Switch from subsurface setup to just one surface.

The subsurface was playing havoc with layer shell stuff, and I don't
think any potential efficiency gain is worth the complicated code to
work out how big the subsurface should be. Instead, the entry code now
just draws directly onto the main surface.

Damage information should be passed to glTexSubImage2D() in future, to
avoid redrawing the entire window every keypress.

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