Re: [AD] Allegro's mixer

[Chris <kcat@xxxxxxxxxx>]

Ben Davis wrote:

> DUMB manages to combine 24-bit samples with a 16-bit volume:
>
> #define MULSC(a, b) ((int)((LONG_LONG)((a) << 4) * ((b) << 12) >> 32))
>  

Wouldn't ((int)((LONG_LONG)(a) * (b) >> 16)) be faster? And that code 
uses LONG_LONG, which is 64-bit. Those are dangerous to use in 
interrupts/timers. DUMB is fine since it's poll-driven, but Allegro's 
mixer runs in a timer or interrupt, depending on the driver. Unless I'm 
missing something, we need to stick with 32-bit integer arithmetic in 
the mixer.

- Kitty Cat