Added high level networked multiplayer to Godot.

It's complete, but absolutely and completely untested, undocumented and NSFW.
Have fun :-)

core/io/networked_multiplayer_peer.h

@@ -32,6 +32,8 @@ public:
 	virtual StringName get_packet_peer() const=0;
 	virtual int get_packet_channel() const=0;
 
+	virtual bool is_server() const=0;
+
 	virtual void poll()=0;
 
 	virtual ConnectionStatus get_connection_status() const=0;

modules/enet/networked_multiplayer_enet.cpp

@@ -81,6 +81,8 @@ Error NetworkedMultiplayerENet::create_client(const IP_Address& p_ip,int p_port,
 	//technically safe to ignore the peer or anything else.
 
 	connection_status=CONNECTION_CONNECTING;
+	active=true;
+	server=false;
 
 	return OK;
 }
@@ -144,7 +146,13 @@ void NetworkedMultiplayerENet::poll(){
 	}
 }
 
-void NetworkedMultiplayerENet::disconnect() {
+bool NetworkedMultiplayerENet::is_server() const {
+	ERR_FAIL_COND_V(!active,false);
+
+	return server;
+}
+
+void NetworkedMultiplayerENet::close_connection() {
 
 	ERR_FAIL_COND(!active);
 
@@ -258,6 +266,6 @@ NetworkedMultiplayerENet::NetworkedMultiplayerENet(){
 NetworkedMultiplayerENet::~NetworkedMultiplayerENet(){
 
 	if (active) {
-		disconnect();
+		close_connection();
 	}
 }

modules/enet/networked_multiplayer_enet.h

@@ -52,10 +52,12 @@ public:
 	Error create_server(int p_port, int p_max_clients=32, int p_max_channels=1, int p_in_bandwidth=0, int p_out_bandwidth=0);
 	Error create_client(const IP_Address& p_ip,int p_port, int p_max_channels=1, int p_in_bandwidth=0, int p_out_bandwidth=0);
 
-	void disconnect();
+	void close_connection();
 
 	virtual void poll();
 
+	virtual bool is_server() const;
+
 	virtual int get_available_packet_count() const;
 	virtual Error get_packet(const uint8_t **r_buffer,int &r_buffer_size) const; ///< buffer is GONE after next get_packet
 	virtual Error put_packet(const uint8_t *p_buffer,int p_buffer_size);

scene/main/node.cpp

@@ -36,6 +36,7 @@
 #include "instance_placeholder.h"
 
 VARIANT_ENUM_CAST(Node::PauseMode);
+VARIANT_ENUM_CAST(Node::NetworkMode);
 
 
 
@@ -77,6 +78,16 @@ void Node::_notification(int p_notification) {
 				data.pause_owner=this;
 			}
 
+			if (data.network_mode==NETWORK_MODE_INHERIT) {
+
+				if (data.parent)
+					data.network_owner=data.parent->data.network_owner;
+				else
+					data.network_owner=NULL;
+			} else {
+				data.network_owner=this;
+			}
+
 			if (data.input)
 				add_to_group("_vp_input"+itos(get_viewport()->get_instance_ID()));
 			if (data.unhandled_input)
@@ -97,6 +108,20 @@ void Node::_notification(int p_notification) {
 			if (data.unhandled_key_input)
 				remove_from_group("_vp_unhandled_key_input"+itos(get_viewport()->get_instance_ID()));
 
+
+			data.pause_owner=NULL;
+			data.network_owner=NULL;
+			if (data.path_cache) {
+				memdelete(data.path_cache);
+				data.path_cache=NULL;
+			}
+		} break;
+		case NOTIFICATION_PATH_CHANGED: {
+
+			if (data.path_cache) {
+				memdelete(data.path_cache);
+				data.path_cache=NULL;
+			}
 		} break;
 		case NOTIFICATION_READY: {
 
