2 files changed, 109 insertions, 0 deletions
diff --git a/externals/extra/lrshift~/lrshift~-help.pd b/externals/extra/lrshift~/lrshift~-help.pd
new file mode 100644
index 00000000..fdf7b0c5
--- /dev/null
+++ b/externals/extra/lrshift~/lrshift~-help.pd
@@ -0,0 +1,33 @@
+#N canvas 143 0 673 325 12;
+#X msg 268 277 bang;
+#X obj 244 303 print~;
+#X msg 185 278 bang;
+#X obj 161 304 print~;
+#X text 53 117 click here first;
+#X msg 72 270 bang;
+#X obj 48 296 print~;
+#X text 162 222 shift left;
+#X text 243 224 shift right;
+#X obj 161 252 lrshift~ 1;
+#X obj 244 251 lrshift~ -1;
+#X text 39 37 Acting at whatever vector size the window is running
+at \, lrshift~ shifts samples to the left (toward the beginning sample)
+or to the right. The argument gives the direction and the amount of
+the shift. The rightmost (or leftmost) samples are set to zero.;
+#N canvas 0 0 450 300 (subpatch) 0;
+#X array shiftin 64 float 0;
+#X coords 0 1 63 0 200 140 1;
+#X restore 448 118 graph;
+#X text 115 11 -- shift signal vector elements left or right;
+#X msg 54 138 \; pd dsp 1 \; shiftin 1 1;
+#X obj 48 204 tabreceive~ shiftin;
+#X text 525 308 Updated for Pd 0.31.;
+#X obj 47 11 lrshift~;
+#X connect 0 0 1 0;
+#X connect 2 0 3 0;
+#X connect 5 0 6 0;
+#X connect 9 0 3 0;
+#X connect 10 0 1 0;
+#X connect 15 0 6 0;
+#X connect 15 0 9 0;
+#X connect 15 0 10 0;
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);
+}