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