sv_user.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // sv_user.c -- server code for moving users
  21
  22 #include "quakedef.h"
  23 #include "sv_demo.h"
  24 #define DEBUGMOVES 0
  25
  26 static usercmd_t cmd;
  27 extern cvar_t sv_autodemo_perclient;
  28
  29 /*
  30 ===============
  31 SV_SetIdealPitch
  32 ===============
  33 */
  34 #define MAX_FORWARD     6
  35 void SV_SetIdealPitch (void)
  36 {
  37         float   angleval, sinval, cosval, step, dir;
  38         trace_t tr;
  39         vec3_t  top, bottom;
  40         float   z[MAX_FORWARD];
  41         int             i, j;
  42         int             steps;
  43
  44         if (!((int)host_client->edict->fields.server->flags & FL_ONGROUND))
  45                 return;
  46
  47         angleval = host_client->edict->fields.server->angles[YAW] * M_PI*2 / 360;
  48         sinval = sin(angleval);
  49         cosval = cos(angleval);
  50
  51         for (i=0 ; i<MAX_FORWARD ; i++)
  52         {
  53                 top[0] = host_client->edict->fields.server->origin[0] + cosval*(i+3)*12;
  54                 top[1] = host_client->edict->fields.server->origin[1] + sinval*(i+3)*12;
  55                 top[2] = host_client->edict->fields.server->origin[2] + host_client->edict->fields.server->view_ofs[2];
  56
  57                 bottom[0] = top[0];
  58                 bottom[1] = top[1];
  59                 bottom[2] = top[2] - 160;
  60
  61                 tr = SV_TraceLine(top, bottom, MOVE_NOMONSTERS, host_client->edict, SUPERCONTENTS_SOLID);
  62                 // if looking at a wall, leave ideal the way is was
  63                 if (tr.startsolid)
  64                         return;
  65
  66                 // near a dropoff
  67                 if (tr.fraction == 1)
  68                         return;
  69
  70                 z[i] = top[2] + tr.fraction*(bottom[2]-top[2]);
  71         }
  72
  73         dir = 0;
  74         steps = 0;
  75         for (j=1 ; j<i ; j++)
  76         {
  77                 step = z[j] - z[j-1];
  78                 if (step > -ON_EPSILON && step < ON_EPSILON)
  79                         continue;
  80
  81                 // mixed changes
  82                 if (dir && ( step-dir > ON_EPSILON || step-dir < -ON_EPSILON ) )
  83                         return;
  84
  85                 steps++;
  86                 dir = step;
  87         }
  88
  89         if (!dir)
  90         {
  91                 host_client->edict->fields.server->idealpitch = 0;
  92                 return;
  93         }
  94
  95         if (steps < 2)
  96                 return;
  97         host_client->edict->fields.server->idealpitch = -dir * sv_idealpitchscale.value;
  98 }
  99
 100 static vec3_t wishdir, forward, right, up;
 101 static float wishspeed;
 102
 103 static qboolean onground;
 104
 105 /*
 106 ==================
 107 SV_UserFriction
 108
 109 ==================
 110 */
 111 void SV_UserFriction (void)
 112 {
 113         float speed, newspeed, control, friction;
 114         vec3_t start, stop;
 115         trace_t trace;
 116
 117         speed = sqrt(host_client->edict->fields.server->velocity[0]*host_client->edict->fields.server->velocity[0]+host_client->edict->fields.server->velocity[1]*host_client->edict->fields.server->velocity[1]);
 118         if (!speed)
 119                 return;
 120
 121         // if the leading edge is over a dropoff, increase friction
 122         start[0] = stop[0] = host_client->edict->fields.server->origin[0] + host_client->edict->fields.server->velocity[0]/speed*16;
 123         start[1] = stop[1] = host_client->edict->fields.server->origin[1] + host_client->edict->fields.server->velocity[1]/speed*16;
 124         start[2] = host_client->edict->fields.server->origin[2] + host_client->edict->fields.server->mins[2];
 125         stop[2] = start[2] - 34;
 126
 127         trace = SV_TraceLine(start, stop, MOVE_NOMONSTERS, host_client->edict, SV_GenericHitSuperContentsMask(host_client->edict));
 128
 129         if (trace.fraction == 1.0)
 130                 friction = sv_friction.value*sv_edgefriction.value;
 131         else
 132                 friction = sv_friction.value;
 133
 134         // apply friction
 135         control = speed < sv_stopspeed.value ? sv_stopspeed.value : speed;
 136         newspeed = speed - sv.frametime*control*friction;
 137
 138         if (newspeed < 0)
 139                 newspeed = 0;
 140         else
 141                 newspeed /= speed;
 142
 143         VectorScale(host_client->edict->fields.server->velocity, newspeed, host_client->edict->fields.server->velocity);
 144 }
 145
 146 /*
 147 ==============
 148 SV_Accelerate
 149 ==============
 150 */
 151 void SV_Accelerate (void)
 152 {
 153         int i;
 154         float addspeed, accelspeed, currentspeed;
 155
 156         currentspeed = DotProduct (host_client->edict->fields.server->velocity, wishdir);
 157         addspeed = wishspeed - currentspeed;
 158         if (addspeed <= 0)
 159                 return;
 160         accelspeed = sv_accelerate.value*sv.frametime*wishspeed;
 161         if (accelspeed > addspeed)
 162                 accelspeed = addspeed;
 163
 164         for (i=0 ; i<3 ; i++)
 165                 host_client->edict->fields.server->velocity[i] += accelspeed*wishdir[i];
 166 }
 167
 168 extern cvar_t sv_gameplayfix_q2airaccelerate;
 169 void SV_AirAccelerate (vec3_t wishveloc)
 170 {
 171         int i;
 172         float addspeed, wishspd, accelspeed, currentspeed;
 173
 174         wishspd = VectorNormalizeLength (wishveloc);
 175         if (wishspd > sv_maxairspeed.value)
 176                 wishspd = sv_maxairspeed.value;
