main/lighting.c

   1 /* $Id: lighting.c,v 1.5 2004-08-28 23:17:45 schaffner Exp $ */
   2 /*
   3 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   4 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   5 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   6 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   7 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   8 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   9 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
  10 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  11 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  12 COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  13 */
  14
  15 /*
  16  *
  17  * Lighting functions.
  18  *
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <conf.h>
  23 #endif
  24
  25 #ifdef RCS
  26 static char rcsid[] = "$Id: lighting.c,v 1.5 2004-08-28 23:17:45 schaffner Exp $";
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <string.h>     // for memset()
  31
  32 #include "fix.h"
  33 #include "vecmat.h"
  34 #include "gr.h"
  35 #include "inferno.h"
  36 #include "segment.h"
  37 #include "error.h"
  38 #include "mono.h"
  39 #include "render.h"
  40 #include "game.h"
  41 #include "vclip.h"
  42 #include "lighting.h"
  43 #include "3d.h"
  44 #include "laser.h"
  45 #include "timer.h"
  46 #include "player.h"
  47 #include "weapon.h"
  48 #include "powerup.h"
  49 #include "fvi.h"
  50 #include "robot.h"
  51 #include "multi.h"
  52
  53 int     Do_dynamic_light=1;
  54 //int   Use_fvi_lighting = 0;
  55
  56 fix     Dynamic_light[MAX_VERTICES];
  57
  58 #define LIGHTING_CACHE_SIZE     4096    //      Must be power of 2!
  59 #define LIGHTING_FRAME_DELTA    256     //      Recompute cache value every 8 frames.
  60 #define LIGHTING_CACHE_SHIFT    8
  61
  62 int     Lighting_frame_delta = 1;
  63
  64 int     Lighting_cache[LIGHTING_CACHE_SIZE];
  65
  66 int Cache_hits=0, Cache_lookups=1;
  67
  68 //      Return true if we think vertex vertnum is visible from segment segnum.
  69 //      If some amount of time has gone by, then recompute, else use cached value.
  70 int lighting_cache_visible(int vertnum, int segnum, int objnum, vms_vector *obj_pos, int obj_seg, vms_vector *vertpos)
  71 {
  72         int     cache_val, cache_frame, cache_vis;
  73
  74         cache_val = Lighting_cache[((segnum << LIGHTING_CACHE_SHIFT) ^ vertnum) & (LIGHTING_CACHE_SIZE-1)];
  75
  76         cache_frame = cache_val >> 1;
  77         cache_vis = cache_val & 1;
  78
  79 //mprintf((0, "%i %i %5i %i ", vertnum, segnum, cache_frame, cache_vis));
  80
  81 Cache_lookups++;
  82         if ((cache_frame == 0) || (cache_frame + Lighting_frame_delta <= FrameCount)) {
  83                 int                     apply_light=0;
  84                 fvi_query       fq;
  85                 fvi_info                hit_data;
  86                 int                     segnum, hit_type;
  87
  88                 segnum = -1;
  89
  90                 #ifndef NDEBUG
  91                 segnum = find_point_seg(obj_pos, obj_seg);
  92                 if (segnum == -1) {
  93                         Int3();         //      Obj_pos is not in obj_seg!
  94                         return 0;               //      Done processing this object.
  95                 }
  96                 #endif
  97
  98                 fq.p0                                           = obj_pos;
  99                 fq.startseg                             = obj_seg;
 100                 fq.p1                                           = vertpos;
 101                 fq.rad                                  = 0;
 102                 fq.thisobjnum                   = objnum;
 103                 fq.ignore_obj_list      = NULL;
 104                 fq.flags                                        = FQ_TRANSWALL;
 105
 106                 hit_type = find_vector_intersection(&fq, &hit_data);
 107
 108                 // Hit_pos = Hit_data.hit_pnt;
 109                 // Hit_seg = Hit_data.hit_seg;
 110
 111                 if (hit_type == HIT_OBJECT)
 112                         Int3(); //      Hey, we're not supposed to be checking objects!
 113
 114                 if (hit_type == HIT_NONE)
 115                         apply_light = 1;
 116                 else if (hit_type == HIT_WALL) {
 117                         fix     dist_dist;
 118                         dist_dist = vm_vec_dist_quick(&hit_data.hit_pnt, obj_pos);
 119                         if (dist_dist < F1_0/4) {
 120                                 apply_light = 1;
 121                                 // -- Int3();   //      Curious, did fvi detect intersection with wall containing vertex?
