src/hud/hudlock.cpp

   1 /*
   2  * $Logfile: /Freespace2/code/Hud/HUDlock.cpp $
   3  * $Revision$
   4  * $Date$
   5  * $Author$
   6  *
   7  * C module that controls missile locking
   8  *
   9  * $Log$
  10  * Revision 1.3  2002/05/31 07:24:28  relnev
  11  * warning
  12  *
  13  * Revision 1.2  2002/05/07 03:16:45  theoddone33
  14  * The Great Newline Fix
  15  *
  16  * Revision 1.1.1.1  2002/05/03 03:28:09  root
  17  * Initial import.
  18  *
  19  *
  20  * 19    8/09/99 10:50a Jasenw
  21  *
  22  * 18    7/30/99 5:42p Jasenw
  23  * changed coords to center HUD lock indicator.
  24  *
  25  * 17    7/28/99 2:49p Andsager
  26  * Make hud target speed use vm_vec_mag (not vm_vec_mag_quick)
  27  *
  28  * 16    6/08/99 7:41p Dave
  29  * Animated hud lockup icon a bit differently.
  30  *
  31  * 15    6/08/99 8:35a Jasenw
  32  * new coords for new lock ani
  33  *
  34  * 14    6/07/99 4:20p Andsager
  35  * Add HUD color for tagged object.  Apply to target and radar.
  36  *
  37  * 13    6/07/99 1:42p Jasenw
  38  *
  39  * 12    6/04/99 10:58a Dave
  40  * Updated hud lock gauge.
  41  *
  42  * 11    6/03/99 2:32p Jasenw
  43  * changed coords for new HUD stuff
  44  *
  45  * 10    6/02/99 5:41p Andsager
  46  * Reduce range of secondary weapons not fired from turrets in nebula.
  47  * Reduce range of beams fired from turrrets in nebula
  48  *
  49  * 9     4/23/99 12:01p Johnson
  50  * Added SIF_HUGE_SHIP
  51  *
  52  * 8     2/25/99 4:19p Dave
  53  * Added multiplayer_beta defines. Added cd_check define. Fixed a few
  54  * release build warnings. Added more data to the squad war request and
  55  * response packets.
  56  *
  57  * 7     1/07/99 9:07a Jasen
  58  * HUD coords
  59  *
  60  * 6     12/30/98 7:47a Jasen
  61  * added coordinates for hi res
  62  *
  63  * 5     12/28/98 3:17p Dave
  64  * Support for multiple hud bitmap filenames for hi-res mode.
  65  *
  66  * 4     12/21/98 5:02p Dave
  67  * Modified all hud elements to be multi-resolution friendly.
  68  *
  69  * 3     11/05/98 5:55p Dave
  70  * Big pass at reducing #includes
  71  *
  72  * 2     10/07/98 10:53a Dave
  73  * Initial checkin.
  74  *
  75  * 1     10/07/98 10:49a Dave
  76  *
  77  * 55    8/25/98 1:48p Dave
  78  * First rev of EMP effect. Player side stuff basically done. Next comes
  79  * AI code.
  80  *
  81  * 54    5/11/98 3:48p Lawrance
  82  * Break lock when banks switch
  83  *
  84  * 53    5/10/98 7:05p Dave
  85  * Fix endgame sequencing ESC key. Changed how host options warning popups
  86  * are done. Fixed pause/message scrollback/options screen problems in mp.
  87  * Make sure observer HUD doesn't try to lock weapons.
  88  *
  89  * 52    5/04/98 10:50p Lawrance
  90  * Don't break lock when switching to secondary weapons of the same type
  91  *
  92  * 51    4/20/98 12:36a Mike
  93  * Make team vs. team work when player is hostile.  Several targeting
  94  * problems.
  95  *
  96  * 50    4/15/98 12:55a Lawrance
  97  * Make shockwave damage 1/4 if bomb detonated by another weapon.  Allow
  98  * missiles to lock on bombs.
  99  *
 100  * 49    4/13/98 4:52p Allender
 101  * remove AI_frametime and us flFrametime instead.  Make lock warning work
 102  * in multiplayer for aspect seeking missiles.  Debris fixups
 103  *
 104  * 48    4/08/98 8:33p Lawrance
 105  * Make player re-acquire lock when targeting subsystems on a locked ship.
 106  *
 107  * 47    4/03/98 10:29a Mike
 108  * Make aspect seekers home on a ship even if the targeted subsystem is
 109  * backfacing.  Too confusing.
 110  *
 111  * 46    3/26/98 5:46p Lawrance
 112  * call obj_team() instead of ship_team_from_obj()
 113  *
 114  * 45    3/26/98 5:26p John
 115  * added new paging code. nonfunctional.
 116  *
 117  * 44    3/10/98 4:19p John
 118  * Cleaned up graphics lib.  Took out most unused gr functions.   Made D3D
 119  * & Glide have popups and print screen.  Took out all >8bpp software
 120  * support.  Made Fred zbuffer.  Made zbuffer allocate dynamically to
 121  * support Fred.  Made zbuffering key off of functions rather than one
 122  * global variable.
 123  *
 124  * 43    3/10/98 11:16a Lawrance
 125  * Fix potential bug with missles not locking on a subsystem that appeared
 126  * in view
 127  *
 128  * 42    2/28/98 7:03p Lawrance
 129  * Change player missile locking to use dot product, so we can use it in
 130  * the external views
 131  *
 132  * 41    2/22/98 4:17p John
 133  * More string externalization classification... 190 left to go!
 134  *
 135  * 40    1/25/98 10:31p Lawrance
 136  * Don't draw most hud gauges when viewing from another ship.
 137  *
 138  * 39    1/24/98 4:48p Lawrance
 139  * Add 'locking_subsys_parent', needed to save/restore locking_subsys
 140  * pointer.
 141  *
 142  * 38    1/23/98 6:25p Lawrance
 143  * Change player missile locking to lock on subsystem points automatically
 144  *
 145  * 37    1/21/98 7:20p Lawrance
 146  * Make subsystem locking only work with line-of-sight, cleaned up locking
 147  * code, moved globals to player struct.
