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Base air absorption on distance attenuation, try 2

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This commit is contained in:
Chris Robinson 2009-11-24 21:19:11 -08:00
parent 35a9ccb41f
commit 877f4340ba
1 changed files with 9 additions and 8 deletions
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17
Alc/ALu.c
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@ -628,17 +628,18 @@ static ALvoid CalcSourceParams(const ALCcontext *ALContext, ALsource *ALSource,
}
// Distance-based air absorption
if(ALSource->AirAbsorptionFactor > 0.0f && ALSource->DistanceModel != AL_NONE)
if(ALSource->AirAbsorptionFactor > 0.0f && flAttenuation < 1.0f)
{
ALfloat dist = Distance-MinDist;
ALfloat absorb;
ALfloat absorb = 0.0f;
if(dist < 0.0f) dist = 0.0f;
// Absorption calculation is done in dB
absorb = (ALSource->AirAbsorptionFactor*AIRABSORBGAINDBHF) *
(dist*MetersPerUnit);
// Convert dB to linear gain before applying
absorb = pow(10.0, absorb/20.0);
if(flAttenuation > 0.0f)
{
absorb = (MinDist/flAttenuation - MinDist)*MetersPerUnit *
(ALSource->AirAbsorptionFactor*AIRABSORBGAINDBHF);
// Convert dB to linear gain before applying
absorb = pow(10.0, absorb/20.0);
}
DryGainHF *= absorb;
for(i = 0;i < MAX_SENDS;i++)
WetGainHF[i] *= absorb;