src/hud/hudlock.cpp

   1 /*
   2  * Copyright (C) Volition, Inc. 1999.  All rights reserved.
   3  *
   4  * All source code herein is the property of Volition, Inc. You may not sell
   5  * or otherwise commercially exploit the source or things you created based on
   6  * the source.
   7  */
   8
   9 /*
  10  * $Logfile: /Freespace2/code/Hud/HUDlock.cpp $
  11  * $Revision$
  12  * $Date$
  13  * $Author$
  14  *
  15  * C module that controls missile locking
  16  *
  17  * $Log$
  18  * Revision 1.4  2002/06/09 04:41:21  relnev
  19  * added copyright header
  20  *
  21  * Revision 1.3  2002/05/31 07:24:28  relnev
  22  * warning
  23  *
  24  * Revision 1.2  2002/05/07 03:16:45  theoddone33
  25  * The Great Newline Fix
  26  *
  27  * Revision 1.1.1.1  2002/05/03 03:28:09  root
  28  * Initial import.
  29  *
  30  *
  31  * 19    8/09/99 10:50a Jasenw
  32  *
  33  * 18    7/30/99 5:42p Jasenw
  34  * changed coords to center HUD lock indicator.
  35  *
  36  * 17    7/28/99 2:49p Andsager
  37  * Make hud target speed use vm_vec_mag (not vm_vec_mag_quick)
  38  *
  39  * 16    6/08/99 7:41p Dave
  40  * Animated hud lockup icon a bit differently.
  41  *
  42  * 15    6/08/99 8:35a Jasenw
  43  * new coords for new lock ani
  44  *
  45  * 14    6/07/99 4:20p Andsager
  46  * Add HUD color for tagged object.  Apply to target and radar.
  47  *
  48  * 13    6/07/99 1:42p Jasenw
  49  *
  50  * 12    6/04/99 10:58a Dave
  51  * Updated hud lock gauge.
  52  *
  53  * 11    6/03/99 2:32p Jasenw
  54  * changed coords for new HUD stuff
  55  *
  56  * 10    6/02/99 5:41p Andsager
  57  * Reduce range of secondary weapons not fired from turrets in nebula.
  58  * Reduce range of beams fired from turrrets in nebula
  59  *
  60  * 9     4/23/99 12:01p Johnson
  61  * Added SIF_HUGE_SHIP
  62  *
  63  * 8     2/25/99 4:19p Dave
  64  * Added multiplayer_beta defines. Added cd_check define. Fixed a few
  65  * release build warnings. Added more data to the squad war request and
  66  * response packets.
  67  *
  68  * 7     1/07/99 9:07a Jasen
  69  * HUD coords
  70  *
  71  * 6     12/30/98 7:47a Jasen
  72  * added coordinates for hi res
  73  *
  74  * 5     12/28/98 3:17p Dave
  75  * Support for multiple hud bitmap filenames for hi-res mode.
  76  *
  77  * 4     12/21/98 5:02p Dave
  78  * Modified all hud elements to be multi-resolution friendly.
  79  *
  80  * 3     11/05/98 5:55p Dave
  81  * Big pass at reducing #includes
  82  *
  83  * 2     10/07/98 10:53a Dave
  84  * Initial checkin.
  85  *
  86  * 1     10/07/98 10:49a Dave
  87  *
  88  * 55    8/25/98 1:48p Dave
  89  * First rev of EMP effect. Player side stuff basically done. Next comes
  90  * AI code.
  91  *
  92  * 54    5/11/98 3:48p Lawrance
  93  * Break lock when banks switch
  94  *
  95  * 53    5/10/98 7:05p Dave
  96  * Fix endgame sequencing ESC key. Changed how host options warning popups
  97  * are done. Fixed pause/message scrollback/options screen problems in mp.
  98  * Make sure observer HUD doesn't try to lock weapons.
  99  *
 100  * 52    5/04/98 10:50p Lawrance
 101  * Don't break lock when switching to secondary weapons of the same type
 102  *
 103  * 51    4/20/98 12:36a Mike
 104  * Make team vs. team work when player is hostile.  Several targeting
 105  * problems.
 106  *
 107  * 50    4/15/98 12:55a Lawrance
 108  * Make shockwave damage 1/4 if bomb detonated by another weapon.  Allow
 109  * missiles to lock on bombs.
 110  *
 111  * 49    4/13/98 4:52p Allender
 112  * remove AI_frametime and us flFrametime instead.  Make lock warning work
 113  * in multiplayer for aspect seeking missiles.  Debris fixups
 114  *
 115  * 48    4/08/98 8:33p Lawrance
 116  * Make player re-acquire lock when targeting subsystems on a locked ship.
 117  *
 118  * 47    4/03/98 10:29a Mike
 119  * Make aspect seekers home on a ship even if the targeted subsystem is
 120  * backfacing.  Too confusing.
 121  *
 122  * 46    3/26/98 5:46p Lawrance
 123  * call obj_team() instead of ship_team_from_obj()
 124  *
 125  * 45    3/26/98 5:26p John
 126  * added new paging code. nonfunctional.
 127  *
 128  * 44    3/10/98 4:19p John
 129  * Cleaned up graphics lib.  Took out most unused gr functions.   Made D3D
 130  * & Glide have popups and print screen.  Took out all >8bpp software
 131  * support.  Made Fred zbuffer.  Made zbuffer allocate dynamically to
 132  * support Fred.  Made zbuffering key off of functions rather than one
 133  * global variable.
 134  *
 135  * 43    3/10/98 11:16a Lawrance
 136  * Fix potential bug with missles not locking on a subsystem that appeared
 137  * in view
 138  *
 139  * 42    2/28/98 7:03p Lawrance
 140  * Change player missile locking to use dot product, so we can use it in
 141  * the external views
 142  *
 143  * 41    2/22/98 4:17p John
 144  * More string externalization classification... 190 left to go!
 145  *
 146  * 40    1/25/98 10:31p Lawrance
 147  * Don't draw most hud gauges when viewing from another ship.
 148  *
 149  * 39    1/24/98 4:48p Lawrance
 150  * Add 'locking_subsys_parent', needed to save/restore locking_subsys
 151  * pointer.
