1 files changed, 79 insertions, 0 deletions
diff --git a/shape~.c b/shape~.c
new file mode 100644
index 0000000..338c401
--- /dev/null
+++ b/shape~.c
@@ -0,0 +1,79 @@
+// sigpack
+// for
+// pure-data
+// by weiss
+// www.weiss-archiv.de
+
+#include "m_pd.h"
+#include <math.h>
+#ifdef _MSC_VER
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+// ------------------------ shape~ ----------------------------- 
+// this external reshapes the wave by an exponential function, inspiration was taken from the Nord module of the same name.
+// code from swh_plugins by steve harris www.plugin.org.uk  
+
+static t_class *shape_tilde_class;
+
+typedef struct _shape_tilde
+{
+    t_object x_obj;
+	t_sample x_shapep;
+	float x_f;
+} t_shape_tilde;
+
+static void *shape_tilde_new(t_floatarg waveshape)
+{
+    t_shape_tilde *x = (t_shape_tilde *)pd_new(shape_tilde_class);
+	x->x_shapep = waveshape;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_shapep);
+	x->x_f = 0;
+	if (waveshape) x->x_shapep = waveshape;
+	else x->x_shapep = 0.0f;
+    return (x);
+}
+
+static t_int *shape_tilde_perform(t_int *w)
+{
+	t_shape_tilde *x = (t_shape_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;
+	float shape = 0.0f;
+	if (x->x_shapep < 1.0f && x->x_shapep < -1.0f) {
+		shape = 1.0f;
+	} else if (shape < 0) {
+		shape = -1.0f / shape;
+	} else {
+		shape = x->x_shapep;
+	}
+
+    while (n--)
+    {
+		f = *in++;
+		if (f < 0.0f) {
+			value = -pow(-f, shape);
+		} else {
+			value = pow(f, shape);
+		}
+		*out++ = value;
+    }
+    return (w+5);
+}
+
+static void shape_tilde_dsp(t_shape_tilde *x, t_signal **sp)
+{
+    dsp_add(shape_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void shape_tilde_setup(void)
+{
+    shape_tilde_class = class_new(gensym("shape~"), (t_newmethod)shape_tilde_new, 0,
+    	sizeof(t_shape_tilde), 0, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(shape_tilde_class, t_shape_tilde, x_f);
+    class_addmethod(shape_tilde_class, (t_method)shape_tilde_dsp, gensym("dsp"), 0);
+}