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 #ifdef LHREMOVESOON
 165 /*
 166 =============================================================================
 167
 168 DYNAMIC LIGHTS
 169
 170 =============================================================================
 171 */
 172
 173 static int lightpvsbytes;
 174 static qbyte lightpvs[(MAX_MAP_LEAFS+7)>>3];
 175
 176 /*
 177 =============
 178 R_MarkLights
 179 =============
 180 */
 181 static void R_RecursiveMarkLights(entity_render_t *ent, vec3_t lightorigin, vec3_t lightmins, vec3_t lightmaxs, dlight_t *light, int bit, int bitindex, mnode_t *node, qbyte *pvs, int pvsbits)
 182 {
 183         int i;
 184         mleaf_t *leaf;
 185         float dist;
 186
 187         // for comparisons to minimum acceptable light
 188         while(node->plane)
 189         {
 190                 dist = PlaneDiff(lightorigin, node->plane);
 191                 if (dist > light->rtlight.lightmap_cullradius)
 192                         node = node->children[0];
 193                 else
 194                 {
 195                         if (dist >= -light->rtlight.lightmap_cullradius)
 196                                 R_RecursiveMarkLights(ent, lightorigin, lightmins, lightmaxs, light, bit, bitindex, node->children[0], pvs, pvsbits);
 197                         node = node->children[1];
 198                 }
 199         }
 200
 201         // check if leaf is visible according to pvs
 202         leaf = (mleaf_t *)node;
 203         i = leaf->clusterindex;
 204         if (leaf->numleafsurfaces && (i >= pvsbits || CHECKPVSBIT(pvs, i)))
 205         {
 206                 int d, impacts, impactt;
 207                 float sdist, maxdist, dist2, impact[3], planenormal[3], planedist;
 208                 msurface_t *surface;
 209                 // mark the polygons
 210                 maxdist = light->rtlight.lightmap_cullradius2;
 211                 for (i = 0;i < leaf->numleafsurfaces;i++)
 212                 {
 213                         // note: this is only called on the worldmodel
 214                         if (r_worldsurfacevisible[leaf->firstleafsurface[i]])
 215                                 continue;
 216                         surface = ent->model->brush.data_surfaces + leaf->firstleafsurface[i];
 217                         if (!BoxesOverlap(surface->mins, surface->maxs, lightmins, lightmaxs))
 218                                 continue;
 219
 220                         // do q1bsp culling checks only if it is a q1bsp surface
 221                         if (surface->samples && surface->texinfo)
 222                         {
 223                                 VectorNegate(surface->mesh.data_normal3f, planenormal);
 224                                 planedist = DotProduct(surface->mesh.data_vertex3f, planenormal);
 225                                 dist = sdist = DotProduct(lightorigin, planenormal) - planedist;
 226
 227                                 if (dist < -0.25f && !(surface->texture->currentmaterialflags & MATERIALFLAG_LIGHTBOTHSIDES))
 228                                         continue;
 229
 230                                 dist2 = dist * dist;
 231                                 if (dist2 >= maxdist)
 232                                         continue;
 233
 234                                 VectorCopy(lightorigin, impact);
 235                                 VectorMA(impact, -sdist, planenormal, impact);
 236
 237                                 impacts = DotProduct (impact, surface->texinfo->vecs[0]) + surface->texinfo->vecs[0][3] - surface->texturemins[0];
 238
 239                                 d = bound(0, impacts, surface->extents[0] + 16) - impacts;
 240                                 dist2 += d * d;
 241                                 if (dist2 > maxdist)
 242                                         continue;
 243
 244                                 impactt = DotProduct (impact, surface->texinfo->vecs[1]) + surface->texinfo->vecs[1][3] - surface->texturemins[1];
 245
 246                                 d = bound(0, impactt, surface->extents[1] + 16) - impactt;
 247                                 dist2 += d * d;
 248                                 if (dist2 > maxdist)
 249                                         continue;
 250                         }
 251
 252                         if (surface->dlightframe != r_framecount) // not dynamic until now
 253                         {
