pub type PFN_vkGetDeviceBufferMemoryRequirements = unsafe extern "system" fn(Device, *const DeviceBufferMemoryRequirements, *mut MemoryRequirements2);pub type PFN_vkGetDeviceBufferMemoryRequirements = unsafe extern "system" fn(Device, *const DeviceBufferMemoryRequirements, *mut MemoryRequirements2);