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Added: Specific code for amplitude based rolloff to avoid unneccesary log10 and pow calls and improve performance
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1 changed files with 50 additions and 3 deletions
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@ -65,12 +65,59 @@ sint32 ISource::computeManualRollOff(sint32 volumeMB, sint32 mbMin, sint32 mbMax
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// common method used only with OptionManualRolloff. return the rolloff in amplitude ratio (gain)
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// common method used only with OptionManualRolloff. return the rolloff in amplitude ratio (gain)
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float ISource::computeManualRolloff(double alpha, float sqrdist, float distMin, float distMax)
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float ISource::computeManualRolloff(double alpha, float sqrdist, float distMin, float distMax)
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{
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{
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static const sint32 mbMin = -10000;
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/*static const sint mbMin = -10000;
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static const sint32 mbMax = 0;
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static const sint mbMax = 0;
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sint32 rolloffMb = ISource::computeManualRollOff(mbMax, mbMin, mbMax, alpha, sqrdist, distMin, distMax);
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sint32 rolloffMb = ISource::computeManualRollOff(mbMax, mbMin, mbMax, alpha, sqrdist, distMin, distMax);
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float rolloffGain = (float)pow(10.0, (double)rolloffMb / 2000.0);
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float rolloffGain = (float)pow(10.0, (double)rolloffMb / 2000.0);
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clamp(rolloffGain, 0.0f, 1.0f);
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clamp(rolloffGain, 0.0f, 1.0f);
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return rolloffGain;
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return rolloffGain;*/
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static const double mbMin = -10000;
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static const double mbMax = 0;
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if (sqrdist < distMin * distMin)
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{
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// no attenuation
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return 1.0f;
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}
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else
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{
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double dist = (double)sqrt(sqrdist);
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if (alpha < 0.0f)
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{
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// inverse distance rolloff
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float rolloff = distMin / dist;
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if (alpha <= -1.0f) return rolloff;
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double mb = mbMin * (dist - distMin) / (distMax - distMin);
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float mbrolloff = (float)pow(10.0, (double)mb / 2000.0);
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return ((1.0 + alpha) * mbrolloff - alpha * rolloff);
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}
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else
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{
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if (sqrdist > distMax * distMax)
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{
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// full attenuation
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return 0.0f;
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}
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if (alpha == 0.0f)
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{
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// linearly descending volume on a dB scale
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double mb = mbMin * (dist - distMin) / (distMax - distMin);
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return (float)pow(10.0, (double)mb / 2000.0);
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}
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else // if (alpha > 0.0f)
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{
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// linear distance rolloff
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float rolloff = (distMax - dist) / (distMax - distMin);
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if (alpha >= 1.0f) return rolloff;
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double mb = mbMin * (dist - distMin) / (distMax - distMin);
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float mbrolloff = (float)pow(10.0, (double)mb / 2000.0);
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return ((1.0 - alpha) * mbrolloff + alpha * rolloff);
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}
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}
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}
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}
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}
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} // NLSOUND
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} // NLSOUND
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