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More accurate attenuation curve

This commit is contained in:
Jack Andersen 2018-10-25 21:44:56 -10:00
parent 885a2d2154
commit b4c073c373
2 changed files with 7 additions and 13 deletions
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1
include/amuse/Emitter.hpp
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@ -45,6 +45,7 @@ class Emitter : public Entity
float m_falloff;
bool m_doppler;
bool m_dirty = true;
Voice::VolumeCache m_attCache;
friend class Engine;
void _destroy();

19
lib/Emitter.cpp
View File

@ -33,21 +33,14 @@ float Emitter::_attenuationCurve(float dist) const
if (dist > m_maxDist)
return 0.f;
float t = dist / m_maxDist;
if (m_falloff < 0.f)
if (m_falloff >= 0.f)
{
float tmp = t * 10.f + 1.f;
tmp = 1.f / (tmp * tmp);
return (1.f + m_falloff) * (-t + 1.f) + -m_falloff * tmp;
}
else if (m_falloff > 0.f)
{
float tmp = (t - 1.f) * 10.f - 1.f;
tmp = -1.f / (tmp * tmp) + 1.f;
return (1.f - m_falloff) * (-t + 1.f) + m_falloff * tmp;
return 1.f - (m_falloff * t * t + (1.f - m_falloff) * t);
}
else
{
return -t + 1.f;
float omt = 1.f - t;
return 1.f - ((1.f + m_falloff) * t - (1.f - omt * omt) * m_falloff);
}
}
@ -86,10 +79,10 @@ void Emitter::_update()
/* Calculate attenuation */
float att = _attenuationCurve(dist);
att = (m_maxVol - m_minVol) * att + m_minVol;
att = m_attCache.getVolume(att, false);
if (att > FLT_EPSILON)
{
att = (1.f - att) * m_minVol + att * m_maxVol;
/* Apply pan law */
float thisCoefs[8] = {};
m_vox->_panLaw(thisCoefs, frontPan, backPan, span);