src/object/collidedebrisship.cpp

   1 /*
   2  * $Logfile: /Freespace2/code/Object/CollideDebrisShip.cpp $
   3  * $Revision$
   4  * $Date$
   5  * $Author$
   6  *
   7  * Routines to detect collisions and do physics, damage, etc for ships and debris
   8  *
   9  * $Log$
  10  * Revision 1.1  2002/05/03 03:28:10  root
  11  * Initial revision
  12  *
  13  *
  14  * 12    9/14/99 2:59a Andsager
  15  * Limit amount of damage done by debris colliding with ship for SUPERCAP
  16  *
  17  * 11    8/31/99 11:43p Andsager
  18  * No ship:debris damage to ship if debris' parent is ship itself
  19  *
  20  * 10    8/10/99 5:49p Andsager
  21  * Fix bug - no damage collision against debris.
  22  *
  23  * 9     8/09/99 4:45p Andsager
  24  * Add HUD "collision " waring when colliding with asteroids and debris.
  25  *
  26  * 8     7/15/99 9:20a Andsager
  27  * FS2_DEMO initial checkin
  28  *
  29  * 7     6/14/99 3:21p Andsager
  30  * Allow collisions between ship and its debris.  Fix up collision pairs
  31  * when large ship is warping out.
  32  *
  33  * 6     1/12/99 10:24a Andsager
  34  * Fix asteroid-ship collision bug, with negative collision
  35  *
  36  * 5     10/23/98 1:11p Andsager
  37  * Make ship sparks emit correctly from rotating structures.
  38  *
  39  * 4     10/20/98 1:39p Andsager
  40  * Make so sparks follow animated ship submodels.  Modify
  41  * ship_weapon_do_hit_stuff() and ship_apply_local_damage() to add
  42  * submodel_num.  Add submodel_num to multiplayer hit packet.
  43  *
  44  * 3     10/16/98 1:22p Andsager
  45  * clean up header files
  46  *
  47  * 2     10/07/98 10:53a Dave
  48  * Initial checkin.
  49  *
  50  * 1     10/07/98 10:50a Dave
  51  *
  52  * 27    4/24/98 5:35p Andsager
  53  * Fix sparks sometimes drawing not on model.  If ship is sphere in
  54  * collision, don't draw sparks.  Modify ship_apply_local_damage() to take
  55  * parameter no_spark.
  56  *
  57  * 26    4/02/98 6:29p Lawrance
  58  * compile out asteroid references for demo
  59  *
  60  * 25    4/02/98 5:10p Mike
  61  * Decrease damage yet more (by 3x) when an asteroid collides with a ship
  62  * during warp out.
  63  *
  64  * 24    4/02/98 4:25p Andsager
  65  * fix bug calculating max_ship_impulse
  66  *
  67  * 23    3/30/98 10:35a Andsager
  68  * Attempt to optimize ship:asteroid collisions.  Maybe return if time.
  69  *
  70  * 22    3/25/98 2:37p Andsager
  71  * Modify maximum damage done by asteroids, depends on ship's max_vel, not
  72  * vel when warping out.
  73  *
  74  * 21    3/25/98 2:15p Andsager
  75  *
  76  * 20    3/25/98 1:36p Mike
  77  * Balancing of sm1-06a, Galatea mission.
  78  *
  79  * 19    3/23/98 11:14a Andsager
  80  * Modified collide_asteroid_ship to calculate next possible collision
  81  * time based on ship afterburner speed.
  82  *
  83  * 18    3/20/98 12:02a Mike
  84  * Cap damage done by an asteroid on a huge ship to 1/8 ship strength if a
  85  * large ship.  If <4000 hull, can do more than 1/8.
  86  *
  87  * 17    3/05/98 3:12p Mike
  88  * Fix bugs in asteroid collisions.  Throw asteroids at Galataea (needs to
  89  * be made general).  Add skill level support for asteroid throwing.
  90  *
  91  * 16    3/04/98 11:21p Mike
  92  * Less rotation on huge ships in death roll.
  93  * Less damage done to huge ships when hit an asteroid at high speed.
