1 files changed, 83 insertions, 0 deletions
diff --git a/source/ustep~.c b/source/ustep~.c
new file mode 100644
index 0000000..d91ea1f
--- /dev/null
+++ b/source/ustep~.c
@@ -0,0 +1,83 @@
+/* sIgpAck
+ * for
+ * pure-data
+ * www.weiss-archiv.de */
+
+#include "m_pd.h"
+#ifdef _MSC_VER
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+/* ------------------------ sp.ustep~ ----------------------------- */
+/* signal unity step function */
+
+static t_class *ustep_tilde_class;
+
+typedef struct _ustep_tilde
+{
+    t_object x_obj;
+	t_sample x_mode;
+	t_sample x_thres;
+	float x_f;
+} t_ustep_tilde;
+
+static void *ustep_tilde_new(t_floatarg mode, t_floatarg thres)
+{
+    t_ustep_tilde *x = (t_ustep_tilde *)pd_new(ustep_tilde_class);
+	x->x_mode = mode;
+	x->x_thres = thres;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_mode);
+	floatinlet_new(&x->x_obj, &x->x_thres);
+	x->x_f = 0;
+	if(mode) x->x_mode = mode;
+	else x->x_mode = 0;
+	if(x->x_mode > 1) x->x_mode = 1;
+	if(x->x_mode < 0) x->x_mode = 0;
+	if(thres) x->x_thres = thres;
+	else x->x_thres = 0.5;
+    return (x);
+}
+
+static t_int *ustep_tilde_perform(t_int *w)
+{
+	t_ustep_tilde *x = (t_ustep_tilde *)(w[1]);
+    t_float *in = (t_float *)(w[2]);
+    t_float *out = (t_float *)(w[3]);
+    int n = (int)(w[4]);
+	float f, value;
+	int mode = x->x_mode;
+    while (n--)
+    {
+		f = *in++;
+		switch(mode){
+		case(0):
+			if (f >= x->x_thres)
+				value = 1;
+			else
+				value = 0;
+			break;
+		case(1):
+			if (f >= x->x_thres)
+				value = 1;
+			else
+				value = f;
+		}
+		*out++ = value;
+    }
+    return (w+5);
+}
+
+static void ustep_tilde_dsp(t_ustep_tilde *x, t_signal **sp)
+{
+    dsp_add(ustep_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void ustep_tilde_setup(void)
+{
+    ustep_tilde_class = class_new(gensym("sp.ustep~"), (t_newmethod)ustep_tilde_new, 0,
+    	sizeof(t_ustep_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(ustep_tilde_class, t_ustep_tilde, x_f);
+    class_addmethod(ustep_tilde_class, (t_method)ustep_tilde_dsp, gensym("dsp"), 0);
+}