i965: Skip reallocating the private MSAA miptree, unless it's resized

Graphics / Mesa 3D Graphics Library / Mesa - Eric Anholt [anholt.net] - 24 March 2014 13:15 UTC

Even if the singlesample_mt got reopened from DRI due to pageflipping/buffer swapping, our private miptree shouldn't need any changes.

Improves performance of a little swapbuffers-loving microbenchmark with MSAA forced on, by 1.2371% +/- 0.624802% (n=102)

dd4b226 i965: Skip reallocating the private MSAA miptree, unless it's resized.
src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 45 +++++++++++++++----------
1 file changed, 28 insertions(+), 17 deletions(-)

Upstream: cgit.freedesktop.org

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