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implement a new rolloff function

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This commit is contained in:
Stephen Birarda 2014-07-03 11:05:12 -07:00
parent 42fc98161b
commit fe52787572
1 changed files with 5 additions and 9 deletions
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14
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;
@ -162,16 +165,9 @@ 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);
float distanceCoefficient = 1 - (logf(distanceBetween / ATTENUATION_BEGINS_AT_DISTANCE) / logf(2.0f)
* ATTENUATION_AMOUNT_PER_DOUBLING_IN_DISTANCE);
// multiply the current attenuation coefficient by the distance coefficient
attenuationCoefficient *= distanceCoefficient;