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
  24 cvar_t r_lightmodels = {"r_lightmodels", "1"};
  25
  26 void rlight_init()
  27 {
  28         Cvar_RegisterVariable(&r_lightmodels);
  29 }
  30
  31 int     r_dlightframecount;
  32
  33 /*
  34 ==================
  35 R_AnimateLight
  36 ==================
  37 */
  38 void R_AnimateLight (void)
  39 {
  40         int                     i,j,k;
  41
  42 //
  43 // light animations
  44 // 'm' is normal light, 'a' is no light, 'z' is double bright
  45         i = (int)(cl.time*10);
  46         for (j=0 ; j<MAX_LIGHTSTYLES ; j++)
  47         {
  48                 if (!cl_lightstyle[j].length)
  49                 {
  50                         d_lightstylevalue[j] = 256;
  51                         continue;
  52                 }
  53                 k = i % cl_lightstyle[j].length;
  54                 k = cl_lightstyle[j].map[k] - 'a';
  55                 k = k*22;
  56                 d_lightstylevalue[j] = k;
  57         }
  58 }
  59
  60 /*
  61 =============================================================================
  62
  63 DYNAMIC LIGHTS
  64
  65 =============================================================================
  66 */
  67
  68 /*
  69 =============
  70 R_MarkLights
  71 =============
  72 */
  73 void R_MarkLights (vec3_t lightorigin, dlight_t *light, int bit, int bitindex, mnode_t *node)
  74 {
  75         float           dist, l, maxdist;
  76         msurface_t      *surf;
  77         int                     i, j, s, t;
  78         vec3_t          impact;
  79
  80 loc0:
  81         if (node->contents < 0)
  82                 return;
  83
  84         dist = DotProduct (lightorigin, node->plane->normal) - node->plane->dist;
  85
  86         if (dist > light->radius)
  87         {
  88                 if (node->children[0]->contents >= 0) // LordHavoc: save some time by not pushing another stack frame
  89                 {
  90                         node = node->children[0];
  91                         goto loc0;
  92                 }
  93                 return;
  94         }
  95         if (dist < -light->radius)
  96         {
  97                 if (node->children[1]->contents >= 0) // LordHavoc: save some time by not pushing another stack frame
  98                 {
  99                         node = node->children[1];
 100                         goto loc0;
 101                 }
 102                 return;
 103         }
 104
 105         maxdist = light->radius*light->radius;
 106
 107 // mark the polygons
 108         surf = cl.worldmodel->surfaces + node->firstsurface;
 109         for (i=0 ; i<node->numsurfaces ; i++, surf++)
 110         {
 111                 if (surf->flags & SURF_DRAWTURB) // water
 112                 {
 113                         if (surf->dlightframe != r_dlightframecount) // not dynamic until now
 114                         {
 115                                 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;
 116                                 surf->dlightframe = r_dlightframecount;
 117                         }
 118                         surf->dlightbits[bitindex] |= bit;
 119                 }
 120                 // LordHavoc: MAJOR dynamic light speedup here, eliminates marking of surfaces that are too far away from light, thus preventing unnecessary uploads
 121                 else /*if (r_dynamicbothsides.value || (((surf->flags & SURF_PLANEBACK) && (dist < -BACKFACE_EPSILON)) || (!(surf->flags & SURF_PLANEBACK) && (dist > BACKFACE_EPSILON))))*/
 122                 {
 123                         // passed the plane side check
 124                         for (j=0 ; j<3 ; j++)
 125                                 impact[j] = lightorigin[j] - surf->plane->normal[j]*dist;
 126
 127                         // clamp center of light to corner and check brightness
 128                         l = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
 129                         s = l+0.5;if (s < 0) s = 0;else if (s > surf->extents[0]) s = surf->extents[0];
 130                         s = l - s;
 131                         l = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
 132                         t = l+0.5;if (t < 0) t = 0;else if (t > surf->extents[1]) t = surf->extents[1];
 133                         t = l - t;
 134                         // compare to minimum light
 135                         if ((s*s+t*t+dist*dist) < maxdist)
 136                         {
 137                                 if (surf->dlightframe != r_dlightframecount) // not dynamic until now
 138                                 {
 139                                         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;
 140                                         surf->dlightframe = r_dlightframecount;
 141                                 }
 142                                 surf->dlightbits[bitindex] |= bit;
 143                         }
 144                 }
 145         }
