protocol.c

   1
   2 #include "quakedef.h"
   3
   4 entity_state_t defaultstate =
   5 {
   6         0,//double time; // time this state was built
   7         {0,0,0},//vec3_t origin;
   8         {0,0,0},//vec3_t angles;
   9         0,//int number; // entity number this state is for
  10         0,//unsigned short active; // true if a valid state
  11         0,//unsigned short modelindex;
  12         0,//unsigned short frame;
  13         0,//unsigned short effects;
  14         0,//unsigned short tagentity;
  15         0,//unsigned short specialvisibilityradius;
  16         0,//unsigned short viewmodelforclient;
  17         0,//unsigned short exteriormodelforclient;
  18         0,//unsigned short nodrawtoclient;
  19         0,//unsigned short drawonlytoclient;
  20         {0,0,0,0},//short light[4];
  21         0,//qbyte lightstyle;
  22         0,//qbyte lightpflags;
  23         0,//qbyte colormap;
  24         0,//qbyte skin;
  25         255,//qbyte alpha;
  26         16,//qbyte scale;
  27         0,//qbyte glowsize;
  28         254,//qbyte glowcolor;
  29         0,//qbyte flags;
  30         0,//qbyte tagindex;
  31         {0,0,0,0,0,0}//qbyte unused[6];
  32 };
  33
  34 void ClearStateToDefault(entity_state_t *s)
  35 {
  36         *s = defaultstate;
  37         /*
  38         memset(s, 0, sizeof(*s));
  39         s->alpha = 255;
  40         s->scale = 16;
  41         s->glowcolor = 254;
  42         */
  43 }
  44
  45 void EntityState_Write(entity_state_t *ent, sizebuf_t *msg, entity_state_t *delta)
  46 {
  47         int bits;
  48         vec3_t org, deltaorg;
  49         if (ent->active)
  50         {
  51                 // if not active last frame, delta from defaults
  52                 if (!delta->active)
  53                         delta = &defaultstate;
  54                 bits = 0;
  55                 VectorCopy(ent->origin, org);
  56                 VectorCopy(delta->origin, deltaorg);
  57                 if (ent->flags & RENDER_LOWPRECISION)
  58                 {
  59                         if (org[0] > 0)
  60                                 org[0] = (int) (org[0] + 0.5f);
  61                         else
  62                                 org[0] = (int) (org[0] - 0.5f);
  63                         if (org[1] > 0)
  64                                 org[1] = (int) (org[1] + 0.5f);
  65                         else
  66                                 org[1] = (int) (org[1] - 0.5f);
  67                         if (org[2] > 0)
  68                                 org[2] = (int) (org[2] + 0.5f);
  69                         else
  70                                 org[2] = (int) (org[2] - 0.5f);
  71                 }
  72                 if (delta->flags & RENDER_LOWPRECISION)
  73                 {
  74                         if (deltaorg[0] > 0)
  75                                 deltaorg[0] = (int) (deltaorg[0] + 0.5f);
  76                         else
  77                                 deltaorg[0] = (int) (deltaorg[0] - 0.5f);
  78                         if (deltaorg[1] > 0)
  79                                 deltaorg[1] = (int) (deltaorg[1] + 0.5f);
  80                         else
  81                                 deltaorg[1] = (int) (deltaorg[1] - 0.5f);
  82                         if (deltaorg[2] > 0)
  83                                 deltaorg[2] = (int) (deltaorg[2] + 0.5f);
  84                         else
  85                                 deltaorg[2] = (int) (deltaorg[2] - 0.5f);
  86                 }
  87                 if (fabs(org[0] - deltaorg[0]) > 0.01f)
  88                         bits |= E_ORIGIN1;
  89                 if (fabs(org[1] - deltaorg[1]) > 0.01f)
  90                         bits |= E_ORIGIN2;
  91                 if (fabs(org[2] - deltaorg[2]) > 0.01f)
  92                         bits |= E_ORIGIN3;
  93                 if ((qbyte) (ent->angles[0] * (256.0f / 360.0f)) != (qbyte) (delta->angles[0] * (256.0f / 360.0f)))
  94                         bits |= E_ANGLE1;
  95                 if ((qbyte) (ent->angles[1] * (256.0f / 360.0f)) != (qbyte) (delta->angles[1] * (256.0f / 360.0f)))
  96                         bits |= E_ANGLE2;
  97                 if ((qbyte) (ent->angles[2] * (256.0f / 360.0f)) != (qbyte) (delta->angles[2] * (256.0f / 360.0f)))
  98                         bits |= E_ANGLE3;
  99                 if ((ent->modelindex ^ delta->modelindex) & 0x00FF)
 100                         bits |= E_MODEL1;
 101                 if ((ent->modelindex ^ delta->modelindex) & 0xFF00)
 102                         bits |= E_MODEL2;
 103                 if ((ent->frame ^ delta->frame) & 0x00FF)
 104                         bits |= E_FRAME1;
 105                 if ((ent->frame ^ delta->frame) & 0xFF00)
 106                         bits |= E_FRAME2;
 107                 if ((ent->effects ^ delta->effects) & 0x00FF)
 108                         bits |= E_EFFECTS1;
 109                 if ((ent->effects ^ delta->effects) & 0xFF00)
 110                         bits |= E_EFFECTS2;
 111                 if (ent->colormap != delta->colormap)
 112                         bits |= E_COLORMAP;
