[Openal] EFX Filter Defaults

[Daniel PEACOCK]

Hi Colin,

In EFX, Filters can be added to the direct (dry) path of a Source and / or
the send (wet) path(s).   There is no automatic way to add the same filter
to both the direct path and one (or more) of the Auxiliary Send paths.  You
therefore need to make the explicit calls to set this up. e.g.

A Filter can be added to the dry path using :-

alSourcei(uiSourceID, AL_DIRECT_FILTER, uiFilterID)

where :     uiFilterID is the name of a Filter object


The same Filter, or a different one, can be added to a particular Auxiliary
Send using :-

alSource3i(uiSourceID, AL_AUXILIARY_SEND_FILTER, uiAuxEffectSlotID,
iSendNum, uiFilterID)

where :     uiAuxEffectSlotID is the name of a Auxiliary Effect Slot object
      iSendNum is the index of the Source's Send to use
      uiFilterID is the name of a Filter object

NOTE : The number of Auxiliary Sends available on each Source is platform
dependent, but can be retrieved using the following call : -

alcGetIntegerv(pDevice, ALC_MAX_AUXILIARY_SENDS, 1, &iNumSends)

where :     pDevice is the ALCDevice opened
      iNumSends gets the number of Auxiliary Sends available per Source

Dan
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             Colin Walder                                                  
             <cwalder at frd.co.u                                             
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                                       [Openal] EFX Filter Defaults        
                                                                           
             06/07/2006 07:57                                              
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Hey guys,

Does anyone know if there's a way to set openal to have as a default that
direct filters are applied to sends. I can get round it manually but would
be a bit cleaner if i could just tell openal to do it...maybe a post-fader
send option which uses the filtered sound? Or does the
AL_EFFECTSLOT_AUXILIARY_SEND_AUTO do this anyhow?

Cheers,

Col

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