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Add object replication data cache and send via Reliable channel to reduce data transfer

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This commit is contained in:
Wojtek Figat
2024-10-15 19:47:09 +02:00
parent 60ed23105d
commit c94052513e
4 changed files with 74 additions and 14 deletions
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60
Source/Engine/Networking/NetworkReplicator.cpp
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@@ -126,12 +126,29 @@ struct NetworkReplicatedObject
DataContainer<uint32> TargetClientIds;
INetworkObject* AsNetworkObject;
struct
{
NetworkClientsMask Mask;
BytesContainer Data;
void Clear()
{
Mask = NetworkClientsMask();
Data.Release();
}
} RepCache;
NetworkReplicatedObject()
{
Spawned = 0;
Synced = 0;
}
void Dirty()
{
RepCache.Mask = NetworkClientsMask();
}
bool operator==(const NetworkReplicatedObject& other) const
{
return Object == other.Object;
@@ -684,6 +701,7 @@ void FindObjectsForSpawn(SpawnGroup& group, ChunkedArray<SpawnItem, 256>& spawnI
FORCE_INLINE void DirtyObjectImpl(NetworkReplicatedObject& item, ScriptingObject* obj)
{
item.Dirty();
if (Hierarchy)
Hierarchy->DirtyObject(obj);
}
@@ -787,6 +805,7 @@ void InvokeObjectSpawn(const NetworkMessageObjectSpawn& msgData, const Guid& pre
{
// Server always knows the best so update ownership of the existing object
item.OwnerClientId = msgData.OwnerClientId;
item.RepCache.Clear();
if (item.Role == NetworkObjectRole::OwnedAuthoritative)
{
if (Hierarchy)
@@ -1442,6 +1461,7 @@ void NetworkReplicator::SetObjectOwnership(ScriptingObject* obj, uint32 ownerCli
item.OwnerClientId = ownerClientId;
item.LastOwnerFrame = 1;
item.Role = localRole;
item.RepCache.Clear();
SendObjectRoleMessage(item);
}
}
@@ -1449,11 +1469,11 @@ void NetworkReplicator::SetObjectOwnership(ScriptingObject* obj, uint32 ownerCli
{
// Allow to change local role of the object (except ownership)
#if !BUILD_RELEASE
if (localRole == NetworkObjectRole::OwnedAuthoritative)
{
LOG(Error, "Cannot change ownership of object (Id={}) to the remote client (Id={}) if the local role is set to OwnedAuthoritative.", obj->GetID(), ownerClientId);
return;
}
if (localRole == NetworkObjectRole::OwnedAuthoritative)
{
LOG(Error, "Cannot change ownership of object (Id={}) to the remote client (Id={}) if the local role is set to OwnedAuthoritative.", obj->GetID(), ownerClientId);
return;
}
#endif
if (Hierarchy && it->Item.Role == NetworkObjectRole::OwnedAuthoritative)
Hierarchy->RemoveObject(obj);
@@ -1864,10 +1884,28 @@ void NetworkInternal::NetworkReplicatorUpdate()
//NETWORK_REPLICATOR_LOG(Error, "[NetworkReplicator] Cannot serialize object {} of type {} (missing serialization logic)", item.ToString(), obj->GetType().ToString());
continue;
}
const uint32 size = stream->GetPosition();
if (size > MAX_uint16)
{
LOG(Error, "Too much data for object {} replication ({} bytes provided while limit is {}).", item.ToString(), size, MAX_uint16);
continue;
}
#if USE_NETWORK_REPLICATOR_CACHE
// Process replication cache to skip sending object data if it didn't change
if (item.RepCache.Data.Length() == size &&
item.RepCache.Mask == e.TargetClients &&
Platform::MemoryCompare(item.RepCache.Data.Get(), stream->GetBuffer(), size) == 0)
{
continue;
}
item.RepCache.Mask = e.TargetClients;
item.RepCache.Data.Copy(stream->GetBuffer(), size);
#endif
// TODO: use Unreliable for dynamic objects that are replicated every frame? (eg. player state)
constexpr NetworkChannelType repChannel = NetworkChannelType::Reliable;
// Send object to clients
const uint32 size = stream->GetPosition();
ASSERT(size <= MAX_uint16);
NetworkMessageObjectReplicate msgData;
msgData.OwnerFrame = NetworkManager::Frame;
Guid objectId = item.ObjectId, parentId = item.ParentId;
@@ -1908,9 +1946,9 @@ void NetworkInternal::NetworkReplicatorUpdate()
msg.WriteBytes(stream->GetBuffer(), msgDataSize);
uint32 dataSize = msgDataSize, messageSize = msg.Length;
if (isClient)
peer->EndSendMessage(NetworkChannelType::Unreliable, msg);
peer->EndSendMessage(repChannel, msg);
else
peer->EndSendMessage(NetworkChannelType::Unreliable, msg, CachedTargets);
peer->EndSendMessage(repChannel, msg, CachedTargets);
// Send all other parts
for (uint32 partIndex = 1; partIndex < partsCount; partIndex++)
@@ -1929,9 +1967,9 @@ void NetworkInternal::NetworkReplicatorUpdate()
dataSize += msgDataPart.PartSize;
dataStart += msgDataPart.PartSize;
if (isClient)
peer->EndSendMessage(NetworkChannelType::Unreliable, msg);
peer->EndSendMessage(repChannel, msg);
else
peer->EndSendMessage(NetworkChannelType::Unreliable, msg, CachedTargets);
peer->EndSendMessage(repChannel, msg, CachedTargets);
}
ASSERT_LOW_LAYER(dataStart == size);