Add support for toggling windowed mode other than alt-enter. E.g. from a menu item.

stepmania/src/StepMania.cpp

@@ -1348,17 +1348,13 @@ bool HandleGlobalInputs( const InputEventPlus &input )
 		StepMania::SaveScreenshot( "Screenshots/", bSaveCompressed, false );
 		return true;	// handled
 	}
-
-	if( input.DeviceI == DeviceInput(DEVICE_KEYBOARD, KEY_ENTER) )
+	
+	if( input.DeviceI == DeviceInput(DEVICE_KEYBOARD, KEY_ENTER) &&
+		(INPUTFILTER->IsBeingPressed(DeviceInput(DEVICE_KEYBOARD, KEY_RALT)) ||
+		 INPUTFILTER->IsBeingPressed(DeviceInput(DEVICE_KEYBOARD, KEY_LALT))) )
 	{
-		if( INPUTFILTER->IsBeingPressed(DeviceInput(DEVICE_KEYBOARD, KEY_RALT)) ||
-			INPUTFILTER->IsBeingPressed(DeviceInput(DEVICE_KEYBOARD, KEY_LALT)) )
-		{
-			/* alt-enter */
-			PREFSMAN->m_bWindowed.Set( !PREFSMAN->m_bWindowed );
-			StepMania::ApplyGraphicOptions();
-			return true;
-		}
+		/* alt-enter */
+		ArchHooks::SetToggleWindowed();
 	}
 
 	return false;
@@ -1446,6 +1442,12 @@ void HandleInputEvents(float fDeltaTime)
 
 		SCREENMAN->Input( input );
 	}
+	
+	if( ArchHooks::GetAndClearToggleWindowed() )
+	{
+		PREFSMAN->m_bWindowed.Set( !PREFSMAN->m_bWindowed );
+		StepMania::ApplyGraphicOptions();
+	}	
 }
 
 void StepMania::FocusChanged( bool bHasFocus )

stepmania/src/arch/ArchHooks/ArchHooks.cpp

@@ -1,9 +1,28 @@
 #include "global.h"
 #include "ArchHooks.h"
+#include "RageThreads.h"
 
 bool ArchHooks::s_bQuitting = false;
+bool ArchHooks::s_bToggleWindowed = false;
+// Keep from pulling RageThreads.h into ArchHooks.h
+static RageMutex s_AHLock( "ArchHooks lock" );
 ArchHooks *HOOKS = NULL;
 
+bool ArchHooks::GetAndClearToggleWindowed()
+{
+	LockMut( s_AHLock );
+	bool bToggle = s_bToggleWindowed;
+	
+	s_bToggleWindowed = false;
+	return bToggle;
+}
+
+void ArchHooks::SetToggleWindowed()
+{
+	LockMut( s_AHLock );
+	s_bToggleWindowed = true;
+}
+
 #include "Selector_ArchHooks.h"
 ArchHooks *MakeArchHooks()
 {

stepmania/src/arch/ArchHooks/ArchHooks.h

@@ -4,6 +4,7 @@
 class ArchHooks
 {
 	static bool s_bQuitting;
+	static bool s_bToggleWindowed;
 public:
 	virtual ~ArchHooks() { }
 
@@ -50,6 +51,13 @@ public:
 	 */
 	static bool UserQuit() { return s_bQuitting; }
 	static void SetUserQuit() { s_bQuitting = true; }
+	
+	/*
+	 * Returns true if the user wants to toggle windowed mode and atomically clears
+	 * the boolean.
+	 */
+	static bool GetAndClearToggleWindowed();
+	static void SetToggleWindowed();
 
 	/*
 	 * Return the amount of time since the program started.  (This may actually be