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ngl: apply fewer uniforms

Christian Hergert requested to merge wip/chergert/fewer-uniforms into master

Two commits here:

  • First is relatively cheap check to avoid comparing when two uniforms are known to be the same
  • Second further compares uniforms (like early prototypes) to avoid changing state while building batches

Combined, they should reduce number of glUniform* calls.

Not really much of a performance difference though, trading some function calls into GL for some memcmp's.

It should make apitrace output less chatty though.

Tested on xorg/nvidia and macos without much difference, so im fine with it if we want lighter traces.

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