 177         currentspeed = DotProduct (host_client->edict->fields.server->velocity, wishveloc);
 178         addspeed = wishspd - currentspeed;
 179         if (addspeed <= 0)
 180                 return;
 181         accelspeed = (sv_airaccelerate.value < 0 ? sv_accelerate.value : sv_airaccelerate.value)*(sv_gameplayfix_q2airaccelerate.integer ? wishspd : wishspeed) * sv.frametime;
 182         if (accelspeed > addspeed)
 183                 accelspeed = addspeed;
 184
 185         for (i=0 ; i<3 ; i++)
 186                 host_client->edict->fields.server->velocity[i] += accelspeed*wishveloc[i];
 187 }
 188
 189
 190 void DropPunchAngle (void)
 191 {
 192         float len;
 193         prvm_eval_t *val;
 194
 195         len = VectorNormalizeLength (host_client->edict->fields.server->punchangle);
 196
 197         len -= 10*sv.frametime;
 198         if (len < 0)
 199                 len = 0;
 200         VectorScale (host_client->edict->fields.server->punchangle, len, host_client->edict->fields.server->punchangle);
 201
 202         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.punchvector)))
 203         {
 204                 len = VectorNormalizeLength (val->vector);
 205
 206                 len -= 20*sv.frametime;
 207                 if (len < 0)
 208                         len = 0;
 209                 VectorScale (val->vector, len, val->vector);
 210         }
 211 }
 212
 213 /*
 214 ===================
 215 SV_FreeMove
 216 ===================
 217 */
 218 void SV_FreeMove (void)
 219 {
 220         int i;
 221         float wishspeed;
 222
 223         AngleVectors (host_client->edict->fields.server->v_angle, forward, right, up);
 224
 225         for (i = 0; i < 3; i++)
 226                 host_client->edict->fields.server->velocity[i] = forward[i] * cmd.forwardmove + right[i] * cmd.sidemove;
 227
 228         host_client->edict->fields.server->velocity[2] += cmd.upmove;
 229
 230         wishspeed = VectorLength(host_client->edict->fields.server->velocity);
 231         if (wishspeed > sv_maxspeed.value)
 232                 VectorScale(host_client->edict->fields.server->velocity, sv_maxspeed.value / wishspeed, host_client->edict->fields.server->velocity);
 233 }
 234
 235 /*
 236 ===================
 237 SV_WaterMove
 238
 239 ===================
 240 */
 241 void SV_WaterMove (void)
 242 {
 243         int i;
 244         vec3_t wishvel;
 245         float speed, newspeed, wishspeed, addspeed, accelspeed, temp;
 246
 247         // user intentions
 248         AngleVectors (host_client->edict->fields.server->v_angle, forward, right, up);
 249
 250         for (i=0 ; i<3 ; i++)
 251                 wishvel[i] = forward[i]*cmd.forwardmove + right[i]*cmd.sidemove;
 252
 253         if (!cmd.forwardmove && !cmd.sidemove && !cmd.upmove)
 254                 wishvel[2] -= 60;               // drift towards bottom
 255         else
 256                 wishvel[2] += cmd.upmove;
 257
 258         wishspeed = VectorLength(wishvel);
 259         if (wishspeed > sv_maxspeed.value)
 260         {
 261                 temp = sv_maxspeed.value/wishspeed;
 262                 VectorScale (wishvel, temp, wishvel);
 263                 wishspeed = sv_maxspeed.value;
 264         }
 265         wishspeed *= 0.7;
 266
 267         // water friction
 268         speed = VectorLength(host_client->edict->fields.server->velocity);
 269         if (speed)
 270         {
 271                 newspeed = speed - sv.frametime * speed * (sv_waterfriction.value < 0 ? sv_friction.value : sv_waterfriction.value);
 272                 if (newspeed < 0)
 273                         newspeed = 0;
 274                 temp = newspeed/speed;
 275                 VectorScale(host_client->edict->fields.server->velocity, temp, host_client->edict->fields.server->velocity);
 276         }
 277         else
 278                 newspeed = 0;
 279
 280         // water acceleration
 281         if (!wishspeed)
 282                 return;
 283
 284         addspeed = wishspeed - newspeed;
 285         if (addspeed <= 0)
 286                 return;
 287
 288         VectorNormalize (wishvel);
 289         accelspeed = (sv_wateraccelerate.value < 0 ? sv_accelerate.value : sv_wateraccelerate.value) * wishspeed * sv.frametime;
 290         if (accelspeed > addspeed)
 291                 accelspeed = addspeed;
 292
 293         for (i=0 ; i<3 ; i++)
 294                 host_client->edict->fields.server->velocity[i] += accelspeed * wishvel[i];
 295 }
 296
 297 void SV_WaterJump (void)
 298 {
 299         if (sv.time > host_client->edict->fields.server->teleport_time || !host_client->edict->fields.server->waterlevel)
 300         {
 301                 host_client->edict->fields.server->flags = (int)host_client->edict->fields.server->flags & ~FL_WATERJUMP;
 302                 host_client->edict->fields.server->teleport_time = 0;
 303         }
 304         host_client->edict->fields.server->velocity[0] = host_client->edict->fields.server->movedir[0];
 305         host_client->edict->fields.server->velocity[1] = host_client->edict->fields.server->movedir[1];
 306 }
 307
 308
 309 /*
 310 ===================
 311 SV_AirMove
 312
 313 ===================
 314 */
 315 void SV_AirMove (void)
 316 {
 317         int i;
 318         vec3_t wishvel;
 319         float fmove, smove, temp;
 320
 321         // LordHavoc: correct quake movement speed bug when looking up/down
 322         wishvel[0] = wishvel[2] = 0;
 323         wishvel[1] = host_client->edict->fields.server->angles[1];
 324         AngleVectors (wishvel, forward, right, up);
 325
 326         fmove = cmd.forwardmove;
