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OpenAL sound: Use a simpler distance model
In createPlayingSoundAt(), AL_ROLLOFF_FACTOR is not set, so it has the default value of 1.0, this makes the equation of the currently used AL_EXPONENT_DISTANCE distance model identical to the equation of the simpler AL_INVERSE_DISTANCE distance model. Using AL_INVERSE_DISTANCE means an exponent is not processed, exponents are quite intensive to process. There is no change in sound attenuation behaviour. The commented-out AL_ROLLOFF_FACTOR value is removed as it would now have a different effect if used.
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@ -317,7 +317,7 @@ public:
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return;
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}
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alDistanceModel(AL_EXPONENT_DISTANCE);
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alDistanceModel(AL_INVERSE_DISTANCE);
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infostream<<"Audio: Initialized: OpenAL "<<alGetString(AL_VERSION)
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<<", using "<<alcGetString(m_device, ALC_DEVICE_SPECIFIER)
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@ -409,7 +409,6 @@ public:
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alSourcei(sound->source_id, AL_SOURCE_RELATIVE, false);
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alSource3f(sound->source_id, AL_POSITION, pos.X, pos.Y, pos.Z);
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alSource3f(sound->source_id, AL_VELOCITY, 0, 0, 0);
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//alSourcef(sound->source_id, AL_ROLLOFF_FACTOR, 0.7);
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alSourcef(sound->source_id, AL_REFERENCE_DISTANCE, 30.0);
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alSourcei(sound->source_id, AL_LOOPING, loop ? AL_TRUE : AL_FALSE);
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volume = MYMAX(0.0, volume);
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