 152  *
 153  * 38    1/23/98 6:25p Lawrance
 154  * Change player missile locking to lock on subsystem points automatically
 155  *
 156  * 37    1/21/98 7:20p Lawrance
 157  * Make subsystem locking only work with line-of-sight, cleaned up locking
 158  * code, moved globals to player struct.
 159  *
 160  * 36    1/19/98 10:02p Lawrance
 161  * Fix bug with locking on friendlies
 162  *
 163  * 35    12/30/97 4:28p Lawrance
 164  * remove .ani extensions from filenames
 165  *
 166  * 34    12/10/97 9:57a Lawrance
 167  * allow missile locks on all ships but friendly
 168  *
 169  * 33    11/17/97 6:37p Lawrance
 170  * new gauges: extended target view, new lock triangles, support ship view
 171  *
 172  * 32    11/17/97 5:51p Lawrance
 173  * fix bug that was sometimes causing lock to not occur
 174  *
 175  * 31    11/13/97 10:46p Lawrance
 176  * ensure only attempt lock on HOSTILE
 177  *
 178  * 30    11/11/97 12:59a Lawrance
 179  * fix couple of bugs with lock indicator not going away
 180  *
 181  * 29    11/08/97 11:07p Lawrance
 182  * add in new lock indicator
 183  *
 184  * 28    10/28/97 9:02a Lawrance
 185  * don't loop lock sound, some minor reformatting
 186  *
 187  * 27    10/08/97 5:07p Lawrance
 188  * don't lock on friendly ships
 189  *
 190  * 26    9/07/97 10:02p Lawrance
 191  * don't lock on a ship if player doesn't have any missiles
 192  *
 193  * 25    7/02/97 9:35a Hoffoss
 194  * Changed all references to weapon variables in ships to 'weapons'
 195  * structure variables in ships.
 196  *
 197  * 24    6/05/97 1:07a Lawrance
 198  * changes to support sound interface
 199  *
 200  * 23    5/20/97 2:45p Mike
 201  * Move current_target and a bunch of other stuff out of player struct.
 202  *
 203  * 22    4/24/97 10:55a Lawrance
 204  * added Show_lock_cone to DCF
 205  *
 206  * 21    4/18/97 2:54p Lawrance
 207  * sounds now have a default volume, when playing, pass a scaling factor
 208  * not the actual volume
 209  *
 210  * 20    4/15/97 8:36a Lawrance
 211  * fixed bug where lock indicator was lagging locked target
 212  *
 213  * 19    4/13/97 3:53p Lawrance
 214  * separate out the non-rendering dependant portions of the HUD ( sounds,
 215  * updating lock position, changing targets, etc) and put into
 216  * hud_update_frame()
 217  *
 218  * 18    4/12/97 4:29p Lawrance
 219  * get missle locking and offscreen indicator working properly with
 220  * different sized screens
 221  *
 222  * 17    4/10/97 5:29p Lawrance
 223  * hud rendering split up into hud_render_3d(), hud_render_2d() and
 224  * hud_render_target_model()
 225  *
 226  * 16    4/09/97 4:34p Lawrance
 227  * allow looped sounds to be cut off after they complete the full sample
 228  * duration
 229  *
 230  * 15    3/25/97 8:17p Lawrance
 231  * don't allow ASPECT homing missles to lock on debris
 232  *
 233  * 14    3/19/97 5:53p Lawrance
 234  * integrating new Misc_sounds[] array (replaces old Game_sounds
 235  * structure)
 236  *
 237  * 13    3/10/97 8:53a Lawrance
 238  * using hud_stop_looped_locking_sounds() in place of
 239  * hud_stop_looped_sounds()
 240  *
 241  * 12    3/07/97 4:37p Mike
 242  * Make rockeye missile home.
 243  * Remove UNKNOWN and NEUTRAL teams.
 244  *
 245  * 11    3/04/97 2:27p Lawrance
 246  * check to ensure player ship has missile banks
 247  *
 248  * 10    3/04/97 11:19a Lawrance
 249  * supporting banked weapons
 250  *
 251  * 9     1/23/97 12:00p Lawrance
 252  * made lock sound play at normal volume.
 253  *
 254  * 8     1/20/97 7:58p John
 255  * Fixed some link errors with testcode.
 256  *
 257  * 7     1/13/97 5:36p Lawrance
 258  * integrating new Game_sounds structure for general game sounds
 259  *
 260  * 6     1/06/97 10:43p Lawrance
 261  * Changes to make save/restore functional
 262  *
 263  * 5     1/02/97 7:12p Lawrance
 264  * adding hooks for more sounds
 265  *
 266  * 4     1/02/97 10:32a Lawrance
 267  * fixed some bugs related to stopping looped sounds when targets die and
 268  * going to menus
 269  *
 270  * 3     12/24/96 4:32p Lawrance
 271  * some minor improvements
 272  *
 273  * 2     12/23/96 7:53p Lawrance
 274  * missile locking working in new source files
 275  *
 276  * $NoKeywords: $
 277  */
 278
 279 #include "hud.h"
 280 #include "hudlock.h"
 281 #include "hudtarget.h"
 282 #include "hudreticle.h"
 283 #include "player.h"
 284 #include "ship.h"
 285 #include "weapon.h"
 286 #include "sound.h"
 287 #include "timer.h"
 288 #include "freespace.h"
 289 #include "gamesequence.h"
 290 #include "gamesnd.h"
 291 #include "ai.h"
 292 #include "bmpman.h"
 293 #include "3d.h"
 294 #include "linklist.h"
 295 #include "multi.h"
 296 #include "emp.h"
 297
 298
 299 static float Lock_start_dist;
 300 static int Rotate_time_id = 1;  // timer id for controlling how often to rotate triangles around lock indicator
 301
 302 int Missile_track_loop = -1;
 303 int Missile_lock_loop = -1;
 304
 305 int Lock_target_box_width[GR_NUM_RESOLUTIONS] = {
 306         19,
 307         30
 308 };
 309 int Lock_target_box_height[GR_NUM_RESOLUTIONS] = {
 310         19,
 311         30
 312 };
 313
 314 // the locked triangles (that orbit lock indicator) dimensions
 315 float Lock_triangle_base[GR_NUM_RESOLUTIONS] = {
 316         4.0f,
 317         6.5f
 318 };
 319 float Lock_triangle_height[GR_NUM_RESOLUTIONS] = {
 320         4.0f,
 321         6.5f
 322 };
 323
 324 int Lock_gauge_half_w[GR_NUM_RESOLUTIONS] = {
 325         17,
 326         28
 327 };
 328 int Lock_gauge_half_h[GR_NUM_RESOLUTIONS] = {
 329         15,
 330         25
 331 };
 332
 333 // hud_frames Lock_gauge;
 334 int Lock_gauge_loaded = 0;
 335 hud_anim Lock_gauge;
 336 int Lock_gauge_draw = 0;
 337 int Lock_gauge_draw_stamp = -1;
 338 #define LOCK_GAUGE_BLINK_RATE                   5                       // blinks/sec
 339
 340 int Lockspin_half_w[GR_NUM_RESOLUTIONS] = {
 341         31,
 342         50
 343 };
 344 int Lockspin_half_h[GR_NUM_RESOLUTIONS] = {
 345         32,
 346         52
 347 };
 348 hud_anim        Lock_anim;
 349
 350 char Lock_fname[GR_NUM_RESOLUTIONS][MAX_FILENAME_LEN] = {
 351         "lock1",
 352         "2_lock1"
 353 };
 354
 355 char Lockspin_fname[GR_NUM_RESOLUTIONS][MAX_FILENAME_LEN] = {