 327         smove = cmd.sidemove;
 328
 329 // hack to not let you back into teleporter
 330         if (sv.time < host_client->edict->fields.server->teleport_time && fmove < 0)
 331                 fmove = 0;
 332
 333         for (i=0 ; i<3 ; i++)
 334                 wishvel[i] = forward[i]*fmove + right[i]*smove;
 335
 336         if ((int)host_client->edict->fields.server->movetype != MOVETYPE_WALK)
 337                 wishvel[2] += cmd.upmove;
 338
 339         VectorCopy (wishvel, wishdir);
 340         wishspeed = VectorNormalizeLength(wishdir);
 341         if (wishspeed > sv_maxspeed.value)
 342         {
 343                 temp = sv_maxspeed.value/wishspeed;
 344                 VectorScale (wishvel, temp, wishvel);
 345                 wishspeed = sv_maxspeed.value;
 346         }
 347
 348         if (host_client->edict->fields.server->movetype == MOVETYPE_NOCLIP)
 349         {
 350                 // noclip
 351                 VectorCopy (wishvel, host_client->edict->fields.server->velocity);
 352         }
 353         else if (onground)
 354         {
 355                 SV_UserFriction ();
 356                 SV_Accelerate ();
 357         }
 358         else
 359         {
 360                 // not on ground, so little effect on velocity
 361                 SV_AirAccelerate (wishvel);
 362         }
 363 }
 364
 365 /*
 366 ===================
 367 SV_ClientThink
 368
 369 the move fields specify an intended velocity in pix/sec
 370 the angle fields specify an exact angular motion in degrees
 371 ===================
 372 */
 373 void SV_ClientThink (void)
 374 {
 375         vec3_t v_angle;
 376
 377         //Con_Printf("clientthink for %ims\n", (int) (sv.frametime * 1000));
 378
 379         SV_ApplyClientMove();
 380         // make sure the velocity is sane (not a NaN)
 381         SV_CheckVelocity(host_client->edict);
 382
 383         // LordHavoc: QuakeC replacement for SV_ClientThink (player movement)
 384         if (prog->funcoffsets.SV_PlayerPhysics && sv_playerphysicsqc.integer)
 385         {
 386                 prog->globals.server->time = sv.time;
 387                 prog->globals.server->self = PRVM_EDICT_TO_PROG(host_client->edict);
 388                 PRVM_ExecuteProgram (prog->funcoffsets.SV_PlayerPhysics, "QC function SV_PlayerPhysics is missing");
 389                 SV_CheckVelocity(host_client->edict);
 390                 return;
 391         }
 392
 393         if (host_client->edict->fields.server->movetype == MOVETYPE_NONE)
 394                 return;
 395
 396         onground = ((int)host_client->edict->fields.server->flags & FL_ONGROUND) != 0;
 397
 398         DropPunchAngle ();
 399
 400         // if dead, behave differently
 401         if (host_client->edict->fields.server->health <= 0)
 402                 return;
 403
 404         cmd = host_client->cmd;
 405
 406         // angles
 407         // show 1/3 the pitch angle and all the roll angle
 408         VectorAdd (host_client->edict->fields.server->v_angle, host_client->edict->fields.server->punchangle, v_angle);
 409         host_client->edict->fields.server->angles[ROLL] = V_CalcRoll (host_client->edict->fields.server->angles, host_client->edict->fields.server->velocity)*4;
 410         if (!host_client->edict->fields.server->fixangle)
 411         {
 412                 host_client->edict->fields.server->angles[PITCH] = -v_angle[PITCH]/3;
 413                 host_client->edict->fields.server->angles[YAW] = v_angle[YAW];
 414         }
 415
 416         if ( (int)host_client->edict->fields.server->flags & FL_WATERJUMP )
 417         {
 418                 SV_WaterJump ();
 419                 SV_CheckVelocity(host_client->edict);
 420                 return;
 421         }
 422
 423         /*
 424         // Player is (somehow) outside of the map, or flying, or noclipping
 425         if (host_client->edict->fields.server->movetype != MOVETYPE_NOCLIP && (host_client->edict->fields.server->movetype == MOVETYPE_FLY || SV_TestEntityPosition (host_client->edict)))
 426         //if (host_client->edict->fields.server->movetype == MOVETYPE_NOCLIP || host_client->edict->fields.server->movetype == MOVETYPE_FLY || SV_TestEntityPosition (host_client->edict))
 427         {
 428                 SV_FreeMove ();
 429                 return;
 430         }
 431         */
 432
 433         // walk
 434         if ((host_client->edict->fields.server->waterlevel >= 2) && (host_client->edict->fields.server->movetype != MOVETYPE_NOCLIP))
 435         {
 436                 SV_WaterMove ();
 437                 SV_CheckVelocity(host_client->edict);
 438                 return;
 439         }
 440
 441         SV_AirMove ();
 442         SV_CheckVelocity(host_client->edict);
 443 }
 444
 445 /*
 446 ===================
 447 SV_ReadClientMove
 448 ===================
 449 */
 450 int sv_numreadmoves = 0;
 451 usercmd_t sv_readmoves[CL_MAX_USERCMDS];
 452 void SV_ReadClientMove (void)
 453 {
 454         int i;
 455         usercmd_t newmove;
 456         usercmd_t *move = &newmove;
 457
 458         memset(move, 0, sizeof(*move));
 459
 460         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 461
 462         // read ping time
 463         if (sv.protocol != PROTOCOL_QUAKE && sv.protocol != PROTOCOL_QUAKEDP && sv.protocol != PROTOCOL_NEHAHRAMOVIE && sv.protocol != PROTOCOL_NEHAHRABJP && sv.protocol != PROTOCOL_NEHAHRABJP2 && sv.protocol != PROTOCOL_NEHAHRABJP3 && sv.protocol != PROTOCOL_DARKPLACES1 && sv.protocol != PROTOCOL_DARKPLACES2 && sv.protocol != PROTOCOL_DARKPLACES3 && sv.protocol != PROTOCOL_DARKPLACES4 && sv.protocol != PROTOCOL_DARKPLACES5 && sv.protocol != PROTOCOL_DARKPLACES6)
