From d449d31030cfc4a3e06858bf877dcbfacad59f74 Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Mon, 9 Jan 2006 21:24:28 +0000
Subject: checked in code from sIgpAck0.03.ZIP; cleaned up comment warnings and
 changed #ifdef NT to #ifdef _MSC_VER; removed sp. prefix and set up for
 namespaces

svn path=/trunk/externals/sigpack/; revision=4381
---
 source/diode~.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 source/diode~.c

(limited to 'source/diode~.c')

diff --git a/source/diode~.c b/source/diode~.c
new file mode 100644
index 0000000..b024da1
--- /dev/null
+++ b/source/diode~.c
@@ -0,0 +1,78 @@
+/* sIgpAck
+ * for
+ * pure-data
+ * www.weiss-archiv.de */
+
+#include "m_pd.h"
+#include <math.h>
+#ifdef _MSC_VER
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+/* ------------------------ sp.diode~ ----------------------------- */
+/* Mangles the signal as if it had been passed through a diode rectifier network.*/
+/* code from swh_plugins by steve harris www.plugin.org.uk */
+
+static t_class *diode_tilde_class;
+
+typedef struct _diode_tilde
+{
+    t_object x_obj;
+	t_sample x_mode;//0=none,1=halfWave,2=fullWave
+	float x_f;
+} t_diode_tilde;
+
+static void *diode_tilde_new(t_floatarg mode)
+{
+    t_diode_tilde *x = (t_diode_tilde *)pd_new(diode_tilde_class);
+	x->x_mode = mode;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_mode);
+	x->x_f = 0;
+	if(mode) x->x_mode = mode;
+	else x->x_mode = 0;
+    return (x);
+}
+
+static t_int *diode_tilde_perform(t_int *w)
+{
+	t_diode_tilde *x = (t_diode_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(x->x_mode >= 0.0f && x->x_mode < 1.0f) {
+			value = ((1.0f - x->x_mode) * f + (x->x_mode * (f > 0.0f ? f : 0.0f)));
+		}
+		else if (x->x_mode >= 1.0f && x->x_mode < 2.0f) {
+			float fac = x->x_mode - 1.0f;
+			value = ((1.0f - fac) * (f > 0 ? f : 0.0)) + (fac * fabs(f));
+		}
+		else if (x->x_mode >= 2) {
+			float fac = x->x_mode < 3 ? x->x_mode - 2 : 1.0;
+			value = (1.0 - fac) * fabs(f);
+		}
+		else {
+			value = f;
+		}
+		*out++ = value;
+    }
+    return (w+5);
+}
+
+static void diode_tilde_dsp(t_diode_tilde *x, t_signal **sp)
+{
+    dsp_add(diode_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void diode_tilde_setup(void)
+{
+    diode_tilde_class = class_new(gensym("sp.diode~"), (t_newmethod)diode_tilde_new, 0,
+    	sizeof(t_diode_tilde), 0, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(diode_tilde_class, t_diode_tilde, x_f);
+    class_addmethod(diode_tilde_class, (t_method)diode_tilde_dsp, gensym("dsp"), 0);
+}
-- 
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