@@ -412,6 +437,200 @@ void Node::_propagate_pause_owner(Node*p_owner) {
 	}
 }
 
+void Node::set_network_mode(NetworkMode p_mode) {
+
+	if (data.network_mode==p_mode)
+		return;
+
+	bool prev_inherits=data.network_mode==NETWORK_MODE_INHERIT;
+	data.network_mode=p_mode;
+	if (!is_inside_tree())
+		return; //pointless
+	if ((data.network_mode==NETWORK_MODE_INHERIT) == prev_inherits)
+		return; ///nothing changed
+
+	Node *owner=NULL;
+
+	if (data.network_mode==NETWORK_MODE_INHERIT) {
+
+		if (data.parent)
+			owner=data.parent->data.network_owner;
+	} else {
+		owner=this;
+	}
+
+	_propagate_network_owner(owner);
+
+
+
+}
+
+Node::NetworkMode Node::get_network_mode() const {
+
+	return data.network_mode;
+}
+
+bool Node::is_network_master() const {
+
+	ERR_FAIL_COND_V(!is_inside_tree(),false);
+
+	switch(data.network_mode) {
+		case NETWORK_MODE_INHERIT: {
+
+			if (data.network_owner)
+				return data.network_owner->is_network_master();
+			else
+				return get_tree()->is_network_server();
+		} break;
+		case NETWORK_MODE_MASTER: {
+
+			return true;
+		} break;
+		case NETWORK_MODE_SLAVE: {
+			return false;
+		} break;
+	}
+
+	return false;
+}
+
+void Node::allow_remote_call(const StringName& p_method) {
+
+	data.allowed_remote_calls.insert(p_method);
+}
+
+void Node::disallow_remote_call(const StringName& p_method){
+
+	data.allowed_remote_calls.erase(p_method);
+
+}
+
+void Node::allow_remote_set(const StringName& p_property){
+
+	data.allowed_remote_set.insert(p_property);
+
+}
+void Node::disallow_remote_set(const StringName& p_property){
+
+	data.allowed_remote_set.erase(p_property);
+}
+
+
+void Node::_propagate_network_owner(Node*p_owner) {
+
+	if (data.network_mode!=NETWORK_MODE_INHERIT)
+		return;
+	data.network_owner=p_owner;
+	for(int i=0;i<data.children.size();i++) {
+
+		data.children[i]->_propagate_network_owner(p_owner);
+	}
+}
+
+void Node::remote_call_reliable(const StringName& p_method,VARIANT_ARG_DECLARE) {
+
+
+	VARIANT_ARGPTRS;
+
+	int argc=0;
+	for(int i=0;i<VARIANT_ARG_MAX;i++) {
+		if (argptr[i]->get_type()==Variant::NIL)
+			break;
+		argc++;
+	}
+
+	remote_call_reliablep(p_method,argptr,argc);
+}
+
+void Node::remote_call_reliablep(const StringName& p_method,const Variant** p_arg,int p_argcount){
+
+	ERR_FAIL_COND(!is_inside_tree());
+	get_tree()->_remote_call(this,true,false,p_method,p_arg,p_argcount);
+}
+
+void Node::remote_call_unreliable(const StringName& p_method,VARIANT_ARG_DECLARE){
+
+	VARIANT_ARGPTRS;
+
+	int argc=0;
+	for(int i=0;i<VARIANT_ARG_MAX;i++) {
+		if (argptr[i]->get_type()==Variant::NIL)
+			break;
+		argc++;
+	}
+
+	remote_call_unreliablep(p_method,argptr,argc);
+
+}
+
+void Node::remote_call_unreliablep(const StringName& p_method,const Variant** p_arg,int p_argcount){
+
+	ERR_FAIL_COND(!is_inside_tree());
+
+	get_tree()->_remote_call(this,false,false,p_method,p_arg,p_argcount);
+}
+
+void Node::remote_set_reliable(const StringName& p_property,const Variant& p_value) {
+
+
+	ERR_FAIL_COND(!is_inside_tree());
+	const Variant *ptr=&p_value;
+
+	get_tree()->_remote_call(this,true,true,p_property,&ptr,1);
+}
+
+void Node::remote_set_unreliable(const StringName& p_property,const Variant& p_value){
+
+	ERR_FAIL_COND(!is_inside_tree());
+	const Variant *ptr=&p_value;
+
+	get_tree()->_remote_call(this,false,true,p_property,&ptr,1);
+}
+
+Variant Node::_remote_call_reliable_bind(const Variant** p_args, int p_argcount, Variant::CallError& r_error) {
+
+	if (p_argcount<1) {
+		r_error.error=Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
+		r_error.argument=1;
+		return Variant();
+	}
+
+	if (p_args[0]->get_type()!=Variant::STRING) {
+		r_error.error=Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
+		r_error.argument=0;
+		r_error.expected=Variant::STRING;
+		return Variant();
+	}
+
+	StringName method = *p_args[0];
+
+	remote_call_reliablep(method,&p_args[1],p_argcount-1);
+
+}
+
+
+Variant Node::_remote_call_unreliable_bind(const Variant** p_args, int p_argcount, Variant::CallError& r_error) {
+
+	if (p_argcount<1) {
+		r_error.error=Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
+		r_error.argument=1;
+		return Variant();
+	}
+
+	if (p_args[0]->get_type()!=Variant::STRING) {
+		r_error.error=Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
+		r_error.argument=0;
+		r_error.expected=Variant::STRING;
+		return Variant();
+	}
+
+	StringName method = *p_args[0];
+
+	remote_call_unreliablep(method,&p_args[1],p_argcount-1);
+
+}
+
+
 bool Node::can_process() const {
 