 148  *
 149  * 36    1/19/98 10:02p Lawrance
 150  * Fix bug with locking on friendlies
 151  *
 152  * 35    12/30/97 4:28p Lawrance
 153  * remove .ani extensions from filenames
 154  *
 155  * 34    12/10/97 9:57a Lawrance
 156  * allow missile locks on all ships but friendly
 157  *
 158  * 33    11/17/97 6:37p Lawrance
 159  * new gauges: extended target view, new lock triangles, support ship view
 160  *
 161  * 32    11/17/97 5:51p Lawrance
 162  * fix bug that was sometimes causing lock to not occur
 163  *
 164  * 31    11/13/97 10:46p Lawrance
 165  * ensure only attempt lock on HOSTILE
 166  *
 167  * 30    11/11/97 12:59a Lawrance
 168  * fix couple of bugs with lock indicator not going away
 169  *
 170  * 29    11/08/97 11:07p Lawrance
 171  * add in new lock indicator
 172  *
 173  * 28    10/28/97 9:02a Lawrance
 174  * don't loop lock sound, some minor reformatting
 175  *
 176  * 27    10/08/97 5:07p Lawrance
 177  * don't lock on friendly ships
 178  *
 179  * 26    9/07/97 10:02p Lawrance
 180  * don't lock on a ship if player doesn't have any missiles
 181  *
 182  * 25    7/02/97 9:35a Hoffoss
 183  * Changed all references to weapon variables in ships to 'weapons'
 184  * structure variables in ships.
 185  *
 186  * 24    6/05/97 1:07a Lawrance
 187  * changes to support sound interface
 188  *
 189  * 23    5/20/97 2:45p Mike
 190  * Move current_target and a bunch of other stuff out of player struct.
 191  *
 192  * 22    4/24/97 10:55a Lawrance
 193  * added Show_lock_cone to DCF
 194  *
 195  * 21    4/18/97 2:54p Lawrance
 196  * sounds now have a default volume, when playing, pass a scaling factor
 197  * not the actual volume
 198  *
 199  * 20    4/15/97 8:36a Lawrance
 200  * fixed bug where lock indicator was lagging locked target
 201  *
 202  * 19    4/13/97 3:53p Lawrance
 203  * separate out the non-rendering dependant portions of the HUD ( sounds,
 204  * updating lock position, changing targets, etc) and put into
 205  * hud_update_frame()
 206  *
 207  * 18    4/12/97 4:29p Lawrance
 208  * get missle locking and offscreen indicator working properly with
 209  * different sized screens
 210  *
 211  * 17    4/10/97 5:29p Lawrance
 212  * hud rendering split up into hud_render_3d(), hud_render_2d() and
 213  * hud_render_target_model()
 214  *
 215  * 16    4/09/97 4:34p Lawrance
 216  * allow looped sounds to be cut off after they complete the full sample
 217  * duration
 218  *
 219  * 15    3/25/97 8:17p Lawrance
 220  * don't allow ASPECT homing missles to lock on debris
 221  *
 222  * 14    3/19/97 5:53p Lawrance
 223  * integrating new Misc_sounds[] array (replaces old Game_sounds
 224  * structure)
 225  *
 226  * 13    3/10/97 8:53a Lawrance
 227  * using hud_stop_looped_locking_sounds() in place of
 228  * hud_stop_looped_sounds()
 229  *
 230  * 12    3/07/97 4:37p Mike
 231  * Make rockeye missile home.
 232  * Remove UNKNOWN and NEUTRAL teams.
 233  *
 234  * 11    3/04/97 2:27p Lawrance
 235  * check to ensure player ship has missile banks
 236  *
 237  * 10    3/04/97 11:19a Lawrance
 238  * supporting banked weapons
 239  *
 240  * 9     1/23/97 12:00p Lawrance
 241  * made lock sound play at normal volume.
 242  *
 243  * 8     1/20/97 7:58p John
 244  * Fixed some link errors with testcode.
 245  *
 246  * 7     1/13/97 5:36p Lawrance
 247  * integrating new Game_sounds structure for general game sounds
 248  *
 249  * 6     1/06/97 10:43p Lawrance
 250  * Changes to make save/restore functional
 251  *
 252  * 5     1/02/97 7:12p Lawrance
 253  * adding hooks for more sounds
 254  *
 255  * 4     1/02/97 10:32a Lawrance
 256  * fixed some bugs related to stopping looped sounds when targets die and
 257  * going to menus
 258  *
 259  * 3     12/24/96 4:32p Lawrance
 260  * some minor improvements
 261  *
 262  * 2     12/23/96 7:53p Lawrance
 263  * missile locking working in new source files
 264  *
 265  * $NoKeywords: $
 266  */
 267
 268 #include "hud.h"
 269 #include "hudlock.h"
 270 #include "hudtarget.h"
 271 #include "hudreticle.h"
 272 #include "player.h"
 273 #include "ship.h"
 274 #include "weapon.h"
 275 #include "sound.h"
 276 #include "timer.h"
 277 #include "freespace.h"
 278 #include "gamesequence.h"
 279 #include "gamesnd.h"
 280 #include "ai.h"
 281 #include "bmpman.h"
 282 #include "3d.h"
 283 #include "linklist.h"
 284 #include "multi.h"
 285 #include "emp.h"
 286
 287
 288 static float Lock_start_dist;
 289 static int Rotate_time_id = 1;  // timer id for controlling how often to rotate triangles around lock indicator
 290
 291 int Missile_track_loop = -1;
 292 int Missile_lock_loop = -1;
 293
 294 int Lock_target_box_width[GR_NUM_RESOLUTIONS] = {
 295         19,
 296         30
 297 };
 298 int Lock_target_box_height[GR_NUM_RESOLUTIONS] = {
 299         19,
 300         30
 301 };
 302
 303 // the locked triangles (that orbit lock indicator) dimensions
 304 float Lock_triangle_base[GR_NUM_RESOLUTIONS] = {
 305         4.0f,
 306         6.5f
 307 };
 308 float Lock_triangle_height[GR_NUM_RESOLUTIONS] = {
 309         4.0f,
 310         6.5f
 311 };
 312
 313 int Lock_gauge_half_w[GR_NUM_RESOLUTIONS] = {
 314         17,
 315         28
 316 };
 317 int Lock_gauge_half_h[GR_NUM_RESOLUTIONS] = {
 318         15,
 319         25
 320 };
 321
 322 // hud_frames Lock_gauge;
 323 int Lock_gauge_loaded = 0;
 324 hud_anim Lock_gauge;
 325 int Lock_gauge_draw = 0;
 326 int Lock_gauge_draw_stamp = -1;
 327 #define LOCK_GAUGE_BLINK_RATE                   5                       // blinks/sec
 328
 329 int Lockspin_half_w[GR_NUM_RESOLUTIONS] = {
 330         31,
 331         50
 332 };
 333 int Lockspin_half_h[GR_NUM_RESOLUTIONS] = {
 334         32,
 335         52
 336 };
 337 hud_anim        Lock_anim;
 338
 339 char Lock_fname[GR_NUM_RESOLUTIONS][MAX_FILENAME_LEN] = {
 340         "lock1",
 341         "2_lock1"
 342 };
 343
 344 char Lockspin_fname[GR_NUM_RESOLUTIONS][MAX_FILENAME_LEN] = {
 345         "lockspin",
 346         "2_lockspin"
 347 };
 348
 349 void hud_lock_determine_lock_point(vector *lock_world_pos_out);
 350
 351 // hud_init_missile_lock() is called at the beginning of a mission
 352 //
 353 void hud_init_missile_lock()
