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", "0"};
  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         float frac;
  90         int i, j, k, l;
  91
  92 // light animations
  93 // 'm' is normal light, 'a' is no light, 'z' is double bright
  94         i = (int)(cl.time * 10);
  95         frac = (cl.time * 10) - i;
  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                 l = (i-1) % cl_lightstyle[j].length;
 105                 k = cl_lightstyle[j].map[k] - 'a';
 106                 l = cl_lightstyle[j].map[l] - 'a';
 107                 d_lightstylevalue[j] = ((k*frac)+(l*(1-frac)))*22;
 108         }
 109
 110         r_numdlights = 0;
 111         c_dlights = 0;
 112
 113         if (!r_dynamic.integer || !cl_dlights)
 114                 return;
 115
 116         // TODO: optimize to not scan whole cl_dlights array if possible
 117         for (i = 0;i < MAX_DLIGHTS;i++)
 118         {
 119                 if (cl_dlights[i].radius > 0)
 120                 {
 121                         R_RTLight_UpdateFromDLight(&cl_dlights[i].rtlight, &cl_dlights[i], false);
 122                         // FIXME: use pointer instead of copy
 123                         r_dlight[r_numdlights++] = cl_dlights[i];
 124                         c_dlights++; // count every dlight in use
 125                 }
 126         }
 127 }
 128
 129 void R_DrawCoronas(void)
 130 {
 131         int i, lnum, flag;
 132         float cscale, scale, viewdist, dist;
 133         dlight_t *light;
 134         if (r_coronas.value < 0.01)
 135                 return;
 136         R_Mesh_Matrix(&r_identitymatrix);
 137         viewdist = DotProduct(r_vieworigin, r_viewforward);
 138         flag = r_rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
 139         for (lnum = 0, light = r_shadow_worldlightchain;light;light = light->next, lnum++)
 140         {
 141                 if ((light->flags & flag) && light->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)
 142                 {
 143                         cscale = light->rtlight.corona * r_coronas.value * 0.25f;
 144                         scale = light->rtlight.radius * light->rtlight.coronasizescale;
 145                         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);
 146                 }
 147         }
 148         for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 149         {
 150                 if ((light->flags & flag) && 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)
 151                 {
 152                         cscale = light->corona * r_coronas.value * 0.25f;
 153                         scale = light->rtlight.radius * light->rtlight.coronasizescale;
 154                         if (gl_flashblend.integer)
 155                         {
 156                                 cscale *= 4.0f;
 157                                 scale *= 2.0f;
 158                         }
 159                         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);
 160                 }
 161         }
 162 }
 163
 164 /*
 165 =============================================================================
 166
 167 DYNAMIC LIGHTS
 168
 169 =============================================================================
 170 */
 171
 172 static int lightpvsbytes;
 173 static qbyte lightpvs[(MAX_MAP_LEAFS+7)>>3];
 174
 175 /*
 176 =============
 177 R_MarkLights
 178 =============
 179 */
 180 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)
 181 {
 182         int i;
 183         mleaf_t *leaf;
 184         float dist;
 185
 186         // for comparisons to minimum acceptable light
 187         while(node->contents >= 0)
 188         {
 189                 dist = PlaneDiff(lightorigin, node->plane);
 190                 if (dist > light->rtlight.lightmap_cullradius)
 191                         node = node->children[0];
 192                 else
 193                 {
 194                         if (dist >= -light->rtlight.lightmap_cullradius)
 195                                 R_RecursiveMarkLights(ent, lightorigin, light, bit, bitindex, node->children[0], pvs, pvsbits);
 196                         node = node->children[1];
 197                 }
 198         }
 199
 200         // check if leaf is visible according to pvs
 201         leaf = (mleaf_t *)node;
 202         i = leaf->clusterindex;
 203         if (leaf->nummarksurfaces && (i >= pvsbits || CHECKPVSBIT(pvs, i)))
 204         {