 113                 if (ent->skin != delta->skin)
 114                         bits |= E_SKIN;
 115                 if (ent->alpha != delta->alpha)
 116                         bits |= E_ALPHA;
 117                 if (ent->scale != delta->scale)
 118                         bits |= E_SCALE;
 119                 if (ent->glowsize != delta->glowsize)
 120                         bits |= E_GLOWSIZE;
 121                 if (ent->glowcolor != delta->glowcolor)
 122                         bits |= E_GLOWCOLOR;
 123                 if (ent->flags != delta->flags)
 124                         bits |= E_FLAGS;
 125                 if (ent->tagindex != delta->tagindex || ent->tagentity != delta->tagentity)
 126                         bits |= E_TAGATTACHMENT;
 127                 if (ent->light[0] != delta->light[0] || ent->light[1] != delta->light[1] || ent->light[2] != delta->light[2] || ent->light[3] != delta->light[3])
 128                         bits |= E_LIGHT;
 129                 if (ent->lightstyle != delta->lightstyle)
 130                         bits |= E_LIGHTSTYLE;
 131                 if (ent->lightpflags != delta->lightpflags)
 132                         bits |= E_LIGHTPFLAGS;
 133
 134                 if (bits) // don't send anything if it hasn't changed
 135                 {
 136                         if (bits & 0xFF000000)
 137                                 bits |= E_EXTEND3;
 138                         if (bits & 0x00FF0000)
 139                                 bits |= E_EXTEND2;
 140                         if (bits & 0x0000FF00)
 141                                 bits |= E_EXTEND1;
 142
 143                         MSG_WriteShort(msg, ent->number);
 144                         MSG_WriteByte(msg, bits & 0xFF);
 145                         if (bits & E_EXTEND1)
 146                         {
 147                                 MSG_WriteByte(msg, (bits >> 8) & 0xFF);
 148                                 if (bits & E_EXTEND2)
 149                                 {
 150                                         MSG_WriteByte(msg, (bits >> 16) & 0xFF);
 151                                         if (bits & E_EXTEND3)
 152                                                 MSG_WriteByte(msg, (bits >> 24) & 0xFF);
 153                                 }
 154                         }
 155                         // LordHavoc: have to write flags first, as they can modify protocol
 156                         if (bits & E_FLAGS)
 157                                 MSG_WriteByte(msg, ent->flags);
 158                         if (ent->flags & RENDER_LOWPRECISION)
 159                         {
 160                                 if (bits & E_ORIGIN1)
 161                                         MSG_WriteShort(msg, org[0]);
 162                                 if (bits & E_ORIGIN2)
 163                                         MSG_WriteShort(msg, org[1]);
 164                                 if (bits & E_ORIGIN3)
 165                                         MSG_WriteShort(msg, org[2]);
 166                         }
 167                         else
 168                         {
 169                                 if (bits & E_ORIGIN1)
 170                                         MSG_WriteFloat(msg, org[0]);
 171                                 if (bits & E_ORIGIN2)
 172                                         MSG_WriteFloat(msg, org[1]);
 173                                 if (bits & E_ORIGIN3)
 174                                         MSG_WriteFloat(msg, org[2]);
 175                         }
 176                         if (bits & E_ANGLE1)
 177                                 MSG_WriteAngle(msg, ent->angles[0]);
 178                         if (bits & E_ANGLE2)
 179                                 MSG_WriteAngle(msg, ent->angles[1]);
 180                         if (bits & E_ANGLE3)
 181                                 MSG_WriteAngle(msg, ent->angles[2]);
 182                         if (bits & E_MODEL1)
 183                                 MSG_WriteByte(msg, ent->modelindex & 0xFF);
 184                         if (bits & E_MODEL2)
 185                                 MSG_WriteByte(msg, (ent->modelindex >> 8) & 0xFF);
 186                         if (bits & E_FRAME1)
 187                                 MSG_WriteByte(msg, ent->frame & 0xFF);
 188                         if (bits & E_FRAME2)
 189                                 MSG_WriteByte(msg, (ent->frame >> 8) & 0xFF);
 190                         if (bits & E_EFFECTS1)
 191                                 MSG_WriteByte(msg, ent->effects & 0xFF);
 192                         if (bits & E_EFFECTS2)
 193                                 MSG_WriteByte(msg, (ent->effects >> 8) & 0xFF);
 194                         if (bits & E_COLORMAP)
 195                                 MSG_WriteByte(msg, ent->colormap);
 196                         if (bits & E_SKIN)
 197                                 MSG_WriteByte(msg, ent->skin);
 198                         if (bits & E_ALPHA)
 199                                 MSG_WriteByte(msg, ent->alpha);
 200                         if (bits & E_SCALE)
 201                                 MSG_WriteByte(msg, ent->scale);
