multi:: split-screen mode is now an option

basegraph.cpp

@@ -1497,6 +1497,7 @@ EX int calcfps() {
 EX namespace subscreens {
 
   EX vector<display_data> player_displays;
+  /** 'in' is on if we are currently working on a single display */
   EX bool in;
   EX int current_player;
   
@@ -1528,7 +1529,7 @@ EX namespace subscreens {
   EX bool split(reaction_t what) {
     using namespace racing;
     if(in) return false;
-    if(!racing::on && !(shmup::on && GDIM == 3)) return false;
+    if(!multi::split_screen) return false;
     if(!player_displays.empty()) {
       in = true;
       int& p = current_player;

multi.cpp

@@ -28,6 +28,8 @@ EX namespace multi {
   EX config scfg;  
   EX charstyle scs[MAXPLAYER];
 
+  EX bool split_screen;
+
   EX int players = 1;
   EX cellwalker player[MAXPLAYER];
   EX vector<int> revive_queue; // queue for revival
@@ -519,6 +521,7 @@ EX void showConfigureMultiplayer() {
 
     dialog::addSelItem(XLAT("keyboard & joysticks"), "", 'k');
     dialog::add_action(multi::configure);
+    add_edit(split_screen);
     }
   else dialog::addBreak(200);
   
@@ -690,6 +693,8 @@ EX void initConfig() {
   
   #if CAP_CONFIG
   addsaver(multi::players, "mode-number of players");
+  param_b(multi::split_screen, "splitscreen", false)
+    ->editable("split screen mode", 's');
   addsaver(alwaysuse, "use configured keys");  
   // unfortunately we cannot use key names here because SDL is not yet initialized
   for(int i=0; i<512; i++)