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 1.5  2002/06/17 06:33:09  relnev
  19  * ryan's struct patch for gcc 2.95
  20  *
  21  * Revision 1.4  2002/06/09 04:41:21  relnev
  22  * added copyright header
  23  *
  24  * Revision 1.3  2002/05/31 07:24:28  relnev
  25  * warning
  26  *
  27  * Revision 1.2  2002/05/07 03:16:45  theoddone33
  28  * The Great Newline Fix
  29  *
  30  * Revision 1.1.1.1  2002/05/03 03:28:09  root
  31  * Initial import.
  32  *
  33  *
  34  * 19    8/09/99 10:50a Jasenw
  35  *
  36  * 18    7/30/99 5:42p Jasenw
  37  * changed coords to center HUD lock indicator.
  38  *
  39  * 17    7/28/99 2:49p Andsager
  40  * Make hud target speed use vm_vec_mag (not vm_vec_mag_quick)
  41  *
  42  * 16    6/08/99 7:41p Dave
  43  * Animated hud lockup icon a bit differently.
  44  *
  45  * 15    6/08/99 8:35a Jasenw
  46  * new coords for new lock ani
  47  *
  48  * 14    6/07/99 4:20p Andsager
  49  * Add HUD color for tagged object.  Apply to target and radar.
  50  *
  51  * 13    6/07/99 1:42p Jasenw
  52  *
  53  * 12    6/04/99 10:58a Dave
  54  * Updated hud lock gauge.
  55  *
  56  * 11    6/03/99 2:32p Jasenw
  57  * changed coords for new HUD stuff
  58  *
  59  * 10    6/02/99 5:41p Andsager
  60  * Reduce range of secondary weapons not fired from turrets in nebula.
  61  * Reduce range of beams fired from turrrets in nebula
  62  *
  63  * 9     4/23/99 12:01p Johnson
  64  * Added SIF_HUGE_SHIP
  65  *
  66  * 8     2/25/99 4:19p Dave
  67  * Added multiplayer_beta defines. Added cd_check define. Fixed a few
  68  * release build warnings. Added more data to the squad war request and
  69  * response packets.
  70  *
  71  * 7     1/07/99 9:07a Jasen
  72  * HUD coords
  73  *
  74  * 6     12/30/98 7:47a Jasen
  75  * added coordinates for hi res
  76  *
  77  * 5     12/28/98 3:17p Dave
  78  * Support for multiple hud bitmap filenames for hi-res mode.
  79  *
  80  * 4     12/21/98 5:02p Dave
  81  * Modified all hud elements to be multi-resolution friendly.
  82  *
  83  * 3     11/05/98 5:55p Dave
  84  * Big pass at reducing #includes
  85  *
  86  * 2     10/07/98 10:53a Dave
  87  * Initial checkin.
  88  *
  89  * 1     10/07/98 10:49a Dave
  90  *
  91  * 55    8/25/98 1:48p Dave
  92  * First rev of EMP effect. Player side stuff basically done. Next comes
  93  * AI code.
  94  *
  95  * 54    5/11/98 3:48p Lawrance
  96  * Break lock when banks switch
  97  *
  98  * 53    5/10/98 7:05p Dave
  99  * Fix endgame sequencing ESC key. Changed how host options warning popups
 100  * are done. Fixed pause/message scrollback/options screen problems in mp.
 101  * Make sure observer HUD doesn't try to lock weapons.
 102  *
 103  * 52    5/04/98 10:50p Lawrance
 104  * Don't break lock when switching to secondary weapons of the same type
 105  *
 106  * 51    4/20/98 12:36a Mike
 107  * Make team vs. team work when player is hostile.  Several targeting
 108  * problems.
 109  *
 110  * 50    4/15/98 12:55a Lawrance
 111  * Make shockwave damage 1/4 if bomb detonated by another weapon.  Allow
 112  * missiles to lock on bombs.
 113  *
 114  * 49    4/13/98 4:52p Allender
 115  * remove AI_frametime and us flFrametime instead.  Make lock warning work
 116  * in multiplayer for aspect seeking missiles.  Debris fixups
 117  *
 118  * 48    4/08/98 8:33p Lawrance
 119  * Make player re-acquire lock when targeting subsystems on a locked ship.
 120  *
 121  * 47    4/03/98 10:29a Mike
 122  * Make aspect seekers home on a ship even if the targeted subsystem is
 123  * backfacing.  Too confusing.
 124  *
 125  * 46    3/26/98 5:46p Lawrance
 126  * call obj_team() instead of ship_team_from_obj()
 127  *
 128  * 45    3/26/98 5:26p John
 129  * added new paging code. nonfunctional.
 130  *
 131  * 44    3/10/98 4:19p John
 132  * Cleaned up graphics lib.  Took out most unused gr functions.   Made D3D
 133  * & Glide have popups and print screen.  Took out all >8bpp software
 134  * support.  Made Fred zbuffer.  Made zbuffer allocate dynamically to
 135  * support Fred.  Made zbuffering key off of functions rather than one
 136  * global variable.
 137  *
 138  * 43    3/10/98 11:16a Lawrance
 139  * Fix potential bug with missles not locking on a subsystem that appeared
 140  * in view
 141  *
 142  * 42    2/28/98 7:03p Lawrance
 143  * Change player missile locking to use dot product, so we can use it in
 144  * the external views
 145  *
 146  * 41    2/22/98 4:17p John
 147  * More string externalization classification... 190 left to go!
 148  *
 149  * 40    1/25/98 10:31p Lawrance
 150  * Don't draw most hud gauges when viewing from another ship.
 151  *
 152  * 39    1/24/98 4:48p Lawrance
 153  * Add 'locking_subsys_parent', needed to save/restore locking_subsys
 154  * pointer.
 155  *
 156  * 38    1/23/98 6:25p Lawrance
 157  * Change player missile locking to lock on subsystem points automatically
 158  *
 159  * 37    1/21/98 7:20p Lawrance
 160  * Make subsystem locking only work with line-of-sight, cleaned up locking
 161  * code, moved globals to player struct.
