/*
  ZynAddSubFX - a software synthesizer

  RBFilter.h - Several state-variable filters
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  Modified for rakarrack by Ryan Billing

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License
  as published by the Free Software Foundation.

  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 (version 2) for more details.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#ifndef RB_FILTER_H
#define RB_FILTER_H

#include "global.h"
#include "Filter_.h"
class RBFilter:public Filter_
{
public:
    RBFilter (int Ftype, float Ffreq, float Fq,
              int Fstages);
    ~RBFilter ();
    void filterout (float * smp);
    float filterout_s (float smp);

    void setfreq (float frequency);
    void setfreq_and_q (float frequency, float q_);
    void setq (float q_);
    void directmod(float lfo);

    void settype (int type_);
    void setgain (float dBgain);
    void setstages (int stages_);
    void setmix (int mix, float lpmix, float bpmix, float hpmix);
    void setmode(int mode);
    void cleanup ();

private:

    struct fstage {
        float low, high, band, notch;
    } st[MAX_FILTER_STAGES + 1];

    struct parameters {
        float f, q, q_sqrt;
    } par, ipar;

    void singlefilterout (float * smp, fstage & x, parameters & par);
    float singlefilterout_s (float smp, fstage & x, parameters & par);
    void computefiltercoefs ();
    void computefiltercoefs_hiQ ();

    int type;			//The type of the filter (LPF1,HPF1,LPF2,HPF2...)
    int stages;			//how many times the filter is applied (0->1,1->2,etc.)
    int abovenq;			//this is 1 if the frequency is above the nyquist
    int oldabovenq;
    int needsinterpolation, firsttime, en_mix;
    int qmode;                   //set to true for compatibility to old presets.  0 means Q = 1/q

    float freq;		//Frequency given in Hz
    float q;			//Q factor (resonance or Q factor)
    float gain;		//the gain of the filter (if are shelf/peak) filters
    float hpg, lpg, bpg;
    float oldq, oldsq, oldf;
    float a_smooth_tc, b_smooth_tc;
    float iper;			//inverse of PERIOD





};


#endif
