main/ai.c

   1 /* $Id: ai.c,v 1.9 2004-12-01 12:48:13 btb Exp $ */
   2 /*
   3 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   4 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   5 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   6 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   7 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   8 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   9 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
  10 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  11 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  12 COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  13 */
  14
  15 /*
  16  *
  17  * Autonomous Individual movement.
  18  *
  19  */
  20
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <conf.h>
  24 #endif
  25
  26 char ai_rcsid[] = "$Id: ai.c,v 1.9 2004-12-01 12:48:13 btb Exp $";
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <time.h>
  31
  32 #include "inferno.h"
  33 #include "game.h"
  34 #include "mono.h"
  35 #include "3d.h"
  36
  37 #include "object.h"
  38 #include "render.h"
  39 #include "error.h"
  40 #include "ai.h"
  41 #include "laser.h"
  42 #include "fvi.h"
  43 #include "polyobj.h"
  44 #include "bm.h"
  45 #include "weapon.h"
  46 #include "physics.h"
  47 #include "collide.h"
  48 #include "player.h"
  49 #include "wall.h"
  50 #include "vclip.h"
  51 #include "fireball.h"
  52 #include "morph.h"
  53 #include "effects.h"
  54 #include "timer.h"
  55 #include "sounds.h"
  56 #include "cntrlcen.h"
  57 #include "multibot.h"
  58 #ifdef NETWORK
  59 #include "multi.h"
  60 #include "network.h"
  61 #endif
  62 #include "gameseq.h"
  63 #include "key.h"
  64 #include "powerup.h"
  65 #include "gauges.h"
  66 #include "text.h"
  67 #include "fuelcen.h"
  68 #include "controls.h"
  69 #include "kconfig.h"
  70
  71 #ifdef EDITOR
  72 #include "editor/editor.h"
  73 #endif
  74
  75 #include "string.h"
  76
  77 #ifndef NDEBUG
  78 #include <time.h>
  79 #endif
  80
  81 // ---------- John: These variables must be saved as part of gamesave. --------
  82 int             Ai_initialized = 0;
  83 int             Overall_agitation;
  84 ai_local        Ai_local_info[MAX_OBJECTS];
  85 point_seg       Point_segs[MAX_POINT_SEGS];
  86 point_seg       *Point_segs_free_ptr = Point_segs;
  87 ai_cloak_info   Ai_cloak_info[MAX_AI_CLOAK_INFO];
  88 fix             Boss_cloak_start_time = 0;
  89 fix             Boss_cloak_end_time = 0;
  90 fix             Last_teleport_time = 0;
  91 fix             Boss_teleport_interval = F1_0*8;
  92 fix             Boss_cloak_interval = F1_0*10;                    //    Time between cloaks
  93 fix             Boss_cloak_duration = BOSS_CLOAK_DURATION;
  94 fix             Last_gate_time = 0;
  95 fix             Gate_interval = F1_0*6;
  96 fix             Boss_dying_start_time;
  97 fix             Boss_hit_time;
  98 sbyte           Boss_dying, Boss_dying_sound_playing, unused123, unused234;
  99
 100 // -- MK, 10/21/95, unused! -- int             Boss_been_hit=0;
 101
 102
 103 // ------ John: End of variables which must be saved as part of gamesave. -----
 104
 105
 106 // -- ubyte Boss_cloaks[NUM_D2_BOSSES]              = {1,1,1,1,1,1};      // Set byte if this boss can cloak
 107
 108 ubyte Boss_teleports[NUM_D2_BOSSES]           = {1,1,1,1,1,1, 1,1}; // Set byte if this boss can teleport
 109 ubyte Boss_spew_more[NUM_D2_BOSSES]           = {0,1,0,0,0,0, 0,0}; // If set, 50% of time, spew two bots.
 110 ubyte Boss_spews_bots_energy[NUM_D2_BOSSES]   = {1,1,0,1,0,1, 1,1}; // Set byte if boss spews bots when hit by energy weapon.
 111 ubyte Boss_spews_bots_matter[NUM_D2_BOSSES]   = {0,0,1,1,1,1, 0,1}; // Set byte if boss spews bots when hit by matter weapon.
 112 ubyte Boss_invulnerable_energy[NUM_D2_BOSSES] = {0,0,1,1,0,0, 0,0}; // Set byte if boss is invulnerable to energy weapons.
 113 ubyte Boss_invulnerable_matter[NUM_D2_BOSSES] = {0,0,0,0,1,1, 1,0}; // Set byte if boss is invulnerable to matter weapons.
 114 ubyte Boss_invulnerable_spot[NUM_D2_BOSSES]   = {0,0,0,0,0,1, 0,1}; // Set byte if boss is invulnerable in all but a certain spot.  (Dot product fvec|vec_to_collision < BOSS_INVULNERABLE_DOT)
 115
 116 int ai_evaded=0;
 117
 118 // -- sbyte Super_boss_gate_list[MAX_GATE_INDEX] = {0, 1, 8, 9, 10, 11, 12, 15, 16, 18, 19, 20, 22, 0, 8, 11, 19, 20, 8, 20, 8};
 119
 120 int Robot_firing_enabled = 1;
 121 int Animation_enabled = 1;
 122
 123 #ifndef NDEBUG
 124 int Ai_info_enabled=0;
 125 #endif
 126
 127
 128 // These globals are set by a call to find_vector_intersection, which is a slow routine,
 129 // so we don't want to call it again (for this object) unless we have to.
 130 vms_vector  Hit_pos;
 131 int         Hit_type, Hit_seg;
 132 fvi_info    Hit_data;
 133
 134 int             Num_awareness_events = 0;
 135 awareness_event Awareness_events[MAX_AWARENESS_EVENTS];
 136
 137 vms_vector      Believed_player_pos;
 138 int             Believed_player_seg;
 139
 140 #ifndef NDEBUG
 141 // Index into this array with ailp->mode
 142 char *mode_text[18] = {
 143         "STILL",
 144         "WANDER",
 145         "FOL_PATH",
 146         "CHASE_OBJ",
 147         "RUN_FROM",
 148         "BEHIND",
 149         "FOL_PATH2",
 150         "OPEN_DOOR",
 151         "GOTO_PLR",
 152         "GOTO_OBJ",
 153         "SN_ATT",
 154         "SN_FIRE",
 155         "SN_RETR",
 156         "SN_RTBK",
 157         "SN_WAIT",
 158         "TH_ATTACK",
 159         "TH_RETREAT",
 160         "TH_WAIT",
 161 };
 162
 163 //      Index into this array with aip->behavior
 164 char behavior_text[6][9] = {
 165         "STILL   ",
 166         "NORMAL  ",
 167         "HIDE    ",
 168         "RUN_FROM",
 169         "FOLPATH ",
 170         "STATION "
 171 };
 172
 173 // Index into this array with aip->GOAL_STATE or aip->CURRENT_STATE
 174 char state_text[8][5] = {
 175         "NONE",
 176         "REST",
 177         "SRCH",
 178         "LOCK",
 179         "FLIN",
 180         "FIRE",
 181         "RECO",
 182         "ERR_",
 183 };
 184
 185
 186 #endif
 187
 188 // Current state indicates where the robot current is, or has just done.
 189 // Transition table between states for an AI object.
 190 // First dimension is trigger event.
 191 // Second dimension is current state.
 192 // Third dimension is goal state.
 193 // Result is new goal state.
 194 // ERR_ means something impossible has happened.
 195 sbyte Ai_transition_table[AI_MAX_EVENT][AI_MAX_STATE][AI_MAX_STATE] = {
 196         {
 197                 // Event = AIE_FIRE, a nearby object fired
 198                 // none     rest      srch      lock      flin      fire      reco        // CURRENT is rows, GOAL is columns
 199                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO }, // none
 200                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO }, // rest
 201                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO }, // search
 202                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO }, // lock
 203                 { AIS_ERR_, AIS_REST, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FIRE, AIS_RECO }, // flinch
 204                 { AIS_ERR_, AIS_FIRE, AIS_FIRE, AIS_FIRE, AIS_FLIN, AIS_FIRE, AIS_RECO }, // fire
 205                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_FIRE }  // recoil
 206         },
 207
 208         // Event = AIE_HITT, a nearby object was hit (or a wall was hit)
 209         {
 210                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 211                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 212                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 213                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 214                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FLIN},
 215                 { AIS_ERR_, AIS_REST, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FIRE, AIS_RECO},
 216                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_FIRE}
 217         },
 218
 219         // Event = AIE_COLL, player collided with robot
 220         {
 221                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 222                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 223                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 224                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_RECO},
 225                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_LOCK, AIS_FLIN, AIS_FLIN},
 226                 { AIS_ERR_, AIS_REST, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FIRE, AIS_RECO},
 227                 { AIS_ERR_, AIS_LOCK, AIS_LOCK, AIS_LOCK, AIS_FLIN, AIS_FIRE, AIS_FIRE}
 228         },
 229
 230         // Event = AIE_HURT, player hurt robot (by firing at and hitting it)
 231         // Note, this doesn't necessarily mean the robot JUST got hit, only that that is the most recent thing that happened.
 232         {
 233                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN},
 234                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN},
 235                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN},
 236                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN},
 237                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN},
 238                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN},
 239                 { AIS_ERR_, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN, AIS_FLIN}
 240         }
 241 };
 242
 243
 244
 245 fix Dist_to_last_fired_upon_player_pos = 0;
 246
 247 // ----------------------------------------------------------------------------
 248 void init_ai_frame(void)
 249 {
 250         int ab_state;
 251
 252         Dist_to_last_fired_upon_player_pos = vm_vec_dist_quick(&Last_fired_upon_player_pos, &Believed_player_pos);
 253
 254         ab_state = Afterburner_charge && Controls.afterburner_state && (Players[Player_num].flags & PLAYER_FLAGS_AFTERBURNER);
 255
 256         if (!(Players[Player_num].flags & PLAYER_FLAGS_CLOAKED) || (Players[Player_num].flags & PLAYER_FLAGS_HEADLIGHT_ON) || ab_state) {
 257                 ai_do_cloak_stuff();
 258         }
 259 }
 260
 261 // ----------------------------------------------------------------------------
 262 // Return firing status.
 263 // If ready to fire a weapon, return true, else return false.
 264 // Ready to fire a weapon if next_fire <= 0 or next_fire2 <= 0.