 205                 int *surfacepvsframes, d, impacts, impactt;
 206                 float sdist, maxdist, dist2, impact[3];
 207                 msurface_t *surf;
 208                 // mark the polygons
 209                 maxdist = light->rtlight.lightmap_cullradius2;
 210                 surfacepvsframes = ent->model->brushq1.surfacepvsframes;
 211                 for (i = 0;i < leaf->nummarksurfaces;i++)
 212                 {
 213                         if (surfacepvsframes[leaf->firstmarksurface[i]] != ent->model->brushq1.pvsframecount)
 214                                 continue;
 215                         surf = ent->model->brushq1.surfaces + leaf->firstmarksurface[i];
 216                         dist = sdist = PlaneDiff(lightorigin, surf->plane);
 217                         if (surf->flags & SURF_PLANEBACK)
 218                                 dist = -dist;
 219
 220                         if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 221                                 continue;
 222
 223                         dist2 = dist * dist;
 224                         if (dist2 >= maxdist)
 225                                 continue;
 226
 227                         VectorCopy(lightorigin, impact);
 228                         if (surf->plane->type >= 3)
 229                                 VectorMA(impact, -sdist, surf->plane->normal, impact);
 230                         else
 231                                 impact[surf->plane->type] -= sdist;
 232
 233                         impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 234
 235                         d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 236                         dist2 += d * d;
 237                         if (dist2 > maxdist)
 238                                 continue;
 239
 240                         impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 241
 242                         d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 243                         dist2 += d * d;
 244                         if (dist2 > maxdist)
 245                                 continue;
 246
 247                         if (surf->dlightframe != r_framecount) // not dynamic until now
 248                         {
 249                                 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;
 250                                 surf->dlightframe = r_framecount;
 251                                 surf->cached_dlight = true;
 252                         }
 253                         surf->dlightbits[bitindex] |= bit;
 254                 }
 255         }
 256 }
 257
 258 void R_MarkLights(entity_render_t *ent)
 259 {
 260         int i, bit, bitindex;
 261         dlight_t *light;
 262         vec3_t lightorigin;
 263         if (!gl_flashblend.integer && r_dynamic.integer && ent->model && ent->model->brushq1.num_leafs)
 264         {
 265                 for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 266                 {
 267                         bit = 1 << (i & 31);
 268                         bitindex = i >> 5;
 269                         Matrix4x4_Transform(&ent->inversematrix, light->origin, lightorigin);
 270                         lightpvsbytes = 0;
 271                         if (r_vismarklights.integer && ent->model->brush.FatPVS)
 272                                 lightpvsbytes = ent->model->brush.FatPVS(ent->model, lightorigin, 0, lightpvs, sizeof(lightpvs));
 273                         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));
 274                 }
 275         }
 276 }
 277
 278 /*
 279 =============================================================================
 280
 281 LIGHT SAMPLING
 282
 283 =============================================================================
 284 */
 285
 286 void R_CompleteLightPoint(vec3_t ambientcolor, vec3_t diffusecolor, vec3_t diffusenormal, const vec3_t p, int dynamic, const mleaf_t *leaf)
 287 {
 288         VectorClear(diffusecolor);
 289         VectorClear(diffusenormal);
 290
 291         if (!r_fullbright.integer && r_refdef.worldmodel && r_refdef.worldmodel->brush.LightPoint)
 292         {
 293                 ambientcolor[0] = ambientcolor[1] = ambientcolor[2] = r_ambient.value * (2.0f / 128.0f);
 294                 r_refdef.worldmodel->brush.LightPoint(r_refdef.worldmodel, p, ambientcolor, diffusecolor, diffusenormal);
 295         }
 296         else
 297                 VectorSet(ambientcolor, 1, 1, 1);
 298