  94  *
  95  * 15    3/02/98 2:58p Mike
  96  * Make "asteroids" in debug console turn asteroids on/off.
  97  *
  98  * 14    2/19/98 12:46a Lawrance
  99  * Further work on asteroids.
 100  *
 101  * 13    2/07/98 2:14p Mike
 102  * Improve asteroid splitting.  Add ship:asteroid collisions.  Timestamp
 103  * ship:debris collisions.
 104  *
 105  * 12    2/06/98 7:29p John
 106  * Added code to cull out some future asteroid-ship collisions.
 107  *
 108  * 11    2/05/98 12:51a Mike
 109  * Early asteroid stuff.
 110  *
 111  * 10    2/04/98 8:57p Lawrance
 112  * remove unused variable
 113  *
 114  * 9     2/04/98 6:08p Lawrance
 115  * Add a light collision sound, overlay a shield collide sound if
 116  * applicable.
 117  *
 118  * 8     1/05/98 9:07p Andsager
 119  * Changed ship_shipor_debris_hit_info struct to more meaninful names
 120  *
 121  * 7     1/02/98 9:08a Andsager
 122  * Changed ship:ship and ship:debris collision detection to ignore shields
 123  * and collide only against hull.  Also, significantly reduced radius of
 124  * sphere.
 125  *
 126  * 6     12/22/97 9:56p Andsager
 127  * Implement ship:debris collisions.  Generalize and move
 128  * ship_ship_or_debris_hit struct from CollideShipShip to ObjCollide.h
 129  *
 130  * 5     11/03/97 11:08p Lawrance
 131  * play correct collision sounds.
 132  *
 133  * 4     10/27/97 8:35a John
 134  * code for new player warpout sequence
 135  *
 136  * 3     10/01/97 5:55p Lawrance
 137  * change call to snd_play_3d() to allow for arbitrary listening position
 138  *
 139  * 2     9/17/97 5:12p John
 140  * Restructured collision routines.  Probably broke a lot of stuff.
 141  *
 142  * 1     9/17/97 2:14p John
 143  * Initial revision
 144  *
 145  * $NoKeywords: $
 146  */
 147
 148
 149 #include "objcollide.h"
 150 #include "ship.h"
 151 #include "debris.h"
 152 #include "player.h"
 153 #include "shiphit.h"
 154 #include "timer.h"
 155 #include "asteroid.h"
 156 #include "hud.h"
 157
 158 void calculate_ship_ship_collision_physics(collision_info_struct *ship_ship_hit_info);
 159
 160 /*
 161 extern int Framecount;
 162 int Debris_ship_count = 0;
 163 */
 164
 165 // Checks debris-ship collisions.  pair->a is debris and pair->b is ship.
 166 // Returns 1 if all future collisions between these can be ignored
 167 int collide_debris_ship( obj_pair * pair )
 168 {
 169         float dist;
 170         object *pdebris = pair->a;
 171         object *pship = pair->b;
 172
 173                 // Don't check collisions for warping out player
 174         if ( Player->control_mode != PCM_NORMAL )       {
 175                 if ( pship == Player_obj )
 176                         return 0;
 177         }
 178
 179         Assert( pdebris->type == OBJ_DEBRIS );
 180         Assert( pship->type == OBJ_SHIP );
 181
 182 /*      Debris_ship_count++;
 183         if (Debris_ship_count % 100 == 0)
 184                 nprintf(("AI", "Done %i debris:ship checks in %i frames = %.2f checks/frame\n", Debris_ship_count, Framecount, (float) Debris_ship_count/Framecount));
 185 */
 186         dist = vm_vec_dist( &pdebris->pos, &pship->pos );
 187         if ( dist < pdebris->radius + pship->radius )   {
 188                 int hit;
 189                 vector  hitpos;
 190                 // create and initialize ship_ship_hit_info struct
 191                 collision_info_struct debris_hit_info;
 192                 memset( &debris_hit_info, -1, sizeof(collision_info_struct) );
 193
 194                 if ( pdebris->phys_info.mass > pship->phys_info.mass ) {
 195                         debris_hit_info.heavy = pdebris;
 196                         debris_hit_info.light = pship;
 197                 } else {
 198                         debris_hit_info.heavy = pship;
 199                         debris_hit_info.light = pdebris;
 200                 }
 201
 202                 hit = debris_check_collision(pdebris, pship, &hitpos, &debris_hit_info );
 203                 if ( hit ) {
 204                         float           ship_damage;
 205                         float           debris_damage;
 206
 207                         // do collision physics
 208                         calculate_ship_ship_collision_physics( &debris_hit_info );
 209
 210                         if ( debris_hit_info.impulse < 0.5f )
 211                                 return 0;
 212
 213                         // calculate ship damage
 214                         ship_damage = 0.005f * debris_hit_info.impulse; //      Cut collision-based damage in half.