 122                         }
 123                 }
 124                 Lighting_cache[((segnum << LIGHTING_CACHE_SHIFT) ^ vertnum) & (LIGHTING_CACHE_SIZE-1)] = apply_light + (FrameCount << 1);
 125 //mprintf((0, "%i\n", apply_light));
 126                 return apply_light;
 127         } else {
 128 //mprintf((0, "\n"));
 129 Cache_hits++;
 130                 return cache_vis;
 131         }
 132 }
 133
 134 #define HEADLIGHT_CONE_DOT      (F1_0*9/10)
 135 #define HEADLIGHT_SCALE         (F1_0*10)
 136
 137 // ----------------------------------------------------------------------------------------------
 138 void apply_light(fix obj_intensity, int obj_seg, vms_vector *obj_pos, int n_render_vertices, short *render_vertices, int objnum)
 139 {
 140         int     vv;
 141
 142         if (obj_intensity) {
 143                 fix     obji_64 = obj_intensity*64;
 144
 145                 // for pretty dim sources, only process vertices in object's own segment.
 146                 //      12/04/95, MK, markers only cast light in own segment.
 147                 if ((abs(obji_64) <= F1_0*8) || (Objects[objnum].type == OBJ_MARKER)) {
 148                         short *vp = Segments[obj_seg].verts;
 149
 150                         for (vv=0; vv<MAX_VERTICES_PER_SEGMENT; vv++) {
 151                                 int                     vertnum;
 152                                 vms_vector      *vertpos;
 153                                 fix                     dist;
 154
 155                                 vertnum = vp[vv];
 156                                 if ((vertnum ^ FrameCount) & 1) {
 157                                         vertpos = &Vertices[vertnum];
 158                                         dist = vm_vec_dist_quick(obj_pos, vertpos);
 159                                         dist = fixmul(dist/4, dist/4);
 160                                         if (dist < abs(obji_64)) {
 161                                                 if (dist < MIN_LIGHT_DIST)
 162                                                         dist = MIN_LIGHT_DIST;
 163
 164                                                 Dynamic_light[vertnum] += fixdiv(obj_intensity, dist);
 165                                         }
 166                                 }
 167                         }
 168                 } else {
 169                         int     headlight_shift = 0;
 170                         fix     max_headlight_dist = F1_0*200;
 171
 172                         if (Objects[objnum].type == OBJ_PLAYER)
 173                                 if (Players[Objects[objnum].id].flags & PLAYER_FLAGS_HEADLIGHT_ON) {
 174                                         headlight_shift = 3;
 175                                         if (Objects[objnum].id != Player_num) {
 176                                                 vms_vector      tvec;
 177                                                 fvi_query       fq;
 178                                                 fvi_info                hit_data;
 179                                                 int                     fate;
 180
 181                                                 vm_vec_scale_add(&tvec, &Objects[objnum].pos, &Objects[objnum].orient.fvec, F1_0*200);
 182
 183                                                 fq.startseg                             = Objects[objnum].segnum;
 184                                                 fq.p0                                           = &Objects[objnum].pos;
 185                                                 fq.p1                                           = &tvec;
 186                                                 fq.rad                                  = 0;
 187                                                 fq.thisobjnum                   = objnum;
 188                                                 fq.ignore_obj_list      = NULL;
 189                                                 fq.flags                                        = FQ_TRANSWALL;
 190
 191                                                 fate = find_vector_intersection(&fq, &hit_data);
 192                                                 if (fate != HIT_NONE)
 193                                                         max_headlight_dist = vm_vec_mag_quick(vm_vec_sub(&tvec, &hit_data.hit_pnt, &Objects[objnum].pos)) + F1_0*4;
 194                                         }
 195                                 }
 196                         // -- for (vv=FrameCount&1; vv<n_render_vertices; vv+=2) {
 197                         for (vv=0; vv<n_render_vertices; vv++) {
 198                                 int                     vertnum;
 199                                 vms_vector      *vertpos;
 200                                 fix                     dist;
 201                                 int                     apply_light;
