pub type GetInstanceProcAddrSignature = unsafe extern "system" fn(Option<BorrowedHandle<'_, Instance>>, *const c_char) -> *const ();Expand description
https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/PFN_vkGetInstanceProcAddr.html
Entry point of the vulkan library, this is used to retrieve Vulkan functions
This function can be retrieved by loading the library using Dispatcher::new_loaded, using your own library
loading code or some external libraries provide it like SDL with SDL_Vulkan_GetVkGetInstanceProcAddr