 146
 147         if (node->children[0]->contents >= 0)
 148         {
 149                 if (node->children[1]->contents >= 0)
 150                 {
 151                         R_MarkLights (lightorigin, light, bit, bitindex, node->children[0]);
 152                         node = node->children[1];
 153                         goto loc0;
 154                 }
 155                 else
 156                 {
 157                         node = node->children[0];
 158                         goto loc0;
 159                 }
 160         }
 161         else if (node->children[1]->contents >= 0)
 162         {
 163                 node = node->children[1];
 164                 goto loc0;
 165         }
 166 }
 167
 168
 169 /*
 170 =============
 171 R_PushDlights
 172 =============
 173 */
 174 void R_PushDlights (void)
 175 {
 176         int             i;
 177         dlight_t        *l;
 178
 179         r_dlightframecount = r_framecount + 1;  // because the count hasn't advanced yet for this frame
 180
 181         if (/*gl_flashblend.value ||*/ !r_dynamic.value)
 182                 return;
 183
 184         l = cl_dlights;
 185
 186         for (i=0 ; i<MAX_DLIGHTS ; i++, l++)
 187         {
 188                 if (l->die < cl.time || !l->radius)
 189                         continue;
 190                 R_MarkLights (l->origin, l, 1<<(i&31), i >> 5, cl.worldmodel->nodes );
 191         }
 192 }
 193
 194
 195 /*
 196 =============================================================================
 197
 198 LIGHT SAMPLING
 199
 200 =============================================================================
 201 */
 202
 203 mplane_t                *lightplane;
 204 vec3_t                  lightspot;
 205
 206 extern cvar_t r_ambient;
 207
 208 int RecursiveLightPoint (vec3_t color, mnode_t *node, vec3_t start, vec3_t end)
 209 {
 210         float           front, back, frac;
 211         vec3_t          mid;
 212
 213 loc0:
 214         if (node->contents < 0)
 215                 return false;           // didn't hit anything
 216
 217 // calculate mid point
 218         front = PlaneDiff (start, node->plane);
 219         back = PlaneDiff (end, node->plane);
 220
 221         // LordHavoc: optimized recursion
 222         if ((back < 0) == (front < 0))
 223 //              return RecursiveLightPoint (color, node->children[front < 0], start, end);
 224         {
 225                 node = node->children[front < 0];
 226                 goto loc0;
 227         }
 228
 229         frac = front / (front-back);
 230         mid[0] = start[0] + (end[0] - start[0])*frac;
 231         mid[1] = start[1] + (end[1] - start[1])*frac;
 232         mid[2] = start[2] + (end[2] - start[2])*frac;
 233
 234 // go down front side
 235         if (RecursiveLightPoint (color, node->children[front < 0], start, mid))
 236                 return true;    // hit something
 237         else
 238         {
 239                 int i, ds, dt;
 240                 msurface_t *surf;
 241         // check for impact on this node
 242                 VectorCopy (mid, lightspot);
 243                 lightplane = node->plane;
 244
 245                 surf = cl.worldmodel->surfaces + node->firstsurface;
 246                 for (i = 0;i < node->numsurfaces;i++, surf++)
 247                 {
 248                         if (surf->flags & SURF_DRAWTILED)
 249                                 continue;       // no lightmaps
 250
 251                         ds = (int) ((float) DotProduct (mid, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3]);
 252                         dt = (int) ((float) DotProduct (mid, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3]);
 253
 254                         if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
 255                                 continue;
 256
 257                         ds -= surf->texturemins[0];
 258                         dt -= surf->texturemins[1];
 259
 260                         if (ds > surf->extents[0] || dt > surf->extents[1])
 261                                 continue;
 262
 263                         if (surf->samples)
 264                         {
 265                                 byte *lightmap;
 266                                 int maps, line3, dsfrac = ds & 15, dtfrac = dt & 15, r00 = 0, g00 = 0, b00 = 0, r01 = 0, g01 = 0, b01 = 0, r10 = 0, g10 = 0, b10 = 0, r11 = 0, g11 = 0, b11 = 0;
 267                                 float scale;
 268                                 line3 = ((surf->extents[0]>>4)+1)*3;
 269
 270                                 lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
 271
 272                                 for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
 273                                 {
 274                                         scale = (float) d_lightstylevalue[surf->styles[maps]] * 1.0 / 256.0;
 275                                         r00 += (float) lightmap[      0] * scale;g00 += (float) lightmap[      1] * scale;b00 += (float) lightmap[2] * scale;
