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Use sqrt() in pan law

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This commit is contained in:
Jack Andersen
2017-11-28 00:05:59 -10:00
parent b890a76e20
commit 89233e98b5
2 changed files with 20 additions and 4 deletions
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20
lib/Voice.cpp
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@@ -979,10 +979,10 @@ void Voice::_panLaw(float coefs[8], float frontPan, float backPan, float totalSp
case AudioChannelSet::Stereo:
default:
/* Left */
coefs[0] = -frontPan * 0.5f + 0.5f;
coefs[0] = std::sqrt(-frontPan * 0.5f + 0.5f);
/* Right */
coefs[1] = frontPan * 0.5f + 0.5f;
coefs[1] = std::sqrt(frontPan * 0.5f + 0.5f);
break;
@@ -990,18 +990,22 @@ void Voice::_panLaw(float coefs[8], float frontPan, float backPan, float totalSp
/* Left */
coefs[0] = -frontPan * 0.5f + 0.5f;
coefs[0] *= -totalSpan * 0.5f + 0.5f;
coefs[0] = std::sqrt(coefs[0]);
/* Right */
coefs[1] = frontPan * 0.5f + 0.5f;
coefs[1] *= -totalSpan * 0.5f + 0.5f;
coefs[1] = std::sqrt(coefs[1]);
/* Back Left */
coefs[2] = -backPan * 0.5f + 0.5f;
coefs[2] *= totalSpan * 0.5f + 0.5f;
coefs[2] = std::sqrt(coefs[2]);
/* Back Right */
coefs[3] = backPan * 0.5f + 0.5f;
coefs[3] *= totalSpan * 0.5f + 0.5f;
coefs[3] = std::sqrt(coefs[3]);
break;
@@ -1009,22 +1013,27 @@ void Voice::_panLaw(float coefs[8], float frontPan, float backPan, float totalSp
/* Left */
coefs[0] = (frontPan <= 0.f) ? -frontPan : 0.f;
coefs[0] *= -totalSpan * 0.5f + 0.5f;
coefs[0] = std::sqrt(coefs[0]);
/* Right */
coefs[1] = (frontPan >= 0.f) ? frontPan : 0.f;
coefs[1] *= -totalSpan * 0.5f + 0.5f;
coefs[1] = std::sqrt(coefs[1]);
/* Back Left */
coefs[2] = -backPan * 0.5f + 0.5f;
coefs[2] *= totalSpan * 0.5f + 0.5f;
coefs[2] = std::sqrt(coefs[2]);
/* Back Right */
coefs[3] = backPan * 0.5f + 0.5f;
coefs[3] *= totalSpan * 0.5f + 0.5f;
coefs[3] = std::sqrt(coefs[3]);
/* Center */
coefs[4] = 1.f - std::fabs(frontPan);
coefs[4] *= -totalSpan * 0.5f + 0.5f;
coefs[4] = std::sqrt(coefs[4]);
/* LFE */
coefs[5] = 0.25f;
@@ -1035,22 +1044,27 @@ void Voice::_panLaw(float coefs[8], float frontPan, float backPan, float totalSp
/* Left */
coefs[0] = (frontPan <= 0.f) ? -frontPan : 0.f;
coefs[0] *= (totalSpan <= 0.f) ? -totalSpan : 0.f;
coefs[0] = std::sqrt(coefs[0]);
/* Right */
coefs[1] = (frontPan >= 0.f) ? frontPan : 0.f;
coefs[1] *= (totalSpan <= 0.f) ? -totalSpan : 0.f;
coefs[1] = std::sqrt(coefs[1]);
/* Back Left */
coefs[2] = -backPan * 0.5f + 0.5f;
coefs[2] *= (totalSpan >= 0.f) ? totalSpan : 0.f;
coefs[2] = std::sqrt(coefs[2]);
/* Back Right */
coefs[3] = backPan * 0.5f + 0.5f;
coefs[3] *= (totalSpan >= 0.f) ? totalSpan : 0.f;
coefs[3] = std::sqrt(coefs[3]);
/* Center */
coefs[4] = 1.f - std::fabs(frontPan);
coefs[4] *= (totalSpan <= 0.f) ? -totalSpan : 0.f;
coefs[4] = std::sqrt(coefs[4]);
/* LFE */
coefs[5] = 0.25f;
@@ -1058,10 +1072,12 @@ void Voice::_panLaw(float coefs[8], float frontPan, float backPan, float totalSp
/* Side Left */
coefs[6] = -backPan * 0.5f + 0.5f;
coefs[6] *= 1.f - std::fabs(totalSpan);
coefs[6] = std::sqrt(coefs[6]);
/* Side Right */
coefs[7] = backPan * 0.5f + 0.5f;
coefs[7] *= 1.f - std::fabs(totalSpan);
coefs[7] = std::sqrt(coefs[7]);
break;
}