 356         "lockspin",
 357         "2_lockspin"
 358 };
 359
 360 void hud_lock_determine_lock_point(vector *lock_world_pos_out);
 361
 362 // hud_init_missile_lock() is called at the beginning of a mission
 363 //
 364 void hud_init_missile_lock()
 365 {
 366         Players[Player_num].lock_indicator_start_x = -1;
 367         Players[Player_num].lock_indicator_start_y = -1;
 368         Players[Player_num].lock_indicator_visible = 0;
 369         Player_ai->current_target_is_locked = 0;
 370
 371         Player_ai->last_secondary_index = -1;
 372
 373         Rotate_time_id = 1;
 374
 375         // Load in the frames need for the lead indicator
 376         if (!Lock_gauge_loaded) {
 377                 /*
 378                 Lock_gauge.first_frame = bm_load_animation(Lock_fname[gr_screen.res], &Lock_gauge.num_frames);
 379                 if ( Lock_gauge.first_frame < 0 ) {
 380                         Warning(LOCATION,"Cannot load hud ani: Lock_fname[gr_screen.res]\n");
 381                 }
 382                 */
 383                 hud_anim_init(&Lock_gauge, 0, 0, Lock_fname[gr_screen.res]);
 384                 hud_anim_load(&Lock_gauge);
 385
 386                 hud_anim_init(&Lock_anim, 0, 0, Lockspin_fname[gr_screen.res]);
 387                 hud_anim_load(&Lock_anim);
 388
 389                 Lock_gauge_loaded = 1;
 390
 391                 Lock_gauge_draw_stamp = -1;
 392                 Lock_gauge_draw = 0;
 393         }
 394 }
 395
 396 void hud_draw_diamond(int x, int y, int width, int height)
 397 {
 398         Assert(height>0);
 399         Assert(width>0);
 400
 401         int x1,x2,x3,x4,y1,y2,y3,y4;
 402
 403         x1=x;
 404         y1=y-height/2;
 405
 406         x2=x+width/2;
 407         y2=y;
 408
 409         x3=x;
 410         y3=y+height/2;
 411
 412         x4=x-width/2;
 413         y4=y;
 414
 415         gr_line(x1,y1,x2,y2);
 416         gr_line(x2,y2,x3,y3);
 417         gr_line(x3,y3,x4,y4);
 418         gr_line(x4,y4,x1,y1);
 419 }
 420
 421
 422 // hud_show_lock_indicator() will display the lock indicator for homing missiles
 423 void hud_show_lock_indicator(float frametime)
 424 {
 425         int                     target_objnum, sx, sy;
 426         object          *targetp;
 427
 428         if (!Players[Player_num].lock_indicator_visible){
 429                 return;
 430         }
 431
 432         target_objnum = Player_ai->target_objnum;
 433         Assert(target_objnum != -1);
 434         targetp = &Objects[target_objnum];
 435
 436         // check to see if there are any missile to fire.. we don't want to show the
 437         // lock indicator if there are missiles to fire.
 438         if ( !ship_secondary_bank_has_ammo(Player_obj->instance) ) {
 439                 return;
 440         }
 441
 442         hud_set_iff_color(targetp);
 443 //      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));
 444
 445         if (Player_ai->current_target_is_locked) {
 446                 sx = Player->current_target_sx;
 447                 sy = Player->current_target_sy;
 448                 // show the rotating triangles if target is locked
 449                 hud_draw_lock_triangles(sx, sy, frametime);
 450         } else {
 451                 sx = Players[Player_num].lock_indicator_x;
 452                 sy = Players[Player_num].lock_indicator_y;
 453         }
 454
 455         // show locked indicator
 456         /*
 457         if ( Lock_gauge.first_frame >= 0 ) {
 458                 gr_set_bitmap(Lock_gauge.first_frame);
 459                 gr_aabitmap(sx - Lock_gauge_half_w[gr_screen.res], sy - Lock_gauge_half_h[gr_screen.res]);
 460         } else {
 461                 hud_draw_diamond(sx, sy, Lock_target_box_width[gr_screen.res], Lock_target_box_height[gr_screen.res]);
 462         }
 463         */
 464         Lock_gauge.sx = sx - Lock_gauge_half_w[gr_screen.res];
 465         Lock_gauge.sy = sy - Lock_gauge_half_h[gr_screen.res];
 466         if(Player_ai->current_target_is_locked){
 467                 Lock_gauge.time_elapsed = 0.0f;
 468                 hud_anim_render(&Lock_gauge, 0.0f, 1);
 469         } else {
 470                 hud_anim_render(&Lock_gauge, frametime, 1);
 471         }
 472 }
 473
 474 // Reset data used for player lock indicator
 475 void hud_lock_reset(float lock_time_scale)
 476 {
 477         weapon_info     *wip;
 478         ship_weapon     *swp;
 479
 480         swp = &Player_ship->weapons;
 481         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 482
 483         Player_ai->current_target_is_locked = 0;
 484         Players[Player_num].lock_indicator_visible = 0;
 485         Player->target_in_lock_cone = 0;
 486         Player->lock_time_to_target = i2fl(wip->min_lock_time*lock_time_scale);
 487         Player->current_target_sx = -1;
 488         Player->current_target_sy = -1;
 489         Player->locking_subsys=NULL;
 490         Player->locking_on_center=0;
 491         Player->locking_subsys_parent=-1;
 492         hud_stop_looped_locking_sounds();
 493
 494         Lock_gauge_draw_stamp = -1;
 495         Lock_gauge_draw = 0;
 496
 497         // reset the lock anim time elapsed
 498         Lock_anim.time_elapsed = 0.0f;
 499 }
 500
 501 // Determine if the locking code has a point to track
 502 int hud_lock_has_homing_point()
 503 {
 504         if ( Player_ai->targeted_subsys || Player->locking_subsys || Player->locking_on_center ) {
 505                 return 1;
 506         }
 507         return 0;
 508 }
 509
 510 int Nebula_sec_range = 0;
 511 DCF_BOOL(nebula_sec_range, Nebula_sec_range)
 512
 513 int hud_lock_world_pos_in_range(vector *target_world_pos, vector *vec_to_target)
 514 {
 515         float                   dist_to_target, weapon_range;
 516         weapon_info     *wip;
 517         ship_weapon     *swp;
 518
 519         int target_in_range=1;
 520
 521         swp = &Player_ship->weapons;
 522         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 523
 524         vm_vec_sub(vec_to_target, target_world_pos, &Player_obj->pos);
 525         dist_to_target = vm_vec_mag(vec_to_target);
 526
 527         // calculate the range of the weapon, and only display the lead target indicator when