 162  *
 163  * 36    1/19/98 10:02p Lawrance
 164  * Fix bug with locking on friendlies
 165  *
 166  * 35    12/30/97 4:28p Lawrance
 167  * remove .ani extensions from filenames
 168  *
 169  * 34    12/10/97 9:57a Lawrance
 170  * allow missile locks on all ships but friendly
 171  *
 172  * 33    11/17/97 6:37p Lawrance
 173  * new gauges: extended target view, new lock triangles, support ship view
 174  *
 175  * 32    11/17/97 5:51p Lawrance
 176  * fix bug that was sometimes causing lock to not occur
 177  *
 178  * 31    11/13/97 10:46p Lawrance
 179  * ensure only attempt lock on HOSTILE
 180  *
 181  * 30    11/11/97 12:59a Lawrance
 182  * fix couple of bugs with lock indicator not going away
 183  *
 184  * 29    11/08/97 11:07p Lawrance
 185  * add in new lock indicator
 186  *
 187  * 28    10/28/97 9:02a Lawrance
 188  * don't loop lock sound, some minor reformatting
 189  *
 190  * 27    10/08/97 5:07p Lawrance
 191  * don't lock on friendly ships
 192  *
 193  * 26    9/07/97 10:02p Lawrance
 194  * don't lock on a ship if player doesn't have any missiles
 195  *
 196  * 25    7/02/97 9:35a Hoffoss
 197  * Changed all references to weapon variables in ships to 'weapons'
 198  * structure variables in ships.
 199  *
 200  * 24    6/05/97 1:07a Lawrance
 201  * changes to support sound interface
 202  *
 203  * 23    5/20/97 2:45p Mike
 204  * Move current_target and a bunch of other stuff out of player struct.
 205  *
 206  * 22    4/24/97 10:55a Lawrance
 207  * added Show_lock_cone to DCF
 208  *
 209  * 21    4/18/97 2:54p Lawrance
 210  * sounds now have a default volume, when playing, pass a scaling factor
 211  * not the actual volume
 212  *
 213  * 20    4/15/97 8:36a Lawrance
 214  * fixed bug where lock indicator was lagging locked target
 215  *
 216  * 19    4/13/97 3:53p Lawrance
 217  * separate out the non-rendering dependant portions of the HUD ( sounds,
 218  * updating lock position, changing targets, etc) and put into
 219  * hud_update_frame()
 220  *
 221  * 18    4/12/97 4:29p Lawrance
 222  * get missle locking and offscreen indicator working properly with
 223  * different sized screens
 224  *
 225  * 17    4/10/97 5:29p Lawrance
 226  * hud rendering split up into hud_render_3d(), hud_render_2d() and
 227  * hud_render_target_model()
 228  *
 229  * 16    4/09/97 4:34p Lawrance
 230  * allow looped sounds to be cut off after they complete the full sample
 231  * duration
 232  *
 233  * 15    3/25/97 8:17p Lawrance
 234  * don't allow ASPECT homing missles to lock on debris
 235  *
 236  * 14    3/19/97 5:53p Lawrance
 237  * integrating new Misc_sounds[] array (replaces old Game_sounds
 238  * structure)
 239  *
 240  * 13    3/10/97 8:53a Lawrance
 241  * using hud_stop_looped_locking_sounds() in place of
 242  * hud_stop_looped_sounds()
 243  *
 244  * 12    3/07/97 4:37p Mike
 245  * Make rockeye missile home.
 246  * Remove UNKNOWN and NEUTRAL teams.
 247  *
 248  * 11    3/04/97 2:27p Lawrance
 249  * check to ensure player ship has missile banks
 250  *
 251  * 10    3/04/97 11:19a Lawrance
 252  * supporting banked weapons
 253  *
 254  * 9     1/23/97 12:00p Lawrance
 255  * made lock sound play at normal volume.
 256  *
 257  * 8     1/20/97 7:58p John
 258  * Fixed some link errors with testcode.
 259  *
 260  * 7     1/13/97 5:36p Lawrance
 261  * integrating new Game_sounds structure for general game sounds
 262  *
 263  * 6     1/06/97 10:43p Lawrance
 264  * Changes to make save/restore functional
 265  *
 266  * 5     1/02/97 7:12p Lawrance
 267  * adding hooks for more sounds
 268  *
 269  * 4     1/02/97 10:32a Lawrance
 270  * fixed some bugs related to stopping looped sounds when targets die and
 271  * going to menus
 272  *
 273  * 3     12/24/96 4:32p Lawrance
 274  * some minor improvements
 275  *
 276  * 2     12/23/96 7:53p Lawrance
 277  * missile locking working in new source files
 278  *
 279  * $NoKeywords: $
 280  */
 281
 282 #include "hud.h"
 283 #include "hudlock.h"
 284 #include "hudtarget.h"
 285 #include "hudreticle.h"
 286 #include "player.h"
 287 #include "ship.h"
 288 #include "weapon.h"
 289 #include "sound.h"
 290 #include "timer.h"
 291 #include "freespace.h"
 292 #include "gamesequence.h"
 293 #include "gamesnd.h"
 294 #include "ai.h"
 295 #include "bmpman.h"
 296 #include "3d.h"
 297 #include "linklist.h"
 298 #include "multi.h"
 299 #include "emp.h"
 300
 301
 302 static float Lock_start_dist;
 303 static int Rotate_time_id = 1;  // timer id for controlling how often to rotate triangles around lock indicator
 304
 305 int Missile_track_loop = -1;
 306 int Missile_lock_loop = -1;
 307
 308 int Lock_target_box_width[GR_NUM_RESOLUTIONS] = {
 309         19,
 310         30
 311 };
 312 int Lock_target_box_height[GR_NUM_RESOLUTIONS] = {
 313         19,
 314         30
 315 };
 316
 317 // the locked triangles (that orbit lock indicator) dimensions
 318 float Lock_triangle_base[GR_NUM_RESOLUTIONS] = {
 319         4.0f,
 320         6.5f
 321 };
 322 float Lock_triangle_height[GR_NUM_RESOLUTIONS] = {
 323         4.0f,
 324         6.5f
 325 };
 326
 327 int Lock_gauge_half_w[GR_NUM_RESOLUTIONS] = {
 328         17,
 329         28
 330 };
 331 int Lock_gauge_half_h[GR_NUM_RESOLUTIONS] = {
 332         15,
 333         25
 334 };
 335
 336 // hud_frames Lock_gauge;
 337 int Lock_gauge_loaded = 0;
 338 hud_anim Lock_gauge;
 339 int Lock_gauge_draw = 0;
 340 int Lock_gauge_draw_stamp = -1;
 341 #define LOCK_GAUGE_BLINK_RATE                   5                       // blinks/sec
 342
 343 int Lockspin_half_w[GR_NUM_RESOLUTIONS] = {
 344         31,
 345         50
 346 };
 347 int Lockspin_half_h[GR_NUM_RESOLUTIONS] = {
 348         32,
 349         52
 350 };
 351 hud_anim        Lock_anim;
 352
 353 char Lock_fname[GR_NUM_RESOLUTIONS][MAX_FILENAME_LEN] = {
 354         "lock1",
 355         "2_lock1"
 356 };
 357
 358 char Lockspin_fname[GR_NUM_RESOLUTIONS][MAX_FILENAME_LEN] = {
 359         "lockspin",
 360         "2_lockspin"
 361 };
 362
 363 void hud_lock_determine_lock_point(vector *lock_world_pos_out);
 364
 365 // hud_init_missile_lock() is called at the beginning of a mission
