pub type PFN_vkGetSemaphoreFdKHR = unsafe extern "system" fn(_device: Device, _get_fd_info: *const SemaphoreGetFdInfoKHR, _fd: *mut c_int) -> Result;
https://www.khronos.org/registry/vulkan/specs/latest/man/html/vkGetSemaphoreFdKHR.html