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 dlight_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
  91 // light animations
  92 // 'm' is normal light, 'a' is no light, 'z' is double bright
  93         i = (int)(cl.time * 10);
  94         for (j = 0;j < MAX_LIGHTSTYLES;j++)
  95         {
  96                 if (!cl_lightstyle || !cl_lightstyle[j].length)
  97                 {
  98                         d_lightstylevalue[j] = 256;
  99                         continue;
 100                 }
 101                 k = i % cl_lightstyle[j].length;
 102                 k = cl_lightstyle[j].map[k] - 'a';
 103                 k = k*22;
 104                 d_lightstylevalue[j] = k;
 105         }
 106
 107         r_numdlights = 0;
 108         c_dlights = 0;
 109
 110         if (!r_dynamic.integer || !cl_dlights)
 111                 return;
 112
 113         // TODO: optimize to not scan whole cl_dlights array if possible
 114         for (i = 0;i < MAX_DLIGHTS;i++)
 115         {
 116                 if (cl_dlights[i].radius > 0)
 117                 {
 118                         R_RTLight_UpdateFromDLight(&cl_dlights[i].rtlight, &cl_dlights[i], false);
 119                         // FIXME: use pointer instead of copy
 120                         r_dlight[r_numdlights++] = cl_dlights[i];
 121                         c_dlights++; // count every dlight in use
 122                 }
 123         }
 124 }
 125
 126 void R_DrawCoronas(void)
 127 {
 128         int i, lnum;
 129         float cscale, scale, viewdist, dist;
 130         dlight_t *light;
 131         if (r_coronas.value < 0.01)
 132                 return;
 133         R_Mesh_Matrix(&r_identitymatrix);
 134         viewdist = DotProduct(r_vieworigin, r_viewforward);
 135         if (r_shadow_realtime_world.integer)
 136         {
 137                 for (lnum = 0, light = r_shadow_worldlightchain;light;light = light->next, lnum++)
 138                 {
 139                         if (light->rtlight.corona * r_coronas.value > 0 && (r_shadow_debuglight.integer < 0 || r_shadow_debuglight.integer == lnum) && (dist = (DotProduct(light->rtlight.shadoworigin, r_viewforward) - viewdist)) >= 24.0f && CL_TraceLine(light->rtlight.shadoworigin, r_vieworigin, NULL, NULL, true, NULL, SUPERCONTENTS_SOLID) == 1)
 140                         {
 141                                 cscale = light->rtlight.corona * r_coronas.value * 0.25f;
 142                                 scale = light->rtlight.radius * 0.25f;
 143                                 R_DrawSprite(GL_ONE, GL_ONE, lightcorona, true, light->rtlight.shadoworigin, r_viewright, r_viewup, scale, -scale, -scale, scale, light->rtlight.color[0] * cscale, light->rtlight.color[1] * cscale, light->rtlight.color[2] * cscale, 1);
 144                         }
 145                 }
 146         }
 147         for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 148         {
 149                 if (light->corona * r_coronas.value > 0 && (dist = (DotProduct(light->origin, r_viewforward) - viewdist)) >= 24.0f && CL_TraceLine(light->origin, r_vieworigin, NULL, NULL, true, NULL, SUPERCONTENTS_SOLID) == 1)
 150                 {
 151                         cscale = light->corona * r_coronas.value * 0.25f;
 152                         scale = light->radius * 0.25f;
 153                         if (gl_flashblend.integer)
 154                         {
 155                                 cscale *= 4.0f;
 156                                 scale *= 2.0f;
 157                         }
 158                         R_DrawSprite(GL_ONE, GL_ONE, lightcorona, true, light->origin, r_viewright, r_viewup, scale, -scale, -scale, scale, light->color[0] * cscale, light->color[1] * cscale, light->color[2] * cscale, 1);
 159                 }
 160         }
 161 }
 162
 163 /*
 164 =============================================================================
 165
 166 DYNAMIC LIGHTS
 167
 168 =============================================================================
 169 */
 170
 171 static int lightpvsbytes;
 172 static qbyte lightpvs[(MAX_MAP_LEAFS+7)>>3];
 173
 174 /*
 175 =============
 176 R_MarkLights
 177 =============
 178 */
 179 static void R_RecursiveMarkLights(entity_render_t *ent, vec3_t lightorigin, dlight_t *light, int bit, int bitindex, mnode_t *node, qbyte *pvs, int pvsbits)
 180 {
 181         int i;
 182         mleaf_t *leaf;
 183         float dist;
 184
 185         // for comparisons to minimum acceptable light
