[Bug 98478] glCopyTexSubImage2D is much slower than glDrawArrays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98478

--- Comment #3 from Kenneth Graunke <kenneth at whitecape.org> ---
The next step would be to determine what method i965 is using for
CopyTexSubImage:

1. BLORP (should be fast)
2. BLT (should be slow)
3. CPU maps (should be slow)

Putting a breakpoint in intelCopyTexSubImage and stepping through it should
make it pretty clear which is happening, and if we're falling off the fast
path, why.

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