[PATCH 1/3] vulkan: Define new VK_MESA_query_timestamp extension [v2]

[Keith Packard]

Pekka Paalanen <ppaalanen at gmail.com> writes:

> I did not mean you would be solving that problem. I meant that it would
> be good to figure out what people actually want from the API to be able
> to solve the problem themselves.

Thanks for the clarification. I'd suggest that we not try and solve that
problem until we have someone who needs it?

What I'm using this extension for is to correlate GPU times with WSI
times as required by the GOOGLE_display_timing extension. That extension
reports the time gap between the end of rendering and when a frame is
displayed as reported by the WSI backend, so I needed some way to
translate between those two time domains. To do this, I call this new
function once per presentation, which means I'm getting recent values
for both clocks which should track any minor clock skew.

-- 
-keith
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