made quakec stuffed quake1 protocol entities work alongside newer protocols, to attem...
[divverent/darkplaces.git] / protocol.c
1
2 #include "quakedef.h"
3
4 // this is 80 bytes
5 entity_state_t defaultstate =
6 {
7         // ! means this is not sent to client
8         0,//double time; // ! time this state was built (used on client for interpolation)
9         {0,0,0},//float origin[3];
10         {0,0,0},//float angles[3];
11         0,//int number; // entity number this state is for
12         0,//int effects;
13         0,//unsigned short modelindex;
14         0,//unsigned short frame;
15         0,//unsigned short tagentity;
16         0,//unsigned short specialvisibilityradius; // ! larger if it has effects/light
17         0,//unsigned short viewmodelforclient; // !
18         0,//unsigned short exteriormodelforclient; // ! not shown if first person viewing from this entity, shown in all other cases
19         0,//unsigned short nodrawtoclient; // !
20         0,//unsigned short drawonlytoclient; // !
21         {0,0,0,0},//unsigned short light[4]; // color*256 (0.00 to 255.996), and radius*1
22         0,//unsigned char active; // true if a valid state
23         0,//unsigned char lightstyle;
24         0,//unsigned char lightpflags;
25         0,//unsigned char colormap;
26         0,//unsigned char skin; // also chooses cubemap for rtlights if lightpflags & LIGHTPFLAGS_FULLDYNAMIC
27         255,//unsigned char alpha;
28         16,//unsigned char scale;
29         0,//unsigned char glowsize;
30         254,//unsigned char glowcolor;
31         0,//unsigned char flags;
32         0,//unsigned char tagindex;
33         255,//unsigned char colormod;
34         // padding to a multiple of 8 bytes (to align the double time)
35         {0,0,0,0}//unsigned char unused[4]; // !
36 };
37
38 // keep track of quake entities because they need to be killed if they get stale
39 int cl_lastquakeentity = 0;
40 qbyte cl_isquakeentity[MAX_EDICTS];
41
42 void EntityFrameQuake_ReadEntity(int bits)
43 {
44         int num;
45         entity_t *ent;
46         entity_state_t s;
47
48         if (bits & U_MOREBITS)
49                 bits |= (MSG_ReadByte()<<8);
50         if ((bits & U_EXTEND1) && cl.protocol != PROTOCOL_NEHAHRAMOVIE)
51         {
52                 bits |= MSG_ReadByte() << 16;
53                 if (bits & U_EXTEND2)
54                         bits |= MSG_ReadByte() << 24;
55         }
56
57         if (bits & U_LONGENTITY)
58                 num = (unsigned short) MSG_ReadShort ();
59         else
60                 num = MSG_ReadByte ();
61
62         if (num >= MAX_EDICTS)
63                 Host_Error("EntityFrameQuake_ReadEntity: entity number (%i) >= MAX_EDICTS (%i)\n", num, MAX_EDICTS);
64         if (num < 1)
65                 Host_Error("EntityFrameQuake_ReadEntity: invalid entity number (%i)\n", num);
66
67         ent = cl_entities + num;
68
69         // note: this inherits the 'active' state of the baseline chosen
70         // (state_baseline is always active, state_current may not be active if
71         // the entity was missing in the last frame)
72         if (bits & U_DELTA)
73                 s = ent->state_current;
74         else
75         {
76                 s = ent->state_baseline;
77                 s.active = true;
78         }
79
80         cl_isquakeentity[num] = true;
81         if (cl_lastquakeentity < num)
82                 cl_lastquakeentity = num;
83         s.number = num;
84         s.time = cl.mtime[0];
85         s.flags = 0;
86         if (bits & U_MODEL)             s.modelindex = (s.modelindex & 0xFF00) | MSG_ReadByte();
87         if (bits & U_FRAME)             s.frame = (s.frame & 0xFF00) | MSG_ReadByte();
88         if (bits & U_COLORMAP)  s.colormap = MSG_ReadByte();
89         if (bits & U_SKIN)              s.skin = MSG_ReadByte();
90         if (bits & U_EFFECTS)   s.effects = (s.effects & 0xFF00) | MSG_ReadByte();
91         if (bits & U_ORIGIN1)   s.origin[0] = MSG_ReadCoord(cl.protocol);
92         if (bits & U_ANGLE1)    s.angles[0] = MSG_ReadAngle(cl.protocol);
93         if (bits & U_ORIGIN2)   s.origin[1] = MSG_ReadCoord(cl.protocol);
94         if (bits & U_ANGLE2)    s.angles[1] = MSG_ReadAngle(cl.protocol);
95         if (bits & U_ORIGIN3)   s.origin[2] = MSG_ReadCoord(cl.protocol);
96         if (bits & U_ANGLE3)    s.angles[2] = MSG_ReadAngle(cl.protocol);
97         if (bits & U_STEP)              s.flags |= RENDER_STEP;
98         if (bits & U_ALPHA)             s.alpha = MSG_ReadByte();
99         if (bits & U_SCALE)             s.scale = MSG_ReadByte();
100         if (bits & U_EFFECTS2)  s.effects = (s.effects & 0x00FF) | (MSG_ReadByte() << 8);
101         if (bits & U_GLOWSIZE)  s.glowsize = MSG_ReadByte();
102         if (bits & U_GLOWCOLOR) s.glowcolor = MSG_ReadByte();
103         if (bits & U_COLORMOD)  s.colormod = MSG_ReadByte();
104         if (bits & U_GLOWTRAIL) s.flags |= RENDER_GLOWTRAIL;
105         if (bits & U_FRAME2)    s.frame = (s.frame & 0x00FF) | (MSG_ReadByte() << 8);
106         if (bits & U_MODEL2)    s.modelindex = (s.modelindex & 0x00FF) | (MSG_ReadByte() << 8);
107         if (bits & U_VIEWMODEL) s.flags |= RENDER_VIEWMODEL;
108         if (bits & U_EXTERIORMODEL)     s.flags |= RENDER_EXTERIORMODEL;
109
110         // LordHavoc: to allow playback of the Nehahra movie
111         if (cl.protocol == PROTOCOL_NEHAHRAMOVIE && (bits & U_EXTEND1))
112         {
113                 // LordHavoc: evil format
114                 int i = MSG_ReadFloat();
115                 int j = MSG_ReadFloat() * 255.0f;
116                 if (i == 2)
117                 {
118                         i = MSG_ReadFloat();
119                         if (i)
120                                 s.effects |= EF_FULLBRIGHT;
121                 }
122                 if (j < 0)
123                         s.alpha = 0;
124                 else if (j == 0 || j >= 255)
125                         s.alpha = 255;
126                 else
127                         s.alpha = j;
128         }
129
130         ent->state_previous = ent->state_current;
131         ent->state_current = s;
132         if (ent->state_current.active)
133         {
134                 CL_MoveLerpEntityStates(ent);
135                 cl_entities_active[ent->state_current.number] = true;
136         }
137
138         if (msg_badread)
139                 Host_Error("EntityFrameQuake_ReadEntity: read error\n");
140 }
141
142 void EntityFrameQuake_ISeeDeadEntities(void)
143 {
144         int num, lastentity;
145         if (cl_lastquakeentity == 0)
146                 return;
147         lastentity = cl_lastquakeentity;
148         cl_lastquakeentity = 0;
149         for (num = 0;num < lastentity;num++)
150         {
151                 if (cl_isquakeentity[num])
152                 {
153                         cl_isquakeentity[num] = false;
154                         if (cl_entities_active[num])
155                         {
156                                 if (cl_entities[num].state_current.time == cl.mtime[0])
157                                 {
158                                         cl_isquakeentity[num] = true;
159                                         cl_lastquakeentity = num;
160                                 }
161                                 else
162                                 {
163                                         cl_isquakeentity[num] = false;
164                                         cl_entities_active[num] = false;
165                                         cl_entities[num].state_current = defaultstate;
166                                         cl_entities[num].state_current.number = num;
167                                 }
168                         }
169                 }
170         }
171 }
172
173 void EntityFrameQuake_WriteFrame(sizebuf_t *msg, int numstates, const entity_state_t *states)
174 {
175         const entity_state_t *s;
176         entity_state_t baseline;
177         int i, bits;
178         sizebuf_t buf;
179         qbyte data[128];
180
181         // prepare the buffer
182         memset(&buf, 0, sizeof(buf));
183         buf.data = data;
184         buf.maxsize = sizeof(data);
185
186         for (i = 0, s = states;i < numstates;i++, s++)
187         {
188                 // prepare the buffer
189                 SZ_Clear(&buf);
190
191 // send an update
192                 bits = 0;
193                 if (s->number >= 256)
194                         bits |= U_LONGENTITY;
195                 if (s->flags & RENDER_STEP)
196                         bits |= U_STEP;
197                 if (s->flags & RENDER_VIEWMODEL)
198                         bits |= U_VIEWMODEL;
199                 if (s->flags & RENDER_GLOWTRAIL)
200                         bits |= U_GLOWTRAIL;
201                 if (s->flags & RENDER_EXTERIORMODEL)
202                         bits |= U_EXTERIORMODEL;
203
204                 // LordHavoc: old stuff, but rewritten to have more exact tolerances
205                 baseline = sv.edicts[s->number].e->baseline;
206                 if (baseline.origin[0] != s->origin[0])
207                         bits |= U_ORIGIN1;
208                 if (baseline.origin[1] != s->origin[1])
209                         bits |= U_ORIGIN2;
210                 if (baseline.origin[2] != s->origin[2])
211                         bits |= U_ORIGIN3;
212                 if (baseline.angles[0] != s->angles[0])
213                         bits |= U_ANGLE1;
214                 if (baseline.angles[1] != s->angles[1])
215                         bits |= U_ANGLE2;
216                 if (baseline.angles[2] != s->angles[2])
217                         bits |= U_ANGLE3;
218                 if (baseline.colormap != s->colormap)
219                         bits |= U_COLORMAP;
220                 if (baseline.skin != s->skin)
221                         bits |= U_SKIN;
222                 if (baseline.frame != s->frame)
223                 {
224                         bits |= U_FRAME;
225                         if (s->frame & 0xFF00)
226                                 bits |= U_FRAME2;
227                 }
228                 if (baseline.effects != s->effects)
229                 {
230                         bits |= U_EFFECTS;
231                         if (s->effects & 0xFF00)
232                                 bits |= U_EFFECTS2;
233                 }
234                 if (baseline.modelindex != s->modelindex)
235                 {
236                         bits |= U_MODEL;
237                         if (s->modelindex & 0xFF00)
238                                 bits |= U_MODEL2;
239                 }
240                 if (baseline.alpha != s->alpha)
241                         bits |= U_ALPHA;