 202                         if (bits & E_GLOWSIZE)
 203                                 MSG_WriteByte(msg, ent->glowsize);
 204                         if (bits & E_GLOWCOLOR)
 205                                 MSG_WriteByte(msg, ent->glowcolor);
 206                         if (bits & E_TAGATTACHMENT)
 207                         {
 208                                 MSG_WriteShort(msg, ent->tagentity);
 209                                 MSG_WriteByte(msg, ent->tagindex);
 210                         }
 211                         if (bits & E_LIGHT)
 212                         {
 213                                 MSG_WriteShort(msg, ent->light[0]);
 214                                 MSG_WriteShort(msg, ent->light[1]);
 215                                 MSG_WriteShort(msg, ent->light[2]);
 216                                 MSG_WriteShort(msg, ent->light[3]);
 217                         }
 218                         if (bits & E_LIGHTSTYLE)
 219                                 MSG_WriteByte(msg, ent->lightstyle);
 220                         if (bits & E_LIGHTPFLAGS)
 221                                 MSG_WriteByte(msg, ent->lightpflags);
 222                 }
 223         }
 224         else if (delta->active)
 225                 MSG_WriteShort(msg, ent->number | 0x8000);
 226 }
 227
 228 void EntityState_ReadUpdate(entity_state_t *e, int number)
 229 {
 230         int bits;
 231         cl_entities_active[number] = true;
 232         e->active = true;
 233         e->time = cl.mtime[0];
 234         e->number = number;
 235
 236         bits = MSG_ReadByte();
 237         if (bits & E_EXTEND1)
 238         {
 239                 bits |= MSG_ReadByte() << 8;
 240                 if (bits & E_EXTEND2)
 241                 {
 242                         bits |= MSG_ReadByte() << 16;
 243                         if (bits & E_EXTEND3)
 244                                 bits |= MSG_ReadByte() << 24;
 245                 }
 246         }
 247
 248         if (cl.protocol == PROTOCOL_DARKPLACES2)
 249         {
 250                 if (bits & E_ORIGIN1)
 251                         e->origin[0] = (signed short) MSG_ReadShort();
 252                 if (bits & E_ORIGIN2)
 253                         e->origin[1] = (signed short) MSG_ReadShort();
 254                 if (bits & E_ORIGIN3)
 255                         e->origin[2] = (signed short) MSG_ReadShort();
 256         }
 257         else
 258         {
 259                 if (bits & E_FLAGS)
 260                         e->flags = MSG_ReadByte();
 261                 if (e->flags & RENDER_LOWPRECISION || cl.protocol == PROTOCOL_DARKPLACES2)
 262                 {
 263                         if (bits & E_ORIGIN1)
 264                                 e->origin[0] = (signed short) MSG_ReadShort();
 265                         if (bits & E_ORIGIN2)
 266                                 e->origin[1] = (signed short) MSG_ReadShort();
 267                         if (bits & E_ORIGIN3)
 268                                 e->origin[2] = (signed short) MSG_ReadShort();
 269                 }
 270                 else
 271                 {
 272                         if (bits & E_ORIGIN1)
 273                                 e->origin[0] = MSG_ReadFloat();
 274                         if (bits & E_ORIGIN2)
 275                                 e->origin[1] = MSG_ReadFloat();
 276                         if (bits & E_ORIGIN3)
 277                                 e->origin[2] = MSG_ReadFloat();
 278                 }
 279         }
 280         if (bits & E_ANGLE1)
 281                 e->angles[0] = MSG_ReadAngle();
 282         if (bits & E_ANGLE2)
 283                 e->angles[1] = MSG_ReadAngle();
 284         if (bits & E_ANGLE3)
 285                 e->angles[2] = MSG_ReadAngle();
 286         if (bits & E_MODEL1)
 287                 e->modelindex = (e->modelindex & 0xFF00) | (unsigned int) MSG_ReadByte();
 288         if (bits & E_MODEL2)
 289                 e->modelindex = (e->modelindex & 0x00FF) | ((unsigned int) MSG_ReadByte() << 8);
 290         if (bits & E_FRAME1)
 291                 e->frame = (e->frame & 0xFF00) | (unsigned int) MSG_ReadByte();
 292         if (bits & E_FRAME2)
 293                 e->frame = (e->frame & 0x00FF) | ((unsigned int) MSG_ReadByte() << 8);
 294         if (bits & E_EFFECTS1)
 295                 e->effects = (e->effects & 0xFF00) | (unsigned int) MSG_ReadByte();
 296         if (bits & E_EFFECTS2)
 297                 e->effects = (e->effects & 0x00FF) | ((unsigned int) MSG_ReadByte() << 8);
 298         if (bits & E_COLORMAP)
 299                 e->colormap = MSG_ReadByte();
 300         if (bits & E_SKIN)
 301                 e->skin = MSG_ReadByte();
 302         if (bits & E_ALPHA)
 303                 e->alpha = MSG_ReadByte();
 304         if (bits & E_SCALE)
 305                 e->scale = MSG_ReadByte();
 306         if (bits & E_GLOWSIZE)
 307                 e->glowsize = MSG_ReadByte();
 308         if (bits & E_GLOWCOLOR)
 309                 e->glowcolor = MSG_ReadByte();
 310         if (cl.protocol == PROTOCOL_DARKPLACES2)
 311                 if (bits & E_FLAGS)
 312                         e->flags = MSG_ReadByte();
