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Merge pull request #3122 from birarda/audio-rolloff

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change the audio rolloff function
This commit is contained in:
Clément Brisset 2014-07-03 13:49:59 -07:00
commit 3729428c2e
1 changed files with 15 additions and 13 deletions
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28
assignment-client/src/audio/AudioMixer.cpp
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@ -89,6 +89,9 @@ AudioMixer::~AudioMixer() {
delete _listenerUnattenuatedZone;
}
const float ATTENUATION_BEGINS_AT_DISTANCE = 1.0f;
const float ATTENUATION_AMOUNT_PER_DOUBLING_IN_DISTANCE = 0.18f;
void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuffer* bufferToAdd,
AvatarAudioRingBuffer* listeningNodeBuffer) {
float bearingRelativeAngleToSource = 0.0f;
@ -163,19 +166,18 @@ void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuf
glm::vec3 rotatedSourcePosition = inverseOrientation * relativePosition;
const float DISTANCE_SCALE = 2.5f;
const float GEOMETRIC_AMPLITUDE_SCALAR = 0.3f;
const float DISTANCE_LOG_BASE = 2.5f;
const float DISTANCE_SCALE_LOG = logf(DISTANCE_SCALE) / logf(DISTANCE_LOG_BASE);
// calculate the distance coefficient using the distance to this node
float distanceCoefficient = powf(GEOMETRIC_AMPLITUDE_SCALAR,
DISTANCE_SCALE_LOG +
(0.5f * logf(distanceSquareToSource) / logf(DISTANCE_LOG_BASE)) - 1);
distanceCoefficient = std::min(1.0f, distanceCoefficient);
// multiply the current attenuation coefficient by the distance coefficient
attenuationCoefficient *= distanceCoefficient;
if (distanceBetween >= ATTENUATION_BEGINS_AT_DISTANCE) {
// calculate the distance coefficient using the distance to this node
float distanceCoefficient = 1 - (logf(distanceBetween / ATTENUATION_BEGINS_AT_DISTANCE) / logf(2.0f)
* ATTENUATION_AMOUNT_PER_DOUBLING_IN_DISTANCE);
if (distanceCoefficient < 0) {
distanceCoefficient = 0;
}
// multiply the current attenuation coefficient by the distance coefficient
attenuationCoefficient *= distanceCoefficient;
}
// project the rotated source position vector onto the XZ plane
rotatedSourcePosition.y = 0.0f;