Re: [Qemu-devel] [PATCH] OSX x86_64 host support

[Markus Hitter]

Am 09.12.2007 um 17:52 schrieb Mike Kronenberg:

> On the other hand, the QT implementation is and remains the fastest  
> solution, as no of the other allows directly accessing the video- 
> buffer, which results in way more copying.

Likely, QT doesn't come with it's own set of video drivers, but uses  
some core technology of OS X. It's obviously possible to get  
CoreGraphics to avoid single buffering, but it's hard to find  
documentation about this, since Apple obviously wants to avoid such  
"hacks".

Additionally, flushing the graphics buffer is limited to screen  
refresh rate, which makes performance comparisons difficult: <http:// 
developer.apple.com/documentation/Performance/Conceptual/Drawing/ 
Articles/FlushingContent.html#//apple_ref/doc/uid/TP40001835>

At last, there is sample code which shows how to get pixels onto the  
screen without using the CPU at all: <http://developer.apple.com/ 
samplecode/TextureRange/index.html>


HTH,
Markus

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Dipl. Ing. Markus Hitter
http://www.jump-ing.de/