 366 //
 367 void hud_init_missile_lock()
 368 {
 369         Players[Player_num].lock_indicator_start_x = -1;
 370         Players[Player_num].lock_indicator_start_y = -1;
 371         Players[Player_num].lock_indicator_visible = 0;
 372         Player_ai->current_target_is_locked = 0;
 373
 374         Player_ai->last_secondary_index = -1;
 375
 376         Rotate_time_id = 1;
 377
 378         // Load in the frames need for the lead indicator
 379         if (!Lock_gauge_loaded) {
 380                 /*
 381                 Lock_gauge.first_frame = bm_load_animation(Lock_fname[gr_screen.res], &Lock_gauge.num_frames);
 382                 if ( Lock_gauge.first_frame < 0 ) {
 383                         Warning(LOCATION,"Cannot load hud ani: Lock_fname[gr_screen.res]\n");
 384                 }
 385                 */
 386                 hud_anim_init(&Lock_gauge, 0, 0, Lock_fname[gr_screen.res]);
 387                 hud_anim_load(&Lock_gauge);
 388
 389                 hud_anim_init(&Lock_anim, 0, 0, Lockspin_fname[gr_screen.res]);
 390                 hud_anim_load(&Lock_anim);
 391
 392                 Lock_gauge_loaded = 1;
 393
 394                 Lock_gauge_draw_stamp = -1;
 395                 Lock_gauge_draw = 0;
 396         }
 397 }
 398
 399 void hud_draw_diamond(int x, int y, int width, int height)
 400 {
 401         Assert(height>0);
 402         Assert(width>0);
 403
 404         int x1,x2,x3,x4,y1,y2,y3,y4;
 405
 406         x1=x;
 407         y1=y-height/2;
 408
 409         x2=x+width/2;
 410         y2=y;
 411
 412         x3=x;
 413         y3=y+height/2;
 414
 415         x4=x-width/2;
 416         y4=y;
 417
 418         gr_line(x1,y1,x2,y2);
 419         gr_line(x2,y2,x3,y3);
 420         gr_line(x3,y3,x4,y4);
 421         gr_line(x4,y4,x1,y1);
 422 }
 423
 424
 425 // hud_show_lock_indicator() will display the lock indicator for homing missiles
 426 void hud_show_lock_indicator(float frametime)
 427 {
 428         int                     target_objnum, sx, sy;
 429         object          *targetp;
 430
 431         if (!Players[Player_num].lock_indicator_visible){
 432                 return;
 433         }
 434
 435         target_objnum = Player_ai->target_objnum;
 436         Assert(target_objnum != -1);
 437         targetp = &Objects[target_objnum];
 438
 439         // check to see if there are any missile to fire.. we don't want to show the
 440         // lock indicator if there are missiles to fire.
 441         if ( !ship_secondary_bank_has_ammo(Player_obj->instance) ) {
 442                 return;
 443         }
 444
 445         hud_set_iff_color(targetp);
 446 //      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));
 447
 448         if (Player_ai->current_target_is_locked) {
 449                 sx = Player->current_target_sx;
 450                 sy = Player->current_target_sy;
 451                 // show the rotating triangles if target is locked
 452                 hud_draw_lock_triangles(sx, sy, frametime);
 453         } else {
 454                 sx = Players[Player_num].lock_indicator_x;
 455                 sy = Players[Player_num].lock_indicator_y;
 456         }
 457
 458         // show locked indicator
 459         /*
 460         if ( Lock_gauge.first_frame >= 0 ) {
 461                 gr_set_bitmap(Lock_gauge.first_frame);
 462                 gr_aabitmap(sx - Lock_gauge_half_w[gr_screen.res], sy - Lock_gauge_half_h[gr_screen.res]);
 463         } else {
 464                 hud_draw_diamond(sx, sy, Lock_target_box_width[gr_screen.res], Lock_target_box_height[gr_screen.res]);
 465         }
 466         */
 467         Lock_gauge.sx = sx - Lock_gauge_half_w[gr_screen.res];
 468         Lock_gauge.sy = sy - Lock_gauge_half_h[gr_screen.res];
 469         if(Player_ai->current_target_is_locked){
 470                 Lock_gauge.time_elapsed = 0.0f;
 471                 hud_anim_render(&Lock_gauge, 0.0f, 1);
 472         } else {
 473                 hud_anim_render(&Lock_gauge, frametime, 1);
 474         }
 475 }
 476
 477 // Reset data used for player lock indicator
 478 void hud_lock_reset(float lock_time_scale)
 479 {
 480         weapon_info     *wip;
 481         ship_weapon     *swp;
 482
 483         swp = &Player_ship->weapons;
 484         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 485
 486         Player_ai->current_target_is_locked = 0;
 487         Players[Player_num].lock_indicator_visible = 0;
 488         Player->target_in_lock_cone = 0;
 489         Player->lock_time_to_target = i2fl(wip->min_lock_time*lock_time_scale);
 490         Player->current_target_sx = -1;
 491         Player->current_target_sy = -1;
 492         Player->locking_subsys=NULL;
 493         Player->locking_on_center=0;
 494         Player->locking_subsys_parent=-1;
 495         hud_stop_looped_locking_sounds();
 496
 497         Lock_gauge_draw_stamp = -1;
 498         Lock_gauge_draw = 0;
 499
 500         // reset the lock anim time elapsed
 501         Lock_anim.time_elapsed = 0.0f;
 502 }
 503
 504 // Determine if the locking code has a point to track
 505 int hud_lock_has_homing_point()
 506 {
 507         if ( Player_ai->targeted_subsys || Player->locking_subsys || Player->locking_on_center ) {
 508                 return 1;
 509         }
 510         return 0;
 511 }
 512
 513 int Nebula_sec_range = 0;
 514 DCF_BOOL(nebula_sec_range, Nebula_sec_range)
 515
 516 int hud_lock_world_pos_in_range(vector *target_world_pos, vector *vec_to_target)
 517 {
 518         float                   dist_to_target, weapon_range;
 519         weapon_info     *wip;
 520         ship_weapon     *swp;
 521
 522         int target_in_range=1;
 523
 524         swp = &Player_ship->weapons;
 525         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 526
 527         vm_vec_sub(vec_to_target, target_world_pos, &Player_obj->pos);
 528         dist_to_target = vm_vec_mag(vec_to_target);
 529
 530         // calculate the range of the weapon, and only display the lead target indicator when
 531         // if the weapon can actually hit the target
 532         weapon_range = wip->max_speed * wip->lifetime;
