code: func FramebufferRenderbuffer(target uint32, attachment uint32, renderbuffertarget uint32, renderbuffer uint32) {
  	syscall.Syscall6(gpFramebufferRenderbuffer, 4, uintptr(target), uintptr(attachment), uintptr(renderbuffertarget), uintptr(renderbuffer), 0, 0)
  }
docs: // attach a renderbuffer as a logical buffer of a framebuffer object