+
+typedef struct entity_database4_commit_s
+{
+ // frame number this commit represents
+ int framenum;
+ // number of entities in entity[] array
+ int numentities;
+ // maximum number of entities in entity[] array (dynamic resizing)
+ int maxentities;
+ entity_state_t *entity;
+}
+entity_database4_commit_t;
+
+typedef struct entity_database4_s
+{
+ // what mempool to use for allocations
+ mempool_t *mempool;
+ // reference frame
+ int referenceframenum;
+ // reference entities array is resized according to demand
+ int maxreferenceentities;
+ // array of states for entities, these are indexable by their entity number (yes there are gaps)
+ entity_state_t *referenceentity;
+ // commits waiting to be applied to the reference database when confirmed
+ // (commit[i]->numentities == 0 means it is empty)
+ entity_database4_commit_t commit[MAX_ENTITY_HISTORY];
+ // (server only) the current commit being worked on
+ entity_database4_commit_t *currentcommit;
+ // (server only) if a commit won't fit entirely, continue where it left
+ // off next frame
+ int currententitynumber;
+ // (client only) most recently received frame number to be sent in next
+ // input update
+ int ackframenum;
+}
+entity_database4_t;
+
+// should-be-private functions that aren't
+entity_state_t *EntityFrame4_GetReferenceEntity(entity_database4_t *d, int number);
+void EntityFrame4_AddCommitEntity(entity_database4_t *d, entity_state_t *s);
+
+// allocate a database
+entity_database4_t *EntityFrame4_AllocDatabase(mempool_t *pool);
+// free a database
+void EntityFrame4_FreeDatabase(entity_database4_t *d);
+// reset a database (resets compression but does not reallocate anything)
+void EntityFrame4_ResetDatabase(entity_database4_t *d);
+// updates database to account for a frame-received acknowledgment
+int EntityFrame4_AckFrame(entity_database4_t *d, int framenum);
+
+// write an entity in the frame
+// returns false if full
+int EntityFrame4_SV_WriteFrame_Entity(entity_database4_t *d, sizebuf_t *msg, int maxbytes, entity_state_t *s);
+
+// reads a frame from the network stream
+void EntityFrame4_CL_ReadFrame(entity_database4_t *d);
+
+// reset all entity fields (typically used if status changed)
+#define E5_FULLUPDATE (1<<0)
+// E5_ORIGIN32=0: short[3] = s->origin[0] * 8, s->origin[1] * 8, s->origin[2] * 8
+// E5_ORIGIN32=1: float[3] = s->origin[0], s->origin[1], s->origin[2]
+#define E5_ORIGIN (1<<1)
+// E5_ANGLES16=0: byte[3] = s->angle[0] * 256 / 360, s->angle[1] * 256 / 360, s->angle[2] * 256 / 360
+// E5_ANGLES16=1: short[3] = s->angle[0] * 65536 / 360, s->angle[1] * 65536 / 360, s->angle[2] * 65536 / 360
+#define E5_ANGLES (1<<2)
+// E5_MODEL16=0: byte = s->modelindex
+// E5_MODEL16=1: short = s->modelindex
+#define E5_MODEL (1<<3)
+// E5_FRAME16=0: byte = s->frame
+// E5_FRAME16=1: short = s->frame
+#define E5_FRAME (1<<4)
+// byte = s->skin
+#define E5_SKIN (1<<5)
+// E5_EFFECTS16=0 && E5_EFFECTS32=0: byte = s->effects
+// E5_EFFECTS16=1 && E5_EFFECTS32=0: short = s->effects
+// E5_EFFECTS16=0 && E5_EFFECTS32=1: int = s->effects
+// E5_EFFECTS16=1 && E5_EFFECTS32=1: int = s->effects
+#define E5_EFFECTS (1<<6)
+// bits >= (1<<8)
+#define E5_EXTEND1 (1<<7)
+
+// flag
+#define E5_ORIGIN32 (1<<9)
+// flag
+#define E5_ANGLES16 (1<<10)
+// flag
+#define E5_MODEL16 (1<<11)
+// byte = s->renderflags
+#define E5_FLAGS (1<<6)
+// byte = bound(0, s->alpha * 255, 255)
+#define E5_ALPHA (1<<13)
+// byte = bound(0, s->scale * 16, 255)
+#define E5_SCALE (1<<14)
+// bits >= (1<<16)
+#define E5_EXTEND2 (1<<15)
+
+// short = s->tagentity
+// byte = s->tagindex
+#define E5_ATTACHMENT (1<<16)
+// short = s->exteriormodelforentity
+#define E5_EXTERIORFORENTITY (1<<17)
+// short[4] = s->light[0], s->light[1], s->light[2], s->light[3]
+#define E5_LIGHT (1<<18)
+// byte = s->colormap
+#define E5_COLORMAP (1<<19)
+// byte = s->glowsize
+// byte = s->glowcolor
+#define E5_GLOW (1<<20)
+// short = s->effects
+#define E5_EFFECTS16 (1<<21)
+// int = s->effects
+#define E5_EFFECTS32 (1<<22)
+// bits >= (1<<24)
+#define E5_EXTEND3 (1<<23)
+
+// flag
+#define E5_FRAME16 (1<<24)
+// unused
+#define E5_UNUSED25 (1<<25)
+// unused
+#define E5_UNUSED26 (1<<26)
+// unused
+#define E5_UNUSED27 (1<<27)
+// unused
+#define E5_UNUSED28 (1<<28)
+// unused
+#define E5_UNUSED29 (1<<29)
+// unused
+#define E5_UNUSED30 (1<<30)
+// bits2 > 0
+#define E5_EXTEND4 (1<<31)
+
+typedef struct entity_database5_client_s
+{
+ qbyte visible[MAX_EDICTS];
+ qbyte visibledelta[MAX_EDICTS];
+ int statedelta[MAX_EDICTS];
+}
+entity_database5_t;
+
+typedef struct entity_database5_server_s
+{
+ // temporary working space for client data building
+ // 0-255 priority level, 0 = don't send
+ qbyte priorities[MAX_EDICTS];
+ // this is the visible entity numbers, sorted by their priority level
+ int numentitylist;
+ int entitylist[MAX_EDICTS];
+}
+entity_database5_server_t;
+
+extern cvar_t developer_networkentities;
+
+#endif
+