since 1.0 is used in nearly every case, drivers requiring this exporting
can avoid potential shader variants by adding a 1.0 export to the base
shader variant and the only using the ubo upload when pointsize is explicitly
set for wide point functionality
drivers can then be responsible for removing unused pointsize exports
as needed (or desired)
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15699>
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