1 files changed, 70 insertions, 0 deletions
diff --git a/source/foldback~.c b/source/foldback~.c
new file mode 100644
index 0000000..4101a5a
--- /dev/null
+++ b/source/foldback~.c
@@ -0,0 +1,70 @@
+/* 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.foldback~ ----------------------------- */
+/* signal mirror */
+
+static t_class *foldback_tilde_class;
+
+typedef struct _foldback_tilde
+{
+    t_object x_obj;
+	t_sample x_low;
+	t_sample x_high;
+	float x_f;
+} t_foldback_tilde;
+
+static void *foldback_tilde_new(t_floatarg low, t_floatarg high)
+{
+    t_foldback_tilde *x = (t_foldback_tilde *)pd_new(foldback_tilde_class);
+	x->x_low = low;
+	x->x_high = high;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_low);
+	floatinlet_new(&x->x_obj, &x->x_high);
+	x->x_f = 0;
+	if(low) x->x_low = low;
+	else x->x_low = -1;
+	if(high) x->x_high = high;
+	else x->x_high = 1;
+    return (x);
+}
+
+static t_int *foldback_tilde_perform(t_int *w)
+{
+	t_foldback_tilde *x = (t_foldback_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;
+    while (n--)
+    {
+		f = *in++;
+		if(f < x->x_low) value = (f - ((f - x->x_low) * 2));
+		else if(f > x->x_high) value = (f - ((f - x->x_high) * 2));
+		else value = f;
+		*out++ = value;
+    }
+    return (w+5);
+}
+
+static void foldback_tilde_dsp(t_foldback_tilde *x, t_signal **sp)
+{
+    dsp_add(foldback_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void foldback_tilde_setup(void)
+{
+    foldback_tilde_class = class_new(gensym("sp.foldback~"), (t_newmethod)foldback_tilde_new, 0,
+    	sizeof(t_foldback_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(foldback_tilde_class, t_foldback_tilde, x_f);
+    class_addmethod(foldback_tilde_class, (t_method)foldback_tilde_dsp, gensym("dsp"), 0);
+}