#include <m_pd.h>
#include <m_fixed.h>

typedef struct sigsamphold
{
    t_object x_obj;
    t_sample x_f;
    t_sample x_lastin;
    t_sample x_lastout;
} t_sigsamphold;

t_class *sigsamphold_class;

static void *sigsamphold_new(void)
{
    t_sigsamphold *x = (t_sigsamphold *)pd_new(sigsamphold_class);
    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
    outlet_new(&x->x_obj, gensym("signal"));
    x->x_lastin = 0;
    x->x_lastout = 0;
    x->x_f = 0;
    return (x);
}

static t_int *sigsamphold_perform(t_int *w)
{
    t_sample *in1 = (t_sample *)(w[1]);
    t_sample *in2 = (t_sample *)(w[2]);
    t_sample *out = (t_sample *)(w[3]);
    t_sigsamphold *x = (t_sigsamphold *)(w[4]);
    int n = (t_int)(w[5]);
    int i;
    t_sample lastin = x->x_lastin;
    t_sample lastout = x->x_lastout;
    for (i = 0; i < n; i++, *in1++)
    {
    	t_sample next = *in2++;
    	if (next < lastin) lastout = *in1;
    	*out++ = lastout;
    	lastin = next;
    }
    x->x_lastin = lastin;
    x->x_lastout = lastout;
    return (w+6);
}

static void sigsamphold_dsp(t_sigsamphold *x, t_signal **sp)
{
    dsp_add(sigsamphold_perform, 5,
	sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, 
	    x, sp[0]->s_n);
}

static void sigsamphold_reset(t_sigsamphold *x)
{
    x->x_lastin = 0x7fffffff;
}

static void sigsamphold_set(t_sigsamphold *x, t_float f)
{
    x->x_lastout = f;
}

void samphold_tilde_setup(void)
{
    sigsamphold_class = class_new(gensym("samphold~"),
    	(t_newmethod)sigsamphold_new, 0, sizeof(t_sigsamphold), 0, 0);
    CLASS_MAINSIGNALIN(sigsamphold_class, t_sigsamphold, x_f);
    class_addmethod(sigsamphold_class, (t_method)sigsamphold_set,
    	gensym("set"), A_FLOAT, 0);
    class_addmethod(sigsamphold_class, (t_method)sigsamphold_reset,
    	gensym("reset"), 0);
    class_addmethod(sigsamphold_class, (t_method)sigsamphold_dsp,
    	gensym("dsp"), 0);
}