Am 24.01.2014 um 17:58 schrieb Thomas Sevaldrud <[email protected]>:
> After a bit of browsing about in the ANGLE and Qt code, I found that the
> ANGLE GL implementation is not capable of multithreaded access, so I guess
> I'll have to rewrite this a bit :-)
I found this free sample chapter of "OpenGL Insights"
http://www.seas.upenn.edu/~pcozzi/OpenGLInsights/OpenGLInsights-AsynchronousBufferTransfers.pdf
very helpful. Besides techniques using multiple threads with shared GL context
it shows usage of (Pixel) Buffer Objects in a "Round-Robin Fashion", "Buffer
Respecification" and other techniques for maximising buffer upload/download
transfer rates (and using the time for other stuff once asynchronous DMA
transfer has started, e.g. process the "buffer from the previous frame" while
already uploading data for the next frame).
In fact, in chapter 28.6.4 the conclusion seems to be to not use multithreaded
OpenGL and shared contexts but rather limit thread usage for CPU intensive
"worker threads". Examples of multithread usage are given.
Maybe that helps ;)
Cheers,
Oliver
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