 	ERR_FAIL_COND_V( !is_inside_tree(), false );
@@ -567,6 +786,8 @@ void Node::set_name(const String& p_name) {
 		data.parent->_validate_child_name(this);
 	}
 
+	propagate_notification(NOTIFICATION_PATH_CHANGED);
+
 	if (is_inside_tree()) {
 
 		emit_signal("renamed");
@@ -1210,6 +1431,10 @@ NodePath Node::get_path_to(const Node *p_node) const {
 NodePath Node::get_path() const {
 
 	ERR_FAIL_COND_V(!is_inside_tree(),NodePath());
+
+	if (data.path_cache)
+		return *data.path_cache;
+
 	const Node *n = this;
 
 	Vector<StringName> path;
@@ -1221,7 +1446,9 @@ NodePath Node::get_path() const {
 
 	path.invert();
 
-	return NodePath( path, true );
+	data.path_cache = memnew( NodePath( path, true ) );
+
+	return *data.path_cache;
 }
 
 bool Node::is_in_group(const StringName& p_identifier) const {
@@ -2212,8 +2439,16 @@ void Node::_bind_methods() {
 
 	ObjectTypeDB::bind_method(_MD("queue_free"),&Node::queue_delete);
 
+	ObjectTypeDB::bind_method(_MD("set_network_mode","mode"),&Node::set_network_mode);
+	ObjectTypeDB::bind_method(_MD("get_network_mode"),&Node::get_network_mode);
+
+	ObjectTypeDB::bind_method(_MD("is_network_master"),&Node::is_network_master);
 
+	ObjectTypeDB::bind_method(_MD("allow_remote_call","method"),&Node::allow_remote_call);
+	ObjectTypeDB::bind_method(_MD("disallow_remote_call","method"),&Node::disallow_remote_call);
 
+	ObjectTypeDB::bind_method(_MD("allow_remote_set","method"),&Node::allow_remote_set);
+	ObjectTypeDB::bind_method(_MD("disallow_remote_set","method"),&Node::disallow_remote_set);
 
 #ifdef TOOLS_ENABLED
 	ObjectTypeDB::bind_method(_MD("_set_import_path","import_path"),&Node::set_import_path);
@@ -2222,6 +2457,23 @@ void Node::_bind_methods() {
 
 #endif
 
+	{
+		MethodInfo mi;
+		mi.name="remote_call_reliable";
+		mi.arguments.push_back( PropertyInfo( Variant::STRING, "method"));
+
+
+		ObjectTypeDB::bind_native_method(METHOD_FLAGS_DEFAULT,"remote_call_reliable",&Node::_remote_call_reliable_bind,mi);
+
+		mi.name="remote_call_unreliable";
+		ObjectTypeDB::bind_native_method(METHOD_FLAGS_DEFAULT,"remote_call_unreliable",&Node::_remote_call_unreliable_bind,mi);
+
+	}
+
+	ObjectTypeDB::bind_method(_MD("remote_set_reliable","property","value:Variant"),&Node::remote_set_reliable);
+	ObjectTypeDB::bind_method(_MD("remote_set_unreliable","property","value:Variant"),&Node::remote_set_unreliable);
+
+
 	BIND_CONSTANT( NOTIFICATION_ENTER_TREE );
 	BIND_CONSTANT( NOTIFICATION_EXIT_TREE );
 	BIND_CONSTANT( NOTIFICATION_MOVED_IN_PARENT );
@@ -2236,6 +2488,8 @@ void Node::_bind_methods() {
 	BIND_CONSTANT( NOTIFICATION_INSTANCED );
 	BIND_CONSTANT( NOTIFICATION_DRAG_BEGIN );
 	BIND_CONSTANT( NOTIFICATION_DRAG_END );
+	BIND_CONSTANT( NOTIFICATION_PATH_CHANGED);
+
 
