Re: stereo panning change in 1.15

On 07/13/2013 11:24 AM, Alan Witkowski wrote:
> My question is: was this drastic change intentional? Is there an easy way
> replicate the old behavior without doing the calculations manually?

It was intentional, yes. The problem is that you'll not have that 
behavior with any other implementation, and you won't have it with 
OpenAL Soft if HRTF is enabled. Since it was the original expected 
behavior to not pan like that, and you're not guaranteed to be able to 
depending on the output mode, to me it seems best to be consistent.

You can replicate the old behavior by moving the source in an arc above 
the listener. For instance:

alSourcef(mSource, AL_REFERENCE_DISTANCE, 1.0f);
alSourcei(mSource, AL_SOURCE_RELATIVE, AL_TRUE);

ALfloat pan[3];
pan[0] = x_pan; // from -1 (left) to +1 (right)
pan[1] = sqrt(1.0f - x_pan*x_pan);
pan[2] = 0.0f;
alSourcefv(mSource, AL_POSITION, pan);

This will be compatible with HRTF and other implementations.
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