code: func GetObjectPtrLabel(ptr unsafe.Pointer, bufSize int32, length *int32, label *uint8) {
  	C.glowGetObjectPtrLabel(gpGetObjectPtrLabel, ptr, (C.GLsizei)(bufSize), (*C.GLsizei)(unsafe.Pointer(length)), (*C.GLchar)(unsafe.Pointer(label)))
  }
docs: // retrieve the label of a sync object identified by a pointer