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-rw-r--r--cyclone/sickle/overdrive.c80
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diff --git a/cyclone/sickle/overdrive.c b/cyclone/sickle/overdrive.c
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+/* 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);
+}