 
 
@@ -2252,6 +2506,7 @@ void Node::_bind_methods() {
 	//ADD_PROPERTYNZ( PropertyInfo( Variant::BOOL, "process/input" ), _SCS("set_process_input"),_SCS("is_processing_input" ) );
 	//ADD_PROPERTYNZ( PropertyInfo( Variant::BOOL, "process/unhandled_input" ), _SCS("set_process_unhandled_input"),_SCS("is_processing_unhandled_input" ) );
 	ADD_PROPERTYNZ( PropertyInfo( Variant::INT, "process/pause_mode",PROPERTY_HINT_ENUM,"Inherit,Stop,Process" ), _SCS("set_pause_mode"),_SCS("get_pause_mode" ) );
+	ADD_PROPERTYNZ( PropertyInfo( Variant::INT, "process/network_mode",PROPERTY_HINT_ENUM,"Inherit,Master,Slave" ), _SCS("set_network_mode"),_SCS("get_network_mode" ) );
 	ADD_PROPERTYNZ( PropertyInfo( Variant::BOOL, "editor/display_folded",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR ), _SCS("set_display_folded"),_SCS("is_displayed_folded" ) );
 
 	BIND_VMETHOD( MethodInfo("_process",PropertyInfo(Variant::REAL,"delta")) );
@@ -2286,11 +2541,15 @@ Node::Node() {
 	data.unhandled_key_input=false;
 	data.pause_mode=PAUSE_MODE_INHERIT;
 	data.pause_owner=NULL;
+	data.network_mode=NETWORK_MODE_INHERIT;
+	data.network_owner=NULL;
+	data.path_cache=NULL;
 	data.parent_owned=false;
 	data.in_constructor=true;
 	data.viewport=NULL;
 	data.use_placeholder=false;
 	data.display_folded=false;
+
 }
 
 Node::~Node() {

scene/main/node.h

@@ -53,6 +53,12 @@ public:
 		PAUSE_MODE_PROCESS
 	};
 
+	enum NetworkMode {
+
+		NETWORK_MODE_INHERIT,
+		NETWORK_MODE_MASTER,
+		NETWORK_MODE_SLAVE
+	};
 
 	struct Comparator {
 
@@ -68,6 +74,7 @@ private:
 		GroupData() { persistent=false; }
 	};
 
+
 	struct Data {
 
 		String filename;
@@ -98,6 +105,13 @@ private:
 
 		PauseMode pause_mode;
 		Node *pause_owner;
+
+		NetworkMode network_mode;
+		Node *network_owner;
+		Set<StringName> allowed_remote_calls;
+		Set<StringName> allowed_remote_set;
+
+
 		// variables used to properly sort the node when processing, ignored otherwise
 		//should move all the stuff below to bits
 		bool fixed_process;
@@ -113,6 +127,8 @@ private:
 
 		bool display_folded;
 
+		mutable NodePath *path_cache;
+
 	} data;
 
 
@@ -134,6 +150,7 @@ private:
 	void _propagate_validate_owner();
 	void _print_stray_nodes();
 	void _propagate_pause_owner(Node*p_owner);
+	void _propagate_network_owner(Node*p_owner);
 	Array _get_node_and_resource(const NodePath& p_path);
 
 	void _duplicate_signals(const Node* p_original,Node* p_copy) const;
@@ -143,6 +160,9 @@ private:
 	Array _get_children() const;
 	Array _get_groups() const;
 
+	Variant _remote_call_reliable_bind(const Variant** p_args, int p_argcount, Variant::CallError& r_error);
+	Variant _remote_call_unreliable_bind(const Variant** p_args, int p_argcount, Variant::CallError& r_error);
+
 friend class SceneTree;
 
 	void _set_tree(SceneTree *p_tree);
@@ -186,6 +206,7 @@ public:
 		NOTIFICATION_INSTANCED=20,
 		NOTIFICATION_DRAG_BEGIN=21,
 		NOTIFICATION_DRAG_END=22,
+		NOTIFICATION_PATH_CHANGED=23,
 	};
 
