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Changed: Avoid some more sqrt calculations

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kaetemi 2012-06-03 02:00:32 +02:00
parent 971f753706
commit a3616abd5c
1 changed files with 4 additions and 3 deletions
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7
code/nel/src/sound/driver/source.cpp
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@ -82,13 +82,13 @@ float ISource::computeManualRolloff(double alpha, float sqrdist, float distMin,
} }
else else
{ {
double dist = (double)sqrt(sqrdist);
if (alpha < 0.0f) if (alpha < 0.0f)
{ {
double dist = (double)sqrt(sqrdist);
// inverse distance rolloff // inverse distance rolloff
float rolloff = distMin / dist; float rolloff = distMin / dist;
if (alpha <= -1.0f) return rolloff; if (alpha <= -1.0f) return rolloff;
double mb = mbMin * (dist - distMin) / (distMax - distMin); double mb = mbMin * (dist - distMin) / (distMax - distMin);
float mbrolloff = (float)pow(10.0, (double)mb / 2000.0); float mbrolloff = (float)pow(10.0, (double)mb / 2000.0);
return ((1.0 + alpha) * mbrolloff - alpha * rolloff); return ((1.0 + alpha) * mbrolloff - alpha * rolloff);
@ -100,6 +100,7 @@ float ISource::computeManualRolloff(double alpha, float sqrdist, float distMin,
// full attenuation // full attenuation
return 0.0f; return 0.0f;
} }
double dist = (double)sqrt(sqrdist);
if (alpha == 0.0f) if (alpha == 0.0f)
{ {
// linearly descending volume on a dB scale // linearly descending volume on a dB scale
@ -111,7 +112,7 @@ float ISource::computeManualRolloff(double alpha, float sqrdist, float distMin,
// linear distance rolloff // linear distance rolloff
float rolloff = (distMax - dist) / (distMax - distMin); float rolloff = (distMax - dist) / (distMax - distMin);
if (alpha >= 1.0f) return rolloff; if (alpha >= 1.0f) return rolloff;
double mb = mbMin * (dist - distMin) / (distMax - distMin); double mb = mbMin * (dist - distMin) / (distMax - distMin);
float mbrolloff = (float)pow(10.0, (double)mb / 2000.0); float mbrolloff = (float)pow(10.0, (double)mb / 2000.0);
return ((1.0 - alpha) * mbrolloff + alpha * rolloff); return ((1.0 - alpha) * mbrolloff + alpha * rolloff);