implement Transition::GetTweenTimeLeft

stepmania/src/Transition.cpp

@@ -105,3 +105,11 @@ float Transition::GetLengthSeconds() const
 {
 	return m_BGAnimation.GetLengthSeconds();
 }
+
+float Transition::GetTweenTimeLeft() const
+{
+	if( m_State != transitioning )
+		return 0;
+
+	return m_BGAnimation.GetTweenTimeLeft();
+}

stepmania/src/Transition.h

@@ -29,6 +29,7 @@ public:
 
 	virtual void StartTransitioning( ScreenMessage send_when_done = SM_None );
 	virtual bool EarlyAbortDraw();
+	virtual float GetTweenTimeLeft() const;
 
 	bool IsTransitioning() const	{ return m_State == transitioning; };
 	bool IsFinished() const	{ return m_State == finished; };