main/lighting.c

   1 /*
   2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   3 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   4 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   6 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   8 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
   9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  11 COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  12 */
  13
  14 /*
  15  *
  16  * Lighting functions.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <conf.h>
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <string.h>     // for memset()
  26
  27 #include "fix.h"
  28 #include "vecmat.h"
  29 #include "gr.h"
  30 #include "inferno.h"
  31 #include "error.h"
  32 #include "mono.h"
  33 #include "3d.h"
  34 #include "timer.h"
  35
  36
  37 int     Do_dynamic_light=1;
  38 //int   Use_fvi_lighting = 0;
  39
  40 fix     Dynamic_light[MAX_VERTICES];
  41
  42 #define LIGHTING_CACHE_SIZE     4096    //      Must be power of 2!
  43 #define LIGHTING_FRAME_DELTA    256     //      Recompute cache value every 8 frames.
  44 #define LIGHTING_CACHE_SHIFT    8
  45
  46 int     Lighting_frame_delta = 1;
  47
  48 int     Lighting_cache[LIGHTING_CACHE_SIZE];
  49
  50 int Cache_hits=0, Cache_lookups=1;
  51
  52 //      Return true if we think vertex vertnum is visible from segment segnum.
  53 //      If some amount of time has gone by, then recompute, else use cached value.
  54 int lighting_cache_visible(int vertnum, int segnum, int objnum, vms_vector *obj_pos, int obj_seg, vms_vector *vertpos)
  55 {
  56         int     cache_val, cache_frame, cache_vis;
  57
  58         cache_val = Lighting_cache[((segnum << LIGHTING_CACHE_SHIFT) ^ vertnum) & (LIGHTING_CACHE_SIZE-1)];
  59
  60         cache_frame = cache_val >> 1;
  61         cache_vis = cache_val & 1;
  62
  63 //mprintf((0, "%i %i %5i %i ", vertnum, segnum, cache_frame, cache_vis));
  64
  65 Cache_lookups++;
  66         if ((cache_frame == 0) || (cache_frame + Lighting_frame_delta <= FrameCount)) {
  67                 int                     apply_light=0;
  68                 fvi_query       fq;
  69                 fvi_info                hit_data;
  70                 int                     segnum, hit_type;
  71
  72                 segnum = -1;
  73
  74                 #ifndef NDEBUG
  75                 segnum = find_point_seg(obj_pos, obj_seg);
  76                 if (segnum == -1) {
  77                         Int3();         //      Obj_pos is not in obj_seg!
  78                         return 0;               //      Done processing this object.
  79                 }
  80                 #endif
  81
  82                 fq.p0                                           = obj_pos;
  83                 fq.startseg                             = obj_seg;
  84                 fq.p1                                           = vertpos;
  85                 fq.rad                                  = 0;
  86                 fq.thisobjnum                   = objnum;
  87                 fq.ignore_obj_list      = NULL;
  88                 fq.flags                                        = FQ_TRANSWALL;
  89
  90                 hit_type = find_vector_intersection(&fq, &hit_data);
  91
  92                 // Hit_pos = Hit_data.hit_pnt;
  93                 // Hit_seg = Hit_data.hit_seg;
  94
  95                 if (hit_type == HIT_OBJECT)
  96                         Int3(); //      Hey, we're not supposed to be checking objects!
  97
  98                 if (hit_type == HIT_NONE)
  99                         apply_light = 1;
 100                 else if (hit_type == HIT_WALL) {
 101                         fix     dist_dist;
 102                         dist_dist = vm_vec_dist_quick(&hit_data.hit_pnt, obj_pos);
 103                         if (dist_dist < F1_0/4) {
 104                                 apply_light = 1;
 105                                 // -- Int3();   //      Curious, did fvi detect intersection with wall containing vertex?
