[Webkit-unassigned] [Bug 160491] [GTK] Bad performance in accelerated compositing mode with the modesetting intel driver and DRI3 enabled

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Aug 3 01:10:51 PDT 2016


--- Comment #3 from Carlos Garcia Campos <cgarcia at igalia.com> ---
(In reply to comment #2)
> I was tempted to r+ but it looks like this is an undesirable side effect, so
> I'd prefer not to rely on that. From the freedesktop bug:
> "Weird, not sure why that avoids the problem; maybe there's an off-by-one
> bug somewhere which causes the window to be incorrectly considered
> on-screen. I wouldn't recommend relying on that. Also, again I'm not sure
> that negative coordinates can never be visible."

Yes, but he also said that using WidthOfScreen is bad in any case, so if the patch fixes that and works as a workaround, we could land it in any case and then continue working a better solution, but with a workaround to make WebKitGTK+ usable again.

> Also
> "Assuming a window is really the only possibility, (why) can't it set the
> swap interval to 0 via one of the GLX extensions for this, to prevent
> SwapBuffers operations from getting throttled?"
> Can't we do this instead?

I guess, I'm not a graphics expert, and I don't even know if we really need to use a window or not. I'll take a look at the swap interval thing in any case.

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