to comply with ES2+ line clipping rules, guardband clipping should be
used so that the rasterizer will clip lines without using clip planes
fixes (llvmpipe):
dEQP-GLES*.functional.clipping.line.wide_line_clip_viewport_center
dEQP-GLES*.functional.clipping.line.wide_line_clip_viewport_corner
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17284>