242                 if (baseline.scale != s->scale)
243                         bits |= U_SCALE;
244                 if (baseline.glowsize != s->glowsize)
245                         bits |= U_GLOWSIZE;
246                 if (baseline.glowcolor != s->glowcolor)
247                         bits |= U_GLOWCOLOR;
248
249                 // if extensions are disabled, clear the relevant update flags
250                 if (sv.netquakecompatible)
251                         bits &= 0x7FFF;
252
253                 // write the message
254                 if (bits >= 16777216)
255                         bits |= U_EXTEND2;
256                 if (bits >= 65536)
257                         bits |= U_EXTEND1;
258                 if (bits >= 256)
259                         bits |= U_MOREBITS;
260                 bits |= U_SIGNAL;
261
262                 MSG_WriteByte (&buf, bits);
263                 if (bits & U_MOREBITS)          MSG_WriteByte(&buf, bits>>8);
264                 if (bits & U_EXTEND1)           MSG_WriteByte(&buf, bits>>16);
265                 if (bits & U_EXTEND2)           MSG_WriteByte(&buf, bits>>24);
266                 if (bits & U_LONGENTITY)        MSG_WriteShort(&buf, s->number);
267                 else                                            MSG_WriteByte(&buf, s->number);
268
269                 if (bits & U_MODEL)                     MSG_WriteByte(&buf, s->modelindex);
270                 if (bits & U_FRAME)                     MSG_WriteByte(&buf, s->frame);
271                 if (bits & U_COLORMAP)          MSG_WriteByte(&buf, s->colormap);
272                 if (bits & U_SKIN)                      MSG_WriteByte(&buf, s->skin);
273                 if (bits & U_EFFECTS)           MSG_WriteByte(&buf, s->effects);
274                 if (bits & U_ORIGIN1)           MSG_WriteCoord(&buf, s->origin[0], sv.protocol);
275                 if (bits & U_ANGLE1)            MSG_WriteAngle(&buf, s->angles[0], sv.protocol);
276                 if (bits & U_ORIGIN2)           MSG_WriteCoord(&buf, s->origin[1], sv.protocol);
277                 if (bits & U_ANGLE2)            MSG_WriteAngle(&buf, s->angles[1], sv.protocol);
278                 if (bits & U_ORIGIN3)           MSG_WriteCoord(&buf, s->origin[2], sv.protocol);
279                 if (bits & U_ANGLE3)            MSG_WriteAngle(&buf, s->angles[2], sv.protocol);
280                 if (bits & U_ALPHA)                     MSG_WriteByte(&buf, s->alpha);
281                 if (bits & U_SCALE)                     MSG_WriteByte(&buf, s->scale);
282                 if (bits & U_EFFECTS2)          MSG_WriteByte(&buf, s->effects >> 8);
283                 if (bits & U_GLOWSIZE)          MSG_WriteByte(&buf, s->glowsize);
284                 if (bits & U_GLOWCOLOR)         MSG_WriteByte(&buf, s->glowcolor);
285                 if (bits & U_COLORMOD)          MSG_WriteByte(&buf, s->colormod);
286                 if (bits & U_FRAME2)            MSG_WriteByte(&buf, s->frame >> 8);
287                 if (bits & U_MODEL2)            MSG_WriteByte(&buf, s->modelindex >> 8);
288
289                 // if the commit is full, we're done this frame
290                 if (msg->cursize + buf.cursize > msg->maxsize)
291                 {
292                         // next frame we will continue where we left off
293                         break;
294                 }
295                 // write the message to the packet
296                 SZ_Write(msg, buf.data, buf.cursize);
297         }
298 }
299
300 int EntityState_DeltaBits(const entity_state_t *o, const entity_state_t *n)
301 {
302         unsigned int bits;
303         // if o is not active, delta from default
304         if (!o->active)
305                 o = &defaultstate;
306         bits = 0;
307         if (fabs(n->origin[0] - o->origin[0]) > (1.0f / 256.0f))
308                 bits |= E_ORIGIN1;
309         if (fabs(n->origin[1] - o->origin[1]) > (1.0f / 256.0f))
310                 bits |= E_ORIGIN2;
311         if (fabs(n->origin[2] - o->origin[2]) > (1.0f / 256.0f))
312                 bits |= E_ORIGIN3;
313         if ((qbyte) (n->angles[0] * (256.0f / 360.0f)) != (qbyte) (o->angles[0] * (256.0f / 360.0f)))
314                 bits |= E_ANGLE1;
315         if ((qbyte) (n->angles[1] * (256.0f / 360.0f)) != (qbyte) (o->angles[1] * (256.0f / 360.0f)))
316                 bits |= E_ANGLE2;
317         if ((qbyte) (n->angles[2] * (256.0f / 360.0f)) != (qbyte) (o->angles[2] * (256.0f / 360.0f)))
318                 bits |= E_ANGLE3;
319         if ((n->modelindex ^ o->modelindex) & 0x00FF)
320                 bits |= E_MODEL1;
321         if ((n->modelindex ^ o->modelindex) & 0xFF00)
322                 bits |= E_MODEL2;
323         if ((n->frame ^ o->frame) & 0x00FF)
324                 bits |= E_FRAME1;
325         if ((n->frame ^ o->frame) & 0xFF00)
326                 bits |= E_FRAME2;
327         if ((n->effects ^ o->effects) & 0x00FF)
328                 bits |= E_EFFECTS1;
329         if ((n->effects ^ o->effects) & 0xFF00)
330                 bits |= E_EFFECTS2;
331         if (n->colormap != o->colormap)
332                 bits |= E_COLORMAP;
333         if (n->skin != o->skin)
334                 bits |= E_SKIN;
335         if (n->alpha != o->alpha)
336                 bits |= E_ALPHA;
337         if (n->scale != o->scale)
338                 bits |= E_SCALE;
339         if (n->glowsize != o->glowsize)
340                 bits |= E_GLOWSIZE;
341         if (n->glowcolor != o->glowcolor)
342                 bits |= E_GLOWCOLOR;
343         if (n->flags != o->flags)
344                 bits |= E_FLAGS;
345         if (n->tagindex != o->tagindex || n->tagentity != o->tagentity)
346                 bits |= E_TAGATTACHMENT;
347         if (n->light[0] != o->light[0] || n->light[1] != o->light[1] || n->light[2] != o->light[2] || n->light[3] != o->light[3])
348                 bits |= E_LIGHT;
349         if (n->lightstyle != o->lightstyle)
350                 bits |= E_LIGHTSTYLE;
351         if (n->lightpflags != o->lightpflags)
352                 bits |= E_LIGHTPFLAGS;
353
354         if (bits)
355         {
356                 if (bits &  0xFF000000)
357                         bits |= 0x00800000;
358                 if (bits &  0x00FF0000)
359                         bits |= 0x00008000;
360                 if (bits &  0x0000FF00)
361                         bits |= 0x00000080;
362         }
363         return bits;
364 }
365
366 void EntityState_WriteExtendBits(sizebuf_t *msg, unsigned int bits)
367 {
368         MSG_WriteByte(msg, bits & 0xFF);
369         if (bits & 0x00000080)
370         {
371                 MSG_WriteByte(msg, (bits >> 8) & 0xFF);
372                 if (bits & 0x00008000)
373                 {
374                         MSG_WriteByte(msg, (bits >> 16) & 0xFF);
375                         if (bits & 0x00800000)
376                                 MSG_WriteByte(msg, (bits >> 24) & 0xFF);
377                 }
378         }
379 }
380
381 void EntityState_WriteFields(const entity_state_t *ent, sizebuf_t *msg, unsigned int bits)
382 {
383         if (sv.protocol == PROTOCOL_DARKPLACES2)
384         {
385                 if (bits & E_ORIGIN1)
386                         MSG_WriteCoord16i(msg, ent->origin[0]);
387                 if (bits & E_ORIGIN2)
388                         MSG_WriteCoord16i(msg, ent->origin[1]);
389                 if (bits & E_ORIGIN3)
390                         MSG_WriteCoord16i(msg, ent->origin[2]);
391         }
392         else if (sv.protocol == PROTOCOL_DARKPLACES1 || sv.protocol == PROTOCOL_DARKPLACES3 || sv.protocol == PROTOCOL_DARKPLACES4 || sv.protocol == PROTOCOL_DARKPLACES5)
393         {
394                 // LordHavoc: have to write flags first, as they can modify protocol
395                 if (bits & E_FLAGS)
396                         MSG_WriteByte(msg, ent->flags);
397                 if (ent->flags & RENDER_LOWPRECISION)
398                 {
399                         if (bits & E_ORIGIN1)
400                                 MSG_WriteCoord16i(msg, ent->origin[0]);
401                         if (bits & E_ORIGIN2)
402                                 MSG_WriteCoord16i(msg, ent->origin[1]);
403                         if (bits & E_ORIGIN3)
404                                 MSG_WriteCoord16i(msg, ent->origin[2]);
405                 }
406                 else
407                 {
408                         if (bits & E_ORIGIN1)
409                                 MSG_WriteCoord32f(msg, ent->origin[0]);
410                         if (bits & E_ORIGIN2)
411                                 MSG_WriteCoord32f(msg, ent->origin[1]);
412                         if (bits & E_ORIGIN3)
413                                 MSG_WriteCoord32f(msg, ent->origin[2]);
414                 }
415         }
416         if (sv.protocol == PROTOCOL_DARKPLACES5 && !(ent->flags & RENDER_LOWPRECISION))
417         {
418                 if (bits & E_ANGLE1)
419                         MSG_WriteAngle16i(msg, ent->angles[0]);
420                 if (bits & E_ANGLE2)
421                         MSG_WriteAngle16i(msg, ent->angles[1]);
422                 if (bits & E_ANGLE3)
423                         MSG_WriteAngle16i(msg, ent->angles[2]);
424         }
425         else
426         {
427                 if (bits & E_ANGLE1)
428                         MSG_WriteAngle8i(msg, ent->angles[0]);
429                 if (bits & E_ANGLE2)
430                         MSG_WriteAngle8i(msg, ent->angles[1]);
431                 if (bits & E_ANGLE3)
432                         MSG_WriteAngle8i(msg, ent->angles[2]);
433         }
434         if (bits & E_MODEL1)
435                 MSG_WriteByte(msg, ent->modelindex & 0xFF);
436         if (bits & E_MODEL2)
437                 MSG_WriteByte(msg, (ent->modelindex >> 8) & 0xFF);
438         if (bits & E_FRAME1)
439                 MSG_WriteByte(msg, ent->frame & 0xFF);
440         if (bits & E_FRAME2)
441                 MSG_WriteByte(msg, (ent->frame >> 8) & 0xFF);
442         if (bits & E_EFFECTS1)
443                 MSG_WriteByte(msg, ent->effects & 0xFF);
444         if (bits & E_EFFECTS2)
445                 MSG_WriteByte(msg, (ent->effects >> 8) & 0xFF);
446         if (bits & E_COLORMAP)
447                 MSG_WriteByte(msg, ent->colormap);
448         if (bits & E_SKIN)
449                 MSG_WriteByte(msg, ent->skin);
450         if (bits & E_ALPHA)
451                 MSG_WriteByte(msg, ent->alpha);
452         if (bits & E_SCALE)
453                 MSG_WriteByte(msg, ent->scale);
454         if (bits & E_GLOWSIZE)
455                 MSG_WriteByte(msg, ent->glowsize);
456         if (bits & E_GLOWCOLOR)
457                 MSG_WriteByte(msg, ent->glowcolor);
458         if (sv.protocol == PROTOCOL_DARKPLACES2)
459                 if (bits & E_FLAGS)