 265 int ready_to_fire(robot_info *robptr, ai_local *ailp)
 266 {
 267         if (robptr->weapon_type2 != -1)
 268                 return (ailp->next_fire <= 0) || (ailp->next_fire2 <= 0);
 269         else
 270                 return (ailp->next_fire <= 0);
 271 }
 272
 273 // ----------------------------------------------------------------------------
 274 // Make a robot near the player snipe.
 275 #define MNRS_SEG_MAX    70
 276 void make_nearby_robot_snipe(void)
 277 {
 278         int bfs_length, i;
 279         short bfs_list[MNRS_SEG_MAX];
 280
 281         create_bfs_list(ConsoleObject->segnum, bfs_list, &bfs_length, MNRS_SEG_MAX);
 282
 283         for (i=0; i<bfs_length; i++) {
 284                 int objnum = Segments[bfs_list[i]].objects;
 285
 286                 while (objnum != -1) {
 287                         object *objp = &Objects[objnum];
 288                         robot_info *robptr = &Robot_info[objp->id];
 289
 290                         if ((objp->type == OBJ_ROBOT) && (objp->id != ROBOT_BRAIN)) {
 291                                 if ((objp->ctype.ai_info.behavior != AIB_SNIPE) && (objp->ctype.ai_info.behavior != AIB_RUN_FROM) && !Robot_info[objp->id].boss_flag && !robptr->companion) {
 292                                         objp->ctype.ai_info.behavior = AIB_SNIPE;
 293                                         Ai_local_info[objnum].mode = AIM_SNIPE_ATTACK;
 294                                         mprintf((0, "Making robot #%i go into snipe mode!\n", objnum));
 295                                         return;
 296                                 }
 297                         }
 298                         objnum = objp->next;
 299                 }
 300         }
 301
 302         mprintf((0, "Couldn't find a robot to make snipe!\n"));
 303
 304 }
 305
 306 int Ai_last_missile_camera;
 307
 308 int Robots_kill_robots_cheat = 0;
 309
 310 // --------------------------------------------------------------------------------------------------------------------
 311 void do_ai_frame(object *obj)
 312 {
 313         int         objnum = obj-Objects;
 314         ai_static   *aip = &obj->ctype.ai_info;
 315         ai_local    *ailp = &Ai_local_info[objnum];
 316         fix         dist_to_player;
 317         vms_vector  vec_to_player;
 318         fix         dot;
 319         robot_info  *robptr;
 320         int         player_visibility=-1;
 321         int         obj_ref;
 322         int         object_animates;
 323         int         new_goal_state;
 324         int         visibility_and_vec_computed = 0;
 325         int         previous_visibility;
 326         vms_vector  gun_point;
 327         vms_vector  vis_vec_pos;
 328
 329         ailp->next_action_time -= FrameTime;
 330
 331         if (aip->SKIP_AI_COUNT) {
 332                 aip->SKIP_AI_COUNT--;
 333                 if (obj->mtype.phys_info.flags & PF_USES_THRUST) {
 334                         obj->mtype.phys_info.rotthrust.x = (obj->mtype.phys_info.rotthrust.x * 15)/16;
 335                         obj->mtype.phys_info.rotthrust.y = (obj->mtype.phys_info.rotthrust.y * 15)/16;
 336                         obj->mtype.phys_info.rotthrust.z = (obj->mtype.phys_info.rotthrust.z * 15)/16;
 337                         if (!aip->SKIP_AI_COUNT)
 338                                 obj->mtype.phys_info.flags &= ~PF_USES_THRUST;
 339                 }
 340                 return;
 341         }
 342
 343         robptr = &Robot_info[obj->id];
 344         Assert(robptr->always_0xabcd == 0xabcd);
 345
 346         if (do_any_robot_dying_frame(obj))
 347                 return;
 348
 349         // Kind of a hack.  If a robot is flinching, but it is time for it to fire, unflinch it.
 350         // Else, you can turn a big nasty robot into a wimp by firing flares at it.
 351         // This also allows the player to see the cool flinch effect for mechs without unbalancing the game.
 352         if ((aip->GOAL_STATE == AIS_FLIN) && ready_to_fire(robptr, ailp)) {
 353                 aip->GOAL_STATE = AIS_FIRE;
 354         }
 355
 356 #ifndef NDEBUG
 357         if ((aip->behavior == AIB_RUN_FROM) && (ailp->mode != AIM_RUN_FROM_OBJECT))
 358                 Int3(); // This is peculiar.  Behavior is run from, but mode is not.  Contact Mike.
 359
 360         mprintf_animation_info((obj));
 361
 362         if (!Do_ai_flag)
 363                 return;
 364
 365         if (Break_on_object != -1)
 366                 if ((obj-Objects) == Break_on_object)
 367                         Int3(); // Contact Mike: This is a debug break
 368 #endif
 369
 370         //mprintf((0, "Object %i: behavior = %02x, mode = %i, awareness = %i, time = %7.3f\n", obj-Objects, aip->behavior, ailp->mode, ailp->player_awareness_type, f2fl(ailp->player_awareness_time)));
 371         //mprintf((0, "Object %i: behavior = %02x, mode = %i, awareness = %i, cur=%i, goal=%i\n", obj-Objects, aip->behavior, ailp->mode, ailp->player_awareness_type, aip->CURRENT_STATE, aip->GOAL_STATE));
 372
 373         //Assert((aip->behavior >= MIN_BEHAVIOR) && (aip->behavior <= MAX_BEHAVIOR));
 374         if (!((aip->behavior >= MIN_BEHAVIOR) && (aip->behavior <= MAX_BEHAVIOR))) {
 375                 //mprintf((0, "Object %i behavior is %i, setting to AIB_NORMAL, fix in editor!\n", objnum, aip->behavior));
 376                 aip->behavior = AIB_NORMAL;
 377         }
 378
 379         Assert(obj->segnum != -1);
 380         Assert(obj->id < N_robot_types);
 381
 382         obj_ref = objnum ^ FrameCount;
 383
 384         if (ailp->next_fire > -F1_0*8)
 385                 ailp->next_fire -= FrameTime;
 386
 387         if (robptr->weapon_type2 != -1) {
 388                 if (ailp->next_fire2 > -F1_0*8)
 389                         ailp->next_fire2 -= FrameTime;
 390         } else
 391                 ailp->next_fire2 = F1_0*8;
 392
 393         if (ailp->time_since_processed < F1_0*256)
 394                 ailp->time_since_processed += FrameTime;
 395
 396         previous_visibility = ailp->previous_visibility;    //  Must get this before we toast the master copy!
 397
 398         // -- (No robots have this behavior...)
 399         // -- // Deal with cloaking for robots which are cloaked except just before firing.
 400         // -- if (robptr->cloak_type == RI_CLOAKED_EXCEPT_FIRING)
 401         // --   if (ailp->next_fire < F1_0/2)
 402         // --           aip->CLOAKED = 1;
 403         // --   else
 404         // --           aip->CLOAKED = 0;
 405
 406         // If only awake because of a camera, make that the believed player position.
 407         if ((aip->SUB_FLAGS & SUB_FLAGS_CAMERA_AWAKE) && (Ai_last_missile_camera != -1))
 408                 Believed_player_pos = Objects[Ai_last_missile_camera].pos;
 409         else {
 410                 if (Robots_kill_robots_cheat) {
 411                         vis_vec_pos = obj->pos;
 412                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 413                         if (player_visibility) {
 414                                 int ii, min_obj = -1;
 415                                 fix min_dist = F1_0*200, cur_dist;
 416
 417                                 for (ii=0; ii<=Highest_object_index; ii++)
 418                                         if ((Objects[ii].type == OBJ_ROBOT) && (ii != objnum)) {
 419                                                 cur_dist = vm_vec_dist_quick(&obj->pos, &Objects[ii].pos);
 420
 421                                                 if (cur_dist < F1_0*100)
 422                                                         if (object_to_object_visibility(obj, &Objects[ii], FQ_TRANSWALL))
 423                                                                 if (cur_dist < min_dist) {
 424                                                                         min_obj = ii;
 425                                                                         min_dist = cur_dist;
 426                                                                 }
 427                                         }
 428                                 if (min_obj != -1) {
 429                                         Believed_player_pos = Objects[min_obj].pos;
 430                                         Believed_player_seg = Objects[min_obj].segnum;
 431                                         vm_vec_normalized_dir_quick(&vec_to_player, &Believed_player_pos, &obj->pos);
 432                                 } else
 433                                         goto _exit_cheat;
 434                         } else
 435                                 goto _exit_cheat;
 436                 } else {
 437 _exit_cheat:
 438                         visibility_and_vec_computed = 0;
 439                         if (!(Players[Player_num].flags & PLAYER_FLAGS_CLOAKED))
 440                                 Believed_player_pos = ConsoleObject->pos;
 441                         else
 442                                 Believed_player_pos = Ai_cloak_info[objnum & (MAX_AI_CLOAK_INFO-1)].last_position;
 443                 }
 444         }
 445         dist_to_player = vm_vec_dist_quick(&Believed_player_pos, &obj->pos);
 446         //if (robptr->companion)
 447         //      mprintf((0, "%3i: %3i %8.3f %8s %8s [%3i %4i]\n", objnum, obj->segnum, f2fl(dist_to_player), mode_text[ailp->mode], behavior_text[aip->behavior-0x80], aip->hide_index, aip->path_length));
 448
 449         // If this robot can fire, compute visibility from gun position.
 450         // Don't want to compute visibility twice, as it is expensive.  (So is call to calc_gun_point).
 451         if ((previous_visibility || !(obj_ref & 3)) && ready_to_fire(robptr, ailp) && (dist_to_player < F1_0*200) && (robptr->n_guns) && !(robptr->attack_type)) {
 452                 // Since we passed ready_to_fire(), either next_fire or next_fire2 <= 0.  calc_gun_point from relevant one.
 453                 // If both are <= 0, we will deal with the mess in ai_do_actual_firing_stuff
 454                 if (ailp->next_fire <= 0)
 455                         calc_gun_point(&gun_point, obj, aip->CURRENT_GUN);
 456                 else
 457                         calc_gun_point(&gun_point, obj, 0);
 458                 vis_vec_pos = gun_point;
 459         } else {
 460                 vis_vec_pos = obj->pos;
 461                 vm_vec_zero(&gun_point);
 462                 //mprintf((0, "Visibility = %i, computed from center.\n", player_visibility));
 463         }
 464
 465 // MK: Debugging, July 26, 1995!
