[Openal] Exploding Filters

[Colin Walder]

I'm using the x-fi device on my computer but it also happens on generic 
software on another pc we tested it on. The filter is created and set to 
AL_FILTER_LOWPASS successfully and if we use alFilteri to set the 
AL_LOWPASS_GAIN or AL_LOWPASS_GAINHF, the filter seems to work (although 
obviously the input is clamped to either 1 or 0). The crash only happens 
using alFilterf in the following lines of code 

alFilterf(sfx, AL_LOWPASS_GAIN, 1.0f);
alFilterf(sfx, AL_LOWPASS_GAINHF, 0.5f);

Where sfx is the filter.

I'm pretty sure the steps leading up to this are ok as it works ok for 
alFilteri and when we look in memory the value of sfx in memory is the 
same as when it is created (in this case 1) and is tested (successfully) 
with alIsFilter just before these calls are made.

Cheers,


Col