113 lines
3.6 KiB
C++
113 lines
3.6 KiB
C++
#ifndef MIXER_HRTFBASE_H
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#define MIXER_HRTFBASE_H
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#include <algorithm>
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#include "alu.h"
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#include "../hrtf.h"
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#include "opthelpers.h"
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#include "voice.h"
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using ApplyCoeffsT = void(&)(float2 *RESTRICT Values, const ALuint irSize, const HrirArray &Coeffs,
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const float left, const float right);
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template<ApplyCoeffsT ApplyCoeffs>
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inline void MixHrtfBase(const float *InSamples, float2 *RESTRICT AccumSamples, const ALuint IrSize,
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const MixHrtfFilter *hrtfparams, const size_t BufferSize)
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{
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ASSUME(BufferSize > 0);
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const HrirArray &Coeffs = *hrtfparams->Coeffs;
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const float gainstep{hrtfparams->GainStep};
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const float gain{hrtfparams->Gain};
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size_t Delay[2]{
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HRTF_HISTORY_LENGTH - hrtfparams->Delay[0],
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HRTF_HISTORY_LENGTH - hrtfparams->Delay[1] };
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float stepcount{0.0f};
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for(size_t i{0u};i < BufferSize;++i)
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{
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const float g{gain + gainstep*stepcount};
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const float left{InSamples[Delay[0]++] * g};
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const float right{InSamples[Delay[1]++] * g};
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ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, left, right);
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stepcount += 1.0f;
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}
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}
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template<ApplyCoeffsT ApplyCoeffs>
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inline void MixHrtfBlendBase(const float *InSamples, float2 *RESTRICT AccumSamples,
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const ALuint IrSize, const HrtfFilter *oldparams, const MixHrtfFilter *newparams,
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const size_t BufferSize)
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{
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const auto &OldCoeffs = oldparams->Coeffs;
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const float oldGain{oldparams->Gain};
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const float oldGainStep{-oldGain / static_cast<float>(BufferSize)};
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const auto &NewCoeffs = *newparams->Coeffs;
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const float newGainStep{newparams->GainStep};
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ASSUME(BufferSize > 0);
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size_t Delay[2]{
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HRTF_HISTORY_LENGTH - oldparams->Delay[0],
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HRTF_HISTORY_LENGTH - oldparams->Delay[1] };
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float stepcount{0.0f};
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for(size_t i{0u};i < BufferSize;++i)
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{
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const float g{oldGain + oldGainStep*stepcount};
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const float left{InSamples[Delay[0]++] * g};
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const float right{InSamples[Delay[1]++] * g};
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ApplyCoeffs(AccumSamples+i, IrSize, OldCoeffs, left, right);
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stepcount += 1.0f;
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}
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Delay[0] = HRTF_HISTORY_LENGTH - newparams->Delay[0];
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Delay[1] = HRTF_HISTORY_LENGTH - newparams->Delay[1];
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stepcount = 0.0f;
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for(size_t i{0u};i < BufferSize;++i)
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{
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const float g{newGainStep*stepcount};
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const float left{InSamples[Delay[0]++] * g};
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const float right{InSamples[Delay[1]++] * g};
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ApplyCoeffs(AccumSamples+i, IrSize, NewCoeffs, left, right);
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stepcount += 1.0f;
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}
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}
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template<ApplyCoeffsT ApplyCoeffs>
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inline void MixDirectHrtfBase(FloatBufferLine &LeftOut, FloatBufferLine &RightOut,
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const al::span<const FloatBufferLine> InSamples, float2 *RESTRICT AccumSamples,
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DirectHrtfState *State, const size_t BufferSize)
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{
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ASSUME(BufferSize > 0);
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const ALuint IrSize{State->IrSize};
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auto coeff_iter = State->Coeffs.begin();
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for(const FloatBufferLine &input : InSamples)
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{
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const auto &Coeffs = *(coeff_iter++);
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for(size_t i{0u};i < BufferSize;++i)
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{
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const float insample{input[i]};
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ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, insample, insample);
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}
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}
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for(size_t i{0u};i < BufferSize;++i)
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LeftOut[i] += AccumSamples[i][0];
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for(size_t i{0u};i < BufferSize;++i)
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RightOut[i] += AccumSamples[i][1];
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/* Copy the new in-progress accumulation values to the front and clear the
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* following samples for the next mix.
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*/
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auto accum_iter = std::copy_n(AccumSamples+BufferSize, HRIR_LENGTH, AccumSamples);
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std::fill_n(accum_iter, BufferSize, float2{});
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}
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#endif /* MIXER_HRTFBASE_H */
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