[Mesa-dev] [Bug 111590] Please add an option to override number of backuffers in radv with environment variable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111590

            Bug ID: 111590
           Summary: Please add an option to override number of backuffers
                    in radv with environment variable
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: enhancement
          Priority: not set
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: shtetldik at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

There are cases when too few backuffers can cause Wayland compositors to lock
framerate to refresh rate of the monitor (for example in XWayland case), no
matter if vsync is on or off in the application settings.

See: https://gitlab.freedesktop.org/xorg/xserver/issues/20

While in case of dxvk, there is an option to increase number of backuffers to
mitigate that, when dealing with some native or even Wine based Vulkan
applications, there might be no easy way to do it. Adding an option to radv,
similar how it now allows overriding present mode with MESA_VK_WSI_PRESENT_MODE
can help such cases.

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