Function SV_EmitPacketEntities

code/server/sv_snapshot.cpp:58–120

============= SV_EmitPacketEntities Writes a delta update of an entityState_t list to the message. ============= */

=============
*/
static void SV_EmitPacketEntities( clientSnapshot_t *from, clientSnapshot_t *to, msg_t *msg ) {
	entityState_t	*oldent, *newent;
	int		oldindex, newindex;
	int		oldnum, newnum;
	int		from_num_entities;

	// generate the delta update
	if ( !from ) {
		from_num_entities = 0;
	} else {
		from_num_entities = from->num_entities;
	}

	newent = NULL;
	oldent = NULL;
	newindex = 0;
	oldindex = 0;
	const int num2Send = to->num_entities >= svs.numSnapshotEntities ? svs.numSnapshotEntities : to->num_entities;

	while ( newindex < num2Send || oldindex < from_num_entities ) {
		if ( newindex >= num2Send ) {
			newnum = 9999;
		} else {
			newent = &svs.snapshotEntities[(to->first_entity+newindex) % svs.numSnapshotEntities];
			newnum = newent->number;
		}

		if ( oldindex >= from_num_entities ) {
			oldnum = 9999;
		} else {
			oldent = &svs.snapshotEntities[(from->first_entity+oldindex) % svs.numSnapshotEntities];
			oldnum = oldent->number;
		}

		if ( newnum == oldnum ) {
			// delta update from old position
			// because the force parm is qfalse, this will not result
			// in any bytes being emited if the entity has not changed at all
			MSG_WriteEntity(msg, newent, 0);
			oldindex++;
			newindex++;
			continue;
		}

		if ( newnum < oldnum ) {
			// this is a new entity, send it from the baseline
			MSG_WriteEntity (msg, newent, 0);
			newindex++;
			continue;
		}

		if ( newnum > oldnum ) {
			// the old entity isn't present in the new message
			if(oldent) {
				MSG_WriteEntity (msg, NULL, oldent->number);
			}
			oldindex++;
			continue;