 466 // if (objnum == 1)
 467 // {
 468 //      compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 469 //      mprintf((0, "Frame %i: dist=%7.3f, vecdot = %7.3f, mode=%i\n", FrameCount, f2fl(dist_to_player), f2fl(vm_vec_dot(&vec_to_player, &obj->orient.fvec)), ailp->mode));
 470 // }
 471         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 472         // Occasionally make non-still robots make a path to the player.  Based on agitation and distance from player.
 473         if ((aip->behavior != AIB_SNIPE) && (aip->behavior != AIB_RUN_FROM) && (aip->behavior != AIB_STILL) && !(Game_mode & GM_MULTI) && (robptr->companion != 1) && (robptr->thief != 1))
 474                 if (Overall_agitation > 70) {
 475                         if ((dist_to_player < F1_0*200) && (d_rand() < FrameTime/4)) {
 476                                 if (d_rand() * (Overall_agitation - 40) > F1_0*5) {
 477                                         // -- mprintf((0, "(1) Object #%i going from still to path in frame %i.\n", objnum, FrameCount));
 478                                         create_path_to_player(obj, 4 + Overall_agitation/8 + Difficulty_level, 1);
 479                                         return;
 480                                 }
 481                         }
 482                 }
 483
 484         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 485         // If retry count not 0, then add it into consecutive_retries.
 486         // If it is 0, cut down consecutive_retries.
 487         // This is largely a hack to speed up physics and deal with stupid
 488         // AI.  This is low level communication between systems of a sort
 489         // that should not be done.
 490         if ((ailp->retry_count) && !(Game_mode & GM_MULTI)) {
 491                 ailp->consecutive_retries += ailp->retry_count;
 492                 ailp->retry_count = 0;
 493                 if (ailp->consecutive_retries > 3) {
 494                         switch (ailp->mode) {
 495                                 case AIM_GOTO_PLAYER:
 496                                         // -- mprintf((0, "Buddy stuck going to player...\n"));
 497                                         // -- Buddy_got_stuck = 1;
 498                                         move_towards_segment_center(obj);
 499                                         create_path_to_player(obj, 100, 1);
 500                                         // -- Buddy_got_stuck = 0;
 501                                         break;
 502                                 case AIM_GOTO_OBJECT:
 503                                         // -- mprintf((0, "Buddy stuck going to object...\n"));
 504                                         Escort_goal_object = ESCORT_GOAL_UNSPECIFIED;
 505                                         //if (obj->segnum == ConsoleObject->segnum) {
 506                                         //      if (Point_segs[aip->hide_index + aip->cur_path_index].segnum == obj->segnum)
 507                                         //              if ((aip->cur_path_index + aip->PATH_DIR >= 0) && (aip->cur_path_index + aip->PATH_DIR < aip->path_length-1))
 508                                         //                      aip->cur_path_index += aip->PATH_DIR;
 509                                         //}
 510                                         break;
 511                                 case AIM_CHASE_OBJECT:
 512                                         // -- mprintf((0, "(2) Object #%i, retries while chasing, creating path to player in frame %i\n", objnum, FrameCount));
 513                                         create_path_to_player(obj, 4 + Overall_agitation/8 + Difficulty_level, 1);
 514                                         break;
 515                                 case AIM_STILL:
 516                                         if (robptr->attack_type)
 517                                                 move_towards_segment_center(obj);
 518                                         else if (!((aip->behavior == AIB_STILL) || (aip->behavior == AIB_STATION) || (aip->behavior == AIB_FOLLOW)))    // Behavior is still, so don't follow path.
 519                                                 attempt_to_resume_path(obj);
 520                                         break;
 521                                 case AIM_FOLLOW_PATH:
 522                                         // mprintf((0, "Object %i following path got %i retries in frame %i\n", obj-Objects, ailp->consecutive_retries, FrameCount));
 523                                         if (Game_mode & GM_MULTI) {
 524                                                 ailp->mode = AIM_STILL;
 525                                         } else
 526                                                 attempt_to_resume_path(obj);
 527                                         break;
 528                                 case AIM_RUN_FROM_OBJECT:
 529                                         move_towards_segment_center(obj);
 530                                         obj->mtype.phys_info.velocity.x = 0;
 531                                         obj->mtype.phys_info.velocity.y = 0;
 532                                         obj->mtype.phys_info.velocity.z = 0;
 533                                         create_n_segment_path(obj, 5, -1);
 534                                         ailp->mode = AIM_RUN_FROM_OBJECT;
 535                                         break;
 536                                 case AIM_BEHIND:
 537                                         mprintf((0, "Hiding robot (%i) collided much.\n", obj-Objects));
 538                                         move_towards_segment_center(obj);
 539                                         obj->mtype.phys_info.velocity.x = 0;
 540                                         obj->mtype.phys_info.velocity.y = 0;
 541                                         obj->mtype.phys_info.velocity.z = 0;
 542                                         break;
 543                                 case AIM_OPEN_DOOR:
 544                                         create_n_segment_path_to_door(obj, 5, -1);
 545                                         break;
 546                                 #ifndef NDEBUG
 547                                 case AIM_FOLLOW_PATH_2:
 548                                         Int3(); // Should never happen!
 549                                         break;
 550                                 #endif
 551                         }
 552                         ailp->consecutive_retries = 0;
 553                 }
 554         } else
 555                 ailp->consecutive_retries /= 2;
 556
 557         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 558         // If in materialization center, exit
 559         if (!(Game_mode & GM_MULTI) && (Segment2s[obj->segnum].special == SEGMENT_IS_ROBOTMAKER)) {
 560                 if (Station[Segment2s[obj->segnum].value].Enabled) {
 561                         ai_follow_path(obj, 1, 1, NULL);    // 1 = player is visible, which might be a lie, but it works.
 562                         return;
 563                 }
 564         }
 565
 566         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 567         // Decrease player awareness due to the passage of time.
 568         if (ailp->player_awareness_type) {
 569                 if (ailp->player_awareness_time > 0) {
 570                         ailp->player_awareness_time -= FrameTime;
 571                         if (ailp->player_awareness_time <= 0) {
 572                                 ailp->player_awareness_time = F1_0*2;   //new: 11/05/94
 573                                 ailp->player_awareness_type--;          //new: 11/05/94
 574                         }
 575                 } else {
 576                         ailp->player_awareness_type--;
 577                         ailp->player_awareness_time = F1_0*2;
 578                         //aip->GOAL_STATE = AIS_REST;
 579                 }
 580         } else
 581                 aip->GOAL_STATE = AIS_REST;                     //new: 12/13/94
 582
 583
 584         if (Player_is_dead && (ailp->player_awareness_type == 0))
 585                 if ((dist_to_player < F1_0*200) && (d_rand() < FrameTime/8)) {
 586                         if ((aip->behavior != AIB_STILL) && (aip->behavior != AIB_RUN_FROM)) {
 587                                 if (!ai_multiplayer_awareness(obj, 30))
 588                                         return;
 589                                 #ifndef SHAREWARE
 590                                 ai_multi_send_robot_position(objnum, -1);
 591                                 #endif
 592
 593                                 if (!((ailp->mode == AIM_FOLLOW_PATH) && (aip->cur_path_index < aip->path_length-1)))
 594                                         if ((aip->behavior != AIB_SNIPE) && (aip->behavior != AIB_RUN_FROM)) {
 595                                                 if (dist_to_player < F1_0*30)
 596                                                         create_n_segment_path(obj, 5, 1);
 597                                                 else
 598                                                         create_path_to_player(obj, 20, 1);
 599                                         }
 600                         }
 601                 }
 602
 603         // -- // Make sure that if this guy got hit or bumped, then he's chasing player.
 604         // -- if ((ailp->player_awareness_type == PA_WEAPON_ROBOT_COLLISION) || (ailp->player_awareness_type >= PA_PLAYER_COLLISION)) {
 605         // --   if ((ailp->mode != AIM_BEHIND) && (aip->behavior != AIB_STILL) && (aip->behavior != AIB_SNIPE) && (aip->behavior != AIB_RUN_FROM) && (!robptr->companion) && (!robptr->thief) && (obj->id != ROBOT_BRAIN)) {
 606         // --           ailp->mode = AIM_CHASE_OBJECT;
 607         // --           ailp->player_awareness_type = 0;
 608         // --           ailp->player_awareness_time = 0;
 609         // --   }
 610         // -- }
 611
 612         // Make sure that if this guy got hit or bumped, then he's chasing player.
 613         if ((ailp->player_awareness_type == PA_WEAPON_ROBOT_COLLISION) || (ailp->player_awareness_type >= PA_PLAYER_COLLISION)) {
 614                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 615                 if (player_visibility == 1) // Only increase visibility if unobstructed, else claw guys attack through doors.
 616                         player_visibility = 2;
 617         } else if (((obj_ref&3) == 0) && !previous_visibility && (dist_to_player < F1_0*100)) {
 618                 fix sval, rval;
 619
 620                 rval = d_rand();
 621                 sval = (dist_to_player * (Difficulty_level+1))/64;
 622
 623                 // -- mprintf((0, "Object #%3i: dist = %7.3f, rval = %8x, sval = %8x", obj-Objects, f2fl(dist_to_player), rval, sval));
 624                 if ((fixmul(rval, sval) < FrameTime) || (Players[Player_num].flags & PLAYER_FLAGS_HEADLIGHT_ON)) {
 625                         ailp->player_awareness_type = PA_PLAYER_COLLISION;
 626                         ailp->player_awareness_time = F1_0*3;
 627                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 628                         if (player_visibility == 1) {
 629                                 player_visibility = 2;
 630                                 // -- mprintf((0, "...SWITCH!"));
 631                         }
 632                 }
 633
 634                 // -- mprintf((0, "\n"));
 635         }
 636
 637
 638         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 639         if ((aip->GOAL_STATE == AIS_FLIN) && (aip->CURRENT_STATE == AIS_FLIN))
 640                 aip->GOAL_STATE = AIS_LOCK;
 641
 642         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 643         // Note: Should only do these two function calls for objects which animate
 644         if (Animation_enabled && (dist_to_player < F1_0*100)) { // && !(Game_mode & GM_MULTI)) {
 645                 object_animates = do_silly_animation(obj);
 646                 if (object_animates)
 647                         ai_frame_animation(obj);
 648                 //mprintf((0, "Object %i: goal=%i, current=%i\n", obj-Objects, obj->ctype.ai_info.GOAL_STATE, obj->ctype.ai_info.CURRENT_STATE));
 649         } else {
 650                 // If Object is supposed to animate, but we don't let it animate due to distance, then
 651                 // we must change its state, else it will never update.
 652                 aip->CURRENT_STATE = aip->GOAL_STATE;
 653                 object_animates = 0;        // If we're not doing the animation, then should pretend it doesn't animate.
