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/**
* 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(ALuint index)
{
constexpr float scale{al::MathDefs<float>::Tau() / WAVEFORM_FRACONE};
return std::sin(static_cast<float>(index) * scale);
}
inline float Saw(ALuint index)
{ return static_cast<float>(index)*(2.0f/WAVEFORM_FRACONE) - 1.0f; }
inline float Square(ALuint index)
{ return static_cast<float>(static_cast<int>((index>>(WAVEFORM_FRACBITS-2))&2) - 1); }
inline float One(ALuint) { return 1.0f; }
template<float (&func)(ALuint)>
void Modulate(float *RESTRICT dst, ALuint index, const ALuint 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, ALuint, const ALuint, size_t){};
ALuint mIndex{0};
ALuint mStep{1};
struct {
BiquadFilter Filter;
float CurrentGains[MAX_OUTPUT_CHANNELS]{};
float TargetGains[MAX_OUTPUT_CHANNELS]{};
} mChans[MaxAmbiChannels];
void deviceUpdate(const ALCdevice *device) 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*)
{
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 == AL_RING_MODULATOR_SINUSOID)
mGetSamples = Modulate<Sin>;
else if(props->Modulator.Waveform == AL_RING_MODULATOR_SAWTOOTH)
mGetSamples = Modulate<Saw>;
else /*if(props->Modulator.Waveform == AL_RING_MODULATOR_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];
size_t td{minz(MAX_UPDATE_SAMPLES, samplesToDo-base)};
mGetSamples(modsamples, mIndex, mStep, td);
mIndex += static_cast<ALuint>(mStep * td);
mIndex &= WAVEFORM_FRACMASK;
auto chandata = std::addressof(mChans[0]);
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 {
EffectState *create() override { return new ModulatorState{}; }
};
} // namespace
EffectStateFactory *ModulatorStateFactory_getFactory()
{
static ModulatorStateFactory ModulatorFactory{};
return &ModulatorFactory;
}
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