ambient4f, 1, 1, 1);
 546         }
 547
 548         // scale of the model's coordinate space, to alter light attenuation to match
 549         // make the mscale squared so it can scale the squared distance results
 550         mscale = ent->scale * ent->scale;
 551         // FIXME: no support for .lights on non-Q1BSP?
 552         nl = &nearlight[0];
 553         for (i = 0;i < ent->numentlights;i++)
 554         {
 555                 sl = cl.worldmodel->brushq1.lights + ent->entlights[i];
 556                 stylescale = d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 557                 VectorSubtract (ent->origin, sl->origin, v);
 558                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract) * stylescale;
 559                 VectorScale(sl->light, f, ambientcolor);
 560                 intensity = DotProduct(ambientcolor, ambientcolor);
 561                 if (f < 0)
 562                         intensity *= -1.0f;
 563                 if (nearlights < maxnearlights)
 564                         j = nearlights++;
 565                 else
 566                 {
 567                         for (j = 0;j < maxnearlights;j++)
 568                         {
 569                                 if (nearlight[j].intensity < intensity)
 570                                 {
 571                                         if (nearlight[j].intensity > 0)
 572                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 573                                         break;
 574                                 }
 575                         }
 576                 }
 577                 if (j >= maxnearlights)
 578                 {
 579                         // this light is less significant than all others,
 580                         // add it to ambient
 581                         if (intensity > 0)
 582                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 583                 }
 584                 else
 585                 {
 586                         nl = nearlight + j;
 587                         nl->intensity = intensity;
 588                         // transform the light into the model's coordinate system
 589                         if (worldcoords)
 590                                 VectorCopy(sl->origin, nl->origin);
 591                         else
 592                                 Matrix4x4_Transform(&ent->inversematrix, sl->origin, nl->origin);
 593                         // integrate mscale into falloff, for maximum speed
 594                         nl->falloff = sl->falloff * mscale;
 595                         VectorCopy(ambientcolor, nl->ambientlight);
 596                         nl->light[0] = sl->light[0] * stylescale * colorr * 4.0f;
 597                         nl->light[1] = sl->light[1] * stylescale * colorg * 4.0f;
 598                         nl->light[2] = sl->light[2] * stylescale * colorb * 4.0f;
 599                         nl->subtract = sl->subtract;
 600                         nl->offset = sl->distbias;
 601                 }
 602         }
 603         if (!r_shadow_realtime_dlight.integer)
 604         {
 605                 for (i = 0;i < r_numdlights;i++)
 606                 {
 607                         rd = r_dlight + i;
 608                         VectorCopy(rd->origin, v);
 609                         if (v[0] < ent->mins[0]) v[0] = ent->mins[0];if (v[0] > ent->maxs[0]) v[0] = ent->maxs[0];
 610                         if (v[1] < ent->mins[1]) v[1] = ent->mins[1];if (v[1] > ent->maxs[1]) v[1] = ent->maxs[1];
 611                         if (v[2] < ent->mins[2]) v[2] = ent->mins[2];if (v[2] > ent->maxs[2]) v[2] = ent->maxs[2];
 612                         VectorSubtract (v, rd->origin, v);
 613                         if (DotProduct(v, v) < rd->cullradius2)
 614                         {
 615                                 if (CL_TraceLine(ent->origin, rd->origin, NULL, NULL, 0, false, NULL) != 1)
 616                                         continue;
 617                                 VectorSubtract (ent->origin, rd->origin, v);
 618                                 f = ((1.0f / (DotProduct(v, v) + LIGHTOFFSET)) - rd->subtract);
 619                                 VectorScale(rd->light, f, ambientcolor);
 620                                 intensity = DotProduct(ambientcolor, ambientcolor);
 621                                 if (f < 0)
 622                                         intensity *= -1.0f;
 623                                 if (nearlights < maxnearlights)
 624                                         j = nearlights++;
 625                                 else
 626                                 {
 627                                         for (j = 0;j < maxnearlights;j++)
 628                                         {
 629                                                 if (nearlight[j].intensity < intensity)
 630                                                 {
 631                                                         if (nearlight[j].intensity > 0)
 632                                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 633                                                         break;
 634                                                 }
 635                                         }
 636                                 }
 637                                 if (j >= maxnearlights)
 638                                 {
 639                                         // this light is less significant than all others,
 640                                         // add it to ambient
 641                                         if (intensity > 0)
 642                                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 643                                 }
 644                                 else
 645                                 {
 646                                         nl = nearlight + j;
 647                                         nl->intensity = intensity;
 648                                         // transform the light into the model's coordinate system
 649                                         if (worldcoords)
 650                                                 VectorCopy(rd->origin, nl->origin);
 651                                         else