 654         }
 655
 656         switch (Robot_info[obj->id].boss_flag) {
 657         case 0:
 658                 break;
 659
 660         case 1:
 661         case 2:
 662                 mprintf((1, "Warning: D1 boss detected.  Not supported!\n"));
 663                 break;
 664
 665         default:
 666                 {
 667                         int     pv;
 668                         fix     dtp = dist_to_player/4;
 669
 670                         if (aip->GOAL_STATE == AIS_FLIN)
 671                                 aip->GOAL_STATE = AIS_FIRE;
 672                         if (aip->CURRENT_STATE == AIS_FLIN)
 673                                 aip->CURRENT_STATE = AIS_FIRE;
 674
 675                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 676
 677                         pv = player_visibility;
 678
 679                         // If player cloaked, visibility is screwed up and superboss will gate in robots when not supposed to.
 680                         if (Players[Player_num].flags & PLAYER_FLAGS_CLOAKED) {
 681                                 pv = 0;
 682                                 dtp = vm_vec_dist_quick(&ConsoleObject->pos, &obj->pos)/4;
 683                         }
 684
 685                         do_boss_stuff(obj, pv);
 686                 }
 687                 break;
 688         }
 689
 690         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 691         // Time-slice, don't process all the time, purely an efficiency hack.
 692         // Guys whose behavior is station and are not at their hide segment get processed anyway.
 693         if (!((aip->behavior == AIB_SNIPE) && (ailp->mode != AIM_SNIPE_WAIT)) && !robptr->companion && !robptr->thief && (ailp->player_awareness_type < PA_WEAPON_ROBOT_COLLISION-1)) { // If robot got hit, he gets to attack player always!
 694 #ifndef NDEBUG
 695                 if (Break_on_object != objnum) {    // don't time slice if we're interested in this object.
 696 #endif
 697                         if ((aip->behavior == AIB_STATION) && (ailp->mode == AIM_FOLLOW_PATH) && (aip->hide_segment != obj->segnum)) {
 698                                 if (dist_to_player > F1_0*250)  // station guys not at home always processed until 250 units away.
 699                                         return;
 700                         } else if ((!ailp->previous_visibility) && ((dist_to_player >> 7) > ailp->time_since_processed)) {  // 128 units away (6.4 segments) processed after 1 second.
 701                                 if (robptr->thief)
 702                                         mprintf((0, "T"));
 703                                 return;
 704                         }
 705 #ifndef NDEBUG
 706                 }
 707 #endif
 708         }
 709
 710         // Reset time since processed, but skew objects so not everything
 711         // processed synchronously, else we get fast frames with the
 712         // occasional very slow frame.
 713         // AI_proc_time = ailp->time_since_processed;
 714         ailp->time_since_processed = - ((objnum & 0x03) * FrameTime ) / 2;
 715
 716         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 717         //      Perform special ability
 718         switch (obj->id) {
 719                 case ROBOT_BRAIN:
 720                         // Robots function nicely if behavior is Station.  This
 721                         // means they won't move until they can see the player, at
 722                         // which time they will start wandering about opening doors.
 723                         if (ConsoleObject->segnum == obj->segnum) {
 724                                 if (!ai_multiplayer_awareness(obj, 97))
 725                                         return;
 726                                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 727                                 move_away_from_player(obj, &vec_to_player, 0);
 728                                 ai_multi_send_robot_position(objnum, -1);
 729                         } else if (ailp->mode != AIM_STILL) {
 730                                 int r;
 731
 732                                 r = openable_doors_in_segment(obj->segnum);
 733                                 if (r != -1) {
 734                                         ailp->mode = AIM_OPEN_DOOR;
 735                                         aip->GOALSIDE = r;
 736                                 } else if (ailp->mode != AIM_FOLLOW_PATH) {
 737                                         if (!ai_multiplayer_awareness(obj, 50))
 738                                                 return;
 739                                         create_n_segment_path_to_door(obj, 8+Difficulty_level, -1);     // third parameter is avoid_seg, -1 means avoid nothing.
 740                                         ai_multi_send_robot_position(objnum, -1);
 741                                 }
 742
 743                                 if (ailp->next_action_time < 0) {
 744                                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 745                                         if (player_visibility) {
 746                                                 make_nearby_robot_snipe();
 747                                                 ailp->next_action_time = (NDL - Difficulty_level) * 2*F1_0;
 748                                         }
 749                                 }
 750                         } else {
 751                                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 752                                 if (player_visibility) {
 753                                         if (!ai_multiplayer_awareness(obj, 50))
 754                                                 return;
 755                                         create_n_segment_path_to_door(obj, 8+Difficulty_level, -1);     // third parameter is avoid_seg, -1 means avoid nothing.
 756                                         ai_multi_send_robot_position(objnum, -1);
 757                                 }
 758                         }
 759                         break;
 760                 default:
 761                         break;
 762         }
 763
 764         if (aip->behavior == AIB_SNIPE) {
 765                 if ((Game_mode & GM_MULTI) && !robptr->thief) {
 766                         aip->behavior = AIB_NORMAL;
 767                         ailp->mode = AIM_CHASE_OBJECT;
 768                         return;
 769                 }
 770
 771                 if (!(obj_ref & 3) || previous_visibility) {
 772                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 773
 774                         // If this sniper is in still mode, if he was hit or can see player, switch to snipe mode.
 775                         if (ailp->mode == AIM_STILL)
 776                                 if (player_visibility || (ailp->player_awareness_type == PA_WEAPON_ROBOT_COLLISION))
 777                                         ailp->mode = AIM_SNIPE_ATTACK;
 778
 779                         if (!robptr->thief && (ailp->mode != AIM_STILL))
 780                                 do_snipe_frame(obj, dist_to_player, player_visibility, &vec_to_player);
 781                 } else if (!robptr->thief && !robptr->companion)
 782                         return;
 783         }
 784
 785         // More special ability stuff, but based on a property of a robot, not its ID.
 786         if (robptr->companion) {
 787
 788                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 789                 do_escort_frame(obj, dist_to_player, player_visibility);
 790
 791                 if (obj->ctype.ai_info.danger_laser_num != -1) {
 792                         object *dobjp = &Objects[obj->ctype.ai_info.danger_laser_num];
 793
 794                         if ((dobjp->type == OBJ_WEAPON) && (dobjp->signature == obj->ctype.ai_info.danger_laser_signature)) {
 795                                 fix circle_distance;
 796                                 // -- mprintf((0, "Evading!  "));
 797                                 circle_distance = robptr->circle_distance[Difficulty_level] + ConsoleObject->size;
 798                                 ai_move_relative_to_player(obj, ailp, dist_to_player, &vec_to_player, circle_distance, 1, player_visibility);
 799                         }
 800                 }
 801
 802                 if (ready_to_fire(robptr, ailp)) {
 803                         int do_stuff = 0;
 804                         if (openable_doors_in_segment(obj->segnum) != -1)
 805                                 do_stuff = 1;
 806                         else if (openable_doors_in_segment(Point_segs[aip->hide_index + aip->cur_path_index + aip->PATH_DIR].segnum) != -1)
 807                                 do_stuff = 1;
 808                         else if (openable_doors_in_segment(Point_segs[aip->hide_index + aip->cur_path_index + 2*aip->PATH_DIR].segnum) != -1)
 809                                 do_stuff = 1;
 810                         else if ((ailp->mode == AIM_GOTO_PLAYER) && (dist_to_player < 3*MIN_ESCORT_DISTANCE/2) && (vm_vec_dot(&ConsoleObject->orient.fvec, &vec_to_player) > -F1_0/4)) {
 811                                 // mprintf((0, "Firing at player because dot = %7.3f\n", f2fl(vm_vec_dot(&ConsoleObject->orient.fvec, &vec_to_player))));
 812                                 do_stuff = 1;
 813                         } else
 814                                 ; // mprintf((0, "Not Firing at player because dot = %7.3f, dist = %7.3f\n", f2fl(vm_vec_dot(&ConsoleObject->orient.fvec, &vec_to_player)), f2fl(dist_to_player)));
 815
 816                         if (do_stuff) {
 817                                 Laser_create_new_easy( &obj->orient.fvec, &obj->pos, obj-Objects, FLARE_ID, 1);
 818                                 ailp->next_fire = F1_0/2;
 819                                 if (!Buddy_allowed_to_talk) // If buddy not talking, make him fire flares less often.
 820                                         ailp->next_fire += d_rand()*4;
 821                         }
 822
 823                 }
 824         }
 825
 826         if (robptr->thief) {
 827
 828                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 829                 do_thief_frame(obj, dist_to_player, player_visibility, &vec_to_player);
 830
 831                 if (ready_to_fire(robptr, ailp)) {
 832                         int do_stuff = 0;
 833                         if (openable_doors_in_segment(obj->segnum) != -1)
 834                                 do_stuff = 1;
 835                         else if (openable_doors_in_segment(Point_segs[aip->hide_index + aip->cur_path_index + aip->PATH_DIR].segnum) != -1)
 836                                 do_stuff = 1;
 837                         else if (openable_doors_in_segment(Point_segs[aip->hide_index + aip->cur_path_index + 2*aip->PATH_DIR].segnum) != -1)
 838                                 do_stuff = 1;
 839
 840                         if (do_stuff) {
 841                                 // @mk, 05/08/95: Firing flare from center of object, this is dumb...
 842                                 Laser_create_new_easy( &obj->orient.fvec, &obj->pos, obj-Objects, FLARE_ID, 1);
 843                                 ailp->next_fire = F1_0/2;
 844                                 if (Stolen_item_index == 0)     // If never stolen an item, fire flares less often (bad: Stolen_item_index wraps, but big deal)
 845                                         ailp->next_fire += d_rand()*4;
 846                         }
 847                 }
 848         }
 849
 850         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
 851         switch (ailp->mode) {
 852                 case AIM_CHASE_OBJECT: {        // chasing player, sort of, chase if far, back off if close, circle in between
 853                         fix circle_distance;
 854
 855                         circle_distance = robptr->circle_distance[Difficulty_level] + ConsoleObject->size;
 856                         // Green guy doesn't get his circle distance boosted, else he might never attack.
 857                         if (robptr->attack_type != 1)
 858                                 circle_distance += (objnum&0xf) * F1_0/2;
 859
 860                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 861
 862                         // @mk, 12/27/94, structure here was strange.  Would do both clauses of what are now this if/then/else.  Used to be if/then, if/then.
