First Commit

externals/openal-soft/core/mixer/defs.h

@@ -0,0 +1,109 @@
+#ifndef CORE_MIXER_DEFS_H
+#define CORE_MIXER_DEFS_H
+
+#include <array>
+#include <stdlib.h>
+
+#include "alspan.h"
+#include "core/bufferline.h"
+#include "core/resampler_limits.h"
+
+struct CubicCoefficients;
+struct HrtfChannelState;
+struct HrtfFilter;
+struct MixHrtfFilter;
+
+using uint = unsigned int;
+using float2 = std::array<float,2>;
+
+
+constexpr int MixerFracBits{16};
+constexpr int MixerFracOne{1 << MixerFracBits};
+constexpr int MixerFracMask{MixerFracOne - 1};
+constexpr int MixerFracHalf{MixerFracOne >> 1};
+
+constexpr float GainSilenceThreshold{0.00001f}; /* -100dB */
+
+
+enum class Resampler : uint8_t {
+    Point,
+    Linear,
+    Cubic,
+    FastBSinc12,
+    BSinc12,
+    FastBSinc24,
+    BSinc24,
+
+    Max = BSinc24
+};
+
+/* Interpolator state. Kind of a misnomer since the interpolator itself is
+ * stateless. This just keeps it from having to recompute scale-related
+ * mappings for every sample.
+ */
+struct BsincState {
+    float sf; /* Scale interpolation factor. */
+    uint m; /* Coefficient count. */
+    uint l; /* Left coefficient offset. */
+    /* Filter coefficients, followed by the phase, scale, and scale-phase
+     * delta coefficients. Starting at phase index 0, each subsequent phase
+     * index follows contiguously.
+     */
+    const float *filter;
+};
+
+struct CubicState {
+    /* Filter coefficients, and coefficient deltas. Starting at phase index 0,
+     * each subsequent phase index follows contiguously.
+     */
+    const CubicCoefficients *filter;
+};
+
+union InterpState {
+    CubicState cubic;
+    BsincState bsinc;
+};
+
+using ResamplerFunc = void(*)(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst);
+
+ResamplerFunc PrepareResampler(Resampler resampler, uint increment, InterpState *state);
+
+
+template<typename TypeTag, typename InstTag>
+void Resample_(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst);
+
+template<typename InstTag>
+void Mix_(const al::span<const float> InSamples, const al::span<FloatBufferLine> OutBuffer,
+    float *CurrentGains, const float *TargetGains, const size_t Counter, const size_t OutPos);
+template<typename InstTag>
+void Mix_(const al::span<const float> InSamples, float *OutBuffer, float &CurrentGain,
+    const float TargetGain, const size_t Counter);
+
+template<typename InstTag>
+void MixHrtf_(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize);
+template<typename InstTag>
+void MixHrtfBlend_(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize);
+template<typename InstTag>
+void MixDirectHrtf_(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
+    const al::span<const FloatBufferLine> InSamples, float2 *AccumSamples,
+    float *TempBuf, HrtfChannelState *ChanState, const size_t IrSize, const size_t BufferSize);
+
+/* Vectorized resampler helpers */
+template<size_t N>
+inline void InitPosArrays(uint frac, uint increment, uint (&frac_arr)[N], uint (&pos_arr)[N])
+{
+    pos_arr[0] = 0;
+    frac_arr[0] = frac;
+    for(size_t i{1};i < N;i++)
+    {
+        const uint frac_tmp{frac_arr[i-1] + increment};
+        pos_arr[i] = pos_arr[i-1] + (frac_tmp>>MixerFracBits);
+        frac_arr[i] = frac_tmp&MixerFracMask;
+    }
+}
+
+#endif /* CORE_MIXER_DEFS_H */

externals/openal-soft/core/mixer/hrtfbase.h

@@ -0,0 +1,129 @@
+#ifndef CORE_MIXER_HRTFBASE_H
+#define CORE_MIXER_HRTFBASE_H
+
+#include <algorithm>
+#include <cmath>
+
+#include "almalloc.h"
+#include "hrtfdefs.h"
+#include "opthelpers.h"
+
+
+using uint = unsigned int;
+
+using ApplyCoeffsT = void(&)(float2 *RESTRICT Values, const size_t irSize,
+    const ConstHrirSpan Coeffs, const float left, const float right);
+
+template<ApplyCoeffsT ApplyCoeffs>
+inline void MixHrtfBase(const float *InSamples, float2 *RESTRICT AccumSamples, const size_t IrSize,
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
+{
+    ASSUME(BufferSize > 0);
+
+    const ConstHrirSpan Coeffs{hrtfparams->Coeffs};
+    const float gainstep{hrtfparams->GainStep};
+    const float gain{hrtfparams->Gain};
+
+    size_t ldelay{HrtfHistoryLength - hrtfparams->Delay[0]};
+    size_t rdelay{HrtfHistoryLength - hrtfparams->Delay[1]};
+    float stepcount{0.0f};
+    for(size_t i{0u};i < BufferSize;++i)
+    {
+        const float g{gain + gainstep*stepcount};
+        const float left{InSamples[ldelay++] * g};
+        const float right{InSamples[rdelay++] * g};
+        ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, left, right);
+
+        stepcount += 1.0f;
+    }
+}
+
+template<ApplyCoeffsT ApplyCoeffs>
+inline void MixHrtfBlendBase(const float *InSamples, float2 *RESTRICT AccumSamples,
+    const size_t IrSize, const HrtfFilter *oldparams, const MixHrtfFilter *newparams,
+    const size_t BufferSize)
+{
+    ASSUME(BufferSize > 0);
+
+    const ConstHrirSpan OldCoeffs{oldparams->Coeffs};
+    const float oldGainStep{oldparams->Gain / static_cast<float>(BufferSize)};
+    const ConstHrirSpan NewCoeffs{newparams->Coeffs};
+    const float newGainStep{newparams->GainStep};
+
+    if(oldparams->Gain > GainSilenceThreshold) LIKELY
+    {
+        size_t ldelay{HrtfHistoryLength - oldparams->Delay[0]};
+        size_t rdelay{HrtfHistoryLength - oldparams->Delay[1]};
+        auto stepcount = static_cast<float>(BufferSize);
+        for(size_t i{0u};i < BufferSize;++i)
+        {
+            const float g{oldGainStep*stepcount};
+            const float left{InSamples[ldelay++] * g};
+            const float right{InSamples[rdelay++] * g};
+            ApplyCoeffs(AccumSamples+i, IrSize, OldCoeffs, left, right);
+
+            stepcount -= 1.0f;
+        }
+    }
+
+    if(newGainStep*static_cast<float>(BufferSize) > GainSilenceThreshold) LIKELY
+    {
+        size_t ldelay{HrtfHistoryLength+1 - newparams->Delay[0]};
+        size_t rdelay{HrtfHistoryLength+1 - newparams->Delay[1]};
+        float stepcount{1.0f};
+        for(size_t i{1u};i < BufferSize;++i)
+        {
+            const float g{newGainStep*stepcount};
+            const float left{InSamples[ldelay++] * g};
+            const float right{InSamples[rdelay++] * g};
+            ApplyCoeffs(AccumSamples+i, IrSize, NewCoeffs, left, right);
+
+            stepcount += 1.0f;
+        }
+    }
+}
+
+template<ApplyCoeffsT ApplyCoeffs>
+inline void MixDirectHrtfBase(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
+    const al::span<const FloatBufferLine> InSamples, float2 *RESTRICT AccumSamples,
+    float *TempBuf, HrtfChannelState *ChanState, const size_t IrSize, const size_t BufferSize)
+{
+    ASSUME(BufferSize > 0);
+
+    for(const FloatBufferLine &input : InSamples)
+    {
+        /* For dual-band processing, the signal needs extra scaling applied to
+         * the high frequency response. The band-splitter applies this scaling
+         * with a consistent phase shift regardless of the scale amount.
+         */
+        ChanState->mSplitter.processHfScale({input.data(), BufferSize}, TempBuf,
+            ChanState->mHfScale);
+
+        /* Now apply the HRIR coefficients to this channel. */
+        const float *RESTRICT tempbuf{al::assume_aligned<16>(TempBuf)};
+        const ConstHrirSpan Coeffs{ChanState->mCoeffs};
+        for(size_t i{0u};i < BufferSize;++i)
+        {
+            const float insample{tempbuf[i]};
+            ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, insample, insample);
+        }
+
+        ++ChanState;
+    }
+
+    /* Add the HRTF signal to the existing "direct" signal. */
+    float *RESTRICT left{al::assume_aligned<16>(LeftOut.data())};
+    float *RESTRICT right{al::assume_aligned<16>(RightOut.data())};
+    for(size_t i{0u};i < BufferSize;++i)
+        left[i]  += AccumSamples[i][0];
+    for(size_t i{0u};i < BufferSize;++i)
+        right[i] += AccumSamples[i][1];
+
+    /* Copy the new in-progress accumulation values to the front and clear the
+     * following samples for the next mix.
+     */
+    auto accum_iter = std::copy_n(AccumSamples+BufferSize, HrirLength, AccumSamples);
+    std::fill_n(accum_iter, BufferSize, float2{});
+}
+
+#endif /* CORE_MIXER_HRTFBASE_H */

