qcsrc/common/physics/player.qc

   1 #include "player.qh"
   2 #include "../triggers/include.qh"
   3 #include "../viewloc.qh"
   4
   5 #ifdef SVQC
   6
   7 #include <server/miscfunctions.qh>
   8 #include "../triggers/trigger/viewloc.qh"
   9
  10 // client side physics
  11 bool Physics_Valid(string thecvar)
  12 {
  13         return autocvar_g_physics_clientselect && thecvar != "" && thecvar && thecvar != "default" && strhasword(autocvar_g_physics_clientselect_options, thecvar);
  14 }
  15
  16 float Physics_ClientOption(entity this, string option, float defaultval)
  17 {
  18         if(IS_REAL_CLIENT(this) && Physics_Valid(this.cvar_cl_physics))
  19         {
  20                 string s = strcat("g_physics_", this.cvar_cl_physics, "_", option);
  21                 if(cvar_type(s) & CVAR_TYPEFLAG_EXISTS)
  22                         return cvar(s);
  23         }
  24         if(autocvar_g_physics_clientselect && autocvar_g_physics_clientselect_default)
  25         {
  26                 string s = strcat("g_physics_", autocvar_g_physics_clientselect_default, "_", option);
  27                 if(cvar_type(s) & CVAR_TYPEFLAG_EXISTS)
  28                         return cvar(s);
  29         }
  30         return defaultval;
  31 }
  32
  33 void Physics_UpdateStats(entity this, float maxspd_mod)
  34 {
  35         STAT(MOVEVARS_AIRACCEL_QW, this) = AdjustAirAccelQW(Physics_ClientOption(this, "airaccel_qw", autocvar_sv_airaccel_qw), maxspd_mod);
  36         STAT(MOVEVARS_AIRSTRAFEACCEL_QW, this) = (Physics_ClientOption(this, "airstrafeaccel_qw", autocvar_sv_airstrafeaccel_qw))
  37                 ? AdjustAirAccelQW(Physics_ClientOption(this, "airstrafeaccel_qw", autocvar_sv_airstrafeaccel_qw), maxspd_mod)
  38                 : 0;
  39         STAT(MOVEVARS_AIRSPEEDLIMIT_NONQW, this) = Physics_ClientOption(this, "airspeedlimit_nonqw", autocvar_sv_airspeedlimit_nonqw) * maxspd_mod;
  40         STAT(MOVEVARS_MAXSPEED, this) = Physics_ClientOption(this, "maxspeed", autocvar_sv_maxspeed) * maxspd_mod; // also slow walking
  41
  42         STAT(PL_MIN, this) = autocvar_sv_player_mins;
  43         STAT(PL_MAX, this) = autocvar_sv_player_maxs;
  44         STAT(PL_VIEW_OFS, this) = autocvar_sv_player_viewoffset;
  45         STAT(PL_CROUCH_MIN, this) = autocvar_sv_player_crouch_mins;
  46         STAT(PL_CROUCH_MAX, this) = autocvar_sv_player_crouch_maxs;
  47         STAT(PL_CROUCH_VIEW_OFS, this) = autocvar_sv_player_crouch_viewoffset;
  48
  49         // old stats
  50         // fix some new settings
  51         STAT(MOVEVARS_AIRACCEL_QW_STRETCHFACTOR, this) = Physics_ClientOption(this, "airaccel_qw_stretchfactor", autocvar_sv_airaccel_qw_stretchfactor);
  52         STAT(MOVEVARS_MAXAIRSTRAFESPEED, this) = Physics_ClientOption(this, "maxairstrafespeed", autocvar_sv_maxairstrafespeed);
  53         STAT(MOVEVARS_MAXAIRSPEED, this) = Physics_ClientOption(this, "maxairspeed", autocvar_sv_maxairspeed);
  54         STAT(MOVEVARS_AIRSTRAFEACCELERATE, this) = Physics_ClientOption(this, "airstrafeaccelerate", autocvar_sv_airstrafeaccelerate);
  55         STAT(MOVEVARS_WARSOWBUNNY_TURNACCEL, this) = Physics_ClientOption(this, "warsowbunny_turnaccel", autocvar_sv_warsowbunny_turnaccel);
  56         STAT(MOVEVARS_AIRACCEL_SIDEWAYS_FRICTION, this) = Physics_ClientOption(this, "airaccel_sideways_friction", autocvar_sv_airaccel_sideways_friction);
  57         STAT(MOVEVARS_AIRCONTROL, this) = Physics_ClientOption(this, "aircontrol", autocvar_sv_aircontrol);
  58         STAT(MOVEVARS_AIRCONTROL_POWER, this) = Physics_ClientOption(this, "aircontrol_power", autocvar_sv_aircontrol_power);
  59         STAT(MOVEVARS_AIRCONTROL_BACKWARDS, this) = Physics_ClientOption(this, "aircontrol_backwards", autocvar_sv_aircontrol_backwards);
  60         STAT(MOVEVARS_AIRCONTROL_PENALTY, this) = Physics_ClientOption(this, "aircontrol_penalty", autocvar_sv_aircontrol_penalty);
  61         STAT(MOVEVARS_WARSOWBUNNY_AIRFORWARDACCEL, this) = Physics_ClientOption(this, "warsowbunny_airforwardaccel", autocvar_sv_warsowbunny_airforwardaccel);
  62         STAT(MOVEVARS_WARSOWBUNNY_TOPSPEED, this) = Physics_ClientOption(this, "warsowbunny_topspeed", autocvar_sv_warsowbunny_topspeed);
  63         STAT(MOVEVARS_WARSOWBUNNY_ACCEL, this) = Physics_ClientOption(this, "warsowbunny_accel", autocvar_sv_warsowbunny_accel);
