[cl-opengl-devel] Patch for faster texture uploads

[Bart Botta]

gl:tex-image-2d seems a bit slow (~23 sec for a 1k by 1k texture on
SBCL 1.0.2 win32), attached patch speeds it up  ~100x (to ~0.25 sec).

Problem was that the element type in with-opengl-array wasn't constant
(since it had been passed as a parameter to tex-image-2d) so cffi
couldn't optimize for a specific type. Patch moves the type check out
of the copy loop, and duplicates the loop for each type, so each case
can be optimized individually.

--
Bart
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