externals/openal-soft/core/mixer/hrtfdefs.h

@@ -0,0 +1,53 @@
+#ifndef CORE_MIXER_HRTFDEFS_H
+#define CORE_MIXER_HRTFDEFS_H
+
+#include <array>
+
+#include "alspan.h"
+#include "core/ambidefs.h"
+#include "core/bufferline.h"
+#include "core/filters/splitter.h"
+
+
+using float2 = std::array<float,2>;
+using ubyte = unsigned char;
+using ubyte2 = std::array<ubyte,2>;
+using ushort = unsigned short;
+using uint = unsigned int;
+using uint2 = std::array<uint,2>;
+
+constexpr uint HrtfHistoryBits{6};
+constexpr uint HrtfHistoryLength{1 << HrtfHistoryBits};
+constexpr uint HrtfHistoryMask{HrtfHistoryLength - 1};
+
+constexpr uint HrirBits{7};
+constexpr uint HrirLength{1 << HrirBits};
+constexpr uint HrirMask{HrirLength - 1};
+
+constexpr uint MinIrLength{8};
+
+using HrirArray = std::array<float2,HrirLength>;
+using HrirSpan = al::span<float2,HrirLength>;
+using ConstHrirSpan = al::span<const float2,HrirLength>;
+
+struct MixHrtfFilter {
+    const ConstHrirSpan Coeffs;
+    uint2 Delay;
+    float Gain;
+    float GainStep;
+};
+
+struct HrtfFilter {
+    alignas(16) HrirArray Coeffs;
+    uint2 Delay;
+    float Gain;
+};
+
+
+struct HrtfChannelState {
+    BandSplitter mSplitter;
+    float mHfScale{};
+    alignas(16) HrirArray mCoeffs{};
+};
+
+#endif /* CORE_MIXER_HRTFDEFS_H */

