1 files changed, 99 insertions, 0 deletions
diff --git a/source/vlrange.c b/source/vlrange.c
new file mode 100644
index 0000000..07b383f
--- /dev/null
+++ b/source/vlrange.c
@@ -0,0 +1,99 @@
+#include "defines.h"
+
+/*--------------- vlrange -----------------------*/
+/* leaky range of each element in a list     */
+/* arguments: [halfdecay] */
+
+static t_class *vlrange_class;
+
+typedef struct _vlrange
+{
+    t_object x_obj;
+	float m_c_leak;
+	float m_leak;
+	float *m_min;
+	float *m_max;
+	int m_n;
+} t_vlrange;
+
+
+static void vlrange_perform(t_vlrange *x, t_symbol *s, int argc, t_atom *argv)
+{
+	int i;
+	t_atom *ap,*app;
+	float *fmin, *fmax;
+	float m_leak;
+	float m_c_leak;
+	m_leak=x->m_leak;
+	m_c_leak=x->m_c_leak;
+
+	if (argc!=x->m_n)
+	{
+		int i;
+		if (x->m_min)
+		{
+			freebytes(x->m_min,x->m_n);
+			freebytes(x->m_max,x->m_n);
+		}
+		x->m_min=(float*)getbytes(argc*sizeof(float));
+		x->m_max=(float*)getbytes(argc*sizeof(float));
+		for(i=0;i<argc;i++)
+		{
+			x->m_min[i]=0.0f;
+			x->m_max[i]=0.0f;
+		}
+		x->m_n=argc;
+	}
+
+	fmin=x->m_min;
+	fmax=x->m_max;
+    ap = (t_atom *)getbytes(sizeof(t_atom)*argc);
+	app=ap;
+	for (i = 0; i < argc; i++)
+	{
+		float f=atom_getfloat(argv++);
+		*fmax =(f > *fmax ) ? f : *fmax *m_c_leak + f*m_leak;
+		*fmin =(f < *fmin ) ? f : *fmin *m_c_leak + f*m_leak;
+		SETFLOAT(app, *fmax-*fmin);
+		app++;
+		fmax++;
+		fmin++;
+	}
+	outlet_list(x->x_obj.ob_outlet,gensym("list"),argc,ap);
+    freebytes(ap,argc);
+}
+
+static void vlrange_setHalfDecay(t_vlrange *x, t_floatarg halfDecayTime)
+{
+	x->m_c_leak=(float)powf(.5,(1.0f/halfDecayTime));
+	x->m_leak=1.0f-x->m_c_leak;
+}
+
+static void *vlrange_new(t_float halfDecayTime)
+{
+	t_vlrange *x=(t_vlrange *)pd_new(vlrange_class);
+	outlet_new(&x->x_obj, gensym("list"));
+	vlrange_setHalfDecay(x, halfDecayTime);
+	x->m_n=0;
+	x->m_min=0;
+	x->m_max=0;
+	return (void *)x;
+}
+
+static void vlrange_free(t_vlrange *x)
+{
+	freebytes(x->m_max,x->m_n);
+	freebytes(x->m_min,x->m_n);
+}
+
+void vlrange_setup(void)
+{
+    vlrange_class = class_new(gensym("vlrange"),
+    	(t_newmethod)vlrange_new, (t_method)vlrange_free,
+		sizeof(t_vlrange), 
+		CLASS_DEFAULT,
+	    A_DEFFLOAT, 0);
+	class_addmethod(vlrange_class, (t_method)vlrange_setHalfDecay,
+    	gensym("decay"), A_DEFFLOAT, NULL);
+    class_addlist(vlrange_class, (t_method)vlrange_perform);
+}