 533
 534         // reduce firing range in nebula
 535         if ((The_mission.flags & MISSION_FLAG_FULLNEB) && Nebula_sec_range) {
 536                 weapon_range *= 0.8f;
 537         }
 538
 539         if (dist_to_target > weapon_range) {
 540                 target_in_range=0;
 541         }
 542
 543         return target_in_range;
 544 }
 545
 546 // Determine if point to lock on is in range
 547 int hud_lock_target_in_range()
 548 {
 549         vector          target_world_pos, vec_to_target;
 550         object          *targetp;
 551
 552         if ( !hud_lock_has_homing_point() ) {
 553                 return 0;
 554         }
 555
 556         targetp = &Objects[Player_ai->target_objnum];
 557
 558         if ( Player_ai->targeted_subsys != NULL ) {
 559                 vm_vec_unrotate(&target_world_pos, &Player_ai->targeted_subsys->system_info->pnt, &targetp->orient);
 560                 vm_vec_add2(&target_world_pos, &targetp->pos);
 561         } else {
 562                 if ( Player->locking_subsys ) {
 563                         vm_vec_unrotate(&target_world_pos, &Player->locking_subsys->system_info->pnt, &targetp->orient);
 564                         vm_vec_add2(&target_world_pos, &targetp->pos);
 565                 } else {
 566                         Assert(Player->locking_on_center);
 567                         target_world_pos = targetp->pos;
 568                 }
 569         }
 570
 571         return hud_lock_world_pos_in_range(&target_world_pos, &vec_to_target);
 572 }
 573
 574 int hud_abort_lock()
 575 {
 576         int target_team;
 577
 578         target_team = obj_team(&Objects[Player_ai->target_objnum]);
 579
 580         if ( Player_ship->weapons.num_secondary_banks <= 0 ) {
 581                 return 1;
 582         }
 583
 584         if ( Player_ship->weapons.current_secondary_bank < 0 ) {
 585                 return 1;
 586         }
 587
 588         // check to see if there are any missile to fire.. we don't want to show the
 589         // lock indicator if there are no missiles to fire.
 590         if ( !ship_secondary_bank_has_ammo(Player_obj->instance) ) {
 591                 return 1;
 592         }
 593
 594         // if the target is friendly, don't lock!
 595         if ( hud_team_matches_filter(Player_ship->team, target_team)) {
 596                 // if we're in multiplayer dogfight, ignore this
 597                 if(!((Game_mode & GM_MULTIPLAYER) && (Netgame.type_flags & NG_TYPE_DOGFIGHT))){
 598                         return 1;
 599                 }
 600         }
 601
 602         return 0;
 603 }
 604
 605 // determine if the subsystem to lock on to has a direct line of sight
 606 int hud_lock_on_subsys_ok()
 607 {
 608         ship_subsys             *subsys;
 609         vector                  subobj_pos;
 610         object                  *target_objp;
 611         int                             in_sight=0;
 612
 613         Assert(Player_ai->target_objnum >= 0);
 614         target_objp     = &Objects[Player_ai->target_objnum];
 615
 616         subsys = Player_ai->targeted_subsys;
 617         if ( !subsys ) {
 618                 return 0;
 619         }
 620
 621         vm_vec_unrotate(&subobj_pos, &subsys->system_info->pnt, &target_objp->orient);
 622         vm_vec_add2(&subobj_pos, &target_objp->pos);
 623
 624         if ( Player->subsys_in_view < 0 ) {
 625                 in_sight = ship_subsystem_in_sight(target_objp, subsys, &View_position, &subobj_pos);
 626         } else {
 627                 in_sight = Player->subsys_in_view;
 628         }
 629
 630         return in_sight;
 631 }
 632
 633 // Determine if locking point is in the locking cone
 634 void hud_lock_check_if_target_in_lock_cone(vector *lock_world_pos)
 635 {
 636         float           dist, dot;
 637         vector  vec_to_target;
 638
 639         dist = vm_vec_normalized_dir(&vec_to_target, lock_world_pos, &Player_obj->pos);
 640         dot = vm_vec_dot(&Player_obj->orient.v.fvec, &vec_to_target);
 641
 642         if ( dot > 0.85) {
 643                 Player->target_in_lock_cone = 1;
 644         } else {
 645                 Player->target_in_lock_cone = 0;
 646         }
 647
 648 }
 649
 650 // return 1 if current secondary weapon is different than previous secondary weapon
 651 int hud_lock_secondary_weapon_changed(ship_weapon *swp)
 652 {
 653
 654         if ( swp->current_secondary_bank != Player_ai->last_secondary_index ) {
 655                 return 1;
 656         }
 657
 658         return 0;
 659 /*
 660         int last_wi_index = -1;
 661         int current_wi_index = -1;
 662
 663
 664         // do a quick out if same bank is selected
 665         if ( swp->current_secondary_bank == Player_ai->last_secondary_index ) {
 666                 return 0;
 667         }
 668
 669         // bank has changed, but it still may be the same weapon type
 670         if ( swp->current_secondary_bank >= 0 ) {
 671                 current_wi_index = swp->secondary_bank_weapons[swp->current_secondary_bank];
 672         }
 673
 674         if ( Player_ai->last_secondary_index >= 0 ) {
 675                 last_wi_index = swp->secondary_bank_weapons[Player_ai->last_secondary_index];
 676         }
 677
 678         if ( current_wi_index != last_wi_index ) {
 679                 return 1;
 680         }
 681
 682         return 0;
 683 */
 684
 685 }
 686
 687 // hud_update_lock_indicator() will manage the non-rendering dependant part of
 688 // missle locking
 689 void hud_update_lock_indicator(float frametime)
 690 {
 691         ship_weapon *swp;
 692         weapon_info     *wip;
 693         vector          lock_world_pos;
 694
 695         // if i'm a multiplayer observer, bail here
 696         if((Game_mode & GM_MULTIPLAYER) && ((Net_player->flags & NETINFO_FLAG_OBSERVER) || (Player_obj->type == OBJ_OBSERVER)) ){
 697                 return;
 698         }
 699
 700         Assert(Player_ai->target_objnum != -1);
 701
 702         // be sure to unset this flag, then possibly set later in this function so that
 703         // threat indicators work properly.
