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Fix W input mixing when non-0 coverage

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When upsampling certain ambisonic formats, the W channel may contribute to
other output channels even with full coverage. Make sure they're taken into
account.
This commit is contained in:
Chris Robinson 2022-08-26 00:11:50 -07:00
parent e48c294a69
commit 1ee81ab3f0
1 changed files with 27 additions and 17 deletions
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44
alc/alu.cpp
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@ -859,22 +859,27 @@ void CalcPanningAndFilters(Voice *voice, const float xpos, const float ypos, con
*/
return CalcAngleCoeffs(ScaleAzimuthFront(az, 1.5f), ev, 0.0f);
};
auto coeffs = calc_coeffs(Device->mRenderMode);
std::transform(coeffs.begin()+1, coeffs.end(), coeffs.begin()+1,
std::bind(std::multiplies<float>{}, _1, 1.0f-coverage));
/* NOTE: W needs to be scaled according to channel scaling. */
auto&& scales = GetAmbiScales(voice->mAmbiScaling);
ComputePanGains(&Device->Dry, coeffs.data(), DryGain.Base*scales[0],
voice->mChans[0].mDryParams.Gains.Target);
for(uint i{0};i < NumSends;i++)
{
if(const EffectSlot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs.data(), WetGain[i].Base*scales[0],
voice->mChans[0].mWetParams[i].Gains.Target);
}
auto coeffs = calc_coeffs(Device->mRenderMode);
/* Scale the panned W signal based on the coverage (full coverage means
* no panned signal). Scale the panned W signal according to channel
* scaling.
*/
std::transform(coeffs.begin(), coeffs.end(), coeffs.begin(),
std::bind(std::multiplies<float>{}, _1, (1.0f-coverage)*scales[0]));
if(coverage > 0.0f)
if(!(coverage > 0.0f))
{
ComputePanGains(&Device->Dry, coeffs.data(), DryGain.Base,
voice->mChans[0].mDryParams.Gains.Target);
for(uint i{0};i < NumSends;i++)
{
if(const EffectSlot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs.data(), WetGain[i].Base*scales[0],
voice->mChans[0].mWetParams[i].Gains.Target);
}
}
else
{
/* Local B-Format sources have their XYZ channels rotated according
* to the orientation.
@ -945,15 +950,18 @@ void CalcPanningAndFilters(Voice *voice, const float xpos, const float ypos, con
GetAmbiLayout(voice->mAmbiLayout).data()};
static const uint8_t OrderOffset[MaxAmbiOrder+1]{0, 1, 4, 9,};
for(size_t c{1};c < num_channels;c++)
for(size_t c{0};c < num_channels;c++)
{
const size_t acn{index_map[c]};
const size_t order{AmbiIndex::OrderFromChannel()[acn]};
const float scale{scales[acn] * coverage};
coeffs = std::array<float,MaxAmbiChannels>{};
/* For channel 0, combine the B-Format signal (scaled according
* to the coverage amount) with the directional pan. For all
* other channels, use just the (scaled) B-Format signal.
*/
for(size_t x{OrderOffset[order]};x < MaxAmbiChannels;++x)
coeffs[x] = shrot[x][acn] * scale;
coeffs[x] += shrot[x][acn] * scale;
ComputePanGains(&Device->Dry, coeffs.data(), DryGain.Base,
voice->mChans[c].mDryParams.Gains.Target);
@ -964,6 +972,8 @@ void CalcPanningAndFilters(Voice *voice, const float xpos, const float ypos, con
ComputePanGains(&Slot->Wet, coeffs.data(), WetGain[i].Base,
voice->mChans[c].mWetParams[i].Gains.Target);
}
coeffs = std::array<float,MaxAmbiChannels>{};
}
}
}