  64         STAT(MOVEVARS_WARSOWBUNNY_BACKTOSIDERATIO, this) = Physics_ClientOption(this, "warsowbunny_backtosideratio", autocvar_sv_warsowbunny_backtosideratio);
  65         STAT(MOVEVARS_FRICTION, this) = Physics_ClientOption(this, "friction", autocvar_sv_friction);
  66         STAT(MOVEVARS_ACCELERATE, this) = Physics_ClientOption(this, "accelerate", autocvar_sv_accelerate);
  67         STAT(MOVEVARS_STOPSPEED, this) = Physics_ClientOption(this, "stopspeed", autocvar_sv_stopspeed);
  68         STAT(MOVEVARS_AIRACCELERATE, this) = Physics_ClientOption(this, "airaccelerate", autocvar_sv_airaccelerate);
  69         STAT(MOVEVARS_AIRSTOPACCELERATE, this) = Physics_ClientOption(this, "airstopaccelerate", autocvar_sv_airstopaccelerate);
  70         STAT(MOVEVARS_JUMPVELOCITY, this) = Physics_ClientOption(this, "jumpvelocity", autocvar_sv_jumpvelocity);
  71         STAT(MOVEVARS_TRACK_CANJUMP, this) = Physics_ClientOption(this, "track_canjump", autocvar_sv_track_canjump);
  72 }
  73 #endif
  74
  75 float IsMoveInDirection(vector mv, float ang) // key mix factor
  76 {
  77         if (mv_x == 0 && mv_y == 0)
  78                 return 0; // avoid division by zero
  79         ang -= RAD2DEG * atan2(mv_y, mv_x);
  80         ang = remainder(ang, 360) / 45;
  81         return ang > 1 ? 0 : ang < -1 ? 0 : 1 - fabs(ang);
  82 }
  83
  84 float GeomLerp(float a, float _lerp, float b)
  85 {
  86         return a == 0 ? (_lerp < 1 ? 0 : b)
  87                 : b == 0 ? (_lerp > 0 ? 0 : a)
  88                 : a * (fabs(b / a) ** _lerp);
  89 }
  90
  91 void PM_ClientMovement_UpdateStatus(entity this)
  92 {
  93 #ifdef CSQC
  94         if(!IS_PLAYER(this))
  95                 return;
  96
  97         // set crouched
  98         bool do_crouch = PHYS_INPUT_BUTTON_CROUCH(this);
  99         for(int slot = 0; slot < MAX_WEAPONSLOTS; ++slot)
 100         {
 101                 entity wep = viewmodels[slot];
 102                 if(wep.hook && !wasfreed(wep.hook))
 103                 {
 104                         do_crouch = false;
 105                         break; // don't bother checking the others
 106                 }
 107         }
 108         if(this.waterlevel >= WATERLEVEL_SWIMMING)
 109                 do_crouch = false;
 110         if(hud != HUD_NORMAL)
 111                 do_crouch = false;
 112         if(STAT(FROZEN, this))
 113                 do_crouch = false;
 114
 115         if (do_crouch)
 116         {
 117                 // wants to crouch, this always works
 118                 if (!IS_DUCKED(this)) SET_DUCKED(this);
 119         }
 120         else
 121         {
 122                 // wants to stand, if currently crouching we need to check for a low ceiling first
 123                 if (IS_DUCKED(this))
 124                 {
 125                         tracebox(this.origin, STAT(PL_MIN, this), STAT(PL_MAX, this), this.origin, MOVE_NORMAL, this);
 126                         if (!trace_startsolid) UNSET_DUCKED(this);
 127                 }
 128         }
 129
 130         if (IS_ONGROUND(this) || this.velocity.z <= 0 || PHYS_WATERJUMP_TIME(this) <= 0)
 131                 PHYS_WATERJUMP_TIME(this) = 0;
 132 #endif
 133 }
 134
 135 void CPM_PM_Aircontrol(entity this, float dt, vector wishdir, float wishspeed)
 136 {
 137         float movity = IsMoveInDirection(this.movement, 0);
 138         if(PHYS_AIRCONTROL_BACKWARDS(this))
 139                 movity += IsMoveInDirection(this.movement, 180);
 140
 141         float k = 32 * (2 * movity - 1);
 142         if (k <= 0)
 143                 return;
 144
 145         k *= bound(0, wishspeed / PHYS_MAXAIRSPEED(this), 1);
 146
 147         float zspeed = this.velocity_z;
 148         this.velocity_z = 0;
 149         float xyspeed = vlen(this.velocity);
 150         this.velocity = normalize(this.velocity);
 151
 152         float dot = this.velocity * wishdir;
 153
 154         if (dot > 0) // we can't change direction while slowing down
 155         {
 156                 k *= (dot ** PHYS_AIRCONTROL_POWER(this)) * dt;
 157                 xyspeed = max(0, xyspeed - PHYS_AIRCONTROL_PENALTY(this) * sqrt(max(0, 1 - dot*dot)) * k/32);
 158                 k *= PHYS_AIRCONTROL(this);