460                         MSG_WriteByte(msg, ent->flags);
461         if (bits & E_TAGATTACHMENT)
462         {
463                 MSG_WriteShort(msg, ent->tagentity);
464                 MSG_WriteByte(msg, ent->tagindex);
465         }
466         if (bits & E_LIGHT)
467         {
468                 MSG_WriteShort(msg, ent->light[0]);
469                 MSG_WriteShort(msg, ent->light[1]);
470                 MSG_WriteShort(msg, ent->light[2]);
471                 MSG_WriteShort(msg, ent->light[3]);
472         }
473         if (bits & E_LIGHTSTYLE)
474                 MSG_WriteByte(msg, ent->lightstyle);
475         if (bits & E_LIGHTPFLAGS)
476                 MSG_WriteByte(msg, ent->lightpflags);
477 }
478
479 void EntityState_WriteUpdate(const entity_state_t *ent, sizebuf_t *msg, const entity_state_t *delta)
480 {
481         unsigned int bits;
482         if (ent->active)
483         {
484                 // entity is active, check for changes from the delta
485                 if ((bits = EntityState_DeltaBits(delta, ent)))
486                 {
487                         // write the update number, bits, and fields
488                         MSG_WriteShort(msg, ent->number);
489                         EntityState_WriteExtendBits(msg, bits);
490                         EntityState_WriteFields(ent, msg, bits);
491                 }
492         }
493         else
494         {
495                 // entity is inactive, check if the delta was active
496                 if (delta->active)
497                 {
498                         // write the remove number
499                         MSG_WriteShort(msg, ent->number | 0x8000);
500                 }
501         }
502 }
503
504 int EntityState_ReadExtendBits(void)
505 {
506         unsigned int bits;
507         bits = MSG_ReadByte();
508         if (bits & 0x00000080)
509         {
510                 bits |= MSG_ReadByte() << 8;
511                 if (bits & 0x00008000)
512                 {
513                         bits |= MSG_ReadByte() << 16;
514                         if (bits & 0x00800000)
515                                 bits |= MSG_ReadByte() << 24;
516                 }
517         }
518         return bits;
519 }
520
521 void EntityState_ReadFields(entity_state_t *e, unsigned int bits)
522 {
523         if (cl.protocol == PROTOCOL_DARKPLACES2)
524         {
525                 if (bits & E_ORIGIN1)
526                         e->origin[0] = MSG_ReadCoord16i();
527                 if (bits & E_ORIGIN2)
528                         e->origin[1] = MSG_ReadCoord16i();
529                 if (bits & E_ORIGIN3)
530                         e->origin[2] = MSG_ReadCoord16i();
531         }
532         else if (cl.protocol == PROTOCOL_DARKPLACES1 || cl.protocol == PROTOCOL_DARKPLACES3 || cl.protocol == PROTOCOL_DARKPLACES4 || cl.protocol == PROTOCOL_DARKPLACES5)
533         {
534                 if (bits & E_FLAGS)
535                         e->flags = MSG_ReadByte();
536                 if (e->flags & RENDER_LOWPRECISION)
537                 {
538                         if (bits & E_ORIGIN1)
539                                 e->origin[0] = MSG_ReadCoord16i();
540                         if (bits & E_ORIGIN2)
541                                 e->origin[1] = MSG_ReadCoord16i();
542                         if (bits & E_ORIGIN3)
543                                 e->origin[2] = MSG_ReadCoord16i();
544                 }
545                 else
546                 {
547                         if (bits & E_ORIGIN1)
548                                 e->origin[0] = MSG_ReadCoord32f();
549                         if (bits & E_ORIGIN2)
550                                 e->origin[1] = MSG_ReadCoord32f();
551                         if (bits & E_ORIGIN3)
552                                 e->origin[2] = MSG_ReadCoord32f();
553                 }
554         }
555         if (cl.protocol == PROTOCOL_DARKPLACES5 && !(e->flags & RENDER_LOWPRECISION))
556         {
557                 if (bits & E_ANGLE1)
558                         e->angles[0] = MSG_ReadAngle16i();
559                 if (bits & E_ANGLE2)
560                         e->angles[1] = MSG_ReadAngle16i();
561                 if (bits & E_ANGLE3)
562                         e->angles[2] = MSG_ReadAngle16i();
563         }
564         else
565         {
566                 if (bits & E_ANGLE1)
567                         e->angles[0] = MSG_ReadAngle8i();
568                 if (bits & E_ANGLE2)
569                         e->angles[1] = MSG_ReadAngle8i();
570                 if (bits & E_ANGLE3)
571                         e->angles[2] = MSG_ReadAngle8i();
572         }
573         if (bits & E_MODEL1)
574                 e->modelindex = (e->modelindex & 0xFF00) | (unsigned int) MSG_ReadByte();
575         if (bits & E_MODEL2)
576                 e->modelindex = (e->modelindex & 0x00FF) | ((unsigned int) MSG_ReadByte() << 8);
577         if (bits & E_FRAME1)
578                 e->frame = (e->frame & 0xFF00) | (unsigned int) MSG_ReadByte();
579         if (bits & E_FRAME2)
580                 e->frame = (e->frame & 0x00FF) | ((unsigned int) MSG_ReadByte() << 8);
581         if (bits & E_EFFECTS1)
582                 e->effects = (e->effects & 0xFF00) | (unsigned int) MSG_ReadByte();
583         if (bits & E_EFFECTS2)
584                 e->effects = (e->effects & 0x00FF) | ((unsigned int) MSG_ReadByte() << 8);
585         if (bits & E_COLORMAP)
586                 e->colormap = MSG_ReadByte();
587         if (bits & E_SKIN)
588                 e->skin = MSG_ReadByte();
589         if (bits & E_ALPHA)
590                 e->alpha = MSG_ReadByte();
591         if (bits & E_SCALE)
592                 e->scale = MSG_ReadByte();
593         if (bits & E_GLOWSIZE)
594                 e->glowsize = MSG_ReadByte();
595         if (bits & E_GLOWCOLOR)
596                 e->glowcolor = MSG_ReadByte();
597         if (cl.protocol == PROTOCOL_DARKPLACES2)
598                 if (bits & E_FLAGS)
599                         e->flags = MSG_ReadByte();
600         if (bits & E_TAGATTACHMENT)
601         {
602                 e->tagentity = (unsigned short) MSG_ReadShort();
603                 e->tagindex = MSG_ReadByte();
604         }
605         if (bits & E_LIGHT)
606         {
607                 e->light[0] = (unsigned short) MSG_ReadShort();
608                 e->light[1] = (unsigned short) MSG_ReadShort();
609                 e->light[2] = (unsigned short) MSG_ReadShort();
610                 e->light[3] = (unsigned short) MSG_ReadShort();
611         }
612         if (bits & E_LIGHTSTYLE)
613                 e->lightstyle = MSG_ReadByte();
614         if (bits & E_LIGHTPFLAGS)
615                 e->lightpflags = MSG_ReadByte();
616
617         if (developer_networkentities.integer >= 2)
618         {
619                 Con_Printf("ReadFields e%i", e->number);
620
621                 if (bits & E_ORIGIN1)
622                         Con_Printf(" E_ORIGIN1 %f", e->origin[0]);
623                 if (bits & E_ORIGIN2)
624                         Con_Printf(" E_ORIGIN2 %f", e->origin[1]);
625                 if (bits & E_ORIGIN3)
626                         Con_Printf(" E_ORIGIN3 %f", e->origin[2]);
627                 if (bits & E_ANGLE1)
628                         Con_Printf(" E_ANGLE1 %f", e->angles[0]);
629                 if (bits & E_ANGLE2)
630                         Con_Printf(" E_ANGLE2 %f", e->angles[1]);
631                 if (bits & E_ANGLE3)
632                         Con_Printf(" E_ANGLE3 %f", e->angles[2]);
633                 if (bits & (E_MODEL1 | E_MODEL2))
634                         Con_Printf(" E_MODEL %i", e->modelindex);
635
636                 if (bits & (E_FRAME1 | E_FRAME2))
637                         Con_Printf(" E_FRAME %i", e->frame);
638                 if (bits & (E_EFFECTS1 | E_EFFECTS2))
639                         Con_Printf(" E_EFFECTS %i", e->effects);
640                 if (bits & E_ALPHA)
641                         Con_Printf(" E_ALPHA %f", e->alpha / 255.0f);
642                 if (bits & E_SCALE)
643                         Con_Printf(" E_SCALE %f", e->scale / 16.0f);
644                 if (bits & E_COLORMAP)
645                         Con_Printf(" E_COLORMAP %i", e->colormap);
646                 if (bits & E_SKIN)
647                         Con_Printf(" E_SKIN %i", e->skin);
648
649                 if (bits & E_GLOWSIZE)
650                         Con_Printf(" E_GLOWSIZE %i", e->glowsize * 4);
651                 if (bits & E_GLOWCOLOR)
652                         Con_Printf(" E_GLOWCOLOR %i", e->glowcolor);
653                 
654                 if (bits & E_LIGHT)
655                         Con_Printf(" E_LIGHT %i:%i:%i:%i", e->light[0], e->light[1], e->light[2], e->light[3]);
656                 if (bits & E_LIGHTPFLAGS)                       
657                         Con_Printf(" E_LIGHTPFLAGS %i", e->lightpflags);
658
659                 if (bits & E_TAGATTACHMENT)
660                         Con_Printf(" E_TAGATTACHMENT e%i:%i", e->tagentity, e->tagindex);
661                 if (bits & E_LIGHTSTYLE)
662                         Con_Printf(" E_LIGHTSTYLE %i", e->lightstyle);
663                 Con_Print("\n");
664         }
665 }
666
667 // (client and server) allocates a new empty database
668 entityframe_database_t *EntityFrame_AllocDatabase(mempool_t *mempool)
669 {
670         return Mem_Alloc(mempool, sizeof(entityframe_database_t));
671 }
672
673 // (client and server) frees the database
674 void EntityFrame_FreeDatabase(entityframe_database_t *d)
675 {
676         Mem_Free(d);
677 }
678
679 // (server) clears the database to contain no frames (thus delta compression compresses against nothing)
680 void EntityFrame_ClearDatabase(entityframe_database_t *d)
681 {
682         memset(d, 0, sizeof(*d));
683 }
684
685 // (server and client) removes frames older than 'frame' from database
686 void EntityFrame_AckFrame(entityframe_database_t *d, int frame)
687 {
688         int i;
689         if (d->ackframenum < frame)
690                 d->ackframenum = frame;
691         for (i = 0;i < d->numframes && d->frames[i].framenum < frame;i++);
692         // ignore outdated frame acks (out of order packets)
693         if (i == 0)
694                 return;
695         d->numframes -= i;
696         // if some queue is left, slide it down to beginning of array
697         if (d->numframes)
698                 memmove(&d->frames[0], &d->frames[i], sizeof(d->frames[0]) * d->numframes);
699 }
700
701 // (server) clears frame, to prepare for adding entities
702 void EntityFrame_Clear(entity_frame_t *f, vec3_t eye, int framenum)
703 {
704         f->time = 0;
705         f->framenum = framenum;
706         f->numentities = 0;
