[Openal] Mute when switch windows

[Dave Shillito]

Hi All, 

I have just switched our app over from DirectSound to OpenAL.

In the DirectSound version of the app when we run windowed and switch
focus to a new window our sound would be muted.  Now in the OpenAL
version the sound continues.  

I think this was since I used "SetCooperativeLevel(hwnd,
DSSCL_PRIORITY)" in DirectSound.

Is it possible to recreate the DirectSound behaviour in OpenAL?

I was looking at alcSuspendContext & alcProcessContext, but was unclear
as to what would happen if the app continued to run - triggering sounds
in the background.  

Cheers,

DAve





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