 276                                         r01 += (float) lightmap[      3] * scale;g01 += (float) lightmap[      4] * scale;b01 += (float) lightmap[5] * scale;
 277                                         r10 += (float) lightmap[line3+0] * scale;g10 += (float) lightmap[line3+1] * scale;b10 += (float) lightmap[line3+2] * scale;
 278                                         r11 += (float) lightmap[line3+3] * scale;g11 += (float) lightmap[line3+4] * scale;b11 += (float) lightmap[line3+5] * scale;
 279                                         lightmap += ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
 280                                 }
 281
 282                                 color[0] += (float) ((int) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)));
 283                                 color[1] += (float) ((int) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)));
 284                                 color[2] += (float) ((int) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)));
 285                         }
 286                         return true; // success
 287                 }
 288
 289         // go down back side
 290                 return RecursiveLightPoint (color, node->children[front >= 0], mid, end);
 291         }
 292 }
 293
 294 void R_LightPoint (vec3_t color, vec3_t p)
 295 {
 296         vec3_t          end;
 297
 298         if (r_fullbright.value || !cl.worldmodel->lightdata)
 299         {
 300                 color[0] = color[1] = color[2] = 255;
 301                 return;
 302         }
 303
 304         end[0] = p[0];
 305         end[1] = p[1];
 306         end[2] = p[2] - 2048;
 307
 308         color[0] = color[1] = color[2] = r_ambient.value * 2.0f;
 309         RecursiveLightPoint (color, cl.worldmodel->nodes, p, end);
 310 }
 311
 312 // LordHavoc: R_DynamicLightPoint - acumulates the dynamic lighting
 313 void R_DynamicLightPoint(vec3_t color, vec3_t org, int *dlightbits)
 314 {
 315         int             i;
 316         vec3_t  dist;
 317         float   brightness, r, f;
 318
 319         if (/*gl_flashblend.value ||*/ !r_dynamic.value || (!dlightbits[0] && !dlightbits[1] && !dlightbits[2] && !dlightbits[3] && !dlightbits[4] && !dlightbits[5] && !dlightbits[6] && !dlightbits[7]))
 320                 return;
 321
 322         for (i=0 ; i<MAX_DLIGHTS ; i++)
 323         {
 324                 if (!((1 << (i&31)) & dlightbits[i>>5]))
 325                         continue;
 326                 if (cl_dlights[i].die < cl.time || !cl_dlights[i].radius)
 327                         continue;
 328                 VectorSubtract (org, cl_dlights[i].origin, dist);
 329                 if ((f = DotProduct(dist, dist) + 64.0) < (r = cl_dlights[i].radius*cl_dlights[i].radius))
 330                 {
 331                         brightness = r * 16.0 / f;
 332                         if (cl_dlights[i].dark)
 333                                 brightness = -brightness;
 334                         color[0] += brightness * cl_dlights[i].color[0];
 335                         color[1] += brightness * cl_dlights[i].color[1];
 336                         color[2] += brightness * cl_dlights[i].color[2];
 337                 }
 338         }
 339 }
 340
 341 // same as above but no bitmask to check
 342 void R_DynamicLightPointNoMask(vec3_t color, vec3_t org)
 343 {
 344         int             i;
 345         vec3_t  dist;
 346         float   brightness, r, f;
 347
 348         if (/*gl_flashblend.value ||*/ !r_dynamic.value)
 349                 return;
 350
 351         for (i=0 ; i<MAX_DLIGHTS ; i++)
 352         {
 353                 if (cl_dlights[i].die < cl.time || !cl_dlights[i].radius)
 354                         continue;
 355                 VectorSubtract (org, cl_dlights[i].origin, dist);
 356                 if ((f = DotProduct(dist, dist) + 64.0) < (r = cl_dlights[i].radius*cl_dlights[i].radius))
 357                 {
 358                         brightness = r * 16.0 / f;
 359                         if (cl_dlights[i].dark)
 360                                 brightness = -brightness;
 361                         color[0] += brightness * cl_dlights[i].color[0];
 362                         color[1] += brightness * cl_dlights[i].color[1];
 363                         color[2] += brightness * cl_dlights[i].color[2];
 364                 }
 365         }
 366 }
 367
 368 void R_CompleteLightPoint (vec3_t color, vec3_t p)
 369 {
 370         R_LightPoint(color, p);
 371         R_DynamicLightPointNoMask(color, p);
 372 }
 373
 374 extern float *aliasvert;
 375 extern float *aliasvertnorm;
 376 extern byte *aliasvertcolor;
 377 extern vec_t shadecolor[];
 378 extern float modelalpha;
 379 extern qboolean lighthalf;
 380 void R_LightModel(int numverts, vec3_t center)
 381 {
 382         int i, j, nearlights = 0;
 383         vec3_t dist;
 384         float t, t1, t2, t3, *avn;
 385         byte r,g,b,a, *avc;
 386         struct
