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#include "defines.h"
/*--------------- lrange ---------------*/
static t_class *lrange_class;
typedef struct _lrange
{
t_object x_obj;
float m_min;
float m_max;
float m_c_leak;
float m_leak;
} t_lrange;
static void lrange_perform(t_lrange *x, t_float in)
{
x->m_max=(in > x->m_max) ? in : x->m_max * x->m_c_leak + in * x->m_leak;
x->m_min=(in < x->m_min) ? in : x->m_min * x->m_c_leak + in * x->m_leak;
outlet_float(x->x_obj.ob_outlet, x->m_max-x->m_min);
}
static void lrange_setHalfDecay(t_lrange *x, t_float halfDecayTime)
{
x->m_c_leak=(float)powf(.5,(1.0f/halfDecayTime));
x->m_leak=1.0f-x->m_c_leak;
}
static void lrange_clear(t_lrange *x)
{
x->m_max = - MAXFLOAT;
x->m_min = MAXFLOAT;
}
static void *lrange_new( t_float halfDecayTime)
{
t_lrange *x=(t_lrange *)pd_new(lrange_class);
outlet_new(&x->x_obj, gensym("float"));
lrange_setHalfDecay(x, halfDecayTime);
lrange_clear(x);
return (void *)x;
}
void lrange_setup(void)
{
lrange_class = class_new(gensym("lrange"),
(t_newmethod)lrange_new, 0,
sizeof(t_lrange),
CLASS_DEFAULT,
A_DEFFLOAT, 0);
class_addfloat(lrange_class, (t_method)lrange_perform);
class_addmethod(lrange_class, (t_method)lrange_clear,
gensym("clear"), A_GIMME, NULL);
class_addmethod(lrange_class, (t_method)lrange_setHalfDecay,
gensym("decay"), A_DEFFLOAT, NULL);
}
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