🛠️🐜 Antkeeper superbuild with dependencies included
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183 lines
5.8 KiB
183 lines
5.8 KiB
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2009 by Chris Robinson.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <algorithm>
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#include <array>
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#include <cstdlib>
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#include <iterator>
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#include "alc/effects/base.h"
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#include "almalloc.h"
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#include "alnumbers.h"
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#include "alnumeric.h"
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#include "alspan.h"
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#include "core/ambidefs.h"
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#include "core/bufferline.h"
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#include "core/context.h"
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#include "core/devformat.h"
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#include "core/device.h"
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#include "core/effectslot.h"
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#include "core/filters/biquad.h"
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#include "core/mixer.h"
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#include "intrusive_ptr.h"
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namespace {
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using uint = unsigned int;
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#define MAX_UPDATE_SAMPLES 128
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#define WAVEFORM_FRACBITS 24
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#define WAVEFORM_FRACONE (1<<WAVEFORM_FRACBITS)
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#define WAVEFORM_FRACMASK (WAVEFORM_FRACONE-1)
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inline float Sin(uint index)
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{
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constexpr float scale{al::numbers::pi_v<float>*2.0f / WAVEFORM_FRACONE};
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return std::sin(static_cast<float>(index) * scale);
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}
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inline float Saw(uint index)
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{ return static_cast<float>(index)*(2.0f/WAVEFORM_FRACONE) - 1.0f; }
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inline float Square(uint index)
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{ return static_cast<float>(static_cast<int>((index>>(WAVEFORM_FRACBITS-2))&2) - 1); }
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inline float One(uint) { return 1.0f; }
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template<float (&func)(uint)>
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void Modulate(float *RESTRICT dst, uint index, const uint step, size_t todo)
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{
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for(size_t i{0u};i < todo;i++)
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{
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index += step;
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index &= WAVEFORM_FRACMASK;
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dst[i] = func(index);
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}
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}
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struct ModulatorState final : public EffectState {
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void (*mGetSamples)(float*RESTRICT, uint, const uint, size_t){};
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uint mIndex{0};
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uint mStep{1};
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struct {
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BiquadFilter Filter;
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float CurrentGains[MAX_OUTPUT_CHANNELS]{};
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float TargetGains[MAX_OUTPUT_CHANNELS]{};
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} mChans[MaxAmbiChannels];
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void deviceUpdate(const DeviceBase *device, const Buffer &buffer) override;
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void update(const ContextBase *context, const EffectSlot *slot, const EffectProps *props,
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const EffectTarget target) override;
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void process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn,
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const al::span<FloatBufferLine> samplesOut) override;
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DEF_NEWDEL(ModulatorState)
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};
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void ModulatorState::deviceUpdate(const DeviceBase*, const Buffer&)
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{
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for(auto &e : mChans)
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{
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e.Filter.clear();
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std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
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}
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}
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void ModulatorState::update(const ContextBase *context, const EffectSlot *slot,
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const EffectProps *props, const EffectTarget target)
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{
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const DeviceBase *device{context->mDevice};
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const float step{props->Modulator.Frequency / static_cast<float>(device->Frequency)};
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mStep = fastf2u(clampf(step*WAVEFORM_FRACONE, 0.0f, float{WAVEFORM_FRACONE-1}));
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if(mStep == 0)
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mGetSamples = Modulate<One>;
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else if(props->Modulator.Waveform == ModulatorWaveform::Sinusoid)
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mGetSamples = Modulate<Sin>;
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else if(props->Modulator.Waveform == ModulatorWaveform::Sawtooth)
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mGetSamples = Modulate<Saw>;
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else /*if(props->Modulator.Waveform == ModulatorWaveform::Square)*/
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mGetSamples = Modulate<Square>;
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float f0norm{props->Modulator.HighPassCutoff / static_cast<float>(device->Frequency)};
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f0norm = clampf(f0norm, 1.0f/512.0f, 0.49f);
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/* Bandwidth value is constant in octaves. */
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mChans[0].Filter.setParamsFromBandwidth(BiquadType::HighPass, f0norm, 1.0f, 0.75f);
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for(size_t i{1u};i < slot->Wet.Buffer.size();++i)
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mChans[i].Filter.copyParamsFrom(mChans[0].Filter);
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mOutTarget = target.Main->Buffer;
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auto set_gains = [slot,target](auto &chan, al::span<const float,MaxAmbiChannels> coeffs)
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{ ComputePanGains(target.Main, coeffs.data(), slot->Gain, chan.TargetGains); };
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SetAmbiPanIdentity(std::begin(mChans), slot->Wet.Buffer.size(), set_gains);
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}
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void ModulatorState::process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn, const al::span<FloatBufferLine> samplesOut)
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{
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for(size_t base{0u};base < samplesToDo;)
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{
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alignas(16) float modsamples[MAX_UPDATE_SAMPLES];
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const size_t td{minz(MAX_UPDATE_SAMPLES, samplesToDo-base)};
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mGetSamples(modsamples, mIndex, mStep, td);
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mIndex += static_cast<uint>(mStep * td);
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mIndex &= WAVEFORM_FRACMASK;
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auto chandata = std::begin(mChans);
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for(const auto &input : samplesIn)
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{
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alignas(16) float temps[MAX_UPDATE_SAMPLES];
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chandata->Filter.process({&input[base], td}, temps);
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for(size_t i{0u};i < td;i++)
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temps[i] *= modsamples[i];
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MixSamples({temps, td}, samplesOut, chandata->CurrentGains, chandata->TargetGains,
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samplesToDo-base, base);
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++chandata;
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}
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base += td;
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}
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}
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struct ModulatorStateFactory final : public EffectStateFactory {
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al::intrusive_ptr<EffectState> create() override
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{ return al::intrusive_ptr<EffectState>{new ModulatorState{}}; }
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};
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} // namespace
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EffectStateFactory *ModulatorStateFactory_getFactory()
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{
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static ModulatorStateFactory ModulatorFactory{};
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return &ModulatorFactory;
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}
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