virtual void PushState() = 0;
virtual void PopState() = 0;
virtual void SetState( Shader* state, EStyle mode ) = 0;
-virtual const EStyle getStyle() const = 0;
+virtual EStyle getStyle() const = 0;
virtual void Highlight( EHighlightMode mode, bool bEnable = true ) = 0;
virtual void setLights( const LightList& lights ){
}