 	/* NODE/TREE */
@@ -331,7 +352,27 @@ public:
 
 	void set_display_folded(bool p_folded);
 	bool is_displayed_folded() const;
-	/* CANVAS */
+	/* NETWORK */
+
+	void set_network_mode(NetworkMode p_mode);
+	NetworkMode get_network_mode() const;
+	bool is_network_master() const;
+
+	void allow_remote_call(const StringName& p_method);
+	void disallow_remote_call(const StringName& p_method);
+
+	void allow_remote_set(const StringName& p_property);
+	void disallow_remote_set(const StringName& p_property);
+
+	void remote_call_reliable(const StringName& p_method,VARIANT_ARG_DECLARE);
+	void remote_call_reliablep(const StringName& p_method,const Variant** p_arg,int p_argcount);
+
+	void remote_call_unreliable(const StringName& p_method,VARIANT_ARG_DECLARE);
+	void remote_call_unreliablep(const StringName& p_method,const Variant** p_arg,int p_argcount);
+
+	void remote_set_reliable(const StringName& p_property,const Variant& p_value);
+	void remote_set_unreliable(const StringName& p_property,const Variant& p_value);
+
 
 	Node();
 	~Node();

scene/main/scene_main_loop.cpp

@@ -545,6 +545,8 @@ bool SceneTree::idle(float p_time){
 
 	idle_process_time=p_time;
 
+	_network_poll();
+
 	emit_signal("idle_frame");
 
 	_flush_transform_notifications();
@@ -1655,6 +1657,322 @@ Ref<SceneTreeTimer> SceneTree::create_timer(float p_delay_sec) {
 	return stt;
 }
 
