update openal-soft

sync point: master-ac5d40e40a0155351fe1be4aab30017b6a13a859

Engine/lib/openal-soft/Alc/effects/modulator.cpp

@@ -0,0 +1,173 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2009 by Chris Robinson.
+ * 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 <cmath>
+#include <cstdlib>
+
+#include <cmath>
+#include <algorithm>
+
+#include "alcmain.h"
+#include "alcontext.h"
+#include "core/filters/biquad.h"
+#include "effectslot.h"
+#include "vecmat.h"
+
+
+namespace {
+
+#define MAX_UPDATE_SAMPLES 128
+
+#define WAVEFORM_FRACBITS  24
+#define WAVEFORM_FRACONE   (1<<WAVEFORM_FRACBITS)
+#define WAVEFORM_FRACMASK  (WAVEFORM_FRACONE-1)
+
+inline float Sin(uint index)
+{
+    constexpr float scale{al::MathDefs<float>::Tau() / WAVEFORM_FRACONE};
+    return std::sin(static_cast<float>(index) * scale);
+}
+
+inline float Saw(uint index)
+{ return static_cast<float>(index)*(2.0f/WAVEFORM_FRACONE) - 1.0f; }
+
+inline float Square(uint index)
+{ return static_cast<float>(static_cast<int>((index>>(WAVEFORM_FRACBITS-2))&2) - 1); }
+
+inline float One(uint) { return 1.0f; }
+
+template<float (&func)(uint)>
+void Modulate(float *RESTRICT dst, uint index, const uint step, size_t todo)
+{
+    for(size_t i{0u};i < todo;i++)
+    {
+        index += step;
+        index &= WAVEFORM_FRACMASK;
+        dst[i] = func(index);
+    }
+}
+
+
+struct ModulatorState final : public EffectState {
+    void (*mGetSamples)(float*RESTRICT, uint, const uint, size_t){};
+
+    uint mIndex{0};
+    uint mStep{1};
+
+    struct {
+        BiquadFilter Filter;
+
+        float CurrentGains[MAX_OUTPUT_CHANNELS]{};
+        float TargetGains[MAX_OUTPUT_CHANNELS]{};
+    } mChans[MaxAmbiChannels];
+
+
+    void deviceUpdate(const ALCdevice *device, const Buffer &buffer) override;
+    void update(const ALCcontext *context, const EffectSlot *slot, const EffectProps *props,
+        const EffectTarget target) override;
+    void process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn,
+        const al::span<FloatBufferLine> samplesOut) override;
+
+    DEF_NEWDEL(ModulatorState)
+};
+
+void ModulatorState::deviceUpdate(const ALCdevice*, const Buffer&)
+{
+    for(auto &e : mChans)
+    {
+        e.Filter.clear();
+        std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
+    }
+}
+
+void ModulatorState::update(const ALCcontext *context, const EffectSlot *slot,
+    const EffectProps *props, const EffectTarget target)
+{
+    const ALCdevice *device{context->mDevice.get()};
+
+    const float step{props->Modulator.Frequency / static_cast<float>(device->Frequency)};
+    mStep = fastf2u(clampf(step*WAVEFORM_FRACONE, 0.0f, float{WAVEFORM_FRACONE-1}));
+
+    if(mStep == 0)
+        mGetSamples = Modulate<One>;
+    else if(props->Modulator.Waveform == ModulatorWaveform::Sinusoid)
+        mGetSamples = Modulate<Sin>;
+    else if(props->Modulator.Waveform == ModulatorWaveform::Sawtooth)
+        mGetSamples = Modulate<Saw>;
+    else /*if(props->Modulator.Waveform == ModulatorWaveform::Square)*/
+        mGetSamples = Modulate<Square>;
+
+    float f0norm{props->Modulator.HighPassCutoff / static_cast<float>(device->Frequency)};
+    f0norm = clampf(f0norm, 1.0f/512.0f, 0.49f);
+    /* Bandwidth value is constant in octaves. */
+    mChans[0].Filter.setParamsFromBandwidth(BiquadType::HighPass, f0norm, 1.0f, 0.75f);
+    for(size_t i{1u};i < slot->Wet.Buffer.size();++i)
+        mChans[i].Filter.copyParamsFrom(mChans[0].Filter);
+
+    mOutTarget = target.Main->Buffer;
+    auto set_gains = [slot,target](auto &chan, al::span<const float,MaxAmbiChannels> coeffs)
+    { ComputePanGains(target.Main, coeffs.data(), slot->Gain, chan.TargetGains); };
+    SetAmbiPanIdentity(std::begin(mChans), slot->Wet.Buffer.size(), set_gains);
+}
+
+void ModulatorState::process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn, const al::span<FloatBufferLine> samplesOut)
+{
+    for(size_t base{0u};base < samplesToDo;)
+    {
+        alignas(16) float modsamples[MAX_UPDATE_SAMPLES];
+        const size_t td{minz(MAX_UPDATE_SAMPLES, samplesToDo-base)};
+
+        mGetSamples(modsamples, mIndex, mStep, td);
+        mIndex += static_cast<uint>(mStep * td);
+        mIndex &= WAVEFORM_FRACMASK;
+
+        auto chandata = std::begin(mChans);
+        for(const auto &input : samplesIn)
+        {
+            alignas(16) float temps[MAX_UPDATE_SAMPLES];
+
+            chandata->Filter.process({&input[base], td}, temps);
+            for(size_t i{0u};i < td;i++)
+                temps[i] *= modsamples[i];
+
+            MixSamples({temps, td}, samplesOut, chandata->CurrentGains, chandata->TargetGains,
+                samplesToDo-base, base);
+            ++chandata;
+        }
+
+        base += td;
+    }
+}
+
+
+struct ModulatorStateFactory final : public EffectStateFactory {
+    al::intrusive_ptr<EffectState> create() override
+    { return al::intrusive_ptr<EffectState>{new ModulatorState{}}; }
+};
+
+} // namespace
+
+EffectStateFactory *ModulatorStateFactory_getFactory()
+{
+    static ModulatorStateFactory ModulatorFactory{};
+    return &ModulatorFactory;
+}