707         if (eye == NULL)
708                 VectorClear(f->eye);
709         else
710                 VectorCopy(eye, f->eye);
711 }
712
713 // (server and client) reads a frame from the database
714 void EntityFrame_FetchFrame(entityframe_database_t *d, int framenum, entity_frame_t *f)
715 {
716         int i, n;
717         EntityFrame_Clear(f, NULL, -1);
718         for (i = 0;i < d->numframes && d->frames[i].framenum < framenum;i++);
719         if (i < d->numframes && framenum == d->frames[i].framenum)
720         {
721                 f->framenum = framenum;
722                 f->numentities = d->frames[i].endentity - d->frames[i].firstentity;
723                 n = MAX_ENTITY_DATABASE - (d->frames[i].firstentity % MAX_ENTITY_DATABASE);
724                 if (n > f->numentities)
725                         n = f->numentities;
726                 memcpy(f->entitydata, d->entitydata + d->frames[i].firstentity % MAX_ENTITY_DATABASE, sizeof(*f->entitydata) * n);
727                 if (f->numentities > n)
728                         memcpy(f->entitydata + n, d->entitydata, sizeof(*f->entitydata) * (f->numentities - n));
729                 VectorCopy(d->eye, f->eye);
730         }
731 }
732
733 // (server and client) adds a entity_frame to the database, for future reference
734 void EntityFrame_AddFrame(entityframe_database_t *d, vec3_t eye, int framenum, int numentities, const entity_state_t *entitydata)
735 {
736         int n, e;
737         entity_frameinfo_t *info;
738
739         VectorCopy(eye, d->eye);
740
741         // figure out how many entity slots are used already
742         if (d->numframes)
743         {
744                 n = d->frames[d->numframes - 1].endentity - d->frames[0].firstentity;
745                 if (n + numentities > MAX_ENTITY_DATABASE || d->numframes >= MAX_ENTITY_HISTORY)
746                 {
747                         // ran out of room, dump database
748                         EntityFrame_ClearDatabase(d);
749                 }
750         }
751
752         info = &d->frames[d->numframes];
753         info->framenum = framenum;
754         e = -1000;
755         // make sure we check the newly added frame as well, but we haven't incremented numframes yet
756         for (n = 0;n <= d->numframes;n++)
757         {
758                 if (e >= d->frames[n].framenum)
759                 {
760                         if (e == framenum)
761                                 Con_Print("EntityFrame_AddFrame: tried to add out of sequence frame to database\n");
762                         else
763                                 Con_Print("EntityFrame_AddFrame: out of sequence frames in database\n");
764                         return;
765                 }
766                 e = d->frames[n].framenum;
767         }
768         // if database still has frames after that...
769         if (d->numframes)
770                 info->firstentity = d->frames[d->numframes - 1].endentity;
771         else
772                 info->firstentity = 0;
773         info->endentity = info->firstentity + numentities;
774         d->numframes++;
775
776         n = info->firstentity % MAX_ENTITY_DATABASE;
777         e = MAX_ENTITY_DATABASE - n;
778         if (e > numentities)
779                 e = numentities;
780         memcpy(d->entitydata + n, entitydata, sizeof(entity_state_t) * e);
781         if (numentities > e)
782                 memcpy(d->entitydata, entitydata + e, sizeof(entity_state_t) * (numentities - e));
783 }
784
785 // (server) writes a frame to network stream
786 static entity_frame_t deltaframe; // FIXME?
787 void EntityFrame_WriteFrame(sizebuf_t *msg, entityframe_database_t *d, int numstates, const entity_state_t *states, int viewentnum)
788 {
789         int i, onum, number;
790         entity_frame_t *o = &deltaframe;
791         const entity_state_t *ent, *delta;
792         vec3_t eye;
793
794         d->latestframenum++;
795
796         VectorClear(eye);
797         for (i = 0;i < numstates;i++)
798         {
799                 if (states[i].number == viewentnum)
800                 {
801                         VectorSet(eye, states[i].origin[0], states[i].origin[1], states[i].origin[2] + 22);
802                         break;
803                 }
804         }
805
806         EntityFrame_AddFrame(d, eye, d->latestframenum, numstates, states);
807
808         EntityFrame_FetchFrame(d, d->ackframenum > 0 ? d->ackframenum : -1, o);
809
810         MSG_WriteByte (msg, svc_entities);
811         MSG_WriteLong (msg, o->framenum);
812         MSG_WriteLong (msg, d->latestframenum);
813         MSG_WriteFloat (msg, eye[0]);
814         MSG_WriteFloat (msg, eye[1]);
815         MSG_WriteFloat (msg, eye[2]);
816
817         onum = 0;
818         for (i = 0;i < numstates;i++)
819         {
820                 ent = states + i;
821                 number = ent->number;
822                 for (;onum < o->numentities && o->entitydata[onum].number < number;onum++)
823                 {
824                         // write remove message
825                         MSG_WriteShort(msg, o->entitydata[onum].number | 0x8000);
826                 }
827                 if (onum < o->numentities && (o->entitydata[onum].number == number))
828                 {
829                         // delta from previous frame
830                         delta = o->entitydata + onum;
831                         // advance to next entity in delta frame
832                         onum++;
833                 }
834                 else
835                 {
836                         // delta from defaults
837                         delta = &defaultstate;
838                 }
839                 EntityState_WriteUpdate(ent, msg, delta);
840         }
841         for (;onum < o->numentities;onum++)
842         {
843                 // write remove message
844                 MSG_WriteShort(msg, o->entitydata[onum].number | 0x8000);
845         }
846         MSG_WriteShort(msg, 0xFFFF);
847 }
848
849 // (client) reads a frame from network stream
850 static entity_frame_t framedata; // FIXME?
851 void EntityFrame_CL_ReadFrame(void)
852 {
853         int i, number, removed;
854         entity_frame_t *f = &framedata, *delta = &deltaframe;
855         entity_state_t *e, *old, *oldend;
856         entity_t *ent;
857         entityframe_database_t *d;
858         if (!cl.entitydatabase)
859                 cl.entitydatabase = EntityFrame_AllocDatabase(cl_entities_mempool);
860         d = cl.entitydatabase;
861
862         EntityFrame_Clear(f, NULL, -1);
863
864         // read the frame header info
865         f->time = cl.mtime[0];
866         number = MSG_ReadLong();
867         f->framenum = MSG_ReadLong();
868         f->eye[0] = MSG_ReadFloat();
869         f->eye[1] = MSG_ReadFloat();
870         f->eye[2] = MSG_ReadFloat();
871         EntityFrame_AckFrame(d, number);
872         EntityFrame_FetchFrame(d, number, delta);
873         old = delta->entitydata;
874         oldend = old + delta->numentities;
875         // read entities until we hit the magic 0xFFFF end tag
876         while ((number = (unsigned short) MSG_ReadShort()) != 0xFFFF && !msg_badread)
877         {
878                 if (msg_badread)
879                         Host_Error("EntityFrame_Read: read error\n");
880                 removed = number & 0x8000;
881                 number &= 0x7FFF;
882                 if (number >= MAX_EDICTS)
883                         Host_Error("EntityFrame_Read: number (%i) >= MAX_EDICTS (%i)\n", number, MAX_EDICTS);
884
885                 // seek to entity, while copying any skipped entities (assume unchanged)
886                 while (old < oldend && old->number < number)
887                 {
888                         if (f->numentities >= MAX_ENTITY_DATABASE)
889                                 Host_Error("EntityFrame_Read: entity list too big\n");
890                         f->entitydata[f->numentities] = *old++;
891                         f->entitydata[f->numentities++].time = cl.mtime[0];
892                 }
893                 if (removed)
894                 {
895                         if (old < oldend && old->number == number)
896                                 old++;
897                         else
898                                 Con_Printf("EntityFrame_Read: REMOVE on unused entity %i\n", number);
899                 }
900                 else
901                 {
902                         if (f->numentities >= MAX_ENTITY_DATABASE)
903                                 Host_Error("EntityFrame_Read: entity list too big\n");
904
905                         // reserve this slot
906                         e = f->entitydata + f->numentities++;
907
908                         if (old < oldend && old->number == number)
909                         {
910                                 // delta from old entity
911                                 *e = *old++;
912                         }
913                         else
914                         {
915                                 // delta from defaults
916                                 *e = defaultstate;
917                         }
918
919                         cl_entities_active[number] = true;
920                         e->active = true;
921                         e->time = cl.mtime[0];
922                         e->number = number;
923                         EntityState_ReadFields(e, EntityState_ReadExtendBits());
924                 }
925         }
926         while (old < oldend)
927         {
928                 if (f->numentities >= MAX_ENTITY_DATABASE)
929                         Host_Error("EntityFrame_Read: entity list too big\n");
930                 f->entitydata[f->numentities] = *old++;
931                 f->entitydata[f->numentities++].time = cl.mtime[0];
932         }
933         EntityFrame_AddFrame(d, f->eye, f->framenum, f->numentities, f->entitydata);
934
935         memset(cl_entities_active, 0, cl_max_entities * sizeof(qbyte));
936         number = 1;
937         for (i = 0;i < f->numentities;i++)
938         {
939                 for (;number < f->entitydata[i].number;number++)
940                 {
941                         if (cl_entities_active[number])
942                         {
943                                 cl_entities_active[number] = false;
944                                 cl_entities[number].state_current.active = false;
945                         }
946                 }
947                 // update the entity
948                 ent = &cl_entities[number];
949                 ent->state_previous = ent->state_current;
950                 ent->state_current = f->entitydata[i];
951                 CL_MoveLerpEntityStates(ent);
952                 // the entity lives again...
