1 files changed, 106 insertions, 0 deletions
diff --git a/cyclone/sickle/edge.c b/cyclone/sickle/edge.c
new file mode 100644
index 0000000..b206f6b
--- /dev/null
+++ b/cyclone/sickle/edge.c
@@ -0,0 +1,106 @@
+/* Copyright (c) 2002-2003 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 "m_pd.h"
+#include "sickle/sic.h"
+
+typedef struct _edge
+{
+    t_sic      x_sic;
+    t_float    x_last;
+    int        x_zeroleft;
+    int        x_zerohit;
+    t_outlet  *x_out2;
+    t_clock   *x_clock;
+} t_edge;
+
+static t_class *edge_class;
+
+static void edge_tick(t_edge *x)
+{
+    /* CHECKED both may fire simultaneously */
+    if (x->x_zeroleft)
+    {
+	outlet_bang(((t_object *)x)->ob_outlet);
+	x->x_zeroleft = 0;
+    }
+    if (x->x_zerohit)
+    {
+	outlet_bang(x->x_out2);
+	x->x_zerohit = 0;
+    }
+}
+
+static t_int *edge_perform(t_int *w)
+{
+    t_edge *x = (t_edge *)(w[1]); 
+    int nblock = (int)(w[2]);
+    t_float *in = (t_float *)(w[3]);
+    t_float last = x->x_last;
+    while (nblock--)
+    {
+	float f = *in++;
+	if (last == 0.)
+	{
+	    if (f != 0.)
+	    {
+		x->x_zeroleft = 1;
+		if (x->x_zerohit)
+		{
+		    clock_delay(x->x_clock, 0);
+		    x->x_last = in[nblock - 1];
+		    return (w + 4);
+		}
+	    }
+	}
+	else
+	{
+	    if (f == 0.)
+	    {
+		x->x_zerohit = 1;
+		if (x->x_zeroleft)
+		{
+		    clock_delay(x->x_clock, 0);
+		    x->x_last = in[nblock - 1];
+		    return (w + 4);
+		}
+	    }
+	}
+	last = f;
+    }
+    if (x->x_zeroleft || x->x_zerohit) clock_delay(x->x_clock, 0);
+    x->x_last = last;
+    return (w + 4);
+}
+
+static void edge_dsp(t_edge *x, t_signal **sp)
+{
+    dsp_add(edge_perform, 3, x, sp[0]->s_n, sp[0]->s_vec);
+}
+
+static void edge_free(t_edge *x)
+{
+    if (x->x_clock) clock_free(x->x_clock);
+}
+
+static void *edge_new(t_floatarg f)
+{
+    t_edge *x = (t_edge *)pd_new(edge_class);
+    x->x_last = 0.;  /* CHECKED fires at startup */
+    x->x_zeroleft = x->x_zerohit = 0;
+    outlet_new((t_object *)x, &s_bang);
+    x->x_out2 = outlet_new((t_object *)x, &s_bang);
+    x->x_clock = clock_new(x, (t_method)edge_tick);
+    return (x);
+}
+
+void edge_tilde_setup(void)
+{
+    edge_class = class_new(gensym("edge~"),
+			   (t_newmethod)edge_new,
+			   (t_method)edge_free,
+			   sizeof(t_edge), 0,
+			   A_DEFFLOAT, 0);
+    sic_setup(edge_class, edge_dsp, SIC_FLOATTOSIGNAL);
+}