src/object/collidedebrisship.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/Object/CollideDebrisShip.cpp $
  11  * $Revision$
  12  * $Date$
  13  * $Author$
  14  *
  15  * Routines to detect collisions and do physics, damage, etc for ships and debris
  16  *
  17  * $Log$
  18  * Revision 1.5  2002/06/18 08:58:53  relnev
  19  * last few struct changes
  20  *
  21  * Revision 1.4  2002/06/17 06:33:10  relnev
  22  * ryan's struct patch for gcc 2.95
  23  *
  24  * Revision 1.3  2002/06/09 04:41:24  relnev
  25  * added copyright header
  26  *
  27  * Revision 1.2  2002/05/03 13:34:33  theoddone33
  28  * More stuff compiles
  29  *
  30  * Revision 1.1.1.1  2002/05/03 03:28:10  root
  31  * Initial import.
  32  *
  33  *
  34  * 12    9/14/99 2:59a Andsager
  35  * Limit amount of damage done by debris colliding with ship for SUPERCAP
  36  *
  37  * 11    8/31/99 11:43p Andsager
  38  * No ship:debris damage to ship if debris' parent is ship itself
  39  *
  40  * 10    8/10/99 5:49p Andsager
  41  * Fix bug - no damage collision against debris.
  42  *
  43  * 9     8/09/99 4:45p Andsager
  44  * Add HUD "collision " waring when colliding with asteroids and debris.
  45  *
  46  * 8     7/15/99 9:20a Andsager
  47  * FS2_DEMO initial checkin
  48  *
  49  * 7     6/14/99 3:21p Andsager
  50  * Allow collisions between ship and its debris.  Fix up collision pairs
  51  * when large ship is warping out.
  52  *
  53  * 6     1/12/99 10:24a Andsager
  54  * Fix asteroid-ship collision bug, with negative collision
  55  *
  56  * 5     10/23/98 1:11p Andsager
  57  * Make ship sparks emit correctly from rotating structures.
  58  *
  59  * 4     10/20/98 1:39p Andsager
  60  * Make so sparks follow animated ship submodels.  Modify
  61  * ship_weapon_do_hit_stuff() and ship_apply_local_damage() to add
  62  * submodel_num.  Add submodel_num to multiplayer hit packet.
  63  *
  64  * 3     10/16/98 1:22p Andsager
  65  * clean up header files
  66  *
  67  * 2     10/07/98 10:53a Dave
  68  * Initial checkin.
  69  *
  70  * 1     10/07/98 10:50a Dave
  71  *
  72  * 27    4/24/98 5:35p Andsager
  73  * Fix sparks sometimes drawing not on model.  If ship is sphere in
  74  * collision, don't draw sparks.  Modify ship_apply_local_damage() to take
  75  * parameter no_spark.
  76  *
  77  * 26    4/02/98 6:29p Lawrance
  78  * compile out asteroid references for demo
  79  *
  80  * 25    4/02/98 5:10p Mike
  81  * Decrease damage yet more (by 3x) when an asteroid collides with a ship
  82  * during warp out.
  83  *
  84  * 24    4/02/98 4:25p Andsager
  85  * fix bug calculating max_ship_impulse
  86  *
  87  * 23    3/30/98 10:35a Andsager
  88  * Attempt to optimize ship:asteroid collisions.  Maybe return if time.
  89  *
  90  * 22    3/25/98 2:37p Andsager
  91  * Modify maximum damage done by asteroids, depends on ship's max_vel, not
  92  * vel when warping out.
  93  *
  94  * 21    3/25/98 2:15p Andsager
  95  *
  96  * 20    3/25/98 1:36p Mike
  97  * Balancing of sm1-06a, Galatea mission.
  98  *
  99  * 19    3/23/98 11:14a Andsager
 100  * Modified collide_asteroid_ship to calculate next possible collision
 101  * time based on ship afterburner speed.
 102  *
 103  * 18    3/20/98 12:02a Mike
 104  * Cap damage done by an asteroid on a huge ship to 1/8 ship strength if a
 105  * large ship.  If <4000 hull, can do more than 1/8.
 106  *
 107  * 17    3/05/98 3:12p Mike
 108  * Fix bugs in asteroid collisions.  Throw asteroids at Galataea (needs to
 109  * be made general).  Add skill level support for asteroid throwing.