 202
 203                                 vertnum = render_vertices[vv];
 204                                 if ((vertnum ^ FrameCount) & 1) {
 205                                         vertpos = &Vertices[vertnum];
 206                                         dist = vm_vec_dist_quick(obj_pos, vertpos);
 207                                         apply_light = 0;
 208
 209                                         if ((dist >> headlight_shift) < abs(obji_64)) {
 210
 211                                                 if (dist < MIN_LIGHT_DIST)
 212                                                         dist = MIN_LIGHT_DIST;
 213
 214                                                 //if (Use_fvi_lighting) {
 215                                                 //      if (lighting_cache_visible(vertnum, obj_seg, objnum, obj_pos, obj_seg, vertpos)) {
 216                                                 //              apply_light = 1;
 217                                                 //      }
 218                                                 //} else
 219                                                         apply_light = 1;
 220
 221                                                 if (apply_light) {
 222                                                         if (headlight_shift) {
 223                                                                 fix                     dot;
 224                                                                 vms_vector      vec_to_point;
 225
 226                                                                 vm_vec_sub(&vec_to_point, vertpos, obj_pos);
 227                                                                 vm_vec_normalize_quick(&vec_to_point);          //      MK, Optimization note: You compute distance about 15 lines up, this is partially redundant
 228                                                                 dot = vm_vec_dot(&vec_to_point, &Objects[objnum].orient.fvec);
 229                                                                 if (dot < F1_0/2)
 230                                                                         Dynamic_light[vertnum] += fixdiv(obj_intensity, fixmul(HEADLIGHT_SCALE, dist)); //      Do the normal thing, but darken around headlight.
 231                                                                 else {
 232                                                                         if (Game_mode & GM_MULTI) {
 233                                                                                 if (dist < max_headlight_dist)
 234                                                                                         Dynamic_light[vertnum] += fixmul(fixmul(dot, dot), obj_intensity)/8;
 235                                                                         } else
 236                                                                                 Dynamic_light[vertnum] += fixmul(fixmul(dot, dot), obj_intensity)/8;
 237                                                                 }
 238                                                         } else
 239                                                                 Dynamic_light[vertnum] += fixdiv(obj_intensity, dist);
 240                                                 }
 241                                         }
 242                                 }
 243                         }
 244                 }
 245         }
 246 }
 247
 248 #define FLASH_LEN_FIXED_SECONDS (F1_0/3)
 249 #define FLASH_SCALE                                     (3*F1_0/FLASH_LEN_FIXED_SECONDS)
 250
 251 // ----------------------------------------------------------------------------------------------
 252 void cast_muzzle_flash_light(int n_render_vertices, short *render_vertices)
 253 {
 254         fix current_time;
 255         int     i;
 256         short   time_since_flash;
 257
 258         current_time = timer_get_fixed_seconds();
 259
 260         for (i=0; i<MUZZLE_QUEUE_MAX; i++) {
 261                 if (Muzzle_data[i].create_time) {
 262                         time_since_flash = current_time - Muzzle_data[i].create_time;
 263                         if (time_since_flash < FLASH_LEN_FIXED_SECONDS)
 264                                 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);
 265                         else
 266                                 Muzzle_data[i].create_time = 0;         // turn off this muzzle flash
 267                 }
 268         }
 269 }
 270
 271 //      Translation table to make flares flicker at different rates
 272 fix     Obj_light_xlate[16] =
 273         {0x1234, 0x3321, 0x2468, 0x1735,
 274          0x0123, 0x19af, 0x3f03, 0x232a,
 275          0x2123, 0x39af, 0x0f03, 0x132a,
 276          0x3123, 0x29af, 0x1f03, 0x032a};
 277
 278 //      Flag array of objects lit last frame.  Guaranteed to process this frame if lit last frame.
