pub type PFN_vkCreateMetalSurfaceEXT = unsafe extern "system" fn(_instance: Instance, _create_info: *const MetalSurfaceCreateInfoEXT, _allocator: *const AllocationCallbacks, _surface: *mut SurfaceKHR) -> Result;pub type PFN_vkCreateMetalSurfaceEXT = unsafe extern "system" fn(_instance: Instance, _create_info: *const MetalSurfaceCreateInfoEXT, _allocator: *const AllocationCallbacks, _surface: *mut SurfaceKHR) -> Result;