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/******************************************************
*
* zexy - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 1999:forum::für::umläute:2004
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
/*
1110:forum::für::umläute:1999
*/
#include "zexy.h"
/* ------------------------ blockmirror~ ----------------------------- */
/* mirrors a signalblock around it's center:
{x[0], x[1], ... x[n-1]} --> {x[n-1], x[n-2], ... x[0]}
*/
static t_class *blockmirror_class;
typedef struct _blockmirror
{
t_object x_obj;
int doit;
int blocksize;
t_float *blockbuffer;
} t_blockmirror;
static void blockmirror_float(t_blockmirror *x, t_floatarg f)
{
x->doit = (f != 0);
}
static t_int *blockmirror_perform(t_int *w)
{
t_blockmirror *x = (t_blockmirror *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
if (x->doit) {
if (in==out){
int N=n;
t_float *dummy=x->blockbuffer;
while(n--)*dummy++=*in++;
dummy--;
while(N--)*out++=*dummy--;
} else {
in+=n-1;
while(n--)*out++=*in--;
}
} else while (n--) *out++ = *in++;
return (w+5);
}
static void blockmirror_dsp(t_blockmirror *x, t_signal **sp)
{
if (x->blocksize<sp[0]->s_n){
if(x->blockbuffer)freebytes(x->blockbuffer, sizeof(t_float)*x->blocksize);
x->blocksize = sp[0]->s_n;
x->blockbuffer = getbytes(sizeof(t_float)*x->blocksize);
}
dsp_add(blockmirror_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void blockmirror_helper(t_blockmirror*x)
{
post("\n%c blockmirror~-object for reverting a signal", HEARTSYMBOL);
post("'help' : view this\n"
"signal~");
post("outlet : signal~");
}
static void blockmirror_free(t_blockmirror*x)
{
if(x->blockbuffer)
freebytes(x->blockbuffer, sizeof(t_float)*x->blocksize);
x->blockbuffer=0;
}
static void *blockmirror_new(void)
{
t_blockmirror *x = (t_blockmirror *)pd_new(blockmirror_class);
outlet_new(&x->x_obj, gensym("signal"));
x->doit = 1;
x->blocksize=0;
return (x);
}
void blockmirror_tilde_setup(void)
{
blockmirror_class = class_new(gensym("blockmirror~"), (t_newmethod)blockmirror_new,
(t_method)blockmirror_free,
sizeof(t_blockmirror), 0, A_NULL);
class_addmethod(blockmirror_class, nullfn, gensym("signal"), 0);
class_addmethod(blockmirror_class, (t_method)blockmirror_dsp, gensym("dsp"), 0);
class_addfloat(blockmirror_class, blockmirror_float);
class_addmethod(blockmirror_class, (t_method)blockmirror_helper, gensym("help"), 0);
zexy_register("blockmirror~");
}
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