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         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;
 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         if (r_rtworld)
 139         {
 140                 for (lnum = 0, light = r_shadow_worldlightchain;light;light = light->next, lnum++)
 141                 {
 142                         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)
 143                         {
 144                                 cscale = light->rtlight.corona * r_coronas.value * 0.25f;
 145                                 scale = light->rtlight.radius * 0.25f;
 146                                 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);
 147                         }
 148                 }
 149         }
 150         for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 151         {
 152                 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)
 153                 {
 154                         cscale = light->corona * r_coronas.value * 0.25f;
 155                         scale = light->radius * 0.25f;
 156                         if (gl_flashblend.integer)
 157                         {
 158                                 cscale *= 4.0f;
 159                                 scale *= 2.0f;
 160                         }
 161                         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);
 162                 }
 163         }
 164 }
 165
 166 /*
 167 =============================================================================
 168
 169 DYNAMIC LIGHTS
 170
 171 =============================================================================
 172 */
 173
 174 static int lightpvsbytes;
 175 static qbyte lightpvs[(MAX_MAP_LEAFS+7)>>3];
 176
 177 /*
 178 =============
 179 R_MarkLights
 180 =============
 181 */
 182 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)
 183 {
 184         int i;
 185         mleaf_t *leaf;
 186         float dist;
 187
 188         // for comparisons to minimum acceptable light
 189         while(node->contents >= 0)
 190         {
 191                 dist = PlaneDiff(lightorigin, node->plane);
 192                 if (dist > light->rtlight.lightmap_cullradius)
 193                         node = node->children[0];
 194                 else
 195                 {
 196                         if (dist >= -light->rtlight.lightmap_cullradius)
 197                                 R_RecursiveMarkLights(ent, lightorigin, light, bit, bitindex, node->children[0], pvs, pvsbits);
 198                         node = node->children[1];
 199                 }
 200         }
 201
 202         // check if leaf is visible according to pvs
 203         leaf = (mleaf_t *)node;
 204         i = leaf->clusterindex;
 205         if (leaf->nummarksurfaces && (i >= pvsbits || CHECKPVSBIT(pvs, i)))
 206         {
 207                 int *surfacepvsframes, d, impacts, impactt;
 208                 float sdist, maxdist, dist2, impact[3];
 209                 msurface_t *surf;
 210                 // mark the polygons
 211                 maxdist = light->rtlight.lightmap_cullradius2;
 212                 surfacepvsframes = ent->model->brushq1.surfacepvsframes;
 213                 for (i = 0;i < leaf->nummarksurfaces;i++)
 214                 {
 215                         if (surfacepvsframes[leaf->firstmarksurface[i]] != ent->model->brushq1.pvsframecount)
 216                                 continue;
 217                         surf = ent->model->brushq1.surfaces + leaf->firstmarksurface[i];
 218                         dist = sdist = PlaneDiff(lightorigin, surf->plane);
 219                         if (surf->flags & SURF_PLANEBACK)
 220                                 dist = -dist;
 221
 222                         if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
 223                                 continue;
 224
 225                         dist2 = dist * dist;
 226                         if (dist2 >= maxdist)
 227                                 continue;
 228
 229                         VectorCopy(lightorigin, impact);
 230                         if (surf->plane->type >= 3)
 231                                 VectorMA(impact, -sdist, surf->plane->normal, impact);
 232                         else
 233                                 impact[surf->plane->type] -= sdist;
 234
 235                         impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 236
 237                         d = bound(0, impacts, surf->extents[0] + 16) - impacts;
 238                         dist2 += d * d;
 239                         if (dist2 > maxdist)
 240                                 continue;
 241
 242                         impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 243
 244                         d = bound(0, impactt, surf->extents[1] + 16) - impactt;
 245                         dist2 += d * d;