953                 cl_entities_active[number] = true;
954                 number++;
955         }
956         for (;number < cl_max_entities;number++)
957         {
958                 if (cl_entities_active[number])
959                 {
960                         cl_entities_active[number] = false;
961                         cl_entities[number].state_current.active = false;
962                 }
963         }
964 }
965
966
967 // (client) returns the frame number of the most recent frame recieved
968 int EntityFrame_MostRecentlyRecievedFrameNum(entityframe_database_t *d)
969 {
970         if (d->numframes)
971                 return d->frames[d->numframes - 1].framenum;
972         else
973                 return -1;
974 }
975
976
977
978
979
980
981 entity_state_t *EntityFrame4_GetReferenceEntity(entityframe4_database_t *d, int number)
982 {
983         if (d->maxreferenceentities <= number)
984         {
985                 int oldmax = d->maxreferenceentities;
986                 entity_state_t *oldentity = d->referenceentity;
987                 d->maxreferenceentities = (number + 15) & ~7;
988                 d->referenceentity = Mem_Alloc(d->mempool, d->maxreferenceentities * sizeof(*d->referenceentity));
989                 if (oldentity)
990                 {
991                         memcpy(d->referenceentity, oldentity, oldmax * sizeof(*d->referenceentity));
992                         Mem_Free(oldentity);
993                 }
994                 // clear the newly created entities
995                 for (;oldmax < d->maxreferenceentities;oldmax++)
996                 {
997                         d->referenceentity[oldmax] = defaultstate;
998                         d->referenceentity[oldmax].number = oldmax;
999                 }
1000         }
1001         return d->referenceentity + number;
1002 }
1003
1004 void EntityFrame4_AddCommitEntity(entityframe4_database_t *d, const entity_state_t *s)
1005 {
1006         // resize commit's entity list if full
1007         if (d->currentcommit->maxentities <= d->currentcommit->numentities)
1008         {
1009                 entity_state_t *oldentity = d->currentcommit->entity;
1010                 d->currentcommit->maxentities += 8;
1011                 d->currentcommit->entity = Mem_Alloc(d->mempool, d->currentcommit->maxentities * sizeof(*d->currentcommit->entity));
1012                 if (oldentity)
1013                 {
1014                         memcpy(d->currentcommit->entity, oldentity, d->currentcommit->numentities * sizeof(*d->currentcommit->entity));
1015                         Mem_Free(oldentity);
1016                 }
1017         }
1018         d->currentcommit->entity[d->currentcommit->numentities++] = *s;
1019 }
1020
1021 entityframe4_database_t *EntityFrame4_AllocDatabase(mempool_t *pool)
1022 {
1023         entityframe4_database_t *d;
1024         d = Mem_Alloc(pool, sizeof(*d));
1025         d->mempool = pool;
1026         EntityFrame4_ResetDatabase(d);
1027         d->ackframenum = -1;
1028         return d;
1029 }
1030
1031 void EntityFrame4_FreeDatabase(entityframe4_database_t *d)
1032 {
1033         int i;
1034         for (i = 0;i < MAX_ENTITY_HISTORY;i++)
1035                 if (d->commit[i].entity)
1036                         Mem_Free(d->commit[i].entity);
1037         if (d->referenceentity)
1038                 Mem_Free(d->referenceentity);
1039         Mem_Free(d);
1040 }
1041
1042 void EntityFrame4_ResetDatabase(entityframe4_database_t *d)
1043 {
1044         int i;
1045         d->ackframenum = -1;
1046         d->referenceframenum = -1;
1047         for (i = 0;i < MAX_ENTITY_HISTORY;i++)
1048                 d->commit[i].numentities = 0;
1049         for (i = 0;i < d->maxreferenceentities;i++)
1050                 d->referenceentity[i] = defaultstate;
1051 }
1052
1053 int EntityFrame4_AckFrame(entityframe4_database_t *d, int framenum)
1054 {
1055         int i, j, found;
1056         entity_database4_commit_t *commit;
1057         if (framenum == -1)
1058         {
1059                 // reset reference, but leave commits alone
1060                 d->referenceframenum = -1;
1061                 for (i = 0;i < d->maxreferenceentities;i++)
1062                         d->referenceentity[i] = defaultstate;
1063                 found = true;
1064         }
1065         else if (d->referenceframenum == framenum)
1066                 found = true;
1067         else
1068         {
1069                 found = false;
1070                 for (i = 0, commit = d->commit;i < MAX_ENTITY_HISTORY;i++, commit++)
1071                 {
1072                         if (commit->numentities && commit->framenum <= framenum)
1073                         {
1074                                 if (commit->framenum == framenum)
1075                                 {
1076                                         found = true;
1077                                         d->referenceframenum = framenum;
1078                                         if (developer_networkentities.integer >= 3)
1079                                         {
1080                                                 for (j = 0;j < commit->numentities;j++)
1081                                                 {
1082                                                         entity_state_t *s = EntityFrame4_GetReferenceEntity(d, commit->entity[j].number);
1083                                                         if (commit->entity[j].active != s->active)
1084                                                         {
1085                                                                 if (commit->entity[j].active)
1086                                                                         Con_Printf("commit entity %i has become active (modelindex %i)\n", commit->entity[j].number, commit->entity[j].modelindex);
1087                                                                 else
1088                                                                         Con_Printf("commit entity %i has become inactive (modelindex %i)\n", commit->entity[j].number, commit->entity[j].modelindex);
1089                                                         }
1090                                                         *s = commit->entity[j];
1091                                                 }
1092                                         }
1093                                         else
1094                                                 for (j = 0;j < commit->numentities;j++)
1095                                                         *EntityFrame4_GetReferenceEntity(d, commit->entity[j].number) = commit->entity[j];
1096                                 }
1097                                 commit->numentities = 0;
1098                         }
1099                 }
1100         }
1101         if (developer_networkentities.integer >= 1)
1102         {
1103                 Con_Printf("ack ref:%i database updated to: ref:%i commits:", framenum, d->referenceframenum);
1104                 for (i = 0;i < MAX_ENTITY_HISTORY;i++)
1105                         if (d->commit[i].numentities)
1106                                 Con_Printf(" %i", d->commit[i].framenum);
1107                 Con_Print("\n");
1108         }
1109         return found;
1110 }
1111
1112 void EntityFrame4_CL_ReadFrame(void)
1113 {
1114         int i, n, cnumber, referenceframenum, framenum, enumber, done, stopnumber, skip = false;
1115         entity_state_t *s;
1116         entityframe4_database_t *d;
1117         if (!cl.entitydatabase4)
1118                 cl.entitydatabase4 = EntityFrame4_AllocDatabase(cl_entities_mempool);
1119         d = cl.entitydatabase4;
1120         // read the number of the frame this refers to
1121         referenceframenum = MSG_ReadLong();
1122         // read the number of this frame
1123         framenum = MSG_ReadLong();
1124         // read the start number
1125         enumber = (unsigned short) MSG_ReadShort();
1126         if (developer_networkentities.integer >= 1)
1127         {
1128                 Con_Printf("recv svc_entities num:%i ref:%i database: ref:%i commits:", framenum, referenceframenum, d->referenceframenum);
1129                 for (i = 0;i < MAX_ENTITY_HISTORY;i++)
1130                         if (d->commit[i].numentities)
1131                                 Con_Printf(" %i", d->commit[i].framenum);
1132                 Con_Print("\n");
1133         }
1134         if (!EntityFrame4_AckFrame(d, referenceframenum))
1135         {
1136                 Con_Print("EntityFrame4_CL_ReadFrame: reference frame invalid (VERY BAD ERROR), this update will be skipped\n");
1137                 skip = true;
1138         }
1139         d->currentcommit = NULL;
1140         for (i = 0;i < MAX_ENTITY_HISTORY;i++)
1141         {
1142                 if (!d->commit[i].numentities)
1143                 {
1144                         d->currentcommit = d->commit + i;
1145                         d->currentcommit->framenum = d->ackframenum = framenum;
1146                         d->currentcommit->numentities = 0;
1147                 }
1148         }
1149         if (d->currentcommit == NULL)
1150         {
1151                 Con_Printf("EntityFrame4_CL_ReadFrame: error while decoding frame %i: database full, reading but not storing this update\n", framenum);
1152                 skip = true;
1153         }
1154         done = false;
1155         while (!done && !msg_badread)
1156         {
1157                 // read the number of the modified entity
1158                 // (gaps will be copied unmodified)
1159                 n = (unsigned short)MSG_ReadShort();
1160                 if (n == 0x8000)
1161                 {
1162                         // no more entities in this update, but we still need to copy the
1163                         // rest of the reference entities (final gap)
1164                         done = true;
1165                         // read end of range number, then process normally
1166                         n = (unsigned short)MSG_ReadShort();
1167                 }
1168                 // high bit means it's a remove message
1169                 cnumber = n & 0x7FFF;
1170                 // add one (the changed one) if not done
1171                 stopnumber = cnumber + !done;
1172                 // process entities in range from the last one to the changed one
1173                 for (;enumber < stopnumber;enumber++)
1174                 {
1175                         if (skip)
1176                         {
1177                                 if (enumber == cnumber && (n & 0x8000) == 0)
1178                                 {
1179                                         entity_state_t tempstate;
1180                                         EntityState_ReadFields(&tempstate, EntityState_ReadExtendBits());
1181                                 }
1182                                 continue;
1183                         }
1184                         // slide the current into the previous slot
1185                         cl_entities[enumber].state_previous = cl_entities[enumber].state_current;
1186                         // copy a new current from reference database
1187                         cl_entities[enumber].state_current = *EntityFrame4_GetReferenceEntity(d, enumber);
1188                         s = &cl_entities[enumber].state_current;
1189                         // if this is the one to modify, read more data...
