[Bug 92970] Feature request: Implement __DRIimageExtension's blitImage

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92970

            Bug ID: 92970
           Summary: Feature request: Implement __DRIimageExtension's
                    blitImage
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: axel.davy at ens.fr
        QA Contact: intel-3d-bugs at lists.freedesktop.org

blitImage is part of __DRIimageExtension Mesa internal API.

It is used to blit from a surface to another (I don't expect it would be
difficult to implement for an intel dev).

The extension is required for the secondary card for DRI_PRIME on egl/wayland,
glx dri3 (and soon egl/x11 dri3).

While if you are on a dedicated card it doesn't make a lot of sense to use
DRI_PRIME to render on the integrated gpu (thus explaining the current low
interest to implement the function), we could imagine it be used by future
wayland compositors when enabling the use of several displays connected to
different cards (one of the big things wayland is supposed to solve).

As Wayland compositors begin to be more and more ready, I suggest to implement
that function soon, so that when wayland compositors become ready enough to
begin to implement advanced functionnalities, blitImage would be ready for
intel as well for Mesa stable.

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