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/**
bespoke synth, a software modular synthesizer
Copyright (C) 2021 Ryan Challinor (contact: awwbees@gmail.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
//
// LFO.cpp
// modularSynth
//
// Created by Ryan Challinor on 12/27/12.
//
//
#include "LFO.h"
#include "OpenFrameworksPort.h"
#include "Profiler.h"
//static
PerlinNoise LFO::sPerlinNoise;
LFO::LFO()
{
SetPeriod(kInterval_1n);
}
LFO::~LFO()
{
TheTransport->RemoveListener(this);
TheTransport->RemoveAudioPoller(this);
}
float LFO::CalculatePhase(int samplesIn /*= 0*/, bool doTransform /* = true*/) const
{
float ret;
if (mPeriod == kInterval_Free)
{
ret = mFreePhase + float(samplesIn) / gSampleRate * mFreeRate;
}
else
{
float period = TheTransport->GetDuration(mPeriod) / TheTransport->GetDuration(kInterval_1n);
float phase = TheTransport->GetMeasureTime(gTime + samplesIn * gInvSampleRateMs) / period + (1 - mPhaseOffset) + 1; //+1 so we can have negative samplesIn
phase -= int(phase) / 2 * 2; //using 2 allows for shuffle to work
ret = phase;
}
if (doTransform)
return TransformPhase(ret);
return ret;
}
float LFO::TransformPhase(float phase) const
{
if (mLength != 1 && mLength > 0)
phase = int(phase) + ofClamp((phase - int(phase)) / mLength, 0, 1);
else if (mLength != 1)
phase = 0;
return phase;
}
float LFO::Value(int samplesIn /*= 0*/, float forcePhase /*= -1*/) const
{
//PROFILER(LFO_Value);
if (mPeriod == kInterval_None) //no oscillator
return mMode == kLFOMode_Envelope ? 1 : 0;
float phase = CalculatePhase(samplesIn);
if (forcePhase != -1 && !std::isnan(forcePhase))
phase = forcePhase;
phase *= FTWO_PI;
float sample;
bool nonstandardOsc = false;
//use sample-and-hold value
if (mOsc.GetType() == kOsc_Random)
{
nonstandardOsc = true;
sample = pow(mRandom.Value(gTime + samplesIn * gInvSampleRateMs), powf((1 - mOsc.GetPulseWidth()) * 2, 2));
}
else if (mOsc.GetType() == kOsc_Drunk)
{
nonstandardOsc = true;
sample = mDrunk;
}
else if (mOsc.GetType() == kOsc_Perlin)
{
nonstandardOsc = true;
double perlinPos = gTime + gInvSampleRateMs * samplesIn;
if (forcePhase != -1 && !std::isnan(forcePhase))
perlinPos += forcePhase * 1000;
double perlinPhase = perlinPos * mFreeRate / 1000.0f;
sample = sPerlinNoise.noise(perlinPhase, mPerlinSeed, -perlinPhase);
}
else
{
sample = mOsc.Value(phase);
if (mMode == kLFOMode_Envelope) //rescale to 0 1
sample = sample * .5f + .5f;
}
if (nonstandardOsc)
{
if (mOsc.GetPulseWidth() != .5f)
sample = Bias(sample, mOsc.GetPulseWidth());
if (mMode == kLFOMode_Oscillator) //rescale to -1 1
sample = (sample - .5f * 2);
}
return sample;
}
void LFO::SetPeriod(NoteInterval interval)
{
if (interval == kInterval_Free)
mFreePhase = CalculatePhase();
mPeriod = interval;
if (mOsc.GetType() == kOsc_Random)
{
TransportListenerInfo* transportListenerInfo = TheTransport->GetListenerInfo(this);
if (transportListenerInfo != nullptr)
transportListenerInfo->mInterval = mPeriod;
}
if (mOsc.GetType() == kOsc_Drunk || mPeriod == kInterval_Free)
TheTransport->AddAudioPoller(this);
else
TheTransport->RemoveAudioPoller(this);
}
void LFO::SetType(OscillatorType type)
{
mOsc.SetType(type);
if (type == kOsc_Random)
TheTransport->AddListener(this, mPeriod, OffsetInfo(0, true), false);
else
TheTransport->RemoveListener(this);
if (type == kOsc_Perlin)
mPerlinSeed = gRandom() % 10000;
if (mOsc.GetType() == kOsc_Drunk || mOsc.GetType() == kOsc_Perlin || mPeriod == kInterval_Free)
TheTransport->AddAudioPoller(this);
else
TheTransport->RemoveAudioPoller(this);
}
void LFO::OnTimeEvent(double time)
{
if (mOsc.GetSoften() == 0)
mRandom.SetValue(ofRandom(1));
else
mRandom.Start(time, ofRandom(1), time + mOsc.GetSoften() * 30);
}
void LFO::OnTransportAdvanced(float amount)
{
if (mOsc.GetType() == kOsc_Drunk)
{
float distance = 0;
if (mPeriod == kInterval_Free)
{
distance = mFreeRate / 40;
}
else
{
distance = TheTransport->GetDuration(kInterval_64n) / TheTransport->GetDuration(mPeriod);
}
float drunk = ofRandom(-distance, distance);
if (mDrunk + drunk > 1 || mDrunk + drunk < 0)
drunk *= -1;
mDrunk = ofClamp(mDrunk + drunk, 0, 1);
}
if (mPeriod == kInterval_Free || mOsc.GetType() == kOsc_Perlin)
{
mFreePhase += mFreeRate * amount * TheTransport->MsPerBar() / 1000;
double wrap = mOsc.GetShuffle() > 0 ? 2 : 1;
if (mFreePhase > wrap || mFreePhase < 0)
{
mFreePhase = fmod(mFreePhase, wrap);
if (mOsc.GetType() == kOsc_Random)
OnTimeEvent(gTime);
}
}
}
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