pub type PFN_vkLayerCreateDevice = unsafe extern "system" fn(instance: Instance, physical_device: PhysicalDevice, p_create_info: *const DeviceCreateInfo, p_allocator: *const AllocationCallbacks, p_device: *mut Device, pfn_layer_GIPA: Option<PFN_vkGetInstanceProcAddr>, p_pfn_next_GDPA: *mut PFN_vkGetDeviceProcAddr) -> Result;