aboutsummaryrefslogtreecommitdiff
path: root/src/sigzero~.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/sigzero~.c')
-rw-r--r--src/sigzero~.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/src/sigzero~.c b/src/sigzero~.c
new file mode 100644
index 0000000..de9584d
--- /dev/null
+++ b/src/sigzero~.c
@@ -0,0 +1,111 @@
+/******************************************************
+ *
+ * zexy - implementation file
+ *
+ * copyleft (c) IOhannes m zmölnig
+ *
+ * 1999:forum::für::umläute:2004
+ *
+ * institute of electronic music and acoustics (iem)
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ ******************************************************/
+
+/* ------------------------ sigzero~ ----------------------------- */
+/*
+ a very useful function, which detects, whether a signal is zeroes-only this block or not
+ this is really great together with the "switch~"-object
+*/
+
+#include "zexy.h"
+
+
+static t_class *sigzero_class;
+
+typedef struct _sigzero
+{
+ t_object x_obj;
+ int activate;
+ int current; /* 0 == (signalblock == 0); 1==(signalblock != 0) */
+} t_sigzero;
+
+static void sigzero_activate(t_sigzero *x, t_floatarg activate)
+{
+ x->activate = (activate)?1:0;
+}
+
+static void sigzero_banged(t_sigzero *x, t_floatarg activate)
+{
+ x->activate = 1;
+}
+
+static void sigzero_off(t_sigzero *x, t_floatarg activate)
+{
+ x->activate = 0;
+}
+
+static t_int *sigzero_perform(t_int *w)
+{
+ t_float *in = (t_float *)w[1];
+ t_sigzero *x = (t_sigzero *)w[2];
+ int n = (int)w[3];
+
+ int non_zero = 0;
+
+ if (x->activate) {
+ while (n--)
+ {
+ if (*in++ != 0.) {
+ non_zero = 1;
+ break;
+ }
+ }
+ if (non_zero != x->current) {
+ outlet_float(x->x_obj.ob_outlet, x->current = non_zero);
+ }
+// else post("non_zero=%d\tcurrent=%d", non_zero, x->current);
+ }
+
+ return (w+4);
+}
+
+static void sigzero_dsp(t_sigzero *x, t_signal **sp)
+{
+ dsp_add(sigzero_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+}
+
+static void helper(void)
+{
+ post("\n%c sigzero~-object :: for detecting whether a signal is currently zero or not", HEARTSYMBOL);
+ post("'bang'\t: turn the detector on\n"
+ "'off'\t: turn it off\n"
+ "<1/0>\t: turn it on/off\n"
+ "'help'\t: view this\n"
+ "signal~");
+ post("outlet :: 1/0\t: signal turned to non-zero/zero\n");
+}
+
+static void *sigzero_new(t_symbol s)
+{
+ t_sigzero *x = (t_sigzero *)pd_new(sigzero_class);
+ outlet_new(&x->x_obj, &s_float);
+ return (x);
+}
+
+void sigzero_tilde_setup(void)
+{
+ sigzero_class = class_new(gensym("sigzero~"), (t_newmethod)sigzero_new, 0,
+ sizeof(t_sigzero), 0, 0);
+ class_addfloat(sigzero_class, sigzero_activate);
+ class_addbang(sigzero_class, sigzero_banged);
+ class_addmethod(sigzero_class, (t_method)sigzero_off, gensym("off"), 0);
+
+ class_addmethod(sigzero_class, nullfn, gensym("signal"), 0);
+ class_addmethod(sigzero_class, (t_method)sigzero_dsp, gensym("dsp"), 0);
+
+ class_addmethod(sigzero_class, (t_method)helper, gensym("help"), 0);
+ class_sethelpsymbol(sigzero_class, gensym("zexy/sigzero~"));
+ zexy_register("sigzero~");
+}