1190                         if (enumber == cnumber)
1191                         {
1192                                 if (n & 0x8000)
1193                                 {
1194                                         // simply removed
1195                                         if (developer_networkentities.integer >= 2)
1196                                                 Con_Printf("entity %i: remove\n", enumber);
1197                                         *s = defaultstate;
1198                                 }
1199                                 else
1200                                 {
1201                                         // read the changes
1202                                         if (developer_networkentities.integer >= 2)
1203                                                 Con_Printf("entity %i: update\n", enumber);
1204                                         s->active = true;
1205                                         EntityState_ReadFields(s, EntityState_ReadExtendBits());
1206                                 }
1207                         }
1208                         else if (developer_networkentities.integer >= 4)
1209                                 Con_Printf("entity %i: copy\n", enumber);
1210                         // set the cl_entities_active flag
1211                         cl_entities_active[enumber] = s->active;
1212                         // set the update time
1213                         s->time = cl.mtime[0];
1214                         // fix the number (it gets wiped occasionally by copying from defaultstate)
1215                         s->number = enumber;
1216                         // check if we need to update the lerp stuff
1217                         if (s->active)
1218                                 CL_MoveLerpEntityStates(&cl_entities[enumber]);
1219                         // add this to the commit entry whether it is modified or not
1220                         if (d->currentcommit)
1221                                 EntityFrame4_AddCommitEntity(d, &cl_entities[enumber].state_current);
1222                         // print extra messages if desired
1223                         if (developer_networkentities.integer >= 2 && cl_entities[enumber].state_current.active != cl_entities[enumber].state_previous.active)
1224                         {
1225                                 if (cl_entities[enumber].state_current.active)
1226                                         Con_Printf("entity #%i has become active\n", enumber);
1227                                 else if (cl_entities[enumber].state_previous.active)
1228                                         Con_Printf("entity #%i has become inactive\n", enumber);
1229                         }
1230                 }
1231         }
1232         d->currentcommit = NULL;
1233         if (skip)
1234                 EntityFrame4_ResetDatabase(d);
1235 }
1236
1237 void EntityFrame4_WriteFrame(sizebuf_t *msg, entityframe4_database_t *d, int numstates, const entity_state_t *states)
1238 {
1239         const entity_state_t *e, *s;
1240         entity_state_t inactiveentitystate;
1241         int i, n, startnumber;
1242         sizebuf_t buf;
1243         qbyte data[128];
1244
1245         // if there isn't enough space to accomplish anything, skip it
1246         if (msg->cursize + 24 > msg->maxsize)
1247                 return;
1248
1249         // prepare the buffer
1250         memset(&buf, 0, sizeof(buf));
1251         buf.data = data;
1252         buf.maxsize = sizeof(data);
1253
1254         for (i = 0;i < MAX_ENTITY_HISTORY;i++)
1255                 if (!d->commit[i].numentities)
1256                         break;
1257         // if commit buffer full, just don't bother writing an update this frame
1258         if (i == MAX_ENTITY_HISTORY)
1259                 return;
1260         d->currentcommit = d->commit + i;
1261
1262         // this state's number gets played around with later
1263         inactiveentitystate = defaultstate;
1264
1265         d->currentcommit->numentities = 0;
1266         d->currentcommit->framenum = ++d->latestframenumber;
1267         MSG_WriteByte(msg, svc_entities);
1268         MSG_WriteLong(msg, d->referenceframenum);
1269         MSG_WriteLong(msg, d->currentcommit->framenum);
1270         if (developer_networkentities.integer >= 1)
1271         {
1272                 Con_Printf("send svc_entities num:%i ref:%i (database: ref:%i commits:", d->currentcommit->framenum, d->referenceframenum, d->referenceframenum);
1273                 for (i = 0;i < MAX_ENTITY_HISTORY;i++)
1274                         if (d->commit[i].numentities)
1275                                 Con_Printf(" %i", d->commit[i].framenum);
1276                 Con_Print(")\n");
1277         }
1278         if (d->currententitynumber >= sv.max_edicts)
1279                 startnumber = 1;
1280         else
1281                 startnumber = bound(1, d->currententitynumber, sv.max_edicts - 1);
1282         MSG_WriteShort(msg, startnumber);
1283         // reset currententitynumber so if the loop does not break it we will
1284         // start at beginning next frame (if it does break, it will set it)
1285         d->currententitynumber = 1;
1286         for (i = 0, n = startnumber;n < sv.max_edicts;n++)
1287         {
1288                 // find the old state to delta from
1289                 e = EntityFrame4_GetReferenceEntity(d, n);
1290                 // prepare the buffer
1291                 SZ_Clear(&buf);
1292                 // entity exists, build an update (if empty there is no change)
1293                 // find the state in the list
1294                 for (;i < numstates && states[i].number < n;i++);
1295                 // make the message
1296                 s = states + i;
1297                 if (s->number == n)
1298                 {
1299                         // build the update
1300                         EntityState_WriteUpdate(s, &buf, e);
1301                 }
1302                 else
1303                 {
1304                         inactiveentitystate.number = n;
1305                         s = &inactiveentitystate;
1306                         if (e->active)
1307                         {
1308                                 // entity used to exist but doesn't anymore, send remove
1309                                 MSG_WriteShort(&buf, n | 0x8000);
1310                         }
1311                 }
1312                 // if the commit is full, we're done this frame
1313                 if (msg->cursize + buf.cursize > msg->maxsize - 4)
1314                 {
1315                         // next frame we will continue where we left off
1316                         break;
1317                 }
1318                 // add the entity to the commit
1319                 EntityFrame4_AddCommitEntity(d, s);
1320                 // if the message is empty, skip out now
1321                 if (buf.cursize)
1322                 {
1323                         // write the message to the packet
1324                         SZ_Write(msg, buf.data, buf.cursize);
1325                 }
1326         }
1327         d->currententitynumber = n;
1328
1329         // remove world message (invalid, and thus a good terminator)
1330         MSG_WriteShort(msg, 0x8000);
1331         // write the number of the end entity
1332         MSG_WriteShort(msg, d->currententitynumber);
1333         // just to be sure
1334         d->currentcommit = NULL;
1335 }
1336
1337
1338
1339
1340 #define E5_PROTOCOL_PRIORITYLEVELS 32
1341
1342 entityframe5_database_t *EntityFrame5_AllocDatabase(mempool_t *pool)
1343 {
1344         entityframe5_database_t *d;
1345         d = Mem_Alloc(pool, sizeof(*d));
1346         EntityFrame5_ResetDatabase(d);
1347         return d;
1348 }
1349
1350 void EntityFrame5_FreeDatabase(entityframe5_database_t *d)
1351 {
1352         Mem_Free(d);
1353 }
1354
1355 void EntityFrame5_ResetDatabase(entityframe5_database_t *d)
1356 {
1357         int i;
1358         memset(d, 0, sizeof(*d));
1359         d->latestframenum = 0;
1360         d->ackframenum = -1;
1361         for (i = 0;i < MAX_EDICTS;i++)
1362                 d->states[i] = defaultstate;
1363 }
1364
1365
1366 int EntityState5_Priority(entityframe5_database_t *d, entity_state_t *view, entity_state_t *s, int changedbits, int age)
1367 {
1368         int lowprecision, limit, priority;
1369         double distance;
1370         if (!changedbits)
1371                 return 0;
1372         if (!s->active/* && changedbits & E5_FULLUPDATE*/)
1373                 return E5_PROTOCOL_PRIORITYLEVELS - 1;
1374         // check whole attachment chain to judge relevance to player
1375         lowprecision = false;
1376         for (limit = 0;limit < 256;limit++)
1377         {
1378                 if (s == view)
1379                         return E5_PROTOCOL_PRIORITYLEVELS - 1;
1380                 if (s->flags & RENDER_VIEWMODEL)
1381                         return E5_PROTOCOL_PRIORITYLEVELS - 1;
1382                 if (s->flags & RENDER_LOWPRECISION)
1383                         lowprecision = true;
1384                 if (!s->tagentity)
1385                 {
1386                         if (VectorCompare(s->origin, view->origin))
1387                                 return E5_PROTOCOL_PRIORITYLEVELS - 1;
1388                         break;
1389                 }
1390                 s = d->states + s->tagentity;
1391         }
1392         if (limit >= 256)
1393                 Con_Printf("Protocol: Runaway loop recursing tagentity links on entity %i\n", s->number);
1394         // it's not a viewmodel for this client
1395         distance = VectorDistance(view->origin, s->origin);
1396         priority = (E5_PROTOCOL_PRIORITYLEVELS / 2) + age - (int)(distance * (E5_PROTOCOL_PRIORITYLEVELS / 16384.0f));
1397         if (lowprecision)
1398                 priority -= (E5_PROTOCOL_PRIORITYLEVELS / 4);
1399         //if (changedbits & E5_FULLUPDATE)
1400         //      priority += 4;
1401         //if (changedbits & (E5_ATTACHMENT | E5_MODEL | E5_FLAGS | E5_COLORMAP))
1402         //      priority += 4;
1403         return (int) bound(1, priority, E5_PROTOCOL_PRIORITYLEVELS - 1);
1404 }
1405
1406 void EntityState5_WriteUpdate(int number, const entity_state_t *s, int changedbits, sizebuf_t *msg)
1407 {
1408         unsigned int bits = 0;
1409         if (!s->active)
1410                 MSG_WriteShort(msg, number | 0x8000);
1411         else
1412         {
1413                 bits = changedbits;
1414                 if ((bits & E5_ORIGIN) && (s->origin[0] < -4096 || s->origin[0] >= 4096 || s->origin[1] < -4096 || s->origin[1] >= 4096 || s->origin[2] < -4096 || s->origin[2] >= 4096))
1415                         bits |= E5_ORIGIN32;
1416                 if ((bits & E5_ANGLES) && !(s->flags & RENDER_LOWPRECISION))
1417                         bits |= E5_ANGLES16;
1418                 if ((bits & E5_MODEL) && s->modelindex >= 256)
1419                         bits |= E5_MODEL16;
1420                 if ((bits & E5_FRAME) && s->frame >= 256)
1421                         bits |= E5_FRAME16;
1422                 if (bits & E5_EFFECTS)
1423                 {
1424                         if (s->effects >= 65536)
1425                                 bits |= E5_EFFECTS32;
1426                         else if (s->effects >= 256)
1427                                 bits |= E5_EFFECTS16;
1428                 }
1429                 if (bits >= 256)
1430                         bits |= E5_EXTEND1;
1431                 if (bits >= 65536)
1432                         bits |= E5_EXTEND2;
1433                 if (bits >= 16777216)
1434                         bits |= E5_EXTEND3;
1435                 MSG_WriteShort(msg, number);
1436                 MSG_WriteByte(msg, bits & 0xFF);
1437                 if (bits & E5_EXTEND1)
1438                         MSG_WriteByte(msg, (bits >> 8) & 0xFF);
1439                 if (bits & E5_EXTEND2)
1440                         MSG_WriteByte(msg, (bits >> 16) & 0xFF);
1441                 if (bits & E5_EXTEND3)
1442                         MSG_WriteByte(msg, (bits >> 24) & 0xFF);
1443                 if (bits & E5_FLAGS)
1444                         MSG_WriteByte(msg, s->flags);
1445                 if (bits & E5_ORIGIN)
1446                 {
1447                         if (bits & E5_ORIGIN32)
1448                         {
1449                                 MSG_WriteCoord32f(msg, s->origin[0]);
1450                                 MSG_WriteCoord32f(msg, s->origin[1]);
1451                                 MSG_WriteCoord32f(msg, s->origin[2]);
1452                         }
1453                         else
1454                         {
1455                                 MSG_WriteCoord13i(msg, s->origin[0]);
1456                                 MSG_WriteCoord13i(msg, s->origin[1]);
1457                                 MSG_WriteCoord13i(msg, s->origin[2]);
1458                         }
1459                 }
1460                 if (bits & E5_ANGLES)
1461                 {
1462                         if (bits & E5_ANGLES16)
1463                         {
1464                                 MSG_WriteAngle16i(msg, s->angles[0]);
1465                                 MSG_WriteAngle16i(msg, s->angles[1]);
1466                                 MSG_WriteAngle16i(msg, s->angles[2]);
1467                         }
1468                         else
1469                         {
1470                                 MSG_WriteAngle8i(msg, s->angles[0]);
1471                                 MSG_WriteAngle8i(msg, s->angles[1]);
1472                                 MSG_WriteAngle8i(msg, s->angles[2]);
1473                         }
1474                 }
1475                 if (bits & E5_MODEL)
1476                 {
1477                         if (bits & E5_MODEL16)
1478                                 MSG_WriteShort(msg, s->modelindex);
1479                         else
1480                                 MSG_WriteByte(msg, s->modelindex);
1481                 }
1482                 if (bits & E5_FRAME)