 215                         //      Decrease heavy damage by 2x.
 216                         if (ship_damage > 5.0f)
 217                                 ship_damage = 5.0f + (ship_damage - 5.0f)/2.0f;
 218
 219                         // calculate debris damage and set debris damage to greater or debris and ship
 220                         // debris damage is needed since we can really whack some small debris with afterburner and not do
 221                         // significant damage to ship but the debris goes off faster than afterburner speed.
 222                         debris_damage = debris_hit_info.impulse/pdebris->phys_info.mass;        // ie, delta velocity of debris
 223                         debris_damage = (debris_damage > ship_damage) ? debris_damage : ship_damage;
 224
 225                         // supercaps cap damage at 10-20% max hull ship damage
 226                         if (Ship_info[Ships[pship->instance].ship_info_index].flags & SIF_SUPERCAP) {
 227                                 float cap_percent_damage = frand_range(0.1f, 0.2f);
 228                                 ship_damage = min(ship_damage, cap_percent_damage * Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength);
 229                         }
 230
 231                         // apply damage to debris
 232                         debris_hit( pdebris, pship, &hitpos, debris_damage);            // speed => damage
 233                         int quadrant_num, apply_ship_damage;
 234
 235                         // apply damage to ship unless 1) debris is from ship
 236                         // apply_ship_damage = !((pship->signature == pdebris->parent_sig) && ship_is_beginning_warpout_speedup(pship));
 237                         apply_ship_damage = !(pship->signature == pdebris->parent_sig);
 238
 239                         if ( debris_hit_info.heavy == pship ) {
 240                                 quadrant_num = get_ship_quadrant_from_global(&hitpos, pship);
 241                                 if ((pship->flags & OF_NO_SHIELDS) || !ship_is_shield_up(pship, quadrant_num) ) {
 242                                         quadrant_num = -1;
 243                                 }
 244                                 if (apply_ship_damage) {
 245                                         ship_apply_local_damage(debris_hit_info.heavy, debris_hit_info.light, &hitpos, ship_damage, quadrant_num, CREATE_SPARKS, debris_hit_info.submodel_num);
 246                                 }
 247                         } else {
 248                                 // don't draw sparks using sphere hit position
 249                                 if (apply_ship_damage) {
 250                                         ship_apply_local_damage(debris_hit_info.light, debris_hit_info.heavy, &hitpos, ship_damage, MISS_SHIELDS, NO_SPARKS);
 251                                 }
 252                         }
 253
 254                         // maybe print Collision on HUD
 255                         if ( pship == Player_obj ) {
 256                                 hud_start_text_flash(XSTR("Collision", 1431), 2000);
 257                         }
 258
 259                         collide_ship_ship_do_sound(&hitpos, pship, pdebris, pship==Player_obj);
 260
 261                         return 0;
 262                 }
 263         } else {        //      Bounding spheres don't intersect, set timestamp for next collision check.
