MOLOSS Code

/**************************************************************************
   Copyright (C) 2019 Arnaud Champenois arthelion@free.fr

	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/>.
**************************************************************************/


#pragma once
#include "TimeVariant.h"

class TVF : public TimeVariant {
public:

	TVF(const TVFParameters&tvfParam) :
		TimeVariant(tvfParam), mTVFParam(tvfParam) {}
	virtual ~TVF() override;

	virtual void init(double sampleRate) override;

	double next(double value) {
		if (mLowCutFrequency > TVFLowestCutoffFrequency)
			value = mLowCutFilter.processSample(value);

		if (!isActive() && isLFOBypassed() && mCutoffCtrlOffset == 0.0f) {
			moveLFO(1.0);
			value = mFilter.processSample(value);
		}
		else {
			double cutoff = (nextFreqADSR(false)*mCutoffValue+mCutoffCtrlOffset)*nextLFO();

			if (cutoff < TVFLowestCutoffFrequency)
				return 0.0;

			if (cutoff > mMaxCutoff)
				cutoff = mMaxCutoff;

			mFilter.parameters->setCutOffFrequency(mSampleRate, cutoff, mResonanceValue);
			value = mFilter.processSample(value);
		}

		if (mMidGain != 0.0f) {
			value = mBandFilter.processSample(value);
		}

		return value;
	}


	void updateInternalValues(int controller = 0) override;

private:
	juce::dsp::StateVariableFilter::Filter<double> mFilter;
	juce::dsp::StateVariableFilter::Filter<double> mLowCutFilter;
	juce::dsp::IIR::Filter<double> mBandFilter;

	//Parameters
	const TVFParameters& mTVFParam;

	// Current values
	double mLowCutFrequency = 0.0;
	double mCutoffValue = TVFHighestCutoffFrequency;
	double mMaxCutoff = TVFHighestCutoffFrequency;
	double mResonanceValue = TVFDefaultResonance;

	float mMidFreq = 0.0f, mMidGain = 0.0f, mMidQ = 0.0f;
	float mCutoffCtrlOffset = 0.0f;
};