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Redefine audio zone attenuation coefficient of 1.0 to mean "silent at any distance"

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instead of extreme rate of falloff with distance.
This commit is contained in:
Ken Cooke 2019-11-09 09:32:00 -08:00
parent 2a30f0fcba
commit 63eb905712
1 changed files with 5 additions and 1 deletions
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6
assignment-client/src/audio/AudioMixerSlave.cpp
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@ -782,7 +782,7 @@ float computeGain(float masterAvatarGain,
gain *= std::max(1.0f - d / (distanceLimit - ATTN_DISTANCE_REF), 0.0f);
gain = std::min(gain, ATTN_GAIN_MAX);
} else {
} else if (attenuationPerDoublingInDistance < 1.0f) {
// translate a positive zone setting to gain per log2(distance)
const float MIN_ATTENUATION_COEFFICIENT = 0.001f; // -60dB per log2(distance)
float g = glm::clamp(1.0f - attenuationPerDoublingInDistance, MIN_ATTENUATION_COEFFICIENT, 1.0f);
@ -792,6 +792,10 @@ float computeGain(float masterAvatarGain,
float d = (1.0f / ATTN_DISTANCE_REF) * std::max(distance, HRTF_NEARFIELD_MIN);
gain *= fastExp2f(fastLog2f(g) * fastLog2f(d));
gain = std::min(gain, ATTN_GAIN_MAX);
} else {
// translate a zone setting of 1.0 be silent at any distance
gain = 0.0f;
}
return gain;