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_UpdateLights
  85 ==================
  86 */
  87 void R_UpdateLights(void)
  88 {
  89         int i, j, k;
  90         dlight_t *cd;
  91         rdlight_t *rd;
  92
  93 // light animations
  94 // 'm' is normal light, 'a' is no light, 'z' is double bright
  95         i = (int)(cl.time * 10);
  96         for (j = 0;j < MAX_LIGHTSTYLES;j++)
  97         {
  98                 if (!cl_lightstyle || !cl_lightstyle[j].length)
  99                 {
 100                         d_lightstylevalue[j] = 256;
 101                         continue;
 102                 }
 103                 k = i % cl_lightstyle[j].length;
 104                 k = cl_lightstyle[j].map[k] - 'a';
 105                 k = k*22;
 106                 d_lightstylevalue[j] = k;
 107         }
 108
 109         r_numdlights = 0;
 110         c_dlights = 0;
 111
 112         if (!r_dynamic.integer || !cl_dlights)
 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, d_lightstylevalue[cd->style] * (1.0f / 256.0f), rd->color);
 123                 rd->radius = bound(0, cd->radius, 2048.0f);
 124                 VectorScale(rd->color, rd->radius * 64.0f, rd->light);
 125 #if 0
 126                 rd->cullradius2 = DotProduct(rd->light, rd->light) * (0.25f / (64.0f * 64.0f)) + 4096.0f;
 127                 // clamp radius to avoid overflowing division table in lightmap code
 128                 rd->cullradius2 = bound(0, rd->cullradius2, 2048.0f*2048.0f);
 129                 rd->cullradius = sqrt(rd->cullradius2);
 130 #else
 131                 rd->cullradius = rd->radius;
 132                 rd->cullradius2 = rd->cullradius * rd->cullradius;
 133 #endif
 134                 rd->subtract = 1.0f / rd->cullradius2;
 135                 rd->ent = cd->ent;
 136                 rd->cubemapnum = cd->cubemapnum;
 137                 rd->shadow = cd->shadow;
 138                 rd->corona = cd->corona;
 139
 140                 rd->matrix_lighttoworld = cd->matrix;
 141                 Matrix4x4_ConcatScale(&rd->matrix_lighttoworld, rd->cullradius);
 142                 Matrix4x4_Invert_Simple(&rd->matrix_worldtolight, &rd->matrix_lighttoworld);
 143                 Matrix4x4_Concat(&rd->matrix_worldtoattenuationxyz, &matrix_attenuationxyz, &rd->matrix_worldtolight);
 144                 Matrix4x4_Concat(&rd->matrix_worldtoattenuationz, &matrix_attenuationz, &rd->matrix_worldtolight);
 145
 146                 c_dlights++; // count every dlight in use
 147         }
 148 }
 149
 150 void R_DrawCoronas(void)
 151 {
 152         int i, lnum;
 153         float cscale, scale, viewdist, dist;
 154         rdlight_t *rd;
 155         worldlight_t *wl;
 156         if (!r_coronas.integer)
 157                 return;
 158         R_Mesh_Matrix(&r_identitymatrix);
 159         viewdist = DotProduct(r_vieworigin, r_viewforward);
 160         if (r_shadow_realtime_world.integer)
 161         {
 162                 for (lnum = 0, wl = r_shadow_worldlightchain;wl;wl = wl->next, lnum++)
 163                 {
 164                         if (wl->corona * r_coronas.value > 0 && (r_shadow_debuglight.integer < 0 || r_shadow_debuglight.integer == lnum) && (dist = (DotProduct(wl->origin, r_viewforward) - viewdist)) >= 24.0f && CL_TraceLine(wl->origin, r_vieworigin, NULL, NULL, true, NULL, SUPERCONTENTS_SOLID) == 1)
 165                         {
 166                                 cscale = wl->corona * r_coronas.value * 0.25f;
 167                                 scale = wl->radius * 0.25f;
 168                                 R_DrawSprite(GL_ONE, GL_ONE, lightcorona, true, rd->origin, r_viewright, r_viewup, scale, -scale, -scale, scale, wl->color[0] * cscale, wl->color[1] * cscale, wl->color[2] * cscale, 1);
 169                         }
 170                 }
 171         }
 172         for (i = 0;i < r_numdlights;i++)
 173         {
 174                 rd = r_dlight + i;
 175                 if (rd->corona * r_coronas.value > 0 && (dist = (DotProduct(rd->origin, r_viewforward) - viewdist)) >= 24.0f && CL_TraceLine(rd->origin, r_vieworigin, NULL, NULL, true, NULL, SUPERCONTENTS_SOLID) == 1)
 176                 {
 177                         cscale = rd->corona * r_coronas.value * 0.25f;
 178                         scale = rd->radius * 0.25f;
 179                         if (gl_flashblend.integer)
 180                         {
 181                                 cscale *= 4.0f;
 182                                 scale *= 2.0f;
 183                         }
