From faada59567f8cb252f4a909116595ce309ff5828 Mon Sep 17 00:00:00 2001
From: "N.N." <krzyszcz@users.sourceforge.net>
Date: Fri, 23 May 2003 12:29:55 +0000
Subject: This commit was generated by cvs2svn to compensate for changes in
 r647, which included commits to RCS files with non-trunk default branches.

svn path=/trunk/externals/miXed/; revision=648
---
 shared/sickle/sic.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 shared/sickle/sic.c

(limited to 'shared/sickle/sic.c')

diff --git a/shared/sickle/sic.c b/shared/sickle/sic.c
new file mode 100644
index 0000000..003120e
--- /dev/null
+++ b/shared/sickle/sic.c
@@ -0,0 +1,119 @@
+/* Copyright (c) 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.  */
+
+/* generic signal class */
+
+#include <math.h>
+#include "m_pd.h"
+#include "shared.h"
+#include "common/loud.h"
+#include "sickle/sic.h"
+
+//#define SIC_DEBUG
+
+#if defined(NT) || defined(MACOSX)
+/* cf pd/src/x_arithmetic.c */
+#define cosf  cos
+#endif
+
+t_inlet *sic_inlet(t_sic *x, int ix, t_float df, int ax, int ac, t_atom *av)
+{
+    t_inlet *in = 0;
+    if (ax < ac)
+    {
+	if (av[ax].a_type == A_FLOAT)
+	    df = av[ax].a_w.w_float;
+	else
+	    loud_error((t_pd *)x, "bad argument %d (float expected)", ax + 1);
+    }
+    if (ix)
+    {
+	in = inlet_new((t_object *)x, (t_pd *)x, &s_signal, &s_signal);
+	/* this is persistent (in->i_un.iu_floatsignalvalue = df) */
+	pd_float((t_pd *)in, df);
+    }
+    else
+    {
+	in = ((t_object *)x)->ob_inlet;
+	pd_float((t_pd *)x, df);
+    }
+    return (in);
+}
+
+t_inlet *sic_newinlet(t_sic *x, t_float f)
+{
+    return (sic_inlet(x, 1, f, 0, 0, 0));
+}
+
+t_float *sic_makecostable(int *sizep)
+{
+    /* permanent cache (tables are never freed); LATER rethink */
+    static t_float *sic_costables[SIC_NCOSTABLES];
+    int ndx, sz;
+    /* round upwards -- always return at least requested number of elements,
+       unless the maximum of 2^SIC_NCOSTABLES is exceeded; LATER rethink */
+    /* (the minimum, at ndx 0, is 2^1) */
+    for (ndx = 0, sz = 2; ndx < (SIC_NCOSTABLES - 1); ndx++, sz <<= 1)
+	if (sz >= *sizep)
+	    break;
+#ifdef SIC_DEBUG
+    post("request for a costable of %d points (effective %d, ndx %d)",
+	 *sizep, sz, ndx);
+#endif
+    *sizep = sz;
+    if (sic_costables[ndx])
+	return (sic_costables[ndx]);
+    else if (sz == COSTABSIZE && cos_table)
+	return (sic_costables[ndx] = cos_table);
+    else
+    {
+	int cnt = sz + 1;
+	float phase = 0, phsinc = SHARED_2PI / sz;
+	t_float *table = (t_float *)getbytes(cnt * sizeof(*table)), *tp = table;
+	if (table)
+	{
+#ifdef SIC_DEBUG
+	    post("got %d points of a costable", cnt);
+#endif
+	    while (cnt--)
+	    {
+		*tp++ = cosf(phase);
+		phase += phsinc;
+	    }
+	}
+	return (sic_costables[ndx] = table);
+    }
+}
+
+static void sic_enable(t_sic *x, t_floatarg f)
+{
+    x->s_disabled = (f == 0);
+}
+
+void sic_setup(t_class *c, void *dspfn, void *floatfn)
+{
+    static int checked = 0;
+    if (!checked)
+    {
+	/* MSP: here we check at startup whether the byte alignment
+	   is as we declared it.  If not, the code has to be
+	   recompiled the other way. */
+	t_shared_wrappy wrappy;
+	wrappy.w_d = SHARED_UNITBIT32 + 0.5;
+	if ((unsigned)wrappy.w_i[SHARED_LOWOFFSET] != 0x80000000)
+	    bug("sic_setup: unexpected machine alignment");
+	checked = 1;
+    }
+    if (floatfn != SIC_NOMAINSIGNALIN)
+    {
+	if (floatfn)
+	{
+	    class_domainsignalin(c, -1);
+	    class_addfloat(c, floatfn);
+	}
+	else CLASS_MAINSIGNALIN(c, t_sic, s_f);
+    }
+    class_addmethod(c, (t_method)dspfn, gensym("dsp"), 0);
+    class_addmethod(c, (t_method)sic_enable, gensym("enable"), 0);
+}
-- 
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