 313         if (bits & E_TAGATTACHMENT)
 314         {
 315                 e->tagentity = MSG_ReadShort();
 316                 e->tagindex = MSG_ReadByte();
 317         }
 318         if (bits & E_LIGHT)
 319         {
 320                 e->light[0] = MSG_ReadShort();
 321                 e->light[1] = MSG_ReadShort();
 322                 e->light[2] = MSG_ReadShort();
 323                 e->light[3] = MSG_ReadShort();
 324         }
 325         if (bits & E_LIGHTSTYLE)
 326                 e->lightstyle = MSG_ReadByte();
 327         if (bits & E_LIGHTPFLAGS)
 328                 e->lightpflags = MSG_ReadByte();
 329
 330         if (developer_networkentities.integer >= 2)
 331         {
 332                 Con_Printf("ReadUpdate e%i", number);
 333
 334                 if (bits & E_ORIGIN1)
 335                         Con_Printf(" E_ORIGIN1 %f", e->origin[0]);
 336                 if (bits & E_ORIGIN2)
 337                         Con_Printf(" E_ORIGIN2 %f", e->origin[1]);
 338                 if (bits & E_ORIGIN3)
 339                         Con_Printf(" E_ORIGIN3 %f", e->origin[2]);
 340                 if (bits & E_ANGLE1)
 341                         Con_Printf(" E_ANGLE1 %f", e->angles[0]);
 342                 if (bits & E_ANGLE2)
 343                         Con_Printf(" E_ANGLE2 %f", e->angles[1]);
 344                 if (bits & E_ANGLE3)
 345                         Con_Printf(" E_ANGLE3 %f", e->angles[2]);
 346                 if (bits & (E_MODEL1 | E_MODEL2))
 347                         Con_Printf(" E_MODEL %i", e->modelindex);
 348
 349                 if (bits & (E_FRAME1 | E_FRAME2))
 350                         Con_Printf(" E_FRAME %i", e->frame);
 351                 if (bits & (E_EFFECTS1 | E_EFFECTS2))
 352                         Con_Printf(" E_EFFECTS %i", e->effects);
 353                 if (bits & E_ALPHA)
 354                         Con_Printf(" E_ALPHA %f", e->alpha / 255.0f);
 355                 if (bits & E_SCALE)
 356                         Con_Printf(" E_SCALE %f", e->scale / 16.0f);
 357                 if (bits & E_COLORMAP)
 358                         Con_Printf(" E_COLORMAP %i", e->colormap);
 359                 if (bits & E_SKIN)
 360                         Con_Printf(" E_SKIN %i", e->skin);
 361
 362                 if (bits & E_GLOWSIZE)
 363                         Con_Printf(" E_GLOWSIZE %i", e->glowsize * 4);
 364                 if (bits & E_GLOWCOLOR)
 365                         Con_Printf(" E_GLOWCOLOR %i", e->glowcolor);
 366
 367                 if (bits & E_LIGHT)
 368                         Con_Printf(" E_LIGHT %i:%i:%i:%i", e->light[0], e->light[1], e->light[2], e->light[3]);
 369                 if (bits & E_LIGHTPFLAGS)
 370                         Con_Printf(" E_LIGHTPFLAGS %i", e->lightpflags);
 371
 372                 if (bits & E_TAGATTACHMENT)
 373                         Con_Printf(" E_TAGATTACHMENT e%i:%i", e->tagentity, e->tagindex);
 374                 if (bits & E_LIGHTSTYLE)
 375                         Con_Printf(" E_LIGHTSTYLE %i", e->lightstyle);
 376                 Con_Printf("\n");
 377         }
 378 }
 379
 380 // (server) clears the database to contain no frames (thus delta compression compresses against nothing)
 381 void EntityFrame_ClearDatabase(entity_database_t *d)
 382 {
 383         memset(d, 0, sizeof(*d));
 384 }
 385
 386 // (server and client) removes frames older than 'frame' from database
 387 void EntityFrame_AckFrame(entity_database_t *d, int frame)
 388 {
 389         int i;
 390         if (d->ackframe < frame)
 391                 d->ackframe = frame;
 392         for (i = 0;i < d->numframes && d->frames[i].framenum < frame;i++);
 393         // ignore outdated frame acks (out of order packets)
 394         if (i == 0)
 395                 return;
 396         d->numframes -= i;
 397         // if some queue is left, slide it down to beginning of array
 398         if (d->numframes)
 399                 memmove(&d->frames[0], &d->frames[i], sizeof(d->frames[0]) * d->numframes);
 400 }
 401
 402 // (server) clears frame, to prepare for adding entities
 403 void EntityFrame_Clear(entity_frame_t *f, vec3_t eye, int framenum)
 404 {
 405         f->time = 0;
 406         f->framenum = framenum;
 407         f->numentities = 0;
 408         if (eye == NULL)
 409         {
 410                 VectorClear(f->eye);
 411         }
 412         else
 413         {
 414                 VectorCopy(eye, f->eye);
 415         }
 416 }
 417
 418 // (server) adds an entity to frame
 419 void EntityFrame_AddEntity(entity_frame_t *f, entity_state_t *s)
 420 {
 421         if (f->numentities < MAX_ENTITY_DATABASE)
 422         {
 423                 f->entitydata[f->numentities] = *s;
 424                 f->entitydata[f->numentities++].active = true;
 425         }
 426 }
 427
 428 // (server and client) reads a frame from the database
 429 void EntityFrame_FetchFrame(entity_database_t *d, int framenum, entity_frame_t *f)
 430 {
 431         int i, n;
 432         EntityFrame_Clear(f, NULL, -1);
 433         for (i = 0;i < d->numframes && d->frames[i].framenum < framenum;i++);
 434         if (i < d->numframes && framenum == d->frames[i].framenum)
