1 files changed, 71 insertions, 0 deletions
diff --git a/source/foldover~.c b/source/foldover~.c
new file mode 100644
index 0000000..7741c08
--- /dev/null
+++ b/source/foldover~.c
@@ -0,0 +1,71 @@
+/* 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.foldover~ ----------------------------- */
+/* foldover distortion */
+/* code from swh_plugins by steve harris www.plugin.org.uk */
+
+static t_class *foldover_tilde_class;
+
+typedef struct _foldover_tilde
+{
+    t_object x_obj;
+	t_sample x_drive_p;
+	t_sample x_push;
+	float x_f;
+} t_foldover_tilde;
+
+static void *foldover_tilde_new(t_floatarg drive_p, t_floatarg push)
+{
+    t_foldover_tilde *x = (t_foldover_tilde *)pd_new(foldover_tilde_class);
+	x->x_drive_p = drive_p;
+	x->x_push = push;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_drive_p);
+	floatinlet_new(&x->x_obj, &x->x_push);
+	x->x_f = 0;
+	if(drive_p) x->x_drive_p = drive_p;
+	else x->x_drive_p = 0;
+	if(push) x->x_push = push;
+	else x->x_push = 0;
+    return (x);
+}
+
+static t_int *foldover_tilde_perform(t_int *w)
+{
+	t_foldover_tilde *x = (t_foldover_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, y;
+	float drive = x->x_drive_p + 1.0f;
+    while (n--)
+    {
+		f = *in++;
+		y = f * drive + x->x_push;
+		value = 1.5f * y - 0.5f * y * y *y;
+		*out++ = value;
+    }
+    return (w+5);
+}
+
+static void foldover_tilde_dsp(t_foldover_tilde *x, t_signal **sp)
+{
+    dsp_add(foldover_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void foldover_tilde_setup(void)
+{
+    foldover_tilde_class = class_new(gensym("sp.foldover~"), (t_newmethod)foldover_tilde_new, 0,
+    	sizeof(t_foldover_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(foldover_tilde_class, t_foldover_tilde, x_f);
+    class_addmethod(foldover_tilde_class, (t_method)foldover_tilde_dsp, gensym("dsp"), 0);
+}