1 files changed, 80 insertions, 0 deletions
diff --git a/cyclone/sickle/overdrive.c b/cyclone/sickle/overdrive.c
new file mode 100644
index 0000000..1625dd4
--- /dev/null
+++ b/cyclone/sickle/overdrive.c
@@ -0,0 +1,80 @@
+/* Copyright (c) 2005 krzYszcz and others.
+ * For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ * WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+#include <math.h>
+#include "m_pd.h"
+#include "sickle/sic.h"
+
+/* FIXME this is unnecessary in vc > 6.0 and darwin? */
+#if defined(MSW) || defined(MACOSX)
+#define powf  pow
+#endif
+
+typedef struct _overdrive
+{
+    t_sic  x_sic;
+    float  x_drivefactor;
+} t_overdrive;
+
+static t_class *overdrive_class;
+
+/* CHECKED this is redundant (a design flaw), LATER fitter-optionally use
+   float-to-signal conversion. */
+static void overdrive_float(t_overdrive *x, t_float f)
+{
+    x->x_drivefactor = f;
+}
+
+static void overdrive_ft1(t_overdrive *x, t_floatarg f)
+{
+    x->x_drivefactor = f;
+}
+
+/* CHECKED negative parameter values may cause output to go out of bounds */
+static t_int *overdrive_perform(t_int *w)
+{
+    float df = *(t_float *)(w[1]);
+    int nblock = (int)(w[2]);
+    t_float *in = (t_float *)(w[3]);
+    t_float *out = (t_float *)(w[4]);
+    while (nblock--)
+    {
+	float f = *in++;
+	if (f >= 1.)  /* CHECKED incompatible (garbage for sig~ 1.) */
+	    *out++ = 1.;  /* CHECKED constant for > 1. */
+	else if (f > 0.)
+	    *out++ = 1. - powf(1. - f, df);  /* CHECKED */
+	else if (f > -1.)  /* CHECKED incompatible (garbage for sig~ -1.) */
+	    *out++ = powf(1. + f, df) - 1.;  /* CHECKED */
+	else
+	    *out++ = -1.;  /* CHECKED constant for < -1. */
+    }
+    return (w + 5);
+}
+
+static void overdrive_dsp(t_overdrive *x, t_signal **sp)
+{
+    dsp_add(overdrive_perform, 4, &x->x_drivefactor,
+	    sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
+}
+
+static void *overdrive_new(t_floatarg f)
+{
+    t_overdrive *x = (t_overdrive *)pd_new(overdrive_class);
+    x->x_drivefactor = f;
+    inlet_new((t_object *)x, (t_pd *)x, &s_float, gensym("ft1"));
+    outlet_new((t_object *)x, &s_signal);
+    return (x);
+}
+
+void overdrive_tilde_setup(void)
+{
+    overdrive_class = class_new(gensym("overdrive~"),
+				(t_newmethod)overdrive_new, 0,
+				sizeof(t_overdrive), 0, A_DEFFLOAT, 0);
+    /* CHECKED no float-to-signal conversion */
+    sic_setup(overdrive_class, overdrive_dsp, overdrive_float);
+    class_addmethod(overdrive_class, (t_method)overdrive_ft1,
+		    gensym("ft1"), A_FLOAT, 0);
+}