pub type PFN_vkDestroyOpticalFlowSessionNV = unsafe extern "system" fn(_device: Device, _session: OpticalFlowSessionNV, _allocator: *const AllocationCallbacks);pub type PFN_vkDestroyOpticalFlowSessionNV = unsafe extern "system" fn(_device: Device, _session: OpticalFlowSessionNV, _allocator: *const AllocationCallbacks);