 110  *
 111  * 16    3/04/98 11:21p Mike
 112  * Less rotation on huge ships in death roll.
 113  * Less damage done to huge ships when hit an asteroid at high speed.
 114  *
 115  * 15    3/02/98 2:58p Mike
 116  * Make "asteroids" in debug console turn asteroids on/off.
 117  *
 118  * 14    2/19/98 12:46a Lawrance
 119  * Further work on asteroids.
 120  *
 121  * 13    2/07/98 2:14p Mike
 122  * Improve asteroid splitting.  Add ship:asteroid collisions.  Timestamp
 123  * ship:debris collisions.
 124  *
 125  * 12    2/06/98 7:29p John
 126  * Added code to cull out some future asteroid-ship collisions.
 127  *
 128  * 11    2/05/98 12:51a Mike
 129  * Early asteroid stuff.
 130  *
 131  * 10    2/04/98 8:57p Lawrance
 132  * remove unused variable
 133  *
 134  * 9     2/04/98 6:08p Lawrance
 135  * Add a light collision sound, overlay a shield collide sound if
 136  * applicable.
 137  *
 138  * 8     1/05/98 9:07p Andsager
 139  * Changed ship_shipor_debris_hit_info struct to more meaninful names
 140  *
 141  * 7     1/02/98 9:08a Andsager
 142  * Changed ship:ship and ship:debris collision detection to ignore shields
 143  * and collide only against hull.  Also, significantly reduced radius of
 144  * sphere.
 145  *
 146  * 6     12/22/97 9:56p Andsager
 147  * Implement ship:debris collisions.  Generalize and move
 148  * ship_ship_or_debris_hit struct from CollideShipShip to ObjCollide.h
 149  *
 150  * 5     11/03/97 11:08p Lawrance
 151  * play correct collision sounds.
 152  *
 153  * 4     10/27/97 8:35a John
 154  * code for new player warpout sequence
 155  *
 156  * 3     10/01/97 5:55p Lawrance
 157  * change call to snd_play_3d() to allow for arbitrary listening position
 158  *
 159  * 2     9/17/97 5:12p John
 160  * Restructured collision routines.  Probably broke a lot of stuff.
 161  *
 162  * 1     9/17/97 2:14p John
 163  * Initial revision
 164  *
 165  * $NoKeywords: $
 166  */
 167
 168
 169 #include "objcollide.h"
 170 #include "ship.h"
 171 #include "debris.h"
 172 #include "player.h"
 173 #include "shiphit.h"
 174 #include "timer.h"
 175 #include "asteroid.h"
 176 #include "hud.h"
 177
 178 void calculate_ship_ship_collision_physics(collision_info_struct *ship_ship_hit_info);
 179
 180 /*
 181 extern int Framecount;
 182 int Debris_ship_count = 0;
 183 */
 184
 185 // Checks debris-ship collisions.  pair->a is debris and pair->b is ship.
 186 // Returns 1 if all future collisions between these can be ignored
 187 int collide_debris_ship( obj_pair * pair )
 188 {
 189         float dist;
 190         object *pdebris = pair->a;
 191         object *pship = pair->b;
 192
 193                 // Don't check collisions for warping out player
 194         if ( Player->control_mode != PCM_NORMAL )       {
 195                 if ( pship == Player_obj )
 196                         return 0;
 197         }
 198
 199         Assert( pdebris->type == OBJ_DEBRIS );
 200         Assert( pship->type == OBJ_SHIP );
 201
 202 /*      Debris_ship_count++;
 203         if (Debris_ship_count % 100 == 0)
 204                 nprintf(("AI", "Done %i debris:ship checks in %i frames = %.2f checks/frame\n", Debris_ship_count, Framecount, (float) Debris_ship_count/Framecount));
 205 */
 206         dist = vm_vec_dist( &pdebris->pos, &pship->pos );
 207         if ( dist < pdebris->radius + pship->radius )   {
 208                 int hit;
 209                 vector  hitpos;
 210                 // create and initialize ship_ship_hit_info struct
 211                 collision_info_struct debris_hit_info;
 212                 memset( &debris_hit_info, -1, sizeof(collision_info_struct) );
 213
 214                 if ( pdebris->phys_info.mass > pship->phys_info.mass ) {
 215                         debris_hit_info.heavy = pdebris;
 216                         debris_hit_info.light = pship;
 217                 } else {
 218                         debris_hit_info.heavy = pship;
 219                         debris_hit_info.light = pdebris;
 220                 }
 221
 222                 hit = debris_check_collision(pdebris, pship, &hitpos, &debris_hit_info );
 223                 if ( hit ) {
 224                         float           ship_damage;
 225                         float           debris_damage;
 226
 227                         // do collision physics
 228                         calculate_ship_ship_collision_physics( &debris_hit_info );
 229
 230                         if ( debris_hit_info.impulse < 0.5f )
 231                                 return 0;
 232
 233                         // calculate ship damage
 234                         ship_damage = 0.005f * debris_hit_info.impulse; //      Cut collision-based damage in half.