 299         // FIXME: this .lights related stuff needs to be ported into the Mod_Q1BSP code
 300         if (r_refdef.worldmodel->brushq1.numlights)
 301         {
 302                 int i;
 303                 vec3_t v;
 304                 float f;
 305                 mlight_t *sl;
 306                 for (i = 0;i < r_refdef.worldmodel->brushq1.numlights;i++)
 307                 {
 308                         sl = r_refdef.worldmodel->brushq1.lights + i;
 309                         if (d_lightstylevalue[sl->style] > 0)
 310                         {
 311                                 VectorSubtract (p, sl->origin, v);
 312                                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract);
 313                                 if (f > 0 && CL_TraceLine(p, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 314                                 {
 315                                         f *= d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 316                                         VectorMA(ambientcolor, f, sl->light, ambientcolor);
 317                                 }
 318                         }
 319                 }
 320         }
 321
 322         if (dynamic)
 323         {
 324                 int i;
 325                 float f, v[3];
 326                 dlight_t *light;
 327                 // FIXME: this really should handle dlights as diffusecolor/diffusenormal somehow
 328                 for (i = 0;i < r_numdlights;i++)
 329                 {
 330                         light = r_dlight + i;
 331                         VectorSubtract(p, light->origin, v);
 332                         f = DotProduct(v, v);
 333                         if (f < light->rtlight.lightmap_cullradius2 && CL_TraceLine(p, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 334                         {
 335                                 f = (1.0f / (f + LIGHTOFFSET)) - light->rtlight.lightmap_subtract;
 336                                 VectorMA(ambientcolor, f, light->rtlight.lightmap_light, ambientcolor);
 337                         }
 338                 }
 339         }
 340 }
 341
 342 typedef struct
 343 {
 344         vec3_t origin;
 345         //vec_t cullradius2;
 346         vec3_t light;
 347         // how much this light would contribute to ambient if replaced
 348         vec3_t ambientlight;
 349         vec_t subtract;
 350         vec_t falloff;
 351         vec_t offset;
 352         // used for choosing only the brightest lights
 353         vec_t intensity;
 354 }
 355 nearlight_t;
 356
 357 static int nearlights;
 358 static nearlight_t nearlight[MAX_DLIGHTS];
 359
 360 int R_LightModel(float *ambient4f, float *diffusecolor, float *diffusenormal, const entity_render_t *ent, float colorr, float colorg, float colorb, float colora, int worldcoords)
 361 {
 362         int i, j, maxnearlights;
 363         float v[3], f, mscale, stylescale, intensity, ambientcolor[3], tempdiffusenormal[3];
 364         nearlight_t *nl;
 365         mlight_t *sl;
 366         dlight_t *light;
 367
 368         nearlights = 0;
 369         maxnearlights = r_modellights.integer;
 370         ambient4f[0] = ambient4f[1] = ambient4f[2] = r_ambient.value * (2.0f / 128.0f);
 371         VectorClear(diffusecolor);
 372         VectorClear(diffusenormal);
 373         if (!(ent->flags & RENDER_LIGHT))
 374         {
 375                 // highly rare
 376                 VectorSet(ambient4f, 1, 1, 1);
 377                 maxnearlights = 0;
 378         }
 379         else if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 380                 maxnearlights = 0;
 381         else
 382         {
 383                 if (r_refdef.worldmodel && r_refdef.worldmodel->brush.LightPoint)
 384                 {
 385                         r_refdef.worldmodel->brush.LightPoint(r_refdef.worldmodel, ent->origin, ambient4f, diffusecolor, tempdiffusenormal);
 386                         Matrix4x4_Transform3x3(&ent->inversematrix, tempdiffusenormal, diffusenormal);
 387                         VectorNormalize(diffusenormal);
 388                 }
 389                 else
 390                         VectorSet(ambient4f, 1, 1, 1);
 391         }
 392
 393         // scale of the model's coordinate space, to alter light attenuation to match
 394         // make the mscale squared so it can scale the squared distance results
 395         mscale = ent->scale * ent->scale;
 396         // FIXME: no support for .lights on non-Q1BSP?