 254                                 surface->dlightbits[0] = surface->dlightbits[1] = surface->dlightbits[2] = surface->dlightbits[3] = surface->dlightbits[4] = surface->dlightbits[5] = surface->dlightbits[6] = surface->dlightbits[7] = 0;
 255                                 surface->dlightframe = r_framecount;
 256                                 surface->cached_dlight = true;
 257                         }
 258                         surface->dlightbits[bitindex] |= bit;
 259                 }
 260         }
 261 }
 262
 263 void R_MarkLights(entity_render_t *ent)
 264 {
 265         int i, j, bit, bitindex;
 266         dlight_t *light;
 267         vec3_t lightorigin, lightmins, lightmaxs;
 268         if (!gl_flashblend.integer && r_dynamic.integer && ent->model && ent->model->brush.num_leafs)
 269         {
 270                 for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 271                 {
 272                         bit = 1 << (i & 31);
 273                         bitindex = i >> 5;
 274                         Matrix4x4_Transform(&ent->inversematrix, light->origin, lightorigin);
 275                         lightmins[0] = lightorigin[0] - light->rtlight.lightmap_cullradius;
 276                         lightmins[1] = lightorigin[1] - light->rtlight.lightmap_cullradius;
 277                         lightmins[2] = lightorigin[2] - light->rtlight.lightmap_cullradius;
 278                         lightmaxs[0] = lightorigin[0] + light->rtlight.lightmap_cullradius;
 279                         lightmaxs[1] = lightorigin[1] + light->rtlight.lightmap_cullradius;
 280                         lightmaxs[2] = lightorigin[2] + light->rtlight.lightmap_cullradius;
 281                         if (ent == r_refdef.worldentity)
 282                         {
 283                                 lightpvsbytes = 0;
 284                                 if (r_vismarklights.integer && ent->model->brush.FatPVS)
 285                                         lightpvsbytes = ent->model->brush.FatPVS(ent->model, lightorigin, 0, lightpvs, sizeof(lightpvs));
 286                                 R_RecursiveMarkLights(ent, lightorigin, lightmins, lightmaxs, light, bit, bitindex, ent->model->brush.data_nodes, lightpvs, min(lightpvsbytes * 8, ent->model->brush.num_pvsclusters));
 287                         }
 288                         else
 289                         {
 290                                 msurface_t *surface;
 291                                 for (j = 0, surface = ent->model->brush.data_surfaces + ent->model->firstmodelsurface;j < ent->model->nummodelsurfaces;j++, surface++)
 292                                 {
 293                                         if (BoxesOverlap(surface->mins, surface->maxs, lightmins, lightmaxs))
 294                                         {
 295                                                 if (surface->dlightframe != r_framecount) // not dynamic until now
 296                                                 {
 297                                                         surface->dlightbits[0] = surface->dlightbits[1] = surface->dlightbits[2] = surface->dlightbits[3] = surface->dlightbits[4] = surface->dlightbits[5] = surface->dlightbits[6] = surface->dlightbits[7] = 0;
 298                                                         surface->dlightframe = r_framecount;
 299                                                         surface->cached_dlight = true;
 300                                                 }
 301                                                 surface->dlightbits[bitindex] |= bit;
 302                                         }
 303                                 }
 304                         }
 305                 }
 306         }
 307 }
 308 #endif
 309
 310 /*
 311 =============================================================================
 312
 313 LIGHT SAMPLING
 314
 315 =============================================================================
 316 */
 317
 318 void R_CompleteLightPoint(vec3_t ambientcolor, vec3_t diffusecolor, vec3_t diffusenormal, const vec3_t p, int dynamic, const mleaf_t *leaf)
 319 {
 320         VectorClear(diffusecolor);
 321         VectorClear(diffusenormal);
 322
 323         if (!r_fullbright.integer && r_refdef.worldmodel && r_refdef.worldmodel->brush.LightPoint)
 324         {
 325                 ambientcolor[0] = ambientcolor[1] = ambientcolor[2] = r_ambient.value * (2.0f / 128.0f);
 326                 r_refdef.worldmodel->brush.LightPoint(r_refdef.worldmodel, p, ambientcolor, diffusecolor, diffusenormal);
 327         }
 328         else
