Validation error on device extension on M1 mac

Question

So I am attempting to follow the Vulkan tutorial on a mac with an M1 processor, and I am running into an issue with device creation.

So as per the tutorial I am setting the device enabled extensions like so:

const std::vector<const char*> deviceExtensions = {
    VK_KHR_SWAPCHAIN_EXTENSION_NAME,
};

VkDeviceCreateInfo createInfo = {};
createInfo.enabledExtensionCount = static_cast<uint32_t>(deviceExtensions.size());
createInfo.ppEnabledExtensionNames = deviceExtensions.data();

When I run this, I get the following validation errors:

validation layer: Validation Error: [ VUID-VkDeviceCreateInfo-pProperties-04451 ] Object 0: handle = 0x11bd84d40, type = VK_OBJECT_TYPE_PHYSICAL_DEVICE; | MessageID = 0x3a3b6ca0 | vkCreateDevice: VK_KHR_portability_subset must be enabled because physical device VkPhysicalDevice 0x11bd84d40[] supports it The Vulkan spec states: If the VK_KHR_portability_subset extension is included in pProperties of vkEnumerateDeviceExtensionProperties, ppEnabledExtensionNames must include "VK_KHR_portability_subset" (https://vulkan.lunarg.com/doc/view/1.3.211.0/mac/1.3-extensions/vkspec.html#VUID-VkDeviceCreateInfo-pProperties-04451)

validation layer: vkCreateDevice: Attempting to create a VkDevice from a VkPhysicalDevice which is from a portability driver without the VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR bit in the VkInstanceCreateInfo flags being set and the VK_KHR_portability_enumeration extension enabled. In future versions of the loader this VkPhysicalDevice will not be enumerated.

So I have tried adding the VK_KHR_portability_subset extension mentioned in the first error:

const std::vector<const char*> deviceExtensions = {
    VK_KHR_SWAPCHAIN_EXTENSION_NAME,
    "VK_KHR_portability_subset",
};

And then I get the following validation errors:

validation layer: Validation Error: [ VUID-vkCreateDevice-ppEnabledExtensionNames-01387 ] Object 0: handle = 0x106849800, type = VK_OBJECT_TYPE_INSTANCE; | MessageID = 0x12537a2c | Missing extension required by the device extension VK_KHR_portability_subset: VK_KHR_get_physical_device_properties2. The Vulkan spec states: All required device extensions for each extension in the VkDeviceCreateInfo::ppEnabledExtensionNames list must also be present in that list (https://vulkan.lunarg.com/doc/view/1.3.211.0/mac/1.3-extensions/vkspec.html#VUID-vkCreateDevice-ppEnabledExtensionNames-01387)

validation layer: vkCreateDevice: Attempting to create a VkDevice from a VkPhysicalDevice which is from a portability driver without the VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR bit in the VkInstanceCreateInfo flags being set and the VK_KHR_portability_enumeration extension enabled. In future versions of the loader this VkPhysicalDevice will not be enumerated.

validation layer: vkGetPhysicalDeviceProperties2KHR: Emulation found unrecognized structure type in pProperties->pNext - this struct will be ignored

So it looks like it's missing the VK_KHR_get_physical_device_properties2 and I tried adding that as well:

const std::vector<const char*> deviceExtensions = {
    VK_KHR_SWAPCHAIN_EXTENSION_NAME,
    "VK_KHR_portability_subset",
    "VK_KHR_get_physical_device_properties2"
};

And after adding this, device creation actually fails with this error:

validation layer: loader_validate_device_extensions: Device extension VK_KHR_get_physical_device_properties2 not supported by selected physical device or enabled layers.

So it seems like it's impossible to satisfy the validation layers. What's the correct way to initialize a logical device on an M1 mac?

Answer 1

It does work for me, but ...

you have to add VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME in VkInstanceCreateInfo.ppEnabledExtensionNames when creating the Vulkan instance first (the vkCreateInstance call), before creating the device, together with whatever other extensions you are using:

VkInstanceCreateInfo createInfo{};

...

const std::vector<const char*> exts =
{
    ...
    VK_KHR_SURFACE_EXTENSION_NAME,
    VK_EXT_METAL_SURFACE_EXTENSION_NAME,
    VK_MVK_MACOS_SURFACE_EXTENSION_NAME,    
    VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME, // <--
    ...
};

ppEnabledExtensionNames = exts.data();

...

and also add the flag bit that validation layer also tells you about:

createInfo.flags = VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;

Create the instance and then DON'T include VK_KHR_get_physical_device_properties2, but add VK_KHR_PORTABILITY_SUBSET_EXTENSION_NAME when you create the device and you are done.

All this seems to be needed starting with 1.3.216.0 Vulkan SDK.

Answer 2

The key observation is that the error message (likely autogenerated) is wrong. VK_KHR_get_physical_device_properties2 is an instance extension and not a device extension. Thus the solution is to define VK_KHR_get_physical_device_properties2 and VK_KHR_portability_enumeration in your instance extensions and define VK_KHR_portability_subset in your device extensions. Doing this, I was able to make the error message go away.