pub type PFN_vkGetDescriptorSetLayoutSizeEXT = unsafe extern "system" fn(_device: Device, _layout: DescriptorSetLayout, _layout_size_in_bytes: *mut DeviceSize);pub type PFN_vkGetDescriptorSetLayoutSizeEXT = unsafe extern "system" fn(_device: Device, _layout: DescriptorSetLayout, _layout_size_in_bytes: *mut DeviceSize);