 184                         R_DrawSprite(GL_ONE, GL_ONE, lightcorona, true, rd->origin, r_viewright, r_viewup, scale, -scale, -scale, scale, rd->color[0] * cscale, rd->color[1] * cscale, rd->color[2] * cscale, 1);
 185                 }
 186         }
 187 }
 188
 189 /*
 190 =============================================================================
 191
 192 DYNAMIC LIGHTS
 193
 194 =============================================================================
 195 */
 196
 197 static int lightpvsbytes;
 198 static qbyte lightpvs[(MAX_MAP_LEAFS+7)>>3];
 199
 200 /*
 201 =============
 202 R_MarkLights
 203 =============
 204 */
 205 static void R_RecursiveMarkLights(entity_render_t *ent, vec3_t lightorigin, rdlight_t *rd, int bit, int bitindex, mnode_t *node, qbyte *pvs, int pvsbits)
 206 {
 207         int i;
 208         mleaf_t *leaf;
 209         float dist;
 210
 211         // for comparisons to minimum acceptable light
 212         while(node->contents >= 0)
 213         {
 214                 dist = PlaneDiff(lightorigin, node->plane);
 215                 if (dist > rd->cullradius)
 216                         node = node->children[0];
 217                 else
 218                 {
 219                         if (dist >= -rd->cullradius)
 220                                 R_RecursiveMarkLights(ent, lightorigin, rd, bit, bitindex, node->children[0], pvs, pvsbits);
 221                         node = node->children[1];
 222                 }
 223         }
 224
 225         // check if leaf is visible according to pvs
 226         leaf = (mleaf_t *)node;
 227         i = (leaf - ent->model->brushq1.leafs) - 1;
 228         if (leaf->nummarksurfaces && (i >= pvsbits || pvs[i >> 3] & (1 << (i & 7))))
 229         {
 230                 int *surfacepvsframes, d, impacts, impactt;
 231                 float sdist, maxdist, dist2, impact[3];
 232                 msurface_t *surf;
 233                 // mark the polygons
 234                 maxdist = rd->cullradius2;
 235                 surfacepvsframes = ent->model->brushq1.surfacepvsframes;
 236                 for (i = 0;i < leaf->nummarksurfaces;i++)
 237                 {
 238                         if (surfacepvsframes[leaf->firstmarksurface[i]] != ent->model->brushq1.pvsframecount)
 239                                 continue;
 240                         surf = ent->model->brushq1.surfaces + leaf->firstmarksurface[i];
 241                         dist = sdist = PlaneDiff(lightorigin, surf->plane);
 242                         if (surf->flags & SURF_PLANEBACK)
 243                                 dist = -dist;
 244
 245                         if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 246                                 continue;
 247
 248                         dist2 = dist * dist;
 249                         if (dist2 >= maxdist)
 250                                 continue;
 251
 252                         VectorCopy(lightorigin, impact);
 253                         if (surf->plane->type >= 3)
 254                                 VectorMA(impact, -sdist, surf->plane->normal, impact);
 255                         else
 256                                 impact[surf->plane->type] -= sdist;
 257
 258                         impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 259
 260                         d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 261                         dist2 += d * d;
 262                         if (dist2 > maxdist)
 263                                 continue;
 264
 265                         impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 266
 267                         d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 268                         dist2 += d * d;
 269                         if (dist2 > maxdist)
 270                                 continue;
 271
 272                         if (surf->dlightframe != r_framecount) // not dynamic until now
 273                         {
 274                                 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;
 275                                 surf->dlightframe = r_framecount;
 276                                 surf->cached_dlight = true;
 277                         }
 278                         surf->dlightbits[bitindex] |= bit;
 279                 }
 280         }
 281 }
 282
 283 void R_MarkLights(entity_render_t *ent)
 284 {
 285         int i, bit, bitindex;
 286         rdlight_t *rd;
 287         vec3_t lightorigin;
 288         if (!gl_flashblend.integer && r_dynamic.integer && ent->model && ent->model->brushq1.numleafs)
 289         {
 290                 for (i = 0, rd = r_dlight;i < r_numdlights;i++, rd++)