 186         while(node->contents >= 0)
 187         {
 188                 dist = PlaneDiff(lightorigin, node->plane);
 189                 if (dist > light->rtlight.lightmap_cullradius)
 190                         node = node->children[0];
 191                 else
 192                 {
 193                         if (dist >= -light->rtlight.lightmap_cullradius)
 194                                 R_RecursiveMarkLights(ent, lightorigin, light, bit, bitindex, node->children[0], pvs, pvsbits);
 195                         node = node->children[1];
 196                 }
 197         }
 198
 199         // check if leaf is visible according to pvs
 200         leaf = (mleaf_t *)node;
 201         i = leaf->clusterindex;
 202         if (leaf->nummarksurfaces && (i >= pvsbits || CHECKPVSBIT(pvs, i)))
 203         {
 204                 int *surfacepvsframes, d, impacts, impactt;
 205                 float sdist, maxdist, dist2, impact[3];
 206                 msurface_t *surf;
 207                 // mark the polygons
 208                 maxdist = light->rtlight.lightmap_cullradius2;
 209                 surfacepvsframes = ent->model->brushq1.surfacepvsframes;
 210                 for (i = 0;i < leaf->nummarksurfaces;i++)
 211                 {
 212                         if (surfacepvsframes[leaf->firstmarksurface[i]] != ent->model->brushq1.pvsframecount)
 213                                 continue;
 214                         surf = ent->model->brushq1.surfaces + leaf->firstmarksurface[i];
 215                         dist = sdist = PlaneDiff(lightorigin, surf->plane);
 216                         if (surf->flags & SURF_PLANEBACK)
 217                                 dist = -dist;
 218
 219                         if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 220                                 continue;
 221
 222                         dist2 = dist * dist;
 223                         if (dist2 >= maxdist)
 224                                 continue;
 225
 226                         VectorCopy(lightorigin, impact);
 227                         if (surf->plane->type >= 3)
 228                                 VectorMA(impact, -sdist, surf->plane->normal, impact);
 229                         else
 230                                 impact[surf->plane->type] -= sdist;
 231
 232                         impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 233
 234                         d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 235                         dist2 += d * d;
 236                         if (dist2 > maxdist)
 237                                 continue;
 238
 239                         impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 240
 241                         d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 242                         dist2 += d * d;
 243                         if (dist2 > maxdist)
 244                                 continue;
 245
 246                         if (surf->dlightframe != r_framecount) // not dynamic until now
 247                         {
 248                                 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;
 249                                 surf->dlightframe = r_framecount;
 250                                 surf->cached_dlight = true;
 251                         }
 252                         surf->dlightbits[bitindex] |= bit;
 253                 }
 254         }
 255 }
 256
 257 void R_MarkLights(entity_render_t *ent)
 258 {
 259         int i, bit, bitindex;
 260         dlight_t *light;
 261         vec3_t lightorigin;
 262         if (!gl_flashblend.integer && r_dynamic.integer && ent->model && ent->model->brushq1.num_leafs)
 263         {
 264                 for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 265                 {
 266                         bit = 1 << (i & 31);
 267                         bitindex = i >> 5;
 268                         Matrix4x4_Transform(&ent->inversematrix, light->origin, lightorigin);
 269                         lightpvsbytes = 0;
 270                         if (r_vismarklights.integer && ent->model->brush.FatPVS)
 271                                 lightpvsbytes = ent->model->brush.FatPVS(ent->model, lightorigin, 0, lightpvs, sizeof(lightpvs));
 272                         R_RecursiveMarkLights(ent, lightorigin, light, bit, bitindex, ent->model->brushq1.nodes + ent->model->brushq1.hulls[0].firstclipnode, lightpvs, min(lightpvsbytes * 8, ent->model->brush.num_pvsclusters));
