Vulkan WSI+VK_KHR_display for KMS/DRM?

[Jason Ekstrand]

On April 10, 2017 12:29:12 PM Chad Versace <chadversary at chromium.org> wrote:

> On Tue 04 Apr 2017, Keith Packard wrote:
>> Jason Ekstrand <jason at jlekstrand.net> writes:
>>
>> > Interesting question.  To my knowledge, no one has actually implemented the
>> > Vulkan WSI direct-to-display extensions.  (I tried to prevent them from
>> > getting released with 1.0 but failed.)  I believe the correct answer is to
>> > use the external memory dma-buf stuff that chad and I have been using and
>> > talk directly to KMS.
>>
>> Sounds good, and minimizes the amount of code I have to write too :-)
>
> I found an implementation. Nvidia's 2017-04-06 Linux driver release
> notes claim newly added support for VK_EXT_direct_mode_diplay, which is
> layered atop VK_KHR_display.

If it's useful to do so, we can always pull Keith's work into Mesa or even 
put it in a layer.  Let's start with an implementation and figure out the 
Vulkan bits later.  Of there's something interesting in NVIDIA's 
extensions, we can let that guide the design of course.

> http://www.nvidia.com/download/driverResults.aspx/117741/en-us
> https://www.khronos.org/registry/vulkan/specs/1.0-extensions/html/vkspec.html#VK_EXT_direct_mode_display
>
>> > I see no good reason to have a large abstraction in
>> > the middle.
>>
>> Other than 'it's a standard', neither do I.
>
> Yup.