 279 sbyte   Lighting_objects[MAX_OBJECTS];
 280
 281 #define MAX_HEADLIGHTS  8
 282 object  *Headlights[MAX_HEADLIGHTS];
 283 int             Num_headlights;
 284
 285 // ---------------------------------------------------------
 286 fix compute_light_intensity(int objnum)
 287 {
 288         object          *obj = &Objects[objnum];
 289         int                     objtype = obj->type;
 290    fix hoardlight,s;
 291
 292         switch (objtype) {
 293                 case OBJ_PLAYER:
 294                          if (Players[obj->id].flags & PLAYER_FLAGS_HEADLIGHT_ON) {
 295                                 if (Num_headlights < MAX_HEADLIGHTS)
 296                                         Headlights[Num_headlights++] = obj;
 297                                 return HEADLIGHT_SCALE;
 298                          } else if ((Game_mode & GM_HOARD) && Players[obj->id].secondary_ammo[PROXIMITY_INDEX]) {
 299
 300                    // If hoard game and player, add extra light based on how many orbs you have
 301                         // Pulse as well.
 302
 303                            hoardlight=i2f(Players[obj->id].secondary_ammo[PROXIMITY_INDEX])/2; //i2f(12));
 304                                 hoardlight++;
 305                       fix_sincos ((GameTime/2) & 0xFFFF,&s,NULL); // probably a bad way to do it
 306                            s+=F1_0;
 307                                 s>>=1;
 308                            hoardlight=fixmul (s,hoardlight);
 309                  //     mprintf ((0,"Hoardlight is %f!\n",f2fl(hoardlight)));
 310                       return (hoardlight);
 311                           }
 312                         else
 313                                 return max(vm_vec_mag_quick(&obj->mtype.phys_info.thrust)/4, F1_0*2) + F1_0/2;
 314                         break;
 315                 case OBJ_FIREBALL:
 316                         if (obj->id != 0xff) {
 317                                 if (obj->lifeleft < F1_0*4)
 318                                         return fixmul(fixdiv(obj->lifeleft, Vclip[obj->id].play_time), Vclip[obj->id].light_value);
 319                                 else
 320                                         return Vclip[obj->id].light_value;
 321                         } else
 322                                  return 0;
 323                         break;
 324                 case OBJ_ROBOT:
 325                         return F1_0*Robot_info[obj->id].lightcast;
 326                         break;
 327                 case OBJ_WEAPON: {
 328                         fix tval = Weapon_info[obj->id].light;
 329                         if (Game_mode & GM_MULTI)
 330                                 if (obj->id == OMEGA_ID)
 331                                         if (d_rand() > 8192)
 332                                                 return 0;               //      3/4 of time, omega blobs will cast 0 light!
 333
 334                         if (obj->id == FLARE_ID )
 335                                 return 2* (min(tval, obj->lifeleft) + ((GameTime ^ Obj_light_xlate[objnum&0x0f]) & 0x3fff));
 336                         else
 337                                 return tval;
 338                 }
 339
 340                 case OBJ_MARKER: {
 341                         fix     lightval = obj->lifeleft;
 342
 343                         lightval &= 0xffff;
 344
 345                         lightval = 8 * abs(F1_0/2 - lightval);
 346
 347                         if (obj->lifeleft < F1_0*1000)
 348                                 obj->lifeleft += F1_0;  //      Make sure this object doesn't go out.
 349
 350                         return lightval;
 351                 }
 352
 353                 case OBJ_POWERUP:
 354                         return Powerup_info[obj->id].light;
 355                         break;
 356                 case OBJ_DEBRIS:
 357                         return F1_0/4;
 358                         break;
 359                 case OBJ_LIGHT:
 360                         return obj->ctype.light_info.intensity;
 361                         break;
 362                 default:
 363                         return 0;
 364                         break;
 365         }
 366 }
 367
 368 // ----------------------------------------------------------------------------------------------
 369 void set_dynamic_light(void)
 370 {
 371         int     vv;
 372         int     objnum;
 373         int     n_render_vertices;
 374         short   render_vertices[MAX_VERTICES];
 375         sbyte   render_vertex_flags[MAX_VERTICES];
 376         int     render_seg,segnum, v;
 377         sbyte   new_lighting_objects[MAX_OBJECTS];
 378
 379         Num_headlights = 0;
 380
 381         if (!Do_dynamic_light)
 382                 return;
 383
 384 //if (Use_fvi_lighting)
 385 //      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));
 386
 387         memset(render_vertex_flags, 0, Highest_vertex_index+1);
 388
 389         //      Create list of vertices that need to be looked at for setting of ambient light.