 273                 }
 274         }
 275 }
 276
 277 /*
 278 =============================================================================
 279
 280 LIGHT SAMPLING
 281
 282 =============================================================================
 283 */
 284
 285 void R_CompleteLightPoint(vec3_t ambientcolor, vec3_t diffusecolor, vec3_t diffusenormal, const vec3_t p, int dynamic, const mleaf_t *leaf)
 286 {
 287         VectorClear(diffusecolor);
 288         VectorClear(diffusenormal);
 289
 290         if (!r_fullbright.integer && cl.worldmodel && cl.worldmodel->brush.LightPoint)
 291         {
 292                 ambientcolor[0] = ambientcolor[1] = ambientcolor[2] = r_ambient.value * (2.0f / 128.0f);
 293                 cl.worldmodel->brush.LightPoint(cl.worldmodel, p, ambientcolor, diffusecolor, diffusenormal);
 294         }
 295         else
 296                 VectorSet(ambientcolor, 1, 1, 1);
 297
 298         // FIXME: this .lights related stuff needs to be ported into the Mod_Q1BSP code
 299         if (cl.worldmodel->brushq1.numlights)
 300         {
 301                 int i;
 302                 vec3_t v;
 303                 float f;
 304                 mlight_t *sl;
 305                 for (i = 0;i < cl.worldmodel->brushq1.numlights;i++)
 306                 {
 307                         sl = cl.worldmodel->brushq1.lights + i;
 308                         if (d_lightstylevalue[sl->style] > 0)
 309                         {
 310                                 VectorSubtract (p, sl->origin, v);
 311                                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract);
 312                                 if (f > 0 && CL_TraceLine(p, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 313                                 {
 314                                         f *= d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 315                                         VectorMA(ambientcolor, f, sl->light, ambientcolor);
 316                                 }
 317                         }
 318                 }
 319         }
 320
 321         if (dynamic)
 322         {
 323                 int i;
 324                 float f, v[3];
 325                 dlight_t *light;
 326                 // FIXME: this really should handle dlights as diffusecolor/diffusenormal somehow
 327                 for (i = 0;i < r_numdlights;i++)
 328                 {
 329                         light = r_dlight + i;
 330                         VectorSubtract(p, light->origin, v);
 331                         f = DotProduct(v, v);
 332                         if (f < light->rtlight.lightmap_cullradius2 && CL_TraceLine(p, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 333                         {
 334                                 f = (1.0f / (f + LIGHTOFFSET)) - light->rtlight.lightmap_subtract;
 335                                 VectorMA(ambientcolor, f, light->rtlight.lightmap_light, ambientcolor);
 336                         }
 337                 }
 338         }
 339 }
 340
 341 typedef struct
 342 {
 343         vec3_t origin;
 344         //vec_t cullradius2;
 345         vec3_t light;
 346         // how much this light would contribute to ambient if replaced
 347         vec3_t ambientlight;
 348         vec_t subtract;
 349         vec_t falloff;
 350         vec_t offset;
 351         // used for choosing only the brightest lights
 352         vec_t intensity;
 353 }
 354 nearlight_t;
 355
 356 static int nearlights;
 357 static nearlight_t nearlight[MAX_DLIGHTS];
 358
 359 int R_LightModel(float *ambient4f, float *diffusecolor, float *diffusenormal, const entity_render_t *ent, float colorr, float colorg, float colorb, float colora, int worldcoords)
 360 {
 361         int i, j, maxnearlights;
 362         float v[3], f, mscale, stylescale, intensity, ambientcolor[3], tempdiffusenormal[3];
 363         nearlight_t *nl;
 364         mlight_t *sl;
 365         dlight_t *light;
 366
 367         nearlights = 0;
 368         maxnearlights = r_modellights.integer;
 369         ambient4f[0] = ambient4f[1] = ambient4f[2] = r_ambient.value * (2.0f / 128.0f);
 370         VectorClear(diffusecolor);
 371         VectorClear(diffusenormal);
 372         if (r_fullbright.integer || (ent->effects & EF_FULLBRIGHT))
 373         {
 374                 // highly rare
 375                 VectorSet(ambient4f, 1, 1, 1);
 376                 maxnearlights = 0;
 377         }
