Knuth, predicting "a monad is a monoid in the category of endofunctors":pic.twitter.com/yGL0Iul2DQ
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Purity ends there, meaningfully. You'd still upload data to the GPU, and the most toplevel part of your rendering code needs live in the IO monad.
Ends where exactly? Texture maps are 1 of many things I can name without even pausing to think about it.
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