15:42 <tortoise> I saw this in the Mesa 24.1.0 release notes. "panvk: Kill panvk_{Create,Destroy}SamplerYcbcrConversion()"

15:42 <tortoise> What does this note mean exactly by Kill? I'm trying to learn a bit about how a driver implements vulkan extensions and I'm still quite new and lost.

15:42 <tortoise> Is the hardware capable of doing this but for now Mesa is killing the effort to support it in the driver for now?

16:03 <robmur01> tortoise: AFAICS from that commit, it just removed some dummy function implementations which did nothing, where the common code was already capable of doing nothing by default

16:07 <robmur01> (or maybe the default implementation does even more than nothing, I'm not familiar with the details)

16:21 <tortoise> I read a blog post that stats "The act of converting YUV to RGB is very simple as it’s just a color space transform with a 3×3 matrix, but YUV means many things. " Which leads me to believe that pretty much any GPU would be able to support SamplerYcbcrConversion extension if implemented in the vulkan driver? Is that basically correct?

16:32 <yusisamerican-tmp98123821> Uhhh theres a lot of other things around the whole driver that need to be plumbed for YCBCR IIRC

16:38 <yusisamerican-tmp98123821> tortoise: If there is no hardware support, you need to plumb the sampler, and I think (?) requires multiple sampler planes for VK_CONVERSION_SEPARATE_RECONSTRUCTION_FILTER_BIT.

16:39 <yusisamerican-tmp98123821> For this you can see Mohammad's blog about getting YCBCR to work on NVK: https://mohamexiety.github.io/posts/hello_world/

16:45 <tortoise> cool thank you, I'm going to read all of the posts from that series