Fixes incorrect values in "Passing Shader Uniforms" example#1022

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JetStarBlues wants to merge 4 commits intoprocessing:mainfrom

JetStarBlues:resolvesIssue1021

Commits on Apr 22, 2021

Fixes incorrect values in example. See issue #1021.
JetStarBlues
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Commits on Apr 28, 2021

Use resolution independent calculations.
JetStarBlues
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Commits on May 20, 2021