From 5af7081222ef801b23857fb904c78d0798f5d0df Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Mon, 10 Jan 2011 06:03:02 +0000
Subject: build Pd's extra as a libdir

svn path=/trunk/; revision=14694
---
 externals/extra/lrshift~/lrshift~.c | 76 +++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 externals/extra/lrshift~/lrshift~.c

(limited to 'externals/extra/lrshift~/lrshift~.c')

diff --git a/externals/extra/lrshift~/lrshift~.c b/externals/extra/lrshift~/lrshift~.c
new file mode 100644
index 00000000..166facc1
--- /dev/null
+++ b/externals/extra/lrshift~/lrshift~.c
@@ -0,0 +1,76 @@
+#include "m_pd.h"
+
+/* ------------------------ lrshift~ ----------------------------- */
+
+static t_class *lrshift_tilde_class;
+
+typedef struct _lrshift_tilde
+{
+    t_object x_obj;
+    int x_n;
+    float x_f;
+} t_lrshift_tilde;
+
+static t_int *leftshift_perform(t_int *w)
+{
+    t_float *in = (t_float *)(w[1]);
+    t_float *out= (t_float *)(w[2]);
+    int n = (int)(w[3]);
+    int shift = (int)(w[4]);
+    in += shift;
+    n -= shift;
+    while (n--)
+        *out++ = *in++;
+    while (shift--)
+        *out++ = 0;
+    return (w+5);
+}
+
+static t_int *rightshift_perform(t_int *w)
+{
+    t_float *in = (t_float *)(w[1]);
+    t_float *out= (t_float *)(w[2]);
+    int n = (int)(w[3]);
+    int shift = (int)(w[4]);
+    n -= shift;
+    in -= shift;
+    while (n--)
+        *--out = *--in;
+    while (shift--)
+        *--out = 0;
+    return (w+5);
+}
+
+static void lrshift_tilde_dsp(t_lrshift_tilde *x, t_signal **sp)
+{
+    int n = sp[0]->s_n;
+    int shift = x->x_n;
+    if (shift > n)
+        shift = n;
+    if (shift < -n)
+        shift = -n;
+    if (shift < 0)
+        dsp_add(rightshift_perform, 4,
+            sp[0]->s_vec + n, sp[1]->s_vec + n, n, -shift);
+    else dsp_add(leftshift_perform, 4,
+            sp[0]->s_vec, sp[1]->s_vec, n, shift);
+}
+
+static void *lrshift_tilde_new(t_floatarg f)
+{
+    t_lrshift_tilde *x = (t_lrshift_tilde *)pd_new(lrshift_tilde_class);
+    x->x_n = f;
+    x->x_f = 0;
+    outlet_new(&x->x_obj, gensym("signal"));
+    return (x);
+}
+
+void lrshift_tilde_setup(void)
+{
+    lrshift_tilde_class = class_new(gensym("lrshift~"),
+        (t_newmethod)lrshift_tilde_new, 0, sizeof(t_lrshift_tilde), 0, 
+            A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(lrshift_tilde_class, t_lrshift_tilde, x_f);
+    class_addmethod(lrshift_tilde_class, (t_method)lrshift_tilde_dsp,
+        gensym("dsp"), 0);
+}
-- 
cgit v1.2.1