 106                         }
 107                 }
 108                 Lighting_cache[((segnum << LIGHTING_CACHE_SHIFT) ^ vertnum) & (LIGHTING_CACHE_SIZE-1)] = apply_light + (FrameCount << 1);
 109 //mprintf((0, "%i\n", apply_light));
 110                 return apply_light;
 111         } else {
 112 //mprintf((0, "\n"));
 113 Cache_hits++;
 114                 return cache_vis;
 115         }
 116 }
 117
 118 #define HEADLIGHT_CONE_DOT      (F1_0*9/10)
 119 #define HEADLIGHT_SCALE         (F1_0*10)
 120
 121 // ----------------------------------------------------------------------------------------------
 122 void apply_light(fix obj_intensity, int obj_seg, vms_vector *obj_pos, int n_render_vertices, short *render_vertices, int objnum)
 123 {
 124         int     vv;
 125
 126         if (obj_intensity) {
 127                 fix     obji_64 = obj_intensity*64;
 128
 129                 // for pretty dim sources, only process vertices in object's own segment.
 130                 //      12/04/95, MK, markers only cast light in own segment.
 131                 if ((abs(obji_64) <= F1_0*8) || (Objects[objnum].type == OBJ_MARKER)) {
 132                         short *vp = Segments[obj_seg].verts;
 133
 134                         for (vv=0; vv<MAX_VERTICES_PER_SEGMENT; vv++) {
 135                                 int                     vertnum;
 136                                 vms_vector      *vertpos;
 137                                 fix                     dist;
 138
 139                                 vertnum = vp[vv];
 140                                 if ((vertnum ^ FrameCount) & 1) {
 141                                         vertpos = &Vertices[vertnum];
 142                                         dist = vm_vec_dist_quick(obj_pos, vertpos);
 143                                         dist = fixmul(dist/4, dist/4);
 144                                         if (dist < abs(obji_64)) {
 145                                                 if (dist < MIN_LIGHT_DIST)
 146                                                         dist = MIN_LIGHT_DIST;
 147
 148                                                 Dynamic_light[vertnum] += fixdiv(obj_intensity, dist);
 149                                         }
 150                                 }
 151                         }
 152                 } else {
 153                         int     headlight_shift = 0;
 154                         fix     max_headlight_dist = F1_0*200;
 155
 156                         if (Objects[objnum].type == OBJ_PLAYER)
 157                                 if (Players[Objects[objnum].id].flags & PLAYER_FLAGS_HEADLIGHT_ON) {
 158                                         headlight_shift = 3;
 159                                         if (Objects[objnum].id != Player_num) {
 160                                                 vms_vector      tvec;
 161                                                 fvi_query       fq;
 162                                                 fvi_info                hit_data;
 163                                                 int                     fate;
 164
 165                                                 vm_vec_scale_add(&tvec, &Objects[objnum].pos, &Objects[objnum].orient.fvec, F1_0*200);
 166
 167                                                 fq.startseg                             = Objects[objnum].segnum;
 168                                                 fq.p0                                           = &Objects[objnum].pos;
 169                                                 fq.p1                                           = &tvec;
 170                                                 fq.rad                                  = 0;
 171                                                 fq.thisobjnum                   = objnum;
 172                                                 fq.ignore_obj_list      = NULL;
 173                                                 fq.flags                                        = FQ_TRANSWALL;
 174
 175                                                 fate = find_vector_intersection(&fq, &hit_data);
 176                                                 if (fate != HIT_NONE)
 177                                                         max_headlight_dist = vm_vec_mag_quick(vm_vec_sub(&tvec, &hit_data.hit_pnt, &Objects[objnum].pos)) + F1_0*4;
 178                                         }
 179                                 }
 180                         // -- for (vv=FrameCount&1; vv<n_render_vertices; vv+=2) {
 181                         for (vv=0; vv<n_render_vertices; vv++) {
 182                                 int                     vertnum;
 183                                 vms_vector      *vertpos;
 184                                 fix                     dist;
 185                                 int                     apply_light;
 186
 187                                 vertnum = render_vertices[vv];
 188                                 if ((vertnum ^ FrameCount) & 1) {
 189                                         vertpos = &Vertices[vertnum];
 190                                         dist = vm_vec_dist_quick(obj_pos, vertpos);
 191                                         apply_light = 0;
 192
 193                                         if ((dist >> headlight_shift) < abs(obji_64)) {
 194
 195                                                 if (dist < MIN_LIGHT_DIST)
 196                                                         dist = MIN_LIGHT_DIST;
 197
 198                                                 //if (Use_fvi_lighting) {
 199                                                 //      if (lighting_cache_visible(vertnum, obj_seg, objnum, obj_pos, obj_seg, vertpos)) {
 200                                                 //              apply_light = 1;
 201                                                 //      }
 202                                                 //} else
 203                                                         apply_light = 1;
 204
 205                                                 if (apply_light) {
 206                                                         if (headlight_shift) {
 207                                                                 fix                     dot;
 208                                                                 vms_vector      vec_to_point;
 209
 210                                                                 vm_vec_sub(&vec_to_point, vertpos, obj_pos);
 211                                                                 vm_vec_normalize_quick(&vec_to_point);          //      MK, Optimization note: You compute distance about 15 lines up, this is partially redundant
 212                                                                 dot = vm_vec_dot(&vec_to_point, &Objects[objnum].orient.fvec);
 213                                                                 if (dot < F1_0/2)
 214                                                                         Dynamic_light[vertnum] += fixdiv(obj_intensity, fixmul(HEADLIGHT_SCALE, dist)); //      Do the normal thing, but darken around headlight.