 329                 VectorSet(ambientcolor, 1, 1, 1);
 330
 331         // FIXME: this .lights related stuff needs to be ported into the Mod_Q1BSP code
 332         if (r_refdef.worldmodel->brushq1.numlights)
 333         {
 334                 int i;
 335                 vec3_t v;
 336                 float f;
 337                 mlight_t *sl;
 338                 for (i = 0;i < r_refdef.worldmodel->brushq1.numlights;i++)
 339                 {
 340                         sl = r_refdef.worldmodel->brushq1.lights + i;
 341                         if (d_lightstylevalue[sl->style] > 0)
 342                         {
 343                                 VectorSubtract (p, sl->origin, v);
 344                                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract);
 345                                 if (f > 0 && CL_TraceLine(p, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 346                                 {
 347                                         f *= d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 348                                         VectorMA(ambientcolor, f, sl->light, ambientcolor);
 349                                 }
 350                         }
 351                 }
 352         }
 353
 354         if (dynamic)
 355         {
 356                 int i;
 357                 float f, v[3];
 358                 dlight_t *light;
 359                 // FIXME: this really should handle dlights as diffusecolor/diffusenormal somehow
 360                 for (i = 0;i < r_numdlights;i++)
 361                 {
 362                         light = r_dlight + i;
 363                         VectorSubtract(p, light->origin, v);
 364                         f = DotProduct(v, v);
 365                         if (f < light->rtlight.lightmap_cullradius2 && CL_TraceLine(p, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 366                         {
 367                                 f = (1.0f / (f + LIGHTOFFSET)) - light->rtlight.lightmap_subtract;
 368                                 VectorMA(ambientcolor, f, light->rtlight.lightmap_light, ambientcolor);
 369                         }
 370                 }
 371         }
 372 }
 373
 374 typedef struct
 375 {
 376         vec3_t origin;
 377         //vec_t cullradius2;
 378         vec3_t light;
 379         // how much this light would contribute to ambient if replaced
 380         vec3_t ambientlight;
 381         vec_t subtract;
 382         vec_t falloff;
 383         vec_t offset;
 384         // used for choosing only the brightest lights
 385         vec_t intensity;
 386 }
 387 nearlight_t;
 388
 389 static int nearlights;
 390 static nearlight_t nearlight[MAX_DLIGHTS];
 391
 392 int R_LightModel(float *ambient4f, float *diffusecolor, float *diffusenormal, const entity_render_t *ent, float colorr, float colorg, float colorb, float colora, int worldcoords)
 393 {
 394         int i, j, maxnearlights;
 395         float v[3], f, mscale, stylescale, intensity, ambientcolor[3], tempdiffusenormal[3];
 396         nearlight_t *nl;
 397         mlight_t *sl;
 398         dlight_t *light;
 399
 400         nearlights = 0;
 401         maxnearlights = r_modellights.integer;
 402         ambient4f[0] = ambient4f[1] = ambient4f[2] = r_ambient.value * (2.0f / 128.0f);
 403         VectorClear(diffusecolor);
 404         VectorClear(diffusenormal);
 405         if (!(ent->flags & RENDER_LIGHT))
 406         {
 407                 // highly rare
 408                 VectorSet(ambient4f, 1, 1, 1);
 409                 maxnearlights = 0;
 410         }
 411         else if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 412                 maxnearlights = 0;
 413         else
 414         {
 415                 if (r_refdef.worldmodel && r_refdef.worldmodel->brush.LightPoint)
 416                 {
 417                         r_refdef.worldmodel->brush.LightPoint(r_refdef.worldmodel, ent->origin, ambient4f, diffusecolor, tempdiffusenormal);
 418                         Matrix4x4_Transform3x3(&ent->inversematrix, tempdiffusenormal, diffusenormal);
 419                         VectorNormalize(diffusenormal);
 420                 }
 421                 else
 422                         VectorSet(ambient4f, 1, 1, 1);
 423         }
 424
 425         // scale of the model's coordinate space, to alter light attenuation to match
 426         // make the mscale squared so it can scale the squared distance results
 427         mscale = ent->scale * ent->scale;
 428         // FIXME: no support for .lights on non-Q1BSP?
