• Adam Jackson's avatar
    glamor_egl: Don't initialize on llvmpipe · 0a9415cf
    Adam Jackson authored and Adam Jackson's avatar Adam Jackson committed
    Mesa started supporting GL_OES_EGL_image on llvmpipe in 17.3, after this
        commit bbdeddd5fd0b797e1e281f058338b3da4d98029d
        Author: Gurchetan Singh <gurchetansingh@chromium.org>
        Date:   Tue Aug 1 14:49:33 2017 -0700
            st/dri: add drisw image extension
    That's pretty cool, but it means glamor now thinks it can initialize on
    llvmpipe. This is almost certainly not what anyone wants, as glamor on
    llvmpipe is pretty much uniformly slower than fb.
    This fixes both Xorg and Xwayland to refuse glamor in such a setup.
    Xephyr is left alone, both because glamor is not the default there and
    because Xephyr+glamor+llvmpipe is one of the easier ways to get xts to
    exercise glamor.
    The (very small) downside of this change is that you lose DRI3 support.
    This wouldn't have helped you very much (since an lp glamor blit is
    slower than a pixman blit), but it would eliminate the PutImage overhead
    for llvmpipe's glXSwapBuffers. A future change should add DRI3 support
    for the fb-only case.
    Reviewed-by: Emma Anholt's avatarEric Anholt <eric@anholt.net>
    Signed-off-by: Adam Jackson's avatarAdam Jackson <ajax@redhat.com>