virtual void addRenderable( const OpenGLRenderable& renderable, const Matrix4& modelview, const LightList* lights = 0 ) = 0;
virtual void incrementUsed() = 0;
virtual void decrementUsed() = 0;
virtual void addRenderable( const OpenGLRenderable& renderable, const Matrix4& modelview, const LightList* lights = 0 ) = 0;
virtual void incrementUsed() = 0;
virtual void decrementUsed() = 0;