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// Allpass filter declaration
//
// Written by Jezar at Dreampoint, June 2000
// http://www.dreampoint.co.uk
// This code is public domain
#ifndef _allpass_
#define _allpass_
#include "denormals.h"
//---------------------------------------------------------
// allpass
//---------------------------------------------------------
class allpass
{
float feedback;
float *buffer;
int bufsize;
int bufidx;
public:
allpass() { bufidx = 0; }
void setbuffer(float *buf, int size) {
buffer = buf;
bufsize = size;
}
float process(float input) {
float bufout = buffer[bufidx];
undenormalise(bufout);
float output = -input + bufout;
buffer[bufidx] = input + (bufout*feedback);
if (++bufidx >= bufsize)
bufidx = 0;
// bufidx = ++bufidx % bufsize;
return output;
}
void mute() {
for (int i=0; i<bufsize; i++)
buffer[i]=0;
}
void setfeedback(float val) { feedback = val; }
float getfeedback() { return feedback; }
};
// Big to inline - but crucial for speed
#endif//_allpass
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