 264                 float   ship_max_speed, debris_speed;
 265                 float   time;
 266                 ship *shipp;
 267
 268                 shipp = &Ships[pship->instance];
 269
 270                 if (ship_is_beginning_warpout_speedup(pship)) {
 271                         ship_max_speed = max(ship_get_max_speed(shipp), ship_get_warp_speed(pship));
 272                 } else {
 273                         ship_max_speed = ship_get_max_speed(shipp);
 274                 }
 275                 ship_max_speed = max(ship_max_speed, 10.0f);
 276                 ship_max_speed = max(ship_max_speed, pship->phys_info.vel.z);
 277
 278                 debris_speed = pdebris->phys_info.speed;
 279
 280                 time = 1000.0f * (dist - pship->radius - pdebris->radius - 10.0f) / (ship_max_speed + debris_speed);            // 10.0f is a safety factor
 281                 time -= 200.0f;         // allow one frame slow frame at ~5 fps
 282
 283                 if (time > 100) {
 284                         //nprintf(("AI", "Ship %s debris #%i delay time = %.1f seconds\n", Ships[pship->instance].ship_name, pdebris-Objects, time/1000.0f));
 285                         pair->next_check_time = timestamp( fl2i(time) );
 286                 } else {
 287                         pair->next_check_time = timestamp(0);   // check next time
 288                 }
 289         }
 290
 291         return 0;
 292 }
 293
 294 // Checks asteroid-ship collisions.  pair->a is asteroid and pair->b is ship.
 295 // Returns 1 if all future collisions between these can be ignored
 296 int collide_asteroid_ship( obj_pair * pair )
 297 {
 298 #ifndef FS2_DEMO
 299
 300         if (!Asteroids_enabled)
 301                 return 0;
 302
 303         float           dist;
 304         object  *pasteroid = pair->a;
 305         object  *pship = pair->b;
 306
 307                 // Don't check collisions for warping out player
 308         if ( Player->control_mode != PCM_NORMAL )       {
 309                 if ( pship == Player_obj ) return 0;
 310         }
 311
 312         if (pasteroid->hull_strength < 0.0f)
 313                 return 0;
 314
 315         Assert( pasteroid->type == OBJ_ASTEROID );
 316         Assert( pship->type == OBJ_SHIP );
 317
 318         dist = vm_vec_dist( &pasteroid->pos, &pship->pos );
 319
 320         if ( dist < pasteroid->radius + pship->radius ) {
 321                 int hit;
 322                 vector  hitpos;
 323                 // create and initialize ship_ship_hit_info struct
 324                 collision_info_struct asteroid_hit_info;
 325                 memset( &asteroid_hit_info, -1, sizeof(collision_info_struct) );
 326
 327                 if ( pasteroid->phys_info.mass > pship->phys_info.mass ) {
 328                         asteroid_hit_info.heavy = pasteroid;
 329                         asteroid_hit_info.light = pship;
 330                 } else {
 331                         asteroid_hit_info.heavy = pship;
 332                         asteroid_hit_info.light = pasteroid;
 333                 }
 334
 335                 hit = asteroid_check_collision(pasteroid, pship, &hitpos, &asteroid_hit_info );
 336                 if ( hit ) {
 337                         float           ship_damage;
 338                         float           asteroid_damage;
 339
 340                         vector asteroid_vel = pasteroid->phys_info.vel;
 341
 342                         // do collision physics
 343                         calculate_ship_ship_collision_physics( &asteroid_hit_info );
 344
 345                         if ( asteroid_hit_info.impulse < 0.5f )
 346                                 return 0;
 347
 348                         // limit damage from impulse by making max impulse (for damage) 2*m*v_max_relative
 349                         float max_ship_impulse = (2.0f*pship->phys_info.max_vel.z+vm_vec_mag_quick(&asteroid_vel)) *
 350                                 (pship->phys_info.mass*pasteroid->phys_info.mass) / (pship->phys_info.mass + pasteroid->phys_info.mass);
 351
 352                         if (asteroid_hit_info.impulse > max_ship_impulse) {
 353                                 ship_damage = 0.001f * max_ship_impulse;
 354                         } else {
 355                                 ship_damage = 0.001f * asteroid_hit_info.impulse;       //      Cut collision-based damage in half.
 356                         }
 357
 358                         //      Decrease heavy damage by 2x.
 359                         if (ship_damage > 5.0f)
 360                                 ship_damage = 5.0f + (ship_damage - 5.0f)/2.0f;
 361
 362                         if ((ship_damage > 500.0f) && (ship_damage > Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength/8.0f)) {
 363                                 ship_damage = Ship_info[Ships[pship->instance].ship_info_index].initial_hull_strength/8.0f;
 364                                 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));
 365                         }
 366
 367                         //      Decrease damage during warp out because it's damn annoying when your escoree dies during warp out.