 435         {
 436                 f->framenum = framenum;
 437                 f->numentities = d->frames[i].endentity - d->frames[i].firstentity;
 438                 n = MAX_ENTITY_DATABASE - (d->frames[i].firstentity % MAX_ENTITY_DATABASE);
 439                 if (n > f->numentities)
 440                         n = f->numentities;
 441                 memcpy(f->entitydata, d->entitydata + d->frames[i].firstentity % MAX_ENTITY_DATABASE, sizeof(*f->entitydata) * n);
 442                 if (f->numentities > n)
 443                         memcpy(f->entitydata + n, d->entitydata, sizeof(*f->entitydata) * (f->numentities - n));
 444                 VectorCopy(d->eye, f->eye);
 445         }
 446 }
 447
 448 // (server and client) adds a entity_frame to the database, for future reference
 449 void EntityFrame_AddFrame(entity_database_t *d, entity_frame_t *f)
 450 {
 451         int n, e;
 452         entity_frameinfo_t *info;
 453
 454         VectorCopy(f->eye, d->eye);
 455
 456         // figure out how many entity slots are used already
 457         if (d->numframes)
 458         {
 459                 n = d->frames[d->numframes - 1].endentity - d->frames[0].firstentity;
 460                 if (n + f->numentities > MAX_ENTITY_DATABASE || d->numframes >= MAX_ENTITY_HISTORY)
 461                 {
 462                         // ran out of room, dump database
 463                         EntityFrame_ClearDatabase(d);
 464                 }
 465         }
 466
 467         info = &d->frames[d->numframes];
 468         info->framenum = f->framenum;
 469         e = -1000;
 470         // make sure we check the newly added frame as well, but we haven't incremented numframes yet
 471         for (n = 0;n <= d->numframes;n++)
 472         {
 473                 if (e >= d->frames[n].framenum)
 474                 {
 475                         if (e == f->framenum)
 476                                 Con_Printf("EntityFrame_AddFrame: tried to add out of sequence frame to database\n");
 477                         else
 478                                 Con_Printf("EntityFrame_AddFrame: out of sequence frames in database\n");
 479                         return;
 480                 }
 481                 e = d->frames[n].framenum;
 482         }
 483         // if database still has frames after that...
 484         if (d->numframes)
 485                 info->firstentity = d->frames[d->numframes - 1].endentity;
 486         else
 487                 info->firstentity = 0;
 488         info->endentity = info->firstentity + f->numentities;
 489         d->numframes++;
 490
 491         n = info->firstentity % MAX_ENTITY_DATABASE;
 492         e = MAX_ENTITY_DATABASE - n;
 493         if (e > f->numentities)
 494                 e = f->numentities;
 495         memcpy(d->entitydata + n, f->entitydata, sizeof(entity_state_t) * e);
 496         if (f->numentities > e)
 497                 memcpy(d->entitydata, f->entitydata + e, sizeof(entity_state_t) * (f->numentities - e));
 498 }
 499
 500 // (server) writes a frame to network stream
 501 static entity_frame_t deltaframe; // FIXME?
 502 void EntityFrame_Write(entity_database_t *d, entity_frame_t *f, sizebuf_t *msg)
 503 {
 504         int i, onum, number;
 505         entity_frame_t *o = &deltaframe;
 506         entity_state_t *ent, *delta;
 507
 508         EntityFrame_AddFrame(d, f);
 509
 510         EntityFrame_FetchFrame(d, d->ackframe > 0 ? d->ackframe : -1, o);
 511         MSG_WriteByte (msg, svc_entities);
 512         MSG_WriteLong (msg, o->framenum);
 513         MSG_WriteLong (msg, f->framenum);
 514         MSG_WriteFloat (msg, f->eye[0]);
 515         MSG_WriteFloat (msg, f->eye[1]);
 516         MSG_WriteFloat (msg, f->eye[2]);
 517
 518         onum = 0;
 519         for (i = 0;i < f->numentities;i++)
 520         {
 521                 ent = f->entitydata + i;
 522                 number = ent->number;
 523                 for (;onum < o->numentities && o->entitydata[onum].number < number;onum++)
 524                 {
 525                         // write remove message
 526                         MSG_WriteShort(msg, o->entitydata[onum].number | 0x8000);
 527                 }
 528                 if (onum < o->numentities && (o->entitydata[onum].number == number))
 529                 {
 530                         // delta from previous frame
 531                         delta = o->entitydata + onum;
 532                         // advance to next entity in delta frame
 533                         onum++;
 534                 }
 535                 else
 536                 {
 537                         // delta from defaults
 538                         delta = &defaultstate;
 539                 }
 540                 EntityState_Write(ent, msg, delta);
 541         }
 542         for (;onum < o->numentities;onum++)
 543         {
 544                 // write remove message
 545                 MSG_WriteShort(msg, o->entitydata[onum].number | 0x8000);
 546         }
 547         MSG_WriteShort(msg, 0xFFFF);
 548 }
 549
 550 // (client) reads a frame from network stream
 551 static entity_frame_t framedata; // FIXME?