 528         // if the weapon can actually hit the target
 529         weapon_range = wip->max_speed * wip->lifetime;
 530
 531         // reduce firing range in nebula
 532         if ((The_mission.flags & MISSION_FLAG_FULLNEB) && Nebula_sec_range) {
 533                 weapon_range *= 0.8f;
 534         }
 535
 536         if (dist_to_target > weapon_range) {
 537                 target_in_range=0;
 538         }
 539
 540         return target_in_range;
 541 }
 542
 543 // Determine if point to lock on is in range
 544 int hud_lock_target_in_range()
 545 {
 546         vector          target_world_pos, vec_to_target;
 547         object          *targetp;
 548
 549         if ( !hud_lock_has_homing_point() ) {
 550                 return 0;
 551         }
 552
 553         targetp = &Objects[Player_ai->target_objnum];
 554
 555         if ( Player_ai->targeted_subsys != NULL ) {
 556                 vm_vec_unrotate(&target_world_pos, &Player_ai->targeted_subsys->system_info->pnt, &targetp->orient);
 557                 vm_vec_add2(&target_world_pos, &targetp->pos);
 558         } else {
 559                 if ( Player->locking_subsys ) {
 560                         vm_vec_unrotate(&target_world_pos, &Player->locking_subsys->system_info->pnt, &targetp->orient);
 561                         vm_vec_add2(&target_world_pos, &targetp->pos);
 562                 } else {
 563                         Assert(Player->locking_on_center);
 564                         target_world_pos = targetp->pos;
 565                 }
 566         }
 567
 568         return hud_lock_world_pos_in_range(&target_world_pos, &vec_to_target);
 569 }
 570
 571 int hud_abort_lock()
 572 {
 573         int target_team;
 574
 575         target_team = obj_team(&Objects[Player_ai->target_objnum]);
 576
 577         if ( Player_ship->weapons.num_secondary_banks <= 0 ) {
 578                 return 1;
 579         }
 580
 581         if ( Player_ship->weapons.current_secondary_bank < 0 ) {
 582                 return 1;
 583         }
 584
 585         // check to see if there are any missile to fire.. we don't want to show the
 586         // lock indicator if there are no missiles to fire.
 587         if ( !ship_secondary_bank_has_ammo(Player_obj->instance) ) {
 588                 return 1;
 589         }
 590
 591         // if the target is friendly, don't lock!
 592         if ( hud_team_matches_filter(Player_ship->team, target_team)) {
 593                 // if we're in multiplayer dogfight, ignore this
 594                 if(!((Game_mode & GM_MULTIPLAYER) && (Netgame.type_flags & NG_TYPE_DOGFIGHT))){
 595                         return 1;
 596                 }
 597         }
 598
 599         return 0;
 600 }
 601
 602 // determine if the subsystem to lock on to has a direct line of sight
 603 int hud_lock_on_subsys_ok()
 604 {
 605         ship_subsys             *subsys;
 606         vector                  subobj_pos;
 607         object                  *target_objp;
 608         int                             in_sight=0;
 609
 610         Assert(Player_ai->target_objnum >= 0);
 611         target_objp     = &Objects[Player_ai->target_objnum];
 612
 613         subsys = Player_ai->targeted_subsys;
 614         if ( !subsys ) {
 615                 return 0;
 616         }
 617
 618         vm_vec_unrotate(&subobj_pos, &subsys->system_info->pnt, &target_objp->orient);
 619         vm_vec_add2(&subobj_pos, &target_objp->pos);
 620
 621         if ( Player->subsys_in_view < 0 ) {
 622                 in_sight = ship_subsystem_in_sight(target_objp, subsys, &View_position, &subobj_pos);
 623         } else {
 624                 in_sight = Player->subsys_in_view;
 625         }
 626
 627         return in_sight;
 628 }
 629
 630 // Determine if locking point is in the locking cone
 631 void hud_lock_check_if_target_in_lock_cone(vector *lock_world_pos)
 632 {
 633         float           dist, dot;
 634         vector  vec_to_target;
 635
 636         dist = vm_vec_normalized_dir(&vec_to_target, lock_world_pos, &Player_obj->pos);
 637         dot = vm_vec_dot(&Player_obj->orient.fvec, &vec_to_target);
 638
 639         if ( dot > 0.85) {
 640                 Player->target_in_lock_cone = 1;
 641         } else {
 642                 Player->target_in_lock_cone = 0;
 643         }
 644
 645 }
 646
 647 // return 1 if current secondary weapon is different than previous secondary weapon
 648 int hud_lock_secondary_weapon_changed(ship_weapon *swp)
 649 {
 650
 651         if ( swp->current_secondary_bank != Player_ai->last_secondary_index ) {
 652                 return 1;
 653         }
 654
 655         return 0;
 656 /*
 657         int last_wi_index = -1;
 658         int current_wi_index = -1;
 659
 660
 661         // do a quick out if same bank is selected
 662         if ( swp->current_secondary_bank == Player_ai->last_secondary_index ) {
 663                 return 0;
 664         }
 665
 666         // bank has changed, but it still may be the same weapon type
 667         if ( swp->current_secondary_bank >= 0 ) {
 668                 current_wi_index = swp->secondary_bank_weapons[swp->current_secondary_bank];
 669         }
 670
 671         if ( Player_ai->last_secondary_index >= 0 ) {
 672                 last_wi_index = swp->secondary_bank_weapons[Player_ai->last_secondary_index];
 673         }
 674
 675         if ( current_wi_index != last_wi_index ) {
 676                 return 1;
 677         }
 678
 679         return 0;
 680 */
 681
 682 }
 683
 684 // hud_update_lock_indicator() will manage the non-rendering dependant part of
 685 // missle locking
 686 void hud_update_lock_indicator(float frametime)
 687 {
 688         ship_weapon *swp;
 689         weapon_info     *wip;
 690         vector          lock_world_pos;
 691
 692         // if i'm a multiplayer observer, bail here
 693         if((Game_mode & GM_MULTIPLAYER) && ((Net_player->flags & NETINFO_FLAG_OBSERVER) || (Player_obj->type == OBJ_OBSERVER)) ){
 694                 return;
 695         }
 696
 697         Assert(Player_ai->target_objnum != -1);
 698
 699         // be sure to unset this flag, then possibly set later in this function so that
 700         // threat indicators work properly.