+void SceneTree::_network_peer_connected(const StringName& p_id) {
+
+
+	connected_peers.insert(p_id);
+	path_get_cache.insert(p_id,PathGetCache());
+	emit_signal("network_peer_connected",p_id);
+}
+
+void SceneTree::_network_peer_disconnected(const StringName& p_id) {
+
+	connected_peers.erase(p_id);
+	path_get_cache.erase(p_id); //I no longer need your cache, sorry
+	emit_signal("network_peer_disconnected",p_id);
+}
+
+void SceneTree::set_network_peer(const Ref<NetworkedMultiplayerPeer>& p_network_peer) {
+	if (network_peer.is_valid()) {
+		network_peer->disconnect("peer_connected",this,"_network_peer_connected");
+		network_peer->disconnect("peer_disconnected",this,"_network_peer_disconnected");
+		connected_peers.clear();
+		path_get_cache.clear();
+		path_send_cache.clear();
+		last_send_cache_id=1;
+	}
+
+	ERR_EXPLAIN("Supplied NetworkedNetworkPeer must be connecting or connected.");
+	ERR_FAIL_COND(p_network_peer.is_valid() && p_network_peer->get_connection_status()==NetworkedMultiplayerPeer::CONNECTION_DISCONNECTED);
+
+	network_peer=p_network_peer;
+
+	if (network_peer.is_valid()) {
+		network_peer->connect("peer_connected",this,"_network_peer_connected");
+		network_peer->connect("peer_disconnected",this,"_network_peer_disconnected");
+	}
+}
+
+bool SceneTree::is_network_server() const {
+
+	ERR_FAIL_COND_V(!network_peer.is_valid(),false);
+	return network_peer->is_server();
+
+}
+
+void SceneTree::_remote_call(Node* p_from, bool p_reliable, bool p_set, const StringName& p_name, const Variant** p_arg, int p_argcount) {
+
+	if (network_peer.is_null()) {
+		ERR_EXPLAIN("Attempt to remote call/set when networking is not active in SceneTree.");
+		ERR_FAIL();
+	}
+
+	if (network_peer->get_connection_status()==NetworkedMultiplayerPeer::CONNECTION_CONNECTING) {
+		ERR_EXPLAIN("Attempt to remote call/set when networking is not connected yet in SceneTree.");
+		ERR_FAIL();
+	}
+
+	if (network_peer->get_connection_status()==NetworkedMultiplayerPeer::CONNECTION_DISCONNECTED) {
+		ERR_EXPLAIN("Attempt to remote call/set when networking is disconnected.");
+		ERR_FAIL();
+	}
+
+	NodePath from_path = p_from->get_path();
+	ERR_FAIL_COND(from_path.is_empty());
+
+	//create base packet
+	Array message;
+
+	message.resize(3+p_argcount); //alloc size for args
+
+	//set message type
+	if (p_set) {
+		message[0]=NETWORK_COMMAND_REMOTE_SET;
+	} else {
+		message[0]=NETWORK_COMMAND_REMOTE_CALL;
+	}
+
+	//set message name
+	message[2]=p_name;
+
+	//set message args
+	for(int i=0;i<p_argcount;i++) {
+		message[3+i]=*p_arg[i];
+	}
+
+	//see if the path is cached
+	PathSentCache *psc = path_send_cache.getptr(from_path);
+	if (!psc) {
+		//path is not cached, create
+		path_send_cache[from_path]=PathSentCache();
+		psc = path_send_cache.getptr(from_path);
+		psc->id=last_send_cache_id++;
+
+	}
+
+	//see if all peers have cached path (is so, call can be fast)
+	bool has_all_peers=true;
+
+	List<StringName> peers_to_add; //if one is missing, take note to add it
+
+	for (Set<StringName>::Element *E=connected_peers.front();E;E=E->next()) {
+
+		Map<StringName,bool>::Element *F = psc->confirmed_peers.find(E->get());
+
+		if (!F || F->get()==false) {
+			//path was not cached, or was cached but is unconfirmed
+			if (!F) {
+				//not cached at all, take note
+				peers_to_add.push_back(E->get());
+			}
+
+			has_all_peers=false;
+			break;
+		}
+	}
+
+	//those that need to be added, send a message for this
+
+	for (List<StringName>::Element *E=peers_to_add.front();E;E=E->next()) {
+
+		Array add_path_message;
+		add_path_message.resize(3);
+		add_path_message[0]=NETWORK_COMMAND_SIMPLIFY_PATH;
+		add_path_message[1]=from_path;
+		add_path_message[2]=psc->id;
+
+		network_peer->set_target_peer(E->get()); //to all of you
+		network_peer->set_transfer_mode(NetworkedMultiplayerPeer::TRANSFER_MODE_ORDERED);
+		network_peer->put_var(add_path_message); //a message with love
+
+		psc->confirmed_peers.insert(E->get(),false); //insert into confirmed, but as false since it was not confirmed
+	}
+
+	//take chance and set transfer mode, since all send methods will use it
+	network_peer->set_transfer_mode(p_reliable ? NetworkedMultiplayerPeer::TRANSFER_MODE_ORDERED : NetworkedMultiplayerPeer::TRANSFER_MODE_UNRELIABLE);
+
+	if (has_all_peers) {
+
+		//they all have verified paths, so send fast