 429         nl = &nearlight[0];
 430         for (i = 0;i < ent->numentlights;i++)
 431         {
 432                 sl = r_refdef.worldmodel->brushq1.lights + ent->entlights[i];
 433                 stylescale = d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 434                 VectorSubtract (ent->origin, sl->origin, v);
 435                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract) * stylescale;
 436                 VectorScale(sl->light, f, ambientcolor);
 437                 intensity = DotProduct(ambientcolor, ambientcolor);
 438                 if (f < 0)
 439                         intensity *= -1.0f;
 440                 if (nearlights < maxnearlights)
 441                         j = nearlights++;
 442                 else
 443                 {
 444                         for (j = 0;j < maxnearlights;j++)
 445                         {
 446                                 if (nearlight[j].intensity < intensity)
 447                                 {
 448                                         if (nearlight[j].intensity > 0)
 449                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 450                                         break;
 451                                 }
 452                         }
 453                 }
 454                 if (j >= maxnearlights)
 455                 {
 456                         // this light is less significant than all others,
 457                         // add it to ambient
 458                         if (intensity > 0)
 459                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 460                 }
 461                 else
 462                 {
 463                         nl = nearlight + j;
 464                         nl->intensity = intensity;
 465                         // transform the light into the model's coordinate system
 466                         if (worldcoords)
 467                                 VectorCopy(sl->origin, nl->origin);
 468                         else
 469                                 Matrix4x4_Transform(&ent->inversematrix, sl->origin, nl->origin);
 470                         // integrate mscale into falloff, for maximum speed
 471                         nl->falloff = sl->falloff * mscale;
 472                         VectorCopy(ambientcolor, nl->ambientlight);
 473                         nl->light[0] = sl->light[0] * stylescale * colorr * 4.0f;
 474                         nl->light[1] = sl->light[1] * stylescale * colorg * 4.0f;
 475                         nl->light[2] = sl->light[2] * stylescale * colorb * 4.0f;
 476                         nl->subtract = sl->subtract;
 477                         nl->offset = sl->distbias;
 478                 }
 479         }
 480         if (!r_rtdlight || (ent->flags & RENDER_TRANSPARENT))
 481         {
 482                 // FIXME: this dlighting doesn't look like rtlights
 483                 for (i = 0;i < r_numdlights;i++)
 484                 {
 485                         light = r_dlight + i;
 486                         VectorCopy(light->origin, v);
 487                         if (v[0] < ent->mins[0]) v[0] = ent->mins[0];if (v[0] > ent->maxs[0]) v[0] = ent->maxs[0];
 488                         if (v[1] < ent->mins[1]) v[1] = ent->mins[1];if (v[1] > ent->maxs[1]) v[1] = ent->maxs[1];
 489                         if (v[2] < ent->mins[2]) v[2] = ent->mins[2];if (v[2] > ent->maxs[2]) v[2] = ent->maxs[2];
 490                         VectorSubtract (v, light->origin, v);
 491                         if (DotProduct(v, v) < light->rtlight.lightmap_cullradius2)
 492                         {
 493                                 if (CL_TraceLine(ent->origin, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) != 1)
 494                                         continue;
 495                                 VectorSubtract (ent->origin, light->origin, v);
 496                                 f = ((1.0f / (DotProduct(v, v) + LIGHTOFFSET)) - light->rtlight.lightmap_subtract);
 497                                 VectorScale(light->rtlight.lightmap_light, f, ambientcolor);
 498                                 intensity = DotProduct(ambientcolor, ambientcolor);
 499                                 if (f < 0)
 500                                         intensity *= -1.0f;
 501                                 if (nearlights < maxnearlights)
 502                                         j = nearlights++;
 503                                 else
 504                                 {
 505                                         for (j = 0;j < maxnearlights;j++)
 506                                         {
 507                                                 if (nearlight[j].intensity < intensity)
 508                                                 {
 509                                                         if (nearlight[j].intensity > 0)
 510                                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 511                                                         break;
 512                                                 }
 513                                         }
 514                                 }
 515                                 if (j >= maxnearlights)
 516                                 {
 517                                         // this light is less significant than all others,
 518                                         // add it to ambient
 519                                         if (intensity > 0)
 520                                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 521                                 }
 522                                 else
 523                                 {
 524                                         nl = nearlight + j;
 525                                         nl->intensity = intensity;
 526                                         // transform the light into the model's coordinate system
 527                                         if (worldcoords)
 528                                                 VectorCopy(light->origin, nl->origin);
 529                                         else
 530                                         {
 531                                                 Matrix4x4_Transform(&ent->inversematrix, light->origin, nl->origin);