externals/openal-soft/core/mixer/mixer_c.cpp

@@ -0,0 +1,218 @@
+#include "config.h"
+
+#include <cassert>
+#include <cmath>
+#include <limits>
+
+#include "alnumeric.h"
+#include "core/bsinc_defs.h"
+#include "core/cubic_defs.h"
+#include "defs.h"
+#include "hrtfbase.h"
+
+struct CTag;
+struct PointTag;
+struct LerpTag;
+struct CubicTag;
+struct BSincTag;
+struct FastBSincTag;
+
+
+namespace {
+
+constexpr uint BsincPhaseDiffBits{MixerFracBits - BSincPhaseBits};
+constexpr uint BsincPhaseDiffOne{1 << BsincPhaseDiffBits};
+constexpr uint BsincPhaseDiffMask{BsincPhaseDiffOne - 1u};
+
+constexpr uint CubicPhaseDiffBits{MixerFracBits - CubicPhaseBits};
+constexpr uint CubicPhaseDiffOne{1 << CubicPhaseDiffBits};
+constexpr uint CubicPhaseDiffMask{CubicPhaseDiffOne - 1u};
+
+inline float do_point(const InterpState&, const float *RESTRICT vals, const uint)
+{ return vals[0]; }
+inline float do_lerp(const InterpState&, const float *RESTRICT vals, const uint frac)
+{ return lerpf(vals[0], vals[1], static_cast<float>(frac)*(1.0f/MixerFracOne)); }
+inline float do_cubic(const InterpState &istate, const float *RESTRICT vals, const uint frac)
+{
+    /* Calculate the phase index and factor. */
+    const uint pi{frac >> CubicPhaseDiffBits};
+    const float pf{static_cast<float>(frac&CubicPhaseDiffMask) * (1.0f/CubicPhaseDiffOne)};
+
+    const float *RESTRICT fil{al::assume_aligned<16>(istate.cubic.filter[pi].mCoeffs)};
+    const float *RESTRICT phd{al::assume_aligned<16>(istate.cubic.filter[pi].mDeltas)};
+
+    /* Apply the phase interpolated filter. */
+    return (fil[0] + pf*phd[0])*vals[0] + (fil[1] + pf*phd[1])*vals[1]
+        + (fil[2] + pf*phd[2])*vals[2] + (fil[3] + pf*phd[3])*vals[3];
+}
+inline float do_bsinc(const InterpState &istate, const float *RESTRICT vals, const uint frac)
+{
+    const size_t m{istate.bsinc.m};
+    ASSUME(m > 0);
+
+    /* Calculate the phase index and factor. */
+    const uint pi{frac >> BsincPhaseDiffBits};
+    const float pf{static_cast<float>(frac&BsincPhaseDiffMask) * (1.0f/BsincPhaseDiffOne)};
+
+    const float *RESTRICT fil{istate.bsinc.filter + m*pi*2};
+    const float *RESTRICT phd{fil + m};
+    const float *RESTRICT scd{fil + BSincPhaseCount*2*m};
+    const float *RESTRICT spd{scd + m};
+
+    /* Apply the scale and phase interpolated filter. */
+    float r{0.0f};
+    for(size_t j_f{0};j_f < m;j_f++)
+        r += (fil[j_f] + istate.bsinc.sf*scd[j_f] + pf*(phd[j_f] + istate.bsinc.sf*spd[j_f])) * vals[j_f];
+    return r;
+}
+inline float do_fastbsinc(const InterpState &istate, const float *RESTRICT vals, const uint frac)
+{
+    const size_t m{istate.bsinc.m};
+    ASSUME(m > 0);
+
+    /* Calculate the phase index and factor. */
+    const uint pi{frac >> BsincPhaseDiffBits};
+    const float pf{static_cast<float>(frac&BsincPhaseDiffMask) * (1.0f/BsincPhaseDiffOne)};
+
+    const float *RESTRICT fil{istate.bsinc.filter + m*pi*2};
+    const float *RESTRICT phd{fil + m};
+
+    /* Apply the phase interpolated filter. */
+    float r{0.0f};
+    for(size_t j_f{0};j_f < m;j_f++)
+        r += (fil[j_f] + pf*phd[j_f]) * vals[j_f];
+    return r;
+}
+
+using SamplerT = float(&)(const InterpState&, const float*RESTRICT, const uint);
+template<SamplerT Sampler>
+void DoResample(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    const InterpState istate{*state};
+    ASSUME(frac < MixerFracOne);
+    for(float &out : dst)
+    {
+        out = Sampler(istate, src, frac);
+
+        frac += increment;
+        src  += frac>>MixerFracBits;
+        frac &= MixerFracMask;
+    }
+}
+
+inline void ApplyCoeffs(float2 *RESTRICT Values, const size_t IrSize, const ConstHrirSpan Coeffs,
+    const float left, const float right)
+{
+    ASSUME(IrSize >= MinIrLength);
+    for(size_t c{0};c < IrSize;++c)
+    {
+        Values[c][0] += Coeffs[c][0] * left;
+        Values[c][1] += Coeffs[c][1] * right;
+    }
+}
+
+force_inline void MixLine(const al::span<const float> InSamples, float *RESTRICT dst,
+    float &CurrentGain, const float TargetGain, const float delta, const size_t min_len,
+    size_t Counter)
+{
+    float gain{CurrentGain};
+    const float step{(TargetGain-gain) * delta};
+
+    size_t pos{0};
+    if(!(std::abs(step) > std::numeric_limits<float>::epsilon()))
+        gain = TargetGain;
+    else
+    {
+        float step_count{0.0f};
+        for(;pos != min_len;++pos)
+        {
+            dst[pos] += InSamples[pos] * (gain + step*step_count);
+            step_count += 1.0f;
+        }
+        if(pos == Counter)
+            gain = TargetGain;
+        else
+            gain += step*step_count;
+    }
+    CurrentGain = gain;
+
+    if(!(std::abs(gain) > GainSilenceThreshold))
+        return;
+    for(;pos != InSamples.size();++pos)
+        dst[pos] += InSamples[pos] * gain;
+}
+
+} // namespace
+
+template<>
+void Resample_<PointTag,CTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{ DoResample<do_point>(state, src, frac, increment, dst); }
+
+template<>
+void Resample_<LerpTag,CTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{ DoResample<do_lerp>(state, src, frac, increment, dst); }
+
+template<>
+void Resample_<CubicTag,CTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{ DoResample<do_cubic>(state, src-1, frac, increment, dst); }
+
+template<>
+void Resample_<BSincTag,CTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{ DoResample<do_bsinc>(state, src-state->bsinc.l, frac, increment, dst); }
+
+template<>
+void Resample_<FastBSincTag,CTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{ DoResample<do_fastbsinc>(state, src-state->bsinc.l, frac, increment, dst); }
+
+
+template<>
+void MixHrtf_<CTag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
+{ MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, BufferSize); }
+
+template<>
+void MixHrtfBlend_<CTag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize)
+{
+    MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
+        BufferSize);
+}
+
+template<>
+void MixDirectHrtf_<CTag>(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
+    const al::span<const FloatBufferLine> InSamples, float2 *AccumSamples,
+    float *TempBuf, HrtfChannelState *ChanState, const size_t IrSize, const size_t BufferSize)
+{
+    MixDirectHrtfBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, TempBuf, ChanState,
+        IrSize, BufferSize);
+}
+
+
+template<>
+void Mix_<CTag>(const al::span<const float> InSamples, const al::span<FloatBufferLine> OutBuffer,
+    float *CurrentGains, const float *TargetGains, const size_t Counter, const size_t OutPos)
+{
+    const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
+    const auto min_len = minz(Counter, InSamples.size());
+
+    for(FloatBufferLine &output : OutBuffer)
+        MixLine(InSamples, al::assume_aligned<16>(output.data()+OutPos), *CurrentGains++,
+            *TargetGains++, delta, min_len, Counter);
+}
+
+template<>
+void Mix_<CTag>(const al::span<const float> InSamples, float *OutBuffer, float &CurrentGain,
+    const float TargetGain, const size_t Counter)
+{
+    const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
+    const auto min_len = minz(Counter, InSamples.size());
+
+    MixLine(InSamples, al::assume_aligned<16>(OutBuffer), CurrentGain,
+        TargetGain, delta, min_len, Counter);
+}