 701         Player_ai->ai_flags &= ~AIF_SEEK_LOCK;
 702
 703         if ( hud_abort_lock() ) {
 704                 hud_lock_reset();
 705                 return;
 706         }
 707
 708         // if there is an EMP effect active, never update lock
 709         if(emp_active_local()){
 710                 hud_lock_reset();
 711                 return;
 712         }
 713
 714         swp = &Player_ship->weapons;
 715         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 716
 717         Lock_start_dist = wip->min_lock_time * wip->lock_pixels_per_sec;
 718
 719         // if secondary weapons change, reset the lock
 720         if ( hud_lock_secondary_weapon_changed(swp) ) {
 721                 hud_lock_reset();
 722         }
 723
 724         Player_ai->last_secondary_index = swp->current_secondary_bank;
 725
 726         if ( !(wip->wi_flags & WIF_HOMING_ASPECT) ) {
 727                 hud_lock_reset();
 728                 return;
 729         }
 730
 731         // Allow locking on ships and bombs (only targeted weapon allowed is a bomb, so don't bother checking flags)
 732         if ( (Objects[Player_ai->target_objnum].type != OBJ_SHIP) && (Objects[Player_ai->target_objnum].type != OBJ_WEAPON) ) {
 733                 hud_lock_reset();
 734                 return;
 735         }
 736
 737         hud_lock_determine_lock_point(&lock_world_pos);
 738
 739         if ( !hud_lock_has_homing_point() ) {
 740                 Player->target_in_lock_cone=0;
 741         }
 742
 743         hud_lock_check_if_target_in_lock_cone(&lock_world_pos);
 744
 745         // check if the target is within range of the current secondary weapon.  If it is not,
 746         // a lock will not be detected
 747         if ( !hud_lock_target_in_range() ) {
 748                 Player->target_in_lock_cone = 0;
 749         }
 750
 751         // If locking on a subsystem, and not in sight... can't lock
 752         //      Changed by MK on 4/3/98.  It was confusing me that my hornets would not lock on my target.
 753         //      It will now be confusing that they lock, but don't home on your subsystem, but I think that's preferable.
 754         //      Often you really care about destroying the target, not just the subsystem.
 755         /*if ( Player_ai->targeted_subsys ) {
 756                 if ( !hud_lock_on_subsys_ok() ) {
 757                         Player->target_in_lock_cone=0;
 758                 }
 759         }*/
 760
 761         if ( !Player->target_in_lock_cone ) {
 762                 Player->locking_on_center=0;
 763                 Player->locking_subsys_parent=-1;
 764                 Player->locking_subsys=NULL;
 765         }
 766
 767         hud_calculate_lock_position(frametime);
 768
 769         if (!Players[Player_num].lock_indicator_visible)
 770                 return;
 771
 772         if (Player_ai->current_target_is_locked) {
 773                 if ( Missile_track_loop > -1 )  {
 774                         snd_chg_loop_status(Missile_track_loop, 0);
 775                         Missile_track_loop = -1;
 776                         Missile_lock_loop = snd_play(&Snds[SND_MISSILE_LOCK]);
 777                 }
 778         }
 779         else {
 780                 Player_ai->ai_flags |= AIF_SEEK_LOCK;           // set this flag so multiplayer's properly track lock on other ships
 781                 if ( Missile_lock_loop != -1 && snd_is_playing(Missile_lock_loop) ) {
 782                         snd_stop(Missile_lock_loop);
 783                         Missile_lock_loop = -1;
 784                 }
 785         }
 786 }
 787
 788 // hud_draw_lock_triangles() will draw the 4 rotating triangles around a lock indicator
 789 // (This is done when a lock has been acquired)
 790 #define ROTATE_DELAY 40
 791 void hud_draw_lock_triangles_old(int center_x, int center_y, int radius)
 792 {
 793         static float ang = 0.0f;
 794
 795         float end_ang = ang + 2*PI;
 796         float x3,y3,x4,y4,xpos,ypos;
 797
 798         if ( timestamp_elapsed(Rotate_time_id) ) {
 799                 Rotate_time_id = timestamp(ROTATE_DELAY);
 800                 ang += PI/12;
 801         }
 802
 803         for (; ang <= end_ang; ang += PI/2.0f) {
 804
 805                 // draw the orbiting triangles
 806
 807                 //ang = atan2(target_point.y,target_point.x);
 808                 xpos = center_x + (float)cos(ang)*(radius + Lock_triangle_height[gr_screen.res] + 2);
 809                 ypos = center_y - (float)sin(ang)*(radius + Lock_triangle_height[gr_screen.res] + 2);
 810
 811                 x3 = xpos - Lock_triangle_base[gr_screen.res] * (float)sin(-ang);
 812                 y3 = ypos + Lock_triangle_base[gr_screen.res] * (float)cos(-ang);
 813                 x4 = xpos + Lock_triangle_base[gr_screen.res] * (float)sin(-ang);
 814                 y4 = ypos - Lock_triangle_base[gr_screen.res] * (float)cos(-ang);
 815
 816                 xpos = xpos - Lock_triangle_base[gr_screen.res] * (float)cos(ang);
 817                 ypos = ypos + Lock_triangle_base[gr_screen.res] * (float)sin(ang);
 818
 819                 hud_tri(x3, y3, xpos, ypos, x4, y4);
 820         } // end for
 821 }
 822
 823 // draw a frame of the rotating lock triangles animation
 824 void hud_draw_lock_triangles(int center_x, int center_y, float frametime)
 825 {
 826         if ( Lock_anim.first_frame == -1 ) {
 827                 hud_draw_lock_triangles_old(center_x, center_y, Lock_target_box_width[gr_screen.res]/2);
 828         } else {
 829                 // render the anim
 830                 Lock_anim.sx = center_x - Lockspin_half_w[gr_screen.res];
 831                 Lock_anim.sy = center_y - Lockspin_half_h[gr_screen.res];
 832
 833                 // if its still animating
 834                 if(Lock_anim.time_elapsed < Lock_anim.total_time){
 835                         hud_anim_render(&Lock_anim, frametime, 1, 0, 1);
 836                 } else {
 837                         // if the timestamp is unset or expired
 838                         if((Lock_gauge_draw_stamp < 0) || timestamp_elapsed(Lock_gauge_draw_stamp)){
 839                                 // reset timestamp
 840                                 Lock_gauge_draw_stamp = timestamp(1000 / (2 * LOCK_GAUGE_BLINK_RATE));
 841
 842                                 // switch between draw and dont-draw