 390         n_render_vertices = 0;
 391         for (render_seg=0; render_seg<N_render_segs; render_seg++) {
 392                 segnum = Render_list[render_seg];
 393                 if (segnum != -1) {
 394                         short   *vp = Segments[segnum].verts;
 395                         for (v=0; v<MAX_VERTICES_PER_SEGMENT; v++) {
 396                                 int     vnum = vp[v];
 397                                 if (vnum<0 || vnum>Highest_vertex_index) {
 398                                         Int3();         //invalid vertex number
 399                                         continue;       //ignore it, and go on to next one
 400                                 }
 401                                 if (!render_vertex_flags[vnum]) {
 402                                         render_vertex_flags[vnum] = 1;
 403                                         render_vertices[n_render_vertices++] = vnum;
 404                                 }
 405                                 //--old way-- for (s=0; s<n_render_vertices; s++)
 406                                 //--old way--   if (render_vertices[s] == vnum)
 407                                 //--old way--           break;
 408                                 //--old way-- if (s == n_render_vertices)
 409                                 //--old way--   render_vertices[n_render_vertices++] = vnum;
 410                         }
 411                 }
 412         }
 413
 414         // -- for (vertnum=FrameCount&1; vertnum<n_render_vertices; vertnum+=2) {
 415         for (vv=0; vv<n_render_vertices; vv++) {
 416                 int     vertnum;
 417
 418                 vertnum = render_vertices[vv];
 419                 Assert(vertnum >= 0 && vertnum <= Highest_vertex_index);
 420                 if ((vertnum ^ FrameCount) & 1)
 421                         Dynamic_light[vertnum] = 0;
 422         }
 423
 424         cast_muzzle_flash_light(n_render_vertices, render_vertices);
 425
 426         for (objnum=0; objnum<=Highest_object_index; objnum++)
 427                 new_lighting_objects[objnum] = 0;
 428
 429         //      July 5, 1995: New faster dynamic lighting code.  About 5% faster on the PC (un-optimized).
 430         //      Only objects which are in rendered segments cast dynamic light.  We might wad6 to extend this
 431         //      one or two segments if we notice light changing as objects go offscreen.  I couldn't see any
 432         //      serious visual degradation.  In fact, I could see no humorous degradation, either. --MK
 433         for (render_seg=0; render_seg<N_render_segs; render_seg++) {
 434                 int     segnum = Render_list[render_seg];
 435
 436                 objnum = Segments[segnum].objects;
 437
 438                 while (objnum != -1) {
 439                         object          *obj = &Objects[objnum];
 440                         vms_vector      *objpos = &obj->pos;
 441                         fix                     obj_intensity;
 442
 443                         obj_intensity = compute_light_intensity(objnum);
 444
 445                         if (obj_intensity) {
 446                                 apply_light(obj_intensity, obj->segnum, objpos, n_render_vertices, render_vertices, obj-Objects);
 447                                 new_lighting_objects[objnum] = 1;
 448                         }
 449
 450                         objnum = obj->next;
 451                 }
 452         }
 453
 454         //      Now, process all lights from last frame which haven't been processed this frame.
 455         for (objnum=0; objnum<=Highest_object_index; objnum++) {
 456                 //      In multiplayer games, process even unprocessed objects every 4th frame, else don't know about player sneaking up.
 457                 if ((Lighting_objects[objnum]) || ((Game_mode & GM_MULTI) && (((objnum ^ FrameCount) & 3) == 0))) {
 458                         if (!new_lighting_objects[objnum]) {
 459                                 //      Lighted last frame, but not this frame.  Get intensity...
 460                                 object          *obj = &Objects[objnum];
 461                                 vms_vector      *objpos = &obj->pos;
 462                                 fix                     obj_intensity;
 463
 464                                 obj_intensity = compute_light_intensity(objnum);
 465
 466                                 if (obj_intensity) {
 467                                         apply_light(obj_intensity, obj->segnum, objpos, n_render_vertices, render_vertices, objnum);
 468                                         Lighting_objects[objnum] = 1;
 469                                 } else
 470                                         Lighting_objects[objnum] = 0;
 471                         }
 472                 } else {
 473                         //      Not lighted last frame, so we don't need to light it.  (Already lit if casting light this frame.)
