Hi,
the GPURegionOfInterestCallback does not do async read at the moment,
but you can have a look at the osgscreencapture example. Specifically
check the code path for the --double-pbo command line option.
Also see this page, it has the best explanation of async pbo I've come
across.
http://www.songho.ca/opengl/gl_pbo.html
Getting data from GPU to CPU is still a bottleneck for many apps, make
sure you send back as little as possible.
cheers
jp
On 19/10/2011 19:13, Poirier, Guillaume wrote:
Hello J-P,
I saw on the OSG forum archives your GPURegionOfInterestCallback code.
Can it provide asynchronous GPU -> CPU readback ?
I don't know much about PBO and I currently does the readback by simply
attaching an image to my RTT camera, however it
slows down the application significantly. Can you show an example of how
to use the GPURegionOfInterestCallback ?
cheers,
guillaume
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