 704         Player_ai->ai_flags &= ~AIF_SEEK_LOCK;
 705
 706         if ( hud_abort_lock() ) {
 707                 hud_lock_reset();
 708                 return;
 709         }
 710
 711         // if there is an EMP effect active, never update lock
 712         if(emp_active_local()){
 713                 hud_lock_reset();
 714                 return;
 715         }
 716
 717         swp = &Player_ship->weapons;
 718         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 719
 720         Lock_start_dist = wip->min_lock_time * wip->lock_pixels_per_sec;
 721
 722         // if secondary weapons change, reset the lock
 723         if ( hud_lock_secondary_weapon_changed(swp) ) {
 724                 hud_lock_reset();
 725         }
 726
 727         Player_ai->last_secondary_index = swp->current_secondary_bank;
 728
 729         if ( !(wip->wi_flags & WIF_HOMING_ASPECT) ) {
 730                 hud_lock_reset();
 731                 return;
 732         }
 733
 734         // Allow locking on ships and bombs (only targeted weapon allowed is a bomb, so don't bother checking flags)
 735         if ( (Objects[Player_ai->target_objnum].type != OBJ_SHIP) && (Objects[Player_ai->target_objnum].type != OBJ_WEAPON) ) {
 736                 hud_lock_reset();
 737                 return;
 738         }
 739
 740         hud_lock_determine_lock_point(&lock_world_pos);
 741
 742         if ( !hud_lock_has_homing_point() ) {
 743                 Player->target_in_lock_cone=0;
 744         }
 745
 746         hud_lock_check_if_target_in_lock_cone(&lock_world_pos);
 747
 748         // check if the target is within range of the current secondary weapon.  If it is not,
 749         // a lock will not be detected
 750         if ( !hud_lock_target_in_range() ) {
 751                 Player->target_in_lock_cone = 0;
 752         }
 753
 754         // If locking on a subsystem, and not in sight... can't lock
 755         //      Changed by MK on 4/3/98.  It was confusing me that my hornets would not lock on my target.
 756         //      It will now be confusing that they lock, but don't home on your subsystem, but I think that's preferable.
 757         //      Often you really care about destroying the target, not just the subsystem.
 758         /*if ( Player_ai->targeted_subsys ) {
 759                 if ( !hud_lock_on_subsys_ok() ) {
 760                         Player->target_in_lock_cone=0;
 761                 }
 762         }*/
 763
 764         if ( !Player->target_in_lock_cone ) {
 765                 Player->locking_on_center=0;
 766                 Player->locking_subsys_parent=-1;
 767                 Player->locking_subsys=NULL;
 768         }
 769
 770         hud_calculate_lock_position(frametime);
 771
 772         if (!Players[Player_num].lock_indicator_visible)
 773                 return;
 774
 775         if (Player_ai->current_target_is_locked) {
 776                 if ( Missile_track_loop > -1 )  {
 777                         snd_chg_loop_status(Missile_track_loop, 0);
 778                         Missile_track_loop = -1;
 779                         Missile_lock_loop = snd_play(&Snds[SND_MISSILE_LOCK]);
 780                 }
 781         }
 782         else {
 783                 Player_ai->ai_flags |= AIF_SEEK_LOCK;           // set this flag so multiplayer's properly track lock on other ships
 784                 if ( Missile_lock_loop != -1 && snd_is_playing(Missile_lock_loop) ) {
 785                         snd_stop(Missile_lock_loop);
 786                         Missile_lock_loop = -1;
 787                 }
 788         }
 789 }
 790
 791 // hud_draw_lock_triangles() will draw the 4 rotating triangles around a lock indicator
 792 // (This is done when a lock has been acquired)
 793 #define ROTATE_DELAY 40
 794 void hud_draw_lock_triangles_old(int center_x, int center_y, int radius)
 795 {
 796         static float ang = 0.0f;
 797
 798         float end_ang = ang + 2*PI;
 799         float x3,y3,x4,y4,xpos,ypos;
 800
 801         if ( timestamp_elapsed(Rotate_time_id) ) {
 802                 Rotate_time_id = timestamp(ROTATE_DELAY);
 803                 ang += PI/12;
 804         }
 805
 806         for (; ang <= end_ang; ang += PI/2.0f) {
 807
 808                 // draw the orbiting triangles
 809
 810                 //ang = atan2(target_point.y,target_point.x);
 811                 xpos = center_x + (float)cos(ang)*(radius + Lock_triangle_height[gr_screen.res] + 2);
 812                 ypos = center_y - (float)sin(ang)*(radius + Lock_triangle_height[gr_screen.res] + 2);
 813
 814                 x3 = xpos - Lock_triangle_base[gr_screen.res] * (float)sin(-ang);
 815                 y3 = ypos + Lock_triangle_base[gr_screen.res] * (float)cos(-ang);
 816                 x4 = xpos + Lock_triangle_base[gr_screen.res] * (float)sin(-ang);
 817                 y4 = ypos - Lock_triangle_base[gr_screen.res] * (float)cos(-ang);
 818
 819                 xpos = xpos - Lock_triangle_base[gr_screen.res] * (float)cos(ang);
 820                 ypos = ypos + Lock_triangle_base[gr_screen.res] * (float)sin(ang);
 821
 822                 hud_tri(x3, y3, xpos, ypos, x4, y4);
 823         } // end for
 824 }
 825
 826 // draw a frame of the rotating lock triangles animation
 827 void hud_draw_lock_triangles(int center_x, int center_y, float frametime)
 828 {
 829         if ( Lock_anim.first_frame == -1 ) {
 830                 hud_draw_lock_triangles_old(center_x, center_y, Lock_target_box_width[gr_screen.res]/2);
 831         } else {
 832                 // render the anim
 833                 Lock_anim.sx = center_x - Lockspin_half_w[gr_screen.res];
 834                 Lock_anim.sy = center_y - Lockspin_half_h[gr_screen.res];
 835
 836                 // if its still animating
 837                 if(Lock_anim.time_elapsed < Lock_anim.total_time){
 838                         hud_anim_render(&Lock_anim, frametime, 1, 0, 1);
 839                 } else {
 840                         // if the timestamp is unset or expired
 841                         if((Lock_gauge_draw_stamp < 0) || timestamp_elapsed(Lock_gauge_draw_stamp)){
 842                                 // reset timestamp
 843                                 Lock_gauge_draw_stamp = timestamp(1000 / (2 * LOCK_GAUGE_BLINK_RATE));
 844
 845                                 // switch between draw and dont-draw