 159                 this.velocity = normalize(this.velocity * xyspeed + wishdir * k);
 160         }
 161
 162         this.velocity = this.velocity * xyspeed;
 163         this.velocity_z = zspeed;
 164 }
 165
 166 float AdjustAirAccelQW(float accelqw, float factor)
 167 {
 168         return copysign(bound(0.000001, 1 - (1 - fabs(accelqw)) * factor, 1), accelqw);
 169 }
 170
 171 // example config for alternate speed clamping:
 172 //   sv_airaccel_qw 0.8
 173 //   sv_airaccel_sideways_friction 0
 174 //   prvm_globalset server speedclamp_mode 1
 175 //     (or 2)
 176 void PM_Accelerate(entity this, float dt, vector wishdir, float wishspeed, float wishspeed0, float accel, float accelqw, float stretchfactor, float sidefric, float speedlimit)
 177 {
 178         float speedclamp = stretchfactor > 0 ? stretchfactor
 179         : accelqw < 0 ? 1 // full clamping, no stretch
 180         : -1; // no clamping
 181
 182         accelqw = fabs(accelqw);
 183
 184         if (GAMEPLAYFIX_Q2AIRACCELERATE)
 185                 wishspeed0 = wishspeed; // don't need to emulate this Q1 bug
 186
 187         float vel_straight = this.velocity * wishdir;
 188         float vel_z = this.velocity_z;
 189         vector vel_xy = vec2(this.velocity);
 190         vector vel_perpend = vel_xy - vel_straight * wishdir;
 191
 192         float step = accel * dt * wishspeed0;
 193
 194         float vel_xy_current  = vlen(vel_xy);
 195         if (speedlimit)
 196                 accelqw = AdjustAirAccelQW(accelqw, (speedlimit - bound(wishspeed, vel_xy_current, speedlimit)) / max(1, speedlimit - wishspeed));
 197         float vel_xy_forward =  vel_xy_current  + bound(0, wishspeed - vel_xy_current, step) * accelqw + step * (1 - accelqw);
 198         float vel_xy_backward = vel_xy_current  - bound(0, wishspeed + vel_xy_current, step) * accelqw - step * (1 - accelqw);
 199         vel_xy_backward = max(0, vel_xy_backward); // not that it REALLY occurs that this would cause wrong behaviour afterwards
 200         vel_straight =          vel_straight    + bound(0, wishspeed - vel_straight,   step) * accelqw + step * (1 - accelqw);
 201
 202         if (sidefric < 0 && (vel_perpend*vel_perpend))
 203                 // negative: only apply so much sideways friction to stay below the speed you could get by "braking"
 204         {
 205                 float f = max(0, 1 + dt * wishspeed * sidefric);
 206                 float themin = (vel_xy_backward * vel_xy_backward - vel_straight * vel_straight) / (vel_perpend * vel_perpend);
 207                 // assume: themin > 1
 208                 // vel_xy_backward*vel_xy_backward - vel_straight*vel_straight > vel_perpend*vel_perpend
 209                 // vel_xy_backward*vel_xy_backward > vel_straight*vel_straight + vel_perpend*vel_perpend
 210                 // vel_xy_backward*vel_xy_backward > vel_xy * vel_xy
 211                 // obviously, this cannot be
 212                 if (themin <= 0)
 213                         vel_perpend *= f;
 214                 else
 215                 {
 216                         themin = sqrt(themin);
 217                         vel_perpend *= max(themin, f);
 218                 }
 219         }
 220         else
 221                 vel_perpend *= max(0, 1 - dt * wishspeed * sidefric);
 222
 223         vel_xy = vel_straight * wishdir + vel_perpend;
 224
 225         if (speedclamp >= 0)
 226         {
 227                 float vel_xy_preclamp;
 228                 vel_xy_preclamp = vlen(vel_xy);
 229                 if (vel_xy_preclamp > 0) // prevent division by zero
 230                 {
 231                         vel_xy_current += (vel_xy_forward - vel_xy_current) * speedclamp;
 232                         if (vel_xy_current < vel_xy_preclamp)
 233                                 vel_xy *= (vel_xy_current / vel_xy_preclamp);
 234                 }
 235         }
 236
 237         this.velocity = vel_xy + vel_z * '0 0 1';
 238 }
 239
 240 void PM_AirAccelerate(entity this, float dt, vector wishdir, float wishspeed)
 241 {
 242         if (wishspeed == 0)
 243                 return;
 244
 245         vector curvel = this.velocity;
 246         curvel_z = 0;
 247         float curspeed = vlen(curvel);
 248
 249         if (wishspeed > curspeed * 1.01)