 246                         if (dist2 > maxdist)
 247                                 continue;
 248
 249                         if (surf->dlightframe != r_framecount) // not dynamic until now
 250                         {
 251                                 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;
 252                                 surf->dlightframe = r_framecount;
 253                                 surf->cached_dlight = true;
 254                         }
 255                         surf->dlightbits[bitindex] |= bit;
 256                 }
 257         }
 258 }
 259
 260 void R_MarkLights(entity_render_t *ent)
 261 {
 262         int i, bit, bitindex;
 263         dlight_t *light;
 264         vec3_t lightorigin;
 265         if (!gl_flashblend.integer && r_dynamic.integer && ent->model && ent->model->brushq1.num_leafs)
 266         {
 267                 for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 268                 {
 269                         bit = 1 << (i & 31);
 270                         bitindex = i >> 5;
 271                         Matrix4x4_Transform(&ent->inversematrix, light->origin, lightorigin);
 272                         lightpvsbytes = 0;
 273                         if (r_vismarklights.integer && ent->model->brush.FatPVS)
 274                                 lightpvsbytes = ent->model->brush.FatPVS(ent->model, lightorigin, 0, lightpvs, sizeof(lightpvs));
 275                         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));
 276                 }
 277         }
 278 }
 279
 280 /*
 281 =============================================================================
 282
 283 LIGHT SAMPLING
 284
 285 =============================================================================
 286 */
 287
 288 void R_CompleteLightPoint(vec3_t ambientcolor, vec3_t diffusecolor, vec3_t diffusenormal, const vec3_t p, int dynamic, const mleaf_t *leaf)
 289 {
 290         VectorClear(diffusecolor);
 291         VectorClear(diffusenormal);
 292
 293         if (!r_fullbright.integer && cl.worldmodel && cl.worldmodel->brush.LightPoint)
 294         {
 295                 ambientcolor[0] = ambientcolor[1] = ambientcolor[2] = r_ambient.value * (2.0f / 128.0f);
 296                 cl.worldmodel->brush.LightPoint(cl.worldmodel, p, ambientcolor, diffusecolor, diffusenormal);
 297         }
 298         else
 299                 VectorSet(ambientcolor, 1, 1, 1);
 300
 301         // FIXME: this .lights related stuff needs to be ported into the Mod_Q1BSP code
 302         if (cl.worldmodel->brushq1.numlights)
 303         {
 304                 int i;
 305                 vec3_t v;
 306                 float f;
 307                 mlight_t *sl;
 308                 for (i = 0;i < cl.worldmodel->brushq1.numlights;i++)
 309                 {
 310                         sl = cl.worldmodel->brushq1.lights + i;
 311                         if (d_lightstylevalue[sl->style] > 0)
 312                         {
 313                                 VectorSubtract (p, sl->origin, v);
 314                                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract);
 315                                 if (f > 0 && CL_TraceLine(p, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 316                                 {
 317                                         f *= d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 318                                         VectorMA(ambientcolor, f, sl->light, ambientcolor);
 319                                 }
 320                         }
 321                 }
 322         }
 323
 324         if (dynamic)
 325         {
 326                 int i;
 327                 float f, v[3];
 328                 dlight_t *light;
 329                 // FIXME: this really should handle dlights as diffusecolor/diffusenormal somehow
 330                 for (i = 0;i < r_numdlights;i++)
 331                 {
 332                         light = r_dlight + i;
 333                         VectorSubtract(p, light->origin, v);
 334                         f = DotProduct(v, v);
 335                         if (f < light->rtlight.lightmap_cullradius2 && CL_TraceLine(p, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 336                         {
 337                                 f = (1.0f / (f + LIGHTOFFSET)) - light->rtlight.lightmap_subtract;
 338                                 VectorMA(ambientcolor, f, light->rtlight.lightmap_light, ambientcolor);
 339                         }
 340                 }
 341         }
 342 }
 343
 344 typedef struct
 345 {
 346         vec3_t origin;
 347         //vec_t cullradius2;
 348         vec3_t light;
 349         // how much this light would contribute to ambient if replaced
 350         vec3_t ambientlight;
 351         vec_t subtract;
 352         vec_t falloff;
 353         vec_t offset;