 846                                 Lock_gauge_draw = !Lock_gauge_draw;
 847                         }
 848
 849                         // maybe draw the anim
 850                         Lock_gauge.time_elapsed = 0.0f;
 851                         if(Lock_gauge_draw){
 852                                 hud_anim_render(&Lock_anim, frametime, 1, 0, 1);
 853                         }
 854                 }
 855         }
 856 }
 857
 858 // hud_calculate_lock_position()  will determine where on the screen to draw the lock
 859 // indicator, and will determine when a lock has occurred.  If the lock indicator is not
 860 // on the screen yet, hud_calculate_lock_start_pos() is called to pick a starting location
 861 void hud_calculate_lock_position(float frametime)
 862 {
 863         ship_weapon *swp;
 864         weapon_info     *wip;
 865
 866         static float pixels_moved_while_locking;
 867         static float pixels_moved_while_degrading;
 868         static int Need_new_start_pos = 0;
 869
 870         static double accumulated_x_pixels, accumulated_y_pixels;
 871         double int_portion;
 872
 873         static float last_dist_to_target;
 874
 875         static int catching_up;
 876
 877         static int maintain_lock_count = 0;
 878
 879         static float catch_up_distance = 0.0f;
 880
 881         double hypotenuse, delta_x, delta_y;
 882
 883         swp = &Player_ship->weapons;
 884         wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
 885
 886         if (Player->target_in_lock_cone) {
 887                 if (!Players[Player_num].lock_indicator_visible) {
 888                         hud_calculate_lock_start_pos();
 889                         last_dist_to_target = 0.0f;
 890
 891                         Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
 892                         Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
 893                         Players[Player_num].lock_indicator_visible = 1;
 894
 895                         Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
 896                         catching_up = 0;
 897                 }
 898
 899                 Need_new_start_pos = 1;
 900
 901                 if (Player_ai->current_target_is_locked) {
 902                         Players[Player_num].lock_indicator_x = Player->current_target_sx;
 903                         Players[Player_num].lock_indicator_y = Player->current_target_sy;
 904                         return;
 905                 }
 906
 907                 delta_x = Players[Player_num].lock_indicator_x - Player->current_target_sx;
 908                 delta_y = Players[Player_num].lock_indicator_y - Player->current_target_sy;
 909
 910                 if (!delta_y && !delta_x) {
 911                         hypotenuse = 0.0f;
 912                 }
 913                 else {
 914                         hypotenuse = _hypot(delta_y, delta_x);
 915                 }
 916
 917                 Players[Player_num].lock_dist_to_target = (float)hypotenuse;
 918
 919                 if (last_dist_to_target == 0) {
 920                         last_dist_to_target = Players[Player_num].lock_dist_to_target;
 921                 }
 922
 923                 //nprintf(("Alan","dist to target: %.2f\n",Players[Player_num].lock_dist_to_target));
 924                 //nprintf(("Alan","last to target: %.2f\n\n",last_dist_to_target));
 925
 926                 if (catching_up) {
 927                         //nprintf(("Alan","IN CATCH UP MODE  catch_up_dist is %.2f\n",catch_up_distance));
 928                         if ( Players[Player_num].lock_dist_to_target < catch_up_distance )
 929                                 catching_up = 0;
 930                 }
 931                 else {
 932                         //nprintf(("Alan","IN NORMAL MODE\n"));
 933                         if ( (Players[Player_num].lock_dist_to_target - last_dist_to_target) > 2.0f ) {
 934                                 catching_up = 1;
 935                                 catch_up_distance = last_dist_to_target + wip->catchup_pixel_penalty;
 936                         }
 937                 }
 938
 939                 last_dist_to_target = Players[Player_num].lock_dist_to_target;
 940
 941                 if (!catching_up) {
 942                         Players[Player_num].lock_time_to_target -= frametime;
 943                         if (Players[Player_num].lock_time_to_target < 0.0f)
 944                                 Players[Player_num].lock_time_to_target = 0.0f;
 945                 }
 946
 947                 float lock_pixels_per_sec;
 948                 if (Players[Player_num].lock_time_to_target > 0) {
 949                         lock_pixels_per_sec = Players[Player_num].lock_dist_to_target / Players[Player_num].lock_time_to_target;
 950                 } else {
 951                         lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
 952                 }
 953
 954                 if (lock_pixels_per_sec > wip->lock_pixels_per_sec) {
 955                         lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
 956                 }
 957
 958                 if (catching_up) {
 959                         pixels_moved_while_locking = wip->catchup_pixels_per_sec * frametime;
 960                 } else {
 961                         pixels_moved_while_locking = lock_pixels_per_sec * frametime;
 962                 }
 963
 964                 if (delta_x != 0) {
 965                         accumulated_x_pixels += pixels_moved_while_locking * delta_x/hypotenuse;
 966                 }
 967
 968                 if (delta_y != 0) {
 969                         accumulated_y_pixels += pixels_moved_while_locking * delta_y/hypotenuse;
 970                 }
 971
 972                 if (fl_abs(accumulated_x_pixels) > 1.0f) {
 973                         modf(accumulated_x_pixels, &int_portion);
 974
 975                         Players[Player_num].lock_indicator_x -= (int)int_portion;
 976
 977                         if ( fl_abs(Players[Player_num].lock_indicator_x - Player->current_target_sx) < fl_abs(int_portion) )
 978                                 Players[Player_num].lock_indicator_x = Player->current_target_sx;
 979
 980                         accumulated_x_pixels -= int_portion;
 981                 }
 982
 983                 if (fl_abs(accumulated_y_pixels) > 1.0f) {