 235                         //      Decrease heavy damage by 2x.
 236                         if (ship_damage > 5.0f)
 237                                 ship_damage = 5.0f + (ship_damage - 5.0f)/2.0f;
 238
 239                         // calculate debris damage and set debris damage to greater or debris and ship
 240                         // debris damage is needed since we can really whack some small debris with afterburner and not do
 241                         // significant damage to ship but the debris goes off faster than afterburner speed.
 242                         debris_damage = debris_hit_info.impulse/pdebris->phys_info.mass;        // ie, delta velocity of debris
 243                         debris_damage = (debris_damage > ship_damage) ? debris_damage : ship_damage;
 244
 245                         // supercaps cap damage at 10-20% max hull ship damage
 246                         if (Ship_info[Ships[pship->instance].ship_info_index].flags & SIF_SUPERCAP) {
 247                                 float cap_percent_damage = frand_range(0.1f, 0.2f);
 248                                 ship_damage = min(ship_damage, cap_percent_damage * Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength);
 249                         }
 250
 251                         // apply damage to debris
 252                         debris_hit( pdebris, pship, &hitpos, debris_damage);            // speed => damage
 253                         int quadrant_num, apply_ship_damage;
 254
 255                         // apply damage to ship unless 1) debris is from ship
 256                         // apply_ship_damage = !((pship->signature == pdebris->parent_sig) && ship_is_beginning_warpout_speedup(pship));
 257                         apply_ship_damage = !(pship->signature == pdebris->parent_sig);
 258
 259                         if ( debris_hit_info.heavy == pship ) {
 260                                 quadrant_num = get_ship_quadrant_from_global(&hitpos, pship);
 261                                 if ((pship->flags & OF_NO_SHIELDS) || !ship_is_shield_up(pship, quadrant_num) ) {
 262                                         quadrant_num = -1;
 263                                 }
 264                                 if (apply_ship_damage) {
 265                                         ship_apply_local_damage(debris_hit_info.heavy, debris_hit_info.light, &hitpos, ship_damage, quadrant_num, CREATE_SPARKS, debris_hit_info.submodel_num);
 266                                 }
 267                         } else {
 268                                 // don't draw sparks using sphere hit position
 269                                 if (apply_ship_damage) {
 270                                         ship_apply_local_damage(debris_hit_info.light, debris_hit_info.heavy, &hitpos, ship_damage, MISS_SHIELDS, NO_SPARKS);
 271                                 }
 272                         }
 273
 274                         // maybe print Collision on HUD
 275                         if ( pship == Player_obj ) {
 276                                 hud_start_text_flash(XSTR("Collision", 1431), 2000);
 277                         }
 278
 279                         collide_ship_ship_do_sound(&hitpos, pship, pdebris, pship==Player_obj);
 280
 281                         return 0;
 282                 }
 283         } else {        //      Bounding spheres don't intersect, set timestamp for next collision check.
 284                 float   ship_max_speed, debris_speed;
 285                 float   time;
 286                 ship *shipp;
 287
 288                 shipp = &Ships[pship->instance];
 289
 290                 if (ship_is_beginning_warpout_speedup(pship)) {
 291                         ship_max_speed = max(ship_get_max_speed(shipp), ship_get_warp_speed(pship));
 292                 } else {
 293                         ship_max_speed = ship_get_max_speed(shipp);
 294                 }
 295                 ship_max_speed = max(ship_max_speed, 10.0f);
 296                 ship_max_speed = max(ship_max_speed, pship->phys_info.vel.xyz.z);
 297
 298                 debris_speed = pdebris->phys_info.speed;
 299
 300                 time = 1000.0f * (dist - pship->radius - pdebris->radius - 10.0f) / (ship_max_speed + debris_speed);            // 10.0f is a safety factor
 301                 time -= 200.0f;         // allow one frame slow frame at ~5 fps
 302
 303                 if (time > 100) {
 304                         //nprintf(("AI", "Ship %s debris #%i delay time = %.1f seconds\n", Ships[pship->instance].ship_name, pdebris-Objects, time/1000.0f));
 305                         pair->next_check_time = timestamp( fl2i(time) );
 306                 } else {
 307                         pair->next_check_time = timestamp(0);   // check next time
 308                 }
 309         }
 310
 311         return 0;
 312 }
 313
 314 // Checks asteroid-ship collisions.  pair->a is asteroid and pair->b is ship.