 354         // used for choosing only the brightest lights
 355         vec_t intensity;
 356 }
 357 nearlight_t;
 358
 359 static int nearlights;
 360 static nearlight_t nearlight[MAX_DLIGHTS];
 361
 362 int R_LightModel(float *ambient4f, float *diffusecolor, float *diffusenormal, const entity_render_t *ent, float colorr, float colorg, float colorb, float colora, int worldcoords)
 363 {
 364         int i, j, maxnearlights;
 365         float v[3], f, mscale, stylescale, intensity, ambientcolor[3], tempdiffusenormal[3];
 366         nearlight_t *nl;
 367         mlight_t *sl;
 368         dlight_t *light;
 369
 370         nearlights = 0;
 371         maxnearlights = r_modellights.integer;
 372         ambient4f[0] = ambient4f[1] = ambient4f[2] = r_ambient.value * (2.0f / 128.0f);
 373         VectorClear(diffusecolor);
 374         VectorClear(diffusenormal);
 375         if (!(ent->flags & RENDER_LIGHT))
 376         {
 377                 // highly rare
 378                 VectorSet(ambient4f, 1, 1, 1);
 379                 maxnearlights = 0;
 380         }
 381         else if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 382                 maxnearlights = 0;
 383         else
 384         {
 385                 if (cl.worldmodel && cl.worldmodel->brush.LightPoint)
 386                 {
 387                         cl.worldmodel->brush.LightPoint(cl.worldmodel, ent->origin, ambient4f, diffusecolor, tempdiffusenormal);
 388                         Matrix4x4_Transform3x3(&ent->inversematrix, tempdiffusenormal, diffusenormal);
 389                         VectorNormalize(diffusenormal);
 390                 }
 391                 else
 392                         VectorSet(ambient4f, 1, 1, 1);
 393         }
 394
 395         // scale of the model's coordinate space, to alter light attenuation to match
 396         // make the mscale squared so it can scale the squared distance results
 397         mscale = ent->scale * ent->scale;
 398         // FIXME: no support for .lights on non-Q1BSP?
 399         nl = &nearlight[0];
 400         for (i = 0;i < ent->numentlights;i++)
 401         {
 402                 sl = cl.worldmodel->brushq1.lights + ent->entlights[i];
 403                 stylescale = d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 404                 VectorSubtract (ent->origin, sl->origin, v);
 405                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract) * stylescale;
 406                 VectorScale(sl->light, f, ambientcolor);
 407                 intensity = DotProduct(ambientcolor, ambientcolor);
 408                 if (f < 0)
 409                         intensity *= -1.0f;
 410                 if (nearlights < maxnearlights)
 411                         j = nearlights++;
 412                 else
 413                 {
 414                         for (j = 0;j < maxnearlights;j++)
 415                         {
 416                                 if (nearlight[j].intensity < intensity)
 417                                 {
 418                                         if (nearlight[j].intensity > 0)
 419                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 420                                         break;
 421                                 }
 422                         }
 423                 }
 424                 if (j >= maxnearlights)
 425                 {
 426                         // this light is less significant than all others,
 427                         // add it to ambient
 428                         if (intensity > 0)
 429                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 430                 }
 431                 else
 432                 {
 433                         nl = nearlight + j;
 434                         nl->intensity = intensity;
 435                         // transform the light into the model's coordinate system
 436                         if (worldcoords)
 437                                 VectorCopy(sl->origin, nl->origin);
 438                         else
 439                                 Matrix4x4_Transform(&ent->inversematrix, sl->origin, nl->origin);
 440                         // integrate mscale into falloff, for maximum speed
 441                         nl->falloff = sl->falloff * mscale;
 442                         VectorCopy(ambientcolor, nl->ambientlight);
 443                         nl->light[0] = sl->light[0] * stylescale * colorr * 4.0f;
 444                         nl->light[1] = sl->light[1] * stylescale * colorg * 4.0f;
 445                         nl->light[2] = sl->light[2] * stylescale * colorb * 4.0f;
 446                         nl->subtract = sl->subtract;
 447                         nl->offset = sl->distbias;
 448                 }
 449         }
 450         if (!r_rtdlight || (ent->flags & RENDER_TRANSPARENT))
 451         {