 291                 {
 292                         bit = 1 << (i & 31);
 293                         bitindex = i >> 5;
 294                         Matrix4x4_Transform(&ent->inversematrix, rd->origin, lightorigin);
 295                         lightpvsbytes = 0;
 296                         if (r_vismarklights.integer && ent->model->brush.FatPVS)
 297                                 lightpvsbytes = ent->model->brush.FatPVS(ent->model, lightorigin, 0, lightpvs, sizeof(lightpvs));
 298                         R_RecursiveMarkLights(ent, lightorigin, rd, bit, bitindex, ent->model->brushq1.nodes + ent->model->brushq1.hulls[0].firstclipnode, lightpvs, min(lightpvsbytes * 8, ent->model->brushq1.visleafs));
 299                 }
 300         }
 301 }
 302
 303 /*
 304 =============================================================================
 305
 306 LIGHT SAMPLING
 307
 308 =============================================================================
 309 */
 310
 311 void R_CompleteLightPoint(vec3_t ambientcolor, vec3_t diffusecolor, vec3_t diffusenormal, const vec3_t p, int dynamic, const mleaf_t *leaf)
 312 {
 313         VectorClear(diffusecolor);
 314         VectorClear(diffusenormal);
 315
 316         if (!r_fullbright.integer && cl.worldmodel && cl.worldmodel->brush.LightPoint)
 317         {
 318                 ambientcolor[0] = ambientcolor[1] = ambientcolor[2] = r_ambient.value * (2.0f / 128.0f);
 319                 cl.worldmodel->brush.LightPoint(cl.worldmodel, p, ambientcolor, diffusecolor, diffusenormal);
 320         }
 321         else
 322                 VectorSet(ambientcolor, 1, 1, 1);
 323
 324         // FIXME: this .lights related stuff needs to be ported into the Mod_Q1BSP code
 325         if (cl.worldmodel->brushq1.numlights)
 326         {
 327                 int i;
 328                 vec3_t v;
 329                 float f;
 330                 mlight_t *sl;
 331                 for (i = 0;i < cl.worldmodel->brushq1.numlights;i++)
 332                 {
 333                         sl = cl.worldmodel->brushq1.lights + i;
 334                         if (d_lightstylevalue[sl->style] > 0)
 335                         {
 336                                 VectorSubtract (p, sl->origin, v);
 337                                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract);
 338                                 if (f > 0 && CL_TraceLine(p, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 339                                 {
 340                                         f *= d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 341                                         VectorMA(ambientcolor, f, sl->light, ambientcolor);
 342                                 }
 343                         }
 344                 }
 345         }
 346
 347         if (dynamic)
 348         {
 349                 int i;
 350                 float f, v[3];
 351                 rdlight_t *rd;
 352                 // FIXME: this really should handle dlights as diffusecolor/diffusenormal somehow
 353                 for (i = 0;i < r_numdlights;i++)
 354                 {
 355                         rd = r_dlight + i;
 356                         VectorSubtract(p, rd->origin, v);
 357                         f = DotProduct(v, v);
 358                         if (f < rd->cullradius2 && CL_TraceLine(p, rd->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 359                         {
 360                                 f = (1.0f / (f + LIGHTOFFSET)) - rd->subtract;
 361                                 VectorMA(ambientcolor, f, rd->light, ambientcolor);
 362                         }
 363                 }
 364         }
 365 }
 366
 367 typedef struct
 368 {
 369         vec3_t origin;
 370         //vec_t cullradius2;
 371         vec3_t light;
 372         // how much this light would contribute to ambient if replaced
 373         vec3_t ambientlight;
 374         vec_t subtract;
 375         vec_t falloff;
 376         vec_t offset;
 377         // used for choosing only the brightest lights
 378         vec_t intensity;
 379 }
 380 nearlight_t;
 381
 382 static int nearlights;
 383 static nearlight_t nearlight[MAX_DLIGHTS];
 384
 385 int R_LightModel(float *ambient4f, float *diffusecolor, float *diffusenormal, const entity_render_t *ent, float colorr, float colorg, float colorb, float colora, int worldcoords)
 386 {
 387         int i, j, maxnearlights;
 388         float v[3], f, mscale, stylescale, intensity, ambientcolor[3], tempdiffusenormal[3];
 389         nearlight_t *nl;
 390         mlight_t *sl;
 391         rdlight_t *rd;
 392
