add GetTextureDiagnostics (not used yet)

stepmania/src/RageDisplay.h

@@ -178,6 +178,8 @@ public:
 
 	virtual void SaveScreenshot( CString sPath ) = 0;
 
+	virtual CString GetTextureDiagnostics( unsigned id ) const { return ""; }
+
 protected:
 	// Return true if mode change was successful.
 	// bNewDeviceOut is set true if a new device was created and textures

stepmania/src/RageDisplay_OGL.cpp

@@ -533,6 +533,10 @@ void RageDisplay_OGL::SaveScreenshot( CString sPath )
 	SDL_FreeSurface( temp );
 }
 
+CString RageDisplay_OGL::GetTextureDiagnostics( unsigned id ) const
+{
+	return "";
+}
 
 RageDisplay::VideoModeParams RageDisplay_OGL::GetVideoModeParams() const { return wind->GetVideoModeParams(); }
 
@@ -1047,4 +1051,4 @@ RageMatrix RageDisplay_OGL::GetOrthoMatrix( float l, float r, float b, float t,
 		0,            0,            -2/(zf-zn),   0,
 		-(r+l)/(r-l), -(t+b)/(t-b), -(zf+zn)/(zf-zn),  1 );
 	return m;
-}
+}

stepmania/src/RageDisplay_OGL.h

@@ -59,6 +59,8 @@ public:
 	void DrawIndexedTriangles( const RageVertex v[], int iNumVerts, const Uint16* pIndices, int iNumIndices );
 	void DrawLineStrip( const RageVertex v[], int iNumVerts, float LineWidth );
 
+	CString GetTextureDiagnostics( unsigned id ) const;
+
 	void SaveScreenshot( CString sPath );
 protected:
 	bool TryVideoMode( VideoModeParams params, bool &bNewDeviceOut );