i965: Program 2x MSAA sample positions.
There are only two sensible placements for 2x MSAA samples - and one is the mirror image of the other. I chose (0.25, 0.25) and (0.75, 0.75). Signed-off-by: Kenneth Graunke <email@example.com> Reviewed-by: Ian Romanick <firstname.lastname@example.org> Reviewed-by: Chris Forbes <email@example.com>
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