#jogamp @ irc.freenode.net - 20140303 05:05:50 (UTC)
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20140303 11:37:51 <xranby> This explains performance issues we have seen with more complex opengl es applications running on the RaspberryPi: http://www.raspberrypi.org/phpBB3/viewtopic.php?p=51859#p51859 - "Every time you read data from the GPU, you will block until the queue is drained, there will be interrupts and task switches on the GPU and the ARM and lots of wasted time. This could take a few milliseconds. So. ideally never read from GPU (including glGetError). If you must,
20140303 11:38:40 <xranby> also "All opengles commands go through an asynchronous message queue to the GPU. This has a bandwidth of ~100MB/s."
20140303 13:54:36 <sgothel1> all depends on GL impl. granularity of sync. For sure, e.g. ReadPixels requires an internal sync (finish or even a sync-object). Others 'get' methods may be faster, like GetInteger or GetError .. however it depends on the impl.
20140303 13:54:48 <sgothel1> one reason we do cache a lot states
20140303 13:56:46 <sgothel1> btw .. BCM released the whole GL driver now for good .. it seems .. under BSD
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