+		message[1]=psc->id;
+
+		network_peer->set_target_peer(StringName()); //to all of you
+		network_peer->put_var(message); //a message with love
+	} else {
+		//not all verified path, so send one by one
+		for (Set<StringName>::Element *E=connected_peers.front();E;E=E->next()) {
+
+			Map<StringName,bool>::Element *F = psc->confirmed_peers.find(E->get());
+			ERR_CONTINUE(!F);//should never happen
+
+			network_peer->set_target_peer(E->get()); //to this one specifically
+
+			if (F->get()==true) {
+				//this one confirmed path, so use id
+				message[1]=psc->id;
+			} else {
+				//this one did not confirm path yet, so use entire path (sorry!)
+				message[1]=from_path;
+			}
+
+			network_peer->put_var(message);
+		}
+	}
+}
+
+
+void SceneTree::_network_process_packet(const StringName& p_from,const Array& p_packet) {
+
+	ERR_FAIL_COND(p_packet.empty());
+
+	int packet_type = p_packet[0];
+
+	switch(packet_type) {
+
+		case NETWORK_COMMAND_REMOTE_CALL:
+		case NETWORK_COMMAND_REMOTE_SET: {
+
+			ERR_FAIL_COND(p_packet.size()<3);
+			Variant target = p_packet[1];
+			Node* node=NULL;
+
+			if (target.get_type()==Variant::NODE_PATH) {
+				NodePath np = target;
+				node = get_root()->get_node(np);
+				if (node==NULL) {
+					ERR_EXPLAIN("Failed to get path from RPC: "+String(np));
+					ERR_FAIL_COND(node==NULL);
+				}
+			} else if (target.get_type()==Variant::INT) {
+
+				int id = target;
+
+				Map<StringName,PathGetCache>::Element *E=path_get_cache.find(p_from);
+				ERR_FAIL_COND(!E);
+
+				Map<int,PathGetCache::NodeInfo>::Element *F=E->get().nodes.find(id);
+				ERR_FAIL_COND(!F);
+
+				PathGetCache::NodeInfo *ni = &F->get();
+				//do proper caching later
+
+				node = get_root()->get_node(ni->path);
+				if (node==NULL) {
+					ERR_EXPLAIN("Failed to get cached path from RPC: "+String(ni->path));
+					ERR_FAIL_COND(node==NULL);
+				}
+
+
+			} else {
+				ERR_FAIL();
+			}
+
+			StringName name = p_packet[2];
+
+			if (packet_type==NETWORK_COMMAND_REMOTE_CALL) {
+
+				int argc = p_packet.size()-3;
+				Vector<Variant> args;
+				Vector<const Variant*> argp;
+				args.resize(argc);
+				argp.resize(argc);
+
+				for(int i=0;i<argc;i++) {
+					args[i]=p_packet[3+i];
+					argp[i]=&args[i];
+				}
+
+				Variant::CallError ce;
+
+				node->call(name,argp.ptr(),argc,ce);
+				if (ce.error!=Variant::CallError::CALL_OK) {
+					String error = Variant::get_call_error_text(node,name,argp.ptr(),argc,ce);
+					ERR_PRINTS(error);
+				}
+
+			} else {
+
+
+				ERR_FAIL_COND(p_packet.size()!=4);
+				Variant value = p_packet[3];
+				bool valid;
+
+				node->set(name,value,&valid);
+				if (!valid) {
+					String error = "Error setting remote property '"+String(name)+"', not found in object of type "+node->get_type();
+					ERR_PRINTS(error);
+				}
+			}
+
+		} break;
+		case NETWORK_COMMAND_SIMPLIFY_PATH: {
+
+			ERR_FAIL_COND(p_packet.size()!=3);
+			NodePath path = p_packet[1];
+			int id = p_packet[2];
+
+			if (!path_get_cache.has(p_from)) {
+				path_get_cache[p_from]=PathGetCache();
+			}
+
+			PathGetCache::NodeInfo ni;
+			ni.path=path;
+			ni.instance=0;
+
+			path_get_cache[p_from].nodes[id]=ni;
+
+			network_peer->set_transfer_mode(NetworkedMultiplayerPeer::TRANSFER_MODE_ORDERED);
+			network_peer->set_target_peer(p_from);
+
+			Array message;
+			message.resize(2);
+			message[0]=NETWORK_COMMAND_CONFIRM_PATH;
+			message[1]=path;
+
+			network_peer->put_var(message);
+		} break;
+		case NETWORK_COMMAND_CONFIRM_PATH: {
+			ERR_FAIL_COND(p_packet.size()!=2);
+			NodePath path = p_packet[1];
+
+			PathSentCache *psc = path_send_cache.getptr(path);
+			ERR_FAIL_COND(!psc);
+
+			Map<StringName,bool>::Element *E=psc->confirmed_peers.find(p_from);
+			ERR_FAIL_COND(!E);
+			E->get()=true;
+		} break;
+	}
+
+}
+
+void SceneTree::_network_poll() {
+
+	if (!network_peer.is_valid())
+		return;
+
+	network_peer->poll();
+
+	while(network_peer->get_available_packet_count()) {
+
+		StringName sender = network_peer->get_packet_peer();
+		Variant packet;
+		Error err = network_peer->get_var(packet);
+		if (err!=OK) {
+			ERR_PRINT("Error getting packet!");
+		}
+		if (packet.get_type()!=Variant::ARRAY) {
+
+			ERR_PRINT("Error getting packet! (not an array)");
+		}
+
+		_network_process_packet(sender,packet);
+	}
+
+
+}
+
+
 void SceneTree::_bind_methods() {
 