 863                         if ((player_visibility < 2) && (previous_visibility == 2)) { // this is redundant: mk, 01/15/95: && (ailp->mode == AIM_CHASE_OBJECT)) {
 864                                 // -- mprintf((0, "I used to be able to see the player!\n"));
 865                                 if (!ai_multiplayer_awareness(obj, 53)) {
 866                                         if (maybe_ai_do_actual_firing_stuff(obj, aip))
 867                                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
 868                                         return;
 869                                 }
 870                                 // -- mprintf((0, "(3) Object #%i going from chase to player path in frame %i.\n", objnum, FrameCount));
 871                                 create_path_to_player(obj, 8, 1);
 872                                 ai_multi_send_robot_position(objnum, -1);
 873                         } else if ((player_visibility == 0) && (dist_to_player > F1_0*80) && (!(Game_mode & GM_MULTI))) {
 874                                 // If pretty far from the player, player cannot be seen
 875                                 // (obstructed) and in chase mode, switch to follow path mode.
 876                                 // This has one desirable benefit of avoiding physics retries.
 877                                 if (aip->behavior == AIB_STATION) {
 878                                         ailp->goal_segment = aip->hide_segment;
 879                                         // -- mprintf((0, "(1) Object #%i going from chase to STATION in frame %i.\n", objnum, FrameCount));
 880                                         create_path_to_station(obj, 15);
 881                                 } // -- this looks like a dumb thing to do...robots following paths far away from you! else create_n_segment_path(obj, 5, -1);
 882                                 break;
 883                         }
 884
 885                         if ((aip->CURRENT_STATE == AIS_REST) && (aip->GOAL_STATE == AIS_REST)) {
 886                                 if (player_visibility) {
 887                                         if (d_rand() < FrameTime*player_visibility) {
 888                                                 if (dist_to_player/256 < d_rand()*player_visibility) {
 889                                                         // mprintf((0, "Object %i searching for player.\n", obj-Objects));
 890                                                         aip->GOAL_STATE = AIS_SRCH;
 891                                                         aip->CURRENT_STATE = AIS_SRCH;
 892                                                 }
 893                                         }
 894                                 }
 895                         }
 896
 897                         if (GameTime - ailp->time_player_seen > CHASE_TIME_LENGTH) {
 898
 899                                 if (Game_mode & GM_MULTI)
 900                                         if (!player_visibility && (dist_to_player > F1_0*70)) {
 901                                                 ailp->mode = AIM_STILL;
 902                                                 return;
 903                                         }
 904
 905                                 if (!ai_multiplayer_awareness(obj, 64)) {
 906                                         if (maybe_ai_do_actual_firing_stuff(obj, aip))
 907                                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
 908                                         return;
 909                                 }
 910                                 // -- bad idea, robots charge player they've never seen! -- mprintf((0, "(4) Object #%i going from chase to player path in frame %i.\n", objnum, FrameCount));
 911                                 // -- bad idea, robots charge player they've never seen! -- create_path_to_player(obj, 10, 1);
 912                                 // -- bad idea, robots charge player they've never seen! -- ai_multi_send_robot_position(objnum, -1);
 913                         } else if ((aip->CURRENT_STATE != AIS_REST) && (aip->GOAL_STATE != AIS_REST)) {
 914                                 if (!ai_multiplayer_awareness(obj, 70)) {
 915                                         if (maybe_ai_do_actual_firing_stuff(obj, aip))
 916                                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
 917                                         return;
 918                                 }
 919                                 ai_move_relative_to_player(obj, ailp, dist_to_player, &vec_to_player, circle_distance, 0, player_visibility);
 920
 921                                 if ((obj_ref & 1) && ((aip->GOAL_STATE == AIS_SRCH) || (aip->GOAL_STATE == AIS_LOCK))) {
 922                                         if (player_visibility) // == 2)
 923                                                 ai_turn_towards_vector(&vec_to_player, obj, robptr->turn_time[Difficulty_level]);
 924                                 }
 925
 926                                 if (ai_evaded) {
 927                                         ai_multi_send_robot_position(objnum, 1);
 928                                         ai_evaded = 0;
 929                                 } else
 930                                         ai_multi_send_robot_position(objnum, -1);
 931
 932                                 do_firing_stuff(obj, player_visibility, &vec_to_player);
 933                         }
 934                         break;
 935                 }
 936
 937                 case AIM_RUN_FROM_OBJECT:
 938                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
 939
 940                         if (player_visibility) {
 941                                 if (ailp->player_awareness_type == 0)
 942                                         ailp->player_awareness_type = PA_WEAPON_ROBOT_COLLISION;
 943
 944                         }
 945
 946                         // If in multiplayer, only do if player visible.  If not multiplayer, do always.
 947                         if (!(Game_mode & GM_MULTI) || player_visibility)
 948                                 if (ai_multiplayer_awareness(obj, 75)) {
 949                                         ai_follow_path(obj, player_visibility, previous_visibility, &vec_to_player);
 950                                         ai_multi_send_robot_position(objnum, -1);
 951                                 }
 952
 953                         if (aip->GOAL_STATE != AIS_FLIN)
 954                                 aip->GOAL_STATE = AIS_LOCK;
 955                         else if (aip->CURRENT_STATE == AIS_FLIN)
 956                                 aip->GOAL_STATE = AIS_LOCK;
 957
 958                         // Bad to let run_from robot fire at player because it
 959                         // will cause a war in which it turns towards the player
 960                         // to fire and then towards its goal to move.
 961                         // do_firing_stuff(obj, player_visibility, &vec_to_player);
 962                         // Instead, do this:
 963                         // (Note, only drop if player is visible.  This prevents
 964                         // the bombs from being a giveaway, and also ensures that
 965                         // the robot is moving while it is dropping.  Also means
 966                         // fewer will be dropped.)
 967                         if ((ailp->next_fire <= 0) && (player_visibility)) {
 968                                 vms_vector fire_vec, fire_pos;
 969
 970                                 if (!ai_multiplayer_awareness(obj, 75))
 971                                         return;
 972
 973                                 fire_vec = obj->orient.fvec;
 974                                 vm_vec_negate(&fire_vec);
 975                                 vm_vec_add(&fire_pos, &obj->pos, &fire_vec);
 976
 977                                 if (aip->SUB_FLAGS & SUB_FLAGS_SPROX)
 978                                         Laser_create_new_easy( &fire_vec, &fire_pos, obj-Objects, ROBOT_SUPERPROX_ID, 1);
 979                                 else
 980                                         Laser_create_new_easy( &fire_vec, &fire_pos, obj-Objects, PROXIMITY_ID, 1);
 981
 982                                 ailp->next_fire = (F1_0/2)*(NDL+5 - Difficulty_level);      // Drop a proximity bomb every 5 seconds.
 983
 984 #ifdef NETWORK
 985 #ifndef SHAREWARE
 986                                 if (Game_mode & GM_MULTI)
 987                                 {
 988                                         ai_multi_send_robot_position(obj-Objects, -1);
 989                                         if (aip->SUB_FLAGS & SUB_FLAGS_SPROX)
 990                                                 multi_send_robot_fire(obj-Objects, -2, &fire_vec);
 991                                         else
 992                                                 multi_send_robot_fire(obj-Objects, -1, &fire_vec);
 993                                 }
 994 #endif
 995 #endif
 996                         }
 997                         break;
 998
 999                 case AIM_GOTO_PLAYER:
1000                 case AIM_GOTO_OBJECT:
1001                         ai_follow_path(obj, 2, previous_visibility, &vec_to_player);    // Follows path as if player can see robot.
1002                         ai_multi_send_robot_position(objnum, -1);
1003                         break;
1004
1005                 case AIM_FOLLOW_PATH: {
1006                         int anger_level = 65;
1007
1008                         if (aip->behavior == AIB_STATION)
1009                                 if (Point_segs[aip->hide_index + aip->path_length - 1].segnum == aip->hide_segment) {
1010                                         anger_level = 64;
1011                                         // mprintf((0, "Object %i, station, lowering anger to 64.\n"));
1012                                 }
1013
1014                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1015
1016                         if (Game_mode & (GM_MODEM | GM_SERIAL))
1017                                 if (!player_visibility && (dist_to_player > F1_0*70)) {
1018                                         ailp->mode = AIM_STILL;
1019                                         return;
1020                                 }
1021
1022                         if (!ai_multiplayer_awareness(obj, anger_level)) {
1023                                 if (maybe_ai_do_actual_firing_stuff(obj, aip)) {
1024                                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1025                                         ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1026                                 }
1027                                 return;
1028                         }
1029
1030                         ai_follow_path(obj, player_visibility, previous_visibility, &vec_to_player);
1031
1032                         if (aip->GOAL_STATE != AIS_FLIN)
1033                                 aip->GOAL_STATE = AIS_LOCK;
1034                         else if (aip->CURRENT_STATE == AIS_FLIN)
1035                                 aip->GOAL_STATE = AIS_LOCK;
1036
1037                         if (aip->behavior != AIB_RUN_FROM)
1038                                 do_firing_stuff(obj, player_visibility, &vec_to_player);
1039
1040                         if ((player_visibility == 2) && (aip->behavior != AIB_SNIPE) && (aip->behavior != AIB_FOLLOW) && (aip->behavior != AIB_RUN_FROM) && (obj->id != ROBOT_BRAIN) && (robptr->companion != 1) && (robptr->thief != 1)) {
1041                                 if (robptr->attack_type == 0)
1042                                         ailp->mode = AIM_CHASE_OBJECT;
1043                                 // This should not just be distance based, but also time-since-player-seen based.
1044                         } else if ((dist_to_player > F1_0*(20*(2*Difficulty_level + robptr->pursuit)))
1045                                                 && (GameTime - ailp->time_player_seen > (F1_0/2*(Difficulty_level+robptr->pursuit)))
1046                                                 && (player_visibility == 0)
1047                                                 && (aip->behavior == AIB_NORMAL)
1048                                                 && (ailp->mode == AIM_FOLLOW_PATH)) {
1049                                 ailp->mode = AIM_STILL;
1050                                 aip->hide_index = -1;
1051                                 aip->path_length = 0;
1052                         }
1053
1054                         ai_multi_send_robot_position(objnum, -1);
1055
1056                         break;
1057                 }
1058
1059                 case AIM_BEHIND:
1060                         if (!ai_multiplayer_awareness(obj, 71)) {
1061                                 if (maybe_ai_do_actual_firing_stuff(obj, aip)) {
1062                                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1063                                         ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1064                                 }
1065                                 return;
1066                         }
1067
1068                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1069
1070                         if (player_visibility == 2) {
1071                                 // Get behind the player.