 354 {
 355         Players[Player_num].lock_indicator_start_x = -1;
 356         Players[Player_num].lock_indicator_start_y = -1;
 357         Players[Player_num].lock_indicator_visible = 0;
 358         Player_ai->current_target_is_locked = 0;
 359
 360         Player_ai->last_secondary_index = -1;
 361
 362         Rotate_time_id = 1;
 363
 364         // Load in the frames need for the lead indicator
 365         if (!Lock_gauge_loaded) {
 366                 /*
 367                 Lock_gauge.first_frame = bm_load_animation(Lock_fname[gr_screen.res], &Lock_gauge.num_frames);
 368                 if ( Lock_gauge.first_frame < 0 ) {
 369                         Warning(LOCATION,"Cannot load hud ani: Lock_fname[gr_screen.res]\n");
 370                 }
 371                 */
 372                 hud_anim_init(&Lock_gauge, 0, 0, Lock_fname[gr_screen.res]);
 373                 hud_anim_load(&Lock_gauge);
 374
 375                 hud_anim_init(&Lock_anim, 0, 0, Lockspin_fname[gr_screen.res]);
 376                 hud_anim_load(&Lock_anim);
 377
 378                 Lock_gauge_loaded = 1;
 379
 380                 Lock_gauge_draw_stamp = -1;
 381                 Lock_gauge_draw = 0;
 382         }
 383 }
 384
 385 void hud_draw_diamond(int x, int y, int width, int height)
 386 {
 387         Assert(height>0);
 388         Assert(width>0);
 389
 390         int x1,x2,x3,x4,y1,y2,y3,y4;
 391
 392         x1=x;
 393         y1=y-height/2;
 394
 395         x2=x+width/2;
 396         y2=y;
 397
 398         x3=x;
 399         y3=y+height/2;
 400
 401         x4=x-width/2;
 402         y4=y;
 403
 404         gr_line(x1,y1,x2,y2);
 405         gr_line(x2,y2,x3,y3);
 406         gr_line(x3,y3,x4,y4);
 407         gr_line(x4,y4,x1,y1);
 408 }
 409
 410
 411 // hud_show_lock_indicator() will display the lock indicator for homing missiles
 412 void hud_show_lock_indicator(float frametime)
 413 {
 414         int                     target_objnum, sx, sy;
 415         object          *targetp;
 416
 417         if (!Players[Player_num].lock_indicator_visible){
 418                 return;
 419         }
 420
 421         target_objnum = Player_ai->target_objnum;
 422         Assert(target_objnum != -1);
 423         targetp = &Objects[target_objnum];
 424
 425         // check to see if there are any missile to fire.. we don't want to show the
 426         // lock indicator if there are missiles to fire.
 427         if ( !ship_secondary_bank_has_ammo(Player_obj->instance) ) {
 428                 return;
 429         }
 430
 431         hud_set_iff_color(targetp);
 432 //      nprintf(("Alan","lockx: %d, locky: %d TargetX: %d, TargetY: %d\n", Players[Player_num].lock_indicator_x, Players[Player_num].lock_indicator_y, Player->current_target_sx, Player->current_target_sy));
 433
 434         if (Player_ai->current_target_is_locked) {
 435                 sx = Player->current_target_sx;
 436                 sy = Player->current_target_sy;
 437                 // show the rotating triangles if target is locked
 438                 hud_draw_lock_triangles(sx, sy, frametime);
 439         } else {
 440                 sx = Players[Player_num].lock_indicator_x;
 441                 sy = Players[Player_num].lock_indicator_y;
 442         }
 443
 444         // show locked indicator
 445         /*
 446         if ( Lock_gauge.first_frame >= 0 ) {
 447                 gr_set_bitmap(Lock_gauge.first_frame);
 448                 gr_aabitmap(sx - Lock_gauge_half_w[gr_screen.res], sy - Lock_gauge_half_h[gr_screen.res]);
 449         } else {
 450                 hud_draw_diamond(sx, sy, Lock_target_box_width[gr_screen.res], Lock_target_box_height[gr_screen.res]);
 451         }
 452         */
 453         Lock_gauge.sx = sx - Lock_gauge_half_w[gr_screen.res];
 454         Lock_gauge.sy = sy - Lock_gauge_half_h[gr_screen.res];
 455         if(Player_ai->current_target_is_locked){
 456                 Lock_gauge.time_elapsed = 0.0f;
 457                 hud_anim_render(&Lock_gauge, 0.0f, 1);
 458         } else {
 459                 hud_anim_render(&Lock_gauge, frametime, 1);
 460         }
 461 }
 462
 463 // Reset data used for player lock indicator
 464 void hud_lock_reset(float lock_time_scale)
 465 {
 466         weapon_info     *wip;
 467         ship_weapon     *swp;
 468
 469         swp = &Player_ship->weapons;
 470         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 471
 472         Player_ai->current_target_is_locked = 0;
 473         Players[Player_num].lock_indicator_visible = 0;
 474         Player->target_in_lock_cone = 0;
 475         Player->lock_time_to_target = i2fl(wip->min_lock_time*lock_time_scale);
 476         Player->current_target_sx = -1;
 477         Player->current_target_sy = -1;
 478         Player->locking_subsys=NULL;
 479         Player->locking_on_center=0;
 480         Player->locking_subsys_parent=-1;
 481         hud_stop_looped_locking_sounds();
 482
 483         Lock_gauge_draw_stamp = -1;
 484         Lock_gauge_draw = 0;
 485
 486         // reset the lock anim time elapsed
 487         Lock_anim.time_elapsed = 0.0f;
 488 }
 489
 490 // Determine if the locking code has a point to track
 491 int hud_lock_has_homing_point()
 492 {
 493         if ( Player_ai->targeted_subsys || Player->locking_subsys || Player->locking_on_center ) {
 494                 return 1;
 495         }
 496         return 0;
 497 }
 498
 499 int Nebula_sec_range = 0;
 500 DCF_BOOL(nebula_sec_range, Nebula_sec_range)
 501
 502 int hud_lock_world_pos_in_range(vector *target_world_pos, vector *vec_to_target)
 503 {
 504         float                   dist_to_target, weapon_range;
 505         weapon_info     *wip;
 506         ship_weapon     *swp;
 507
 508         int target_in_range=1;
 509
 510         swp = &Player_ship->weapons;
 511         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 512
 513         vm_vec_sub(vec_to_target, target_world_pos, &Player_obj->pos);
 514         dist_to_target = vm_vec_mag(vec_to_target);
 515
 516         // calculate the range of the weapon, and only display the lead target indicator when
 517         // if the weapon can actually hit the target
