pub type PFN_vkCreateDescriptorPool = unsafe extern "system" fn(Device, *const DescriptorPoolCreateInfo, *const AllocationCallbacks, *mut DescriptorPool) -> Result;pub type PFN_vkCreateDescriptorPool = unsafe extern "system" fn(Device, *const DescriptorPoolCreateInfo, *const AllocationCallbacks, *mut DescriptorPool) -> Result;