 215                                                                 else {
 216                                                                         if (Game_mode & GM_MULTI) {
 217                                                                                 if (dist < max_headlight_dist)
 218                                                                                         Dynamic_light[vertnum] += fixmul(fixmul(dot, dot), obj_intensity)/8;
 219                                                                         } else
 220                                                                                 Dynamic_light[vertnum] += fixmul(fixmul(dot, dot), obj_intensity)/8;
 221                                                                 }
 222                                                         } else
 223                                                                 Dynamic_light[vertnum] += fixdiv(obj_intensity, dist);
 224                                                 }
 225                                         }
 226                                 }
 227                         }
 228                 }
 229         }
 230 }
 231
 232 #define FLASH_LEN_FIXED_SECONDS (F1_0/3)
 233 #define FLASH_SCALE                                     (3*F1_0/FLASH_LEN_FIXED_SECONDS)
 234
 235 // ----------------------------------------------------------------------------------------------
 236 void cast_muzzle_flash_light(int n_render_vertices, short *render_vertices)
 237 {
 238         fix current_time;
 239         int     i;
 240         short   time_since_flash;
 241
 242         current_time = timer_get_fixed_seconds();
 243
 244         for (i=0; i<MUZZLE_QUEUE_MAX; i++) {
 245                 if (Muzzle_data[i].create_time) {
 246                         time_since_flash = current_time - Muzzle_data[i].create_time;
 247                         if (time_since_flash < FLASH_LEN_FIXED_SECONDS)
 248                                 apply_light((FLASH_LEN_FIXED_SECONDS - time_since_flash) * FLASH_SCALE, Muzzle_data[i].segnum, &Muzzle_data[i].pos, n_render_vertices, render_vertices, -1);
 249                         else
 250                                 Muzzle_data[i].create_time = 0;         // turn off this muzzle flash
 251                 }
 252         }
 253 }
 254
 255 //      Translation table to make flares flicker at different rates
 256 fix     Obj_light_xlate[16] =
 257         {0x1234, 0x3321, 0x2468, 0x1735,
 258          0x0123, 0x19af, 0x3f03, 0x232a,
 259          0x2123, 0x39af, 0x0f03, 0x132a,
 260          0x3123, 0x29af, 0x1f03, 0x032a};
 261
 262 //      Flag array of objects lit last frame.  Guaranteed to process this frame if lit last frame.
 263 sbyte   Lighting_objects[MAX_OBJECTS];
 264
 265 #define MAX_HEADLIGHTS  8
 266 object  *Headlights[MAX_HEADLIGHTS];
 267 int             Num_headlights;
 268
 269 // ---------------------------------------------------------
 270 fix compute_light_intensity(int objnum)
 271 {
 272         object          *obj = &Objects[objnum];
 273         int                     objtype = obj->type;
 274    fix hoardlight,s;
 275
 276         switch (objtype) {
 277                 case OBJ_PLAYER:
 278                          if (Players[obj->id].flags & PLAYER_FLAGS_HEADLIGHT_ON) {
 279                                 if (Num_headlights < MAX_HEADLIGHTS)
 280                                         Headlights[Num_headlights++] = obj;
 281                                 return HEADLIGHT_SCALE;
 282                          } else if ((Game_mode & GM_HOARD) && Players[obj->id].secondary_ammo[PROXIMITY_INDEX]) {
 283
 284                    // If hoard game and player, add extra light based on how many orbs you have
 285                         // Pulse as well.