 552 void EntityFrame_Read(entity_database_t *d)
 553 {
 554         int number, removed;
 555         entity_frame_t *f = &framedata, *delta = &deltaframe;
 556         entity_state_t *e, *old, *oldend;
 557
 558         EntityFrame_Clear(f, NULL, -1);
 559
 560         // read the frame header info
 561         f->time = cl.mtime[0];
 562         number = MSG_ReadLong();
 563         f->framenum = MSG_ReadLong();
 564         f->eye[0] = MSG_ReadFloat();
 565         f->eye[1] = MSG_ReadFloat();
 566         f->eye[2] = MSG_ReadFloat();
 567         EntityFrame_AckFrame(d, number);
 568         EntityFrame_FetchFrame(d, number, delta);
 569         old = delta->entitydata;
 570         oldend = old + delta->numentities;
 571         // read entities until we hit the magic 0xFFFF end tag
 572         while ((number = (unsigned short) MSG_ReadShort()) != 0xFFFF)
 573         {
 574                 if (msg_badread)
 575                         Host_Error("EntityFrame_Read: read error\n");
 576                 removed = number & 0x8000;
 577                 number &= 0x7FFF;
 578                 if (number >= MAX_EDICTS)
 579                         Host_Error("EntityFrame_Read: number (%i) >= MAX_EDICTS (%i)\n", number, MAX_EDICTS);
 580
 581                 // seek to entity, while copying any skipped entities (assume unchanged)
 582                 while (old < oldend && old->number < number)
 583                 {
 584                         if (f->numentities >= MAX_ENTITY_DATABASE)
 585                                 Host_Error("EntityFrame_Read: entity list too big\n");
 586                         f->entitydata[f->numentities] = *old++;
 587                         f->entitydata[f->numentities++].time = cl.mtime[0];
 588                 }
 589                 if (removed)
 590                 {
 591                         if (old < oldend && old->number == number)
 592                                 old++;
 593                         else
 594                                 Con_Printf("EntityFrame_Read: REMOVE on unused entity %i\n", number);
 595                 }
 596                 else
 597                 {
 598                         if (f->numentities >= MAX_ENTITY_DATABASE)
 599                                 Host_Error("EntityFrame_Read: entity list too big\n");
 600
 601                         // reserve this slot
 602                         e = f->entitydata + f->numentities++;
 603
 604                         if (old < oldend && old->number == number)
 605                         {
 606                                 // delta from old entity
 607                                 *e = *old++;
 608                         }
 609                         else
 610                         {
 611                                 // delta from defaults
 612                                 *e = defaultstate;
 613                         }
 614
 615                         EntityState_ReadUpdate(e, number);
 616                 }
 617         }
 618         while (old < oldend)
 619         {
 620                 if (f->numentities >= MAX_ENTITY_DATABASE)
 621                         Host_Error("EntityFrame_Read: entity list too big\n");
 622                 f->entitydata[f->numentities] = *old++;
 623                 f->entitydata[f->numentities++].time = cl.mtime[0];
 624         }
 625         EntityFrame_AddFrame(d, f);
 626 }
 627
 628
 629 // (client) returns the frame number of the most recent frame recieved
 630 int EntityFrame_MostRecentlyRecievedFrameNum(entity_database_t *d)
 631 {
 632         if (d->numframes)
 633                 return d->frames[d->numframes - 1].framenum;
 634         else
 635                 return -1;
 636 }
 637
 638
 639
 640
 641
 642
 643 entity_state_t *EntityFrame4_GetReferenceEntity(entity_database4_t *d, int number)
 644 {
 645         if (d->maxreferenceentities <= number)
 646         {
 647                 int oldmax = d->maxreferenceentities;
 648                 entity_state_t *oldentity = d->referenceentity;
 649                 d->maxreferenceentities = (number + 15) & ~7;
 650                 d->referenceentity = Mem_Alloc(d->mempool, d->maxreferenceentities * sizeof(*d->referenceentity));
 651                 if (oldentity)
 652                 {
 653                         memcpy(d->referenceentity, oldentity, oldmax * sizeof(*d->referenceentity));
 654                         Mem_Free(oldentity);
 655                 }
 656                 // clear the newly created entities
 657                 for (;oldmax < d->maxreferenceentities;oldmax++)
 658                 {
 659                         d->referenceentity[oldmax] = defaultstate;
 660                         d->referenceentity[oldmax].number = oldmax;
 661                 }
 662         }
 663         return d->referenceentity + number;
 664 }
 665
 666 void EntityFrame4_AddCommitEntity(entity_database4_t *d, entity_state_t *s)
 667 {
 668         // resize commit's entity list if full
 669         if (d->currentcommit->maxentities <= d->currentcommit->numentities)
 670         {
 671                 entity_state_t *oldentity = d->currentcommit->entity;
 672                 d->currentcommit->maxentities += 8;
 673                 d->currentcommit->entity = Mem_Alloc(d->mempool, d->currentcommit->maxentities * sizeof(*d->currentcommit->entity));
 674                 if (oldentity)
 675                 {
 676                         memcpy(d->currentcommit->entity, oldentity, d->currentcommit->numentities * sizeof(*d->currentcommit->entity));
 677                         Mem_Free(oldentity);
 678                 }
 679         }
 680         d->currentcommit->entity[d->currentcommit->numentities++] = *s;
 681 }
