Test aniso filter#3159

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kdashg wants to merge 2 commits intoKhronosGroup:mainfrom

kdashg:test-aniso-filter

Commits on Oct 5, 2020

Add test for TEXTURE_MIN/MAG_FILTER and TEXTURE_MAX_ANISOTROPY.
kdashg
committed

Commits on Oct 7, 2020

Draw a quad instead of point for more predicable derivatives.
kdashg
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