[Mesa-dev] [Bug 111259] Presentation regression while rendering on X11 surface

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111259

--- Comment #3 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
(In reply to jaelpark from comment #2)
> I was looking if there would be some minimal test case to demonstrate this,
> but couldn't find one so far. One case where this gets reproduced is the
> desktop compositor I've been working on. The build instructions and setup is
> here:
> https://jaelpark.github.io/chamferwm-docs/setup.html#building-with-meson
> 
> After building, change the terminal emulator in line 504 of config/config.py
> to your preference, and once running, launch the terminal with Alt+Enter.
> Typing something will reveal how the frames come disordered and lagging.
> Using a recent version of mesa before this particular commit will result in
> expected behavior.

I think I can spot the bug in your compositor :

compositor.cpp:984 : currentFrame = (currentFrame+1)%swapChainImageCount;

That's incorrect, the image indice returned by acquireNextImage() might not
increment.

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