From 386b0b74b0133acb7caddc0f31f5ebbf255efc00 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Tue, 10 Nov 2009 01:47:02 +0000 Subject: split out d_math.c into standalone objects svn path=/trunk/; revision=12736 --- externals/vanilla/log~.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 externals/vanilla/log~.c (limited to 'externals/vanilla/log~.c') diff --git a/externals/vanilla/log~.c b/externals/vanilla/log~.c new file mode 100644 index 00000000..0dc5f9fd --- /dev/null +++ b/externals/vanilla/log~.c @@ -0,0 +1,56 @@ +/* Copyright (c) 1997-2001 Miller Puckette and others. +* For information on usage and redistribution, and for a DISCLAIMER OF ALL +* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */ + +#include "m_pd.h" +#include + +static t_class *log_tilde_class; + +typedef struct _log_tilde +{ + t_object x_obj; + t_float x_f; +} t_log_tilde; + +static void *log_tilde_new(t_symbol *s, int argc, t_atom *argv) +{ + t_log_tilde *x = (t_log_tilde *)pd_new(log_tilde_class); + inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal); + outlet_new(&x->x_obj, &s_signal); + x->x_f = 0; + return (x); +} + +t_int *log_tilde_perform(t_int *w) +{ + t_sample *in1 = (t_sample *)(w[1]); + t_sample *in2 = (t_sample *)(w[2]); + t_sample *out = (t_sample *)(w[3]); + int n = (int)(w[4]); + while (n--) + { + float f = *in1++, g = *in2++; + if (f <= 0) + *out = -1000; /* rather than blow up, output a number << 0 */ + else if (g <= 0) + *out = log(f); + else *out = log(f)/log(g); + out++; + } + return (w+5); +} + +static void log_tilde_dsp(t_log_tilde *x, t_signal **sp) +{ + dsp_add(log_tilde_perform, 4, + sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n); +} + +static void log_tilde_setup(void) +{ + log_tilde_class = class_new(gensym("log~"), (t_newmethod)log_tilde_new, 0, + sizeof(t_log_tilde), 0, A_DEFFLOAT, 0); + CLASS_MAINSIGNALIN(log_tilde_class, t_log_tilde, x_f); + class_addmethod(log_tilde_class, (t_method)log_tilde_dsp, gensym("dsp"), 0); +} -- cgit v1.2.1