 393         nearlights = 0;
 394         maxnearlights = r_modellights.integer;
 395         ambient4f[0] = ambient4f[1] = ambient4f[2] = r_ambient.value * (2.0f / 128.0f);
 396         VectorClear(diffusecolor);
 397         VectorClear(diffusenormal);
 398         if (r_fullbright.integer || (ent->effects & EF_FULLBRIGHT))
 399         {
 400                 // highly rare
 401                 VectorSet(ambient4f, 1, 1, 1);
 402                 maxnearlights = 0;
 403         }
 404         else if (r_shadow_realtime_world.integer && r_shadow_realtime_world_lightmaps.value <= 0)
 405                 maxnearlights = 0;
 406         else
 407         {
 408                 if (cl.worldmodel && cl.worldmodel->brush.LightPoint)
 409                 {
 410                         cl.worldmodel->brush.LightPoint(cl.worldmodel, ent->origin, ambient4f, diffusecolor, tempdiffusenormal);
 411                         Matrix4x4_Transform3x3(&ent->inversematrix, tempdiffusenormal, diffusenormal);
 412                         VectorNormalize(diffusenormal);
 413                 }
 414                 else
 415                         VectorSet(ambient4f, 1, 1, 1);
 416         }
 417
 418         // scale of the model's coordinate space, to alter light attenuation to match
 419         // make the mscale squared so it can scale the squared distance results
 420         mscale = ent->scale * ent->scale;
 421         // FIXME: no support for .lights on non-Q1BSP?
 422         nl = &nearlight[0];
 423         for (i = 0;i < ent->numentlights;i++)
 424         {
 425                 sl = cl.worldmodel->brushq1.lights + ent->entlights[i];
 426                 stylescale = d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 427                 VectorSubtract (ent->origin, sl->origin, v);
 428                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract) * stylescale;
 429                 VectorScale(sl->light, f, ambientcolor);
 430                 intensity = DotProduct(ambientcolor, ambientcolor);
 431                 if (f < 0)
 432                         intensity *= -1.0f;
 433                 if (nearlights < maxnearlights)
 434                         j = nearlights++;
 435                 else
 436                 {
 437                         for (j = 0;j < maxnearlights;j++)
 438                         {
 439                                 if (nearlight[j].intensity < intensity)
 440                                 {
 441                                         if (nearlight[j].intensity > 0)
 442                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 443                                         break;
 444                                 }
 445                         }
 446                 }
 447                 if (j >= maxnearlights)
 448                 {
 449                         // this light is less significant than all others,
 450                         // add it to ambient
 451                         if (intensity > 0)
 452                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 453                 }
 454                 else
 455                 {
 456                         nl = nearlight + j;
 457                         nl->intensity = intensity;
 458                         // transform the light into the model's coordinate system
 459                         if (worldcoords)
 460                                 VectorCopy(sl->origin, nl->origin);
 461                         else
 462                                 Matrix4x4_Transform(&ent->inversematrix, sl->origin, nl->origin);
 463                         // integrate mscale into falloff, for maximum speed
 464                         nl->falloff = sl->falloff * mscale;
 465                         VectorCopy(ambientcolor, nl->ambientlight);
 466                         nl->light[0] = sl->light[0] * stylescale * colorr * 4.0f;
 467                         nl->light[1] = sl->light[1] * stylescale * colorg * 4.0f;
 468                         nl->light[2] = sl->light[2] * stylescale * colorb * 4.0f;
 469                         nl->subtract = sl->subtract;
 470                         nl->offset = sl->distbias;
 471                 }
 472         }
 473         if (!r_shadow_realtime_dlight.integer)
 474         {
 475                 for (i = 0;i < r_numdlights;i++)
 476                 {
 477                         rd = r_dlight + i;
 478                         VectorCopy(rd->origin, v);
 479                         if (v[0] < ent->mins[0]) v[0] = ent->mins[0];if (v[0] > ent->maxs[0]) v[0] = ent->maxs[0];