externals/openal-soft/core/mixer/mixer_neon.cpp

@@ -0,0 +1,362 @@
+#include "config.h"
+
+#include <arm_neon.h>
+
+#include <cmath>
+#include <limits>
+
+#include "alnumeric.h"
+#include "core/bsinc_defs.h"
+#include "core/cubic_defs.h"
+#include "defs.h"
+#include "hrtfbase.h"
+
+struct NEONTag;
+struct LerpTag;
+struct CubicTag;
+struct BSincTag;
+struct FastBSincTag;
+
+
+#if defined(__GNUC__) && !defined(__clang__) && !defined(__ARM_NEON)
+#pragma GCC target("fpu=neon")
+#endif
+
+namespace {
+
+constexpr uint BSincPhaseDiffBits{MixerFracBits - BSincPhaseBits};
+constexpr uint BSincPhaseDiffOne{1 << BSincPhaseDiffBits};
+constexpr uint BSincPhaseDiffMask{BSincPhaseDiffOne - 1u};
+
+constexpr uint CubicPhaseDiffBits{MixerFracBits - CubicPhaseBits};
+constexpr uint CubicPhaseDiffOne{1 << CubicPhaseDiffBits};
+constexpr uint CubicPhaseDiffMask{CubicPhaseDiffOne - 1u};
+
+inline float32x4_t set_f4(float l0, float l1, float l2, float l3)
+{
+    float32x4_t ret{vmovq_n_f32(l0)};
+    ret = vsetq_lane_f32(l1, ret, 1);
+    ret = vsetq_lane_f32(l2, ret, 2);
+    ret = vsetq_lane_f32(l3, ret, 3);
+    return ret;
+}
+
+inline void ApplyCoeffs(float2 *RESTRICT Values, const size_t IrSize, const ConstHrirSpan Coeffs,
+    const float left, const float right)
+{
+    float32x4_t leftright4;
+    {
+        float32x2_t leftright2{vmov_n_f32(left)};
+        leftright2 = vset_lane_f32(right, leftright2, 1);
+        leftright4 = vcombine_f32(leftright2, leftright2);
+    }
+
+    ASSUME(IrSize >= MinIrLength);
+    for(size_t c{0};c < IrSize;c += 2)
+    {
+        float32x4_t vals = vld1q_f32(&Values[c][0]);
+        float32x4_t coefs = vld1q_f32(&Coeffs[c][0]);
+
+        vals = vmlaq_f32(vals, coefs, leftright4);
+
+        vst1q_f32(&Values[c][0], vals);
+    }
+}
+
+force_inline void MixLine(const al::span<const float> InSamples, float *RESTRICT dst,
+    float &CurrentGain, const float TargetGain, const float delta, const size_t min_len,
+    const size_t aligned_len, size_t Counter)
+{
+    float gain{CurrentGain};
+    const float step{(TargetGain-gain) * delta};
+
+    size_t pos{0};
+    if(!(std::abs(step) > std::numeric_limits<float>::epsilon()))
+        gain = TargetGain;
+    else
+    {
+        float step_count{0.0f};
+        /* Mix with applying gain steps in aligned multiples of 4. */
+        if(size_t todo{min_len >> 2})
+        {
+            const float32x4_t four4{vdupq_n_f32(4.0f)};
+            const float32x4_t step4{vdupq_n_f32(step)};
+            const float32x4_t gain4{vdupq_n_f32(gain)};
+            float32x4_t step_count4{vdupq_n_f32(0.0f)};
+            step_count4 = vsetq_lane_f32(1.0f, step_count4, 1);
+            step_count4 = vsetq_lane_f32(2.0f, step_count4, 2);
+            step_count4 = vsetq_lane_f32(3.0f, step_count4, 3);
+
+            do {
+                const float32x4_t val4 = vld1q_f32(&InSamples[pos]);
+                float32x4_t dry4 = vld1q_f32(&dst[pos]);
+                dry4 = vmlaq_f32(dry4, val4, vmlaq_f32(gain4, step4, step_count4));
+                step_count4 = vaddq_f32(step_count4, four4);
+                vst1q_f32(&dst[pos], dry4);
+                pos += 4;
+            } while(--todo);
+            /* NOTE: step_count4 now represents the next four counts after the
+             * last four mixed samples, so the lowest element represents the
+             * next step count to apply.
+             */
+            step_count = vgetq_lane_f32(step_count4, 0);
+        }
+        /* Mix with applying left over gain steps that aren't aligned multiples of 4. */
+        for(size_t leftover{min_len&3};leftover;++pos,--leftover)
+        {
+            dst[pos] += InSamples[pos] * (gain + step*step_count);
+            step_count += 1.0f;
+        }
+        if(pos == Counter)
+            gain = TargetGain;
+        else
+            gain += step*step_count;
+
+        /* Mix until pos is aligned with 4 or the mix is done. */
+        for(size_t leftover{aligned_len&3};leftover;++pos,--leftover)
+            dst[pos] += InSamples[pos] * gain;
+    }
+    CurrentGain = gain;
+
+    if(!(std::abs(gain) > GainSilenceThreshold))
+        return;
+    if(size_t todo{(InSamples.size()-pos) >> 2})
+    {
+        const float32x4_t gain4 = vdupq_n_f32(gain);
+        do {
+            const float32x4_t val4 = vld1q_f32(&InSamples[pos]);
+            float32x4_t dry4 = vld1q_f32(&dst[pos]);
+            dry4 = vmlaq_f32(dry4, val4, gain4);
+            vst1q_f32(&dst[pos], dry4);
+            pos += 4;
+        } while(--todo);
+    }
+    for(size_t leftover{(InSamples.size()-pos)&3};leftover;++pos,--leftover)
+        dst[pos] += InSamples[pos] * gain;
+}
+
+} // namespace
+
+template<>
+void Resample_<LerpTag,NEONTag>(const InterpState*, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    ASSUME(frac < MixerFracOne);
+
+    const int32x4_t increment4 = vdupq_n_s32(static_cast<int>(increment*4));
+    const float32x4_t fracOne4 = vdupq_n_f32(1.0f/MixerFracOne);
+    const int32x4_t fracMask4 = vdupq_n_s32(MixerFracMask);
+    alignas(16) uint pos_[4], frac_[4];
+    int32x4_t pos4, frac4;
+
+    InitPosArrays(frac, increment, frac_, pos_);
+    frac4 = vld1q_s32(reinterpret_cast<int*>(frac_));
+    pos4 = vld1q_s32(reinterpret_cast<int*>(pos_));
+
+    auto dst_iter = dst.begin();
+    for(size_t todo{dst.size()>>2};todo;--todo)
+    {
+        const int pos0{vgetq_lane_s32(pos4, 0)};
+        const int pos1{vgetq_lane_s32(pos4, 1)};
+        const int pos2{vgetq_lane_s32(pos4, 2)};
+        const int pos3{vgetq_lane_s32(pos4, 3)};
+        const float32x4_t val1{set_f4(src[pos0], src[pos1], src[pos2], src[pos3])};
+        const float32x4_t val2{set_f4(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
+
+        /* val1 + (val2-val1)*mu */
+        const float32x4_t r0{vsubq_f32(val2, val1)};
+        const float32x4_t mu{vmulq_f32(vcvtq_f32_s32(frac4), fracOne4)};
+        const float32x4_t out{vmlaq_f32(val1, mu, r0)};
+
+        vst1q_f32(dst_iter, out);
+        dst_iter += 4;
+
+        frac4 = vaddq_s32(frac4, increment4);
+        pos4 = vaddq_s32(pos4, vshrq_n_s32(frac4, MixerFracBits));
+        frac4 = vandq_s32(frac4, fracMask4);
+    }
+
+    if(size_t todo{dst.size()&3})
+    {
+        src += static_cast<uint>(vgetq_lane_s32(pos4, 0));
