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bpbuzz~.c
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#include "shadylib.h"
#include <math.h>
static t_class *bpbuzz_class;
/* this algorithm is mainly from supercollider
should be modified for 16-bit ints;
*/
typedef struct _bpbuzz {
t_object x_obj;
t_float x_f;
float x_duty;
float x_oduty;
double phase;
double dphase;
double d_conv;
double x_conv;
float max;
} t_bpbuzz;
static void bpbuzz_phase(t_bpbuzz *x, t_float f) {
f *= .5f;
x->phase = f - floorf(f);
}
static void *bpbuzz_new(t_symbol* SHADYLIB_UNUSED(s), int argc, t_atom *argv) {
t_bpbuzz *x = (t_bpbuzz *)pd_new(bpbuzz_class);
float oduty = argc ? atom_getfloatarg(0, argc, argv) : 0.5f;
x->phase = 0.0f;
pd_float(
(t_pd *)inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal),
oduty);
x->x_duty = x->x_oduty = 0.495 - 0.49*shadylib_clamp(oduty, 0.0, 1.0);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("phase"));
outlet_new(&x->x_obj, &s_signal);
outlet_new(&x->x_obj, &s_signal);
outlet_new(&x->x_obj, &s_signal);
x->x_f = 0;
return (x);
}
static t_int *bpbuzz_perform(t_int *w) {
t_bpbuzz *x = (t_bpbuzz *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *in2 = (t_sample *)(w[3]);
t_sample *out1 = (t_sample *)(w[4]);
t_sample *out2 = (t_sample *)(w[5]);
t_sample *out3 = (t_sample *)(w[6]);
int n = (int)(w[7]);
double conv = x->x_conv, dconv = x->d_conv;
double phase = x->phase, dphase = x->dphase;
double rat, frat, res1, res2, res3, res4, fread;
double freq, final, max = x->max, duty = x->x_duty, oduty = x->x_oduty;
uint32_t tabrd, tabrd2, n2;
for(int i=0; i < n; i++) {
freq = shadylib_pdfloat_abs(*in++);
freq = shadylib_min(freq, max);
fread = phase*SHADYLIB_BUZZSIZE;
tabrd = fread;
tabrd2 = tabrd + 1;
res1 = shadylib_cosectbl[tabrd];
res2 = shadylib_cosectbl[tabrd2];
res3 = fread - tabrd;
if(res1 == SHADYLIB_BADVAL || res2 == SHADYLIB_BADVAL) {
res1 = shadylib_sintbl[tabrd];
res2 = shadylib_sintbl[tabrd2];
#ifdef FP_FAST_FMA
res2 = fma(res2 - res1, res3, res1);
#else
res2 = res1 + (res2 - res1)*res3;
#endif
if(fabs(res2) < 0.0005) {
final = 1.0;
rat = shadylib_clamp(max/freq, 1.0, SHADYLIB_MAXHARM);
n2 = rat;
n2 *= 2;
goto gotfinal;
} else res2 = 1.0/res2;
} else {
#ifdef FP_FAST_FMA
res2 = fma(res2 - res1, res3, res1);
#else
res2 = res1 + (res2 - res1)*res3;
#endif
}
rat = max/freq - 1.0;
rat = shadylib_clamp(rat, 1.0, SHADYLIB_MAXHARM);
n2 = rat;
frat = rat - n2;
n2 *= 2;
#ifdef FP_FAST_FMA
res4 = fma(n2, fread, fread);
#else
res4 = fread*n2 + fread;
#endif
tabrd = res4;
res1 = res4 - tabrd;
tabrd = tabrd & (SHADYLIB_BUZZSIZE - 1);
res3 = shadylib_sintbl[tabrd];
tabrd++;
#ifdef FP_FAST_FMA
res3 = fma(shadylib_sintbl[tabrd] - res3, res1, res3);
res3 = fma(res3, res2, -1)/n2;
res1 = fma(fread, 2, res4);
#else
res3 = res3 + (shadylib_sintbl[tabrd] - res3)*res1;
res3 = (res3*res2 - 1.0)/n2;
res1 = res4 + fread*2.0;
#endif
/* crossfade to last harmonic */
tabrd = res1;
res4 = res1 - tabrd;
tabrd = tabrd & (SHADYLIB_BUZZSIZE - 1);
res1 = shadylib_sintbl[tabrd];
tabrd++;
#ifdef FP_FAST_FMA
res1 = fma(shadylib_sintbl[tabrd] - res1, res4, res1);
res1 = fma(res1, res2, -1)/(n2 + 2);
final = fma(res3, 1-frat, res1*frat);
#else
