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/*
* dist.c - wave shaping extern
* Copyright (c) 2000-2003 by Tom Schouten
*
* 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.
*/
#include <m_pd.h>
#include <math.h>
#define CLIP 0
#define INVERSE 1
#define INVERSESQ 2
#define INVERSECUB 3
#define RAT1 4
#define RAT2 5
#define FULLRECT 6
#define HALFRECT 7
#define PULSE 8
#define NEWTON1 9
#define UPPERCLIP 10
#define COMPARATOR 11
typedef struct distctl
{
t_float c_gain;
t_float c_delay;
char c_type;
} t_distctl;
typedef struct dist
{
t_object x_obj;
t_float x_f;
t_distctl x_ctl;
} t_dist;
void dist_bang(t_dist *x)
{
}
void dist_gain(t_dist *x, t_floatarg f)
{
x->x_ctl.c_gain = f;
}
static t_int *dist_perform(t_int *w)
{
t_float *in = (float *)(w[3]);
t_float *out = (float *)(w[4]);
t_distctl *ctl = (t_distctl *)(w[1]);
t_float gain = ctl->c_gain;
t_int i;
t_int n = (t_int)(w[2]);
t_float x,y,v;
t_float z = ctl->c_delay;
switch(ctl->c_type){
case CLIP:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x > 1) ? ( 1.) : x;
x = (x < -1) ? (-1.) : x;
*out++ = 0.9999 * x;
}
break;
case INVERSE:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x > 1) ? (2. - 1/x) : x;
x = (x < -1) ? (-2. - 1/x) : x;
*out++ = x/2.0001;
}
break;
case INVERSESQ:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x > 1) ? (2. - 1/x) : x;
x = (x < -1) ? (-2. - 1/x) : x;
x /= 2;
*out++ = 1.999*x*x-1;
}
break;
case INVERSECUB:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x > 1) ? (2. - 1/x) : x;
x = (x < -1) ? (-2. - 1/x) : x;
x /= 2;
*out++ = .9999 * x*x*x;
}
break;
case RAT1: /*(2*d./((1+(d).^2)))*/
for (i = 0; i < n; i++)
{
x = *in++ * gain;
y = (1. + x*x);
x = 1.9999*x/y;
*out++ = x;
}
break;
case RAT2: /*(2*d./((1+(d).^16)))*/
for (i = 0; i < n; i++)
{
x = *in++ * gain;
y = x*x;
y *= y;
y *= y;
y *= y;
y = (1. + y);
x = 1.2*x/y;
*out++ = x;
}
break;
case FULLRECT:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x>0) ? x : -x;
x = (x>1) ? 1 : x;
*out++ = 1.9999*(x-.5);
}
break;
case HALFRECT:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x>0) ? x : 0;
x = (x>1) ? 1 : x;
*out++ = 1.9999*(x-.5);
}
break;
case PULSE:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
y = (x>0) ? (1):(-1);
x = (z*y > 0) ? (0) : (y);
*out++ = .9999 * x;
z = x;
}
ctl->c_delay = z;
break;
case NEWTON1:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
y = 1./(1.+x*x);
z = .5;
z = .5*(y/z + z);
z = .5*(y/z + z);
z = .5*(y/z + z);
/* z = .5*(y/z + z);
* z = .5*(y/z + z);
* z = .5*(y/z + z);
*/
*out++ = x * z;
}
ctl->c_delay = z;
break;
case UPPERCLIP:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x < 0.0f) ? 0.0f : x;
x = (x > 0.9999f) ? 0.9999f : x;
*out++ = x;
}
break;
case COMPARATOR:
for (i = 0; i < n; i++)
{
x = *in++ * gain;
x = (x > 0.0f) ? 1.0f : -1.0f;
*out++ = x;
}
break;
default:
for (i = 0; i < n; i++) *out++ = *in++;
break;
}
return (w+5);
}
static void dist_dsp(t_dist *x, t_signal **sp)
{
dsp_add(dist_perform, 4, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
void dist_free(void)
{
}
t_class *dist_class;
void *dist_new(t_floatarg type)
{
t_dist *x = (t_dist *)pd_new(dist_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("gain"));
outlet_new(&x->x_obj, gensym("signal"));
dist_gain(x, 1);
x->x_ctl.c_type = (char)type;
x->x_ctl.c_delay = 0;
return (void *)x;
}
void dist_tilde_setup(void)
{
//post("dist~ v0.1");
dist_class = class_new(gensym("dist~"), (t_newmethod)dist_new,
(t_method)dist_free, sizeof(t_dist), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(dist_class, t_dist, x_f);
class_addmethod(dist_class, (t_method)dist_bang, gensym("bang"), 0);
class_addmethod(dist_class, (t_method)dist_dsp, gensym("dsp"), 0);
class_addmethod(dist_class, (t_method)dist_gain, gensym("gain"), A_FLOAT, 0);
}
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