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/**************************************************************************
fmval.cpp - central computing function
-------------------
begin : January 03rd 2003
copyright : (C) 2003 by Daniel Gruen
email : daniel_gruen@web.de
***************************************************************************/
/***************************************************************************
* *
* 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 is a slim and special fms version for qliss3d
// please use the original version from http://sourceforge.net/projects/fmsynth
// if you want to do anything on it
#include "include/fmval.h"
#include "include/version.h"
#include "include/fmifstream.h"
#include <iostream>
#include <cmath>
using namespace std;
float fmval(FMData *f, float atime){
int v = 0;
while(v < f->getVlen() && f->vtl[v].getTime() <= atime) {
v++;
}
switch(f->vtl[v-1].getLinetype()){
case 0:
return -1; // just do nothing
case 2:
/* linetype 2: sine, linear beginning */
return f->vtl[v-1].getValue() +
sin((atime - f->vtl[v-1].getTime()) / (f->vtl[v].getTime() - f->vtl[v-1].getTime()) * 90.0 * PI180) *
(f->vtl[v].getValue() - f->vtl[v-1].getValue());
case 3:
/* linetype 3: sine, curved beginning */
return f->vtl[v].getValue() +
sin(((atime - f->vtl[v-1].getTime()) / (f->vtl[v].getTime() - f->vtl[v-1].getTime()) * 90.0 + 90.0) * PI180) *
(f->vtl[v-1].getValue() - f->vtl[v].getValue());
}
if(debug_level)
cout << "linetype of " << v-1 << " (" << int(f->vtl[v-1].getLinetype()) << ") is wrong!" << endl;
return -2; // wrong linetype
}
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