alSourcefv help wanted

[AdamStrangeParticipant]

I’m trying to work out stereo panning using alSourcefv, but can’t get it to compile.

the function is:

Function alSourcefv( source:ALuint, param:ALenum, values:ALfloat Ptr )

Here’s the code I tried, but it won’t allow me to use the array:

Monkey

Local angles:ALfloat[] = New ALfloat[2] angles[0] = -1.5 - _pan angles[1] = 1.5 - _pan alSourcefv( _alSource, AL_STEREO_ANGLES, Varptr angles )

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Local angles:ALfloat[] = New ALfloat[2] angles[0] = -1.5 - _pan angles[1] = 1.5 - _pan   alSourcefv( _alSource, AL_STEREO_ANGLES, Varptr angles )

I am sure that I am just referencing angles with the wrong varptr or something ?

anyone be able to help?

[abakoboParticipant]

I think you have to use

Monkey

[crayon-5cba8faddbb5c045882977 inline="true" ]angles.Data or varptr angles[0]

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[crayon-5cba8faddbb5c045882977 inline="true" ]angles.Data or varptr angles[0]

[/crayon]

which are technically the same. i.e. a pointer to ALFloat (pointing the first element of the array)

“angles” alone is actually a pointer so “Varptr angles” is a pointer to a pointer (to be seen in C sys programming but probably not in mx2 sources)
It’s common in C/C++ libs to send an array by sending a pointer to the first element (and a count if the number of elements is variable)

[AdamStrangeParticipant]

Brilliant – thanks, the angles[0] was what I needed

[Mark SiblyKeymaster]

The ‘Data’ property of array also returns a pointer to the elements, ie: ‘blah.Data’ is same as ‘Varptr blah[0]’.

[Author]

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