 397         nl = &nearlight[0];
 398         for (i = 0;i < ent->numentlights;i++)
 399         {
 400                 sl = r_refdef.worldmodel->brushq1.lights + ent->entlights[i];
 401                 stylescale = d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 402                 VectorSubtract (ent->origin, sl->origin, v);
 403                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract) * stylescale;
 404                 VectorScale(sl->light, f, ambientcolor);
 405                 intensity = DotProduct(ambientcolor, ambientcolor);
 406                 if (f < 0)
 407                         intensity *= -1.0f;
 408                 if (nearlights < maxnearlights)
 409                         j = nearlights++;
 410                 else
 411                 {
 412                         for (j = 0;j < maxnearlights;j++)
 413                         {
 414                                 if (nearlight[j].intensity < intensity)
 415                                 {
 416                                         if (nearlight[j].intensity > 0)
 417                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 418                                         break;
 419                                 }
 420                         }
 421                 }
 422                 if (j >= maxnearlights)
 423                 {
 424                         // this light is less significant than all others,
 425                         // add it to ambient
 426                         if (intensity > 0)
 427                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 428                 }
 429                 else
 430                 {
 431                         nl = nearlight + j;
 432                         nl->intensity = intensity;
 433                         // transform the light into the model's coordinate system
 434                         if (worldcoords)
 435                                 VectorCopy(sl->origin, nl->origin);
 436                         else
 437                                 Matrix4x4_Transform(&ent->inversematrix, sl->origin, nl->origin);
 438                         // integrate mscale into falloff, for maximum speed
 439                         nl->falloff = sl->falloff * mscale;
 440                         VectorCopy(ambientcolor, nl->ambientlight);
 441                         nl->light[0] = sl->light[0] * stylescale * colorr * 4.0f;
 442                         nl->light[1] = sl->light[1] * stylescale * colorg * 4.0f;
 443                         nl->light[2] = sl->light[2] * stylescale * colorb * 4.0f;
 444                         nl->subtract = sl->subtract;
 445                         nl->offset = sl->distbias;
 446                 }
 447         }
 448         if (!r_rtdlight || (ent->flags & RENDER_TRANSPARENT))
 449         {
 450                 // FIXME: this dlighting doesn't look like rtlights
 451                 for (i = 0;i < r_numdlights;i++)
 452                 {
 453                         light = r_dlight + i;
 454                         VectorCopy(light->origin, v);
 455                         if (v[0] < ent->mins[0]) v[0] = ent->mins[0];if (v[0] > ent->maxs[0]) v[0] = ent->maxs[0];
 456                         if (v[1] < ent->mins[1]) v[1] = ent->mins[1];if (v[1] > ent->maxs[1]) v[1] = ent->maxs[1];
 457                         if (v[2] < ent->mins[2]) v[2] = ent->mins[2];if (v[2] > ent->maxs[2]) v[2] = ent->maxs[2];
 458                         VectorSubtract (v, light->origin, v);
 459                         if (DotProduct(v, v) < light->rtlight.lightmap_cullradius2)
 460                         {
 461                                 if (CL_TraceLine(ent->origin, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) != 1)
 462                                         continue;
 463                                 VectorSubtract (ent->origin, light->origin, v);
 464                                 f = ((1.0f / (DotProduct(v, v) + LIGHTOFFSET)) - light->rtlight.lightmap_subtract);
 465                                 VectorScale(light->rtlight.lightmap_light, f, ambientcolor);
 466                                 intensity = DotProduct(ambientcolor, ambientcolor);
 467                                 if (f < 0)
 468                                         intensity *= -1.0f;
 469                                 if (nearlights < maxnearlights)
 470                                         j = nearlights++;
 471                                 else
 472                                 {
 473                                         for (j = 0;j < maxnearlights;j++)
 474                                         {
 475                                                 if (nearlight[j].intensity < intensity)
 476                                                 {
 477                                                         if (nearlight[j].intensity > 0)
 478                                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 479                                                         break;
 480                                                 }
 481                                         }
 482                                 }
 483                                 if (j >= maxnearlights)
 484                                 {
 485                                         // this light is less significant than all others,
 486                                         // add it to ambient
 487                                         if (intensity > 0)
 488                                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 489                                 }
 490                                 else
 491                                 {
 492                                         nl = nearlight + j;
 493                                         nl->intensity = intensity;
 494                                         // transform the light into the model's coordinate system
 495                                         if (worldcoords)
 496                                                 VectorCopy(light->origin, nl->origin);
 497                                         else
 498                                         {
 499                                                 Matrix4x4_Transform(&ent->inversematrix, light->origin, nl->origin);
