From 577ac6e80ff4f436fbd054291ed7dddbc31bd49a Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Tue, 18 May 2004 21:33:33 +0000 Subject: This commit was generated by cvs2svn to compensate for changes in r1738, which included commits to RCS files with non-trunk default branches. svn path=/trunk/externals/iemlib/; revision=1739 --- src/iemlib2/sigLFO_noise.c | 129 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 src/iemlib2/sigLFO_noise.c (limited to 'src/iemlib2/sigLFO_noise.c') diff --git a/src/iemlib2/sigLFO_noise.c b/src/iemlib2/sigLFO_noise.c new file mode 100644 index 0000000..3714f5a --- /dev/null +++ b/src/iemlib2/sigLFO_noise.c @@ -0,0 +1,129 @@ +/* Copyright (c) 1997-2003 Miller Puckette. +* 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 (c) IEM KUG Graz Austria 2000 - 2003 */ + +#ifdef NT +#pragma warning( disable : 4244 ) +#pragma warning( disable : 4305 ) +#endif + +#include "m_pd.h" +#include "iemlib.h" +#include +#include +#include +#include + +/* ------------------------ LFO_noise~ ----------------------------- */ + +static t_class *sigLFO_noise_class; + +typedef struct _sigLFO_noise +{ + t_object x_obj; + double x_range; + double x_rcp_range; + unsigned int x_state; + float x_fact; + float x_incr; + float x_y1; + float x_y2; + float x_phase; +} t_sigLFO_noise; + +static int sigLFO_noise_makeseed(void) +{ + static unsigned int sigLFO_noise_nextseed = 1489853723; + + sigLFO_noise_nextseed = sigLFO_noise_nextseed * 435898247 + 938284287; + return(sigLFO_noise_nextseed & 0x7fffffff); +} + +static float sigLFO_noise_new_rand(t_sigLFO_noise *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 *sigLFO_noise_new(t_float freq) +{ + t_sigLFO_noise *x = (t_sigLFO_noise *)pd_new(sigLFO_noise_class); + + x->x_range = 65535.0; + x->x_rcp_range = (double)x->x_range * (1.0/4294967296.0); + x->x_state = sigLFO_noise_makeseed(); + x->x_fact = 2. / 44100.0; + x->x_incr = freq * x->x_fact; + if(x->x_incr < 0.0) + x->x_incr = 0.0; + else if(x->x_incr > 0.1) + x->x_incr = 0.1; + x->x_y1 = sigLFO_noise_new_rand(x); + x->x_y2 = sigLFO_noise_new_rand(x); + x->x_phase = 0.0; + outlet_new(&x->x_obj, gensym("signal")); + return (x); +} + +static t_int *sigLFO_noise_perform(t_int *w) +{ + t_float *out = (t_float *)(w[1]); + t_sigLFO_noise *x = (t_sigLFO_noise *)(w[2]); + int n = (int)(w[3]); + float phase = x->x_phase; + float x_y1 = x->x_y1; + float x_y2 = x->x_y2; + float incr = x->x_incr; + + while(n--) + { + if(phase > 1.0) + { + x_y1 = x_y2; + x_y2 = sigLFO_noise_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 sigLFO_noise_float(t_sigLFO_noise *x, t_float freq) +{ + x->x_incr = freq * x->x_fact; + if(x->x_incr < 0.0) + x->x_incr = 0.0; + else if(x->x_incr > 0.1) + x->x_incr = 0.1; +} + +static void sigLFO_noise_dsp(t_sigLFO_noise *x, t_signal **sp) +{ + x->x_fact = 2. / sp[0]->s_sr; + dsp_add(sigLFO_noise_perform, 3, sp[0]->s_vec, x, sp[0]->s_n); +} + +void sigLFO_noise_setup(void) +{ + sigLFO_noise_class = class_new(gensym("LFO_noise~"), + (t_newmethod)sigLFO_noise_new, 0, + sizeof(t_sigLFO_noise), 0, A_DEFFLOAT, 0); + class_addmethod(sigLFO_noise_class, (t_method)sigLFO_noise_dsp, + gensym("dsp"), 0); + class_addfloat(sigLFO_noise_class, (t_method)sigLFO_noise_float); + class_sethelpsymbol(sigLFO_noise_class, gensym("iemhelp/help-LFO_noise~")); +} + -- cgit v1.2.1