 518         weapon_range = wip->max_speed * wip->lifetime;
 519
 520         // reduce firing range in nebula
 521         if ((The_mission.flags & MISSION_FLAG_FULLNEB) && Nebula_sec_range) {
 522                 weapon_range *= 0.8f;
 523         }
 524
 525         if (dist_to_target > weapon_range) {
 526                 target_in_range=0;
 527         }
 528
 529         return target_in_range;
 530 }
 531
 532 // Determine if point to lock on is in range
 533 int hud_lock_target_in_range()
 534 {
 535         vector          target_world_pos, vec_to_target;
 536         object          *targetp;
 537
 538         if ( !hud_lock_has_homing_point() ) {
 539                 return 0;
 540         }
 541
 542         targetp = &Objects[Player_ai->target_objnum];
 543
 544         if ( Player_ai->targeted_subsys != NULL ) {
 545                 vm_vec_unrotate(&target_world_pos, &Player_ai->targeted_subsys->system_info->pnt, &targetp->orient);
 546                 vm_vec_add2(&target_world_pos, &targetp->pos);
 547         } else {
 548                 if ( Player->locking_subsys ) {
 549                         vm_vec_unrotate(&target_world_pos, &Player->locking_subsys->system_info->pnt, &targetp->orient);
 550                         vm_vec_add2(&target_world_pos, &targetp->pos);
 551                 } else {
 552                         Assert(Player->locking_on_center);
 553                         target_world_pos = targetp->pos;
 554                 }
 555         }
 556
 557         return hud_lock_world_pos_in_range(&target_world_pos, &vec_to_target);
 558 }
 559
 560 int hud_abort_lock()
 561 {
 562         int target_team;
 563
 564         target_team = obj_team(&Objects[Player_ai->target_objnum]);
 565
 566         if ( Player_ship->weapons.num_secondary_banks <= 0 ) {
 567                 return 1;
 568         }
 569
 570         if ( Player_ship->weapons.current_secondary_bank < 0 ) {
 571                 return 1;
 572         }
 573
 574         // check to see if there are any missile to fire.. we don't want to show the
 575         // lock indicator if there are no missiles to fire.
 576         if ( !ship_secondary_bank_has_ammo(Player_obj->instance) ) {
 577                 return 1;
 578         }
 579
 580         // if the target is friendly, don't lock!
 581         if ( hud_team_matches_filter(Player_ship->team, target_team)) {
 582                 // if we're in multiplayer dogfight, ignore this
 583                 if(!((Game_mode & GM_MULTIPLAYER) && (Netgame.type_flags & NG_TYPE_DOGFIGHT))){
 584                         return 1;
 585                 }
 586         }
 587
 588         return 0;
 589 }
 590
 591 // determine if the subsystem to lock on to has a direct line of sight
 592 int hud_lock_on_subsys_ok()
 593 {
 594         ship_subsys             *subsys;
 595         vector                  subobj_pos;
 596         object                  *target_objp;
 597         int                             in_sight=0;
 598
 599         Assert(Player_ai->target_objnum >= 0);
 600         target_objp     = &Objects[Player_ai->target_objnum];
 601
 602         subsys = Player_ai->targeted_subsys;
 603         if ( !subsys ) {
 604                 return 0;
 605         }
 606
 607         vm_vec_unrotate(&subobj_pos, &subsys->system_info->pnt, &target_objp->orient);
 608         vm_vec_add2(&subobj_pos, &target_objp->pos);
 609
 610         if ( Player->subsys_in_view < 0 ) {
 611                 in_sight = ship_subsystem_in_sight(target_objp, subsys, &View_position, &subobj_pos);
 612         } else {
 613                 in_sight = Player->subsys_in_view;
 614         }
 615
 616         return in_sight;
 617 }
 618
 619 // Determine if locking point is in the locking cone
 620 void hud_lock_check_if_target_in_lock_cone(vector *lock_world_pos)
 621 {
 622         float           dist, dot;
 623         vector  vec_to_target;
 624
 625         dist = vm_vec_normalized_dir(&vec_to_target, lock_world_pos, &Player_obj->pos);
 626         dot = vm_vec_dot(&Player_obj->orient.fvec, &vec_to_target);
 627
 628         if ( dot > 0.85) {
 629                 Player->target_in_lock_cone = 1;
 630         } else {
 631                 Player->target_in_lock_cone = 0;
 632         }
 633
 634 }
 635
 636 // return 1 if current secondary weapon is different than previous secondary weapon
 637 int hud_lock_secondary_weapon_changed(ship_weapon *swp)
 638 {
 639
 640         if ( swp->current_secondary_bank != Player_ai->last_secondary_index ) {
 641                 return 1;
 642         }
 643
 644         return 0;
 645 /*
 646         int last_wi_index = -1;
 647         int current_wi_index = -1;
 648
 649
 650         // do a quick out if same bank is selected
 651         if ( swp->current_secondary_bank == Player_ai->last_secondary_index ) {
 652                 return 0;
 653         }
 654
 655         // bank has changed, but it still may be the same weapon type
 656         if ( swp->current_secondary_bank >= 0 ) {
 657                 current_wi_index = swp->secondary_bank_weapons[swp->current_secondary_bank];
 658         }
 659
 660         if ( Player_ai->last_secondary_index >= 0 ) {
 661                 last_wi_index = swp->secondary_bank_weapons[Player_ai->last_secondary_index];
 662         }
 663
 664         if ( current_wi_index != last_wi_index ) {
 665                 return 1;
 666         }
 667
 668         return 0;
 669 */
 670
 671 }
 672
 673 // hud_update_lock_indicator() will manage the non-rendering dependant part of
 674 // missle locking
 675 void hud_update_lock_indicator(float frametime)
 676 {
 677         ship_weapon *swp;
 678         weapon_info     *wip;
 679         vector          lock_world_pos;
 680
 681         // if i'm a multiplayer observer, bail here
 682         if((Game_mode & GM_MULTIPLAYER) && ((Net_player->flags & NETINFO_FLAG_OBSERVER) || (Player_obj->type == OBJ_OBSERVER)) ){
 683                 return;
 684         }
 685
 686         Assert(Player_ai->target_objnum != -1);
 687
 688         // be sure to unset this flag, then possibly set later in this function so that
 689         // threat indicators work properly.