 682
 683 entity_database4_t *EntityFrame4_AllocDatabase(mempool_t *pool)
 684 {
 685         entity_database4_t *d;
 686         d = Mem_Alloc(pool, sizeof(*d));
 687         d->mempool = pool;
 688         EntityFrame4_ResetDatabase(d);
 689         d->ackframenum = -1;
 690         return d;
 691 }
 692
 693 void EntityFrame4_FreeDatabase(entity_database4_t *d)
 694 {
 695         int i;
 696         for (i = 0;i < MAX_ENTITY_HISTORY;i++)
 697                 if (d->commit[i].entity)
 698                         Mem_Free(d->commit[i].entity);
 699         if (d->referenceentity)
 700                 Mem_Free(d->referenceentity);
 701         Mem_Free(d);
 702 }
 703
 704 void EntityFrame4_ResetDatabase(entity_database4_t *d)
 705 {
 706         int i;
 707         d->referenceframenum = -1;
 708         for (i = 0;i < MAX_ENTITY_HISTORY;i++)
 709                 d->commit[i].numentities = 0;
 710         for (i = 0;i < d->maxreferenceentities;i++)
 711                 d->referenceentity[i] = defaultstate;
 712 }
 713
 714 int EntityFrame4_AckFrame(entity_database4_t *d, int framenum)
 715 {
 716         int i, j, found = false;
 717         entity_database4_commit_t *commit;
 718         if (d->referenceframenum == framenum)
 719                 return true;
 720         if (framenum == -1)
 721         {
 722                 EntityFrame4_ResetDatabase(d);
 723                 return true;
 724         }
 725         for (i = 0, commit = d->commit;i < MAX_ENTITY_HISTORY;i++, commit++)
 726         {
 727                 if (commit->numentities && commit->framenum <= framenum)
 728                 {
 729                         if (commit->framenum == framenum)
 730                         {
 731                                 found = true;
 732                                 d->referenceframenum = framenum;
 733                                 if (developer_networkentities.integer >= 3)
 734                                 {
 735                                         for (j = 0;j < commit->numentities;j++)
 736                                         {
 737                                                 entity_state_t *s = EntityFrame4_GetReferenceEntity(d, commit->entity[j].number);
 738                                                 if (commit->entity[j].active != s->active)
 739                                                 {
 740                                                         if (commit->entity[j].active)
 741                                                                 Con_Printf("commit entity %i has become active (modelindex %i)\n", commit->entity[j].number, commit->entity[j].modelindex);
 742                                                         else
 743                                                                 Con_Printf("commit entity %i has become inactive (modelindex %i)\n", commit->entity[j].number, commit->entity[j].modelindex);
 744                                                 }
 745                                                 *s = commit->entity[j];
 746                                         }
 747                                 }
 748                                 else
 749                                         for (j = 0;j < commit->numentities;j++)
 750                                                 *EntityFrame4_GetReferenceEntity(d, commit->entity[j].number) = commit->entity[j];
 751                         }
 752                         commit->numentities = 0;
 753                 }
 754         }
 755         return found;
 756 }
 757
 758 int EntityFrame4_SV_WriteFrame_Entity(entity_database4_t *d, sizebuf_t *msg, int maxbytes, entity_state_t *s)
 759 {
 760         qbyte data[128];
 761         sizebuf_t buf;
 762         entity_state_t *e;
 763         // prepare the buffer
 764         memset(&buf, 0, sizeof(buf));
 765         buf.data = data;
 766         buf.maxsize = sizeof(data);
 767         // make the message
 768         e = EntityFrame4_GetReferenceEntity(d, s->number);
 769         // send an update (may update or remove the entity)
 770         EntityState_Write(s, &buf, e);
 771         // if the message is empty, skip out now
 772         if (!buf.cursize)
 773                 return true;
 774         // if the commit is full, we're done
 775         if (msg->cursize + buf.cursize + 2 >= min(msg->maxsize, maxbytes))
 776                 return false;
 777         // add the entity to the commit
 778         EntityFrame4_AddCommitEntity(d, s);
 779         // write the message to the packet
 780         SZ_Write(msg, buf.data, buf.cursize);
 781         // carry on
 782         return true;
 783 }
 784
 785 extern void CL_MoveLerpEntityStates(entity_t *ent);
 786 void EntityFrame4_CL_ReadFrame(entity_database4_t *d)
 787 {
 788         int i, n, cnumber, referenceframenum, framenum, enumber, done, stopnumber, skip = false;
 789         // read the number of the frame this refers to
 790         referenceframenum = MSG_ReadLong();
 791         // read the number of this frame
 792         framenum = MSG_ReadLong();
 793         // read the start number
 794         enumber = MSG_ReadShort();
 795         if (developer_networkentities.integer >= 1)
 796         {
 797                 Con_Printf("recv svc_entities ref:%i num:%i (database: ref:%i commits:", referenceframenum, framenum, d->referenceframenum);
 798                 for (i = 0;i < MAX_ENTITY_HISTORY;i++)
 799                         if (d->commit[i].numentities)
 800                                 Con_Printf(" %i", d->commit[i].framenum);
 801                 Con_Printf("\n");
 802         }
 803         if (!EntityFrame4_AckFrame(d, referenceframenum))
 804         {