 286
 287                            hoardlight=i2f(Players[obj->id].secondary_ammo[PROXIMITY_INDEX])/2; //i2f(12));
 288                                 hoardlight++;
 289                       fix_sincos ((GameTime/2) & 0xFFFF,&s,NULL); // probably a bad way to do it
 290                            s+=F1_0;
 291                                 s>>=1;
 292                            hoardlight=fixmul (s,hoardlight);
 293                  //     mprintf ((0,"Hoardlight is %f!\n",f2fl(hoardlight)));
 294                       return (hoardlight);
 295                           }
 296                         else
 297                                 return max(vm_vec_mag_quick(&obj->mtype.phys_info.thrust)/4, F1_0*2) + F1_0/2;
 298                         break;
 299                 case OBJ_FIREBALL:
 300                         if (obj->id != 0xff) {
 301                                 if (obj->lifeleft < F1_0*4)
 302                                         return fixmul(fixdiv(obj->lifeleft, Vclip[obj->id].play_time), Vclip[obj->id].light_value);
 303                                 else
 304                                         return Vclip[obj->id].light_value;
 305                         } else
 306                                  return 0;
 307                         break;
 308                 case OBJ_ROBOT:
 309                         return F1_0*Robot_info[obj->id].lightcast;
 310                         break;
 311                 case OBJ_WEAPON: {
 312                         fix tval = Weapon_info[obj->id].light;
 313                         if (Game_mode & GM_MULTI)
 314                                 if (obj->id == OMEGA_ID)
 315                                         if (d_rand() > 8192)
 316                                                 return 0;               //      3/4 of time, omega blobs will cast 0 light!
 317
 318                         if (obj->id == FLARE_ID )
 319                                 return 2* (min(tval, obj->lifeleft) + ((GameTime ^ Obj_light_xlate[objnum&0x0f]) & 0x3fff));
 320                         else
 321                                 return tval;
 322                 }
 323
 324                 case OBJ_MARKER: {
 325                         fix     lightval = obj->lifeleft;
 326
 327                         lightval &= 0xffff;
 328
 329                         lightval = 8 * abs(F1_0/2 - lightval);
 330
 331                         if (obj->lifeleft < F1_0*1000)
 332                                 obj->lifeleft += F1_0;  //      Make sure this object doesn't go out.
 333
 334                         return lightval;
 335                 }
 336
 337                 case OBJ_POWERUP:
 338                         return Powerup_info[obj->id].light;
 339                         break;
 340                 case OBJ_DEBRIS:
 341                         return F1_0/4;
 342                         break;
 343                 case OBJ_LIGHT:
 344                         return obj->ctype.light_info.intensity;
 345                         break;
 346                 default:
 347                         return 0;
 348                         break;
 349         }
 350 }
 351
 352 // ----------------------------------------------------------------------------------------------
 353 void set_dynamic_light(void)
 354 {
 355         int     vv;
 356         int     objnum;
 357         int     n_render_vertices;
 358         short   render_vertices[MAX_VERTICES];
 359         sbyte   render_vertex_flags[MAX_VERTICES];
 360         int     render_seg,segnum, v;
 361         sbyte   new_lighting_objects[MAX_OBJECTS];
 362
 363         Num_headlights = 0;
 364
 365         if (!Do_dynamic_light)
 366                 return;
 367
 368 //if (Use_fvi_lighting)
 369 //      mprintf((0, "hits = %8i, misses = %8i, lookups = %8i, hit ratio = %7.4f\n", Cache_hits, Cache_lookups - Cache_hits, Cache_lookups, (float) Cache_hits / Cache_lookups));
 370
 371         memset(render_vertex_flags, 0, Highest_vertex_index+1);
 372
 373         //      Create list of vertices that need to be looked at for setting of ambient light.