+        frac = static_cast<uint>(vgetq_lane_s32(frac4, 0));
+
+        do {
+            *(dst_iter++) = lerpf(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
+
+            frac += increment;
+            src  += frac>>MixerFracBits;
+            frac &= MixerFracMask;
+        } while(--todo);
+    }
+}
+
+template<>
+void Resample_<CubicTag,NEONTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    ASSUME(frac < MixerFracOne);
+
+    const CubicCoefficients *RESTRICT filter = al::assume_aligned<16>(state->cubic.filter);
+
+    src -= 1;
+    for(float &out_sample : dst)
+    {
+        const uint pi{frac >> CubicPhaseDiffBits};
+        const float pf{static_cast<float>(frac&CubicPhaseDiffMask) * (1.0f/CubicPhaseDiffOne)};
+        const float32x4_t pf4{vdupq_n_f32(pf)};
+
+        /* Apply the phase interpolated filter. */
+
+        /* f = fil + pf*phd */
+        const float32x4_t f4 = vmlaq_f32(vld1q_f32(filter[pi].mCoeffs), pf4,
+            vld1q_f32(filter[pi].mDeltas));
+        /* r = f*src */
+        float32x4_t r4{vmulq_f32(f4, vld1q_f32(src))};
+
+        r4 = vaddq_f32(r4, vrev64q_f32(r4));
+        out_sample = vget_lane_f32(vadd_f32(vget_low_f32(r4), vget_high_f32(r4)), 0);
+
+        frac += increment;
+        src  += frac>>MixerFracBits;
+        frac &= MixerFracMask;
+    }
+}
+
+template<>
+void Resample_<BSincTag,NEONTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    const float *const filter{state->bsinc.filter};
+    const float32x4_t sf4{vdupq_n_f32(state->bsinc.sf)};
+    const size_t m{state->bsinc.m};
+    ASSUME(m > 0);
+    ASSUME(frac < MixerFracOne);
+
+    src -= state->bsinc.l;
+    for(float &out_sample : dst)
+    {
+        // Calculate the phase index and factor.
+        const uint pi{frac >> BSincPhaseDiffBits};
+        const float pf{static_cast<float>(frac&BSincPhaseDiffMask) * (1.0f/BSincPhaseDiffOne)};
+
+        // Apply the scale and phase interpolated filter.
+        float32x4_t r4{vdupq_n_f32(0.0f)};
+        {
+            const float32x4_t pf4{vdupq_n_f32(pf)};
+            const float *RESTRICT fil{filter + m*pi*2};
+            const float *RESTRICT phd{fil + m};
+            const float *RESTRICT scd{fil + BSincPhaseCount*2*m};
+            const float *RESTRICT spd{scd + m};
+            size_t td{m >> 2};
+            size_t j{0u};
+
+            do {
+                /* f = ((fil + sf*scd) + pf*(phd + sf*spd)) */
+                const float32x4_t f4 = vmlaq_f32(
+                    vmlaq_f32(vld1q_f32(&fil[j]), sf4, vld1q_f32(&scd[j])),
+                    pf4, vmlaq_f32(vld1q_f32(&phd[j]), sf4, vld1q_f32(&spd[j])));
+                /* r += f*src */
+                r4 = vmlaq_f32(r4, f4, vld1q_f32(&src[j]));
+                j += 4;
+            } while(--td);
+        }
+        r4 = vaddq_f32(r4, vrev64q_f32(r4));
+        out_sample = vget_lane_f32(vadd_f32(vget_low_f32(r4), vget_high_f32(r4)), 0);
+
+        frac += increment;
+        src  += frac>>MixerFracBits;
+        frac &= MixerFracMask;
+    }
+}
+
+template<>
+void Resample_<FastBSincTag,NEONTag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    const float *const filter{state->bsinc.filter};
+    const size_t m{state->bsinc.m};
+    ASSUME(m > 0);
+    ASSUME(frac < MixerFracOne);
+
+    src -= state->bsinc.l;
+    for(float &out_sample : dst)
+    {
+        // Calculate the phase index and factor.
+        const uint pi{frac >> BSincPhaseDiffBits};
+        const float pf{static_cast<float>(frac&BSincPhaseDiffMask) * (1.0f/BSincPhaseDiffOne)};
+
+        // Apply the phase interpolated filter.
+        float32x4_t r4{vdupq_n_f32(0.0f)};
+        {
+            const float32x4_t pf4{vdupq_n_f32(pf)};
+            const float *RESTRICT fil{filter + m*pi*2};
+            const float *RESTRICT phd{fil + m};
+            size_t td{m >> 2};
+            size_t j{0u};
+
+            do {
+                /* f = fil + pf*phd */
+                const float32x4_t f4 = vmlaq_f32(vld1q_f32(&fil[j]), pf4, vld1q_f32(&phd[j]));
+                /* r += f*src */
+                r4 = vmlaq_f32(r4, f4, vld1q_f32(&src[j]));
+                j += 4;
+            } while(--td);
+        }
+        r4 = vaddq_f32(r4, vrev64q_f32(r4));
+        out_sample = vget_lane_f32(vadd_f32(vget_low_f32(r4), vget_high_f32(r4)), 0);
+
+        frac += increment;
+        src  += frac>>MixerFracBits;
+        frac &= MixerFracMask;
+    }
+}
+
+
+template<>
+void MixHrtf_<NEONTag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
+{ MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, BufferSize); }
+
+template<>
+void MixHrtfBlend_<NEONTag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize)
+{
+    MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
+        BufferSize);
+}
+
+template<>
+void MixDirectHrtf_<NEONTag>(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
+    const al::span<const FloatBufferLine> InSamples, float2 *AccumSamples,
+    float *TempBuf, HrtfChannelState *ChanState, const size_t IrSize, const size_t BufferSize)
+{
+    MixDirectHrtfBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, TempBuf, ChanState,
+        IrSize, BufferSize);
+}
+
+
+template<>
+void Mix_<NEONTag>(const al::span<const float> InSamples, const al::span<FloatBufferLine> OutBuffer,
+    float *CurrentGains, const float *TargetGains, const size_t Counter, const size_t OutPos)
+{
+    const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
+    const auto min_len = minz(Counter, InSamples.size());
+    const auto aligned_len = minz((min_len+3) & ~size_t{3}, InSamples.size()) - min_len;
+
+    for(FloatBufferLine &output : OutBuffer)
+        MixLine(InSamples, al::assume_aligned<16>(output.data()+OutPos), *CurrentGains++,
+            *TargetGains++, delta, min_len, aligned_len, Counter);
+}
+
+template<>
+void Mix_<NEONTag>(const al::span<const float> InSamples, float *OutBuffer, float &CurrentGain,
+    const float TargetGain, const size_t Counter)
+{
+    const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
+    const auto min_len = minz(Counter, InSamples.size());
+    const auto aligned_len = minz((min_len+3) & ~size_t{3}, InSamples.size()) - min_len;
+
+    MixLine(InSamples, al::assume_aligned<16>(OutBuffer), CurrentGain, TargetGain, delta, min_len,
+        aligned_len, Counter);
+}

