From 086e6b358ad45bda0e6a948cfb7ea2d33ab7da5a Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Wed, 10 Feb 2010 00:34:05 +0000 Subject: re-arranged into libdir and setup with the template Makefile+debian stuff. renabled vv+ and vv- as vvplus and vvminus svn path=/trunk/externals/smlib/; revision=13158 --- lrange.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 lrange.c (limited to 'lrange.c') diff --git a/lrange.c b/lrange.c new file mode 100644 index 0000000..8f5b296 --- /dev/null +++ b/lrange.c @@ -0,0 +1,60 @@ +#include "defines.h" + +/*--------------- lrange ---------------*/ + +static t_class *lrange_class; + +typedef struct _lrange +{ + t_object x_obj; + float m_min; + float m_max; + float m_c_leak; + float m_leak; +} t_lrange; + + +static void lrange_perform(t_lrange *x, t_float in) +{ + x->m_max=(in > x->m_max) ? in : x->m_max * x->m_c_leak + in * x->m_leak; + x->m_min=(in < x->m_min) ? in : x->m_min * x->m_c_leak + in * x->m_leak; + outlet_float(x->x_obj.ob_outlet, x->m_max-x->m_min); +} + +static void lrange_setHalfDecay(t_lrange *x, t_float halfDecayTime) +{ + x->m_c_leak=(float)powf(.5,(1.0f/halfDecayTime)); + x->m_leak=1.0f-x->m_c_leak; +} + +static void lrange_clear(t_lrange *x) +{ + x->m_max = - MAXFLOAT; + x->m_min = MAXFLOAT; +} + +static void *lrange_new( t_float halfDecayTime) +{ + t_lrange *x=(t_lrange *)pd_new(lrange_class); + outlet_new(&x->x_obj, gensym("float")); + + lrange_setHalfDecay(x, halfDecayTime); + lrange_clear(x); + return (void *)x; +} + + +void lrange_setup(void) +{ + lrange_class = class_new(gensym("lrange"), + (t_newmethod)lrange_new, 0, + sizeof(t_lrange), + CLASS_DEFAULT, + A_DEFFLOAT, 0); + class_addfloat(lrange_class, (t_method)lrange_perform); + class_addmethod(lrange_class, (t_method)lrange_clear, + gensym("clear"), A_GIMME, NULL); + class_addmethod(lrange_class, (t_method)lrange_setHalfDecay, + gensym("decay"), A_DEFFLOAT, NULL); +} + -- cgit v1.2.1