 480                         if (v[1] < ent->mins[1]) v[1] = ent->mins[1];if (v[1] > ent->maxs[1]) v[1] = ent->maxs[1];
 481                         if (v[2] < ent->mins[2]) v[2] = ent->mins[2];if (v[2] > ent->maxs[2]) v[2] = ent->maxs[2];
 482                         VectorSubtract (v, rd->origin, v);
 483                         if (DotProduct(v, v) < rd->cullradius2)
 484                         {
 485                                 if (CL_TraceLine(ent->origin, rd->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) != 1)
 486                                         continue;
 487                                 VectorSubtract (ent->origin, rd->origin, v);
 488                                 f = ((1.0f / (DotProduct(v, v) + LIGHTOFFSET)) - rd->subtract);
 489                                 VectorScale(rd->light, f, ambientcolor);
 490                                 intensity = DotProduct(ambientcolor, ambientcolor);
 491                                 if (f < 0)
 492                                         intensity *= -1.0f;
 493                                 if (nearlights < maxnearlights)
 494                                         j = nearlights++;
 495                                 else
 496                                 {
 497                                         for (j = 0;j < maxnearlights;j++)
 498                                         {
 499                                                 if (nearlight[j].intensity < intensity)
 500                                                 {
 501                                                         if (nearlight[j].intensity > 0)
 502                                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 503                                                         break;
 504                                                 }
 505                                         }
 506                                 }
 507                                 if (j >= maxnearlights)
 508                                 {
 509                                         // this light is less significant than all others,
 510                                         // add it to ambient
 511                                         if (intensity > 0)
 512                                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 513                                 }
 514                                 else
 515                                 {
 516                                         nl = nearlight + j;
 517                                         nl->intensity = intensity;
 518                                         // transform the light into the model's coordinate system
 519                                         if (worldcoords)
 520                                                 VectorCopy(rd->origin, nl->origin);
 521                                         else
 522                                         {
 523                                                 Matrix4x4_Transform(&ent->inversematrix, rd->origin, nl->origin);
 524                                                 /*
 525                                                 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"
 526                                                 , rd - r_dlight, ent->model->name
 527                                                 , rd->origin[0], rd->origin[1], rd->origin[2]
 528                                                 , nl->origin[0], nl->origin[1], nl->origin[2]
 529                                                 , ent->inversematrix.m[0][0], ent->inversematrix.m[0][1], ent->inversematrix.m[0][2], ent->inversematrix.m[0][3]
 530                                                 , ent->inversematrix.m[1][0], ent->inversematrix.m[1][1], ent->inversematrix.m[1][2], ent->inversematrix.m[1][3]
 531                                                 , ent->inversematrix.m[2][0], ent->inversematrix.m[2][1], ent->inversematrix.m[2][2], ent->inversematrix.m[2][3]
 532                                                 , ent->inversematrix.m[3][0], ent->inversematrix.m[3][1], ent->inversematrix.m[3][2], ent->inversematrix.m[3][3]);
 533                                                 */
 534                                         }
 535                                         // integrate mscale into falloff, for maximum speed
 536                                         nl->falloff = mscale;
 537                                         VectorCopy(ambientcolor, nl->ambientlight);
 538                                         nl->light[0] = rd->light[0] * colorr * 4.0f;
 539                                         nl->light[1] = rd->light[1] * colorg * 4.0f;