 652                                         {
 653                                                 Matrix4x4_Transform(&ent->inversematrix, rd->origin, nl->origin);
 654                                                 /*
 655                                                 Con_Printf("%i %s : %f %f %f : %f %f %f\n%f %f %f %f\n%f %f %f %f\n%f %f %f %f\n%f %f %f %f\n"
 656                                                 , rd - r_dlight, ent->model->name
 657                                                 , rd->origin[0], rd->origin[1], rd->origin[2]
 658                                                 , nl->origin[0], nl->origin[1], nl->origin[2]
 659                                                 , ent->inversematrix.m[0][0], ent->inversematrix.m[0][1], ent->inversematrix.m[0][2], ent->inversematrix.m[0][3]
 660                                                 , ent->inversematrix.m[1][0], ent->inversematrix.m[1][1], ent->inversematrix.m[1][2], ent->inversematrix.m[1][3]
 661                                                 , ent->inversematrix.m[2][0], ent->inversematrix.m[2][1], ent->inversematrix.m[2][2], ent->inversematrix.m[2][3]
 662                                                 , ent->inversematrix.m[3][0], ent->inversematrix.m[3][1], ent->inversematrix.m[3][2], ent->inversematrix.m[3][3]);
 663                                                 */
 664                                         }
 665                                         // integrate mscale into falloff, for maximum speed
 666                                         nl->falloff = mscale;
 667                                         VectorCopy(ambientcolor, nl->ambientlight);
 668                                         nl->light[0] = rd->light[0] * colorr * 4.0f;
 669                                         nl->light[1] = rd->light[1] * colorg * 4.0f;
 670                                         nl->light[2] = rd->light[2] * colorb * 4.0f;
 671                                         nl->subtract = rd->subtract;
 672                                         nl->offset = LIGHTOFFSET;
 673                                 }
 674                         }
 675                 }
 676         }
 677         ambient4f[0] *= colorr;
 678         ambient4f[1] *= colorg;
 679         ambient4f[2] *= colorb;
 680         ambient4f[3] = colora;
 681         diffusecolor[0] *= colorr;
 682         diffusecolor[1] *= colorg;
 683         diffusecolor[2] *= colorb;
 684         return nearlights != 0 || DotProduct(diffusecolor, diffusecolor) > 0;
 685 }
 686
 687 void R_LightModel_CalcVertexColors(const float *ambientcolor4f, const float *diffusecolor, const float *diffusenormal, int numverts, const float *vertex3f, const float *normal3f, float *color4f)
 688 {
 689         int i, j, usediffuse;
 690         float color[4], v[3], dot, dist2, f, dnormal[3];
 691         nearlight_t *nl;
 692         usediffuse = DotProduct(diffusecolor, diffusecolor) > 0;
 693         VectorCopy(diffusenormal, dnormal);
 694         if (usediffuse)
 695                 VectorNormalize(dnormal);
 696         // directional shading code here
 697         for (i = 0;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
 698         {
 699                 VectorCopy4(ambientcolor4f, color);
 700
 701                 // silly directional diffuse shading
 702                 if (usediffuse)
 703                 {
 704                         dot = DotProduct(normal3f, dnormal);
 705                         if (dot > 0)
 706                                 VectorMA(color, dot, diffusecolor, color);
 707                 }
 708
 709                 // pretty good lighting
 710                 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 711                 {
 712                         VectorSubtract(vertex3f, nl->origin, v);
 713                         // first eliminate negative lighting (back side)
 714                         dot = DotProduct(normal3f, v);
 715                         if (dot > 0)
 716                         {
 717                                 // we'll need this again later to normalize the dotproduct
 718                                 dist2 = DotProduct(v,v);
 719                                 // do the distance attenuation math
 720                                 f = (1.0f / (dist2 * nl->falloff + nl->offset)) - nl->subtract;
 721                                 if (f > 0)
 722                                 {
 723                                         // we must divide dot by sqrt(dist2) to compensate for
 724                                         // the fact we did not normalize v before doing the
 725                                         // dotproduct, the result is in the range 0 to 1 (we
 726                                         // eliminated negative numbers already)
 727                                         f *= dot / sqrt(dist2);
 728                                         // blend in the lighting
 729                                         VectorMA(color, f, nl->light, color);
 730                                 }
 731                         }
 732                 }
 733                 VectorCopy4(color, color4f);
 734         }
 735 }
 736
 737 void R_UpdateEntLights(entity_render_t *ent)
 738 {
 739         int i;
 740         const mlight_t *sl;
 741         vec3_t v;
 742         if (r_shadow_realtime_dlight.integer || gl_flashblend.integer)
 743                 return;
 744         VectorSubtract(ent->origin, ent->entlightsorigin, v);
 745         if (ent->entlightsframe != (r_framecount - 1) || (realtime > ent->entlightstime && DotProduct(v,v) >= 1.0f))
 746         {
 747                 ent->entlightstime = realtime + 0.1;
 748                 VectorCopy(ent->origin, ent->entlightsorigin);
 749                 ent->numentlights = 0;
 750                 if (cl.worldmodel)
 751                         for (i = 0, sl = cl.worldmodel->brushq1.lights;i < cl.worldmodel->brushq1.numlights && ent->numentlights < MAXENTLIGHTS;i++, sl++)
 752                                 if (CL_TraceLine(ent->origin, sl->origin, NULL, NULL, 0, false, NULL) == 1)
 753                                         ent->entlights[ent->numentlights++] = i;
 754         }
 755         ent->entlightsframe = r_framecount;
 756 }
 757