add options to control rollback and fps on standalone

Adds multi.cfg options to allow easy tweaking of standalone servers to better handle mods
with faster ships and/or weapons that don't behave reliably with rollback or lower fps.

Author: notimaginative

code/network/multi_options.cpp

@@ -318,6 +318,19 @@ void multi_options_read_config()
 							Multi_options_g.webapiPort = (ushort) result;
 						}
 					}
+				} else
+				// set framerate for standalone
+				if ( SETTING("+fps_cap") ) {
+					NEXT_TOKEN();
+					if (tok != nullptr) {
+						if ((atoi(tok) >= 15) && (atoi(tok) <= 120)) {
+							Multi_options_g.std_framecap = atoi(tok);
+						}
+					}
+				} else
+				// disable rollback for primary/dumbfire weapons
+				if ( SETTING("+rollback_disabled") ) {
+					Multi_options_g.std_rollback = false;
 				}
 			}
 

code/network/multi_options.h

@@ -50,6 +50,7 @@ typedef struct multi_global_options {
 	char		std_passwd[STD_PASSWD_LEN+1];							// standalone host password
 	char		std_pname[STD_NAME_LEN+1];								// permanent name for the standalone - if any
 	int		std_framecap;												// standalone frame cap
+	bool	std_rollback;												// use rollback for primary/dumbfire shots
 
 	ushort		webapiPort;
 	SCP_string	webapiUsername;
@@ -79,6 +80,7 @@ typedef struct multi_global_options {
 		memset(std_passwd, 0, STD_PASSWD_LEN+1);
 		memset(std_pname, 0, STD_NAME_LEN+1);
 		std_framecap = 30;
+		std_rollback = true;
 
 		webapiPort = 8080;
 		webapiUsername = "admin";

code/network/multimsgs.cpp

@@ -7931,7 +7931,7 @@ void process_non_homing_fired_packet(ubyte* data, header* hinfo)
 
 	object* objp_ref = multi_get_network_object(target_ref);
 
-	if (objp_ref == nullptr || objp_ref->type != OBJ_SHIP) {
+	if ((Is_standalone && !Multi_options_g.std_rollback) || !objp_ref || (objp_ref->type != OBJ_SHIP)) {
 		// new way failed, use the old new way.
 
 		if (objp_ref != nullptr){