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