vrend: Cleanup and fix bug in next_sampler_id tracking
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First 5 commits are pure refactor to improve readability/maintainability in
bind_*_locs()
functions. -
Commit 6 fixes #227 (closed) which regressed rendering correctness for Factorio in c08c8419.
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Last commit silences an annoying and useless message when the guest indicates that no sampling parameter updates need to occur for a given texture unit.
Edited by Ryan Neph