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HLSL: add standard sample position return form of GetSamplePosition m…
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…ethod

Multisample textures support a GetSamplePosition() method intended to query
positions given a sample index.  This cannot be truly implemented in SPIR-V,
but #753 requested returning standard positions for the 1..16 cases, which
this PR adds.  Anything besides that returns (0,0).  If the standard positions
are not used, this will be wrong.

This should be revisited when there is a real query available.
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steve-lunarg committed Apr 26, 2017
1 parent a1cdd13 commit d4d0b29
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