Re: Setting multiple effects on an Open AL Source

Hi Richard,

Firstly you need to determine if the playback device supports more than one
effect send (not all implementations do).   You can request a particular
number of effect sends per Source at context creation time using the
attributes parameter of alcCreateContext, but you need to ask how many you
got after the context has been created and made current using
alcGetIntegerv(pDeviceHandle, ALC_MAX_AUXILIARY_SENDS, 1, &iSends).   This
is explained in more detail in "Tutorial 1" of the Effects Extension
Guide.pdf in the OpenAL SDK.  Assuming the underlying device supports more
than one effect send per source then ...

Tutorial 4 of the same document shows how to configure the effect sends of
a Source: -

// Assume uiEffectSlot[0] and uiEffectSlot[1] are Auxiliary Effect Slot IDs
loaded with some effects
// uiFilter[0] is a Filter ID
// uiSource is a Source ID

// Set Source Send 0 to feed uiEffectSlot[0] without filtering
alSource3i(uiSource,AL_AUXILIARY_SEND_FILTER, uiEffectSlot[0], 0, NULL);
if (alGetError() != AL_NO_ERROR)
      printf("Failed to configure Source Send 0\n");

// Set Source Send 1 to feed uiEffectSlot[1] with filter uiFilter[0]
alSource3i(uiSource,AL_AUXILIARY_SEND_FILTER, uiEffectSlot[1], 1,
uiFilter[0]);
if (alGetError() != AL_NO_ERROR)
      printf("Failed to configure Source Send 1\n");

Hope that helps,

Dan
Creative Labs (UK) Ltd.

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             Richard Rosario                                              
             <richardrosario@g                                            
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                                                                   Subject
                                       [Openal-devel] Setting multiple    
             03/27/2009 01:29          effects on an Open AL Source        
             PM                                                            
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Greetings to you,
effects on a source in openAL. How do I set multiple effects on a single
source.
If multiple effects can be set through Source's Auxiliary Sends, then only
two effects can be set.Is there any other way to set multiple effects on a
Source.Can you give sample code.


Thanks and regards
Richard

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