 250                 wishspeed = min(wishspeed, curspeed + PHYS_WARSOWBUNNY_AIRFORWARDACCEL(this) * PHYS_MAXSPEED(this) * dt);
 251         else
 252         {
 253                 float f = max(0, (PHYS_WARSOWBUNNY_TOPSPEED(this) - curspeed) / (PHYS_WARSOWBUNNY_TOPSPEED(this) - PHYS_MAXSPEED(this)));
 254                 wishspeed = max(curspeed, PHYS_MAXSPEED(this)) + PHYS_WARSOWBUNNY_ACCEL(this) * f * PHYS_MAXSPEED(this) * dt;
 255         }
 256         vector wishvel = wishdir * wishspeed;
 257         vector acceldir = wishvel - curvel;
 258         float addspeed = vlen(acceldir);
 259         acceldir = normalize(acceldir);
 260
 261         float accelspeed = min(addspeed, PHYS_WARSOWBUNNY_TURNACCEL(this) * PHYS_MAXSPEED(this) * dt);
 262
 263         if (PHYS_WARSOWBUNNY_BACKTOSIDERATIO(this) < 1)
 264         {
 265                 vector curdir = normalize(curvel);
 266                 float dot = acceldir * curdir;
 267                 if (dot < 0)
 268                         acceldir -= (1 - PHYS_WARSOWBUNNY_BACKTOSIDERATIO(this)) * dot * curdir;
 269         }
 270
 271         this.velocity += accelspeed * acceldir;
 272 }
 273
 274
 275 /*
 276 =============
 277 PlayerJump
 278
 279 When you press the jump key
 280 returns true if handled
 281 =============
 282 */
 283 bool PlayerJump(entity this)
 284 {
 285         if (PHYS_FROZEN(this))
 286                 return true; // no jumping in freezetag when frozen
 287
 288 #ifdef SVQC
 289         if (this.player_blocked)
 290                 return true; // no jumping while blocked
 291 #endif
 292
 293         bool doublejump = false;
 294         float mjumpheight = PHYS_JUMPVELOCITY(this);
 295         bool track_jump = PHYS_CL_TRACK_CANJUMP(this);
 296
 297         if (MUTATOR_CALLHOOK(PlayerJump, this, mjumpheight, doublejump))
 298                 return true;
 299
 300         mjumpheight = M_ARGV(1, float);
 301         doublejump = M_ARGV(2, bool);
 302
 303         if (this.waterlevel >= WATERLEVEL_SWIMMING)
 304         {
 305                 if(this.viewloc)
 306                 {
 307                         doublejump = true;
 308                         mjumpheight *= 0.7;
 309                         track_jump = true;
 310                 }
 311                 else
 312                 {
 313                         this.velocity_z = PHYS_MAXSPEED(this) * 0.7;
 314                         return true;
 315                 }
 316         }
 317
 318         if (!doublejump)
 319                 if (!IS_ONGROUND(this) && !IS_ONSLICK(this))
 320                         return IS_JUMP_HELD(this);
 321
 322         if(PHYS_TRACK_CANJUMP(this))
 323                 track_jump = true;
 324
 325         if (track_jump)
 326                 if (IS_JUMP_HELD(this))
 327                         return true;
 328
 329         // sv_jumpspeedcap_min/sv_jumpspeedcap_max act as baseline
 330         // velocity bounds.  Final velocity is bound between (jumpheight *
 331         // min + jumpheight) and (jumpheight * max + jumpheight);
 332
 333         if(PHYS_JUMPSPEEDCAP_MIN != "")
 334         {
 335                 float minjumpspeed = mjumpheight * stof(PHYS_JUMPSPEEDCAP_MIN);
 336
 337                 if (this.velocity_z < minjumpspeed)
 338                         mjumpheight += minjumpspeed - this.velocity_z;
 339         }
 340
 341         if(PHYS_JUMPSPEEDCAP_MAX != "")
 342         {
 343                 // don't do jump speedcaps on ramps to preserve old xonotic ramjump style
 344                 tracebox(this.origin + '0 0 0.01', this.mins, this.maxs, this.origin - '0 0 0.01', MOVE_NORMAL, this);
 345
 346                 if (!(trace_fraction < 1 && trace_plane_normal_z < 0.98 && PHYS_JUMPSPEEDCAP_DISABLE_ONRAMPS(this)))
 347                 {
 348                         float maxjumpspeed = mjumpheight * stof(PHYS_JUMPSPEEDCAP_MAX);
 349
 350                         if (this.velocity_z > maxjumpspeed)
 351                                 mjumpheight -= this.velocity_z - maxjumpspeed;
 352                 }
 353         }
 354
 355         if (!WAS_ONGROUND(this) && !WAS_ONSLICK(this))
 356         {
 357 #ifdef SVQC
 358                 if(autocvar_speedmeter)
 359                         LOG_TRACE("landing velocity: ", vtos(this.velocity), " (abs: ", ftos(vlen(this.velocity)), ")");
 360 #endif
