/*
  ZynAddSubFX - a software synthesizer

  Envelope.h - Envelope implementation
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  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 2
  of the License, or (at your option) any later version.
*/

#ifndef ENVELOPE_H
#define ENVELOPE_H

#include "../globals.h"

/**Implementation of a general Envelope*/
class Envelope
{
    public:

        /**Constructor*/
        Envelope(class EnvelopeParams &pars, float basefreq, float dt);
        /**Destructor*/
        ~Envelope();
        void releasekey();
        /**Push Envelope to finishing state*/
        void forceFinish(void);
        float envout();
        float envout_dB();
        /**Determines the status of the Envelope
         * @return returns 1 if the envelope is finished*/
        bool finished() const;
    private:
        float env_rap2dB(float rap);
        float env_dB2rap(float db);
        int   envpoints;
        int   envsustain;    //"-1" means disabled
        float envdt[MAX_ENVELOPE_POINTS]; //millisecons
        float envval[MAX_ENVELOPE_POINTS]; // [0.0f .. 1.0f]
        float envstretch;
        int   linearenvelope;

        int   currentpoint;    //current envelope point (starts from 1)
        int   forcedrelease;
        bool  keyreleased;    //if the key was released
        bool  envfinish;
        float t; // the time from the last point
        float inct; // the time increment
        float envoutval; //used to do the forced release
};


#endif