externals/openal-soft/core/mixer/mixer_sse.cpp

@@ -0,0 +1,327 @@
+#include "config.h"
+
+#include <xmmintrin.h>
+
+#include <cmath>
+#include <limits>
+
+#include "alnumeric.h"
+#include "core/bsinc_defs.h"
+#include "core/cubic_defs.h"
+#include "defs.h"
+#include "hrtfbase.h"
+
+struct SSETag;
+struct CubicTag;
+struct BSincTag;
+struct FastBSincTag;
+
+
+#if defined(__GNUC__) && !defined(__clang__) && !defined(__SSE__)
+#pragma GCC target("sse")
+#endif
+
+namespace {
+
+constexpr uint BSincPhaseDiffBits{MixerFracBits - BSincPhaseBits};
+constexpr uint BSincPhaseDiffOne{1 << BSincPhaseDiffBits};
+constexpr uint BSincPhaseDiffMask{BSincPhaseDiffOne - 1u};
+
+constexpr uint CubicPhaseDiffBits{MixerFracBits - CubicPhaseBits};
+constexpr uint CubicPhaseDiffOne{1 << CubicPhaseDiffBits};
+constexpr uint CubicPhaseDiffMask{CubicPhaseDiffOne - 1u};
+
+#define MLA4(x, y, z) _mm_add_ps(x, _mm_mul_ps(y, z))
+
+inline void ApplyCoeffs(float2 *RESTRICT Values, const size_t IrSize, const ConstHrirSpan Coeffs,
+    const float left, const float right)
+{
+    const __m128 lrlr{_mm_setr_ps(left, right, left, right)};
+
+    ASSUME(IrSize >= MinIrLength);
+    /* This isn't technically correct to test alignment, but it's true for
+     * systems that support SSE, which is the only one that needs to know the
+     * alignment of Values (which alternates between 8- and 16-byte aligned).
+     */
+    if(!(reinterpret_cast<uintptr_t>(Values)&15))
+    {
+        for(size_t i{0};i < IrSize;i += 2)
+        {
+            const __m128 coeffs{_mm_load_ps(Coeffs[i].data())};
+            __m128 vals{_mm_load_ps(Values[i].data())};
+            vals = MLA4(vals, lrlr, coeffs);
+            _mm_store_ps(Values[i].data(), vals);
+        }
+    }
+    else
+    {
+        __m128 imp0, imp1;
+        __m128 coeffs{_mm_load_ps(Coeffs[0].data())};
+        __m128 vals{_mm_loadl_pi(_mm_setzero_ps(), reinterpret_cast<__m64*>(Values[0].data()))};
+        imp0 = _mm_mul_ps(lrlr, coeffs);
+        vals = _mm_add_ps(imp0, vals);
+        _mm_storel_pi(reinterpret_cast<__m64*>(Values[0].data()), vals);
+        size_t td{((IrSize+1)>>1) - 1};
+        size_t i{1};
+        do {
+            coeffs = _mm_load_ps(Coeffs[i+1].data());
+            vals = _mm_load_ps(Values[i].data());
+            imp1 = _mm_mul_ps(lrlr, coeffs);
+            imp0 = _mm_shuffle_ps(imp0, imp1, _MM_SHUFFLE(1, 0, 3, 2));
+            vals = _mm_add_ps(imp0, vals);
+            _mm_store_ps(Values[i].data(), vals);
+            imp0 = imp1;
+            i += 2;
+        } while(--td);
+        vals = _mm_loadl_pi(vals, reinterpret_cast<__m64*>(Values[i].data()));
+        imp0 = _mm_movehl_ps(imp0, imp0);
+        vals = _mm_add_ps(imp0, vals);
+        _mm_storel_pi(reinterpret_cast<__m64*>(Values[i].data()), vals);
+    }
+}
+
+force_inline void MixLine(const al::span<const float> InSamples, float *RESTRICT dst,
+    float &CurrentGain, const float TargetGain, const float delta, const size_t min_len,
+    const size_t aligned_len, size_t Counter)
+{
+    float gain{CurrentGain};
+    const float step{(TargetGain-gain) * delta};
+
+    size_t pos{0};
+    if(!(std::abs(step) > std::numeric_limits<float>::epsilon()))
+        gain = TargetGain;
+    else
+    {
+        float step_count{0.0f};
+        /* Mix with applying gain steps in aligned multiples of 4. */
+        if(size_t todo{min_len >> 2})
+        {
+            const __m128 four4{_mm_set1_ps(4.0f)};
+            const __m128 step4{_mm_set1_ps(step)};
+            const __m128 gain4{_mm_set1_ps(gain)};
+            __m128 step_count4{_mm_setr_ps(0.0f, 1.0f, 2.0f, 3.0f)};
+            do {
+                const __m128 val4{_mm_load_ps(&InSamples[pos])};
+                __m128 dry4{_mm_load_ps(&dst[pos])};
+
+                /* dry += val * (gain + step*step_count) */
+                dry4 = MLA4(dry4, val4, MLA4(gain4, step4, step_count4));
+
+                _mm_store_ps(&dst[pos], dry4);
+                step_count4 = _mm_add_ps(step_count4, four4);
+                pos += 4;
+            } while(--todo);
+            /* NOTE: step_count4 now represents the next four counts after the
+             * last four mixed samples, so the lowest element represents the
+             * next step count to apply.
+             */
+            step_count = _mm_cvtss_f32(step_count4);
+        }
+        /* Mix with applying left over gain steps that aren't aligned multiples of 4. */
+        for(size_t leftover{min_len&3};leftover;++pos,--leftover)
+        {
+            dst[pos] += InSamples[pos] * (gain + step*step_count);
+            step_count += 1.0f;
+        }
+        if(pos == Counter)
+            gain = TargetGain;
+        else
+            gain += step*step_count;
+
+        /* Mix until pos is aligned with 4 or the mix is done. */
+        for(size_t leftover{aligned_len&3};leftover;++pos,--leftover)
+            dst[pos] += InSamples[pos] * gain;
+    }
+    CurrentGain = gain;
+
+    if(!(std::abs(gain) > GainSilenceThreshold))
+        return;
+    if(size_t todo{(InSamples.size()-pos) >> 2})
+    {
+        const __m128 gain4{_mm_set1_ps(gain)};
+        do {
+            const __m128 val4{_mm_load_ps(&InSamples[pos])};
+            __m128 dry4{_mm_load_ps(&dst[pos])};
+            dry4 = _mm_add_ps(dry4, _mm_mul_ps(val4, gain4));
+            _mm_store_ps(&dst[pos], dry4);
+            pos += 4;
+        } while(--todo);
+    }
+    for(size_t leftover{(InSamples.size()-pos)&3};leftover;++pos,--leftover)
+        dst[pos] += InSamples[pos] * gain;
+}
+
+} // namespace
+
+template<>
+void Resample_<CubicTag,SSETag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    ASSUME(frac < MixerFracOne);
+
+    const CubicCoefficients *RESTRICT filter = al::assume_aligned<16>(state->cubic.filter);
+
+    src -= 1;
+    for(float &out_sample : dst)
