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
---
 cyclone/sickle/rand.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 cyclone/sickle/rand.c

(limited to 'cyclone/sickle/rand.c')

diff --git a/cyclone/sickle/rand.c b/cyclone/sickle/rand.c
new file mode 100644
index 0000000..146cbc9
--- /dev/null
+++ b/cyclone/sickle/rand.c
@@ -0,0 +1,95 @@
+/* Copyright (c) 1997-2003 Miller Puckette, krzYszcz, and others.
+ * For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ * WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+/* This is a compilation of phasor~ and noise~ code from d_osc.c. */
+
+#include "m_pd.h"
+#include "shared.h"
+#include "sickle/sic.h"
+
+typedef struct _rand
+{
+    t_sic    x_sic;
+    t_float  x_rate;
+    double   x_lastphase;
+    double   x_nextphase;
+    float    x_rcpsr;
+    int      x_state;
+    float    x_target;
+    float    x_scaling;  /* LATER use phase increment */
+} t_rand;
+
+static t_class *rand_class;
+
+static t_int *rand_perform(t_int *w)
+{
+    t_rand *x = (t_rand *)(w[1]);
+    int nblock = (int)(w[2]);
+    t_float *rin = (t_float *)(w[3]);
+    t_float *out = (t_float *)(w[4]);
+    double lastph = x->x_lastphase;
+    double ph = x->x_nextphase;
+    double tfph = ph + SHARED_UNITBIT32;
+    t_shared_wrappy wrappy;
+    int32 normhipart;
+    float rcpsr = x->x_rcpsr;
+    float target = x->x_target;
+    float scaling = x->x_scaling;
+
+    wrappy.w_d = SHARED_UNITBIT32;
+    normhipart = wrappy.w_i[SHARED_HIOFFSET];
+
+    while (nblock--)
+    {
+	float rate = *rin++;
+	if (ph > lastph)
+	{
+	    int state = x->x_state;
+	    float newtarget = ((float)((state & 0x7fffffff) - 0x40000000))
+		* (float)(1.0 / 0x40000000);
+	    x->x_state = state * 435898247 + 382842987;
+	    x->x_scaling = scaling = target - newtarget;
+	    x->x_target = target = newtarget;
+	}
+	*out++ = ph * scaling + target;
+	lastph = ph;
+	if (rate > 0) rate = -rate;
+    	tfph += rate * rcpsr;
+	wrappy.w_d = tfph;
+    	wrappy.w_i[SHARED_HIOFFSET] = normhipart;
+	ph = wrappy.w_d - SHARED_UNITBIT32;
+    }
+    x->x_lastphase = lastph;
+    x->x_nextphase = ph;
+    return (w + 5);
+}
+
+static void rand_dsp(t_rand *x, t_signal **sp)
+{
+    x->x_rcpsr = 1. / sp[0]->s_sr;
+    dsp_add(rand_perform, 4, x, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
+}
+
+static void *rand_new(t_floatarg inirate)
+{
+    t_rand *x = (t_rand *)pd_new(rand_class);
+    /* borrowed from d_osc.c, LATER rethink */
+    static int init = 307;
+    x->x_state = (init *= 1319);
+    x->x_lastphase = 0.;
+    x->x_nextphase = 1.;  /* start from 0, force retargetting */
+    x->x_target = x->x_scaling = 0;
+    x->x_rate = (inirate > 0 ? -inirate : 0);
+    outlet_new((t_object *)x, &s_signal);
+    return (x);
+}
+
+void rand_tilde_setup(void)
+{
+    rand_class = class_new(gensym("rand~"),
+			   (t_newmethod)rand_new, 0,
+			   sizeof(t_rand), 0,
+			   A_DEFFLOAT, 0);
+    sic_setup(rand_class, rand_dsp, SIC_FLOATTOSIGNAL);
+}
-- 
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