 532                                                 /*
 533                                                 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"
 534                                                 , rd - r_dlight, ent->model->name
 535                                                 , light->origin[0], light->origin[1], light->origin[2]
 536                                                 , nl->origin[0], nl->origin[1], nl->origin[2]
 537                                                 , ent->inversematrix.m[0][0], ent->inversematrix.m[0][1], ent->inversematrix.m[0][2], ent->inversematrix.m[0][3]
 538                                                 , ent->inversematrix.m[1][0], ent->inversematrix.m[1][1], ent->inversematrix.m[1][2], ent->inversematrix.m[1][3]
 539                                                 , ent->inversematrix.m[2][0], ent->inversematrix.m[2][1], ent->inversematrix.m[2][2], ent->inversematrix.m[2][3]
 540                                                 , ent->inversematrix.m[3][0], ent->inversematrix.m[3][1], ent->inversematrix.m[3][2], ent->inversematrix.m[3][3]);
 541                                                 */
 542                                         }
 543                                         // integrate mscale into falloff, for maximum speed
 544                                         nl->falloff = mscale;
 545                                         VectorCopy(ambientcolor, nl->ambientlight);
 546                                         nl->light[0] = light->rtlight.lightmap_light[0] * colorr * 4.0f;
 547                                         nl->light[1] = light->rtlight.lightmap_light[1] * colorg * 4.0f;
 548                                         nl->light[2] = light->rtlight.lightmap_light[2] * colorb * 4.0f;
 549                                         nl->subtract = light->rtlight.lightmap_subtract;
 550                                         nl->offset = LIGHTOFFSET;
 551                                 }
 552                         }
 553                 }
 554         }
 555         ambient4f[0] *= colorr;
 556         ambient4f[1] *= colorg;
 557         ambient4f[2] *= colorb;
 558         ambient4f[3] = colora;
 559         diffusecolor[0] *= colorr;
 560         diffusecolor[1] *= colorg;
 561         diffusecolor[2] *= colorb;
 562         return nearlights != 0 || DotProduct(diffusecolor, diffusecolor) > 0;
 563 }
 564
 565 void R_LightModel_CalcVertexColors(const float *ambientcolor4f, const float *diffusecolor, const float *diffusenormal, int numverts, const float *vertex3f, const float *normal3f, float *color4f)
 566 {
 567         int i, j, usediffuse;
 568         float color[4], v[3], dot, dist2, f, dnormal[3];
 569         nearlight_t *nl;
 570         usediffuse = DotProduct(diffusecolor, diffusecolor) > 0;
 571         // negate the diffuse normal to avoid the need to negate the
 572         // dotproduct on each vertex
 573         VectorNegate(diffusenormal, dnormal);
 574         if (usediffuse)
 575                 VectorNormalize(dnormal);
 576         // directional shading code here
 577         for (i = 0;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
 578         {
 579                 VectorCopy4(ambientcolor4f, color);
 580
 581                 // silly directional diffuse shading
 582                 if (usediffuse)
 583                 {
 584                         dot = DotProduct(normal3f, dnormal);
 585                         if (dot > 0)
 586                                 VectorMA(color, dot, diffusecolor, color);
 587                 }
 588
 589                 // pretty good lighting
 590                 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 591                 {
 592                         VectorSubtract(nl->origin, vertex3f, v);
 593                         // first eliminate negative lighting (back side)
 594                         dot = DotProduct(normal3f, v);
 595                         if (dot > 0)
 596                         {
 597                                 // we'll need this again later to normalize the dotproduct
 598                                 dist2 = DotProduct(v,v);
 599                                 // do the distance attenuation math
 600                                 f = (1.0f / (dist2 * nl->falloff + nl->offset)) - nl->subtract;
 601                                 if (f > 0)
 602                                 {
 603                                         // we must divide dot by sqrt(dist2) to compensate for
 604                                         // the fact we did not normalize v before doing the
 605                                         // dotproduct, the result is in the range 0 to 1 (we
 606                                         // eliminated negative numbers already)
 607                                         f *= dot / sqrt(dist2);
 608                                         // blend in the lighting
 609                                         VectorMA(color, f, nl->light, color);
 610                                 }
 611                         }
 612                 }
 613                 VectorCopy4(color, color4f);
 614         }
 615 }
 616
 617 void R_UpdateEntLights(entity_render_t *ent)
 618 {
 619         int i;
 620         const mlight_t *sl;
 621         vec3_t v;
 622         if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 623                 return;
 624         VectorSubtract(ent->origin, ent->entlightsorigin, v);
 625         if (ent->entlightsframe != (r_framecount - 1) || (realtime > ent->entlightstime && DotProduct(v,v) >= 1.0f))
 626         {
 627                 ent->entlightstime = realtime + 0.1;
 628                 VectorCopy(ent->origin, ent->entlightsorigin);
 629                 ent->numentlights = 0;
 630                 if (r_refdef.worldmodel)
 631                         for (i = 0, sl = r_refdef.worldmodel->brushq1.lights;i < r_refdef.worldmodel->brushq1.numlights && ent->numentlights < MAXENTLIGHTS;i++, sl++)
 632                                 if (CL_TraceLine(ent->origin, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 633                                         ent->entlights[ent->numentlights++] = i;
 634         }
 635         ent->entlightsframe = r_framecount;
 636 }
 637