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src/mt32/freeverb/comb.h
00001 // Comb filter class declaration
00002 //
00003 // Written by Jezar at Dreampoint, June 2000
00004 // http://www.dreampoint.co.uk
00005 // This code is public domain
00006 
00007 #ifndef _comb_
00008 #define _comb_
00009 
00010 #include "denormals.h"
00011 #include "../FileStream.h"
00012 
00013 class comb
00014 {
00015 public:
00016                         comb();
00017                 void    setbuffer(float *buf, int size);
00018                 void    deletebuffer();
00019         inline  float   process(float inp);
00020                 void    mute();
00021                 void    setdamp(float val);
00022                 float   getdamp();
00023                 void    setfeedback(float val);
00024                 float   getfeedback();
00025 
00026                                         void saveState( std::ostream &stream );
00027                                         void loadState( std::istream &stream );
00028 private:
00029         float   feedback;
00030         float   filterstore;
00031         float   damp1;
00032         float   damp2;
00033         float   *buffer;
00034         int     bufsize;
00035         int     bufidx;
00036 };
00037 
00038 
00039 // Big to inline - but crucial for speed
00040 
00041 inline float comb::process(float input)
00042 {
00043         float output;
00044 
00045         output = undenormalise(buffer[bufidx]);
00046 
00047         filterstore = undenormalise((output*damp2) + (filterstore*damp1));
00048 
00049         buffer[bufidx] = input + (filterstore*feedback);
00050 
00051         if (++bufidx>=bufsize) bufidx = 0;
00052 
00053         return output;
00054 }
00055 
00056 #endif //_comb_