 690         Player_ai->ai_flags &= ~AIF_SEEK_LOCK;
 691
 692         if ( hud_abort_lock() ) {
 693                 hud_lock_reset();
 694                 return;
 695         }
 696
 697         // if there is an EMP effect active, never update lock
 698         if(emp_active_local()){
 699                 hud_lock_reset();
 700                 return;
 701         }
 702
 703         swp = &Player_ship->weapons;
 704         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 705
 706         Lock_start_dist = wip->min_lock_time * wip->lock_pixels_per_sec;
 707
 708         // if secondary weapons change, reset the lock
 709         if ( hud_lock_secondary_weapon_changed(swp) ) {
 710                 hud_lock_reset();
 711         }
 712
 713         Player_ai->last_secondary_index = swp->current_secondary_bank;
 714
 715         if ( !(wip->wi_flags & WIF_HOMING_ASPECT) ) {
 716                 hud_lock_reset();
 717                 return;
 718         }
 719
 720         // Allow locking on ships and bombs (only targeted weapon allowed is a bomb, so don't bother checking flags)
 721         if ( (Objects[Player_ai->target_objnum].type != OBJ_SHIP) && (Objects[Player_ai->target_objnum].type != OBJ_WEAPON) ) {
 722                 hud_lock_reset();
 723                 return;
 724         }
 725
 726         hud_lock_determine_lock_point(&lock_world_pos);
 727
 728         if ( !hud_lock_has_homing_point() ) {
 729                 Player->target_in_lock_cone=0;
 730         }
 731
 732         hud_lock_check_if_target_in_lock_cone(&lock_world_pos);
 733
 734         // check if the target is within range of the current secondary weapon.  If it is not,
 735         // a lock will not be detected
 736         if ( !hud_lock_target_in_range() ) {
 737                 Player->target_in_lock_cone = 0;
 738         }
 739
 740         // If locking on a subsystem, and not in sight... can't lock
 741         //      Changed by MK on 4/3/98.  It was confusing me that my hornets would not lock on my target.
 742         //      It will now be confusing that they lock, but don't home on your subsystem, but I think that's preferable.
 743         //      Often you really care about destroying the target, not just the subsystem.
 744         /*if ( Player_ai->targeted_subsys ) {
 745                 if ( !hud_lock_on_subsys_ok() ) {
 746                         Player->target_in_lock_cone=0;
 747                 }
 748         }*/
 749
 750         if ( !Player->target_in_lock_cone ) {
 751                 Player->locking_on_center=0;
 752                 Player->locking_subsys_parent=-1;
 753                 Player->locking_subsys=NULL;
 754         }
 755
 756         hud_calculate_lock_position(frametime);
 757
 758         if (!Players[Player_num].lock_indicator_visible)
 759                 return;
 760
 761         if (Player_ai->current_target_is_locked) {
 762                 if ( Missile_track_loop > -1 )  {
 763                         snd_chg_loop_status(Missile_track_loop, 0);
 764                         Missile_track_loop = -1;
 765                         Missile_lock_loop = snd_play(&Snds[SND_MISSILE_LOCK]);
 766                 }
 767         }
 768         else {
 769                 Player_ai->ai_flags |= AIF_SEEK_LOCK;           // set this flag so multiplayer's properly track lock on other ships
 770                 if ( Missile_lock_loop != -1 && snd_is_playing(Missile_lock_loop) ) {
 771                         snd_stop(Missile_lock_loop);
 772                         Missile_lock_loop = -1;
 773                 }
 774         }
 775 }
 776
 777 // hud_draw_lock_triangles() will draw the 4 rotating triangles around a lock indicator
 778 // (This is done when a lock has been acquired)
 779 #define ROTATE_DELAY 40
 780 void hud_draw_lock_triangles_old(int center_x, int center_y, int radius)
 781 {
 782         static float ang = 0.0f;
 783
 784         float end_ang = ang + 2*PI;
 785         float x3,y3,x4,y4,xpos,ypos;
 786
 787         if ( timestamp_elapsed(Rotate_time_id) ) {
 788                 Rotate_time_id = timestamp(ROTATE_DELAY);
 789                 ang += PI/12;
 790         }
 791
 792         for (; ang <= end_ang; ang += PI/2.0f) {
 793
 794                 // draw the orbiting triangles
 795
 796                 //ang = atan2(target_point.y,target_point.x);
 797                 xpos = center_x + (float)cos(ang)*(radius + Lock_triangle_height[gr_screen.res] + 2);
 798                 ypos = center_y - (float)sin(ang)*(radius + Lock_triangle_height[gr_screen.res] + 2);
 799
 800                 x3 = xpos - Lock_triangle_base[gr_screen.res] * (float)sin(-ang);
 801                 y3 = ypos + Lock_triangle_base[gr_screen.res] * (float)cos(-ang);
 802                 x4 = xpos + Lock_triangle_base[gr_screen.res] * (float)sin(-ang);
 803                 y4 = ypos - Lock_triangle_base[gr_screen.res] * (float)cos(-ang);
 804
 805                 xpos = xpos - Lock_triangle_base[gr_screen.res] * (float)cos(ang);
 806                 ypos = ypos + Lock_triangle_base[gr_screen.res] * (float)sin(ang);
 807
 808                 hud_tri(x3, y3, xpos, ypos, x4, y4);
 809         } // end for
 810 }
 811
 812 // draw a frame of the rotating lock triangles animation
 813 void hud_draw_lock_triangles(int center_x, int center_y, float frametime)
 814 {
 815         if ( Lock_anim.first_frame == -1 ) {
 816                 hud_draw_lock_triangles_old(center_x, center_y, Lock_target_box_width[gr_screen.res]/2);
 817         } else {
 818                 // render the anim
 819                 Lock_anim.sx = center_x - Lockspin_half_w[gr_screen.res];
 820                 Lock_anim.sy = center_y - Lockspin_half_h[gr_screen.res];
 821
 822                 // if its still animating
 823                 if(Lock_anim.time_elapsed < Lock_anim.total_time){
 824                         hud_anim_render(&Lock_anim, frametime, 1, 0, 1);
 825                 } else {
 826                         // if the timestamp is unset or expired
 827                         if((Lock_gauge_draw_stamp < 0) || timestamp_elapsed(Lock_gauge_draw_stamp)){
 828                                 // reset timestamp
 829                                 Lock_gauge_draw_stamp = timestamp(1000 / (2 * LOCK_GAUGE_BLINK_RATE));
 830
 831                                 // switch between draw and dont-draw
