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rework the FreeVerb effect mix calculations

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This commit is contained in:
Stephen Birarda 2013-06-05 16:04:58 -07:00
parent 60b018b8b2
commit 58752d7e2d
1 changed files with 15 additions and 4 deletions
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19
audio-mixer/src/main.cpp
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@ -234,12 +234,23 @@ int main(int argc, const char* argv[]) {
otherAgentFreeVerb = freeVerbIterator->second;
}
const float DISTANCE_REVERB_LOG_REMAINDER = 0.32f;
const float WETNESS_DOUBLING_DISTANCE_FACTOR = 2.0f;
const float MAX_REVERB_DISTANCE = 160.0f;
// higher value increases wetness more quickly with distance
const float WETNESS_CALC_EXPONENT_BASE = 2.0f;
const float MAX_EXPONENT = logf(MAX_REVERB_DISTANCE) / logf(WETNESS_DOUBLING_DISTANCE_FACTOR);
const int MAX_EXPONENT_INT = floorf(MAX_EXPONENT);
float DISTANCE_REVERB_LOG_REMAINDER = fmodf(MAX_EXPONENT, MAX_EXPONENT_INT);
const float DISTANCE_REVERB_MAX_WETNESS = 1.0f;
float effectMix = powf(2.0f, (0.5f * logf(distanceSquareToSource)
/ logf(2.0f)) - DISTANCE_REVERB_LOG_REMAINDER)
* DISTANCE_REVERB_MAX_WETNESS / 64.0f;
float effectMix = powf(WETNESS_CALC_EXPONENT_BASE,
(0.5f * logf(distanceSquareToSource) / logf(WETNESS_CALC_EXPONENT_BASE))
- DISTANCE_REVERB_LOG_REMAINDER);
effectMix *= DISTANCE_REVERB_MAX_WETNESS / (powf(WETNESS_DOUBLING_DISTANCE_FACTOR,
MAX_EXPONENT_INT));
otherAgentFreeVerb->setEffectMix(effectMix);
}