From d6b088044e161a27d49df537bbb6d998a8d0e50d Mon Sep 17 00:00:00 2001 From: musil Date: Sat, 9 Dec 2006 02:00:52 +0000 Subject: // class_sethelpsymbol(); changed help-*.pd to *-help.pd chanded file structure to standard 1st step remove old svn path=/trunk/externals/iemlib/; revision=6756 --- iemlib2/src/LFO_noise~.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) create mode 100644 iemlib2/src/LFO_noise~.c (limited to 'iemlib2/src/LFO_noise~.c') diff --git a/iemlib2/src/LFO_noise~.c b/iemlib2/src/LFO_noise~.c new file mode 100644 index 0000000..f07ffbe --- /dev/null +++ b/iemlib2/src/LFO_noise~.c @@ -0,0 +1,122 @@ +/* For information on usage and redistribution, and for a DISCLAIMER OF ALL +* WARRANTIES, see the file, "LICENSE.txt," in this distribution. + +iemlib2 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2006 */ + + +#include "m_pd.h" +#include "iemlib.h" + + +/* -------------------- LFO_noise~ --------------------- */ +/* ---- outputs a 2 point interpolated white noise ----- */ +/* -- with lower cutoff frequency than 0.5 samplerate -- */ + +static t_class *LFO_noise_tilde_class; + +typedef struct _LFO_noise_tilde +{ + t_object x_obj; + double x_range; + double x_rcp_range; + unsigned int x_state; + t_float x_fact; + t_float x_incr; + t_float x_y1; + t_float x_y2; + t_float x_phase; +} t_LFO_noise_tilde; + +static int LFO_noise_tilde_makeseed(void) +{ + static unsigned int LFO_noise_tilde_nextseed = 1489853723; + + LFO_noise_tilde_nextseed = LFO_noise_tilde_nextseed * 435898247 + 938284287; + return(LFO_noise_tilde_nextseed & 0x7fffffff); +} + +static float LFO_noise_tilde_new_rand(t_LFO_noise_tilde *x) +{ + unsigned int state = x->x_state; + double new_val, range = x->x_range; + + x->x_state = state = state * 472940017 + 832416023; + new_val = range * ((double)state) * (1./4294967296.); + if(new_val >= range) + new_val = range-1; + new_val -= 32767.0; + return(new_val*(1.0/32767.0)); +} + +static void *LFO_noise_tilde_new(t_float freq) +{ + t_LFO_noise_tilde *x = (t_LFO_noise_tilde *)pd_new(LFO_noise_tilde_class); + + x->x_range = 65535.0; + x->x_rcp_range = (double)x->x_range * (1.0/4294967296.0); + x->x_state = LFO_noise_tilde_makeseed(); + x->x_fact = 2.0f / 44100.0f; + x->x_incr = freq * x->x_fact; + if(x->x_incr < 0.0f) + x->x_incr = 0.0f; + else if(x->x_incr > 0.1f) + x->x_incr = 0.1f; + x->x_y1 = LFO_noise_tilde_new_rand(x); + x->x_y2 = LFO_noise_tilde_new_rand(x); + x->x_phase = 0.0f; + outlet_new(&x->x_obj, gensym("signal")); + return (x); +} + +static t_int *LFO_noise_tilde_perform(t_int *w) +{ + t_float *out = (t_float *)(w[1]); + t_LFO_noise_tilde *x = (t_LFO_noise_tilde *)(w[2]); + int n = (int)(w[3]); + t_float phase = x->x_phase; + t_float x_y1 = x->x_y1; + t_float x_y2 = x->x_y2; + t_float incr = x->x_incr; + + while(n--) + { + if(phase > 1.0f) + { + x_y1 = x_y2; + x_y2 = LFO_noise_tilde_new_rand(x); + phase -= 1.0; + } + *out++ = (x_y2 - x_y1) * phase + x_y1; + phase += incr; + } + x->x_phase = phase; + x->x_y1 = x_y1; + x->x_y2 = x_y2; + return (w+4); +} + +static void LFO_noise_tilde_float(t_LFO_noise_tilde *x, t_floatarg freq) +{ + x->x_incr = freq * x->x_fact; + if(x->x_incr < 0.0f) + x->x_incr = 0.0f; + else if(x->x_incr > 0.1f) + x->x_incr = 0.1f; +} + +static void LFO_noise_tilde_dsp(t_LFO_noise_tilde *x, t_signal **sp) +{ + x->x_fact = 2.0f / sp[0]->s_sr; + dsp_add(LFO_noise_tilde_perform, 3, sp[0]->s_vec, x, sp[0]->s_n); +} + +void LFO_noise_tilde_setup(void) +{ + LFO_noise_tilde_class = class_new(gensym("LFO_noise~"), + (t_newmethod)LFO_noise_tilde_new, 0, + sizeof(t_LFO_noise_tilde), 0, A_DEFFLOAT, 0); + class_addmethod(LFO_noise_tilde_class, (t_method)LFO_noise_tilde_dsp, + gensym("dsp"), 0); + class_addfloat(LFO_noise_tilde_class, (t_method)LFO_noise_tilde_float); +// class_sethelpsymbol(LFO_noise_tilde_class, gensym("iemhelp/help-LFO_noise~")); +} -- cgit v1.2.1