 374         n_render_vertices = 0;
 375         for (render_seg=0; render_seg<N_render_segs; render_seg++) {
 376                 segnum = Render_list[render_seg];
 377                 if (segnum != -1) {
 378                         short   *vp = Segments[segnum].verts;
 379                         for (v=0; v<MAX_VERTICES_PER_SEGMENT; v++) {
 380                                 int     vnum = vp[v];
 381                                 if (vnum<0 || vnum>Highest_vertex_index) {
 382                                         Int3();         //invalid vertex number
 383                                         continue;       //ignore it, and go on to next one
 384                                 }
 385                                 if (!render_vertex_flags[vnum]) {
 386                                         render_vertex_flags[vnum] = 1;
 387                                         render_vertices[n_render_vertices++] = vnum;
 388                                 }
 389                                 //--old way-- for (s=0; s<n_render_vertices; s++)
 390                                 //--old way--   if (render_vertices[s] == vnum)
 391                                 //--old way--           break;
 392                                 //--old way-- if (s == n_render_vertices)
 393                                 //--old way--   render_vertices[n_render_vertices++] = vnum;
 394                         }
 395                 }
 396         }
 397
 398         // -- for (vertnum=FrameCount&1; vertnum<n_render_vertices; vertnum+=2) {
 399         for (vv=0; vv<n_render_vertices; vv++) {
 400                 int     vertnum;
 401
 402                 vertnum = render_vertices[vv];
 403                 Assert(vertnum >= 0 && vertnum <= Highest_vertex_index);
 404                 if ((vertnum ^ FrameCount) & 1)
 405                         Dynamic_light[vertnum] = 0;
 406         }
 407
 408         cast_muzzle_flash_light(n_render_vertices, render_vertices);
 409
 410         for (objnum=0; objnum<=Highest_object_index; objnum++)
 411                 new_lighting_objects[objnum] = 0;
 412
 413         //      July 5, 1995: New faster dynamic lighting code.  About 5% faster on the PC (un-optimized).
 414         //      Only objects which are in rendered segments cast dynamic light.  We might wad6 to extend this
 415         //      one or two segments if we notice light changing as objects go offscreen.  I couldn't see any
 416         //      serious visual degradation.  In fact, I could see no humorous degradation, either. --MK
 417         for (render_seg=0; render_seg<N_render_segs; render_seg++) {
 418                 int     segnum = Render_list[render_seg];
 419
 420                 objnum = Segments[segnum].objects;
 421
 422                 while (objnum != -1) {
 423                         object          *obj = &Objects[objnum];
 424                         vms_vector      *objpos = &obj->pos;
 425                         fix                     obj_intensity;
 426
 427                         obj_intensity = compute_light_intensity(objnum);
 428
 429                         if (obj_intensity) {
 430                                 apply_light(obj_intensity, obj->segnum, objpos, n_render_vertices, render_vertices, OBJECT_NUMBER(obj));
 431                                 new_lighting_objects[objnum] = 1;
 432                         }
 433
 434                         objnum = obj->next;
 435                 }
 436         }
 437
 438         //      Now, process all lights from last frame which haven't been processed this frame.
 439         for (objnum=0; objnum<=Highest_object_index; objnum++) {
 440                 //      In multiplayer games, process even unprocessed objects every 4th frame, else don't know about player sneaking up.
 441                 if ((Lighting_objects[objnum]) || ((Game_mode & GM_MULTI) && (((objnum ^ FrameCount) & 3) == 0))) {
 442                         if (!new_lighting_objects[objnum]) {
 443                                 //      Lighted last frame, but not this frame.  Get intensity...
 444                                 object          *obj = &Objects[objnum];
 445                                 vms_vector      *objpos = &obj->pos;
 446                                 fix                     obj_intensity;
 447
 448                                 obj_intensity = compute_light_intensity(objnum);
 449
 450                                 if (obj_intensity) {
 451                                         apply_light(obj_intensity, obj->segnum, objpos, n_render_vertices, render_vertices, objnum);
 452                                         Lighting_objects[objnum] = 1;
 453                                 } else
 454                                         Lighting_objects[objnum] = 0;
 455                         }
 456                 } else {
 457                         //      Not lighted last frame, so we don't need to light it.  (Already lit if casting light this frame.)
 458                         //      But copy value from new_lighting_objects to update Lighting_objects array.