 805                 Con_Printf("EntityFrame4_CL_ReadFrame: reference frame invalid (VERY BAD ERROR), this update will be skipped\n");
 806                 skip = true;
 807                 d->ackframenum = -1;
 808                 EntityFrame4_ResetDatabase(d);
 809         }
 810         d->currentcommit = NULL;
 811         for (i = 0;i < MAX_ENTITY_HISTORY;i++)
 812         {
 813                 if (!d->commit[i].numentities)
 814                 {
 815                         d->currentcommit = d->commit + i;
 816                         d->currentcommit->framenum = d->ackframenum = framenum;
 817                         d->currentcommit->numentities = 0;
 818                 }
 819         }
 820         if (d->currentcommit == NULL)
 821         {
 822                 Con_Printf("EntityFrame4_CL_ReadFrame: error while decoding frame %i: database full, reading but not storing this update\n", framenum);
 823                 skip = true;
 824         }
 825         done = false;
 826         while (!done && !msg_badread)
 827         {
 828                 // read the number of the modified entity
 829                 // (gaps will be copied unmodified)
 830                 n = (unsigned short)MSG_ReadShort();
 831                 if (n == 0x8000)
 832                 {
 833                         // no more entities in this update, but we still need to copy the
 834                         // rest of the reference entities (final gap)
 835                         done = true;
 836                         // read end of range number, then process normally
 837                         n = (unsigned short)MSG_ReadShort();
 838                 }
 839                 // high bit means it's a remove message
 840                 cnumber = n & 0x7FFF;
 841                 // add one (the changed one) if not done
 842                 stopnumber = cnumber + !done;
 843                 // process entities in range from the last one to the changed one
 844                 for (;enumber < stopnumber;enumber++)
 845                 {
 846                         if (skip)
 847                         {
 848                                 if (enumber == cnumber && (n & 0x8000) == 0)
 849                                 {
 850                                         entity_state_t tempstate;
 851                                         EntityState_ReadUpdate(&tempstate, enumber);
 852                                 }
 853                                 continue;
 854                         }
 855                         // slide the current into the previous slot
 856                         cl_entities[enumber].state_previous = cl_entities[enumber].state_current;
 857                         // copy a new current from reference database
 858                         cl_entities[enumber].state_current = *EntityFrame4_GetReferenceEntity(d, enumber);
 859                         // if this is the one to modify, read more data...
 860                         if (enumber == cnumber)
 861                         {
 862                                 if (n & 0x8000)
 863                                 {
 864                                         // simply removed
 865                                         if (developer_networkentities.integer >= 2)
 866                                                 Con_Printf("entity %i: remove\n", enumber);
 867                                         cl_entities[enumber].state_current = defaultstate;
 868                                 }
 869                                 else
 870                                 {
 871                                         // read the changes
 872                                         if (developer_networkentities.integer >= 2)
 873                                                 Con_Printf("entity %i: update\n", enumber);
 874                                         EntityState_ReadUpdate(&cl_entities[enumber].state_current, enumber);
 875                                 }
 876                         }
 877                         else if (developer_networkentities.integer >= 4)
 878                                 Con_Printf("entity %i: copy\n", enumber);
 879                         // fix the number (it gets wiped occasionally by copying from defaultstate)
 880                         cl_entities[enumber].state_current.number = enumber;
 881                         // check if we need to update the lerp stuff
 882                         if (cl_entities[enumber].state_current.active)
 883                         {
 884                                 CL_MoveLerpEntityStates(&cl_entities[enumber]);
 885                                 cl_entities_active[enumber] = true;
 886                         }
 887                         // add this to the commit entry whether it is modified or not
 888                         if (d->currentcommit)
 889                                 EntityFrame4_AddCommitEntity(d, &cl_entities[enumber].state_current);
 890                         // print extra messages if desired
 891                         if (developer_networkentities.integer >= 2 && cl_entities[enumber].state_current.active != cl_entities[enumber].state_previous.active)
 892                         {
 893                                 if (cl_entities[enumber].state_current.active)
 894                                         Con_Printf("entity #%i has become active\n", enumber);
 895                                 else if (cl_entities[enumber].state_previous.active)
 896                                         Con_Printf("entity #%i has become inactive\n", enumber);
 897                         }
 898                 }
 899         }
 900         d->currentcommit = NULL;
 901 }
 902
 903