+    {
+        const uint pi{frac >> CubicPhaseDiffBits};
+        const float pf{static_cast<float>(frac&CubicPhaseDiffMask) * (1.0f/CubicPhaseDiffOne)};
+        const __m128 pf4{_mm_set1_ps(pf)};
+
+        /* Apply the phase interpolated filter. */
+
+        /* f = fil + pf*phd */
+        const __m128 f4 = MLA4(_mm_load_ps(filter[pi].mCoeffs), pf4,
+            _mm_load_ps(filter[pi].mDeltas));
+        /* r = f*src */
+        __m128 r4{_mm_mul_ps(f4, _mm_loadu_ps(src))};
+
+        r4 = _mm_add_ps(r4, _mm_shuffle_ps(r4, r4, _MM_SHUFFLE(0, 1, 2, 3)));
+        r4 = _mm_add_ps(r4, _mm_movehl_ps(r4, r4));
+        out_sample = _mm_cvtss_f32(r4);
+
+        frac += increment;
+        src  += frac>>MixerFracBits;
+        frac &= MixerFracMask;
+    }
+}
+
+template<>
+void Resample_<BSincTag,SSETag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    const float *const filter{state->bsinc.filter};
+    const __m128 sf4{_mm_set1_ps(state->bsinc.sf)};
+    const size_t m{state->bsinc.m};
+    ASSUME(m > 0);
+    ASSUME(frac < MixerFracOne);
+
+    src -= state->bsinc.l;
+    for(float &out_sample : dst)
+    {
+        // Calculate the phase index and factor.
+        const uint pi{frac >> BSincPhaseDiffBits};
+        const float pf{static_cast<float>(frac&BSincPhaseDiffMask) * (1.0f/BSincPhaseDiffOne)};
+
+        // Apply the scale and phase interpolated filter.
+        __m128 r4{_mm_setzero_ps()};
+        {
+            const __m128 pf4{_mm_set1_ps(pf)};
+            const float *RESTRICT fil{filter + m*pi*2};
+            const float *RESTRICT phd{fil + m};
+            const float *RESTRICT scd{fil + BSincPhaseCount*2*m};
+            const float *RESTRICT spd{scd + m};
+            size_t td{m >> 2};
+            size_t j{0u};
+
+            do {
+                /* f = ((fil + sf*scd) + pf*(phd + sf*spd)) */
+                const __m128 f4 = MLA4(
+                    MLA4(_mm_load_ps(&fil[j]), sf4, _mm_load_ps(&scd[j])),
+                    pf4, MLA4(_mm_load_ps(&phd[j]), sf4, _mm_load_ps(&spd[j])));
+                /* r += f*src */
+                r4 = MLA4(r4, f4, _mm_loadu_ps(&src[j]));
+                j += 4;
+            } while(--td);
+        }
+        r4 = _mm_add_ps(r4, _mm_shuffle_ps(r4, r4, _MM_SHUFFLE(0, 1, 2, 3)));
+        r4 = _mm_add_ps(r4, _mm_movehl_ps(r4, r4));
+        out_sample = _mm_cvtss_f32(r4);
+
+        frac += increment;
+        src  += frac>>MixerFracBits;
+        frac &= MixerFracMask;
+    }
+}
+
+template<>
+void Resample_<FastBSincTag,SSETag>(const InterpState *state, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    const float *const filter{state->bsinc.filter};
+    const size_t m{state->bsinc.m};
+    ASSUME(m > 0);
+    ASSUME(frac < MixerFracOne);
+
+    src -= state->bsinc.l;
+    for(float &out_sample : dst)
+    {
+        // Calculate the phase index and factor.
+        const uint pi{frac >> BSincPhaseDiffBits};
+        const float pf{static_cast<float>(frac&BSincPhaseDiffMask) * (1.0f/BSincPhaseDiffOne)};
+
+        // Apply the phase interpolated filter.
+        __m128 r4{_mm_setzero_ps()};
+        {
+            const __m128 pf4{_mm_set1_ps(pf)};
+            const float *RESTRICT fil{filter + m*pi*2};
+            const float *RESTRICT phd{fil + m};
+            size_t td{m >> 2};
+            size_t j{0u};
+
+            do {
+                /* f = fil + pf*phd */
+                const __m128 f4 = MLA4(_mm_load_ps(&fil[j]), pf4, _mm_load_ps(&phd[j]));
+                /* r += f*src */
+                r4 = MLA4(r4, f4, _mm_loadu_ps(&src[j]));
+                j += 4;
+            } while(--td);
+        }
+        r4 = _mm_add_ps(r4, _mm_shuffle_ps(r4, r4, _MM_SHUFFLE(0, 1, 2, 3)));
+        r4 = _mm_add_ps(r4, _mm_movehl_ps(r4, r4));
+        out_sample = _mm_cvtss_f32(r4);
+
+        frac += increment;
+        src  += frac>>MixerFracBits;
+        frac &= MixerFracMask;
+    }
+}
+
+
+template<>
+void MixHrtf_<SSETag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
+{ MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, BufferSize); }
+
+template<>
+void MixHrtfBlend_<SSETag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize)
+{
+    MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
+        BufferSize);
+}
+
+template<>
+void MixDirectHrtf_<SSETag>(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
+    const al::span<const FloatBufferLine> InSamples, float2 *AccumSamples,
+    float *TempBuf, HrtfChannelState *ChanState, const size_t IrSize, const size_t BufferSize)
+{
+    MixDirectHrtfBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, TempBuf, ChanState,
+        IrSize, BufferSize);
+}
+
+
+template<>
+void Mix_<SSETag>(const al::span<const float> InSamples, const al::span<FloatBufferLine> OutBuffer,
+    float *CurrentGains, const float *TargetGains, const size_t Counter, const size_t OutPos)
+{
+    const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
+    const auto min_len = minz(Counter, InSamples.size());
+    const auto aligned_len = minz((min_len+3) & ~size_t{3}, InSamples.size()) - min_len;
+
+    for(FloatBufferLine &output : OutBuffer)
+        MixLine(InSamples, al::assume_aligned<16>(output.data()+OutPos), *CurrentGains++,
+            *TargetGains++, delta, min_len, aligned_len, Counter);
+}
+
+template<>
+void Mix_<SSETag>(const al::span<const float> InSamples, float *OutBuffer, float &CurrentGain,
+    const float TargetGain, const size_t Counter)
+{
+    const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
+    const auto min_len = minz(Counter, InSamples.size());
+    const auto aligned_len = minz((min_len+3) & ~size_t{3}, InSamples.size()) - min_len;
+
+    MixLine(InSamples, al::assume_aligned<16>(OutBuffer), CurrentGain, TargetGain, delta, min_len,
+        aligned_len, Counter);
+}