 464                 move->sequence = MSG_ReadLong ();
 465         move->time = move->clienttime = MSG_ReadFloat ();
 466         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 467         move->receivetime = (float)sv.time;
 468
 469 #if DEBUGMOVES
 470         Con_Printf("%s move%i #%i %ims (%ims) %i %i '%i %i %i' '%i %i %i'\n", move->time > move->receivetime ? "^3read future" : "^4read normal", sv_numreadmoves + 1, move->sequence, (int)floor((move->time - host_client->cmd.time) * 1000.0 + 0.5), (int)floor(move->time * 1000.0 + 0.5), move->impulse, move->buttons, (int)move->viewangles[0], (int)move->viewangles[1], (int)move->viewangles[2], (int)move->forwardmove, (int)move->sidemove, (int)move->upmove);
 471 #endif
 472         // limit reported time to current time
 473         // (incase the client is trying to cheat)
 474         move->time = min(move->time, move->receivetime + sv.frametime);
 475
 476         // read current angles
 477         for (i = 0;i < 3;i++)
 478         {
 479                 if (sv.protocol == PROTOCOL_QUAKE || sv.protocol == PROTOCOL_QUAKEDP || sv.protocol == PROTOCOL_NEHAHRAMOVIE || sv.protocol == PROTOCOL_NEHAHRABJP || sv.protocol == PROTOCOL_NEHAHRABJP2 || sv.protocol == PROTOCOL_NEHAHRABJP3)
 480                         move->viewangles[i] = MSG_ReadAngle8i();
 481                 else if (sv.protocol == PROTOCOL_DARKPLACES1)
 482                         move->viewangles[i] = MSG_ReadAngle16i();
 483                 else if (sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3)
 484                         move->viewangles[i] = MSG_ReadAngle32f();
 485                 else
 486                         move->viewangles[i] = MSG_ReadAngle16i();
 487         }
 488         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 489
 490         // read movement
 491         move->forwardmove = MSG_ReadCoord16i ();
 492         move->sidemove = MSG_ReadCoord16i ();
 493         move->upmove = MSG_ReadCoord16i ();
 494         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 495
 496         // read buttons
 497         // be sure to bitwise OR them into the move->buttons because we want to
 498         // accumulate button presses from multiple packets per actual move
 499         if (sv.protocol == PROTOCOL_QUAKE || sv.protocol == PROTOCOL_QUAKEDP || sv.protocol == PROTOCOL_NEHAHRAMOVIE || sv.protocol == PROTOCOL_NEHAHRABJP || sv.protocol == PROTOCOL_NEHAHRABJP2 || sv.protocol == PROTOCOL_NEHAHRABJP3 || sv.protocol == PROTOCOL_DARKPLACES1 || sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3 || sv.protocol == PROTOCOL_DARKPLACES4 || sv.protocol == PROTOCOL_DARKPLACES5)
 500                 move->buttons = MSG_ReadByte ();
 501         else
 502                 move->buttons = MSG_ReadLong ();
 503         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 504
 505         // read impulse
 506         move->impulse = MSG_ReadByte ();
 507         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 508
 509         // PRYDON_CLIENTCURSOR
 510         if (sv.protocol != PROTOCOL_QUAKE && sv.protocol != PROTOCOL_QUAKEDP && sv.protocol != PROTOCOL_NEHAHRAMOVIE && sv.protocol != PROTOCOL_NEHAHRABJP && sv.protocol != PROTOCOL_NEHAHRABJP2 && sv.protocol != PROTOCOL_NEHAHRABJP3 && sv.protocol != PROTOCOL_DARKPLACES1 && sv.protocol != PROTOCOL_DARKPLACES2 && sv.protocol != PROTOCOL_DARKPLACES3 && sv.protocol != PROTOCOL_DARKPLACES4 && sv.protocol != PROTOCOL_DARKPLACES5)
 511         {
 512                 // 30 bytes
 513                 move->cursor_screen[0] = MSG_ReadShort() * (1.0f / 32767.0f);
 514                 move->cursor_screen[1] = MSG_ReadShort() * (1.0f / 32767.0f);
 515                 move->cursor_start[0] = MSG_ReadFloat();
 516                 move->cursor_start[1] = MSG_ReadFloat();
 517                 move->cursor_start[2] = MSG_ReadFloat();
 518                 move->cursor_impact[0] = MSG_ReadFloat();
 519                 move->cursor_impact[1] = MSG_ReadFloat();
 520                 move->cursor_impact[2] = MSG_ReadFloat();
 521                 move->cursor_entitynumber = (unsigned short)MSG_ReadShort();
 522                 if (move->cursor_entitynumber >= prog->max_edicts)
 523                 {
 524                         Con_DPrintf("SV_ReadClientMessage: client send bad cursor_entitynumber\n");
 525                         move->cursor_entitynumber = 0;
 526                 }
 527                 // as requested by FrikaC, cursor_trace_ent is reset to world if the
 528                 // entity is free at time of receipt
 529                 if (PRVM_EDICT_NUM(move->cursor_entitynumber)->priv.server->free)
 530                         move->cursor_entitynumber = 0;
 531                 if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 532         }
 533
 534         // if the previous move has not been applied yet, we need to accumulate
 535         // the impulse/buttons from it
 536         if (!host_client->cmd.applied)
 537         {
 538                 if (!move->impulse)
 539                         move->impulse = host_client->cmd.impulse;
 540                 move->buttons |= host_client->cmd.buttons;
 541         }
 542
 543         // now store this move for later execution
 544         // (we have to buffer the moves because of old ones being repeated)
 545         if (sv_numreadmoves < CL_MAX_USERCMDS)
 546                 sv_readmoves[sv_numreadmoves++] = *move;
 547 }
 548
 549 void SV_ExecuteClientMoves(void)
 550 {
 551         int moveindex;
 552         float moveframetime;
 553         double oldframetime;
 554         double oldframetime2;
 555 #ifdef NUM_PING_TIMES
 556         double total;
