ggml_vulkan extension questions

[yserrr]

I’m new to Vulkan and I had a small question while running with validation layers enabled.

I noticed that Vulkan validation prints warnings about enabling extensions like
VK_KHR_shader_float16_int8 / VK_KHR_16bit_storage,
mentioning that they have already been promoted to core (Vulkan 1.2 / 1.1).

Validation Warning: [ BestPractices-deprecated-extension ] | MessageID = 0xda8260ba
vkCreateDevice(): Attempting to enable deprecated extension VK_KHR_16bit_storage, but this extension has been promoted t
o 1.1.0 (0x00401000).
Objects: 1
[0] VkInstance 0x28d88f8cca0

Validation Warning: [ BestPractices-deprecated-extension ] | MessageID = 0xda8260ba
vkCreateDevice(): Attempting to enable deprecated extension VK_KHR_shader_float16_int8, but this extension has been prom
oted to 1.2.0 (0x00402000).
Objects: 1
[0] VkInstance 0x28d88f8cca0

Since the project seems to require Vulkan 1.2+ anyway,
I was wondering if there is a specific reason these KHR extensions are still explicitly enabled.
Is it for backward compatibility, driver quirks, or just leftover code that hasn’t been cleaned up yet.

Sorry if this is a basic question
just trying to understand the design choices better.
Thanks!

[jeffbolznv]

It's probably not necessary to enable these extensions that have been promoted to core. However, the Vulkan features from these extensions (storageBuffer16BitAccess, shaderFloat16) are not required to be supported in a Vulkan 1.2 implementation, so we still need to check for their support and enable them.