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/* Copyright (c) 1997-2003 Miller Puckette, krzYszcz, and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* This is a compilation of phasor~ and noise~ code from d_osc.c. */
#include "m_pd.h"
#include "shared.h"
#include "sickle/sic.h"
typedef struct _rand
{
t_sic x_sic;
double x_lastphase;
double x_nextphase;
float x_rcpsr;
int x_state;
float x_target;
float x_scaling; /* LATER use phase increment */
} t_rand;
static t_class *rand_class;
static t_int *rand_perform(t_int *w)
{
t_rand *x = (t_rand *)(w[1]);
int nblock = (int)(w[2]);
t_float *rin = (t_float *)(w[3]);
t_float *out = (t_float *)(w[4]);
double lastph = x->x_lastphase;
double ph = x->x_nextphase;
double tfph = ph + SHARED_UNITBIT32;
t_shared_wrappy wrappy;
int32 normhipart;
float rcpsr = x->x_rcpsr;
float target = x->x_target;
float scaling = x->x_scaling;
wrappy.w_d = SHARED_UNITBIT32;
normhipart = wrappy.w_i[SHARED_HIOFFSET];
while (nblock--)
{
float rate = *rin++;
if (ph > lastph)
{
int state = x->x_state;
float newtarget = ((float)((state & 0x7fffffff) - 0x40000000))
* (float)(1.0 / 0x40000000);
x->x_state = state * 435898247 + 382842987;
x->x_scaling = scaling = target - newtarget;
x->x_target = target = newtarget;
}
*out++ = ph * scaling + target;
lastph = ph;
if (rate > 0) rate = -rate;
tfph += rate * rcpsr;
wrappy.w_d = tfph;
wrappy.w_i[SHARED_HIOFFSET] = normhipart;
ph = wrappy.w_d - SHARED_UNITBIT32;
}
x->x_lastphase = lastph;
x->x_nextphase = ph;
return (w + 5);
}
static void rand_dsp(t_rand *x, t_signal **sp)
{
x->x_rcpsr = 1. / sp[0]->s_sr;
dsp_add(rand_perform, 4, x, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
static void *rand_new(t_floatarg f)
{
t_rand *x = (t_rand *)pd_new(rand_class);
/* borrowed from d_osc.c, LATER rethink */
static int init = 307;
x->x_state = (init *= 1319);
x->x_lastphase = 0.;
x->x_nextphase = 1.; /* start from 0, force retargetting */
x->x_target = x->x_scaling = 0;
sic_newinlet((t_sic *)x, (f > 0. ? -f : 0.));
outlet_new((t_object *)x, &s_signal);
return (x);
}
void rand_tilde_setup(void)
{
rand_class = class_new(gensym("rand~"),
(t_newmethod)rand_new, 0,
sizeof(t_rand), 0,
A_DEFFLOAT, 0);
sic_setup(rand_class, rand_dsp, SIC_FLOATTOSIGNAL);
}
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