diff options
Diffstat (limited to 'alc/panning.cpp')
| -rw-r--r-- | alc/panning.cpp | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/alc/panning.cpp b/alc/panning.cpp index 39f4f4c3..ce6ba29c 100644 --- a/alc/panning.cpp +++ b/alc/panning.cpp @@ -1090,113 +1090,3 @@ void aluInitEffectPanning(EffectSlot *slot, ALCcontext *context) std::fill(iter, slot->Wet.AmbiMap.end(), BFChannelConfig{}); slot->Wet.Buffer = wetbuffer->mBuffer; } - - -std::array<float,MaxAmbiChannels> CalcAmbiCoeffs(const float y, const float z, const float x, - const float spread) -{ - std::array<float,MaxAmbiChannels> coeffs; - - /* Zeroth-order */ - coeffs[0] = 1.0f; /* ACN 0 = 1 */ - /* First-order */ - coeffs[1] = 1.732050808f * y; /* ACN 1 = sqrt(3) * Y */ - coeffs[2] = 1.732050808f * z; /* ACN 2 = sqrt(3) * Z */ - coeffs[3] = 1.732050808f * x; /* ACN 3 = sqrt(3) * X */ - /* Second-order */ - const float xx{x*x}, yy{y*y}, zz{z*z}, xy{x*y}, yz{y*z}, xz{x*z}; - coeffs[4] = 3.872983346f * xy; /* ACN 4 = sqrt(15) * X * Y */ - coeffs[5] = 3.872983346f * yz; /* ACN 5 = sqrt(15) * Y * Z */ - coeffs[6] = 1.118033989f * (3.0f*zz - 1.0f); /* ACN 6 = sqrt(5)/2 * (3*Z*Z - 1) */ - coeffs[7] = 3.872983346f * xz; /* ACN 7 = sqrt(15) * X * Z */ - coeffs[8] = 1.936491673f * (xx - yy); /* ACN 8 = sqrt(15)/2 * (X*X - Y*Y) */ - /* Third-order */ - coeffs[9] = 2.091650066f * (y*(3.0f*xx - yy)); /* ACN 9 = sqrt(35/8) * Y * (3*X*X - Y*Y) */ - coeffs[10] = 10.246950766f * (z*xy); /* ACN 10 = sqrt(105) * Z * X * Y */ - coeffs[11] = 1.620185175f * (y*(5.0f*zz - 1.0f)); /* ACN 11 = sqrt(21/8) * Y * (5*Z*Z - 1) */ - coeffs[12] = 1.322875656f * (z*(5.0f*zz - 3.0f)); /* ACN 12 = sqrt(7)/2 * Z * (5*Z*Z - 3) */ - coeffs[13] = 1.620185175f * (x*(5.0f*zz - 1.0f)); /* ACN 13 = sqrt(21/8) * X * (5*Z*Z - 1) */ - coeffs[14] = 5.123475383f * (z*(xx - yy)); /* ACN 14 = sqrt(105)/2 * Z * (X*X - Y*Y) */ - coeffs[15] = 2.091650066f * (x*(xx - 3.0f*yy)); /* ACN 15 = sqrt(35/8) * X * (X*X - 3*Y*Y) */ - /* Fourth-order */ - /* ACN 16 = sqrt(35)*3/2 * X * Y * (X*X - Y*Y) */ - /* ACN 17 = sqrt(35/2)*3/2 * (3*X*X - Y*Y) * Y * Z */ - /* ACN 18 = sqrt(5)*3/2 * X * Y * (7*Z*Z - 1) */ - /* ACN 19 = sqrt(5/2)*3/2 * Y * Z * (7*Z*Z - 3) */ - /* ACN 20 = 3/8 * (35*Z*Z*Z*Z - 30*Z*Z + 3) */ - /* ACN 21 = sqrt(5/2)*3/2 * X * Z * (7*Z*Z - 3) */ - /* ACN 22 = sqrt(5)*3/4 * (X*X - Y*Y) * (7*Z*Z - 1) */ - /* ACN 23 = sqrt(35/2)*3/2 * (X*X - 3*Y*Y) * X * Z */ - /* ACN 24 = sqrt(35)*3/8 * (X*X*X*X - 6*X*X*Y*Y + Y*Y*Y*Y) */ - - if(spread > 0.0f) - { - /* Implement the spread by using a spherical source that subtends the - * angle spread. See: - * http://www.ppsloan.org/publications/StupidSH36.pdf - Appendix A3 - * - * When adjusted for N3D normalization instead of SN3D, these - * calculations are: - * - * ZH0 = -sqrt(pi) * (-1+ca); - * ZH1 = 0.5*sqrt(pi) * sa*sa; - * ZH2 = -0.5*sqrt(pi) * ca*(-1+ca)*(ca+1); - * ZH3 = -0.125*sqrt(pi) * (-1+ca)*(ca+1)*(5*ca*ca - 1); - * ZH4 = -0.125*sqrt(pi) * ca*(-1+ca)*(ca+1)*(7*ca*ca - 3); - * ZH5 = -0.0625*sqrt(pi) * (-1+ca)*(ca+1)*(21*ca*ca*ca*ca - 14*ca*ca + 1); - * - * The gain of the source is compensated for size, so that the - * loudness doesn't depend on the spread. Thus: - * - * ZH0 = 1.0f; - * ZH1 = 0.5f * (ca+1.0f); - * ZH2 = 0.5f * (ca+1.0f)*ca; - * ZH3 = 0.125f * (ca+1.0f)*(5.0f*ca*ca - 1.0f); - * ZH4 = 0.125f * (ca+1.0f)*(7.0f*ca*ca - 3.0f)*ca; - * ZH5 = 0.0625f * (ca+1.0f)*(21.0f*ca*ca*ca*ca - 14.0f*ca*ca + 1.0f); - */ - const float ca{std::cos(spread * 0.5f)}; - /* Increase the source volume by up to +3dB for a full spread. */ - const float scale{std::sqrt(1.0f + spread/al::MathDefs<float>::Tau())}; - - const float ZH0_norm{scale}; - const float ZH1_norm{scale * 0.5f * (ca+1.f)}; - const float ZH2_norm{scale * 0.5f * (ca+1.f)*ca}; - const float ZH3_norm{scale * 0.125f * (ca+1.f)*(5.f*ca*ca-1.f)}; - - /* Zeroth-order */ - coeffs[0] *= ZH0_norm; - /* First-order */ - coeffs[1] *= ZH1_norm; - coeffs[2] *= ZH1_norm; - coeffs[3] *= ZH1_norm; - /* Second-order */ - coeffs[4] *= ZH2_norm; - coeffs[5] *= ZH2_norm; - coeffs[6] *= ZH2_norm; - coeffs[7] *= ZH2_norm; - coeffs[8] *= ZH2_norm; - /* Third-order */ - coeffs[9] *= ZH3_norm; - coeffs[10] *= ZH3_norm; - coeffs[11] *= ZH3_norm; - coeffs[12] *= ZH3_norm; - coeffs[13] *= ZH3_norm; - coeffs[14] *= ZH3_norm; - coeffs[15] *= ZH3_norm; - } - - return coeffs; -} - -void ComputePanGains(const MixParams *mix, const float*RESTRICT coeffs, const float ingain, - const al::span<float,MAX_OUTPUT_CHANNELS> gains) -{ - auto ambimap = mix->AmbiMap.cbegin(); - - auto iter = std::transform(ambimap, ambimap+mix->Buffer.size(), gains.begin(), - [coeffs,ingain](const BFChannelConfig &chanmap) noexcept -> float - { return chanmap.Scale * coeffs[chanmap.Index] * ingain; } - ); - std::fill(iter, gains.end(), 0.0f); -} |