From 32a62af6485418120da150930a7ea0f9b8e1be1c Mon Sep 17 00:00:00 2001
From: Fabio Alessandrelli <fabio.alessandrelli@gmail.com>
Date: Fri, 30 Sep 2022 22:35:56 +0200
Subject: [MP] Allow multiple synchronizers per node.

The same node can now be controlled by multiple synchronizers at once.
Spawn visibility is composed in OR across multiple synchronizers (i.e.
if any synchronizer is visible to the peer, the object will be spawned).

Synchronizers controlling spawned nodes can now have a different
authority then the one spawning the node, in that case, the spawn
variables for that specific synchronizer are simply ignored (other
synchronizers with the same authority of the spawner will correctly
synchronize variables on spawn).

The SceneReplicationState class has been completly removed, since it was
bloating the implementation, the state is now simply stored in the
SceneReplicationInterface.
---
 modules/multiplayer/multiplayer_synchronizer.cpp | 46 +++++++++++++++++++++---
 1 file changed, 41 insertions(+), 5 deletions(-)

(limited to 'modules/multiplayer/multiplayer_synchronizer.cpp')

diff --git a/modules/multiplayer/multiplayer_synchronizer.cpp b/modules/multiplayer/multiplayer_synchronizer.cpp
index 2c3ebccaeb..9755f426d5 100644
--- a/modules/multiplayer/multiplayer_synchronizer.cpp
+++ b/modules/multiplayer/multiplayer_synchronizer.cpp
@@ -48,6 +48,8 @@ void MultiplayerSynchronizer::_stop() {
 		return;
 	}
 #endif
+	root_node_cache = ObjectID();
+	reset();
 	Node *node = is_inside_tree() ? get_node_or_null(root_path) : nullptr;
 	if (node) {
 		get_multiplayer()->object_configuration_remove(node, this);
@@ -60,8 +62,11 @@ void MultiplayerSynchronizer::_start() {
 		return;
 	}
 #endif
+	root_node_cache = ObjectID();
+	reset();
 	Node *node = is_inside_tree() ? get_node_or_null(root_path) : nullptr;
 	if (node) {
+		root_node_cache = node->get_instance_id();
 		get_multiplayer()->object_configuration_add(node, this);
 		_update_process();
 	}
@@ -94,6 +99,40 @@ void MultiplayerSynchronizer::_update_process() {
 	}
 }
 
+Node *MultiplayerSynchronizer::get_root_node() {
+	return root_node_cache.is_valid() ? Object::cast_to<Node>(ObjectDB::get_instance(root_node_cache)) : nullptr;
+}
+
+void MultiplayerSynchronizer::reset() {
+	net_id = 0;
+	last_sync_msec = 0;
+	last_inbound_sync = 0;
+}
+
+uint32_t MultiplayerSynchronizer::get_net_id() const {
+	return net_id;
+}
+
+void MultiplayerSynchronizer::set_net_id(uint32_t p_net_id) {
+	net_id = p_net_id;
+}
+
+bool MultiplayerSynchronizer::update_outbound_sync_time(uint64_t p_msec) {
+	if (p_msec >= last_sync_msec + interval_msec) {
+		last_sync_msec = p_msec;
+		return true;
+	}
+	return false;
+}
+
+bool MultiplayerSynchronizer::update_inbound_sync_time(uint16_t p_network_time) {
+	if (p_network_time <= last_inbound_sync && last_inbound_sync - p_network_time < 32767) {
+		return false;
+	}
+	last_inbound_sync = p_network_time;
+	return true;
+}
+
 PackedStringArray MultiplayerSynchronizer::get_configuration_warnings() const {
 	PackedStringArray warnings = Node::get_configuration_warnings();
 
@@ -263,10 +302,6 @@ double MultiplayerSynchronizer::get_replication_interval() const {
 	return double(interval_msec) / 1000.0;
 }
 
-uint64_t MultiplayerSynchronizer::get_replication_interval_msec() const {
-	return interval_msec;
-}
-
 void MultiplayerSynchronizer::set_replication_config(Ref<SceneReplicationConfig> p_config) {
 	replication_config = p_config;
 }
@@ -299,10 +334,11 @@ NodePath MultiplayerSynchronizer::get_root_path() const {
 
 void MultiplayerSynchronizer::set_multiplayer_authority(int p_peer_id, bool p_recursive) {
 	Node *node = is_inside_tree() ? get_node_or_null(root_path) : nullptr;
-	if (!node) {
+	if (!node || get_multiplayer_authority() == p_peer_id) {
 		Node::set_multiplayer_authority(p_peer_id, p_recursive);
 		return;
 	}
+
 	get_multiplayer()->object_configuration_remove(node, this);
 	Node::set_multiplayer_authority(p_peer_id, p_recursive);
 	get_multiplayer()->object_configuration_add(node, this);
-- 
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