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/macosx-10.10.1/OpenAL-54/Source/OpenAL/
H A DoalSource.cpp3878 Float32 vsl[3]; // source to listener vector local
3882 mOwningContext->GetListenerPosition(&vsl[0], &vsl[1], &vsl[2]);
3885 vsl[0] -= mPosition[0];
3886 vsl[1] -= mPosition[1];
3887 vsl[2] -= mPosition[2];
3888 aluNormalize(vsl); // Normalized source to listener vector
3896 angle = 180.0 * acos (aluDotproduct(vsl, coneDirection))/M_PI; // convert from radians to degrees

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