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#include "defines.h"
/*--------------- hip ---------------*/
typedef struct hipctl
{
float c_x;
float c_coef;
} t_hipctl;
typedef struct hip
{
t_object x_obj;
float x_sr;
float x_hz;
t_hipctl x_cspace;
t_hipctl *x_ctl;
float x_f;
} t_hip;
t_class *hip_class;
static void hip_ft1(t_hip *x, t_floatarg f);
static void *hip_new(t_floatarg f)
{
t_hip *x = (t_hip *)pd_new(hip_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
outlet_new(&x->x_obj, gensym("float"));
x->x_ctl = &x->x_cspace;
x->x_cspace.c_x = 0;
hip_ft1(x, f);
x->x_f = 0;
return (x);
}
static void hip_ft1(t_hip *x, t_floatarg f)
{
if (f < 0.001) f = 10;
x->x_hz = f;
x->x_ctl->c_coef = 1 - f * (2 * 3.14159f);
if (x->x_ctl->c_coef < 0) x->x_ctl->c_coef = 0;
}
static void hip_perform(t_hip *x, t_float in)
{
t_hipctl *c = x->x_ctl;
float last = c->c_x;
float coef = c->c_coef;
float out;
float new = in + coef * last;
out = new - last;
last = new;
/* NAN protect */
if (!((last <= 0) || (last >= 0)))
last = 0;
c->c_x = last;
outlet_float(x->x_obj.ob_outlet, out);
}
static void hip_clear(t_hip *x, t_floatarg q)
{
x->x_cspace.c_x = 0;
}
void hip_setup(void)
{
hip_class = class_new(gensym("hip"), (t_newmethod)hip_new, 0,
sizeof(t_hip), 0, A_DEFFLOAT, 0);
class_addfloat(hip_class, (t_method)hip_perform);
class_addmethod(hip_class, (t_method)hip_ft1,
gensym("ft1"), A_FLOAT, 0);
class_addmethod(hip_class, (t_method)hip_clear, gensym("clear"), 0);
}
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