1 files changed, 56 insertions, 0 deletions
diff --git a/externals/vanilla/log~.c b/externals/vanilla/log~.c
new file mode 100644
index 00000000..0dc5f9fd
--- /dev/null
+++ b/externals/vanilla/log~.c
@@ -0,0 +1,56 @@
+/* Copyright (c) 1997-2001 Miller Puckette 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 <math.h>
+
+static t_class *log_tilde_class;
+
+typedef struct _log_tilde
+{
+    t_object x_obj;
+    t_float x_f;
+} t_log_tilde;
+
+static void *log_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+    t_log_tilde *x = (t_log_tilde *)pd_new(log_tilde_class);
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+    outlet_new(&x->x_obj, &s_signal);
+    x->x_f = 0;
+    return (x);
+}
+
+t_int *log_tilde_perform(t_int *w)
+{
+    t_sample *in1 = (t_sample *)(w[1]);
+    t_sample *in2 = (t_sample *)(w[2]);
+    t_sample *out = (t_sample *)(w[3]);
+    int n = (int)(w[4]);
+    while (n--)
+    {
+        float f = *in1++, g = *in2++;
+        if (f <= 0)
+            *out = -1000;   /* rather than blow up, output a number << 0 */
+        else if (g <= 0)
+            *out = log(f);
+        else *out = log(f)/log(g);
+        out++;
+    }
+    return (w+5);
+}
+
+static void log_tilde_dsp(t_log_tilde *x, t_signal **sp)
+{
+    dsp_add(log_tilde_perform, 4,
+        sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n);
+}
+
+static void log_tilde_setup(void)
+{
+    log_tilde_class = class_new(gensym("log~"), (t_newmethod)log_tilde_new, 0,
+        sizeof(t_log_tilde), 0, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(log_tilde_class, t_log_tilde, x_f);
+    class_addmethod(log_tilde_class, (t_method)log_tilde_dsp, gensym("dsp"), 0);
+}