1072                                 // Method:
1073                                 // If vec_to_player dot player_rear_vector > 0, behind is goal.
1074                                 // Else choose goal with larger dot from left, right.
1075                                 vms_vector  goal_point, goal_vector, vec_to_goal, rand_vec;
1076                                 fix         dot;
1077
1078                                 dot = vm_vec_dot(&ConsoleObject->orient.fvec, &vec_to_player);
1079                                 if (dot > 0) {          // Remember, we're interested in the rear vector dot being < 0.
1080                                         goal_vector = ConsoleObject->orient.fvec;
1081                                         vm_vec_negate(&goal_vector);
1082                                         // -- mprintf((0, "Goal is BEHIND\n"));
1083                                 } else {
1084                                         fix dot;
1085                                         dot = vm_vec_dot(&ConsoleObject->orient.rvec, &vec_to_player);
1086                                         goal_vector = ConsoleObject->orient.rvec;
1087                                         if (dot > 0) {
1088                                                 vm_vec_negate(&goal_vector);
1089                                                 // -- mprintf((0, "Goal is LEFT\n"));
1090                                         } else
1091                                                 ; // -- mprintf((0, "Goal is RIGHT\n"));
1092                                 }
1093
1094                                 vm_vec_scale(&goal_vector, 2*(ConsoleObject->size + obj->size + (((objnum*4 + FrameCount) & 63) << 12)));
1095                                 vm_vec_add(&goal_point, &ConsoleObject->pos, &goal_vector);
1096                                 make_random_vector(&rand_vec);
1097                                 vm_vec_scale_add2(&goal_point, &rand_vec, F1_0*8);
1098                                 vm_vec_sub(&vec_to_goal, &goal_point, &obj->pos);
1099                                 vm_vec_normalize_quick(&vec_to_goal);
1100                                 move_towards_vector(obj, &vec_to_goal, 0);
1101                                 ai_turn_towards_vector(&vec_to_player, obj, robptr->turn_time[Difficulty_level]);
1102                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1103                         }
1104
1105                         if (aip->GOAL_STATE != AIS_FLIN)
1106                                 aip->GOAL_STATE = AIS_LOCK;
1107                         else if (aip->CURRENT_STATE == AIS_FLIN)
1108                                 aip->GOAL_STATE = AIS_LOCK;
1109
1110                         ai_multi_send_robot_position(objnum, -1);
1111                         break;
1112
1113                 case AIM_STILL:
1114                         if ((dist_to_player < F1_0*120+Difficulty_level*F1_0*20) || (ailp->player_awareness_type >= PA_WEAPON_ROBOT_COLLISION-1)) {
1115                                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1116
1117                                 // turn towards vector if visible this time or last time, or rand
1118                                 // new!
1119                                 if ((player_visibility == 2) || (previous_visibility == 2)) { // -- MK, 06/09/95:  || ((d_rand() > 0x4000) && !(Game_mode & GM_MULTI))) {
1120                                         if (!ai_multiplayer_awareness(obj, 71)) {
1121                                                 if (maybe_ai_do_actual_firing_stuff(obj, aip))
1122                                                         ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1123                                                 return;
1124                                         }
1125                                         ai_turn_towards_vector(&vec_to_player, obj, robptr->turn_time[Difficulty_level]);
1126                                         ai_multi_send_robot_position(objnum, -1);
1127                                 }
1128
1129                                 do_firing_stuff(obj, player_visibility, &vec_to_player);
1130                                 if (player_visibility == 2) {  // Changed @mk, 09/21/95: Require that they be looking to evade.  Change, MK, 01/03/95 for Multiplayer reasons.  If robots can't see you (even with eyes on back of head), then don't do evasion.
1131                                         if (robptr->attack_type == 1) {
1132                                                 aip->behavior = AIB_NORMAL;
1133                                                 if (!ai_multiplayer_awareness(obj, 80)) {
1134                                                         if (maybe_ai_do_actual_firing_stuff(obj, aip))
1135                                                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1136                                                         return;
1137                                                 }
1138                                                 ai_move_relative_to_player(obj, ailp, dist_to_player, &vec_to_player, 0, 0, player_visibility);
1139                                                 if (ai_evaded) {
1140                                                         ai_multi_send_robot_position(objnum, 1);
1141                                                         ai_evaded = 0;
1142                                                 }
1143                                                 else
1144                                                         ai_multi_send_robot_position(objnum, -1);
1145                                         } else {
1146                                                 // Robots in hover mode are allowed to evade at half normal speed.
1147                                                 if (!ai_multiplayer_awareness(obj, 81)) {
1148                                                         if (maybe_ai_do_actual_firing_stuff(obj, aip))
1149                                                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1150                                                         return;
1151                                                 }
1152                                                 ai_move_relative_to_player(obj, ailp, dist_to_player, &vec_to_player, 0, 1, player_visibility);
1153                                                 if (ai_evaded) {
1154                                                         ai_multi_send_robot_position(objnum, -1);
1155                                                         ai_evaded = 0;
1156                                                 }
1157                                                 else
1158                                                         ai_multi_send_robot_position(objnum, -1);
1159                                         }
1160                                 } else if ((obj->segnum != aip->hide_segment) && (dist_to_player > F1_0*80) && (!(Game_mode & GM_MULTI))) {
1161                                         // If pretty far from the player, player cannot be
1162                                         // seen (obstructed) and in chase mode, switch to
1163                                         // follow path mode.
1164                                         // This has one desirable benefit of avoiding physics retries.
1165                                         if (aip->behavior == AIB_STATION) {
1166                                                 ailp->goal_segment = aip->hide_segment;
1167                                                 // -- mprintf((0, "(2) Object #%i going from STILL to STATION in frame %i.\n", objnum, FrameCount));
1168                                                 create_path_to_station(obj, 15);
1169                                         }
1170                                         break;
1171                                 }
1172                         }
1173
1174                         break;
1175                 case AIM_OPEN_DOOR: {       // trying to open a door.
1176                         vms_vector center_point, goal_vector;
1177                         Assert(obj->id == ROBOT_BRAIN);     // Make sure this guy is allowed to be in this mode.
1178
1179                         if (!ai_multiplayer_awareness(obj, 62))
1180                                 return;
1181                         compute_center_point_on_side(&center_point, &Segments[obj->segnum], aip->GOALSIDE);
1182                         vm_vec_sub(&goal_vector, &center_point, &obj->pos);
1183                         vm_vec_normalize_quick(&goal_vector);
1184                         ai_turn_towards_vector(&goal_vector, obj, robptr->turn_time[Difficulty_level]);
1185                         move_towards_vector(obj, &goal_vector, 0);
1186                         ai_multi_send_robot_position(objnum, -1);
1187
1188                         break;
1189                 }
1190
1191                 case AIM_SNIPE_WAIT:
1192                         break;
1193                 case AIM_SNIPE_RETREAT:
1194                         // -- if (ai_multiplayer_awareness(obj, 53))
1195                         // --   if (ailp->next_fire < -F1_0)
1196                         // --           ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1197                         break;
1198                 case AIM_SNIPE_RETREAT_BACKWARDS:
1199                 case AIM_SNIPE_ATTACK:
1200                 case AIM_SNIPE_FIRE:
1201                         if (ai_multiplayer_awareness(obj, 53)) {
1202                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1203                                 if (robptr->thief)
1204                                         ai_move_relative_to_player(obj, ailp, dist_to_player, &vec_to_player, 0, 0, player_visibility);
1205                                 break;
1206                         }
1207                         break;
1208
1209                 case AIM_THIEF_WAIT:
1210                 case AIM_THIEF_ATTACK:
1211                 case AIM_THIEF_RETREAT:
1212                 case AIM_WANDER:    // Used for Buddy Bot
1213                         break;
1214
1215                 default:
1216                         mprintf((0, "Unknown mode = %i in robot %i, behavior = %i\n", ailp->mode, obj-Objects, aip->behavior));
1217                         ailp->mode = AIM_CHASE_OBJECT;
1218                         break;
1219         }       // end: switch (ailp->mode) {
1220
1221         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
1222         // If the robot can see you, increase his awareness of you.
1223         // This prevents the problem of a robot looking right at you but doing nothing.
1224         // Assert(player_visibility != -1); // Means it didn't get initialized!
1225         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1226         if ((player_visibility == 2) && (aip->behavior != AIB_FOLLOW) && (!robptr->thief)) {
1227                 if ((ailp->player_awareness_type == 0) && (aip->SUB_FLAGS & SUB_FLAGS_CAMERA_AWAKE))
1228                         aip->SUB_FLAGS &= ~SUB_FLAGS_CAMERA_AWAKE;
1229                 else if (ailp->player_awareness_type == 0)
1230                         ailp->player_awareness_type = PA_PLAYER_COLLISION;
1231         }
1232
1233         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
1234         if (!object_animates) {
1235                 aip->CURRENT_STATE = aip->GOAL_STATE;
1236                 // mprintf((0, "Setting current to goal (%i) because object doesn't animate.\n", aip->GOAL_STATE));
1237         }
1238
1239         Assert(ailp->player_awareness_type <= AIE_MAX);
1240         Assert(aip->CURRENT_STATE < AIS_MAX);
1241         Assert(aip->GOAL_STATE < AIS_MAX);
1242
1243         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
1244         if (ailp->player_awareness_type) {
1245                 new_goal_state = Ai_transition_table[ailp->player_awareness_type-1][aip->CURRENT_STATE][aip->GOAL_STATE];
1246                 if (ailp->player_awareness_type == PA_WEAPON_ROBOT_COLLISION) {
1247                         // Decrease awareness, else this robot will flinch every frame.
1248                         ailp->player_awareness_type--;
1249                         ailp->player_awareness_time = F1_0*3;
1250                 }
1251
1252                 if (new_goal_state == AIS_ERR_)
1253                         new_goal_state = AIS_REST;
1254
1255                 if (aip->CURRENT_STATE == AIS_NONE)
1256                         aip->CURRENT_STATE = AIS_REST;
1257
1258                 aip->GOAL_STATE = new_goal_state;
1259
1260         }
1261
1262         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
1263         // If new state = fire, then set all gun states to fire.
