swr: rework vert <-> frag shader linkage logic

Fixes a few things:
 - sprite coords only apply to generic varyings, and are a bitmask
 - back color only applies in 2-sided lighting mode
 - handle some odd situations between only some front/back colors being
   there. This is only semi-legal in GL, but we shouldn't start
   crashing.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Tim Rowley <[email protected]>

0 files changed, 0 insertions, 0 deletions