 315 // Returns 1 if all future collisions between these can be ignored
 316 int collide_asteroid_ship( obj_pair * pair )
 317 {
 318 #ifndef FS2_DEMO
 319
 320         if (!Asteroids_enabled)
 321                 return 0;
 322
 323         float           dist;
 324         object  *pasteroid = pair->a;
 325         object  *pship = pair->b;
 326
 327                 // Don't check collisions for warping out player
 328         if ( Player->control_mode != PCM_NORMAL )       {
 329                 if ( pship == Player_obj ) return 0;
 330         }
 331
 332         if (pasteroid->hull_strength < 0.0f)
 333                 return 0;
 334
 335         Assert( pasteroid->type == OBJ_ASTEROID );
 336         Assert( pship->type == OBJ_SHIP );
 337
 338         dist = vm_vec_dist( &pasteroid->pos, &pship->pos );
 339
 340         if ( dist < pasteroid->radius + pship->radius ) {
 341                 int hit;
 342                 vector  hitpos;
 343                 // create and initialize ship_ship_hit_info struct
 344                 collision_info_struct asteroid_hit_info;
 345                 memset( &asteroid_hit_info, -1, sizeof(collision_info_struct) );
 346
 347                 if ( pasteroid->phys_info.mass > pship->phys_info.mass ) {
 348                         asteroid_hit_info.heavy = pasteroid;
 349                         asteroid_hit_info.light = pship;
 350                 } else {
 351                         asteroid_hit_info.heavy = pship;
 352                         asteroid_hit_info.light = pasteroid;
 353                 }
 354
 355                 hit = asteroid_check_collision(pasteroid, pship, &hitpos, &asteroid_hit_info );
 356                 if ( hit ) {
 357                         float           ship_damage;
 358                         float           asteroid_damage;
 359
 360                         vector asteroid_vel = pasteroid->phys_info.vel;
 361
 362                         // do collision physics
 363                         calculate_ship_ship_collision_physics( &asteroid_hit_info );
 364
 365                         if ( asteroid_hit_info.impulse < 0.5f )
 366                                 return 0;
 367
 368                         // limit damage from impulse by making max impulse (for damage) 2*m*v_max_relative
 369                         float max_ship_impulse = (2.0f*pship->phys_info.max_vel.xyz.z+vm_vec_mag_quick(&asteroid_vel)) *
 370                                 (pship->phys_info.mass*pasteroid->phys_info.mass) / (pship->phys_info.mass + pasteroid->phys_info.mass);
 371
 372                         if (asteroid_hit_info.impulse > max_ship_impulse) {
 373                                 ship_damage = 0.001f * max_ship_impulse;
 374                         } else {
 375                                 ship_damage = 0.001f * asteroid_hit_info.impulse;       //      Cut collision-based damage in half.
 376                         }
 377
 378                         //      Decrease heavy damage by 2x.
 379                         if (ship_damage > 5.0f)
 380                                 ship_damage = 5.0f + (ship_damage - 5.0f)/2.0f;
 381
 382                         if ((ship_damage > 500.0f) && (ship_damage > Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength/8.0f)) {
 383                                 ship_damage = Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength/8.0f;
 384                                 nprintf(("AI", "Pinning damage to %s from asteroid at %7.3f (%7.3f percent)\n", Ships[pship->instance].ship_name, ship_damage, 100.0f * ship_damage/Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength));
 385                         }
 386
 387                         //      Decrease damage during warp out because it's damn annoying when your escoree dies during warp out.
