[Haskell-cafe] OpenGL performance issue on OSX

[Michael Baker]

I've added a VAO and reduced the inner loop to only a call to glDrawArrays
which renders 8000 triangles (24000 vertices). The gameFrame function now
benchmarks at ~86ms on my machine. I would expect it to be ~16ms because of
vsync. I've pared down the entire project into this buildable cabal project
of three files, most of which is OpenGL boilerplate:
https://github.com/MichaelBaker/haskell-opengl. Running it benchmarks the
problem area. For what it's worth, I also tried using glBufferSubData to
update the vertex data, but that had no effect.

As a side note, vinyl-gl looks like a nice library. I'll definitely look
into using it if I can ever get this basic example working.
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