 452                 // FIXME: this dlighting doesn't look like rtlights
 453                 for (i = 0;i < r_numdlights;i++)
 454                 {
 455                         light = r_dlight + i;
 456                         VectorCopy(light->origin, v);
 457                         if (v[0] < ent->mins[0]) v[0] = ent->mins[0];if (v[0] > ent->maxs[0]) v[0] = ent->maxs[0];
 458                         if (v[1] < ent->mins[1]) v[1] = ent->mins[1];if (v[1] > ent->maxs[1]) v[1] = ent->maxs[1];
 459                         if (v[2] < ent->mins[2]) v[2] = ent->mins[2];if (v[2] > ent->maxs[2]) v[2] = ent->maxs[2];
 460                         VectorSubtract (v, light->origin, v);
 461                         if (DotProduct(v, v) < light->rtlight.lightmap_cullradius2)
 462                         {
 463                                 if (CL_TraceLine(ent->origin, light->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) != 1)
 464                                         continue;
 465                                 VectorSubtract (ent->origin, light->origin, v);
 466                                 f = ((1.0f / (DotProduct(v, v) + LIGHTOFFSET)) - light->rtlight.lightmap_subtract);
 467                                 VectorScale(light->rtlight.lightmap_light, f, ambientcolor);
 468                                 intensity = DotProduct(ambientcolor, ambientcolor);
 469                                 if (f < 0)
 470                                         intensity *= -1.0f;
 471                                 if (nearlights < maxnearlights)
 472                                         j = nearlights++;
 473                                 else
 474                                 {
 475                                         for (j = 0;j < maxnearlights;j++)
 476                                         {
 477                                                 if (nearlight[j].intensity < intensity)
 478                                                 {
 479                                                         if (nearlight[j].intensity > 0)
 480                                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 481                                                         break;
 482                                                 }
 483                                         }
 484                                 }
 485                                 if (j >= maxnearlights)
 486                                 {
 487                                         // this light is less significant than all others,
 488                                         // add it to ambient
 489                                         if (intensity > 0)
 490                                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 491                                 }
 492                                 else
 493                                 {
 494                                         nl = nearlight + j;
 495                                         nl->intensity = intensity;
 496                                         // transform the light into the model's coordinate system
 497                                         if (worldcoords)
 498                                                 VectorCopy(light->origin, nl->origin);
 499                                         else
 500                                         {
 501                                                 Matrix4x4_Transform(&ent->inversematrix, light->origin, nl->origin);
 502                                                 /*
 503                                                 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"
 504                                                 , rd - r_dlight, ent->model->name
 505                                                 , light->origin[0], light->origin[1], light->origin[2]
 506                                                 , nl->origin[0], nl->origin[1], nl->origin[2]
 507                                                 , ent->inversematrix.m[0][0], ent->inversematrix.m[0][1], ent->inversematrix.m[0][2], ent->inversematrix.m[0][3]
 508                                                 , ent->inversematrix.m[1][0], ent->inversematrix.m[1][1], ent->inversematrix.m[1][2], ent->inversematrix.m[1][3]
 509                                                 , ent->inversematrix.m[2][0], ent->inversematrix.m[2][1], ent->inversematrix.m[2][2], ent->inversematrix.m[2][3]
 510                                                 , ent->inversematrix.m[3][0], ent->inversematrix.m[3][1], ent->inversematrix.m[3][2], ent->inversematrix.m[3][3]);
 511                                                 */
 512                                         }
 513                                         // integrate mscale into falloff, for maximum speed
 514                                         nl->falloff = mscale;