 843                                 Lock_gauge_draw = !Lock_gauge_draw;
 844                         }
 845
 846                         // maybe draw the anim
 847                         Lock_gauge.time_elapsed = 0.0f;
 848                         if(Lock_gauge_draw){
 849                                 hud_anim_render(&Lock_anim, frametime, 1, 0, 1);
 850                         }
 851                 }
 852         }
 853 }
 854
 855 // hud_calculate_lock_position()  will determine where on the screen to draw the lock
 856 // indicator, and will determine when a lock has occurred.  If the lock indicator is not
 857 // on the screen yet, hud_calculate_lock_start_pos() is called to pick a starting location
 858 void hud_calculate_lock_position(float frametime)
 859 {
 860         ship_weapon *swp;
 861         weapon_info     *wip;
 862
 863         static float pixels_moved_while_locking;
 864         static float pixels_moved_while_degrading;
 865         static int Need_new_start_pos = 0;
 866
 867         static double accumulated_x_pixels, accumulated_y_pixels;
 868         double int_portion;
 869
 870         static float last_dist_to_target;
 871
 872         static int catching_up;
 873
 874         static int maintain_lock_count = 0;
 875
 876         static float catch_up_distance = 0.0f;
 877
 878         double hypotenuse, delta_x, delta_y;
 879
 880         swp = &Player_ship->weapons;
 881         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 882
 883         if (Player->target_in_lock_cone) {
 884                 if (!Players[Player_num].lock_indicator_visible) {
 885                         hud_calculate_lock_start_pos();
 886                         last_dist_to_target = 0.0f;
 887
 888                         Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
 889                         Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
 890                         Players[Player_num].lock_indicator_visible = 1;
 891
 892                         Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
 893                         catching_up = 0;
 894                 }
 895
 896                 Need_new_start_pos = 1;
 897
 898                 if (Player_ai->current_target_is_locked) {
 899                         Players[Player_num].lock_indicator_x = Player->current_target_sx;
 900                         Players[Player_num].lock_indicator_y = Player->current_target_sy;
 901                         return;
 902                 }
 903
 904                 delta_x = Players[Player_num].lock_indicator_x - Player->current_target_sx;
 905                 delta_y = Players[Player_num].lock_indicator_y - Player->current_target_sy;
 906
 907                 if (!delta_y && !delta_x) {
 908                         hypotenuse = 0.0f;
 909                 }
 910                 else {
 911                         hypotenuse = _hypot(delta_y, delta_x);
 912                 }
 913
 914                 Players[Player_num].lock_dist_to_target = (float)hypotenuse;
 915
 916                 if (last_dist_to_target == 0) {
 917                         last_dist_to_target = Players[Player_num].lock_dist_to_target;
 918                 }
 919
 920                 //nprintf(("Alan","dist to target: %.2f\n",Players[Player_num].lock_dist_to_target));
 921                 //nprintf(("Alan","last to target: %.2f\n\n",last_dist_to_target));
 922
 923                 if (catching_up) {
 924                         //nprintf(("Alan","IN CATCH UP MODE  catch_up_dist is %.2f\n",catch_up_distance));
 925                         if ( Players[Player_num].lock_dist_to_target < catch_up_distance )
 926                                 catching_up = 0;
 927                 }
 928                 else {
 929                         //nprintf(("Alan","IN NORMAL MODE\n"));
 930                         if ( (Players[Player_num].lock_dist_to_target - last_dist_to_target) > 2.0f ) {
 931                                 catching_up = 1;
 932                                 catch_up_distance = last_dist_to_target + wip->catchup_pixel_penalty;
 933                         }
 934                 }
 935
 936                 last_dist_to_target = Players[Player_num].lock_dist_to_target;
 937
 938                 if (!catching_up) {
 939                         Players[Player_num].lock_time_to_target -= frametime;
 940                         if (Players[Player_num].lock_time_to_target < 0.0f)
 941                                 Players[Player_num].lock_time_to_target = 0.0f;
 942                 }
 943
 944                 float lock_pixels_per_sec;
 945                 if (Players[Player_num].lock_time_to_target > 0) {
 946                         lock_pixels_per_sec = Players[Player_num].lock_dist_to_target / Players[Player_num].lock_time_to_target;
 947                 } else {
 948                         lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
 949                 }
 950
 951                 if (lock_pixels_per_sec > wip->lock_pixels_per_sec) {
 952                         lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
 953                 }
 954
 955                 if (catching_up) {
 956                         pixels_moved_while_locking = wip->catchup_pixels_per_sec * frametime;
 957                 } else {
 958                         pixels_moved_while_locking = lock_pixels_per_sec * frametime;
 959                 }
 960
 961                 if (delta_x != 0) {
 962                         accumulated_x_pixels += pixels_moved_while_locking * delta_x/hypotenuse;
 963                 }
 964
 965                 if (delta_y != 0) {
 966                         accumulated_y_pixels += pixels_moved_while_locking * delta_y/hypotenuse;
 967                 }
 968
 969                 if (fl_abs(accumulated_x_pixels) > 1.0f) {
 970                         modf(accumulated_x_pixels, &int_portion);
 971
 972                         Players[Player_num].lock_indicator_x -= (int)int_portion;
 973
 974                         if ( fl_abs(Players[Player_num].lock_indicator_x - Player->current_target_sx) < fl_abs(int_portion) )
 975                                 Players[Player_num].lock_indicator_x = Player->current_target_sx;
 976
 977                         accumulated_x_pixels -= int_portion;
 978                 }
 979
 980                 if (fl_abs(accumulated_y_pixels) > 1.0f) {