 474                         //      But copy value from new_lighting_objects to update Lighting_objects array.
 475                         Lighting_objects[objnum] = new_lighting_objects[objnum];
 476                 }
 477         }
 478 }
 479
 480 // ---------------------------------------------------------
 481
 482 void toggle_headlight_active()
 483 {
 484         if (Players[Player_num].flags & PLAYER_FLAGS_HEADLIGHT) {
 485                 Players[Player_num].flags ^= PLAYER_FLAGS_HEADLIGHT_ON;
 486 #ifdef NETWORK
 487                 if (Game_mode & GM_MULTI)
 488                         multi_send_flags(Player_num);
 489 #endif
 490         }
 491 }
 492
 493 #define HEADLIGHT_BOOST_SCALE 8         //how much to scale light when have headlight boost
 494
 495 fix     Beam_brightness = (F1_0/2);     //global saying how bright the light beam is
 496
 497 #define MAX_DIST_LOG    6                                                       //log(MAX_DIST-expressed-as-integer)
 498 #define MAX_DIST                (f1_0<<MAX_DIST_LOG)    //no light beyond this dist
 499
 500 fix compute_headlight_light_on_object(object *objp)
 501 {
 502         int     i;
 503         fix     light;
 504
 505         //      Let's just illuminate players and robots for speed reasons, ok?
 506         if ((objp->type != OBJ_ROBOT) && (objp->type    != OBJ_PLAYER))
 507                 return 0;
 508
 509         light = 0;
 510
 511         for (i=0; i<Num_headlights; i++) {
 512                 fix                     dot, dist;
 513                 vms_vector      vec_to_obj;
 514                 object          *light_objp;
 515
 516                 light_objp = Headlights[i];
 517
 518                 vm_vec_sub(&vec_to_obj, &objp->pos, &light_objp->pos);
 519                 dist = vm_vec_normalize_quick(&vec_to_obj);
 520                 if (dist > 0) {
 521                         dot = vm_vec_dot(&light_objp->orient.fvec, &vec_to_obj);
 522
 523                         if (dot < F1_0/2)
 524                                 light += fixdiv(HEADLIGHT_SCALE, fixmul(HEADLIGHT_SCALE, dist));        //      Do the normal thing, but darken around headlight.
 525                         else
 526                                 light += fixmul(fixmul(dot, dot), HEADLIGHT_SCALE)/8;
 527                 }
 528         }
 529
 530         return light;
 531 }
 532
 533
 534 // -- Unused -- //Compute the lighting from the headlight for a given vertex on a face.
 535 // -- Unused -- //Takes:
 536 // -- Unused -- //  point - the 3d coords of the point
 537 // -- Unused -- //  face_light - a scale factor derived from the surface normal of the face
 538 // -- Unused -- //If no surface normal effect is wanted, pass F1_0 for face_light
 539 // -- Unused -- fix compute_headlight_light(vms_vector *point,fix face_light)
 540 // -- Unused -- {
 541 // -- Unused --         fix light;
 542 // -- Unused --         int use_beam = 0;               //flag for beam effect
 543 // -- Unused --
 544 // -- Unused --         light = Beam_brightness;
 545 // -- Unused --
 546 // -- 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) {
 547 // -- Unused --                 light *= HEADLIGHT_BOOST_SCALE;
 548 // -- Unused --                 use_beam = 1;   //give us beam effect
 549 // -- Unused --         }
 550 // -- Unused --
 551 // -- Unused --         if (light) {                            //if no beam, don't bother with the rest of this
 552 // -- Unused --                 fix point_dist;
 553 // -- Unused --
 554 // -- Unused --                 point_dist = vm_vec_mag_quick(point);
 555 // -- Unused --
 556 // -- Unused --                 if (point_dist >= MAX_DIST)
 557 // -- Unused --
 558 // -- Unused --                         light = 0;
 559 // -- Unused --
 560 // -- Unused --                 else {
 561 // -- Unused --                         fix dist_scale,face_scale;
 562 // -- Unused --
 563 // -- Unused --                         dist_scale = (MAX_DIST - point_dist) >> MAX_DIST_LOG;
 564 // -- Unused --                         light = fixmul(light,dist_scale);
 565 // -- Unused --
 566 // -- Unused --                         if (face_light < 0)
 567 // -- Unused --                                 face_light = 0;
