diff options
Diffstat (limited to 'source/lrange.c')
| -rw-r--r-- | source/lrange.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/source/lrange.c b/source/lrange.c new file mode 100644 index 0000000..8f5b296 --- /dev/null +++ b/source/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);
+}
+
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