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/*
* cmath.c - some complex math dsp objects
* 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>
#define MINNORM 0.0000000001
typedef struct cmath
{
t_object x_obj;
t_float x_f;
t_perfroutine x_perf;
} t_cmath;
static t_int *cmath_perform_clog(t_int *w)
{
t_float *inx = (float *)(w[2]);
t_float *iny = (float *)(w[3]);
t_float *outx = (float *)(w[5]); // clockwize addressing
t_float *outy = (float *)(w[4]);
int i;
int n = (int)(w[1]);
t_float x;
while (n--){
float x = *inx++;
float y = *iny++;
float norm = sqrt(x*x + y*y);
float arg = atan2(y, x);
if (norm < MINNORM){
norm = MINNORM;
}
*outx++ = log(norm);
*outy++ = arg;
}
return (w+6);
}
static t_int *cmath_perform_cexp(t_int *w)
{
t_float *inx = (float *)(w[2]);
t_float *iny = (float *)(w[3]);
t_float *outx = (float *)(w[5]); // clockwize addressing
t_float *outy = (float *)(w[4]);
int i;
int n = (int)(w[1]);
t_float x;
while (n--){
float x = *inx++;
float y = *iny++;
float norm = exp(x);
*outx++ = norm * cos(y);
*outy++ = norm * sin(y);
}
return (w+6);
}
static t_int *cmath_perform_nfft(t_int *w)
{
t_float *inx = (float *)(w[2]);
t_float *iny = (float *)(w[3]);
t_float *outx = (float *)(w[5]); // clockwize addressing
t_float *outy = (float *)(w[4]);
int i;
int n = (int)(w[1]);
t_float x;
t_float scale = 1.0f / (sqrt((float)n));
mayer_fft(n, inx, outx);
while (n--){
float x = *inx++;
float y = *iny++;
*outx++ = scale * x;
*outy++ = scale * y;
}
return (w+6);
}
static t_int *cmath_perform_nifft(t_int *w)
{
t_float *inx = (float *)(w[2]);
t_float *iny = (float *)(w[3]);
t_float *outx = (float *)(w[5]); // clockwize addressing
t_float *outy = (float *)(w[4]);
int i;
int n = (int)(w[1]);
t_float x;
t_float scale = 1.0f / (sqrt((float)n));
mayer_ifft(n, inx, outx);
while (n--){
float x = *inx++;
float y = *iny++;
*outx++ = scale * x;
*outy++ = scale * y;
}
return (w+6);
}
static void cmath_dsp(t_cmath *x, t_signal **sp)
{
dsp_add(x->x_perf, 5, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec);
}
void cmath_free(void)
{
}
t_class *cmath_class;
t_cmath *cmath_new_common(void)
{
t_cmath *x = (t_cmath *)pd_new(cmath_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("signal"), gensym("signal"));
outlet_new(&x->x_obj, gensym("signal"));
outlet_new(&x->x_obj, gensym("signal"));
return x;
}
#define DEFNEWCMATH(name, perfmethod) \
void * name (void) \
{ \
t_cmath *x = cmath_new_common(); \
x->x_perf = perfmethod ; \
return (void*)x; \
}
DEFNEWCMATH(cmath_new_clog, cmath_perform_clog)
DEFNEWCMATH(cmath_new_cexp, cmath_perform_cexp)
DEFNEWCMATH(cmath_new_nfft, cmath_perform_nfft)
DEFNEWCMATH(cmath_new_nifft, cmath_perform_nifft)
void cmath_tilde_setup(void)
{
//post("cmath~ v0.1");
cmath_class = class_new(gensym("clog~"), (t_newmethod)cmath_new_clog,
(t_method)cmath_free, sizeof(t_cmath), 0, 0);
class_addcreator((t_newmethod)cmath_new_cexp, gensym("cexp~"), A_NULL);
class_addcreator((t_newmethod)cmath_new_nfft, gensym("nfft~"), A_NULL);
class_addcreator((t_newmethod)cmath_new_nifft, gensym("nifft~"), A_NULL);
CLASS_MAINSIGNALIN(cmath_class, t_cmath, x_f);
class_addmethod(cmath_class, (t_method)cmath_dsp, gensym("dsp"), 0);
}
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