res1 = res1 + (shadylib_sintbl[tabrd] - res1)*res4;
res1 = (res1*res2 - 1.0)/(n2 + 2);
final = res3*(1.0 - frat) + res1*frat;
#endif
gotfinal:
if(freq == 0.0) {
res3 = 0.0;
rat = phase + oduty + dphase;
goto gotfinal2;
}
rat = max*(1.0 - ((1.0 - 2.0*dconv)*dconv))/freq - 1.0;
rat = shadylib_clamp(rat, 1.0, SHADYLIB_MAXHARM);
n2 = rat;
frat = rat - n2;
n2 *= 2;
fread = rat = phase + oduty + dphase;
// first wrap between 0 and 1 so 32 bit
// ints can take maxharm
tabrd = fread;
fread = fread - tabrd;
fread *= SHADYLIB_BUZZSIZE;
tabrd = fread;
tabrd = tabrd & (SHADYLIB_BUZZSIZE - 1);
res3 = fread - tabrd;
tabrd2 = tabrd + 1;
res1 = shadylib_cosectbl[tabrd];
res2 = shadylib_cosectbl[tabrd2];
if(res1 == SHADYLIB_BADVAL || res2 == SHADYLIB_BADVAL) {
res1 = shadylib_sintbl[tabrd];
res2 = shadylib_sintbl[tabrd2];
res2 = res1 + (res2 - res1)*res3;
if(fabs(res2) < 0.0005) {
res3 = 1.0;
goto gotfinal2;
} else res2 = 1.0/res2;
} else {
#ifdef FP_FAST_FMA
res2 = fma(res2 - res1, res3, res1);
#else
res2 = res1 + (res2 - res1)*res3;
#endif
}
#ifdef FP_FAST_FMA
res4 = fma(n2, fread, fread);
#else
res4 = fread*n2 + fread;
#endif
tabrd = res4;
res1 = res4 - tabrd;
tabrd = tabrd & (SHADYLIB_BUZZSIZE - 1);
res3 = shadylib_sintbl[tabrd];
tabrd++;
#ifdef FP_FAST_FMA
res3 = fma(shadylib_sintbl[tabrd] - res3, res1, res3);
res3 = fma(res3, res2, -1)/n2;
res1 = fma(fread, 2, res4);
#else
res3 = res3 + (shadylib_sintbl[tabrd] - res3)*res1;
res3 = (res3*res2 - 1.0)/n2;
res1 = res4 + fread*2.0;
#endif
/* crossfade to last harmonic */
tabrd = res1;
res4 = res1 - tabrd;
tabrd = tabrd & (SHADYLIB_BUZZSIZE - 1);
res1 = shadylib_sintbl[tabrd];
tabrd++;
#ifdef FP_FAST_FMA
res1 = fma(shadylib_sintbl[tabrd] - res1, res4, res1);
res1 = fma(res1, res2, -1)/(n2 + 2);
res3 = fma(res3, 1-frat, res1*frat);
#else
res1 = res1 + (shadylib_sintbl[tabrd] - res1)*res4;
res1 = (res1*res2 - 1.0)/(n2 + 2);
res3 = res3*(1.0 - frat) + res1*frat;
#endif
gotfinal2:
n2 = rat*2.0;
res2 = freq*conv;
phase += res2;
dphase += res2*dconv;
res1 = phase + oduty + dphase;
tabrd = res1*2.0;
/* calculate phase offset for bp */
if(tabrd > n2) {
dphase = dphase - duty + oduty;
oduty = duty;
duty = shadylib_clamp(*in2, 0.0, 1.0);
#ifdef FP_FAST_FMA
duty = fma(duty, -0.49, .495);
#else
duty = 0.495 - 0.49*duty;
#endif
dconv = duty - oduty - dphase;
dconv = (dconv)/(0.5 - dconv);
}
in2++;
n2 = phase;
phase = phase - n2;
*out1++ = (final - res3);
*out2++ = final;
*out3++ = phase;
}
x->phase = phase, x->dphase = dphase;
x->d_conv = dconv;
x->x_duty = duty, x->x_oduty = oduty;
return(w + 8);
}
static void bpbuzz_dsp(t_bpbuzz *x, t_signal **sp)
{
x->x_conv = 0.5/sp[0]->s_sr;
x->max = sp[0]->s_sr*0.5;
dsp_add(bpbuzz_perform, 7, x, sp[0]->s_vec, sp[1]->s_vec,
sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec, sp[0]->s_n);
}
void bpbuzz_tilde_setup(void)
{
bpbuzz_class = class_new(gensym("bpbuzz~"), (t_newmethod)bpbuzz_new, 0,
sizeof(t_bpbuzz), 0, A_GIMME, 0);
class_addmethod(bpbuzz_class, (t_method)bpbuzz_dsp, gensym("dsp"), A_CANT, 0);
CLASS_MAINSIGNALIN(bpbuzz_class, t_bpbuzz, x_f);
class_addmethod(bpbuzz_class, (t_method)bpbuzz_phase,
gensym("phase"), A_FLOAT, 0);
class_setfreefn(bpbuzz_class, shadylib_freebuzz);
shadylib_makebuzz();
}