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To do so, merge the remainnig necessary code from the buffers, blit, span, and
screen code to shared, and replace it with those.
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Putting the bufmgr in the screen is not thread-safe since the emit_reloc
changes. It also led to a significant performance hit from pthread usage
for the attempted thread-safety (up to 12% of a cpu spent on refcounting
protection in single-threaded 965). The motivation had been to allow
multi-context bufmgr sharing in classic mode, but it wasn't worth the cost.
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This is currently believed to work but be a significant performance loss.
Performance recovery should be soon to follow.
The dri_bo_fake_disable_backing_store() call was added to allow backing store
disable like bufmgr_fake.c did, which is a significant performance win (though
it's missing the no-fence-subdata part).
This commit is a squash merge of the 965-ttm branch, which had some history
I wanted to avoid pulling due to noisiness and brokenness at many points
for git-bisecting.
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This fixes mis-rendering if back/depth fail to get set up as tiled. While it
probably won't ever be the case now that the pitch limits are loosened, this is
still the right thing to do.
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This driver comes from Tungsten Graphics, with a few further modifications by
Intel.
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