 368                         if (Ai_info[Ships[pship->instance].ai_index].mode == AIM_WARP_OUT)
 369                                 ship_damage /= 3.0f;
 370
 371                         //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));
 372
 373                         // calculate asteroid damage and set asteroid damage to greater or asteroid and ship
 374                         // asteroid damage is needed since we can really whack some small asteroid with afterburner and not do
 375                         // significant damage to ship but the asteroid goes off faster than afterburner speed.
 376                         asteroid_damage = asteroid_hit_info.impulse/pasteroid->phys_info.mass;  // ie, delta velocity of asteroid
 377                         asteroid_damage = (asteroid_damage > ship_damage) ? asteroid_damage : ship_damage;
 378
 379                         // apply damage to asteroid
 380                         asteroid_hit( pasteroid, pship, &hitpos, asteroid_damage);              // speed => damage
 381
 382                         //extern fix Missiontime;
 383
 384                         int quadrant_num;
 385                         if ( asteroid_hit_info.heavy == pship ) {
 386                                 quadrant_num = get_ship_quadrant_from_global(&hitpos, pship);
 387                                 if ((pship->flags & OF_NO_SHIELDS) || !ship_is_shield_up(pship, quadrant_num) ) {
 388                                         quadrant_num = -1;
 389                                 }
 390                                 ship_apply_local_damage(asteroid_hit_info.heavy, asteroid_hit_info.light, &hitpos, ship_damage, quadrant_num, CREATE_SPARKS, asteroid_hit_info.submodel_num);
 391                                 //if (asteroid_hit_info.heavy->type == OBJ_SHIP) {
 392                                 //      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));
 393                                 //}
 394                         } else {
 395                                 // dont draw sparks (using sphere hitpos)
 396                                 ship_apply_local_damage(asteroid_hit_info.light, asteroid_hit_info.heavy, &hitpos, ship_damage, MISS_SHIELDS, NO_SPARKS);
 397                                 //if (asteroid_hit_info.light->type == OBJ_SHIP) {
 398                                 //      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));
 399                                 //}
 400                         }
 401
 402                         // maybe print Collision on HUD
 403                         if ( pship == Player_obj ) {
 404                                 hud_start_text_flash(XSTR("Collision", 1431), 2000);
 405                         }
 406
 407                         collide_ship_ship_do_sound(&hitpos, pship, pasteroid, pship==Player_obj);
 408
 409                         return 0;
 410                 }
 411
 412                 return 0;
 413         } else {
 414                 // estimate earliest time at which pair can hit
 415                 float asteroid_max_speed, ship_max_speed, time;
 416                 ship *shipp = &Ships[pship->instance];
 417
 418                 asteroid_max_speed = vm_vec_mag(&pasteroid->phys_info.vel);             // Asteroid... vel gets reset, not max vel.z
 419                 asteroid_max_speed = max(asteroid_max_speed, 10.0f);
 420
 421                 if (ship_is_beginning_warpout_speedup(pship)) {
 422                         ship_max_speed = max(ship_get_max_speed(shipp), ship_get_warp_speed(pship));
 423                 } else {
 424                         ship_max_speed = ship_get_max_speed(shipp);
 425                 }
 426                 ship_max_speed = max(ship_max_speed, 10.0f);
 427                 ship_max_speed = max(ship_max_speed, pship->phys_info.vel.z);
 428
 429
 430                 time = 1000.0f * (dist - pship->radius - pasteroid->radius - 10.0f) / (asteroid_max_speed + ship_max_speed);            // 10.0f is a safety factor
 431                 time -= 200.0f;         // allow one frame slow frame at ~5 fps
 432
 433                 if (time > 100) {
 434                         pair->next_check_time = timestamp( fl2i(time) );
 435                 } else {
 436                         pair->next_check_time = timestamp(0);   // check next time
 437                 }
 438                 return 0;
 439         }
 440 #else
 441         return 0;       // no asteroids in demo version
 442 #endif
 443 }