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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
iemlib2 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2006 */
#include "m_pd.h"
#include "iemlib.h"
/* ------------------------ transf_fader ----------------------- */
/* -- this loopkup tabel objekt makes a 2-point interpolation -- */
/* --------- between the pairs of determinating points --------- */
typedef struct _transf_fader
{
t_object x_obj;
int x_size;
int x_message;
t_float *x_array;
} t_transf_fader;
static t_class *transf_fader_class;
static void transf_fader_pairs(t_transf_fader *x, t_symbol *s, int argc, t_atom *argv)
{
if(argc >= 4)
{
int i, j, k, ac=argc/2;
int n=1000;
int i_prev=0;
int first=1;
int i_delta;
t_float val_delta;
t_float delta;
t_float val_prev=0.0f;
t_float val=0.0f;
t_float *vec=x->x_array;
t_float fad_in, fad_out;
for(j=0; j<n; j++)
{
vec[j] = -123456.0f;
}
for(j=0; j<ac; j++)
{
fad_in = atom_getfloat(argv++);
while(fad_in < 0.0f)
fad_in = 0.0f;
while(fad_in > 1000.0f)
fad_in = 1000.0f;
fad_out = atom_getfloat(argv++);
while(fad_out < -123455.0f)
fad_out = -123455.0f;
i = (int)fad_in;
vec[i] = fad_out;
}
for(j=0; j<n; j++)
{
if(vec[j] > -123456.0f)
{
if(first)
{
first = 0;
i_prev = j;
val_prev = vec[j];
}
else
{
i = j;
val = vec[j];
i_delta = i - i_prev;
val_delta = val - val_prev;
if(i_delta > 1)
{
delta = val_delta / (t_float)i_delta;
for(k=i_prev+1; k<i; k++)
{
vec[k] = val_prev + delta*(t_float)(k - i_prev);
}
}
i_prev = i;
val_prev = val;
}
}
}
}
else
{
if(x->x_message)
post("transf_fader-ERROR: less than 2 pairs make no sense");
}
}
static void transf_fader_float(t_transf_fader *x, t_floatarg fad_in)
{
t_float fad_out;
t_float *vec=x->x_array;
t_float fract;
int i;
while(fad_in < 0.0f)
fad_in = 0.0f;
while(fad_in > 999.0f)
fad_in = 999.0f;
i = (int)fad_in;
fract = fad_in - (t_float)i;
fad_out = vec[i] + fract*(vec[i+1] - vec[i]);
if(fad_out > -123455.0f)
outlet_float(x->x_obj.ob_outlet, fad_out);
}
static void transf_fader_free(t_transf_fader *x)
{
freebytes(x->x_array, x->x_size * sizeof(t_float));
}
static void *transf_fader_new(t_symbol *s, int argc, t_atom *argv)
{
t_transf_fader *x = (t_transf_fader *)pd_new(transf_fader_class);
int i, n;
x->x_size = 1001;
x->x_message = 0;
x->x_array = (t_float *)getbytes(x->x_size * sizeof(t_float));
n = x->x_size;
for(i=0; i<n; i++)
x->x_array[i] = -123456.0f;
transf_fader_pairs(x, gensym("pairs"), argc, argv);
x->x_message = 1;
outlet_new(&x->x_obj, &s_float);
return (x);
}
void transf_fader_setup(void)
{
transf_fader_class = class_new(gensym("transf_fader"), (t_newmethod)transf_fader_new, (t_method)transf_fader_free,
sizeof(t_transf_fader), 0, A_GIMME, 0);
class_addfloat(transf_fader_class, (t_method)transf_fader_float);
class_addmethod(transf_fader_class, (t_method)transf_fader_pairs, gensym("pairs"), A_GIMME, 0);
// class_sethelpsymbol(transf_fader_class, gensym("iemhelp/help-transf_fader"));
}
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