 387         {
 388                 vec3_t color;
 389                 vec3_t origin;
 390         } nearlight[MAX_DLIGHTS];
 391         if (!lighthalf)
 392         {
 393                 shadecolor[0] *= 2.0f;
 394                 shadecolor[1] *= 2.0f;
 395                 shadecolor[2] *= 2.0f;
 396         }
 397         avc = aliasvertcolor;
 398         avn = aliasvertnorm;
 399         a = (byte) bound((int) 0, (int) (modelalpha * 255.0f), (int) 255);
 400         if (currententity->effects & EF_FULLBRIGHT)
 401         {
 402                 if (lighthalf)
 403                 {
 404                         r = (byte) ((float) (128.0f * currententity->colormod[0]));
 405                         g = (byte) ((float) (128.0f * currententity->colormod[1]));
 406                         b = (byte) ((float) (128.0f * currententity->colormod[2]));
 407                 }
 408                 else
 409                 {
 410                         r = (byte) ((float) (255.0f * currententity->colormod[0]));
 411                         g = (byte) ((float) (255.0f * currententity->colormod[1]));
 412                         b = (byte) ((float) (255.0f * currententity->colormod[2]));
 413                 }
 414                 for (i = 0;i < numverts;i++)
 415                 {
 416                         *avc++ = r;
 417                         *avc++ = g;
 418                         *avc++ = b;
 419                         *avc++ = a;
 420                 }
 421                 return;
 422         }
 423         if (r_lightmodels.value)
 424         {
 425                 for (i = 0;i < MAX_DLIGHTS;i++)
 426                 {
 427                         if (cl_dlights[i].die < cl.time || !cl_dlights[i].radius)
 428                                 continue;
 429                         VectorSubtract (center, cl_dlights[i].origin, dist);
 430                         if ((t2 = DotProduct(dist,dist) + 16.0f) + 64.0f < (t1 = cl_dlights[i].radius*cl_dlights[i].radius))
 431                         {
 432                                 VectorCopy(cl_dlights[i].origin, nearlight[nearlights].origin);
 433                                 nearlight[nearlights].color[0] = cl_dlights[i].color[0] * cl_dlights[i].radius * cl_dlights[i].radius * 0.5f;
 434                                 nearlight[nearlights].color[1] = cl_dlights[i].color[1] * cl_dlights[i].radius * cl_dlights[i].radius * 0.5f;
 435                                 nearlight[nearlights].color[2] = cl_dlights[i].color[2] * cl_dlights[i].radius * cl_dlights[i].radius * 0.5f;
 436                                 if (cl_dlights[i].dark)
 437                                 {
 438                                         nearlight[nearlights].color[0] = -nearlight[nearlights].color[0];
 439                                         nearlight[nearlights].color[1] = -nearlight[nearlights].color[1];
 440                                         nearlight[nearlights].color[2] = -nearlight[nearlights].color[2];
 441                                 }
 442                                 if (lighthalf)
 443                                 {
 444                                         nearlight[nearlights].color[0] *= 0.5f;
 445                                         nearlight[nearlights].color[1] *= 0.5f;
 446                                         nearlight[nearlights].color[2] *= 0.5f;
 447                                 }
 448                                 t1 = 1.0f / t2;
 449                                 shadecolor[0] += nearlight[nearlights].color[0] * t1;
 450                                 shadecolor[1] += nearlight[nearlights].color[1] * t1;
 451                                 shadecolor[2] += nearlight[nearlights].color[2] * t1;
 452                                 nearlight[nearlights].color[0] *= currententity->colormod[0];
 453                                 nearlight[nearlights].color[1] *= currententity->colormod[1];
 454                                 nearlight[nearlights].color[2] *= currententity->colormod[2];
 455                                 nearlights++;
 456                         }
 457                 }
 458         }
 459         else
 460         {
 461                 for (i = 0;i < MAX_DLIGHTS;i++)
 462                 {
 463                         if (cl_dlights[i].die < cl.time || !cl_dlights[i].radius)
 464                                 continue;
 465                         VectorSubtract (center, cl_dlights[i].origin, dist);
 466                         if ((t2 = DotProduct(dist,dist)) + 64.0f < (t1 = cl_dlights[i].radius*cl_dlights[i].radius))
 467                         {
 468                                 dist[0] = cl_dlights[i].color[0] * cl_dlights[i].radius * cl_dlights[i].radius * 0.5f;
 469                                 dist[1] = cl_dlights[i].color[1] * cl_dlights[i].radius * cl_dlights[i].radius * 0.5f;
 470                                 dist[2] = cl_dlights[i].color[2] * cl_dlights[i].radius * cl_dlights[i].radius * 0.5f;
