Instance-level functions are used mainly for operations on physical devices. There are multiple instance-level functions, with vkEnumeratePhysicalDevices(), vkGetPhysicalDeviceProperties(), vkGetPhysicalDeviceFeatures(), vkGetPhysicalDeviceQueueFamilyProperties(), vkCreateDevice(), vkGetDeviceProcAddr(), vkDestroyInstance() or vkEnumerateDeviceExtensionProperties() among them. However, this list doesn't include all instance-level functions.
How can we tell if a function is instance- or device-level? All device-level functions have their first parameter of type VkDevice, VkQueue, or VkCommandBuffer. So, if a function doesn't have such a parameter and is not from the global level, it is from an instance level. As mentioned previously, ...