 981                         modf(accumulated_y_pixels, &int_portion);
 982
 983                         Players[Player_num].lock_indicator_y -= (int)int_portion;
 984
 985                         if ( fl_abs(Players[Player_num].lock_indicator_y - Player->current_target_sy) < fl_abs(int_portion) )
 986                                 Players[Player_num].lock_indicator_y = Player->current_target_sy;
 987
 988                         accumulated_y_pixels -= int_portion;
 989                 }
 990
 991                 if ( Missile_track_loop == -1 ) {
 992                         Missile_track_loop = snd_play_looping( &Snds[SND_MISSILE_TRACKING], 0.0f , -1, -1);
 993                 }
 994
 995                 if (!Players[Player_num].lock_time_to_target) {
 996                         if ( (Players[Player_num].lock_indicator_x == Player->current_target_sx) && (Players[Player_num].lock_indicator_y == Player->current_target_sy) ) {
 997                                 if (maintain_lock_count++ > 1) {
 998                                         Player_ai->current_target_is_locked = 1;
 999                                 }
1000                         } else {
1001                                 maintain_lock_count = 0;
1002                         }
1003                 }
1004
1005         } else {
1006
1007                 if ( Missile_track_loop > -1 )  {
1008                         snd_chg_loop_status(Missile_track_loop, 0);
1009                         Missile_track_loop = -1;
1010                 }
1011
1012                 Player_ai->current_target_is_locked = 0;
1013
1014                 if (!Players[Player_num].lock_indicator_visible) {
1015                         return;
1016                 }
1017
1018                 catching_up = 0;
1019                 last_dist_to_target = 0.0f;
1020
1021                 if (Need_new_start_pos) {
1022                         hud_calculate_lock_start_pos();
1023                         Need_new_start_pos = 0;
1024                         accumulated_x_pixels = 0.0f;
1025                         accumulated_y_pixels = 0.0f;
1026                 }
1027
1028                 delta_x = Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x;
1029                 delta_y = Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y;
1030
1031                 if (!delta_y && !delta_x) {
1032                         hypotenuse = 0.0f;
1033                 }
1034                 else {
1035                         hypotenuse = _hypot(delta_y, delta_x);
1036                 }
1037
1038                 Players[Player_num].lock_time_to_target += frametime;
1039
1040                 if (Players[Player_num].lock_time_to_target > wip->min_lock_time)
1041                         Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
1042
1043                 pixels_moved_while_degrading = 2.0f * wip->lock_pixels_per_sec * frametime;
1044
1045                 if (delta_x != 0)
1046                         accumulated_x_pixels += pixels_moved_while_degrading * delta_x/hypotenuse;
1047
1048                 if (delta_y != 0)
1049                         accumulated_y_pixels += pixels_moved_while_degrading * delta_y/hypotenuse;
1050
1051                 if (fl_abs(accumulated_x_pixels) > 1.0f) {
1052                         modf(accumulated_x_pixels, &int_portion);
1053
1054                         Players[Player_num].lock_indicator_x -= (int)int_portion;
1055
1056                         if ( fl_abs(Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x) < fl_abs(int_portion) )
1057                                 Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
1058
1059                         accumulated_x_pixels -= int_portion;
1060                 }
1061
1062                 if (fl_abs(accumulated_y_pixels) > 1.0f) {
1063                         modf(accumulated_y_pixels, &int_portion);
1064
1065                         Players[Player_num].lock_indicator_y -= (int)int_portion;
1066
1067                         if ( fl_abs(Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y) < fl_abs(int_portion) )
1068                                 Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
1069
1070                         accumulated_y_pixels -= int_portion;
1071                 }
1072
1073                 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) ) {
1074                         Players[Player_num].lock_indicator_visible = 0;
1075                 }
1076         }
1077 }
1078
1079 // hud_calculate_lock_start_pos() will determine where to draw the starting location of the lock
1080 // indicator.  It does this by picking a location that is Lock_start_dist pixels away from the current
1081 // target (in 2D).  This is accomplished by finding the endpoint of a line that passes through the
1082 // origin, and connects the target and lock indicator postion (and has a magnitude of Lock_start_dist)
1083 void hud_calculate_lock_start_pos()
1084 {
1085         double hypotenuse;
1086         double delta_y;
1087         double delta_x;
1088         double target_mag, target_x, target_y;
1089
1090         delta_x = Player->current_target_sx - SCREEN_CENTER_X;
1091         delta_y = Player->current_target_sy - SCREEN_CENTER_Y;
1092
1093         if (!delta_x && !delta_y) {
1094                 Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X + Lock_start_dist);
1095                 Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y);
1096                 return;
1097         }
1098
1099         hypotenuse = _hypot(delta_y, delta_x);
1100
1101         if (hypotenuse >= Lock_start_dist) {
1102                 Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X);
1103                 Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y);
1104                 return;
1105         }
1106
1107         target_mag = Lock_start_dist - hypotenuse;
1108         target_x = target_mag * (delta_x / hypotenuse);
1109         target_y = target_mag * (delta_y / hypotenuse);
1110
1111         Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X - target_x);
1112         Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y - target_y);
1113
1114         if (Players[Player_num].lock_indicator_start_x > gr_screen.clip_right)
1115                 Players[Player_num].lock_indicator_start_x = gr_screen.clip_right;
1116