externals/openal-soft/core/mixer/mixer_sse2.cpp

@@ -0,0 +1,90 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2014 by Timothy Arceri <t_arceri@yahoo.com.au>.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <xmmintrin.h>
+#include <emmintrin.h>
+
+#include "alnumeric.h"
+#include "defs.h"
+
+struct SSE2Tag;
+struct LerpTag;
+
+
+#if defined(__GNUC__) && !defined(__clang__) && !defined(__SSE2__)
+#pragma GCC target("sse2")
+#endif
+
+template<>
+void Resample_<LerpTag,SSE2Tag>(const InterpState*, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    ASSUME(frac < MixerFracOne);
+
+    const __m128i increment4{_mm_set1_epi32(static_cast<int>(increment*4))};
+    const __m128 fracOne4{_mm_set1_ps(1.0f/MixerFracOne)};
+    const __m128i fracMask4{_mm_set1_epi32(MixerFracMask)};
+
+    alignas(16) uint pos_[4], frac_[4];
+    InitPosArrays(frac, increment, frac_, pos_);
+    __m128i frac4{_mm_setr_epi32(static_cast<int>(frac_[0]), static_cast<int>(frac_[1]),
+        static_cast<int>(frac_[2]), static_cast<int>(frac_[3]))};
+    __m128i pos4{_mm_setr_epi32(static_cast<int>(pos_[0]), static_cast<int>(pos_[1]),
+        static_cast<int>(pos_[2]), static_cast<int>(pos_[3]))};
+
+    auto dst_iter = dst.begin();
+    for(size_t todo{dst.size()>>2};todo;--todo)
+    {
+        const int pos0{_mm_cvtsi128_si32(pos4)};
+        const int pos1{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 4))};
+        const int pos2{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 8))};
+        const int pos3{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 12))};
+        const __m128 val1{_mm_setr_ps(src[pos0  ], src[pos1  ], src[pos2  ], src[pos3  ])};
+        const __m128 val2{_mm_setr_ps(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
+
+        /* val1 + (val2-val1)*mu */
+        const __m128 r0{_mm_sub_ps(val2, val1)};
+        const __m128 mu{_mm_mul_ps(_mm_cvtepi32_ps(frac4), fracOne4)};
+        const __m128 out{_mm_add_ps(val1, _mm_mul_ps(mu, r0))};
+
+        _mm_store_ps(dst_iter, out);
+        dst_iter += 4;
+
+        frac4 = _mm_add_epi32(frac4, increment4);
+        pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, MixerFracBits));
+        frac4 = _mm_and_si128(frac4, fracMask4);
+    }
+
+    if(size_t todo{dst.size()&3})
+    {
+        src += static_cast<uint>(_mm_cvtsi128_si32(pos4));
+        frac = static_cast<uint>(_mm_cvtsi128_si32(frac4));
+
+        do {
+            *(dst_iter++) = lerpf(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
+
+            frac += increment;
+            src  += frac>>MixerFracBits;
+            frac &= MixerFracMask;
+        } while(--todo);
+    }
+}

externals/openal-soft/core/mixer/mixer_sse41.cpp

@@ -0,0 +1,95 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2014 by Timothy Arceri <t_arceri@yahoo.com.au>.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <xmmintrin.h>
+#include <emmintrin.h>
+#include <smmintrin.h>
+
+#include "alnumeric.h"
+#include "defs.h"
+
+struct SSE4Tag;
+struct LerpTag;
+
+
+#if defined(__GNUC__) && !defined(__clang__) && !defined(__SSE4_1__)
+#pragma GCC target("sse4.1")
+#endif
+
+template<>
+void Resample_<LerpTag,SSE4Tag>(const InterpState*, const float *RESTRICT src, uint frac,
+    const uint increment, const al::span<float> dst)
+{
+    ASSUME(frac < MixerFracOne);
+
+    const __m128i increment4{_mm_set1_epi32(static_cast<int>(increment*4))};
+    const __m128 fracOne4{_mm_set1_ps(1.0f/MixerFracOne)};
+    const __m128i fracMask4{_mm_set1_epi32(MixerFracMask)};
+
+    alignas(16) uint pos_[4], frac_[4];
+    InitPosArrays(frac, increment, frac_, pos_);
+    __m128i frac4{_mm_setr_epi32(static_cast<int>(frac_[0]), static_cast<int>(frac_[1]),
+        static_cast<int>(frac_[2]), static_cast<int>(frac_[3]))};
+    __m128i pos4{_mm_setr_epi32(static_cast<int>(pos_[0]), static_cast<int>(pos_[1]),
+        static_cast<int>(pos_[2]), static_cast<int>(pos_[3]))};
+
+    auto dst_iter = dst.begin();
+    for(size_t todo{dst.size()>>2};todo;--todo)
+    {
+        const int pos0{_mm_extract_epi32(pos4, 0)};
+        const int pos1{_mm_extract_epi32(pos4, 1)};
+        const int pos2{_mm_extract_epi32(pos4, 2)};
+        const int pos3{_mm_extract_epi32(pos4, 3)};
+        const __m128 val1{_mm_setr_ps(src[pos0  ], src[pos1  ], src[pos2  ], src[pos3  ])};
+        const __m128 val2{_mm_setr_ps(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
+
+        /* val1 + (val2-val1)*mu */
+        const __m128 r0{_mm_sub_ps(val2, val1)};
+        const __m128 mu{_mm_mul_ps(_mm_cvtepi32_ps(frac4), fracOne4)};
+        const __m128 out{_mm_add_ps(val1, _mm_mul_ps(mu, r0))};
+
+        _mm_store_ps(dst_iter, out);
+        dst_iter += 4;
+
+        frac4 = _mm_add_epi32(frac4, increment4);
+        pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, MixerFracBits));
+        frac4 = _mm_and_si128(frac4, fracMask4);
+    }
+
+    if(size_t todo{dst.size()&3})
+    {
+        /* NOTE: These four elements represent the position *after* the last
+         * four samples, so the lowest element is the next position to
+         * resample.
+         */
+        src += static_cast<uint>(_mm_cvtsi128_si32(pos4));
+        frac = static_cast<uint>(_mm_cvtsi128_si32(frac4));
+
+        do {
+            *(dst_iter++) = lerpf(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
+
+            frac += increment;
+            src  += frac>>MixerFracBits;
+            frac &= MixerFracMask;
+        } while(--todo);
+    }
+}