 388                         if (Ai_info[Ships[pship->instance].ai_index].mode == AIM_WARP_OUT)
 389                                 ship_damage /= 3.0f;
 390
 391                         //nprintf(("AI", "Asteroid damage on %s = %7.3f (%6.2f percent)\n", Ships[pship->instance].ship_name, ship_damage, 100.0f * ship_damage/Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength));
 392
 393                         // calculate asteroid damage and set asteroid damage to greater or asteroid and ship
 394                         // asteroid damage is needed since we can really whack some small asteroid with afterburner and not do
 395                         // significant damage to ship but the asteroid goes off faster than afterburner speed.
 396                         asteroid_damage = asteroid_hit_info.impulse/pasteroid->phys_info.mass;  // ie, delta velocity of asteroid
 397                         asteroid_damage = (asteroid_damage > ship_damage) ? asteroid_damage : ship_damage;
 398
 399                         // apply damage to asteroid
 400                         asteroid_hit( pasteroid, pship, &hitpos, asteroid_damage);              // speed => damage
 401
 402                         //extern fix Missiontime;
 403
 404                         int quadrant_num;
 405                         if ( asteroid_hit_info.heavy == pship ) {
 406                                 quadrant_num = get_ship_quadrant_from_global(&hitpos, pship);
 407                                 if ((pship->flags & OF_NO_SHIELDS) || !ship_is_shield_up(pship, quadrant_num) ) {
 408                                         quadrant_num = -1;
 409                                 }
 410                                 ship_apply_local_damage(asteroid_hit_info.heavy, asteroid_hit_info.light, &hitpos, ship_damage, quadrant_num, CREATE_SPARKS, asteroid_hit_info.submodel_num);
 411                                 //if (asteroid_hit_info.heavy->type == OBJ_SHIP) {
 412                                 //      nprintf(("AI", "Time = %7.3f, asteroid #%i applying %7.3f damage to ship %s\n", f2fl(Missiontime), pasteroid-Objects, ship_damage, Ships[asteroid_hit_info.heavy->instance].ship_name));
 413                                 //}
 414                         } else {
 415                                 // dont draw sparks (using sphere hitpos)
 416                                 ship_apply_local_damage(asteroid_hit_info.light, asteroid_hit_info.heavy, &hitpos, ship_damage, MISS_SHIELDS, NO_SPARKS);
 417                                 //if (asteroid_hit_info.light->type == OBJ_SHIP) {
 418                                 //      nprintf(("AI", "Time = %7.3f, asteroid #%i applying %7.3f damage to ship %s\n", f2fl(Missiontime), pasteroid-Objects, ship_damage, Ships[asteroid_hit_info.light->instance].ship_name));
 419                                 //}
 420                         }
 421
 422                         // maybe print Collision on HUD
 423                         if ( pship == Player_obj ) {
 424                                 hud_start_text_flash(XSTR("Collision", 1431), 2000);
 425                         }
 426
 427                         collide_ship_ship_do_sound(&hitpos, pship, pasteroid, pship==Player_obj);
 428
 429                         return 0;
 430                 }
 431
 432                 return 0;
 433         } else {
 434                 // estimate earliest time at which pair can hit
 435                 float asteroid_max_speed, ship_max_speed, time;
 436                 ship *shipp = &Ships[pship->instance];
 437
 438                 asteroid_max_speed = vm_vec_mag(&pasteroid->phys_info.vel);             // Asteroid... vel gets reset, not max vel.z
 439                 asteroid_max_speed = max(asteroid_max_speed, 10.0f);
 440
 441                 if (ship_is_beginning_warpout_speedup(pship)) {
 442                         ship_max_speed = max(ship_get_max_speed(shipp), ship_get_warp_speed(pship));
 443                 } else {
 444                         ship_max_speed = ship_get_max_speed(shipp);
 445                 }
 446                 ship_max_speed = max(ship_max_speed, 10.0f);
 447                 ship_max_speed = max(ship_max_speed, pship->phys_info.vel.xyz.z);
 448
 449
 450                 time = 1000.0f * (dist - pship->radius - pasteroid->radius - 10.0f) / (asteroid_max_speed + ship_max_speed);            // 10.0f is a safety factor
 451                 time -= 200.0f;         // allow one frame slow frame at ~5 fps
 452
 453                 if (time > 100) {
 454                         pair->next_check_time = timestamp( fl2i(time) );
 455                 } else {
 456                         pair->next_check_time = timestamp(0);   // check next time
 457                 }
 458                 return 0;
 459         }
 460 #else
 461         return 0;       // no asteroids in demo version
 462 #endif
 463 }
 464