void MetavoxelSession::sendDelta() {
// wait until we have a valid lod
if (!_lod.isValid()) {
return;
}
Bitstream& out = _sequencer.startPacket();
out << QVariant::fromValue(MetavoxelDeltaMessage());
_server->getData().writeDelta(_sendRecords.first().data, _sendRecords.first().lod, out, _lod);
_sequencer.endPacket();
// record the send
SendRecord record = { _sequencer.getOutgoingPacketNumber(), _server->getData(), _lod };
_sendRecords.append(record);
}
void MetavoxelSession::update() {
// wait until we have a valid lod before sending
if (!_lod.isValid()) {
return;
}
// if we're sending a reliable delta, wait until it's acknowledged
if (_reliableDeltaChannel) {
sendPacketGroup();
return;
}
Bitstream& out = _sequencer.startPacket();
int start = _sequencer.getOutputStream().getUnderlying().device()->pos();
out << QVariant::fromValue(MetavoxelDeltaMessage());
PacketRecord* sendRecord = getLastAcknowledgedSendRecord();
_server->getData().writeDelta(sendRecord->getData(), sendRecord->getLOD(), out, _lod);
out.flush();
int end = _sequencer.getOutputStream().getUnderlying().device()->pos();
if (end > _sequencer.getMaxPacketSize()) {
// we need to send the delta on the reliable channel
_reliableDeltaChannel = _sequencer.getReliableOutputChannel(RELIABLE_DELTA_CHANNEL_INDEX);
_reliableDeltaChannel->startMessage();
_reliableDeltaChannel->getBuffer().write(_sequencer.getOutgoingPacketData().constData() + start, end - start);
_reliableDeltaChannel->endMessage();
_reliableDeltaWriteMappings = out.getAndResetWriteMappings();
_reliableDeltaReceivedOffset = _reliableDeltaChannel->getBytesWritten();
_reliableDeltaData = _server->getData();
_reliableDeltaLOD = _lod;
// go back to the beginning with the current packet and note that there's a delta pending
_sequencer.getOutputStream().getUnderlying().device()->seek(start);
MetavoxelDeltaPendingMessage msg = { ++_reliableDeltaID };
out << QVariant::fromValue(msg);
_sequencer.endPacket();
} else {
_sequencer.endPacket();
}
// perhaps send additional packets to fill out the group
sendPacketGroup(1);
}
