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The difference between a uniform arrangement and a single index?

What is the difference between uniform distribution and a single index in OpenGL? It looks like you need the location to assign a uniformity value, and you need an index to request uniform information.

Why is there a need for two meanings? Why can't one of them fulfill both of these goals?

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It seems you need the location to assign a uniformity value, and you need an index to request uniform information.

Yes, that’s the difference between the two.

Why is there a need for two meanings?

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