[Openal] double buffering and context

[Garin Hiebert]

> I am not entirely sure but I guess I need double
> buffering, my sounds flicker during play, one source
> turns off before the next plays

What is this "flickering"?  If you have one sample in a buffer and  
attached to a source, calling play on that source should result in  
continuous playback of that sample from start to finish.  If you are  
trying to "stitch" the contents of multiple buffers together to get  
continuous playback, the trick is to do it using OpenAL's queueing  
mechanism -- play it back on _one_ source, not multiple sources.  If  
you use queueing, then as long as you have attached a new buffer  
before the source stops playing the first, it will play  
continuously.  See "openal\demos\altest" in the source tree for an  
example (the "Streaming Test").

Trying to get continuous playback using two sources can't be done  
reliably -- there will inevitably be audible gaps.  You'll hear it if  
any samples are missed between detecting that one source is stopped  
and playing the new one.  Use queueing and that problem goes away,  
because the OpenAL library will guarantee proper behavior.

Garin