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asection.h

/*
    Copyright (C) 2003 Fons Adriaensen <fons.adriaensen@skynet.be>
    
    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.

    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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#ifndef __ASECTION_H
#define __ASECTION_H


#include "global.h"


#define PERIOD 64
#define MIXLEN 64
#define NCHANN 4
#define NRANKS 32


class Diffuser
{
public:
    
    void init (int size, float c);
    void fini (void);
    int  size (void) { return _size; }
    float process (float x)
    {
        float w;
 
        w = x - _c * _data [_i];
        x = _data [_i] + _c * w;
        _data [_i] = w;
        if (++_i == _size) _i = 0;
        return x;
    }

private:

    float     *_data;
    int        _size;
    int        _i;
    float      _c;
};


class Asection
{
public:

    Asection (float fsam);
    ~Asection (void); 

    float *get_wptr (void) { return _base + _offs0; }
    Fparm *get_apar (void) { return _apar; }

    void set_size (float size);
    void process (float vol, float *W, float *X, float *Y, float *R);
    
    static float _refl [16];

private:

    enum { AZIMUTH, STWIDTH, DIRECT, REFLECT, REVERB };

    int      _offs0;
    int      _offs [16];
    float    _fsam;
    float   *_base;
    float    _sw;
    float    _sx;
    float    _sy;
    Diffuser _dif0;
    Diffuser _dif1;
    Diffuser _dif2;
    Diffuser _dif3;
    Fparm    _apar [5];
};


#endif


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