[OT] Quartz Extreme in developer previews?
[OT] Quartz Extreme in developer previews?
- Subject: [OT] Quartz Extreme in developer previews?
- From: Allan Odgaard <email@hidden>
- Date: Sat, 13 Jul 2002 17:50:30 +0200
Hi there,
Sorry about being off topic, but recently I started a thread on this
list talking about the current speed of Quartz.
It was (more or less) the conclusion that the current version of Quartz
does all rendering in main memory and afterward copy it to the graphics
card, imposing severe bottlenecks on even simple things like clearing
the background of a window (which would be limited to my bus speed of
about 190 MB/s excl. the speed of main memory of about 300 MB/s).
One suggested that Quartz Extreme would store off screen bitmaps in the
graphics memory, so that the blitter could be use for all these trivial
clear, copy and compose functions that make up most layer operations --
which should make the speed of Quartz closer to the 2.1 GB/s that my
GeForce claims to offer in bandwidth.
Today I was able to benchmark Jaguar developer preview 2 and to my big
disappointment nothing had really changed. The speed was maybe twice as
fast, but that was all... scrolling in the finder is still slow,
resizing windows as well, and my benchmark programs revealed a lot of
cpu work involved in scrolling window contents, which was everything but
real time...
My only hope is that QE is disabled in current developer previews, which
I heard from a friend, who read it somewhere -- i.e. very inconclusive.
That is why I write this list, hoping that someone could shed some light
on the issue. If the subject is covered by NDA then I would really
appreciate just an anonymous private e-mail, cause some of my
development plans really rely on faster graphics, and if Apple can't
provide that then I'll unfortunately have to find another platform for
my work :-(
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