Hello Yi Lin,
my question is : how to store the picture of every frame to buffer more quickly?
Essentially, readPixels() stalls the frame until the whole pipeline is
flushed, then reads the framebuffer. This is what introduces the
slowdown you see. What you would want in order to make this faster is to
defer reading the framebuffer to the GPU, so it can read it when it
makes sense to do so and so not stall.
I'm not sure (I can't remember the specifics) but I think either
ScreenCaptureHandler or WindowCaptureCallback have a path to use
double-buffered PBOs to read the framebuffer. This is what you should
use. The result you get will be one frame late, but at least it will be
faster (won't stall the GPU as readPixels would).
Hope this helps,
J-S
--
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Jean-Sebastien Guay jean_...@videotron.ca
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