1 files changed, 105 insertions, 0 deletions
diff --git a/source/sieve~.c b/source/sieve~.c
new file mode 100644
index 0000000..31ec10b
--- /dev/null
+++ b/source/sieve~.c
@@ -0,0 +1,105 @@
+/* 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.sieve~ ----------------------------- */
+/* sift samples */
+
+static t_class *sieve_tilde_class;
+
+typedef struct _sieve_tilde
+{
+    t_object x_obj;
+	t_sample x_mode;
+	t_sample x_sample;
+	t_sample x_last;
+	float x_f;
+} t_sieve_tilde;
+
+static void *sieve_tilde_new(t_floatarg mode, t_floatarg sample)
+{
+    t_sieve_tilde *x = (t_sieve_tilde *)pd_new(sieve_tilde_class);
+	x->x_mode = mode;
+	x->x_sample = sample;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_mode);
+	floatinlet_new(&x->x_obj, &x->x_sample);
+	x->x_last = 0;
+	x->x_f = 0;
+	x->x_mode = 0;
+	
+	if(mode) x->x_mode = mode;
+	if(x->x_mode > 1) x->x_mode = 1;
+	if(x->x_mode < 0) x->x_mode = 0;
+    return (x);
+}
+
+static float round(float in)
+{
+	float y, round;
+	int temp;
+	{
+		round = in * 10;
+		temp = round;
+		y = temp * 0.1;
+	}
+	return y;
+}
+
+static t_int *sieve_tilde_perform(t_int *w)
+{
+	t_sieve_tilde *x = (t_sieve_tilde *)(w[1]);
+    t_float *in = (t_float *)(w[2]);
+    t_float *out = (t_float *)(w[3]);
+    int n = (int)(w[4]);
+	float f;
+	int mode = x->x_mode;
+    while (n--)
+    {
+		f = *in++;
+		switch(mode){
+		case(0):
+			if (round(f) != round(x->x_sample))
+			{
+				*out++ = f;
+				x->x_last = f;
+			}
+			else
+			{
+				*out++ = x->x_last;
+			}
+			break;
+		case(1):
+			if (round(f) == round(x->x_sample))
+			{
+				*out++ = f;
+				x->x_last = f;
+			}
+			else
+			{
+				*out++ = x->x_last;
+			}
+		}
+    }
+    return (w+5);
+}
+
+static void sieve_tilde_dsp(t_sieve_tilde *x, t_signal **sp)
+{
+    dsp_add(sieve_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void sieve_tilde_setup(void)
+{
+    sieve_tilde_class = class_new(gensym("sp.sieve~"), (t_newmethod)sieve_tilde_new, 0,
+    	sizeof(t_sieve_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(sieve_tilde_class, t_sieve_tilde, x_f);
+    class_addmethod(sieve_tilde_class, (t_method)sieve_tilde_dsp, gensym("dsp"), 0);
+}