 378         else if (r_shadow_realtime_world.integer && r_shadow_realtime_world_lightmaps.value <= 0)
 379                 maxnearlights = 0;
 380         else
 381         {
 382                 if (cl.worldmodel && cl.worldmodel->brush.LightPoint)
 383                 {
 384                         cl.worldmodel->brush.LightPoint(cl.worldmodel, ent->origin, ambient4f, diffusecolor, tempdiffusenormal);
 385                         Matrix4x4_Transform3x3(&ent->inversematrix, tempdiffusenormal, diffusenormal);
 386                         VectorNormalize(diffusenormal);
 387                 }
 388                 else
 389                         VectorSet(ambient4f, 1, 1, 1);
 390         }
 391
 392         // scale of the model's coordinate space, to alter light attenuation to match
 393         // make the mscale squared so it can scale the squared distance results
 394         mscale = ent->scale * ent->scale;
 395         // FIXME: no support for .lights on non-Q1BSP?
 396         nl = &nearlight[0];
 397         for (i = 0;i < ent->numentlights;i++)
 398         {
 399                 sl = cl.worldmodel->brushq1.lights + ent->entlights[i];
 400                 stylescale = d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 401                 VectorSubtract (ent->origin, sl->origin, v);
 402                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract) * stylescale;
 403                 VectorScale(sl->light, f, ambientcolor);
 404                 intensity = DotProduct(ambientcolor, ambientcolor);
 405                 if (f < 0)
 406                         intensity *= -1.0f;
 407                 if (nearlights < maxnearlights)
 408                         j = nearlights++;
 409                 else
 410                 {
 411                         for (j = 0;j < maxnearlights;j++)
 412                         {
 413                                 if (nearlight[j].intensity < intensity)
 414                                 {
 415                                         if (nearlight[j].intensity > 0)
 416                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 417                                         break;
 418                                 }
 419                         }
 420                 }
 421                 if (j >= maxnearlights)
 422                 {
 423                         // this light is less significant than all others,
 424                         // add it to ambient
 425                         if (intensity > 0)
 426                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 427                 }
 428                 else
 429                 {
 430                         nl = nearlight + j;
 431                         nl->intensity = intensity;
 432                         // transform the light into the model's coordinate system
 433                         if (worldcoords)
 434                                 VectorCopy(sl->origin, nl->origin);
 435                         else
 436                                 Matrix4x4_Transform(&ent->inversematrix, sl->origin, nl->origin);
 437                         // integrate mscale into falloff, for maximum speed
 438                         nl->falloff = sl->falloff * mscale;
 439                         VectorCopy(ambientcolor, nl->ambientlight);
 440                         nl->light[0] = sl->light[0] * stylescale * colorr * 4.0f;
 441                         nl->light[1] = sl->light[1] * stylescale * colorg * 4.0f;
 442                         nl->light[2] = sl->light[2] * stylescale * colorb * 4.0f;
 443                         nl->subtract = sl->subtract;
 444                         nl->offset = sl->distbias;
 445                 }
 446         }
 447         if (!r_shadow_realtime_dlight.integer)
 448         {
 449                 for (i = 0;i < r_numdlights;i++)
 450                 {
 451                         light = r_dlight + i;
 452                         VectorCopy(light->origin, v);
 453                         if (v[0] < ent->mins[0]) v[0] = ent->mins[0];if (v[0] > ent->maxs[0]) v[0] = ent->maxs[0];
 454                         if (v[1] < ent->mins[1]) v[1] = ent->mins[1];if (v[1] > ent->maxs[1]) v[1] = ent->maxs[1];
 455                         if (v[2] < ent->mins[2]) v[2] = ent->mins[2];if (v[2] > ent->maxs[2]) v[2] = ent->maxs[2];
 456                         VectorSubtract (v, light->origin, v);
 457                         if (DotProduct(v, v) < light->rtlight.lightmap_cullradius2)
 458                         {