 361                 if(this.lastground < time - 0.3)
 362                 {
 363                         float f = (1 - PHYS_FRICTION_ONLAND(this));
 364                         this.velocity_x *= f;
 365                         this.velocity_y *= f;
 366                 }
 367 #ifdef SVQC
 368                 if(this.jumppadcount > 1)
 369                         LOG_TRACE(ftos(this.jumppadcount), "x jumppad combo");
 370                 this.jumppadcount = 0;
 371 #endif
 372         }
 373
 374         this.velocity_z += mjumpheight;
 375
 376         UNSET_ONGROUND(this);
 377         UNSET_ONSLICK(this);
 378         SET_JUMP_HELD(this);
 379
 380 #ifdef SVQC
 381
 382         this.oldvelocity_z = this.velocity_z;
 383
 384         animdecide_setaction(this, ANIMACTION_JUMP, true);
 385
 386         if (autocvar_g_jump_grunt)
 387                 PlayerSound(this, playersound_jump, CH_PLAYER, VOL_BASE, VOICETYPE_PLAYERSOUND);
 388 #endif
 389         return true;
 390 }
 391
 392 void CheckWaterJump(entity this)
 393 {
 394 // check for a jump-out-of-water
 395         makevectors(this.v_angle);
 396         vector start = this.origin;
 397         start_z += 8;
 398         v_forward_z = 0;
 399         normalize(v_forward);
 400         vector end = start + v_forward*24;
 401         traceline (start, end, true, this);
 402         if (trace_fraction < 1)
 403         {       // solid at waist
 404                 start_z = start_z + this.maxs_z - 8;
 405                 end = start + v_forward*24;
 406                 this.movedir = trace_plane_normal * -50;
 407                 traceline(start, end, true, this);
 408                 if (trace_fraction == 1)
 409                 {       // open at eye level
 410                         this.velocity_z = 225;
 411                         this.flags |= FL_WATERJUMP;
 412                         SET_JUMP_HELD(this);
 413                 #ifdef SVQC
 414                         PHYS_TELEPORT_TIME(this) = time + 2;    // safety net
 415                 #elif defined(CSQC)
 416                         PHYS_WATERJUMP_TIME(this) = 2;
 417                 #endif
 418                 }
 419         }
 420 }
 421
 422
 423 #ifdef SVQC
 424         #define JETPACK_JUMP(s) s.cvar_cl_jetpack_jump
 425 #elif defined(CSQC)
 426         float autocvar_cl_jetpack_jump;
 427         #define JETPACK_JUMP(s) autocvar_cl_jetpack_jump
 428 #endif
 429 .float jetpack_stopped;
 430 void CheckPlayerJump(entity this)
 431 {
 432 #ifdef SVQC
 433         bool was_flying = boolean(ITEMS_STAT(this) & IT_USING_JETPACK);
 434 #endif
 435         if (JETPACK_JUMP(this) < 2)
 436                 ITEMS_STAT(this) &= ~IT_USING_JETPACK;
 437
 438         if(PHYS_INPUT_BUTTON_JUMP(this) || PHYS_INPUT_BUTTON_JETPACK(this))
 439         {
 440                 bool playerjump = PlayerJump(this); // required
 441
 442                 bool air_jump = !playerjump || M_ARGV(2, bool);
 443                 bool activate = JETPACK_JUMP(this) && air_jump && PHYS_INPUT_BUTTON_JUMP(this) || PHYS_INPUT_BUTTON_JETPACK(this);
 444                 bool has_fuel = !PHYS_JETPACK_FUEL(this) || PHYS_AMMO_FUEL(this) || (ITEMS_STAT(this) & IT_UNLIMITED_WEAPON_AMMO);
 445
 446                 if (!(ITEMS_STAT(this) & ITEM_Jetpack.m_itemid)) { }
 447                 else if (this.jetpack_stopped) { }
 448                 else if (!has_fuel)
 449                 {
 450 #ifdef SVQC
 451                         if (was_flying) // TODO: ran out of fuel message
 452                                 Send_Notification(NOTIF_ONE, this, MSG_INFO, INFO_JETPACK_NOFUEL);
 453                         else if (activate)
 454                                 Send_Notification(NOTIF_ONE, this, MSG_INFO, INFO_JETPACK_NOFUEL);
 455 #endif
 456                         this.jetpack_stopped = true;
 457                         ITEMS_STAT(this) &= ~IT_USING_JETPACK;
 458                 }
 459                 else if (activate && !PHYS_FROZEN(this))
 460                         ITEMS_STAT(this) |= IT_USING_JETPACK;
 461         }
 462         else
 463         {
 464                 this.jetpack_stopped = false;
 465                 ITEMS_STAT(this) &= ~IT_USING_JETPACK;
 466         }
 467         if (!PHYS_INPUT_BUTTON_JUMP(this))
 468                 UNSET_JUMP_HELD(this);
 469
