[Openal] AL_POSITION affects Doppler Shift

[Tim Mahrt]

I'm currently working with Doppler Shifts and I've run into a bit of a
problem that has confused me.

According to the formula in the OpenAL 1.1 Spec, the position of a
source has no effect with the doppler effect--however, I was playing
around with some code that was referenced on a newsgroup somewhere,
altest.cpp where I derived the following:

//carSirenZPos oscillates between 15 and -15
	alDopplerFactor(4.f);
	alSource3f(soundSource, AL_VELOCITY, 10.0, 0.0f, 0.0f);
	alSource3f(soundSource, AL_POSITION, (float) carSirenZPos / 10, 0.3f, 0.f);	

When the position is positive, regardless of whether its increasing or
decreasing, the f' > f.  When the position is negative, f' < f.

But I thought the doppler effect was independent of position?  Did I
do something wrong?

Also, the listener sits at (0, 0, 0) and doesn't move--the only thing
that changes is the soundSource.

An executable of my code can be found here if that helps:
https://netfiles.uiuc.edu/tmahrt2/shared/OpenGL/OpenAL/OpenAL%20Test.zip

Just extract all of the contents of the file and run the exe.  "z" on
the keyboard plays the sound with looping.  "x" plays it just once.

Thanks,
Tim