 459                                 if (CL_TraceLine(ent->origin, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) != 1)
 460                                         continue;
 461                                 VectorSubtract (ent->origin, light->origin, v);
 462                                 f = ((1.0f / (DotProduct(v, v) + LIGHTOFFSET)) - light->rtlight.lightmap_subtract);
 463                                 VectorScale(light->rtlight.lightmap_light, f, ambientcolor);
 464                                 intensity = DotProduct(ambientcolor, ambientcolor);
 465                                 if (f < 0)
 466                                         intensity *= -1.0f;
 467                                 if (nearlights < maxnearlights)
 468                                         j = nearlights++;
 469                                 else
 470                                 {
 471                                         for (j = 0;j < maxnearlights;j++)
 472                                         {
 473                                                 if (nearlight[j].intensity < intensity)
 474                                                 {
 475                                                         if (nearlight[j].intensity > 0)
 476                                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 477                                                         break;
 478                                                 }
 479                                         }
 480                                 }
 481                                 if (j >= maxnearlights)
 482                                 {
 483                                         // this light is less significant than all others,
 484                                         // add it to ambient
 485                                         if (intensity > 0)
 486                                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 487                                 }
 488                                 else
 489                                 {
 490                                         nl = nearlight + j;
 491                                         nl->intensity = intensity;
 492                                         // transform the light into the model's coordinate system
 493                                         if (worldcoords)
 494                                                 VectorCopy(light->origin, nl->origin);
 495                                         else
 496                                         {
 497                                                 Matrix4x4_Transform(&ent->inversematrix, light->origin, nl->origin);
 498                                                 /*
 499                                                 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"
 500                                                 , rd - r_dlight, ent->model->name
 501                                                 , light->origin[0], light->origin[1], light->origin[2]
 502                                                 , nl->origin[0], nl->origin[1], nl->origin[2]
 503                                                 , ent->inversematrix.m[0][0], ent->inversematrix.m[0][1], ent->inversematrix.m[0][2], ent->inversematrix.m[0][3]
 504                                                 , ent->inversematrix.m[1][0], ent->inversematrix.m[1][1], ent->inversematrix.m[1][2], ent->inversematrix.m[1][3]
 505                                                 , ent->inversematrix.m[2][0], ent->inversematrix.m[2][1], ent->inversematrix.m[2][2], ent->inversematrix.m[2][3]
 506                                                 , ent->inversematrix.m[3][0], ent->inversematrix.m[3][1], ent->inversematrix.m[3][2], ent->inversematrix.m[3][3]);
 507                                                 */
 508                                         }
 509                                         // integrate mscale into falloff, for maximum speed
 510                                         nl->falloff = mscale;
 511                                         VectorCopy(ambientcolor, nl->ambientlight);
 512                                         nl->light[0] = light->rtlight.lightmap_light[0] * colorr * 4.0f;
 513                                         nl->light[1] = light->rtlight.lightmap_light[1] * colorg * 4.0f;
 514                                         nl->light[2] = light->rtlight.lightmap_light[2] * colorb * 4.0f;
