vulkaninfo: Many device extensions not displayed because dependent instance extensions not enabled

[pdaniell-nv]

vulkaninfo is very useful for capturing what an implementation supports. However, because it doesn't enable all the instance extensions the implementation advertises it causes many device extensions to not be advertised.

There is the following in the Vulkan specification (https://docs.vulkan.org/spec/latest/chapters/extensions.html):

Any device extension that has an instance extension dependency that is not enabled by vkCreateInstance is considered to be unsupported, hence it must not be returned by vkEnumerateDeviceExtensionProperties for any VkPhysicalDevice child of the instance.

For example, when running vulkaninfo on our implementation the VK_EXT_device_address_binding_report device extension is hidden because vulkaninfo doesn't enable the dependent VK_EXT_debug_utils instance extension.

You can see that dependency in the vk.xml:

<extension name="VK_EXT_device_address_binding_report" number="355" type="device" depends="(VK_KHR_get_physical_device_properties2,VK_VERSION_1_1)+VK_EXT_debug_utils" author="EXT" contact="Ralph Potter gitlab:@r_potter" specialuse="debugging,devtools" supported="vulkan" ratified="vulkan">

For our implementation on Windows, this dependency issue hides:

• VK_EXT_device_address_binding_report requires VK_EXT_debug_utils
• VK_KHR_swapchain_maintenance1 requires VK_KHR_swapchain+VK_KHR_surface_maintenance1
• VK_NV_acquire_winrt_display requires VK_EXT_direct_mode_display
• VK_NV_external_memory, VK_NV_external_memory_win32 and VK_NV_win32_keyed_mutex require VK_NV_external_memory_capabilities

Note that the NVIDIA implementation only recently implemented the Vulkan specification rule pasted above.

[charles-lunarg]

Vulkaninfo used to always enable all instance extensions, but that caused problems as newer instance extensions would add requirements which weren't being met (since vulkaninfo would just blindly enable every layer).

#799
#802

This issue is a bit of a rock and a hard place. Don't enable all instance extensions, vulkaninfo is not reporting all device extensions. Enable all instance extensions, play fowl of instance extension requirements. Its not impossible to add the necessary checks for instance extensions, but its extra maintenance burden every header update (as we now need to check if new instance extensions were added, and if so, what extra requirements are present).

[pdaniell-nv]

Maybe while a more generic solution is investigated, can we at least add the following in the short term:

• VK_EXT_debug_utils
• VK_KHR_surface_maintenance1 - this one will require an additional change for VUID-vkGetPhysicalDeviceSurfaceCapabilities2KHR-pNext-07776
• VK_EXT_direct_mode_display
• VK_NV_external_memory_capabilities