 459                         Lighting_objects[objnum] = new_lighting_objects[objnum];
 460                 }
 461         }
 462 }
 463
 464 // ---------------------------------------------------------
 465
 466 void toggle_headlight_active()
 467 {
 468         if (Players[Player_num].flags & PLAYER_FLAGS_HEADLIGHT) {
 469                 Players[Player_num].flags ^= PLAYER_FLAGS_HEADLIGHT_ON;
 470 #ifdef NETWORK
 471                 if (Game_mode & GM_MULTI)
 472                         multi_send_flags(Player_num);
 473 #endif
 474         }
 475 }
 476
 477 #define HEADLIGHT_BOOST_SCALE 8         //how much to scale light when have headlight boost
 478
 479 fix     Beam_brightness = (F1_0/2);     //global saying how bright the light beam is
 480
 481 #define MAX_DIST_LOG    6                                                       //log(MAX_DIST-expressed-as-integer)
 482 #define MAX_DIST                (f1_0<<MAX_DIST_LOG)    //no light beyond this dist
 483
 484 fix compute_headlight_light_on_object(object *objp)
 485 {
 486         int     i;
 487         fix     light;
 488
 489         //      Let's just illuminate players and robots for speed reasons, ok?
 490         if ((objp->type != OBJ_ROBOT) && (objp->type    != OBJ_PLAYER))
 491                 return 0;
 492
 493         light = 0;
 494
 495         for (i=0; i<Num_headlights; i++) {
 496                 fix                     dot, dist;
 497                 vms_vector      vec_to_obj;
 498                 object          *light_objp;
 499
 500                 light_objp = Headlights[i];
 501
 502                 vm_vec_sub(&vec_to_obj, &objp->pos, &light_objp->pos);
 503                 dist = vm_vec_normalize_quick(&vec_to_obj);
 504                 if (dist > 0) {
 505                         dot = vm_vec_dot(&light_objp->orient.fvec, &vec_to_obj);
 506
 507                         if (dot < F1_0/2)
 508                                 light += fixdiv(HEADLIGHT_SCALE, fixmul(HEADLIGHT_SCALE, dist));        //      Do the normal thing, but darken around headlight.
 509                         else
 510                                 light += fixmul(fixmul(dot, dot), HEADLIGHT_SCALE)/8;
 511                 }
 512         }
 513
 514         return light;
 515 }
 516
 517
 518 // -- Unused -- //Compute the lighting from the headlight for a given vertex on a face.
 519 // -- Unused -- //Takes:
 520 // -- Unused -- //  point - the 3d coords of the point
 521 // -- Unused -- //  face_light - a scale factor derived from the surface normal of the face
 522 // -- Unused -- //If no surface normal effect is wanted, pass F1_0 for face_light
 523 // -- Unused -- fix compute_headlight_light(vms_vector *point,fix face_light)
 524 // -- Unused -- {
 525 // -- Unused --         fix light;
 526 // -- Unused --         int use_beam = 0;               //flag for beam effect
 527 // -- Unused --
 528 // -- Unused --         light = Beam_brightness;
 529 // -- Unused --
 530 // -- Unused --         if ((Players[Player_num].flags & PLAYER_FLAGS_HEADLIGHT) && (Players[Player_num].flags & PLAYER_FLAGS_HEADLIGHT_ON) && Viewer==&Objects[Players[Player_num].objnum] && Players[Player_num].energy > 0) {
 531 // -- Unused --                 light *= HEADLIGHT_BOOST_SCALE;
 532 // -- Unused --                 use_beam = 1;   //give us beam effect
 533 // -- Unused --         }
 534 // -- Unused --
 535 // -- Unused --         if (light) {                            //if no beam, don't bother with the rest of this
 536 // -- Unused --                 fix point_dist;
 537 // -- Unused --
 538 // -- Unused --                 point_dist = vm_vec_mag_quick(point);
 539 // -- Unused --
 540 // -- Unused --                 if (point_dist >= MAX_DIST)
 541 // -- Unused --
 542 // -- Unused --                         light = 0;
 543 // -- Unused --
 544 // -- Unused --                 else {
 545 // -- Unused --                         fix dist_scale,face_scale;
 546 // -- Unused --
 547 // -- Unused --                         dist_scale = (MAX_DIST - point_dist) >> MAX_DIST_LOG;
 548 // -- Unused --                         light = fixmul(light,dist_scale);
 549 // -- Unused --
 550 // -- Unused --                         if (face_light < 0)