 832                                 Lock_gauge_draw = !Lock_gauge_draw;
 833                         }
 834
 835                         // maybe draw the anim
 836                         Lock_gauge.time_elapsed = 0.0f;
 837                         if(Lock_gauge_draw){
 838                                 hud_anim_render(&Lock_anim, frametime, 1, 0, 1);
 839                         }
 840                 }
 841         }
 842 }
 843
 844 // hud_calculate_lock_position()  will determine where on the screen to draw the lock
 845 // indicator, and will determine when a lock has occurred.  If the lock indicator is not
 846 // on the screen yet, hud_calculate_lock_start_pos() is called to pick a starting location
 847 void hud_calculate_lock_position(float frametime)
 848 {
 849         ship_weapon *swp;
 850         weapon_info     *wip;
 851
 852         static float pixels_moved_while_locking;
 853         static float pixels_moved_while_degrading;
 854         static int Need_new_start_pos = 0;
 855
 856         static double accumulated_x_pixels, accumulated_y_pixels;
 857         double int_portion;
 858
 859         static float last_dist_to_target;
 860
 861         static int catching_up;
 862
 863         static int maintain_lock_count = 0;
 864
 865         static float catch_up_distance = 0.0f;
 866
 867         double hypotenuse, delta_x, delta_y;
 868
 869         swp = &Player_ship->weapons;
 870         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 871
 872         if (Player->target_in_lock_cone) {
 873                 if (!Players[Player_num].lock_indicator_visible) {
 874                         hud_calculate_lock_start_pos();
 875                         last_dist_to_target = 0.0f;
 876
 877                         Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
 878                         Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
 879                         Players[Player_num].lock_indicator_visible = 1;
 880
 881                         Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
 882                         catching_up = 0;
 883                 }
 884
 885                 Need_new_start_pos = 1;
 886
 887                 if (Player_ai->current_target_is_locked) {
 888                         Players[Player_num].lock_indicator_x = Player->current_target_sx;
 889                         Players[Player_num].lock_indicator_y = Player->current_target_sy;
 890                         return;
 891                 }
 892
 893                 delta_x = Players[Player_num].lock_indicator_x - Player->current_target_sx;
 894                 delta_y = Players[Player_num].lock_indicator_y - Player->current_target_sy;
 895
 896                 if (!delta_y && !delta_x) {
 897                         hypotenuse = 0.0f;
 898                 }
 899                 else {
 900                         hypotenuse = _hypot(delta_y, delta_x);
 901                 }
 902
 903                 Players[Player_num].lock_dist_to_target = (float)hypotenuse;
 904
 905                 if (last_dist_to_target == 0) {
 906                         last_dist_to_target = Players[Player_num].lock_dist_to_target;
 907                 }
 908
 909                 //nprintf(("Alan","dist to target: %.2f\n",Players[Player_num].lock_dist_to_target));
 910                 //nprintf(("Alan","last to target: %.2f\n\n",last_dist_to_target));
 911
 912                 if (catching_up) {
 913                         //nprintf(("Alan","IN CATCH UP MODE  catch_up_dist is %.2f\n",catch_up_distance));
 914                         if ( Players[Player_num].lock_dist_to_target < catch_up_distance )
 915                                 catching_up = 0;
 916                 }
 917                 else {
 918                         //nprintf(("Alan","IN NORMAL MODE\n"));
 919                         if ( (Players[Player_num].lock_dist_to_target - last_dist_to_target) > 2.0f ) {
 920                                 catching_up = 1;
 921                                 catch_up_distance = last_dist_to_target + wip->catchup_pixel_penalty;
 922                         }
 923                 }
 924
 925                 last_dist_to_target = Players[Player_num].lock_dist_to_target;
 926
 927                 if (!catching_up) {
 928                         Players[Player_num].lock_time_to_target -= frametime;
 929                         if (Players[Player_num].lock_time_to_target < 0.0f)
 930                                 Players[Player_num].lock_time_to_target = 0.0f;
 931                 }
 932
 933                 float lock_pixels_per_sec;
 934                 if (Players[Player_num].lock_time_to_target > 0) {
 935                         lock_pixels_per_sec = Players[Player_num].lock_dist_to_target / Players[Player_num].lock_time_to_target;
 936                 } else {
 937                         lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
 938                 }
 939
 940                 if (lock_pixels_per_sec > wip->lock_pixels_per_sec) {
 941                         lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
 942                 }
 943
 944                 if (catching_up) {
 945                         pixels_moved_while_locking = wip->catchup_pixels_per_sec * frametime;
 946                 } else {
 947                         pixels_moved_while_locking = lock_pixels_per_sec * frametime;
 948                 }
 949
 950                 if (delta_x != 0) {
 951                         accumulated_x_pixels += pixels_moved_while_locking * delta_x/hypotenuse;
 952                 }
 953
 954                 if (delta_y != 0) {
 955                         accumulated_y_pixels += pixels_moved_while_locking * delta_y/hypotenuse;
 956                 }
 957
 958                 if (fl_abs(accumulated_x_pixels) > 1.0f) {
 959                         modf(accumulated_x_pixels, &int_portion);
 960
 961                         Players[Player_num].lock_indicator_x -= (int)int_portion;
 962
 963                         if ( fl_abs(Players[Player_num].lock_indicator_x - Player->current_target_sx) < fl_abs(int_portion) )
 964                                 Players[Player_num].lock_indicator_x = Player->current_target_sx;
 965
 966                         accumulated_x_pixels -= int_portion;
 967                 }
 968
 969                 if (fl_abs(accumulated_y_pixels) > 1.0f) {
 970                         modf(accumulated_y_pixels, &int_portion);
