dual:: selectable from the menu

achievement.cpp

@@ -90,6 +90,7 @@ bool wrongMode(char flags) {
 
   if(shmup::on != (flags == rg::shmup || flags == rg::racing)) return true;
   if(racing::on != (flags == rg::racing)) return true;
+  if((!!dual::state) != (flags == rg::dualmode)) return true;
 #if CAP_DAILY
   if(daily::on != (flags == rg::daily)) return true;
 #endif
@@ -526,6 +527,7 @@ void achievement_score(int cat, int number) {
   else if(geometry) return;
   if(CHANGED_VARIATION) return;
   if(randomPatternsMode) return;
+  if(dual::state) return;
   if(shmup::on && cat != LB_PURE_TACTICS_SHMUP && cat != LB_PURE_TACTICS_COOP && cat != LB_RACING) return;
   if(yendor::on && cat != LB_YENDOR_CHALLENGE) return;
   if(tactic::on && cat != LB_PURE_TACTICS && cat != LB_PURE_TACTICS_SHMUP && cat != LB_PURE_TACTICS_COOP) 
@@ -615,6 +617,7 @@ void achievement_final(bool really_final) {
   if(randomPatternsMode) return;
   if(peace::on) return;
   if(yendor::on) return;
+  if(dual::state) return;
 
   if(tactic::on) {
     tactic::record();

hyper.h

@@ -752,6 +752,7 @@ namespace rg {
   static const char daily = 'd';
   static const char daily_off = 'D';
   static const char racing = 'R';
+  static const char dualmode = 'U';
   
   // wrongmode only -- marks 'global' achievements not related to the current mode
   static const char global = 'x'; 
@@ -5462,6 +5463,9 @@ namespace dual {
   
   bool check_side(eLand l);
   void assign_landsides();
+  
+  void disable();
+  void enable();
   }
 
 }

menus.cpp

@@ -515,6 +515,10 @@ void showChangeMode() {
 #if CAP_RACING
   dialog::addBoolItem(XLAT("racing mode"), racing::on, 'R');
 #endif
+#if CAP_ARCM
+  dialog::addBoolItem(XLAT("dual geometry mode"), dual::state, 'D');
+  dialog::add_action([] { dialog::do_if_confirmed([] { restart_game(rg::dualmode); }); });
+#endif
 #if CAP_DAILY
   dialog::addBoolItem(XLAT("Strange Challenge"), daily::on, 'z');
 #endif

system.cpp

@@ -1166,6 +1166,13 @@ void set_variation(eVariation target) {
     variation = target;
     }
   }
+  
+void stop_tour() {
+  while(gamestack::pushed()) {
+    gamestack::pop();
+    stop_game();
+    }
+  }
 
 void switch_game_mode(char switchWhat) {
   DEBBI(DF_INIT, ("switch_game_mode ", switchWhat));
@@ -1177,6 +1184,14 @@ void switch_game_mode(char switchWhat) {
       racing::on = false;
       break;
     
+    case rg::dualmode:
+      stop_tour(); tour::on = false;
+      racing::on = false;
+      yendor::on = tactic::on = princess::challenge = false;
+      if(!dual::state) dual::enable();
+      else dual::disable();
+      break;
+    
     case rg::inv:
       inv::on = !inv::on;
       if(tactic::on) firstland = laIce;
@@ -1195,12 +1210,10 @@ void switch_game_mode(char switchWhat) {
 
 #if CAP_TOUR
     case rg::tour:
-      while(gamestack::pushed()) {
-        gamestack::pop();
-        stop_game();
-        }
+      if(tour::on) stop_tour();
       geometry = gNormal;
       yendor::on = tactic::on = princess::challenge = peace::on = inv::on = false;
+      dual::disable();
       chaosmode = randomPatternsMode = false;
       variation = eVariation::bitruncated;
       #if CAP_GP
@@ -1222,6 +1235,7 @@ void switch_game_mode(char switchWhat) {
       chaosmode = false;
       racing::on = false;
       if(!yendor::on) firstland = laIce;
+      dual::disable();
       break;
 
 #if CAP_RACING    
@@ -1234,6 +1248,7 @@ void switch_game_mode(char switchWhat) {
       chaosmode = false;
       princess::challenge = false;
       if(bounded) set_geometry(gNormal);
+      dual::disable();
       break;
 #endif
 
@@ -1247,6 +1262,7 @@ void switch_game_mode(char switchWhat) {
       racing::on = false;
       chaosmode = false;
       if(!tactic::on) firstland = laIce;
+      dual::disable();
       break;
     
     case rg::shmup:
@@ -1273,6 +1289,7 @@ void switch_game_mode(char switchWhat) {
       chaosmode = false;
       inv::on = false;
       racing::on = false;
+      dual::disable();
       break;
     
 #if CAP_DAILY