 470         if (this.waterlevel == WATERLEVEL_SWIMMING)
 471                 CheckWaterJump(this);
 472 }
 473
 474 float racecar_angle(float forward, float down)
 475 {
 476         if (forward < 0)
 477         {
 478                 forward = -forward;
 479                 down = -down;
 480         }
 481
 482         float ret = vectoyaw('0 1 0' * down + '1 0 0' * forward);
 483
 484         float angle_mult = forward / (800 + forward);
 485
 486         if (ret > 180)
 487                 return ret * angle_mult + 360 * (1 - angle_mult);
 488         else
 489                 return ret * angle_mult;
 490 }
 491
 492 #ifdef SVQC
 493 string specialcommand = "xwxwxsxsxaxdxaxdx1x ";
 494 .float specialcommand_pos;
 495 void SpecialCommand(entity this)
 496 {
 497         if (!CheatImpulse(this, CHIMPULSE_GIVE_ALL.impulse))
 498                 LOG_INFO("A hollow voice says \"Plugh\".\n");
 499 }
 500 #endif
 501
 502 bool PM_check_specialcommand(entity this, int buttons)
 503 {
 504 #ifdef SVQC
 505         string c;
 506         if (!buttons)
 507                 c = "x";
 508         else if (buttons == 1)
 509                 c = "1";
 510         else if (buttons == 2)
 511                 c = " ";
 512         else if (buttons == 128)
 513                 c = "s";
 514         else if (buttons == 256)
 515                 c = "w";
 516         else if (buttons == 512)
 517                 c = "a";
 518         else if (buttons == 1024)
 519                 c = "d";
 520         else
 521                 c = "?";
 522
 523         if (c == substring(specialcommand, this.specialcommand_pos, 1))
 524         {
 525                 this.specialcommand_pos += 1;
 526                 if (this.specialcommand_pos >= strlen(specialcommand))
 527                 {
 528                         this.specialcommand_pos = 0;
 529                         SpecialCommand(this);
 530                         return true;
 531                 }
 532         }
 533         else if (this.specialcommand_pos && (c != substring(specialcommand, this.specialcommand_pos - 1, 1)))
 534                 this.specialcommand_pos = 0;
 535 #endif
 536         return false;
 537 }
 538
 539 void PM_check_nickspam(entity this)
 540 {
 541 #ifdef SVQC
 542         if (time >= this.nickspamtime)
 543                 return;
 544         if (this.nickspamcount >= autocvar_g_nick_flood_penalty_yellow)
 545         {
 546                 // slight annoyance for nick change scripts
 547                 this.movement = -1 * this.movement;
 548                 PHYS_INPUT_BUTTON_ATCK(this) = PHYS_INPUT_BUTTON_JUMP(this) = PHYS_INPUT_BUTTON_ATCK2(this) = PHYS_INPUT_BUTTON_ZOOM(this) = PHYS_INPUT_BUTTON_CROUCH(this) = PHYS_INPUT_BUTTON_HOOK(this) = PHYS_INPUT_BUTTON_USE(this) = false;
 549
 550                 if (this.nickspamcount >= autocvar_g_nick_flood_penalty_red) // if you are persistent and the slight annoyance above does not stop you, I'll show you!
 551                 {
 552                         this.v_angle_x = random() * 360;
 553                         this.v_angle_y = random() * 360;
 554                         // at least I'm not forcing retardedview by also assigning to angles_z
 555                         this.fixangle = true;
 556                 }
 557         }
 558 #endif
 559 }
 560
 561 void PM_check_punch(entity this, float dt)
 562 {
 563 #ifdef SVQC
 564         if (this.punchangle != '0 0 0')
 565         {
 566                 float f = vlen(this.punchangle) - 10 * dt;
 567                 if (f > 0)
 568                         this.punchangle = normalize(this.punchangle) * f;
 569                 else
 570                         this.punchangle = '0 0 0';
 571         }
 572
 573         if (this.punchvector != '0 0 0')
 574         {
 575                 float f = vlen(this.punchvector) - 30 * dt;
 576                 if (f > 0)
 577                         this.punchvector = normalize(this.punchvector) * f;
 578                 else
 579                         this.punchvector = '0 0 0';
 580         }
 581 #endif
 582 }
 583
 584 // predict frozen movement, as frozen players CAN move in some cases
 585 void PM_check_frozen(entity this)
 586 {
 587         if (!PHYS_FROZEN(this))
 588                 return;
 589         if (PHYS_DODGING_FROZEN(this)