 971
 972                         Players[Player_num].lock_indicator_y -= (int)int_portion;
 973
 974                         if ( fl_abs(Players[Player_num].lock_indicator_y - Player->current_target_sy) < fl_abs(int_portion) )
 975                                 Players[Player_num].lock_indicator_y = Player->current_target_sy;
 976
 977                         accumulated_y_pixels -= int_portion;
 978                 }
 979
 980                 if ( Missile_track_loop == -1 ) {
 981                         Missile_track_loop = snd_play_looping( &Snds[SND_MISSILE_TRACKING], 0.0f , -1, -1);
 982                 }
 983
 984                 if (!Players[Player_num].lock_time_to_target) {
 985                         if ( (Players[Player_num].lock_indicator_x == Player->current_target_sx) && (Players[Player_num].lock_indicator_y == Player->current_target_sy) ) {
 986                                 if (maintain_lock_count++ > 1) {
 987                                         Player_ai->current_target_is_locked = 1;
 988                                 }
 989                         } else {
 990                                 maintain_lock_count = 0;
 991                         }
 992                 }
 993
 994         } else {
 995
 996                 if ( Missile_track_loop > -1 )  {
 997                         snd_chg_loop_status(Missile_track_loop, 0);
 998                         Missile_track_loop = -1;
 999                 }
1000
1001                 Player_ai->current_target_is_locked = 0;
1002
1003                 if (!Players[Player_num].lock_indicator_visible) {
1004                         return;
1005                 }
1006
1007                 catching_up = 0;
1008                 last_dist_to_target = 0.0f;
1009
1010                 if (Need_new_start_pos) {
1011                         hud_calculate_lock_start_pos();
1012                         Need_new_start_pos = 0;
1013                         accumulated_x_pixels = 0.0f;
1014                         accumulated_y_pixels = 0.0f;
1015                 }
1016
1017                 delta_x = Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x;
1018                 delta_y = Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y;
1019
1020                 if (!delta_y && !delta_x) {
1021                         hypotenuse = 0.0f;
1022                 }
1023                 else {
1024                         hypotenuse = _hypot(delta_y, delta_x);
1025                 }
1026
1027                 Players[Player_num].lock_time_to_target += frametime;
1028
1029                 if (Players[Player_num].lock_time_to_target > wip->min_lock_time)
1030                         Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
1031
1032                 pixels_moved_while_degrading = 2.0f * wip->lock_pixels_per_sec * frametime;
1033
1034                 if (delta_x != 0)
1035                         accumulated_x_pixels += pixels_moved_while_degrading * delta_x/hypotenuse;
1036
1037                 if (delta_y != 0)
1038                         accumulated_y_pixels += pixels_moved_while_degrading * delta_y/hypotenuse;
1039
1040                 if (fl_abs(accumulated_x_pixels) > 1.0f) {
1041                         modf(accumulated_x_pixels, &int_portion);
1042
1043                         Players[Player_num].lock_indicator_x -= (int)int_portion;
1044
1045                         if ( fl_abs(Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x) < fl_abs(int_portion) )
1046                                 Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
1047
1048                         accumulated_x_pixels -= int_portion;
1049                 }
1050
1051                 if (fl_abs(accumulated_y_pixels) > 1.0f) {
1052                         modf(accumulated_y_pixels, &int_portion);
1053
1054                         Players[Player_num].lock_indicator_y -= (int)int_portion;
1055
1056                         if ( fl_abs(Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y) < fl_abs(int_portion) )
1057                                 Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
1058
1059                         accumulated_y_pixels -= int_portion;
1060                 }
1061
1062                 if ( (Players[Player_num].lock_indicator_x == Players[Player_num].lock_indicator_start_x) && (Players[Player_num].lock_indicator_y == Players[Player_num].lock_indicator_start_y) ) {
1063                         Players[Player_num].lock_indicator_visible = 0;
1064                 }
1065         }
1066 }
1067
1068 // hud_calculate_lock_start_pos() will determine where to draw the starting location of the lock
1069 // indicator.  It does this by picking a location that is Lock_start_dist pixels away from the current
1070 // target (in 2D).  This is accomplished by finding the endpoint of a line that passes through the
1071 // origin, and connects the target and lock indicator postion (and has a magnitude of Lock_start_dist)
1072 void hud_calculate_lock_start_pos()
1073 {
1074         double hypotenuse;
1075         double delta_y;
1076         double delta_x;
1077         double target_mag, target_x, target_y;
1078
1079         delta_x = Player->current_target_sx - SCREEN_CENTER_X;
1080         delta_y = Player->current_target_sy - SCREEN_CENTER_Y;
1081
1082         if (!delta_x && !delta_y) {
1083                 Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X + Lock_start_dist);
1084                 Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y);
1085                 return;
1086         }
1087
1088         hypotenuse = _hypot(delta_y, delta_x);
1089
1090         if (hypotenuse >= Lock_start_dist) {
1091                 Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X);
1092                 Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y);
1093                 return;
1094         }
1095
1096         target_mag = Lock_start_dist - hypotenuse;
1097         target_x = target_mag * (delta_x / hypotenuse);
1098         target_y = target_mag * (delta_y / hypotenuse);
1099
1100         Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X - target_x);
1101         Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y - target_y);
1102
1103         if (Players[Player_num].lock_indicator_start_x > gr_screen.clip_right)
1104                 Players[Player_num].lock_indicator_start_x = gr_screen.clip_right;
1105