 557 #endif
 558         prvm_eval_t *val;
 559         if (sv_numreadmoves < 1)
 560                 return;
 561         // only start accepting input once the player is spawned
 562         if (!host_client->spawned)
 563                 return;
 564 #if DEBUGMOVES
 565         Con_Printf("SV_ExecuteClientMoves: read %i moves at sv.time %f\n", sv_numreadmoves, (float)sv.time);
 566 #endif
 567         // disable clientside movement prediction in some cases
 568         if (ceil(max(sv_readmoves[sv_numreadmoves-1].receivetime - sv_readmoves[sv_numreadmoves-1].time, 0) * 1000.0) < sv_clmovement_minping.integer)
 569                 host_client->clmovement_disabletimeout = realtime + sv_clmovement_minping_disabletime.value / 1000.0;
 570         // several conditions govern whether clientside movement prediction is allowed
 571         if (sv_readmoves[sv_numreadmoves-1].sequence && sv_clmovement_enable.integer && sv_clmovement_inputtimeout.value > 0 && host_client->clmovement_disabletimeout <= realtime && host_client->edict->fields.server->movetype == MOVETYPE_WALK && (!(val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.disableclientprediction)) || !val->_float))
 572         {
 573                 // process the moves in order and ignore old ones
 574                 // but always trust the latest move
 575                 // (this deals with bogus initial move sequences after level change,
 576                 //  where the client will eventually catch up with the level change
 577                 //  and reset its move sequence)
 578                 for (moveindex = 0;moveindex < sv_numreadmoves;moveindex++)
 579                 {
 580                         usercmd_t *move = sv_readmoves + moveindex;
 581                         if (host_client->movesequence < move->sequence || moveindex == sv_numreadmoves - 1)
 582                         {
 583 #if DEBUGMOVES
 584                                 Con_Printf("%smove #%i %ims (%ims) %i %i '%i %i %i' '%i %i %i'\n", (move->time - host_client->cmd.time) > sv.frametime * 1.01 ? "^1" : "^2", move->sequence, (int)floor((move->time - host_client->cmd.time) * 1000.0 + 0.5), (int)floor(move->time * 1000.0 + 0.5), move->impulse, move->buttons, (int)move->viewangles[0], (int)move->viewangles[1], (int)move->viewangles[2], (int)move->forwardmove, (int)move->sidemove, (int)move->upmove);
 585 #endif
 586                                 // this is a new move
 587                                 move->time = bound(sv.time - 1, move->time, sv.time); // prevent slowhack/speedhack combos
 588                                 move->time = max(move->time, host_client->cmd.time); // prevent backstepping of time
 589                                 moveframetime = bound(0, move->time - host_client->cmd.time, min(0.1, sv_clmovement_inputtimeout.value));
 590
 591                                 // discard (treat like lost) moves with too low distance from
 592                                 // the previous one to prevent hacks using float inaccuracy
 593                                 // clients will see this as packet loss in the netgraph
 594                                 if(moveframetime < 0.0005)
 595                                         continue;
 596
 597                                 //Con_Printf("movesequence = %i (%i lost), moveframetime = %f\n", move->sequence, move->sequence ? move->sequence - host_client->movesequence - 1 : 0, moveframetime);
 598                                 host_client->cmd = *move;
 599                                 host_client->movesequence = move->sequence;
 600
 601                                 // if using prediction, we need to perform moves when packets are
 602                                 // received, even if multiple occur in one frame
 603                                 // (they can't go beyond the current time so there is no cheat issue
 604                                 //  with this approach, and if they don't send input for a while they
 605                                 //  start moving anyway, so the longest 'lagaport' possible is
 606                                 //  determined by the sv_clmovement_inputtimeout cvar)
 607                                 if (moveframetime <= 0)
 608                                         continue;
 609                                 oldframetime = prog->globals.server->frametime;
 610                                 oldframetime2 = sv.frametime;
 611                                 // update ping time for qc to see while executing this move
 612                                 host_client->ping = host_client->cmd.receivetime - host_client->cmd.time;
 613                                 // the server and qc frametime values must be changed temporarily
 614                                 prog->globals.server->frametime = sv.frametime = moveframetime;
 615                                 // if move is more than 50ms, split it into two moves (this matches QWSV behavior and the client prediction)
 616                                 if (sv.frametime > 0.05)
 617                                 {
 618                                         prog->globals.server->frametime = sv.frametime = moveframetime * 0.5f;
 619                                         SV_Physics_ClientMove();
 620                                 }
 621                                 SV_Physics_ClientMove();
 622                                 sv.frametime = oldframetime2;
 623                                 prog->globals.server->frametime = oldframetime;
 624                                 host_client->clmovement_inputtimeout = sv_clmovement_inputtimeout.value;