 568 // -- Unused --
 569 // -- Unused --                         face_scale = f1_0/4 + face_light/2;
 570 // -- Unused --                         light = fixmul(light,face_scale);
 571 // -- Unused --
 572 // -- Unused --                         if (use_beam) {
 573 // -- Unused --                                 fix beam_scale;
 574 // -- Unused --
 575 // -- Unused --                                 if (face_light > f1_0*3/4 && point->z > i2f(12)) {
 576 // -- Unused --                                         beam_scale = fixdiv(point->z,point_dist);
 577 // -- Unused --                                         beam_scale = fixmul(beam_scale,beam_scale);     //square it
 578 // -- Unused --                                         light = fixmul(light,beam_scale);
 579 // -- Unused --                                 }
 580 // -- Unused --                         }
 581 // -- Unused --                 }
 582 // -- Unused --         }
 583 // -- Unused --
 584 // -- Unused --         return light;
 585 // -- Unused -- }
 586
 587 //compute the average dynamic light in a segment.  Takes the segment number
 588 fix compute_seg_dynamic_light(int segnum)
 589 {
 590         fix sum;
 591         segment *seg;
 592         short *verts;
 593
 594         seg = &Segments[segnum];
 595
 596         verts = seg->verts;
 597         sum = 0;
 598
 599         sum += Dynamic_light[*verts++];
 600         sum += Dynamic_light[*verts++];
 601         sum += Dynamic_light[*verts++];
 602         sum += Dynamic_light[*verts++];
 603         sum += Dynamic_light[*verts++];
 604         sum += Dynamic_light[*verts++];
 605         sum += Dynamic_light[*verts++];
 606         sum += Dynamic_light[*verts];
 607
 608         return sum >> 3;
 609
 610 }
 611
 612 fix object_light[MAX_OBJECTS];
 613 int object_sig[MAX_OBJECTS];
 614 object *old_viewer;
 615 int reset_lighting_hack;
 616
 617 #define LIGHT_RATE i2f(4)               //how fast the light ramps up
 618
 619 void start_lighting_frame(object *viewer)
 620 {
 621         reset_lighting_hack = (viewer != old_viewer);
 622
 623         old_viewer = viewer;
 624 }
 625
 626 //compute the lighting for an object.  Takes a pointer to the object,
 627 //and possibly a rotated 3d point.  If the point isn't specified, the
 628 //object's center point is rotated.
 629 fix compute_object_light(object *obj,vms_vector *rotated_pnt)
 630 {
 631         fix light;
 632         g3s_point objpnt;
 633         int objnum = obj-Objects;
 634
 635         if (!rotated_pnt) {
 636                 g3_rotate_point(&objpnt,&obj->pos);
 637                 rotated_pnt = &objpnt.p3_vec;
 638         }
 639
 640         //First, get static light for this segment
 641
 642         light = Segment2s[obj->segnum].static_light;
 643
 644         //return light;
 645
 646
 647         //Now, maybe return different value to smooth transitions
 648
 649         if (!reset_lighting_hack && object_sig[objnum] == obj->signature) {
 650                 fix delta_light,frame_delta;
 651
 652                 delta_light = light - object_light[objnum];
 653
 654                 frame_delta = fixmul(LIGHT_RATE,FrameTime);
 655
 656                 if (abs(delta_light) <= frame_delta)
 657
 658                         object_light[objnum] = light;           //we've hit the goal
 659
 660                 else
 661
 662                         if (delta_light < 0)
 663                                 light = object_light[objnum] -= frame_delta;
 664                         else
 665                                 light = object_light[objnum] += frame_delta;
 666
 667         }
 668         else {          //new object, initialize
 669
 670                 object_sig[objnum] = obj->signature;
 671                 object_light[objnum] = light;
 672         }
 673
 674
 675
 676         //Next, add in headlight on this object
 677
 678         // -- Matt code: light += compute_headlight_light(rotated_pnt,f1_0);
 679         light += compute_headlight_light_on_object(obj);
 680
 681         //Finally, add in dynamic light for this segment
 682
 683         light += compute_seg_dynamic_light(obj->segnum);
 684
 685
 686         return light;
 687 }
 688
 689