public virtual void BindRenderbuffer(uint target, WebGLRenderbuffer renderbuffer)
 {
 }
 public virtual void FramebufferRenderbuffer(uint target, uint attachment, uint renderbuffertarget, WebGLRenderbuffer renderbuffer)
 {
 }
 public virtual bool IsRenderbuffer(WebGLRenderbuffer renderbuffer)
 {
     return(false);
 }
 public virtual void DeleteRenderbuffer(WebGLRenderbuffer renderbuffer)
 {
 }