add GetMonitorAspectRatio

stepmania/src/arch/LowLevelWindow/LowLevelWindow.h

@@ -18,6 +18,7 @@ public:
 	// need to be reloaded.
 	virtual RString TryVideoMode( const VideoModeParams &p, bool &bNewDeviceOut ) = 0;
 	virtual void GetDisplayResolutions( DisplayResolutions &out ) const = 0;
+	virtual float GetMonitorAspectRatio() const = 0;
 
 	virtual bool IsSoftwareRenderer( RString &sError ) { return false; }
 

stepmania/src/arch/LowLevelWindow/LowLevelWindow_Win32.cpp

@@ -59,6 +59,11 @@ void LowLevelWindow_Win32::GetDisplayResolutions( DisplayResolutions &out ) cons
 	GraphicsWindow::GetDisplayResolutions( out );
 }
 
+float LowLevelWindow_Win32::GetMonitorAspectRatio() const
+{
+	return GraphicsWindow::GetMonitorAspectRatio();
+}
+
 int ChooseWindowPixelFormat( const VideoModeParams &p, PIXELFORMATDESCRIPTOR *PixelFormat )
 {
 	ASSERT( GraphicsWindow::GetHwnd() != NULL );

stepmania/src/arch/LowLevelWindow/LowLevelWindow_Win32.h

@@ -11,6 +11,7 @@ public:
 	void *GetProcAddress( RString s );
 	RString TryVideoMode( const VideoModeParams &p, bool &bNewDeviceOut );
 	void GetDisplayResolutions( DisplayResolutions &out ) const;
+	float GetMonitorAspectRatio() const;
 	bool IsSoftwareRenderer( RString &sError );
 	void SwapBuffers();
 	void Update();