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/*
Copyright (C) 2010-2012 Florian Jung
This file is part of flo's FM synth.
flo's FM synth 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 3 of the License, or
(at your option) any later version.
flo's FM synth 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 flo's FM synth. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <stdlib.h>
#include "lfos.h"
#include "globals.h"
#include "fixed.h"
#include "defines.h"
void uninit_lfo(int i)
{
if (lfo[i])
{
for (int j=0;j<lfo_res[i];++j)
delete [] lfo[i][j];
delete [] lfo[i];
lfo[i]=NULL;
}
}
void init_lfo(int i)
{
//two possible divisions by zero are avoided, because
//values <= 0 will make the program use the default
//(nonzero) values.
lfo_res[i]=samp_rate/lfo_freq_hz[i]/lfo_update_frames;
lfo[i]=new fixed_t* [lfo_res[i]];
for (int j=0;j<lfo_res[i];++j)
{
lfo[i][j]=new fixed_t [N_LFO_LEVELS];
float temp=sin(j*2.0*3.141592654/lfo_res[i]);
for (int k=0;k<N_LFO_LEVELS;++k)
lfo[i][j][k]= (1.0 + temp*(float(LFO_MAX)*k/N_LFO_LEVELS)) * ONE;
}
}
void init_snh()
{
sample_and_hold_frames=samp_rate/snh_freq_hz;
}
void maybe_calc_lfos()
{
static int lfocnt=0;
static int snhcnt=0;
if (lfocnt==0)
{
lfocnt=lfo_update_frames;
for (int i=0;i<N_LFOS;++i)
{
lfo_phase[i]=(lfo_phase[i]+1)%lfo_res[i];
curr_lfo[i]=lfo[i][lfo_phase[i]];
}
}
if (snhcnt==0)
{
snhcnt=sample_and_hold_frames;
//temp ranges between -ONE and ONE
fixed_t temp = (float(rand())/(RAND_MAX/2) - 1.0) * ONE;
for (int i=0;i<N_LFO_LEVELS;++i)
sample_and_hold[i]= temp*i/(N_LFO_LEVELS-1) + ONE;
curr_lfo[SNH_LFO]=sample_and_hold;
// could be moved to some init function, but looks clearer and
// does not eat up the cpu too much ;)
}
--lfocnt;
--snhcnt;
}
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