New sync RPC modes to match all combinations

core/io/multiplayer_api.cpp

@@ -42,6 +42,9 @@ _FORCE_INLINE_ bool _should_call_local(MultiplayerAPI::RPCMode mode, bool is_mas
 		case MultiplayerAPI::RPC_MODE_REMOTE: {
 			//do nothing also, no need to call local
 		} break;
+		case MultiplayerAPI::RPC_MODE_REMOTESYNC:
+		case MultiplayerAPI::RPC_MODE_MASTERSYNC:
+		case MultiplayerAPI::RPC_MODE_SLAVESYNC:
 		case MultiplayerAPI::RPC_MODE_SYNC: {
 			//call it, sync always results in call
 			return true;
@@ -67,12 +70,15 @@ _FORCE_INLINE_ bool _can_call_mode(Node *p_node, MultiplayerAPI::RPCMode mode, i
 		case MultiplayerAPI::RPC_MODE_REMOTE: {
 			return true;
 		} break;
+		case MultiplayerAPI::RPC_MODE_REMOTESYNC:
 		case MultiplayerAPI::RPC_MODE_SYNC: {
 			return true;
 		} break;
+		case MultiplayerAPI::RPC_MODE_MASTERSYNC:
 		case MultiplayerAPI::RPC_MODE_MASTER: {
 			return p_node->is_network_master();
 		} break;
+		case MultiplayerAPI::RPC_MODE_SLAVESYNC:
 		case MultiplayerAPI::RPC_MODE_SLAVE: {
 			return !p_node->is_network_master() && p_remote_id == p_node->get_network_master();
 		} break;
@@ -797,6 +803,9 @@ void MultiplayerAPI::_bind_methods() {
 	BIND_ENUM_CONSTANT(RPC_MODE_SYNC);
 	BIND_ENUM_CONSTANT(RPC_MODE_MASTER);
 	BIND_ENUM_CONSTANT(RPC_MODE_SLAVE);
+	BIND_ENUM_CONSTANT(RPC_MODE_REMOTESYNC);
+	BIND_ENUM_CONSTANT(RPC_MODE_MASTERSYNC);
+	BIND_ENUM_CONSTANT(RPC_MODE_SLAVESYNC);
 }
 
 MultiplayerAPI::MultiplayerAPI() {

core/io/multiplayer_api.h

@@ -94,6 +94,9 @@ public:
 		RPC_MODE_SYNC, // Using rpc() on it will call method / set property in all remote peers and locally
 		RPC_MODE_MASTER, // Using rpc() on it will call method on wherever the master is, be it local or remote
 		RPC_MODE_SLAVE, // Using rpc() on it will call method for all slaves
+		RPC_MODE_REMOTESYNC, // Same as RPC_MODE_SYNC, compatibility
+		RPC_MODE_MASTERSYNC, // Using rpc() on it will call method / set property in the master peer and locally
+		RPC_MODE_SLAVESYNC, // Using rpc() on it will call method / set property in all slave peers and locally
 	};
 
 	void poll();

doc/classes/MultiplayerAPI.xml

@@ -140,16 +140,25 @@
 			Used with [method Node.rpc_config] or [method Node.rset_config] to disable a method or property for all RPC calls, making it unavailable. Default for all methods.
 		</constant>
 		<constant name="RPC_MODE_REMOTE" value="1" enum="RPCMode">
-			Used with [method Node.rpc_config] or [method Node.rset_config] to set a method to be called or a property to be changed only on the remote end, not locally. Analogous to the [code]remote[/code] keyword.
+			Used with [method Node.rpc_config] or [method Node.rset_config] to set a method to be called or a property to be changed only on the remote end, not locally. Analogous to the [code]remote[/code] keyword. Calls and property changes are accepted from all remote peers, no matter if they are node's master or slaves.
 		</constant>
 		<constant name="RPC_MODE_SYNC" value="2" enum="RPCMode">
-			Used with [method Node.rpc_config] or [method Node.rset_config] to set a method to be called or a property to be changed both on the remote end and locally. Analogous to the [code]sync[/code] keyword.
+			Behave like [constant RPC_MODE_REMOTE] but also make the call or property change locally. Analogous to the [code]sync[/code] keyword.
 		</constant>
 		<constant name="RPC_MODE_MASTER" value="3" enum="RPCMode">
-			Used with [method Node.rpc_config] or [method Node.rset_config] to set a method to be called or a property to be changed only on the network master for this node. Analogous to the [code]master[/code] keyword. See [method Node.set_network_master].
+			Used with [method Node.rpc_config] or [method Node.rset_config] to set a method to be called or a property to be changed only on the network master for this node. Analogous to the [code]master[/code] keyword. Only accepts calls or property changes from the node's network slaves, see [method Node.set_network_master].
 		</constant>
 		<constant name="RPC_MODE_SLAVE" value="4" enum="RPCMode">
-			Used with [method Node.rpc_config] or [method Node.rset_config] to set a method to be called or a property to be changed only on slaves for this node. Analogous to the [code]slave[/code] keyword. See [method Node.set_network_master].
+			Used with [method Node.rpc_config] or [method Node.rset_config] to set a method to be called or a property to be changed only on slaves for this node. Analogous to the [code]slave[/code] keyword. Only accepts calls or property changes from the node's network master, see [method Node.set_network_master].
+		</constant>
+		<constant name="RPC_MODE_REMOTESYNC" value="5" enum="RPCMode">
+			Behave like [code]RPC_MODE_REMOTE[/code] but also make the call or property change locally. Same as [constant RPC_MODE_SYNC] which is only kept for compatibility. Analogous to the [code]remotesync[/code] keyword.
+		</constant>
+		<constant name="RPC_MODE_MASTERSYNC" value="6" enum="RPCMode">
+			Behave like [code]RPC_MODE_MASTER[/code] but also make the call or property change locally. Analogous to the [code]mastersync[/code] keyword.
+		</constant>
+		<constant name="RPC_MODE_SLAVESYNC" value="7" enum="RPCMode">
+			Behave like [code]RPC_MODE_SLAVE[/code] but also make the call or property change locally. Analogous to the [code]slavesync[/code] keyword.
 		</constant>
 	</constants>
 </class>