 515                                         VectorCopy(ambientcolor, nl->ambientlight);
 516                                         nl->light[0] = light->rtlight.lightmap_light[0] * colorr * 4.0f;
 517                                         nl->light[1] = light->rtlight.lightmap_light[1] * colorg * 4.0f;
 518                                         nl->light[2] = light->rtlight.lightmap_light[2] * colorb * 4.0f;
 519                                         nl->subtract = light->rtlight.lightmap_subtract;
 520                                         nl->offset = LIGHTOFFSET;
 521                                 }
 522                         }
 523                 }
 524         }
 525         ambient4f[0] *= colorr;
 526         ambient4f[1] *= colorg;
 527         ambient4f[2] *= colorb;
 528         ambient4f[3] = colora;
 529         diffusecolor[0] *= colorr;
 530         diffusecolor[1] *= colorg;
 531         diffusecolor[2] *= colorb;
 532         return nearlights != 0 || DotProduct(diffusecolor, diffusecolor) > 0;
 533 }
 534
 535 void R_LightModel_CalcVertexColors(const float *ambientcolor4f, const float *diffusecolor, const float *diffusenormal, int numverts, const float *vertex3f, const float *normal3f, float *color4f)
 536 {
 537         int i, j, usediffuse;
 538         float color[4], v[3], dot, dist2, f, dnormal[3];
 539         nearlight_t *nl;
 540         usediffuse = DotProduct(diffusecolor, diffusecolor) > 0;
 541         // negate the diffuse normal to avoid the need to negate the
 542         // dotproduct on each vertex
 543         VectorNegate(diffusenormal, dnormal);
 544         if (usediffuse)
 545                 VectorNormalize(dnormal);
 546         // directional shading code here
 547         for (i = 0;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
 548         {
 549                 VectorCopy4(ambientcolor4f, color);
 550
 551                 // silly directional diffuse shading
 552                 if (usediffuse)
 553                 {
 554                         dot = DotProduct(normal3f, dnormal);
 555                         if (dot > 0)
 556                                 VectorMA(color, dot, diffusecolor, color);
 557                 }
 558
 559                 // pretty good lighting
 560                 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 561                 {
 562                         VectorSubtract(nl->origin, vertex3f, v);
 563                         // first eliminate negative lighting (back side)
 564                         dot = DotProduct(normal3f, v);
 565                         if (dot > 0)
 566                         {
 567                                 // we'll need this again later to normalize the dotproduct
 568                                 dist2 = DotProduct(v,v);
 569                                 // do the distance attenuation math
 570                                 f = (1.0f / (dist2 * nl->falloff + nl->offset)) - nl->subtract;
 571                                 if (f > 0)
 572                                 {
 573                                         // we must divide dot by sqrt(dist2) to compensate for
 574                                         // the fact we did not normalize v before doing the
 575                                         // dotproduct, the result is in the range 0 to 1 (we
 576                                         // eliminated negative numbers already)
 577                                         f *= dot / sqrt(dist2);
 578                                         // blend in the lighting
 579                                         VectorMA(color, f, nl->light, color);
 580                                 }
 581                         }
 582                 }
 583                 VectorCopy4(color, color4f);
 584         }
 585 }
 586
 587 void R_UpdateEntLights(entity_render_t *ent)
 588 {
 589         int i;
 590         const mlight_t *sl;
 591         vec3_t v;
 592         if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 593                 return;
 594         VectorSubtract(ent->origin, ent->entlightsorigin, v);
 595         if (ent->entlightsframe != (r_framecount - 1) || (realtime > ent->entlightstime && DotProduct(v,v) >= 1.0f))
 596         {
 597                 ent->entlightstime = realtime + 0.1;
 598                 VectorCopy(ent->origin, ent->entlightsorigin);
 599                 ent->numentlights = 0;
 600                 if (cl.worldmodel)
 601                         for (i = 0, sl = cl.worldmodel->brushq1.lights;i < cl.worldmodel->brushq1.numlights && ent->numentlights < MAXENTLIGHTS;i++, sl++)
 602                                 if (CL_TraceLine(ent->origin, sl->origin, NULL, NULL, false, NULL, SUPERCONTENTS_SOLID) == 1)
 603                                         ent->entlights[ent->numentlights++] = i;
 604         }
 605         ent->entlightsframe = r_framecount;
 606 }
 607