 625                         }
 626                 }
 627         }
 628         else
 629         {
 630                 // try to gather button bits from old moves, but only if their time is
 631                 // advancing (ones with the same timestamp can't be trusted)
 632                 for (moveindex = 0;moveindex < sv_numreadmoves-1;moveindex++)
 633                 {
 634                         usercmd_t *move = sv_readmoves + moveindex;
 635                         if (host_client->cmd.time < move->time)
 636                         {
 637                                 sv_readmoves[sv_numreadmoves-1].buttons |= move->buttons;
 638                                 if (move->impulse)
 639                                         sv_readmoves[sv_numreadmoves-1].impulse = move->impulse;
 640                         }
 641                 }
 642                 // now copy the new move
 643                 host_client->cmd = sv_readmoves[sv_numreadmoves-1];
 644                 host_client->cmd.time = max(host_client->cmd.time, sv.time);
 645                         // physics will run up to sv.time, so allow no predicted moves
 646                         // before that otherwise, there is a speedhack by turning
 647                         // prediction on and off repeatedly on client side because the
 648                         // engine would run BOTH client and server physics for the same
 649                         // time
 650                 host_client->movesequence = 0;
 651                 // make sure that normal physics takes over immediately
 652                 host_client->clmovement_inputtimeout = 0;
 653         }
 654
 655         // calculate average ping time
 656         host_client->ping = host_client->cmd.receivetime - host_client->cmd.clienttime;
 657 #ifdef NUM_PING_TIMES
 658         host_client->ping_times[host_client->num_pings % NUM_PING_TIMES] = host_client->cmd.receivetime - host_client->cmd.clienttime;
 659         host_client->num_pings++;
 660         for (i=0, total = 0;i < NUM_PING_TIMES;i++)
 661                 total += host_client->ping_times[i];
 662         host_client->ping = total / NUM_PING_TIMES;
 663 #endif
 664 }
 665
 666 void SV_ApplyClientMove (void)
 667 {
 668         prvm_eval_t *val;
 669         usercmd_t *move = &host_client->cmd;
 670
 671         if (!move->receivetime)
 672                 return;
 673
 674         // note: a move can be applied multiple times if the client packets are
 675         // not coming as often as the physics is executed, and the move must be
 676         // applied before running qc each time because the id1 qc had a bug where
 677         // it clears self.button2 in PlayerJump, causing pogostick behavior if
 678         // moves are not applied every time before calling qc
 679         move->applied = true;
 680
 681         // set the edict fields
 682         host_client->edict->fields.server->button0 = move->buttons & 1;
 683         host_client->edict->fields.server->button2 = (move->buttons & 2)>>1;
 684         if (move->impulse)
 685                 host_client->edict->fields.server->impulse = move->impulse;
 686         // only send the impulse to qc once
 687         move->impulse = 0;
 688         VectorCopy(move->viewangles, host_client->edict->fields.server->v_angle);
 689         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button3))) val->_float = ((move->buttons >> 2) & 1);
 690         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button4))) val->_float = ((move->buttons >> 3) & 1);
 691         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button5))) val->_float = ((move->buttons >> 4) & 1);
 692         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button6))) val->_float = ((move->buttons >> 5) & 1);
 693         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button7))) val->_float = ((move->buttons >> 6) & 1);
 694         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button8))) val->_float = ((move->buttons >> 7) & 1);
 695         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button9))) val->_float = ((move->buttons >> 11) & 1);
 696         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button10))) val->_float = ((move->buttons >> 12) & 1);
 697         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button11))) val->_float = ((move->buttons >> 13) & 1);
 698         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button12))) val->_float = ((move->buttons >> 14) & 1);
 699         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button13))) val->_float = ((move->buttons >> 15) & 1);
 700         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button14))) val->_float = ((move->buttons >> 16) & 1);
 701         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button15))) val->_float = ((move->buttons >> 17) & 1);
 702         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.button16))) val->_float = ((move->buttons >> 18) & 1);
 703         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.buttonuse))) val->_float = ((move->buttons >> 8) & 1);
 704         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.buttonchat))) val->_float = ((move->buttons >> 9) & 1);
 705         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.cursor_active))) val->_float = ((move->buttons >> 10) & 1);
 706         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.movement))) VectorSet(val->vector, move->forwardmove, move->sidemove, move->upmove);
 707         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.cursor_screen))) VectorCopy(move->cursor_screen, val->vector);