1106         if (Players[Player_num].lock_indicator_start_y > gr_screen.clip_bottom)
1107                 Players[Player_num].lock_indicator_start_y = gr_screen.clip_bottom;
1108
1109         if (Players[Player_num].lock_indicator_start_x < gr_screen.clip_left)
1110                 Players[Player_num].lock_indicator_start_x = gr_screen.clip_left;
1111
1112         if (Players[Player_num].lock_indicator_start_y < gr_screen.clip_top)
1113                 Players[Player_num].lock_indicator_start_y = gr_screen.clip_top;
1114 }
1115
1116 // hud_stop_looped_locking_sounds() will terminate any hud related looping sounds that are playing
1117 void hud_stop_looped_locking_sounds()
1118 {
1119         if ( Missile_track_loop > -1 )  {
1120                 snd_stop(Missile_track_loop);
1121                 Missile_track_loop = -1;
1122         }
1123 }
1124
1125 // Get a new world pos for the locking point
1126 void hud_lock_update_lock_pos(object *target_objp, vector *lock_world_pos)
1127 {
1128         if ( Player_ai->targeted_subsys ) {
1129                 get_subsystem_world_pos(target_objp, Player_ai->targeted_subsys, lock_world_pos);
1130                 return;
1131         }
1132
1133         if ( Player->locking_on_center ) {
1134                 *lock_world_pos = target_objp->pos;
1135         } else {
1136                 Assert(Player->locking_subsys);
1137                 get_subsystem_world_pos(target_objp, Player->locking_subsys, lock_world_pos);
1138         }
1139 }
1140
1141 // Try and find a new locking point
1142 void hud_lock_get_new_lock_pos(object *target_objp, vector *lock_world_pos)
1143 {
1144         ship                    *target_shipp=NULL;
1145         int                     lock_in_range=0;
1146         float                   best_lock_dot=-1.0f, lock_dot=-1.0f;
1147         ship_subsys     *ss;
1148         vector          subsys_world_pos, vec_to_lock;
1149
1150         if ( target_objp->type == OBJ_SHIP ) {
1151                 target_shipp = &Ships[target_objp->instance];
1152         }
1153
1154         // if a large ship, lock to pos closest to center and within range
1155         if ( (target_shipp) && (Ship_info[target_shipp->ship_info_index].flags & (SIF_BIG_SHIP|SIF_HUGE_SHIP)) ) {
1156                 // check all the subsystems and the center of the ship
1157
1158                 // assume best lock pos is the center of the ship
1159                 *lock_world_pos=target_objp->pos;
1160                 Player->locking_on_center=1;
1161                 Player->locking_subsys=NULL;
1162                 Player->locking_subsys_parent=-1;
1163                 lock_in_range = hud_lock_world_pos_in_range(lock_world_pos, &vec_to_lock);
1164                 vm_vec_normalize(&vec_to_lock);
1165                 if ( lock_in_range ) {
1166                         best_lock_dot=vm_vec_dot(&Player_obj->orient.fvec, &vec_to_lock);
1167                 }
1168                 // take center if reasonable dot
1169                 if ( best_lock_dot > 0.95 ) {
1170                         return;
1171                 }
1172
1173                 // iterate through subsystems to see if we can get a better choice
1174                 ss = GET_FIRST(&target_shipp->subsys_list);
1175                 while ( ss != END_OF_LIST( &target_shipp->subsys_list ) ) {
1176
1177                         // get world pos of subsystem
1178                         get_subsystem_world_pos(target_objp, ss, &subsys_world_pos);
1179
1180                         if ( hud_lock_world_pos_in_range(&subsys_world_pos, &vec_to_lock) ) {
1181                                 vm_vec_normalize(&vec_to_lock);
1182                                 lock_dot=vm_vec_dot(&Player_obj->orient.fvec, &vec_to_lock);
1183                                 if ( lock_dot > best_lock_dot ) {
1184                                         best_lock_dot=lock_dot;
1185                                         Player->locking_on_center=0;
1186                                         Player->locking_subsys=ss;
1187                                         Player->locking_subsys_parent=Player_ai->target_objnum;
1188                                         *lock_world_pos=subsys_world_pos;
1189                                 }
1190                         }
1191                         ss = GET_NEXT( ss );
1192                 }
1193         } else {
1194                 // if small ship (or weapon), just go for the center
1195                 *lock_world_pos = target_objp->pos;
1196                 Player->locking_on_center=1;
1197                 Player->locking_subsys=NULL;
1198                 Player->locking_subsys_parent=-1;
1199         }
1200 }
1201
1202 // Decide which point lock should be homing on
1203 void hud_lock_determine_lock_point(vector *lock_world_pos_out)
1204 {
1205         vector  lock_world_pos;
1206         vertex  lock_point;
1207         object  *target_objp;
1208
1209         Assert(Player_ai->target_objnum >= 0);
1210         target_objp = &Objects[Player_ai->target_objnum];
1211
1212         Player->current_target_sx = -1;
1213         Player->current_target_sx = -1;
1214
1215         // If subsystem is targeted, we must try to lock on that
1216         if ( Player_ai->targeted_subsys ) {
1217                 hud_lock_update_lock_pos(target_objp, &lock_world_pos);
1218                 Player->locking_on_center=0;
1219                 Player->locking_subsys=NULL;
1220                 Player->locking_subsys_parent=-1;
1221         } else {
1222                 // See if we already have a successful locked point
1223                 if ( hud_lock_has_homing_point() ) {
1224                         hud_lock_update_lock_pos(target_objp, &lock_world_pos);
1225                 } else {
1226                         hud_lock_get_new_lock_pos(target_objp, &lock_world_pos);
1227                 }
1228         }
1229
1230         *lock_world_pos_out=lock_world_pos;
1231
1232         g3_rotate_vertex(&lock_point,&lock_world_pos);
1233         g3_project_vertex(&lock_point);
1234
1235         if (!(lock_point.flags & PF_OVERFLOW)) {  // make sure point projected
1236                 Player->current_target_sx = (int)lock_point.sx;
1237                 Player->current_target_sy = (int)lock_point.sy;
1238         }
1239 }
1240
1241 void hudlock_page_in()
1242 {
1243         bm_page_in_aabitmap( Lock_gauge.first_frame, Lock_gauge.num_frames );
1244 }