[Openal] Re: Exploding Filters

[Daniel PEACOCK]

Hi Col,

One other thought ... when you retrieve the pointers to the EFX functions
from the OpenAL library, are you specifiying the correct calling convention
(__cdecl) when casting the return from alGetProcAddress ?   The efx.h
includes typedefs for pointers to each of the functions if you want to use
those.

Dan

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             Daniel PEACOCK                                                
             <dpeacock at creativ                                             
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                                       [Openal] Re: Exploding Filters      
                                                                           
             08/25/2006 08:31                                              
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Hi Col,

Thanks for mail.  Unfortunately I'm unable to reproduce the problem here -
those calls seem to work fine on all 3 different devices (X-Fi, Generic
Hardware, and Generic Software) on my machine.

The latest Creative AL 1.1 SDK includes a sample application called
EFXFilter that makes those calls - can you try running that and seeing if
that crashes for you too ?  If it does, could you please make sure you have
the latest drivers installed ?

Thanks,

Dan
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             Colin Walder
             <cwalder at frd.co.u
             k>                                                         To
                                       openal at opensource.creative.com
             08/25/2006 01:02                                           cc
             AM                        dpeacock at creativelabs.com
                                                                   Subject
                                       Exploding Filters










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


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