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/*
* ramp.c - retriggerable counter for dsp signals
* Copyright (c) 2000-2003 by Tom Schouten
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "m_pd.h"
#include <math.h>
typedef struct rampctl
{
t_float c_offset;
t_int c_blockscale;
} t_rampctl;
typedef struct ramp
{
t_object x_obj;
t_float x_f;
t_rampctl x_ctl;
} t_ramp;
void ramp_offset(t_ramp *x, t_floatarg f)
{
x->x_ctl.c_offset = f;
}
void ramp_bang(t_ramp *x)
{
ramp_offset(x, 0);
}
static t_int *ramp_perform(t_int *w)
{
t_float *out = (float *)(w[3]);
t_rampctl *ctl = (t_rampctl *)(w[1]);
t_int i;
t_int n = (t_int)(w[2]);
t_float x;
t_float scale = ctl->c_blockscale ? 1.0f / (float)n : 1.0f;
x = ctl->c_offset;
for (i = 0; i < n; i++)
{
*out++ = ((float)x++) * scale;
}
ctl->c_offset = x; /* save state */
return (w+4);
}
static void ramp_dsp(t_ramp *x, t_signal **sp)
{
dsp_add(ramp_perform, 3, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec);
}
void ramp_free(void)
{
}
t_class *ramp_class;
void *ramp_new(void)
{
t_ramp *x = (t_ramp *)pd_new(ramp_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_ctl.c_blockscale = 0;
ramp_bang(x);
return (void *)x;
}
void *blockramp_new(void)
{
t_ramp *x = (t_ramp *)ramp_new();
x->x_ctl.c_blockscale = 1;
return (void *)x;
}
void ramp_tilde_setup(void)
{
//post("ramp~ v0.1");
ramp_class = class_new(gensym("ramp~"), (t_newmethod)ramp_new,
(t_method)ramp_free, sizeof(t_ramp), 0, 0);
class_addcreator((t_newmethod)blockramp_new, gensym("blockramp~"), A_NULL);
class_addmethod(ramp_class, (t_method)ramp_bang, gensym("bang"), 0);
class_addmethod(ramp_class, (t_method)ramp_dsp, gensym("dsp"), 0);
class_addfloat(ramp_class, (t_method)ramp_offset);
}
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