 708         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.cursor_trace_start))) VectorCopy(move->cursor_start, val->vector);
 709         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.cursor_trace_endpos))) VectorCopy(move->cursor_impact, val->vector);
 710         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.cursor_trace_ent))) val->edict = PRVM_EDICT_TO_PROG(PRVM_EDICT_NUM(move->cursor_entitynumber));
 711         if ((val = PRVM_EDICTFIELDVALUE(host_client->edict, prog->fieldoffsets.ping))) val->_float = host_client->ping * 1000.0;
 712 }
 713
 714 void SV_FrameLost(int framenum)
 715 {
 716         if (host_client->entitydatabase5)
 717         {
 718                 EntityFrame5_LostFrame(host_client->entitydatabase5, framenum);
 719                 EntityFrameCSQC_LostFrame(host_client, framenum);
 720         }
 721 }
 722
 723 void SV_FrameAck(int framenum)
 724 {
 725         if (host_client->entitydatabase)
 726                 EntityFrame_AckFrame(host_client->entitydatabase, framenum);
 727         else if (host_client->entitydatabase4)
 728                 EntityFrame4_AckFrame(host_client->entitydatabase4, framenum, true);
 729         else if (host_client->entitydatabase5)
 730                 EntityFrame5_AckFrame(host_client->entitydatabase5, framenum);
 731 }
 732
 733 /*
 734 ===================
 735 SV_ReadClientMessage
 736 ===================
 737 */
 738 extern void SV_SendServerinfo(client_t *client);
 739 extern sizebuf_t vm_tempstringsbuf;
 740 void SV_ReadClientMessage(void)
 741 {
 742         int cmd, num, start;
 743         char *s, *p, *q;
 744
 745         if(sv_autodemo_perclient.integer >= 2)
 746                 SV_WriteDemoMessage(host_client, &(host_client->netconnection->message), true);
 747
 748         //MSG_BeginReading ();
 749         sv_numreadmoves = 0;
 750
 751         for(;;)
 752         {
 753                 if (!host_client->active)
 754                 {
 755                         // a command caused an error
 756                         SV_DropClient (false);
 757                         return;
 758                 }
 759
 760                 if (msg_badread)
 761                 {
 762                         Con_Print("SV_ReadClientMessage: badread\n");
 763                         SV_DropClient (false);
 764                         return;
 765                 }
 766
 767                 cmd = MSG_ReadByte ();
 768                 if (cmd == -1)
 769                 {
 770                         // end of message
 771                         // apply the moves that were read this frame
 772                         SV_ExecuteClientMoves();
 773                         break;
 774                 }
 775
 776                 switch (cmd)
 777                 {
 778                 default:
 779                         Con_Printf("SV_ReadClientMessage: unknown command char %i\n", cmd);
 780                         SV_DropClient (false);
 781                         return;
 782
 783                 case clc_nop:
 784                         break;
 785
 786                 case clc_stringcmd:
 787                         // allow reliable messages now as the client is done with initial loading
 788                         if (host_client->sendsignon == 2)
 789                                 host_client->sendsignon = 0;
 790                         s = MSG_ReadString ();
 791                         q = NULL;
 792                         for(p = s; *p; ++p) switch(*p)
 793                         {
 794                                 case 10:
 795                                 case 13:
 796                                         if(!q)
 797                                                 q = p;
 798                                         break;
 799                                 default:
 800                                         if(q)
 801                                                 goto clc_stringcmd_invalid; // newline seen, THEN something else -> possible exploit
 802                                         break;
 803                         }
 804                         if(q)
 805                                 *q = 0;
 806                         if (strncasecmp(s, "spawn", 5) == 0
 807                          || strncasecmp(s, "begin", 5) == 0
 808                          || strncasecmp(s, "prespawn", 8) == 0)
 809                                 Cmd_ExecuteString (s, src_client);
 810                         else if (prog->funcoffsets.SV_ParseClientCommand)
 811                         {
 812                                 int restorevm_tempstringsbuf_cursize;
 813                                 restorevm_tempstringsbuf_cursize = vm_tempstringsbuf.cursize;
 814                                 PRVM_G_INT(OFS_PARM0) = PRVM_SetTempString(s);
 815                                 prog->globals.server->self = PRVM_EDICT_TO_PROG(host_client->edict);
 816                                 PRVM_ExecuteProgram (prog->funcoffsets.SV_ParseClientCommand, "QC function SV_ParseClientCommand is missing");
 817                                 vm_tempstringsbuf.cursize = restorevm_tempstringsbuf_cursize;
 818                         }
 819                         else
 820                                 Cmd_ExecuteString (s, src_client);
 821                         break;
 822
 823 clc_stringcmd_invalid:
 824                         Con_Printf("Received invalid stringcmd from %s\n", host_client->name);
 825                         if(developer.integer)
 826                                 Com_HexDumpToConsole((unsigned char *) s, strlen(s));
 827                         break;
 828
 829                 case clc_disconnect:
 830                         SV_DropClient (false); // client wants to disconnect
 831                         return;
 832
 833                 case clc_move:
 834                         SV_ReadClientMove();
 835                         break;
 836
 837                 case clc_ackdownloaddata:
 838                         start = MSG_ReadLong();
 839                         num = MSG_ReadShort();
 840                         if (host_client->download_file && host_client->download_started)
 841                         {
 842                                 if (host_client->download_expectedposition == start)
 843                                 {
 844                                         int size = (int)FS_FileSize(host_client->download_file);
 845                                         // a data block was successfully received by the client,
 846                                         // update the expected position on the next data block
 847                                         host_client->download_expectedposition = start + num;
 848                                         // if this was the last data block of the file, it's done
 849                                         if (host_client->download_expectedposition >= FS_FileSize(host_client->download_file))
 850                                         {
 851                                                 // tell the client that the download finished
 852                                                 // we need to calculate the crc now
 853                                                 //
 854                                                 // note: at this point the OS probably has the file
 855                                                 // entirely in memory, so this is a faster operation
 856                                                 // now than it was when the download started.
 857                                                 //
 858                                                 // it is also preferable to do this at the end of the
 859                                                 // download rather than the start because it reduces
 860                                                 // potential for Denial Of Service attacks against the
 861                                                 // server.
 862                                                 int crc;
 863                                                 unsigned char *temp;
 864                                                 FS_Seek(host_client->download_file, 0, SEEK_SET);
 865                                                 temp = (unsigned char *) Mem_Alloc(tempmempool, size);
 866                                                 FS_Read(host_client->download_file, temp, size);
 867                                                 crc = CRC_Block(temp, size);
 868                                                 Mem_Free(temp);
 869                                                 // calculated crc, send the file info to the client
 870                                                 // (so that it can verify the data)
 871                                                 Host_ClientCommands("\ncl_downloadfinished %i %i %s\n", size, crc, host_client->download_name);
 872                                                 Con_DPrintf("Download of %s by %s has finished\n", host_client->download_name, host_client->name);
 873                                                 FS_Close(host_client->download_file);
 874                                                 host_client->download_file = NULL;
 875                                                 host_client->download_name[0] = 0;
 876                                                 host_client->download_expectedposition = 0;
 877                                                 host_client->download_started = false;
 878                                         }
 879                                 }
 880                                 else
 881                                 {
 882                                         // a data block was lost, reset to the expected position
 883                                         // and resume sending from there
 884                                         FS_Seek(host_client->download_file, host_client->download_expectedposition, SEEK_SET);
 885                                 }
 886                         }
 887                         break;
 888
 889                 case clc_ackframe:
 890                         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 891                         num = MSG_ReadLong();
 892                         if (msg_badread) Con_Printf("SV_ReadClientMessage: badread at %s:%i\n", __FILE__, __LINE__);
 893                         if (developer_networkentities.integer >= 10)
 894                                 Con_Printf("recv clc_ackframe %i\n", num);
 895                         // if the client hasn't progressed through signons yet,
 896                         // ignore any clc_ackframes we get (they're probably from the
 897                         // previous level)
 898                         if (host_client->spawned && host_client->latestframenum < num)
 899                         {
 900                                 int i;
 901                                 for (i = host_client->latestframenum + 1;i < num;i++)
 902                                         SV_FrameLost(i);
 903                                 SV_FrameAck(num);
 904                                 host_client->latestframenum = num;
 905                         }
 906                         break;
 907                 }
 908         }
 909 }
 910