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#include "defines.h"
/*--------------- vlrange -----------------------*/
/* leaky range of each element in a list */
/* arguments: [halfdecay] */
static t_class *vlrange_class;
typedef struct _vlrange
{
t_object x_obj;
float m_c_leak;
float m_leak;
float *m_min;
float *m_max;
int m_n;
} t_vlrange;
static void vlrange_perform(t_vlrange *x, t_symbol *s, int argc, t_atom *argv)
{
int i;
t_atom *ap,*app;
float *fmin, *fmax;
float m_leak;
float m_c_leak;
m_leak=x->m_leak;
m_c_leak=x->m_c_leak;
if (argc!=x->m_n)
{
int i;
if (x->m_min)
{
freebytes(x->m_min,x->m_n);
freebytes(x->m_max,x->m_n);
}
x->m_min=(float*)getbytes(argc*sizeof(float));
x->m_max=(float*)getbytes(argc*sizeof(float));
for(i=0;i<argc;i++)
{
x->m_min[i]=0.0f;
x->m_max[i]=0.0f;
}
x->m_n=argc;
}
fmin=x->m_min;
fmax=x->m_max;
ap = (t_atom *)getbytes(sizeof(t_atom)*argc);
app=ap;
for (i = 0; i < argc; i++)
{
float f=atom_getfloat(argv++);
*fmax =(f > *fmax ) ? f : *fmax *m_c_leak + f*m_leak;
*fmin =(f < *fmin ) ? f : *fmin *m_c_leak + f*m_leak;
SETFLOAT(app, *fmax-*fmin);
app++;
fmax++;
fmin++;
}
outlet_list(x->x_obj.ob_outlet,gensym("list"),argc,ap);
freebytes(ap,argc);
}
static void vlrange_setHalfDecay(t_vlrange *x, t_floatarg halfDecayTime)
{
x->m_c_leak=(float)powf(.5,(1.0f/halfDecayTime));
x->m_leak=1.0f-x->m_c_leak;
}
static void *vlrange_new(t_float halfDecayTime)
{
t_vlrange *x=(t_vlrange *)pd_new(vlrange_class);
outlet_new(&x->x_obj, gensym("list"));
vlrange_setHalfDecay(x, halfDecayTime);
x->m_n=0;
x->m_min=0;
x->m_max=0;
return (void *)x;
}
static void vlrange_free(t_vlrange *x)
{
freebytes(x->m_max,x->m_n);
freebytes(x->m_min,x->m_n);
}
void vlrange_setup(void)
{
vlrange_class = class_new(gensym("vlrange"),
(t_newmethod)vlrange_new, (t_method)vlrange_free,
sizeof(t_vlrange),
CLASS_DEFAULT,
A_DEFFLOAT, 0);
class_addmethod(vlrange_class, (t_method)vlrange_setHalfDecay,
gensym("decay"), A_DEFFLOAT, NULL);
class_addlist(vlrange_class, (t_method)vlrange_perform);
}
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