 590 #ifdef SVQC
 591         && IS_REAL_CLIENT(this)
 592 #endif
 593         )
 594         {
 595                 this.movement_x = bound(-5, this.movement.x, 5);
 596                 this.movement_y = bound(-5, this.movement.y, 5);
 597                 this.movement_z = bound(-5, this.movement.z, 5);
 598         }
 599         else
 600                 this.movement = '0 0 0';
 601
 602         vector midpoint = ((this.absmin + this.absmax) * 0.5);
 603         if (pointcontents(midpoint) == CONTENT_WATER)
 604         {
 605                 this.velocity = this.velocity * 0.5;
 606
 607                 if (pointcontents(midpoint + '0 0 16') == CONTENT_WATER)
 608                         this.velocity_z = 200;
 609         }
 610 }
 611
 612 void PM_check_hitground(entity this)
 613 {
 614 #ifdef SVQC
 615         if (!this.wasFlying) return;
 616     this.wasFlying = false;
 617     if (this.waterlevel >= WATERLEVEL_SWIMMING) return;
 618     if (time < this.ladder_time) return;
 619     for(int slot = 0; slot < MAX_WEAPONSLOTS; ++slot)
 620     {
 621         .entity weaponentity = weaponentities[slot];
 622         if(this.(weaponentity).hook)
 623                 return;
 624     }
 625     this.nextstep = time + 0.3 + random() * 0.1;
 626     trace_dphitq3surfaceflags = 0;
 627     tracebox(this.origin, this.mins, this.maxs, this.origin - '0 0 1', MOVE_NOMONSTERS, this);
 628     if (trace_dphitq3surfaceflags & Q3SURFACEFLAG_NOSTEPS) return;
 629     entity gs = (trace_dphitq3surfaceflags & Q3SURFACEFLAG_METALSTEPS)
 630         ? GS_FALL_METAL
 631         : GS_FALL;
 632     float vol = ((IS_DUCKED(this)) ? VOL_MUFFLED : VOL_BASE);
 633     GlobalSound(this, gs, CH_PLAYER, vol, VOICETYPE_PLAYERSOUND);
 634 #endif
 635 }
 636
 637 void PM_Footsteps(entity this)
 638 {
 639 #ifdef SVQC
 640         if (!g_footsteps) return;
 641         if (IS_DUCKED(this)) return;
 642         if (time >= this.lastground + 0.2) return;
 643         if (vdist(this.velocity, <=, autocvar_sv_maxspeed * 0.6)) return;
 644         if ((time > this.nextstep) || (time < (this.nextstep - 10.0)))
 645         {
 646                 this.nextstep = time + 0.3 + random() * 0.1;
 647                 trace_dphitq3surfaceflags = 0;
 648                 tracebox(this.origin, this.mins, this.maxs, this.origin - '0 0 1', MOVE_NOMONSTERS, this);
 649                 if (trace_dphitq3surfaceflags & Q3SURFACEFLAG_NOSTEPS) return;
 650                 entity gs = (trace_dphitq3surfaceflags & Q3SURFACEFLAG_METALSTEPS)
 651                         ? GS_STEP_METAL
 652                         : GS_STEP;
 653                 GlobalSound(this, gs, CH_PLAYER, VOL_BASE, VOICETYPE_PLAYERSOUND);
 654         }
 655 #endif
 656 }
 657
 658 void PM_check_slick(entity this)
 659 {
 660         if(!IS_ONGROUND(this))
 661                 return;
 662
 663         if(!PHYS_SLICK_APPLYGRAVITY(this))
 664                 return;
 665
 666         tracebox(this.origin, this.mins, this.maxs, this.origin - '0 0 1', MOVE_NOMONSTERS, this);
 667         if (trace_dphitq3surfaceflags & Q3SURFACEFLAG_SLICK)
 668         {
 669                 UNSET_ONGROUND(this);
 670                 SET_ONSLICK(this);
 671         }
 672         else
 673                 UNSET_ONSLICK(this);
 674 }
 675
 676 void PM_check_blocked(entity this)
 677 {
 678 #ifdef SVQC
 679         if (!this.player_blocked)
 680                 return;
 681         this.movement = '0 0 0';
 682         this.disableclientprediction = 1;
 683 #endif
 684 }
 685
 686 void PM_jetpack(entity this, float maxspd_mod, float dt)
 687 {
 688         //makevectors(this.v_angle.y * '0 1 0');
 689         makevectors(this.v_angle);
 690         vector wishvel = v_forward * this.movement_x
 691                                         + v_right * this.movement_y;
 692         // add remaining speed as Z component
 693         float maxairspd = PHYS_MAXAIRSPEED(this) * max(1, maxspd_mod);
 694         // fix speedhacks :P
 695         wishvel = normalize(wishvel) * min(1, vlen(wishvel) / maxairspd);
 696         // add the unused velocity as up component
 697         wishvel_z = 0;
 698
 699         // if (PHYS_INPUT_BUTTON_JUMP(this))
 700                 wishvel_z = sqrt(max(0, 1 - wishvel * wishvel));
 701
 702         // it is now normalized, so...