 984                         modf(accumulated_y_pixels, &int_portion);
 985
 986                         Players[Player_num].lock_indicator_y -= (int)int_portion;
 987
 988                         if ( fl_abs(Players[Player_num].lock_indicator_y - Player->current_target_sy) < fl_abs(int_portion) )
 989                                 Players[Player_num].lock_indicator_y = Player->current_target_sy;
 990
 991                         accumulated_y_pixels -= int_portion;
 992                 }
 993
 994                 if ( Missile_track_loop == -1 ) {
 995                         Missile_track_loop = snd_play_looping( &Snds[SND_MISSILE_TRACKING], 0.0f , -1, -1);
 996                 }
 997
 998                 if (!Players[Player_num].lock_time_to_target) {
 999                         if ( (Players[Player_num].lock_indicator_x == Player->current_target_sx) && (Players[Player_num].lock_indicator_y == Player->current_target_sy) ) {
1000                                 if (maintain_lock_count++ > 1) {
1001                                         Player_ai->current_target_is_locked = 1;
1002                                 }
1003                         } else {
1004                                 maintain_lock_count = 0;
1005                         }
1006                 }
1007
1008         } else {
1009
1010                 if ( Missile_track_loop > -1 )  {
1011                         snd_chg_loop_status(Missile_track_loop, 0);
1012                         Missile_track_loop = -1;
1013                 }
1014
1015                 Player_ai->current_target_is_locked = 0;
1016
1017                 if (!Players[Player_num].lock_indicator_visible) {
1018                         return;
1019                 }
1020
1021                 catching_up = 0;
1022                 last_dist_to_target = 0.0f;
1023
1024                 if (Need_new_start_pos) {
1025                         hud_calculate_lock_start_pos();
1026                         Need_new_start_pos = 0;
1027                         accumulated_x_pixels = 0.0f;
1028                         accumulated_y_pixels = 0.0f;
1029                 }
1030
1031                 delta_x = Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x;
1032                 delta_y = Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y;
1033
1034                 if (!delta_y && !delta_x) {
1035                         hypotenuse = 0.0f;
1036                 }
1037                 else {
1038                         hypotenuse = _hypot(delta_y, delta_x);
1039                 }
1040
1041                 Players[Player_num].lock_time_to_target += frametime;
1042
1043                 if (Players[Player_num].lock_time_to_target > wip->min_lock_time)
1044                         Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
1045
1046                 pixels_moved_while_degrading = 2.0f * wip->lock_pixels_per_sec * frametime;
1047
1048                 if (delta_x != 0)
1049                         accumulated_x_pixels += pixels_moved_while_degrading * delta_x/hypotenuse;
1050
1051                 if (delta_y != 0)
1052                         accumulated_y_pixels += pixels_moved_while_degrading * delta_y/hypotenuse;
1053
1054                 if (fl_abs(accumulated_x_pixels) > 1.0f) {
1055                         modf(accumulated_x_pixels, &int_portion);
1056
1057                         Players[Player_num].lock_indicator_x -= (int)int_portion;
1058
1059                         if ( fl_abs(Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x) < fl_abs(int_portion) )
1060                                 Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
1061
1062                         accumulated_x_pixels -= int_portion;
1063                 }
1064
1065                 if (fl_abs(accumulated_y_pixels) > 1.0f) {
1066                         modf(accumulated_y_pixels, &int_portion);
1067
1068                         Players[Player_num].lock_indicator_y -= (int)int_portion;
1069
1070                         if ( fl_abs(Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y) < fl_abs(int_portion) )
1071                                 Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
1072
1073                         accumulated_y_pixels -= int_portion;
1074                 }
1075
1076                 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) ) {
1077                         Players[Player_num].lock_indicator_visible = 0;
1078                 }
1079         }
1080 }
1081
1082 // hud_calculate_lock_start_pos() will determine where to draw the starting location of the lock
1083 // indicator.  It does this by picking a location that is Lock_start_dist pixels away from the current
1084 // target (in 2D).  This is accomplished by finding the endpoint of a line that passes through the
1085 // origin, and connects the target and lock indicator postion (and has a magnitude of Lock_start_dist)
1086 void hud_calculate_lock_start_pos()
1087 {
1088         double hypotenuse;
1089         double delta_y;
1090         double delta_x;
1091         double target_mag, target_x, target_y;
1092
1093         delta_x = Player->current_target_sx - SCREEN_CENTER_X;
1094         delta_y = Player->current_target_sy - SCREEN_CENTER_Y;
1095
1096         if (!delta_x && !delta_y) {
1097                 Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X + Lock_start_dist);
1098                 Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y);
1099                 return;
1100         }
1101
1102         hypotenuse = _hypot(delta_y, delta_x);
1103
1104         if (hypotenuse >= Lock_start_dist) {
1105                 Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X);
1106                 Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y);
1107                 return;
1108         }
1109
1110         target_mag = Lock_start_dist - hypotenuse;
1111         target_x = target_mag * (delta_x / hypotenuse);
1112         target_y = target_mag * (delta_y / hypotenuse);
1113
1114         Players[Player_num].lock_indicator_start_x = fl2i(SCREEN_CENTER_X - target_x);
1115         Players[Player_num].lock_indicator_start_y = fl2i(SCREEN_CENTER_Y - target_y);
1116
1117         if (Players[Player_num].lock_indicator_start_x > gr_screen.clip_right)
1118                 Players[Player_num].lock_indicator_start_x = gr_screen.clip_right;
1119
