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672fab0b1b
Previously, Mesa followed the linkage rules outlined in the GLSL
1.20-1.40 specs, which (collectively) said that GLSL versions 1.10 and
1.20 could be linked together, but no other versions could be linked.
In GLSL 4.30, the linkage rules were relaxed so that any two desktop
GLSL versions can be linked together. This change was made because it
reflected the behaviour of nearly all existing implementations (see
Khronos bug 8463). Mesa was one of the few (perhaps the only)
exceptions to prohibit cross-linking of some GLSL versions.
Since the GLSL linkage rules were deliberately relaxed in order to
match the behaviour of existing implementations, it seems appropriate
to relax the rules in Mesa too (even though Mesa doesn't support GLSL
4.30 yet).
Note that linking ES and desktop shaders is still prohibited, as is
linking ES shaders having different GLSL versions.
Fixes piglit tests "shaders/version-mixing {interstage,intrastage}".
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
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