1483                 {
1484                         if (bits & E5_FRAME16)
1485                                 MSG_WriteShort(msg, s->frame);
1486                         else
1487                                 MSG_WriteByte(msg, s->frame);
1488                 }
1489                 if (bits & E5_SKIN)
1490                         MSG_WriteByte(msg, s->skin);
1491                 if (bits & E5_EFFECTS)
1492                 {
1493                         if (bits & E5_EFFECTS32)
1494                                 MSG_WriteLong(msg, s->effects);
1495                         else if (bits & E5_EFFECTS16)
1496                                 MSG_WriteShort(msg, s->effects);
1497                         else
1498                                 MSG_WriteByte(msg, s->effects);
1499                 }
1500                 if (bits & E5_ALPHA)
1501                         MSG_WriteByte(msg, s->alpha);
1502                 if (bits & E5_SCALE)
1503                         MSG_WriteByte(msg, s->scale);
1504                 if (bits & E5_COLORMAP)
1505                         MSG_WriteByte(msg, s->colormap);
1506                 if (bits & E5_ATTACHMENT)
1507                 {
1508                         MSG_WriteShort(msg, s->tagentity);
1509                         MSG_WriteByte(msg, s->tagindex);
1510                 }
1511                 if (bits & E5_LIGHT)
1512                 {
1513                         MSG_WriteShort(msg, s->light[0]);
1514                         MSG_WriteShort(msg, s->light[1]);
1515                         MSG_WriteShort(msg, s->light[2]);
1516                         MSG_WriteShort(msg, s->light[3]);
1517                         MSG_WriteByte(msg, s->lightstyle);
1518                         MSG_WriteByte(msg, s->lightpflags);
1519                 }
1520                 if (bits & E5_GLOW)
1521                 {
1522                         MSG_WriteByte(msg, s->glowsize);
1523                         MSG_WriteByte(msg, s->glowcolor);
1524                 }
1525         }
1526 }
1527
1528 void EntityState5_ReadUpdate(entity_state_t *s)
1529 {
1530         int bits;
1531         bits = MSG_ReadByte();
1532         if (bits & E5_EXTEND1)
1533         {
1534                 bits |= MSG_ReadByte() << 8;
1535                 if (bits & E5_EXTEND2)
1536                 {
1537                         bits |= MSG_ReadByte() << 16;
1538                         if (bits & E5_EXTEND3)
1539                                 bits |= MSG_ReadByte() << 24;
1540                 }
1541         }
1542         if (bits & E5_FULLUPDATE)
1543         {
1544                 *s = defaultstate;
1545                 s->active = true;
1546         }
1547         if (bits & E5_FLAGS)
1548                 s->flags = MSG_ReadByte();
1549         if (bits & E5_ORIGIN)
1550         {
1551                 if (bits & E5_ORIGIN32)
1552                 {
1553                         s->origin[0] = MSG_ReadCoord32f();
1554                         s->origin[1] = MSG_ReadCoord32f();
1555                         s->origin[2] = MSG_ReadCoord32f();
1556                 }
1557                 else
1558                 {
1559                         s->origin[0] = MSG_ReadCoord13i();
1560                         s->origin[1] = MSG_ReadCoord13i();
1561                         s->origin[2] = MSG_ReadCoord13i();
1562                 }
1563         }
1564         if (bits & E5_ANGLES)
1565         {
1566                 if (bits & E5_ANGLES16)
1567                 {
1568                         s->angles[0] = MSG_ReadAngle16i(); 
1569                         s->angles[1] = MSG_ReadAngle16i(); 
1570                         s->angles[2] = MSG_ReadAngle16i(); 
1571                 }
1572                 else
1573                 {
1574                         s->angles[0] = MSG_ReadAngle8i(); 
1575                         s->angles[1] = MSG_ReadAngle8i(); 
1576                         s->angles[2] = MSG_ReadAngle8i(); 
1577                 }
1578         }
1579         if (bits & E5_MODEL)
1580         {
1581                 if (bits & E5_MODEL16)
1582                         s->modelindex = (unsigned short) MSG_ReadShort();
1583                 else
1584                         s->modelindex = MSG_ReadByte();
1585         }
1586         if (bits & E5_FRAME)
1587         {
1588                 if (bits & E5_FRAME16)
1589                         s->frame = (unsigned short) MSG_ReadShort();
1590                 else
1591                         s->frame = MSG_ReadByte();
1592         }
1593         if (bits & E5_SKIN)
1594                 s->skin = MSG_ReadByte();
1595         if (bits & E5_EFFECTS)
1596         {
1597                 if (bits & E5_EFFECTS32)
1598                         s->effects = (unsigned int) MSG_ReadLong();
1599                 else if (bits & E5_EFFECTS16)
1600                         s->effects = (unsigned short) MSG_ReadShort();
1601                 else
1602                         s->effects = MSG_ReadByte();
1603         }
1604         if (bits & E5_ALPHA)
1605                 s->alpha = MSG_ReadByte();
1606         if (bits & E5_SCALE)
1607                 s->scale = MSG_ReadByte();
1608         if (bits & E5_COLORMAP)
1609                 s->colormap = MSG_ReadByte();
1610         if (bits & E5_ATTACHMENT)
1611         {
1612                 s->tagentity = (unsigned short) MSG_ReadShort();
1613                 s->tagindex = MSG_ReadByte();
1614         }
1615         if (bits & E5_LIGHT)
1616         {
1617                 s->light[0] = (unsigned short) MSG_ReadShort();
1618                 s->light[1] = (unsigned short) MSG_ReadShort();
1619                 s->light[2] = (unsigned short) MSG_ReadShort();
1620                 s->light[3] = (unsigned short) MSG_ReadShort();
1621                 s->lightstyle = MSG_ReadByte();
1622                 s->lightpflags = MSG_ReadByte();
1623         }
1624         if (bits & E5_GLOW)
1625         {
1626                 s->glowsize = MSG_ReadByte();
1627                 s->glowcolor = MSG_ReadByte();
1628         }
1629
1630
1631         if (developer_networkentities.integer >= 2)
1632         {
1633                 Con_Printf("ReadFields e%i", s->number);
1634
1635                 if (bits & E5_ORIGIN)
1636                         Con_Printf(" E5_ORIGIN %f %f %f", s->origin[0], s->origin[1], s->origin[2]);
1637                 if (bits & E5_ANGLES)
1638                         Con_Printf(" E5_ANGLES %f %f %f", s->angles[0], s->angles[1], s->angles[2]);
1639                 if (bits & E5_MODEL)
1640                         Con_Printf(" E5_MODEL %i", s->modelindex);
1641                 if (bits & E5_FRAME)
1642                         Con_Printf(" E5_FRAME %i", s->frame);
1643                 if (bits & E5_SKIN)
1644                         Con_Printf(" E5_SKIN %i", s->skin);
1645                 if (bits & E5_EFFECTS)
1646                         Con_Printf(" E5_EFFECTS %i", s->effects);
1647                 if (bits & E5_FLAGS)
1648                 {
1649                         Con_Printf(" E5_FLAGS %i (", s->flags);
1650                         if (s->flags & RENDER_STEP)
1651                                 Con_Print(" STEP");
1652                         if (s->flags & RENDER_GLOWTRAIL)
1653                                 Con_Print(" GLOWTRAIL");
1654                         if (s->flags & RENDER_VIEWMODEL)
1655                                 Con_Print(" VIEWMODEL");
1656                         if (s->flags & RENDER_EXTERIORMODEL)
1657                                 Con_Print(" EXTERIORMODEL");
1658                         if (s->flags & RENDER_LOWPRECISION)
1659                                 Con_Print(" LOWPRECISION");
1660                         if (s->flags & RENDER_COLORMAPPED)
1661                                 Con_Print(" COLORMAPPED");
1662                         if (s->flags & RENDER_SHADOW)
1663                                 Con_Print(" SHADOW");
1664                         if (s->flags & RENDER_LIGHT)
1665                                 Con_Print(" LIGHT");
1666                         Con_Print(")");
1667                 }
1668                 if (bits & E5_ALPHA)
1669                         Con_Printf(" E5_ALPHA %f", s->alpha / 255.0f);
1670                 if (bits & E5_SCALE)
1671                         Con_Printf(" E5_SCALE %f", s->scale / 16.0f);
1672                 if (bits & E5_COLORMAP)
1673                         Con_Printf(" E5_COLORMAP %i", s->colormap);
1674                 if (bits & E5_ATTACHMENT)
1675                         Con_Printf(" E5_ATTACHMENT e%i:%i", s->tagentity, s->tagindex);
1676                 if (bits & E5_LIGHT)
1677                         Con_Printf(" E5_LIGHT %i:%i:%i:%i %i:%i", s->light[0], s->light[1], s->light[2], s->light[3], s->lightstyle, s->lightpflags);
1678                 if (bits & E5_GLOW)
1679                         Con_Printf(" E5_GLOW %i:%i", s->glowsize * 4, s->glowcolor);
1680                 Con_Print("\n");
1681         }
1682 }
1683
1684 int EntityState5_DeltaBits(const entity_state_t *o, const entity_state_t *n)
1685 {
1686         unsigned int bits = 0;
1687         if (n->active)
1688         {
1689                 if (!o->active)
1690                         bits |= E5_FULLUPDATE;
1691                 if (!VectorCompare(o->origin, n->origin))
1692                         bits |= E5_ORIGIN;
1693                 if (!VectorCompare(o->angles, n->angles))
1694                         bits |= E5_ANGLES;
1695                 if (o->modelindex != n->modelindex)
1696                         bits |= E5_MODEL;
1697                 if (o->frame != n->frame)
1698                         bits |= E5_FRAME;
1699                 if (o->skin != n->skin)
1700                         bits |= E5_SKIN;
1701                 if (o->effects != n->effects)
1702                         bits |= E5_EFFECTS;
1703                 if (o->flags != n->flags)
1704                         bits |= E5_FLAGS;
1705                 if (o->alpha != n->alpha)
1706                         bits |= E5_ALPHA;
1707                 if (o->scale != n->scale)
1708                         bits |= E5_SCALE;
1709                 if (o->colormap != n->colormap)
1710                         bits |= E5_COLORMAP;
1711                 if (o->tagentity != n->tagentity || o->tagindex != n->tagindex)
1712                         bits |= E5_ATTACHMENT;
1713                 if (o->light[0] != n->light[0] || o->light[1] != n->light[1] || o->light[2] != n->light[2] || o->light[3] != n->light[3] || o->lightstyle != n->lightstyle || o->lightpflags != n->lightpflags)
1714                         bits |= E5_LIGHT;
1715                 if (o->glowsize != n->glowsize || o->glowcolor != n->glowcolor)
1716                         bits |= E5_GLOW;
1717         }
1718         else
1719                 if (o->active)
1720                         bits |= E5_FULLUPDATE;
1721         return bits;
1722 }
1723
1724 void EntityFrame5_CL_ReadFrame(void)
1725 {
1726         int n, enumber;
1727         entity_t *ent;
1728         entity_state_t *s;
1729         // read the number of this frame to echo back in next input packet
1730         cl.latestframenum = MSG_ReadLong();
1731         // read entity numbers until we find a 0x8000
1732         // (which would be remove world entity, but is actually a terminator)
1733         while ((n = (unsigned short)MSG_ReadShort()) != 0x8000 && !msg_badread)
1734         {
1735                 // get the entity number and look it up
1736                 enumber = n & 0x7FFF;
1737                 ent = cl_entities + enumber;
1738                 // slide the current into the previous slot
1739                 ent->state_previous = ent->state_current;
1740                 // read the update
1741                 s = &ent->state_current;
1742                 if (n & 0x8000)
1743                 {
1744                         // remove entity
1745                         *s = defaultstate;
1746                 }
1747                 else
1748                 {
1749                         // update entity
1750                         EntityState5_ReadUpdate(s);
1751                 }
1752                 // set the cl_entities_active flag
1753                 cl_entities_active[enumber] = s->active;
1754                 // set the update time
1755                 s->time = cl.mtime[0];
1756                 // fix the number (it gets wiped occasionally by copying from defaultstate)
1757                 s->number = enumber;
1758                 // check if we need to update the lerp stuff
1759                 if (s->active)
1760                         CL_MoveLerpEntityStates(&cl_entities[enumber]);
1761                 // print extra messages if desired
1762                 if (developer_networkentities.integer >= 2 && cl_entities[enumber].state_current.active != cl_entities[enumber].state_previous.active)
1763                 {
1764                         if (cl_entities[enumber].state_current.active)
1765                                 Con_Printf("entity #%i has become active\n", enumber);
1766                         else if (cl_entities[enumber].state_previous.active)
1767                                 Con_Printf("entity #%i has become inactive\n", enumber);
1768                 }
1769         }
1770 }
1771
1772 void EntityFrame5_AckFrame(entityframe5_database_t *d, int framenum, int viewentnum)
1773 {
1774         int i, j, k, l, bits;
1775         entityframe5_changestate_t *s, *s2;
1776         entityframe5_packetlog_t *p, *p2;
1777         if (framenum <= d->ackframenum)
1778                 return;
1779         d->ackframenum = framenum;
1780         // scan for packets made obsolete by this ack
1781         for (i = 0, p = d->packetlog;i < ENTITYFRAME5_MAXPACKETLOGS;i++, p++)
1782         {
1783                 // skip packets that are empty or in the future
1784                 if (p->packetnumber == 0 || p->packetnumber > framenum)
1785                         continue;
1786                 // if the packetnumber matches it is deleted without any processing 
1787                 // (since it was received).
