1 files changed, 74 insertions, 0 deletions
diff --git a/cyclone/sickle/log.c b/cyclone/sickle/log.c
new file mode 100644
index 0000000..74e3e40
--- /dev/null
+++ b/cyclone/sickle/log.c
@@ -0,0 +1,74 @@
+/* Copyright (c) 2002-2003 krzYszcz and others.
+ * For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ * WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+#include <math.h>
+#include "m_pd.h"
+#include "sickle/sic.h"
+
+#if defined(NT) || defined(MACOSX)
+/* cf pd/src/x_arithmetic.c */
+#define logf  log
+#endif
+
+#define LOG_MININPUT  1e-10  /* CHECKED */
+
+typedef struct _log
+{
+    t_sic    x_sic;
+    t_float  x_rcplogbase;  /* LATER consider using double (and log()) */
+} t_log;
+
+static t_class *log_class;
+
+static void log_ft1(t_log *x, t_floatarg f)
+{
+    x->x_rcplogbase = (f == 0. ? 1. :   /* CHECKED no protection against NaNs */
+		       (f == 1. ? 0. :  /* CHECKED */
+			1. / logf(f)));
+}
+
+static t_int *log_perform(t_int *w)
+{
+    int nblock = (int)(w[1]);
+    t_float *in = (t_float *)(w[2]);
+    t_float *out = (t_float *)(w[3]);
+    t_float rcplogbase = *(t_float *)(w[4]);
+    if (rcplogbase != 0.)
+    {
+	while (nblock--)
+	{
+	    float f = *in++;
+	    if (f < LOG_MININPUT)
+		f = LOG_MININPUT;  /* CHECKED */
+	    *out++ = logf(f) * rcplogbase;
+	}
+    }
+    else while (nblock--) *out++ = 0.;
+    return (w + 5);
+}
+
+static void log_dsp(t_log *x, t_signal **sp)
+{
+    dsp_add(log_perform, 4, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec,
+	    &x->x_rcplogbase);
+}
+
+static void *log_new(t_floatarg f)
+{
+    t_log *x = (t_log *)pd_new(log_class);
+    inlet_new((t_object *)x, (t_pd *)x, &s_float, gensym("ft1"));
+    outlet_new((t_object *)x, &s_signal);
+    log_ft1(x, f);
+    return (x);
+}
+
+void log_tilde_setup(void)
+{
+    log_class = class_new(gensym("log~"),
+			  (t_newmethod)log_new, 0,
+			  sizeof(t_log), 0, A_DEFFLOAT, 0);
+    sic_setup(log_class, log_dsp, SIC_FLOATTOSIGNAL);
+    class_addmethod(log_class, (t_method)log_ft1,
+		    gensym("ft1"), A_FLOAT, 0);
+}