 551 // -- Unused --                                 face_light = 0;
 552 // -- Unused --
 553 // -- Unused --                         face_scale = f1_0/4 + face_light/2;
 554 // -- Unused --                         light = fixmul(light,face_scale);
 555 // -- Unused --
 556 // -- Unused --                         if (use_beam) {
 557 // -- Unused --                                 fix beam_scale;
 558 // -- Unused --
 559 // -- Unused --                                 if (face_light > f1_0*3/4 && point->z > i2f(12)) {
 560 // -- Unused --                                         beam_scale = fixdiv(point->z,point_dist);
 561 // -- Unused --                                         beam_scale = fixmul(beam_scale,beam_scale);     //square it
 562 // -- Unused --                                         light = fixmul(light,beam_scale);
 563 // -- Unused --                                 }
 564 // -- Unused --                         }
 565 // -- Unused --                 }
 566 // -- Unused --         }
 567 // -- Unused --
 568 // -- Unused --         return light;
 569 // -- Unused -- }
 570
 571 //compute the average dynamic light in a segment.  Takes the segment number
 572 fix compute_seg_dynamic_light(int segnum)
 573 {
 574         fix sum;
 575         segment *seg;
 576         short *verts;
 577
 578         seg = &Segments[segnum];
 579
 580         verts = seg->verts;
 581         sum = 0;
 582
 583         sum += Dynamic_light[*verts++];
 584         sum += Dynamic_light[*verts++];
 585         sum += Dynamic_light[*verts++];
 586         sum += Dynamic_light[*verts++];
 587         sum += Dynamic_light[*verts++];
 588         sum += Dynamic_light[*verts++];
 589         sum += Dynamic_light[*verts++];
 590         sum += Dynamic_light[*verts];
 591
 592         return sum >> 3;
 593
 594 }
 595
 596 fix object_light[MAX_OBJECTS];
 597 int object_sig[MAX_OBJECTS];
 598 object *old_viewer;
 599 int reset_lighting_hack;
 600
 601 #define LIGHT_RATE i2f(4)               //how fast the light ramps up
 602
 603 void start_lighting_frame(object *viewer)
 604 {
 605         reset_lighting_hack = (viewer != old_viewer);
 606
 607         old_viewer = viewer;
 608 }
 609
 610 //compute the lighting for an object.  Takes a pointer to the object,
 611 //and possibly a rotated 3d point.  If the point isn't specified, the
 612 //object's center point is rotated.
 613 fix compute_object_light(object *obj,vms_vector *rotated_pnt)
 614 {
 615         fix light;
 616         g3s_point objpnt;
 617         int objnum = OBJECT_NUMBER(obj);
 618
 619         if (!rotated_pnt) {
 620                 g3_rotate_point(&objpnt,&obj->pos);
 621                 rotated_pnt = &objpnt.p3_vec;
 622         }
 623
 624         //First, get static light for this segment
 625
 626         light = Segment2s[obj->segnum].static_light;
 627
 628         //return light;
 629
 630
 631         //Now, maybe return different value to smooth transitions
 632
 633         if (!reset_lighting_hack && object_sig[objnum] == obj->signature) {
 634                 fix delta_light,frame_delta;
 635
 636                 delta_light = light - object_light[objnum];
 637
 638                 frame_delta = fixmul(LIGHT_RATE,FrameTime);
 639
 640                 if (abs(delta_light) <= frame_delta)
 641
 642                         object_light[objnum] = light;           //we've hit the goal
 643
 644                 else
 645
 646                         if (delta_light < 0)
 647                                 light = object_light[objnum] -= frame_delta;
 648                         else
 649                                 light = object_light[objnum] += frame_delta;
 650
 651         }
 652         else {          //new object, initialize
 653
 654                 object_sig[objnum] = obj->signature;
 655                 object_light[objnum] = light;
 656         }
 657
 658
 659
 660         //Next, add in headlight on this object
 661
 662         // -- Matt code: light += compute_headlight_light(rotated_pnt,f1_0);
 663         light += compute_headlight_light_on_object(obj);
 664
 665         //Finally, add in dynamic light for this segment
 666
 667         light += compute_seg_dynamic_light(obj->segnum);
 668
 669
 670         return light;
 671 }
 672
 673