1264         if ((aip->GOAL_STATE == AIS_FIRE) ) {
1265                 int i,num_guns;
1266                 num_guns = Robot_info[obj->id].n_guns;
1267                 for (i=0; i<num_guns; i++)
1268                         ailp->goal_state[i] = AIS_FIRE;
1269         }
1270
1271         // - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  - -  -
1272         // Hack by mk on 01/04/94, if a guy hasn't animated to the firing state, but his next_fire says ok to fire, bash him there
1273         if (ready_to_fire(robptr, ailp) && (aip->GOAL_STATE == AIS_FIRE))
1274                 aip->CURRENT_STATE = AIS_FIRE;
1275
1276         if ((aip->GOAL_STATE != AIS_FLIN)  && (obj->id != ROBOT_BRAIN)) {
1277                 switch (aip->CURRENT_STATE) {
1278                 case AIS_NONE:
1279                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1280
1281                         dot = vm_vec_dot(&obj->orient.fvec, &vec_to_player);
1282                         if (dot >= F1_0/2)
1283                                 if (aip->GOAL_STATE == AIS_REST)
1284                                         aip->GOAL_STATE = AIS_SRCH;
1285                         break;
1286                 case AIS_REST:
1287                         if (aip->GOAL_STATE == AIS_REST) {
1288                                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1289                                 if (ready_to_fire(robptr, ailp) && (player_visibility)) {
1290                                         // mprintf((0, "Setting goal state to fire from rest.\n"));
1291                                         aip->GOAL_STATE = AIS_FIRE;
1292                                 }
1293                         }
1294                         break;
1295                 case AIS_SRCH:
1296                         if (!ai_multiplayer_awareness(obj, 60))
1297                                 return;
1298
1299                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1300
1301                         if (player_visibility == 2) {
1302                                 ai_turn_towards_vector(&vec_to_player, obj, robptr->turn_time[Difficulty_level]);
1303                                 ai_multi_send_robot_position(objnum, -1);
1304                         }
1305                         break;
1306                 case AIS_LOCK:
1307                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1308
1309                         if (!(Game_mode & GM_MULTI) || (player_visibility)) {
1310                                 if (!ai_multiplayer_awareness(obj, 68))
1311                                         return;
1312
1313                                 if (player_visibility == 2) {   // @mk, 09/21/95, require that they be looking towards you to turn towards you.
1314                                         ai_turn_towards_vector(&vec_to_player, obj, robptr->turn_time[Difficulty_level]);
1315                                         ai_multi_send_robot_position(objnum, -1);
1316                                 }
1317                         }
1318                         break;
1319                 case AIS_FIRE:
1320                         compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1321
1322                         if (player_visibility == 2) {
1323                                 if (!ai_multiplayer_awareness(obj, (ROBOT_FIRE_AGITATION-1))) {
1324                                         if (Game_mode & GM_MULTI) {
1325                                                 ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1326                                                 return;
1327                                         }
1328                                 }
1329                                 ai_turn_towards_vector(&vec_to_player, obj, robptr->turn_time[Difficulty_level]);
1330                                 ai_multi_send_robot_position(objnum, -1);
1331                         }
1332
1333                         // Fire at player, if appropriate.
1334                         ai_do_actual_firing_stuff(obj, aip, ailp, robptr, &vec_to_player, dist_to_player, &gun_point, player_visibility, object_animates, aip->CURRENT_GUN);
1335
1336                         break;
1337                 case AIS_RECO:
1338                         if (!(obj_ref & 3)) {
1339                                 compute_vis_and_vec(obj, &vis_vec_pos, ailp, &vec_to_player, &player_visibility, robptr, &visibility_and_vec_computed);
1340                                 if (player_visibility == 2) {
1341                                         if (!ai_multiplayer_awareness(obj, 69))
1342                                                 return;
1343                                         ai_turn_towards_vector(&vec_to_player, obj, robptr->turn_time[Difficulty_level]);
1344                                         ai_multi_send_robot_position(objnum, -1);
1345                                 } // -- MK, 06/09/95: else if (!(Game_mode & GM_MULTI)) {
1346                         }
1347                         break;
1348                 case AIS_FLIN:
1349                         // mprintf((0, "State = flinch, goal = %i.\n", aip->GOAL_STATE));
1350                         break;
1351                 default:
1352                         mprintf((1, "Unknown mode for AI object #%i\n", objnum));
1353                         aip->GOAL_STATE = AIS_REST;
1354                         aip->CURRENT_STATE = AIS_REST;
1355                         break;
1356                 }
1357         } // end of: if (aip->GOAL_STATE != AIS_FLIN) {
1358
1359         // Switch to next gun for next fire.
1360         if (player_visibility == 0) {
1361                 aip->CURRENT_GUN++;
1362                 if (aip->CURRENT_GUN >= Robot_info[obj->id].n_guns)
1363                 {
1364                         if ((robptr->n_guns == 1) || (robptr->weapon_type2 == -1))  // Two weapon types hack.
1365                                 aip->CURRENT_GUN = 0;
1366                         else
1367                                 aip->CURRENT_GUN = 1;
1368                 }
1369         }
1370
1371 }
1372
1373 // ----------------------------------------------------------------------------
1374 void ai_do_cloak_stuff(void)
1375 {
1376         int i;
1377
1378         for (i=0; i<MAX_AI_CLOAK_INFO; i++) {
1379                 Ai_cloak_info[i].last_position = ConsoleObject->pos;
1380                 Ai_cloak_info[i].last_segment = ConsoleObject->segnum;
1381                 Ai_cloak_info[i].last_time = GameTime;
1382         }
1383
1384         // Make work for control centers.
1385         Believed_player_pos = Ai_cloak_info[0].last_position;
1386         Believed_player_seg = Ai_cloak_info[0].last_segment;
1387
1388 }
1389
1390 // ----------------------------------------------------------------------------
1391 // Returns false if awareness is considered too puny to add, else returns true.
1392 int add_awareness_event(object *objp, int type)
1393 {
1394         // If player cloaked and hit a robot, then increase awareness
1395         if ((type == PA_WEAPON_ROBOT_COLLISION) || (type == PA_WEAPON_WALL_COLLISION) || (type == PA_PLAYER_COLLISION))
1396                 ai_do_cloak_stuff();
1397
1398         if (Num_awareness_events < MAX_AWARENESS_EVENTS) {
1399                 if ((type == PA_WEAPON_WALL_COLLISION) || (type == PA_WEAPON_ROBOT_COLLISION))
1400                         if (objp->id == VULCAN_ID)
1401                                 if (d_rand() > 3276)
1402                                         return 0;       // For vulcan cannon, only about 1/10 actually cause awareness
1403
1404                 Awareness_events[Num_awareness_events].segnum = objp->segnum;
1405                 Awareness_events[Num_awareness_events].pos = objp->pos;
1406                 Awareness_events[Num_awareness_events].type = type;
1407                 Num_awareness_events++;
1408         } else {
1409                 //Int3();   // Hey -- Overflowed Awareness_events, make more or something
1410                 // This just gets ignored, so you can just
1411                 // continue.
1412         }
1413         return 1;
1414
1415 }
1416
1417 // ----------------------------------------------------------------------------------
1418 // Robots will become aware of the player based on something that occurred.
1419 // The object (probably player or weapon) which created the awareness is objp.
1420 void create_awareness_event(object *objp, int type)
1421 {
1422         // If not in multiplayer, or in multiplayer with robots, do this, else unnecessary!
1423         if (!(Game_mode & GM_MULTI) || (Game_mode & GM_MULTI_ROBOTS)) {
1424                 if (add_awareness_event(objp, type)) {
1425                         if (((d_rand() * (type+4)) >> 15) > 4)
1426                                 Overall_agitation++;
1427                         if (Overall_agitation > OVERALL_AGITATION_MAX)
1428                                 Overall_agitation = OVERALL_AGITATION_MAX;
1429                 }
1430         }
1431 }
1432
1433 sbyte New_awareness[MAX_SEGMENTS];
1434
1435 // ----------------------------------------------------------------------------------
1436 void pae_aux(int segnum, int type, int level)
1437 {
1438         int j;
1439
1440         if (New_awareness[segnum] < type)
1441                 New_awareness[segnum] = type;
1442
1443         // Process children.
1444         for (j=0; j<MAX_SIDES_PER_SEGMENT; j++)
1445                 if (IS_CHILD(Segments[segnum].children[j]))
1446                 {
1447                         if (level <= 3)
1448                         {
1449                                 if (type == 4)
1450                                         pae_aux(Segments[segnum].children[j], type-1, level+1);
1451                                 else
1452                                         pae_aux(Segments[segnum].children[j], type, level+1);
1453                         }
1454                 }
1455 }
1456
1457
1458 // ----------------------------------------------------------------------------------
1459 void process_awareness_events(void)
1460 {
1461         int i;
1462
1463         if (!(Game_mode & GM_MULTI) || (Game_mode & GM_MULTI_ROBOTS)) {
1464                 memset(New_awareness, 0, sizeof(New_awareness[0]) * (Highest_segment_index+1));
1465
1466                 for (i=0; i<Num_awareness_events; i++)
1467                         pae_aux(Awareness_events[i].segnum, Awareness_events[i].type, 1);
1468
1469         }
1470
1471         Num_awareness_events = 0;
1472 }
1473
1474 // ----------------------------------------------------------------------------------
1475 void set_player_awareness_all(void)
1476 {
1477         int i;
1478
1479         process_awareness_events();
1480
1481         for (i=0; i<=Highest_object_index; i++)
1482                 if (Objects[i].control_type == CT_AI) {
1483                         if (New_awareness[Objects[i].segnum] > Ai_local_info[i].player_awareness_type) {
1484                                 Ai_local_info[i].player_awareness_type = New_awareness[Objects[i].segnum];
1485                                 Ai_local_info[i].player_awareness_time = PLAYER_AWARENESS_INITIAL_TIME;
1486                         }
1487
1488                         // Clear the bit that says this robot is only awake because a camera woke it up.
1489                         if (New_awareness[Objects[i].segnum] > Ai_local_info[i].player_awareness_type)
1490                                 Objects[i].ctype.ai_info.SUB_FLAGS &= ~SUB_FLAGS_CAMERA_AWAKE;
1491                 }
1492 }
1493
1494 #ifndef NDEBUG
1495 int Ai_dump_enable = 0;
1496
1497 FILE *Ai_dump_file = NULL;
1498
1499 char Ai_error_message[128] = "";
1500
1501 // ----------------------------------------------------------------------------------
1502 void force_dump_ai_objects_all(char *msg)
1503 {
1504         int tsave;
1505
1506         tsave = Ai_dump_enable;
1507
1508         Ai_dump_enable = 1;
1509
1510         sprintf(Ai_error_message, "%s\n", msg);
1511         //dump_ai_objects_all();
1512         Ai_error_message[0] = 0;
1513
1514         Ai_dump_enable = tsave;
1515 }
1516
1517 // ----------------------------------------------------------------------------------
1518 void turn_off_ai_dump(void)
1519 {
1520         if (Ai_dump_file != NULL)
1521                 fclose(Ai_dump_file);
1522
1523         Ai_dump_file = NULL;
1524 }
1525
1526 #endif
1527
1528 extern void do_boss_dying_frame(object *objp);
1529
1530 // ----------------------------------------------------------------------------------
1531 // Do things which need to get done for all AI objects each frame.
