pub type PFN_vkCreateXcbSurfaceKHR = unsafe extern "system" fn(instance: Instance, p_create_info: *const XcbSurfaceCreateInfoKHR, p_allocator: *const AllocationCallbacks, p_surface: *mut SurfaceKHR) -> Result;
pub type PFN_vkCreateXcbSurfaceKHR = unsafe extern "system" fn(instance: Instance, p_create_info: *const XcbSurfaceCreateInfoKHR, p_allocator: *const AllocationCallbacks, p_surface: *mut SurfaceKHR) -> Result;