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 "../JuceLibraryCode/JuceHeader.h"
#include "Chorus.h"
#include "StereoDelay.h"
#include "Metronome.h"
#include <list>

/*!
 * The Synth class is the sound generator. It take care of :
 * - affecting voice according to mode and polyphony,
 * - mixing 
 * - applying effects Chorus, Delay and Reverb,
 * - Adjusting output gain. 
 * Every computation is done in double precision, to allow algos such as FM 
 * to be coded very simply without having to manage rounding effects.
 * The most of processing is done "inline" as in JUCE philosophy.
 */
class Synth : public Synthesiser {

public:
	typedef enum {
		POLY = 0,
		MONO = 1,
		MONO_LEGATO = 2,
		POLY_RINGING = 3
	} PolyMode;

	Synth(SynthParameters&param) :
	mChorus(param), mDelay(param), mSynthParameters(param) {}

	virtual void handleController(int midiChannel,
		int controllerNumber,
		int controllerValue) override;

	virtual void handleProgramChange(int midiChannel, int programNumber) override;

	virtual void setCurrentPlaybackSampleRate(double sampleRate) override;

	void updateInternalValues();

	bool isPlaying() const {
		for (auto* voice : voices) {
			if (voice->isVoiceActive())
				return true;
		}
		return false;
	}

	bool isMuted() const {
		for (auto* voice : voices) {
			if (voice->isVoiceActive())
				return false;
		}
		return true;
	}

	virtual void noteOn(const int midiChannel, const int midiNoteNumber, const float velocity) override;

	virtual void noteOff(int midiChannel,
		int midiNoteNumber,
		float velocity,
		bool allowTailOff) override;

	void setMonoVoice() {
		mMonoVoice = voices[0];
	}

	bool isMono() const { return (( mPolyMode == MONO) || (mPolyMode == MONO_LEGATO));  }


protected:
	virtual void renderVoices(AudioBuffer<float>& outputAudio,
		int startSample, int numSamples) override;


	virtual SynthesiserVoice* findFreeVoice(SynthesiserSound* soundToPlay,
		int midiChannel,
		int midiNoteNumber,
		bool stealIfNoneAvailable) const;

private:

	struct NoteDescr { 
		int midiNoteNumber; float velocity; 
		bool operator==(const NoteDescr& d) const { return d.midiNoteNumber == midiNoteNumber; }
	};

	std::list<NoteDescr> mNoteList;

	Chorus mChorus;
	StereoDelay mDelay;
	Reverb mReverb;
	double mGain = 1.0;
	bool mGainAutoset = true;
	bool mReverbActive = false;
	PolyMode mPolyMode = POLY;
	SynthParameters& mSynthParameters;
	SynthesiserVoice* mMonoVoice;

	Metronome mMetronome;
	bool mMetronomOn = false;
};