pub type PFN_vkGetPhysicalDeviceXcbPresentationSupportKHR = unsafe extern "system" fn(_physical_device: PhysicalDevice, _queue_family_index: u32, _connection: *mut xcb_connection_t, _visual_id: xcb_visualid_t) -> Bool32;pub type PFN_vkGetPhysicalDeviceXcbPresentationSupportKHR = unsafe extern "system" fn(_physical_device: PhysicalDevice, _queue_family_index: u32, _connection: *mut xcb_connection_t, _visual_id: xcb_visualid_t) -> Bool32;