 540                                         nl->light[2] = rd->light[2] * colorb * 4.0f;
 541                                         nl->subtract = rd->subtract;
 542                                         nl->offset = LIGHTOFFSET;
 543                                 }
 544                         }
 545                 }
 546         }
 547         ambient4f[0] *= colorr;
 548         ambient4f[1] *= colorg;
 549         ambient4f[2] *= colorb;
 550         ambient4f[3] = colora;
 551         diffusecolor[0] *= colorr;
 552         diffusecolor[1] *= colorg;
 553         diffusecolor[2] *= colorb;
 554         return nearlights != 0 || DotProduct(diffusecolor, diffusecolor) > 0;
 555 }
 556
 557 void R_LightModel_CalcVertexColors(const float *ambientcolor4f, const float *diffusecolor, const float *diffusenormal, int numverts, const float *vertex3f, const float *normal3f, float *color4f)
 558 {
 559         int i, j, usediffuse;
 560         float color[4], v[3], dot, dist2, f, dnormal[3];
 561         nearlight_t *nl;
 562         usediffuse = DotProduct(diffusecolor, diffusecolor) > 0;
 563         // negate the diffuse normal to avoid the need to negate the
 564         // dotproduct on each vertex
 565         VectorNegate(diffusenormal, dnormal);
 566         if (usediffuse)
 567                 VectorNormalize(dnormal);
 568         // directional shading code here
 569         for (i = 0;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
 570         {
 571                 VectorCopy4(ambientcolor4f, color);
 572
 573                 // silly directional diffuse shading
 574                 if (usediffuse)
 575                 {
 576                         dot = DotProduct(normal3f, dnormal);
 577                         if (dot > 0)
 578                                 VectorMA(color, dot, diffusecolor, color);
 579                 }
 580
 581                 // pretty good lighting
 582                 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 583                 {
 584                         VectorSubtract(vertex3f, nl->origin, v);
 585                         // first eliminate negative lighting (back side)
 586                         dot = DotProduct(normal3f, v);
 587                         if (dot > 0)
 588                         {
 589                                 // we'll need this again later to normalize the dotproduct
 590                                 dist2 = DotProduct(v,v);
 591                                 // do the distance attenuation math
 592                                 f = (1.0f / (dist2 * nl->falloff + nl->offset)) - nl->subtract;
 593                                 if (f > 0)
 594                                 {
 595                                         // we must divide dot by sqrt(dist2) to compensate for
 596                                         // the fact we did not normalize v before doing the
 597                                         // dotproduct, the result is in the range 0 to 1 (we
 598                                         // eliminated negative numbers already)
 599                                         f *= dot / sqrt(dist2);
 600                                         // blend in the lighting
 601                                         VectorMA(color, f, nl->light, color);
 602                                 }
 603                         }
 604                 }
 605                 VectorCopy4(color, color4f);
 606         }
 607 }
 608
 609 void R_UpdateEntLights(entity_render_t *ent)
 610 {
 611         int i;
 612         const mlight_t *sl;
 613         vec3_t v;
 614         if (r_shadow_realtime_world.integer && r_shadow_realtime_world_lightmaps.value <= 0)
 615                 return;
 616         VectorSubtract(ent->origin, ent->entlightsorigin, v);
 617         if (ent->entlightsframe != (r_framecount - 1) || (realtime > ent->entlightstime && DotProduct(v,v) >= 1.0f))
 618         {
 619                 ent->entlightstime = realtime + 0.1;
 620                 VectorCopy(ent->origin, ent->entlightsorigin);
 621                 ent->numentlights = 0;
 622                 if (cl.worldmodel)
 623                         for (i = 0, sl = cl.worldmodel->brushq1.lights;i < cl.worldmodel->brushq1.numlights && ent->numentlights < MAXENTLIGHTS;i++, sl++)
 624                                 if (CL_TraceLine(ent->origin, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 625                                         ent->entlights[ent->numentlights++] = i;
 626         }
 627         ent->entlightsframe = r_framecount;
 628 }
 629