 
@@ -1722,6 +2040,12 @@ void SceneTree::_bind_methods() {
 
 	ObjectTypeDB::bind_method(_MD("_change_scene"),&SceneTree::_change_scene);
 
+
+	ObjectTypeDB::bind_method(_MD("set_network_peer","peer:NetworkedMultiplayerPeer"),&SceneTree::set_network_peer);
+	ObjectTypeDB::bind_method(_MD("is_network_server","is_network_server"),&SceneTree::is_network_server);
+	ObjectTypeDB::bind_method(_MD("_network_peer_connected"),&SceneTree::_network_peer_connected);
+	ObjectTypeDB::bind_method(_MD("_network_peer_disconnected"),&SceneTree::_network_peer_disconnected);
+
 	ADD_SIGNAL( MethodInfo("tree_changed") );
 	ADD_SIGNAL( MethodInfo("node_removed",PropertyInfo( Variant::OBJECT, "node") ) );
 	ADD_SIGNAL( MethodInfo("screen_resized") );
@@ -1731,6 +2055,8 @@ void SceneTree::_bind_methods() {
 	ADD_SIGNAL( MethodInfo("fixed_frame"));
 
 	ADD_SIGNAL( MethodInfo("files_dropped",PropertyInfo(Variant::STRING_ARRAY,"files"),PropertyInfo(Variant::INT,"screen")) );
+	ADD_SIGNAL( MethodInfo("network_peer_connected",PropertyInfo(Variant::STRING,"id")));
+	ADD_SIGNAL( MethodInfo("network_peer_disconnected",PropertyInfo(Variant::STRING,"id")));
 
 	BIND_CONSTANT( GROUP_CALL_DEFAULT );
 	BIND_CONSTANT( GROUP_CALL_REVERSE );
@@ -1831,6 +2157,8 @@ SceneTree::SceneTree() {
 
 	live_edit_root=NodePath("/root");
 
+	last_send_cache_id=1;
+
 #endif
 
 

scene/main/scene_main_loop.h

@@ -35,6 +35,9 @@
 #include "scene/resources/world_2d.h"
 #include "os/thread_safe.h"
 #include "self_list.h"
+#include "io/networked_multiplayer_peer.h"
+
+
 /**
 	@author Juan Linietsky <[email protected]>
 */
@@ -173,9 +176,53 @@ private:
 
 	List<Ref<SceneTreeTimer> > timers;
 
+
+	///network///
+
+	enum NetworkCommands {
+		NETWORK_COMMAND_REMOTE_CALL,
+		NETWORK_COMMAND_REMOTE_SET,
+		NETWORK_COMMAND_SIMPLIFY_PATH,
+		NETWORK_COMMAND_CONFIRM_PATH,
+	};
+
+	Ref<NetworkedMultiplayerPeer> network_peer;
+
+	Set<StringName> connected_peers;
+	void _network_peer_connected(const StringName& p_id);
+	void _network_peer_disconnected(const StringName& p_id);
+
+	//path sent caches
+	struct PathSentCache {
+		Map<StringName,bool> confirmed_peers;
+		int id;
+	};
+
+	HashMap<NodePath,PathSentCache> path_send_cache;
+	int last_send_cache_id;
+
+	//path get caches
+	struct PathGetCache {
+		struct NodeInfo {
+			NodePath path;
+			ObjectID instance;
+		};
+
+		Map<int,NodeInfo> nodes;
+	};
+
+	Map<StringName,PathGetCache> path_get_cache;
+
+	void _network_process_packet(const StringName &p_from, const Array& p_packet);
+	void _network_poll();
+
 	static SceneTree *singleton;
 friend class Node;
 
+
+
+	void _remote_call(Node* p_from,bool p_reliable,bool p_set,const StringName& p_name,const Variant** p_arg,int p_argcount);
+
 	void tree_changed();
 	void node_removed(Node *p_node);
 
@@ -251,6 +298,7 @@ friend class Viewport;
 #endif
 protected:
 
+
 	void _notification(int p_notification);
 	static void _bind_methods();
 
@@ -366,6 +414,11 @@ public:
 
 	void drop_files(const Vector<String>& p_files,int p_from_screen=0);
 
+	//network API
+
+	void set_network_peer(const Ref<NetworkedMultiplayerPeer>& p_network_peer);
+	bool is_network_server() const;
+
 	SceneTree();
 	~SceneTree();