code: func MapBufferRange(target uint32, offset int, length int, access uint32) unsafe.Pointer {
  	ret := C.glowMapBufferRange(gpMapBufferRange, (C.GLenum)(target), (C.GLintptr)(offset), (C.GLsizeiptr)(length), (C.GLbitfield)(access))
  	return (unsafe.Pointer)(ret)
  }
docs: // map all or part of a buffer object's data store into the client's address space