1117         if (Players[Player_num].lock_indicator_start_y > gr_screen.clip_bottom)
1118                 Players[Player_num].lock_indicator_start_y = gr_screen.clip_bottom;
1119
1120         if (Players[Player_num].lock_indicator_start_x < gr_screen.clip_left)
1121                 Players[Player_num].lock_indicator_start_x = gr_screen.clip_left;
1122
1123         if (Players[Player_num].lock_indicator_start_y < gr_screen.clip_top)
1124                 Players[Player_num].lock_indicator_start_y = gr_screen.clip_top;
1125 }
1126
1127 // hud_stop_looped_locking_sounds() will terminate any hud related looping sounds that are playing
1128 void hud_stop_looped_locking_sounds()
1129 {
1130         if ( Missile_track_loop > -1 )  {
1131                 snd_stop(Missile_track_loop);
1132                 Missile_track_loop = -1;
1133         }
1134 }
1135
1136 // Get a new world pos for the locking point
1137 void hud_lock_update_lock_pos(object *target_objp, vector *lock_world_pos)
1138 {
1139         if ( Player_ai->targeted_subsys ) {
1140                 get_subsystem_world_pos(target_objp, Player_ai->targeted_subsys, lock_world_pos);
1141                 return;
1142         }
1143
1144         if ( Player->locking_on_center ) {
1145                 *lock_world_pos = target_objp->pos;
1146         } else {
1147                 Assert(Player->locking_subsys);
1148                 get_subsystem_world_pos(target_objp, Player->locking_subsys, lock_world_pos);
1149         }
1150 }
1151
1152 // Try and find a new locking point
1153 void hud_lock_get_new_lock_pos(object *target_objp, vector *lock_world_pos)
1154 {
1155         ship                    *target_shipp=NULL;
1156         int                     lock_in_range=0;
1157         float                   best_lock_dot=-1.0f, lock_dot=-1.0f;
1158         ship_subsys     *ss;
1159         vector          subsys_world_pos, vec_to_lock;
1160
1161         if ( target_objp->type == OBJ_SHIP ) {
1162                 target_shipp = &Ships[target_objp->instance];
1163         }
1164
1165         // if a large ship, lock to pos closest to center and within range
1166         if ( (target_shipp) && (Ship_info[target_shipp->ship_info_index].flags & (SIF_BIG_SHIP|SIF_HUGE_SHIP)) ) {
1167                 // check all the subsystems and the center of the ship
1168
1169                 // assume best lock pos is the center of the ship
1170                 *lock_world_pos=target_objp->pos;
1171                 Player->locking_on_center=1;
1172                 Player->locking_subsys=NULL;
1173                 Player->locking_subsys_parent=-1;
1174                 lock_in_range = hud_lock_world_pos_in_range(lock_world_pos, &vec_to_lock);
1175                 vm_vec_normalize(&vec_to_lock);
1176                 if ( lock_in_range ) {
1177                         best_lock_dot=vm_vec_dot(&Player_obj->orient.fvec, &vec_to_lock);
1178                 }
1179                 // take center if reasonable dot
1180                 if ( best_lock_dot > 0.95 ) {
1181                         return;
1182                 }
1183
1184                 // iterate through subsystems to see if we can get a better choice
1185                 ss = GET_FIRST(&target_shipp->subsys_list);
1186                 while ( ss != END_OF_LIST( &target_shipp->subsys_list ) ) {
1187
1188                         // get world pos of subsystem
1189                         get_subsystem_world_pos(target_objp, ss, &subsys_world_pos);
1190
1191                         if ( hud_lock_world_pos_in_range(&subsys_world_pos, &vec_to_lock) ) {
1192                                 vm_vec_normalize(&vec_to_lock);
1193                                 lock_dot=vm_vec_dot(&Player_obj->orient.fvec, &vec_to_lock);
1194                                 if ( lock_dot > best_lock_dot ) {
1195                                         best_lock_dot=lock_dot;
1196                                         Player->locking_on_center=0;
1197                                         Player->locking_subsys=ss;
1198                                         Player->locking_subsys_parent=Player_ai->target_objnum;
1199                                         *lock_world_pos=subsys_world_pos;
1200                                 }
1201                         }
1202                         ss = GET_NEXT( ss );
1203                 }
1204         } else {
1205                 // if small ship (or weapon), just go for the center
1206                 *lock_world_pos = target_objp->pos;
1207                 Player->locking_on_center=1;
1208                 Player->locking_subsys=NULL;
1209                 Player->locking_subsys_parent=-1;
1210         }
1211 }
1212
1213 // Decide which point lock should be homing on
1214 void hud_lock_determine_lock_point(vector *lock_world_pos_out)
1215 {
1216         vector  lock_world_pos;
1217         vertex  lock_point;
1218         object  *target_objp;
1219
1220         Assert(Player_ai->target_objnum >= 0);
1221         target_objp = &Objects[Player_ai->target_objnum];
1222
1223         Player->current_target_sx = -1;
1224         Player->current_target_sx = -1;
1225
1226         // If subsystem is targeted, we must try to lock on that
1227         if ( Player_ai->targeted_subsys ) {
1228                 hud_lock_update_lock_pos(target_objp, &lock_world_pos);
1229                 Player->locking_on_center=0;
1230                 Player->locking_subsys=NULL;
1231                 Player->locking_subsys_parent=-1;
1232         } else {
1233                 // See if we already have a successful locked point
1234                 if ( hud_lock_has_homing_point() ) {
1235                         hud_lock_update_lock_pos(target_objp, &lock_world_pos);
1236                 } else {
1237                         hud_lock_get_new_lock_pos(target_objp, &lock_world_pos);
1238                 }
1239         }
1240
1241         *lock_world_pos_out=lock_world_pos;
1242
1243         g3_rotate_vertex(&lock_point,&lock_world_pos);
1244         g3_project_vertex(&lock_point);
1245
1246         if (!(lock_point.flags & PF_OVERFLOW)) {  // make sure point projected
1247                 Player->current_target_sx = (int)lock_point.sx;
1248                 Player->current_target_sy = (int)lock_point.sy;
1249         }
1250 }
1251
1252 void hudlock_page_in()
1253 {
1254         bm_page_in_aabitmap( Lock_gauge.first_frame, Lock_gauge.num_frames );
1255 }