1532 // This includes:
1533 //  Setting player_awareness (a fix, time in seconds which object is aware of player)
1534 void do_ai_frame_all(void)
1535 {
1536 #ifndef NDEBUG
1537         //dump_ai_objects_all();
1538 #endif
1539
1540         set_player_awareness_all();
1541
1542         if (Ai_last_missile_camera != -1) {
1543                 // Clear if supposed misisle camera is not a weapon, or just every so often, just in case.
1544                 if (((FrameCount & 0x0f) == 0) || (Objects[Ai_last_missile_camera].type != OBJ_WEAPON)) {
1545                         int i;
1546
1547                         Ai_last_missile_camera = -1;
1548                         for (i=0; i<=Highest_object_index; i++)
1549                                 if (Objects[i].type == OBJ_ROBOT)
1550                                         Objects[i].ctype.ai_info.SUB_FLAGS &= ~SUB_FLAGS_CAMERA_AWAKE;
1551                 }
1552         }
1553
1554         // (Moved here from do_boss_stuff() because that only gets called if robot aware of player.)
1555         if (Boss_dying) {
1556                 int i;
1557
1558                 for (i=0; i<=Highest_object_index; i++)
1559                         if (Objects[i].type == OBJ_ROBOT)
1560                                 if (Robot_info[Objects[i].id].boss_flag)
1561                                         do_boss_dying_frame(&Objects[i]);
1562         }
1563 }
1564
1565
1566 extern int Final_boss_is_dead;
1567 extern fix Boss_invulnerable_dot;
1568
1569 // Initializations to be performed for all robots for a new level.
1570 void init_robots_for_level(void)
1571 {
1572         Overall_agitation = 0;
1573         Final_boss_is_dead=0;
1574
1575         Buddy_objnum = 0;
1576         Buddy_allowed_to_talk = 0;
1577
1578         Boss_invulnerable_dot = F1_0/4 - i2f(Difficulty_level)/8;
1579         Boss_dying_start_time = 0;
1580 }
1581
1582 int ai_save_state(PHYSFS_file *fp)
1583 {
1584         PHYSFS_write(fp, &Ai_initialized, sizeof(int), 1);
1585         PHYSFS_write(fp, &Overall_agitation, sizeof(int), 1);
1586         PHYSFS_write(fp, Ai_local_info, sizeof(ai_local) * MAX_OBJECTS, 1);
1587         PHYSFS_write(fp, Point_segs, sizeof(point_seg) * MAX_POINT_SEGS, 1);
1588         PHYSFS_write(fp, Ai_cloak_info, sizeof(ai_cloak_info) * MAX_AI_CLOAK_INFO, 1);
1589         PHYSFS_write(fp, &Boss_cloak_start_time, sizeof(fix), 1);
1590         PHYSFS_write(fp, &Boss_cloak_end_time, sizeof(fix), 1);
1591         PHYSFS_write(fp, &Last_teleport_time, sizeof(fix), 1);
1592         PHYSFS_write(fp, &Boss_teleport_interval, sizeof(fix), 1);
1593         PHYSFS_write(fp, &Boss_cloak_interval, sizeof(fix), 1);
1594         PHYSFS_write(fp, &Boss_cloak_duration, sizeof(fix), 1);
1595         PHYSFS_write(fp, &Last_gate_time, sizeof(fix), 1);
1596         PHYSFS_write(fp, &Gate_interval, sizeof(fix), 1);
1597         PHYSFS_write(fp, &Boss_dying_start_time, sizeof(fix), 1);
1598         PHYSFS_write(fp, &Boss_dying, sizeof(int), 1);
1599         PHYSFS_write(fp, &Boss_dying_sound_playing, sizeof(int), 1);
1600         PHYSFS_write(fp, &Boss_hit_time, sizeof(fix), 1);
1601         // -- MK, 10/21/95, unused! -- PHYSFS_write(fp, &Boss_been_hit, sizeof(int), 1);
1602
1603         PHYSFS_write(fp, &Escort_kill_object, sizeof(Escort_kill_object), 1);
1604         PHYSFS_write(fp, &Escort_last_path_created, sizeof(Escort_last_path_created), 1);
1605         PHYSFS_write(fp, &Escort_goal_object, sizeof(Escort_goal_object), 1);
1606         PHYSFS_write(fp, &Escort_special_goal, sizeof(Escort_special_goal), 1);
1607         PHYSFS_write(fp, &Escort_goal_index, sizeof(Escort_goal_index), 1);
1608         PHYSFS_write(fp, &Stolen_items, sizeof(Stolen_items[0])*MAX_STOLEN_ITEMS, 1);
1609
1610         {
1611                 int temp;
1612                 temp = Point_segs_free_ptr - Point_segs;
1613                 PHYSFS_write(fp, &temp, sizeof(int), 1);
1614         }
1615
1616         PHYSFS_write(fp, &Num_boss_teleport_segs, sizeof(Num_boss_teleport_segs), 1);
1617         PHYSFS_write(fp, &Num_boss_gate_segs, sizeof(Num_boss_gate_segs), 1);
1618
1619         if (Num_boss_gate_segs)
1620                 PHYSFS_write(fp, Boss_gate_segs, sizeof(Boss_gate_segs[0]), Num_boss_gate_segs);
1621
1622         if (Num_boss_teleport_segs)
1623                 PHYSFS_write(fp, Boss_teleport_segs, sizeof(Boss_teleport_segs[0]), Num_boss_teleport_segs);
1624
1625         return 1;
1626 }
1627
1628 int ai_restore_state(PHYSFS_file *fp, int version)
1629 {
1630         PHYSFS_read(fp, &Ai_initialized, sizeof(int), 1);
1631         PHYSFS_read(fp, &Overall_agitation, sizeof(int), 1);
1632         PHYSFS_read(fp, Ai_local_info, sizeof(ai_local) * MAX_OBJECTS, 1);
1633         PHYSFS_read(fp, Point_segs, sizeof(point_seg) * MAX_POINT_SEGS, 1);
1634         PHYSFS_read(fp, Ai_cloak_info, sizeof(ai_cloak_info) * MAX_AI_CLOAK_INFO, 1);
1635         PHYSFS_read(fp, &Boss_cloak_start_time, sizeof(fix), 1);
1636         PHYSFS_read(fp, &Boss_cloak_end_time, sizeof(fix), 1);
1637         PHYSFS_read(fp, &Last_teleport_time, sizeof(fix), 1);
1638         PHYSFS_read(fp, &Boss_teleport_interval, sizeof(fix), 1);
1639         PHYSFS_read(fp, &Boss_cloak_interval, sizeof(fix), 1);
1640         PHYSFS_read(fp, &Boss_cloak_duration, sizeof(fix), 1);
1641         PHYSFS_read(fp, &Last_gate_time, sizeof(fix), 1);
1642         PHYSFS_read(fp, &Gate_interval, sizeof(fix), 1);
1643         PHYSFS_read(fp, &Boss_dying_start_time, sizeof(fix), 1);
1644         PHYSFS_read(fp, &Boss_dying, sizeof(int), 1);
1645         PHYSFS_read(fp, &Boss_dying_sound_playing, sizeof(int), 1);
1646         PHYSFS_read(fp, &Boss_hit_time, sizeof(fix), 1);
1647         // -- MK, 10/21/95, unused! -- PHYSFS_read(fp, &Boss_been_hit, sizeof(int), 1);
1648
1649         if (version >= 8) {
1650                 PHYSFS_read(fp, &Escort_kill_object, sizeof(Escort_kill_object), 1);
1651                 PHYSFS_read(fp, &Escort_last_path_created, sizeof(Escort_last_path_created), 1);
1652                 PHYSFS_read(fp, &Escort_goal_object, sizeof(Escort_goal_object), 1);
1653                 PHYSFS_read(fp, &Escort_special_goal, sizeof(Escort_special_goal), 1);
1654                 PHYSFS_read(fp, &Escort_goal_index, sizeof(Escort_goal_index), 1);
1655                 PHYSFS_read(fp, &Stolen_items, sizeof(Stolen_items[0]) * MAX_STOLEN_ITEMS, 1);
1656         } else {
1657                 int i;
1658
1659                 Escort_kill_object = -1;
1660                 Escort_last_path_created = 0;
1661                 Escort_goal_object = ESCORT_GOAL_UNSPECIFIED;
1662                 Escort_special_goal = -1;
1663                 Escort_goal_index = -1;
1664
1665                 for (i=0; i<MAX_STOLEN_ITEMS; i++) {
1666                         Stolen_items[i] = 255;
1667                 }
1668
1669         }
1670
1671         if (version >= 15) {
1672                 int temp;
1673                 PHYSFS_read(fp, &temp, sizeof(int), 1);
1674                 Point_segs_free_ptr = &Point_segs[temp];
1675         } else
1676                 ai_reset_all_paths();
1677
1678         if (version >= 21) {
1679                 PHYSFS_read(fp, &Num_boss_teleport_segs, sizeof(Num_boss_teleport_segs), 1);
1680                 PHYSFS_read(fp, &Num_boss_gate_segs, sizeof(Num_boss_gate_segs), 1);
1681
1682                 if (Num_boss_gate_segs)
1683                         PHYSFS_read(fp, Boss_gate_segs, sizeof(Boss_gate_segs[0]), Num_boss_gate_segs);
1684
1685                 if (Num_boss_teleport_segs)
1686                         PHYSFS_read(fp, Boss_teleport_segs, sizeof(Boss_teleport_segs[0]), Num_boss_teleport_segs);
1687         } else {
1688                 // -- Num_boss_teleport_segs = 1;
1689                 // -- Num_boss_gate_segs = 1;
1690                 // -- Boss_teleport_segs[0] = 0;
1691                 // -- Boss_gate_segs[0] = 0;
1692                 // Note: Maybe better to leave alone...will probably be ok.
1693                 mprintf((1, "Warning: If you fight the boss, he might teleport to segment #0!\n"));
1694         }
1695
1696         return 1;
1697 }