 515                                         nl->subtract = light->rtlight.lightmap_subtract;
 516                                         nl->offset = LIGHTOFFSET;
 517                                 }
 518                         }
 519                 }
 520         }
 521         ambient4f[0] *= colorr;
 522         ambient4f[1] *= colorg;
 523         ambient4f[2] *= colorb;
 524         ambient4f[3] = colora;
 525         diffusecolor[0] *= colorr;
 526         diffusecolor[1] *= colorg;
 527         diffusecolor[2] *= colorb;
 528         return nearlights != 0 || DotProduct(diffusecolor, diffusecolor) > 0;
 529 }
 530
 531 void R_LightModel_CalcVertexColors(const float *ambientcolor4f, const float *diffusecolor, const float *diffusenormal, int numverts, const float *vertex3f, const float *normal3f, float *color4f)
 532 {
 533         int i, j, usediffuse;
 534         float color[4], v[3], dot, dist2, f, dnormal[3];
 535         nearlight_t *nl;
 536         usediffuse = DotProduct(diffusecolor, diffusecolor) > 0;
 537         // negate the diffuse normal to avoid the need to negate the
 538         // dotproduct on each vertex
 539         VectorNegate(diffusenormal, dnormal);
 540         if (usediffuse)
 541                 VectorNormalize(dnormal);
 542         // directional shading code here
 543         for (i = 0;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
 544         {
 545                 VectorCopy4(ambientcolor4f, color);
 546
 547                 // silly directional diffuse shading
 548                 if (usediffuse)
 549                 {
 550                         dot = DotProduct(normal3f, dnormal);
 551                         if (dot > 0)
 552                                 VectorMA(color, dot, diffusecolor, color);
 553                 }
 554
 555                 // pretty good lighting
 556                 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 557                 {
 558                         VectorSubtract(vertex3f, nl->origin, v);
 559                         // first eliminate negative lighting (back side)
 560                         dot = DotProduct(normal3f, v);
 561                         if (dot > 0)
 562                         {
 563                                 // we'll need this again later to normalize the dotproduct
 564                                 dist2 = DotProduct(v,v);
 565                                 // do the distance attenuation math
 566                                 f = (1.0f / (dist2 * nl->falloff + nl->offset)) - nl->subtract;
 567                                 if (f > 0)
 568                                 {
 569                                         // we must divide dot by sqrt(dist2) to compensate for
 570                                         // the fact we did not normalize v before doing the
 571                                         // dotproduct, the result is in the range 0 to 1 (we
 572                                         // eliminated negative numbers already)
 573                                         f *= dot / sqrt(dist2);
 574                                         // blend in the lighting
 575                                         VectorMA(color, f, nl->light, color);
 576                                 }
 577                         }
 578                 }
 579                 VectorCopy4(color, color4f);
 580         }
 581 }
 582
 583 void R_UpdateEntLights(entity_render_t *ent)
 584 {
 585         int i;
 586         const mlight_t *sl;
 587         vec3_t v;
 588         if (r_shadow_realtime_world.integer && r_shadow_realtime_world_lightmaps.value <= 0)
 589                 return;
 590         VectorSubtract(ent->origin, ent->entlightsorigin, v);
 591         if (ent->entlightsframe != (r_framecount - 1) || (realtime > ent->entlightstime && DotProduct(v,v) >= 1.0f))
 592         {
 593                 ent->entlightstime = realtime + 0.1;
 594                 VectorCopy(ent->origin, ent->entlightsorigin);
 595                 ent->numentlights = 0;
 596                 if (cl.worldmodel)
 597                         for (i = 0, sl = cl.worldmodel->brushq1.lights;i < cl.worldmodel->brushq1.numlights && ent->numentlights < MAXENTLIGHTS;i++, sl++)
 598                                 if (CL_TraceLine(ent->origin, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 599                                         ent->entlights[ent->numentlights++] = i;
 600         }
 601         ent->entlightsframe = r_framecount;
 602 }
 603