 471                                 if (cl_dlights[i].dark)
 472                                 {
 473                                         dist[0] = -dist[0];
 474                                         dist[1] = -dist[1];
 475                                         dist[2] = -dist[2];
 476                                 }
 477                                 if (lighthalf)
 478                                 {
 479                                         dist[0] *= 0.5f;
 480                                         dist[1] *= 0.5f;
 481                                         dist[2] *= 0.5f;
 482                                 }
 483                                 t1 = 1.5f / t2;
 484                                 shadecolor[0] += dist[0] * t1;
 485                                 shadecolor[1] += dist[1] * t1;
 486                                 shadecolor[2] += dist[2] * t1;
 487                         }
 488                 }
 489         }
 490         shadecolor[0] *= currententity->colormod[0];
 491         shadecolor[1] *= currententity->colormod[1];
 492         shadecolor[2] *= currententity->colormod[2];
 493         t1 = bound(0, shadecolor[0], 255);r = (byte) t1;
 494         t1 = bound(0, shadecolor[1], 255);g = (byte) t1;
 495         t1 = bound(0, shadecolor[2], 255);b = (byte) t1;
 496         if (nearlights)
 497         {
 498                 int temp;
 499                 vec3_t v;
 500                 float *av;
 501                 av = aliasvert;
 502                 if (nearlights == 1)
 503                 {
 504                         for (i = 0;i < numverts;i++)
 505                         {
 506                                 VectorSubtract(nearlight[0].origin, av, v);
 507                                 t = DotProduct(avn,v);
 508                                 if (t > 0)
 509                                 {
 510                                         t /= DotProduct(v,v);
 511                                         temp = (int) ((float) (shadecolor[0] + nearlight[0].color[0] * t));if (temp < 0) temp = 0;else if (temp > 255) temp = 255;*avc++ = temp;
 512                                         temp = (int) ((float) (shadecolor[1] + nearlight[0].color[1] * t));if (temp < 0) temp = 0;else if (temp > 255) temp = 255;*avc++ = temp;
 513                                         temp = (int) ((float) (shadecolor[2] + nearlight[0].color[2] * t));if (temp < 0) temp = 0;else if (temp > 255) temp = 255;*avc++ = temp;
 514                                 }
 515                                 else
 516                                 {
 517                                         *avc++ = r;
 518                                         *avc++ = g;
 519                                         *avc++ = b;
 520                                 }
 521                                 *avc++ = a;
 522                                 av+=3;
 523                                 avn+=3;
 524                         }
 525                 }
 526                 else
 527                 {
 528                         int i1, i2, i3;
 529                         for (i = 0;i < numverts;i++)
 530                         {
 531                                 t1 = shadecolor[0];
 532                                 t2 = shadecolor[1];
 533                                 t3 = shadecolor[2];
 534                                 for (j = 0;j < nearlights;j++)
 535                                 {
 536                                         VectorSubtract(nearlight[j].origin, av, v);
 537                                         t = DotProduct(avn,v);
 538                                         if (t > 0)
 539                                         {
 540                                                 t /= DotProduct(v,v);
 541                                                 t1 += nearlight[j].color[0] * t;
 542                                                 t2 += nearlight[j].color[1] * t;
 543                                                 t3 += nearlight[j].color[2] * t;
 544                                         }
 545                                 }
 546                                 i1 = t1;if (i1 < 0) i1 = 0;else if (i1 > 255) i1 = 255;
 547                                 i2 = t2;if (i2 < 0) i2 = 0;else if (i2 > 255) i2 = 255;
 548                                 i3 = t3;if (i3 < 0) i3 = 0;else if (i3 > 255) i3 = 255;
 549                                 *avc++ = i1;
 550                                 *avc++ = i2;
 551                                 *avc++ = i3;
 552                                 *avc++ = a;
 553                         }
 554                 }
 555         }
 556         else
 557         {
 558                 for (i = 0;i < numverts;i++)
 559                 {
 560                         *avc++ = r;
 561                         *avc++ = g;
 562                         *avc++ = b;
 563                         *avc++ = a;
 564                 }
 565         }
 566 }