mesa: Enable GL_MESA_pack_invert unconditionally
This newly enables the extension for r100 and vieux. As far as I can
tell, that's safe to do. vieux's ReadPixels is just _mesa_readpixels,
which clearly already handles it correctly because the extension is
enabled for classic swrast. r100 has some custom acceleration paths
before falling down to _mesa_readpixels, which winds its way through to
r100_blit, which already has code to handle pack->Invert being set.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3156>
8 files changed
