renamed *_tilde.c-files to *~.c

svn path=/trunk/externals/zexy/; revision=2998

1 files changed, 141 insertions, 0 deletions

diff --git a/src/step~.c b/src/step~.c
new file mode 100644
index 0000000..f1200e7
--- /dev/null
+++ b/src/step~.c
@@ -0,0 +1,141 @@
+/******************************************************
+ *
+ * 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
+ ******************************************************/
+
+/*
+step~  : will make a unity step at a desired point in the signal-vector; the second input specifies a 
+			length:	after the so-specified time has elapsed, the step will toggle back to the previous
+			value;
+			the length can be passed as an argument when creating the object
+			with length==1 you might do the dirac~ thing a little bit more complicated
+			with length==0 the output just toggles between 0 and 1 every time you bang the object
+
+NOTE : the inlets do NOT specify any times but sample-NUMBERS; there are 64 samples in a signal-vector,
+		each "lasting" for 1/44100 secs.
+*/
+
+#include "zexy.h"
+
+/* ------------------------ step~ ----------------------------- */ 
+
+static t_class *step_class;
+
+typedef struct _step
+{
+    t_object x_obj;
+	int position;
+	int length;
+
+	int toggle;
+
+	int wait4start;
+	int wait4stop;
+} t_step;
+
+static void step_bang(t_step *x)
+{
+	x->wait4stop = x->length + (x->wait4start = x->position);
+}
+
+static void step_float(t_step *x, t_float where)
+{
+	x->wait4stop = x->length + 
+		(x->wait4start =
+			(x->position = (where>0)*where)
+		);
+}
+
+static void step_setlength(t_step *x, t_float arg)
+{
+	x->length = 1 + (arg>0)*arg;
+}
+
+
+
+static t_int *step_perform(t_int *w)
+{
+	t_step *x = (t_step *)(w[1]);
+    t_float *out = (t_float *)(w[2]);
+    int n = (int)(w[3]);
+
+	int toggle = x->toggle;
+
+	int wait4start = x->wait4start, wait4stop = x->wait4stop;
+
+	while (n--)
+	{
+		wait4stop--;
+		if (!wait4start--) toggle ^= 1;
+		else if (!wait4stop) toggle ^= 1;
+
+		*out++ = toggle;		
+	}
+
+	x->wait4start = wait4start;
+	x->wait4stop = wait4stop;
+
+	x->toggle = toggle;
+	return (w+4);
+}
+
+static void step_dsp(t_step *x, t_signal **sp)
+{
+	dsp_add(step_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
+}
+
+
+static void step_helper(void)
+{
+	post("%c step~-object :: generates a unity-step", HEARTSYMBOL);
+	post("creation : \"dirac~ [<position> [<length>]]\" : create a rectangular window\n"
+		"\t\t\tat specified position and with specified length (in samples)\n"
+		 "inlet1\t: <position>\t: create a rectangular window at new position\n"
+		 "\t  'bang'\t: create a rectangular window at specified position\n"
+		 "\t  'help'\t: view this\n"
+		 "inlet2\t: <length>\t: define new window length ('0' will make a unity-step)\n"
+		 "outlet\t: signal~");
+}
+
+
+static void *step_new(t_floatarg farg)
+{
+	t_step *x = (t_step *)pd_new(step_class);
+
+	inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
+	outlet_new(&x->x_obj, gensym("signal"));
+
+	x->position = 0;
+	x->wait4start = x->wait4stop = 0;
+	x->toggle = 1;
+
+	step_setlength(x, farg);
+
+	return (x);
+}
+ 
+void step_tilde_setup(void)
+{
+	step_class = class_new(gensym("step~"), (t_newmethod)step_new, 0,
+		sizeof(t_step), 0, A_DEFFLOAT, 0);
+
+	class_addfloat(step_class, step_float);
+	class_addbang(step_class, step_bang); 
+	class_addmethod(step_class, (t_method)step_setlength, gensym("ft1"), A_FLOAT, 0);
+	class_addmethod(step_class, (t_method)step_dsp, gensym("dsp"), 0);
+
+	class_addmethod(step_class, (t_method)step_helper, gensym("help"), 0);
+	class_sethelpsymbol(step_class, gensym("zexy/step~"));
+
+  zexy_register("step~");
+}