https://bugs.freedesktop.org/show_bug.cgi?id=27841
Summary: GLX/EGL extension to mark backbuffer purgeable after
using glXCopySubBufferMESA
Product: Mesa
Version: git
Platform: Other
OS/Version: All
Status: NEW
Severity: enhancement
Priority: medium
Component: GLX
AssignedTo: mesa-dev@lists.freedesktop.org
ReportedBy: b...@o-hand.com
Unlike the semantics of glXSwapBuffers which doesn't usually have to preserve
the contents of the backbuffer, glXCopySubBuffer can be called multiple times
though so the driver isn't ever be able to free the backbuffer under memory
pressure.
We use glXCopySubBufferMESA in Clutter when updating a small region of a
ClutterStage and would like to be able to tell the driver when the backbuffer
contents can be discarded.
Clutter is used by the Mutter compositor and there may be multiple OpenGL
applications on hidden/non-active workspaces and it would be ideal for the
corresponding backbuffers for those applications to be freed if the system is
under memory pressure.
Something like glXDiscardBackbufferMESA() could be one possability.
Alternatively a swap buffers API that could take a list of rectangles to blit
and immediately mark the backbuffer as purgeable might help.
(Apologies if I'm missing something and there is already a suitable mechanism.)
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