 703         float a_side = PHYS_JETPACK_ACCEL_SIDE(this);
 704         float a_up = PHYS_JETPACK_ACCEL_UP(this);
 705         float a_add = PHYS_JETPACK_ANTIGRAVITY(this) * PHYS_GRAVITY(this);
 706
 707         if(PHYS_JETPACK_REVERSE_THRUST(this) && PHYS_INPUT_BUTTON_CROUCH(self)) { a_up = PHYS_JETPACK_REVERSE_THRUST(this); }
 708
 709         wishvel_x *= a_side;
 710         wishvel_y *= a_side;
 711         wishvel_z *= a_up;
 712         wishvel_z += a_add;
 713
 714         if(PHYS_JETPACK_REVERSE_THRUST(this) && PHYS_INPUT_BUTTON_CROUCH(self)) { wishvel_z *= -1; }
 715
 716         float best = 0;
 717         //////////////////////////////////////////////////////////////////////////////////////
 718         // finding the maximum over all vectors of above form
 719         // with wishvel having an absolute value of 1
 720         //////////////////////////////////////////////////////////////////////////////////////
 721         // we're finding the maximum over
 722         //   f(a_side, a_up, a_add, z) := a_side * (1 - z^2) + (a_add + a_up * z)^2;
 723         // for z in the range from -1 to 1
 724         //////////////////////////////////////////////////////////////////////////////////////
 725         // maximum is EITHER attained at the single extreme point:
 726         float a_diff = a_side * a_side - a_up * a_up;
 727         float f;
 728         if (a_diff != 0)
 729         {
 730                 f = a_add * a_up / a_diff; // this is the zero of diff(f(a_side, a_up, a_add, z), z)
 731                 if (f > -1 && f < 1) // can it be attained?
 732                 {
 733                         best = (a_diff + a_add * a_add) * (a_diff + a_up * a_up) / a_diff;
 734                         //print("middle\n");
 735                 }
 736         }
 737         // OR attained at z = 1:
 738         f = (a_up + a_add) * (a_up + a_add);
 739         if (f > best)
 740         {
 741                 best = f;
 742                 //print("top\n");
 743         }
 744         // OR attained at z = -1:
 745         f = (a_up - a_add) * (a_up - a_add);
 746         if (f > best)
 747         {
 748                 best = f;
 749                 //print("bottom\n");
 750         }
 751         best = sqrt(best);
 752         //////////////////////////////////////////////////////////////////////////////////////
 753
 754         //print("best possible acceleration: ", ftos(best), "\n");
 755
 756         float fxy, fz;
 757         fxy = bound(0, 1 - (this.velocity * normalize(wishvel_x * '1 0 0' + wishvel_y * '0 1 0')) / PHYS_JETPACK_MAXSPEED_SIDE(this), 1);
 758         if (wishvel_z - PHYS_GRAVITY(this) > 0)
 759                 fz = bound(0, 1 - this.velocity_z / PHYS_JETPACK_MAXSPEED_UP(this), 1);
 760         else
 761                 fz = bound(0, 1 + this.velocity_z / PHYS_JETPACK_MAXSPEED_UP(this), 1);
 762
 763         float fvel;
 764         fvel = vlen(wishvel);
 765         wishvel_x *= fxy;
 766         wishvel_y *= fxy;
 767         wishvel_z = (wishvel_z - PHYS_GRAVITY(this)) * fz + PHYS_GRAVITY(this);
 768
 769         fvel = min(1, vlen(wishvel) / best);
 770         if (PHYS_JETPACK_FUEL(this) && !(ITEMS_STAT(this) & IT_UNLIMITED_WEAPON_AMMO))
 771                 f = min(1, PHYS_AMMO_FUEL(this) / (PHYS_JETPACK_FUEL(this) * dt * fvel));
 772         else
 773                 f = 1;
 774
 775         //print("this acceleration: ", ftos(vlen(wishvel) * f), "\n");
 776
 777         if (f > 0 && wishvel != '0 0 0')
 778         {
 779                 this.velocity = this.velocity + wishvel * f * dt;
 780                 UNSET_ONGROUND(this);
 781
 782 #ifdef SVQC
 783                 if (!(ITEMS_STAT(this) & IT_UNLIMITED_WEAPON_AMMO))
 784                         this.ammo_fuel -= PHYS_JETPACK_FUEL(this) * dt * fvel * f;
 785
 786                 ITEMS_STAT(this) |= IT_USING_JETPACK;
 787
 788                 // jetpack also inhibits health regeneration, but only for 1 second
 789                 this.pauseregen_finished = max(this.pauseregen_finished, time + autocvar_g_balance_pause_fuel_regen);
 790 #endif
 791         }
 792 }
 793
 794 // used for calculating airshots
 795 bool IsFlying(entity this)
 796 {
 797         if(IS_ONGROUND(this))
 798                 return false;
 799         if(this.waterlevel >= WATERLEVEL_SWIMMING)
 800                 return false;
 801         traceline(this.origin, this.origin - '0 0 48', MOVE_NORMAL, this);
 802         if(trace_fraction < 1)
 803                 return false;
 804         return true;
 805 }
 806
 807
 808 void sys_phys_update(entity this, float dt);
 809 #if defined(SVQC)
 810 void SV_PlayerPhysics(entity this)
 811 #elif defined(CSQC)
 812 void CSQC_ClientMovement_PlayerMove_Frame(entity this)
 813 #endif
 814 {
 815         sys_phys_update(this, PHYS_INPUT_TIMELENGTH);
 816
 817 #ifdef SVQC
 818         this.pm_frametime = frametime;
 819 #elif defined(CSQC)
 820         if((ITEMS_STAT(this) & IT_USING_JETPACK) && !IS_DEAD(this) && !intermission)
 821                 this.csqcmodel_modelflags |= MF_ROCKET;
 822         else
 823                 this.csqcmodel_modelflags &= ~MF_ROCKET;
 824 #endif
 825 }