1120         if (Players[Player_num].lock_indicator_start_y > gr_screen.clip_bottom)
1121                 Players[Player_num].lock_indicator_start_y = gr_screen.clip_bottom;
1122
1123         if (Players[Player_num].lock_indicator_start_x < gr_screen.clip_left)
1124                 Players[Player_num].lock_indicator_start_x = gr_screen.clip_left;
1125
1126         if (Players[Player_num].lock_indicator_start_y < gr_screen.clip_top)
1127                 Players[Player_num].lock_indicator_start_y = gr_screen.clip_top;
1128 }
1129
1130 // hud_stop_looped_locking_sounds() will terminate any hud related looping sounds that are playing
1131 void hud_stop_looped_locking_sounds()
1132 {
1133         if ( Missile_track_loop > -1 )  {
1134                 snd_stop(Missile_track_loop);
1135                 Missile_track_loop = -1;
1136         }
1137 }
1138
1139 // Get a new world pos for the locking point
1140 void hud_lock_update_lock_pos(object *target_objp, vector *lock_world_pos)
1141 {
1142         if ( Player_ai->targeted_subsys ) {
1143                 get_subsystem_world_pos(target_objp, Player_ai->targeted_subsys, lock_world_pos);
1144                 return;
1145         }
1146
1147         if ( Player->locking_on_center ) {
1148                 *lock_world_pos = target_objp->pos;
1149         } else {
1150                 Assert(Player->locking_subsys);
1151                 get_subsystem_world_pos(target_objp, Player->locking_subsys, lock_world_pos);
1152         }
1153 }
1154
1155 // Try and find a new locking point
1156 void hud_lock_get_new_lock_pos(object *target_objp, vector *lock_world_pos)
1157 {
1158         ship                    *target_shipp=NULL;
1159         int                     lock_in_range=0;
1160         float                   best_lock_dot=-1.0f, lock_dot=-1.0f;
1161         ship_subsys     *ss;
1162         vector          subsys_world_pos, vec_to_lock;
1163
1164         if ( target_objp->type == OBJ_SHIP ) {
1165                 target_shipp = &Ships[target_objp->instance];
1166         }
1167
1168         // if a large ship, lock to pos closest to center and within range
1169         if ( (target_shipp) && (Ship_info[target_shipp->ship_info_index].flags & (SIF_BIG_SHIP|SIF_HUGE_SHIP)) ) {
1170                 // check all the subsystems and the center of the ship
1171
1172                 // assume best lock pos is the center of the ship
1173                 *lock_world_pos=target_objp->pos;
1174                 Player->locking_on_center=1;
1175                 Player->locking_subsys=NULL;
1176                 Player->locking_subsys_parent=-1;
1177                 lock_in_range = hud_lock_world_pos_in_range(lock_world_pos, &vec_to_lock);
1178                 vm_vec_normalize(&vec_to_lock);
1179                 if ( lock_in_range ) {
1180                         best_lock_dot=vm_vec_dot(&Player_obj->orient.v.fvec, &vec_to_lock);
1181                 }
1182                 // take center if reasonable dot
1183                 if ( best_lock_dot > 0.95 ) {
1184                         return;
1185                 }
1186
1187                 // iterate through subsystems to see if we can get a better choice
1188                 ss = GET_FIRST(&target_shipp->subsys_list);
1189                 while ( ss != END_OF_LIST( &target_shipp->subsys_list ) ) {
1190
1191                         // get world pos of subsystem
1192                         get_subsystem_world_pos(target_objp, ss, &subsys_world_pos);
1193
1194                         if ( hud_lock_world_pos_in_range(&subsys_world_pos, &vec_to_lock) ) {
1195                                 vm_vec_normalize(&vec_to_lock);
1196                                 lock_dot=vm_vec_dot(&Player_obj->orient.v.fvec, &vec_to_lock);
1197                                 if ( lock_dot > best_lock_dot ) {
1198                                         best_lock_dot=lock_dot;
1199                                         Player->locking_on_center=0;
1200                                         Player->locking_subsys=ss;
1201                                         Player->locking_subsys_parent=Player_ai->target_objnum;
1202                                         *lock_world_pos=subsys_world_pos;
1203                                 }
1204                         }
1205                         ss = GET_NEXT( ss );
1206                 }
1207         } else {
1208                 // if small ship (or weapon), just go for the center
1209                 *lock_world_pos = target_objp->pos;
1210                 Player->locking_on_center=1;
1211                 Player->locking_subsys=NULL;
1212                 Player->locking_subsys_parent=-1;
1213         }
1214 }
1215
1216 // Decide which point lock should be homing on
1217 void hud_lock_determine_lock_point(vector *lock_world_pos_out)
1218 {
1219         vector  lock_world_pos;
1220         vertex  lock_point;
1221         object  *target_objp;
1222
1223         Assert(Player_ai->target_objnum >= 0);
1224         target_objp = &Objects[Player_ai->target_objnum];
1225
1226         Player->current_target_sx = -1;
1227         Player->current_target_sx = -1;
1228
1229         // If subsystem is targeted, we must try to lock on that
1230         if ( Player_ai->targeted_subsys ) {
1231                 hud_lock_update_lock_pos(target_objp, &lock_world_pos);
1232                 Player->locking_on_center=0;
1233                 Player->locking_subsys=NULL;
1234                 Player->locking_subsys_parent=-1;
1235         } else {
1236                 // See if we already have a successful locked point
1237                 if ( hud_lock_has_homing_point() ) {
1238                         hud_lock_update_lock_pos(target_objp, &lock_world_pos);
1239                 } else {
1240                         hud_lock_get_new_lock_pos(target_objp, &lock_world_pos);
1241                 }
1242         }
1243
1244         *lock_world_pos_out=lock_world_pos;
1245
1246         g3_rotate_vertex(&lock_point,&lock_world_pos);
1247         g3_project_vertex(&lock_point);
1248
1249         if (!(lock_point.flags & PF_OVERFLOW)) {  // make sure point projected
1250                 Player->current_target_sx = (int)lock_point.sx;
1251                 Player->current_target_sy = (int)lock_point.sy;
1252         }
1253 }
1254
1255 void hudlock_page_in()
1256 {
1257         bm_page_in_aabitmap( Lock_gauge.first_frame, Lock_gauge.num_frames );
1258 }