 500                                                 /*
 501                                                 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"
 502                                                 , rd - r_dlight, ent->model->name
 503                                                 , light->origin[0], light->origin[1], light->origin[2]
 504                                                 , nl->origin[0], nl->origin[1], nl->origin[2]
 505                                                 , ent->inversematrix.m[0][0], ent->inversematrix.m[0][1], ent->inversematrix.m[0][2], ent->inversematrix.m[0][3]
 506                                                 , ent->inversematrix.m[1][0], ent->inversematrix.m[1][1], ent->inversematrix.m[1][2], ent->inversematrix.m[1][3]
 507                                                 , ent->inversematrix.m[2][0], ent->inversematrix.m[2][1], ent->inversematrix.m[2][2], ent->inversematrix.m[2][3]
 508                                                 , ent->inversematrix.m[3][0], ent->inversematrix.m[3][1], ent->inversematrix.m[3][2], ent->inversematrix.m[3][3]);
 509                                                 */
 510                                         }
 511                                         // integrate mscale into falloff, for maximum speed
 512                                         nl->falloff = mscale;
 513                                         VectorCopy(ambientcolor, nl->ambientlight);
 514                                         nl->light[0] = light->rtlight.lightmap_light[0] * colorr * 4.0f;
 515                                         nl->light[1] = light->rtlight.lightmap_light[1] * colorg * 4.0f;
 516                                         nl->light[2] = light->rtlight.lightmap_light[2] * colorb * 4.0f;
 517                                         nl->subtract = light->rtlight.lightmap_subtract;
 518                                         nl->offset = LIGHTOFFSET;
 519                                 }
 520                         }
 521                 }
 522         }
 523         ambient4f[0] *= colorr;
 524         ambient4f[1] *= colorg;
 525         ambient4f[2] *= colorb;
 526         ambient4f[3] = colora;
 527         diffusecolor[0] *= colorr;
 528         diffusecolor[1] *= colorg;
 529         diffusecolor[2] *= colorb;
 530         return nearlights != 0 || DotProduct(diffusecolor, diffusecolor) > 0;
 531 }
 532
 533 void R_LightModel_CalcVertexColors(const float *ambientcolor4f, const float *diffusecolor, const float *diffusenormal, int numverts, const float *vertex3f, const float *normal3f, float *color4f)
 534 {
 535         int i, j, usediffuse;
 536         float color[4], v[3], dot, dist2, f, dnormal[3];
 537         nearlight_t *nl;
 538         usediffuse = DotProduct(diffusecolor, diffusecolor) > 0;
 539         // negate the diffuse normal to avoid the need to negate the
 540         // dotproduct on each vertex
 541         VectorNegate(diffusenormal, dnormal);
 542         if (usediffuse)
 543                 VectorNormalize(dnormal);
 544         // directional shading code here
 545         for (i = 0;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
 546         {
 547                 VectorCopy4(ambientcolor4f, color);
 548
 549                 // silly directional diffuse shading
 550                 if (usediffuse)
 551                 {
 552                         dot = DotProduct(normal3f, dnormal);
 553                         if (dot > 0)
 554                                 VectorMA(color, dot, diffusecolor, color);
 555                 }
 556
 557                 // pretty good lighting
 558                 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 559                 {
 560                         VectorSubtract(nl->origin, vertex3f, v);
 561                         // first eliminate negative lighting (back side)
 562                         dot = DotProduct(normal3f, v);
 563                         if (dot > 0)
 564                         {
 565                                 // we'll need this again later to normalize the dotproduct
 566                                 dist2 = DotProduct(v,v);
 567                                 // do the distance attenuation math
 568                                 f = (1.0f / (dist2 * nl->falloff + nl->offset)) - nl->subtract;
 569                                 if (f > 0)
 570                                 {
 571                                         // we must divide dot by sqrt(dist2) to compensate for
 572                                         // the fact we did not normalize v before doing the
 573                                         // dotproduct, the result is in the range 0 to 1 (we
 574                                         // eliminated negative numbers already)
 575                                         f *= dot / sqrt(dist2);
 576                                         // blend in the lighting
 577                                         VectorMA(color, f, nl->light, color);
 578                                 }
 579                         }
 580                 }
 581                 VectorCopy4(color, color4f);
 582         }
 583 }
 584
 585 void R_UpdateEntLights(entity_render_t *ent)
 586 {
 587         int i;
 588         const mlight_t *sl;
 589         vec3_t v;
 590         if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 591                 return;
 592         VectorSubtract(ent->origin, ent->entlightsorigin, v);
 593         if (ent->entlightsframe != (r_framecount - 1) || (realtime > ent->entlightstime && DotProduct(v,v) >= 1.0f))
 594         {
 595                 ent->entlightstime = realtime + 0.1;
 596                 VectorCopy(ent->origin, ent->entlightsorigin);
 597                 ent->numentlights = 0;
 598                 if (r_refdef.worldmodel)
 599                         for (i = 0, sl = r_refdef.worldmodel->brushq1.lights;i < r_refdef.worldmodel->brushq1.numlights && ent->numentlights < MAXENTLIGHTS;i++, sl++)
 600                                 if (CL_TraceLine(ent->origin, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 601                                         ent->entlights[ent->numentlights++] = i;
 602         }
 603         ent->entlightsframe = r_framecount;
 604 }
 605