1788                 // if the packet number is less than this ack it was lost and its
1789                 // important information will be repeated in this update if it is not
1790                 // already obsolete due to a later update.
1791                 if (p->packetnumber < framenum)
1792                 {
1793                         // packet was lost - merge deltabits into the main array so they
1794                         // will be re-sent, but only if there is no newer update of that
1795                         // bit in the logs (as those will arrive before this update)
1796                         for (j = 0, s = p->states;j < p->numstates;j++, s++)
1797                         {
1798                                 // check for any newer updates to this entity and mask off any
1799                                 // overlapping bits (we don't need to send something again if
1800                                 // it has already been sent more recently)
1801                                 bits = s->bits & ~d->deltabits[s->number];
1802                                 for (k = 0, p2 = d->packetlog;k < ENTITYFRAME5_MAXPACKETLOGS && bits;k++, p2++)
1803                                 {
1804                                         if (p2->packetnumber > framenum)
1805                                         {
1806                                                 for (l = 0, s2 = p2->states;l < p2->numstates;l++, p2++)
1807                                                 {
1808                                                         if (s2->number == s->number)
1809                                                         {
1810                                                                 bits &= ~s2->bits;
1811                                                                 break;
1812                                                         }
1813                                                 }
1814                                         }
1815                                 }
1816                                 // if the bits haven't all been cleared, there were some bits
1817                                 // lost with this packet, so set them again now
1818                                 if (bits)
1819                                 {
1820                                         d->deltabits[s->number] |= bits;
1821                                         d->priorities[s->number] = EntityState5_Priority(d, d->states + viewentnum, d->states + s->number, d->deltabits[s->number], d->latestframenum - d->updateframenum[s->number]);
1822                                 }
1823                         }
1824                 }
1825                 // delete this packet log as it is now obsolete
1826                 p->packetnumber = 0;
1827         }
1828 }
1829
1830 int entityframe5_prioritychaincounts[E5_PROTOCOL_PRIORITYLEVELS];
1831 unsigned short entityframe5_prioritychains[E5_PROTOCOL_PRIORITYLEVELS][ENTITYFRAME5_MAXSTATES];
1832
1833 void EntityFrame5_WriteFrame(sizebuf_t *msg, entityframe5_database_t *d, int numstates, const entity_state_t *states, int viewentnum)
1834 {
1835         const entity_state_t *n;
1836         int i, num, l, framenum, packetlognumber, priority;
1837         sizebuf_t buf;
1838         qbyte data[128];
1839         entityframe5_packetlog_t *packetlog;
1840
1841         framenum = d->latestframenum + 1;
1842
1843         // prepare the buffer
1844         memset(&buf, 0, sizeof(buf));
1845         buf.data = data;
1846         buf.maxsize = sizeof(data);
1847
1848         // detect changes in states
1849         num = 0;
1850         for (i = 0, n = states;i < numstates;i++, n++)
1851         {
1852                 // mark gaps in entity numbering as removed entities
1853                 for (;num < n->number;num++)
1854                 {
1855                         // if the entity used to exist, clear it
1856                         if (CHECKPVSBIT(d->visiblebits, num))
1857                         {
1858                                 CLEARPVSBIT(d->visiblebits, num);
1859                                 d->deltabits[num] = E5_FULLUPDATE;
1860                                 d->priorities[num] = EntityState5_Priority(d, d->states + viewentnum, d->states + num, d->deltabits[num], framenum - d->updateframenum[num]);
1861                                 d->states[num] = defaultstate;
1862                                 d->states[num].number = num;
1863                         }
1864                 }
1865                 // update the entity state data
1866                 if (!CHECKPVSBIT(d->visiblebits, num))
1867                 {
1868                         // entity just spawned in, don't let it completely hog priority
1869                         // because of being ancient on the first frame
1870                         d->updateframenum[num] = framenum;
1871                 }
1872                 SETPVSBIT(d->visiblebits, num);
1873                 d->deltabits[num] |= EntityState5_DeltaBits(d->states + num, n);
1874                 d->priorities[num] = EntityState5_Priority(d, d->states + viewentnum, d->states + num, d->deltabits[num], framenum - d->updateframenum[num]);
1875                 d->states[num] = *n;
1876                 d->states[num].number = num;
1877                 // advance to next entity so the next iteration doesn't immediately remove it
1878                 num++;
1879         }
1880         // all remaining entities are dead
1881         for (;num < MAX_EDICTS;num++)
1882         {
1883                 if (CHECKPVSBIT(d->visiblebits, num))
1884                 {
1885                         CLEARPVSBIT(d->visiblebits, num);
1886                         d->deltabits[num] = E5_FULLUPDATE;
1887                         d->priorities[num] = EntityState5_Priority(d, d->states + viewentnum, d->states + num, d->deltabits[num], framenum - d->updateframenum[num]);
1888                         d->states[num] = defaultstate;
1889                         d->states[num].number = num;
1890                 }
1891         }
1892
1893         // build lists of entities by priority level
1894         memset(entityframe5_prioritychaincounts, 0, sizeof(entityframe5_prioritychaincounts));
1895         l = 0;
1896         for (num = 0;num < MAX_EDICTS;num++)
1897         {
1898                 if (d->priorities[num])
1899                 {
1900                         l = num;
1901                         priority = d->priorities[num];
1902                         if (entityframe5_prioritychaincounts[priority] < ENTITYFRAME5_MAXSTATES)
1903                                 entityframe5_prioritychains[priority][entityframe5_prioritychaincounts[priority]++] = num;
1904                 }
1905         }
1906
1907         // return early if there are no entities to send this time
1908         if (l == 0)
1909                 return;
1910
1911         d->latestframenum = framenum;
1912         MSG_WriteByte(msg, svc_entities);
1913         MSG_WriteLong(msg, framenum);
1914
1915         // if packet log is full, an empty update is still written
1916         // (otherwise the client might have nothing to ack to remove packetlogs)
1917         for (packetlognumber = 0, packetlog = d->packetlog;packetlognumber < ENTITYFRAME5_MAXPACKETLOGS;packetlognumber++, packetlog++)
1918                 if (packetlog->packetnumber == 0)
1919                         break;
1920         if (packetlognumber < ENTITYFRAME5_MAXPACKETLOGS)
1921         {
1922                 // write to packet and log
1923                 packetlog->packetnumber = framenum;
1924                 packetlog->numstates = 0;
1925                 for (priority = E5_PROTOCOL_PRIORITYLEVELS - 1;priority >= 0 && packetlog->numstates < ENTITYFRAME5_MAXSTATES;priority--)
1926                 {
1927                         for (i = 0;i < entityframe5_prioritychaincounts[priority] && packetlog->numstates < ENTITYFRAME5_MAXSTATES;i++)
1928                         {
1929                                 num = entityframe5_prioritychains[priority][i];
1930                                 n = d->states + num;
1931                                 if (d->deltabits[num] & E5_FULLUPDATE)
1932                                         d->deltabits[num] = E5_FULLUPDATE | EntityState5_DeltaBits(&defaultstate, n);
1933                                 buf.cursize = 0;
1934                                 EntityState5_WriteUpdate(num, n, d->deltabits[num], &buf);
1935                                 // if the entity won't fit, try the next one
1936                                 if (msg->cursize + buf.cursize + 2 > msg->maxsize)
1937                                         continue;
1938                                 // write entity to the packet
1939                                 SZ_Write(msg, buf.data, buf.cursize);
1940                                 // mark age on entity for prioritization
1941                                 d->updateframenum[num] = framenum;
1942                                 // log entity so deltabits can be restored later if lost
1943                                 packetlog->states[packetlog->numstates].number = num;
1944                                 packetlog->states[packetlog->numstates].bits = d->deltabits[num];
1945                                 packetlog->numstates++;
1946                                 // clear deltabits and priority so it won't be sent again
1947                                 d->deltabits[num] = 0;
1948                                 d->priorities[num] = 0;
1949                         }
1950                 }
1951         }
1952
1953         MSG_WriteShort(msg, 0x8000);
1954 }
1955