This commit was generated by cvs2svn to compensate for changes in r1738,svn2git-root

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svn path=/trunk/externals/iemlib/; revision=1739

1 files changed, 129 insertions, 0 deletions

diff --git a/src/iemlib2/sigLFO_noise.c b/src/iemlib2/sigLFO_noise.c
new file mode 100644
index 0000000..3714f5a
--- /dev/null
+++ b/src/iemlib2/sigLFO_noise.c
@@ -0,0 +1,129 @@
+/* Copyright (c) 1997-2003 Miller Puckette.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iemlib2 written by Thomas Musil (c) IEM KUG Graz Austria 2000 - 2003 */
+
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <math.h>
+
+/* ------------------------ LFO_noise~ ----------------------------- */
+
+static t_class *sigLFO_noise_class;
+
+typedef struct _sigLFO_noise
+{
+    t_object     x_obj;
+    double       x_range;
+    double       x_rcp_range;
+    unsigned int x_state;
+    float        x_fact;
+    float        x_incr;
+    float        x_y1;
+    float        x_y2;
+    float        x_phase;
+} t_sigLFO_noise;
+
+static int sigLFO_noise_makeseed(void)
+{
+    static unsigned int sigLFO_noise_nextseed = 1489853723;
+
+    sigLFO_noise_nextseed = sigLFO_noise_nextseed * 435898247 + 938284287;
+    return(sigLFO_noise_nextseed & 0x7fffffff);
+}
+
+static float sigLFO_noise_new_rand(t_sigLFO_noise *x)
+{
+    unsigned int state = x->x_state;
+    double new_val, range = x->x_range;
+
+    x->x_state = state = state * 472940017 + 832416023;
+    new_val = range * ((double)state) * (1./4294967296.);
+    if(new_val >= range)
+	new_val = range-1;
+    new_val -= 32767.0;
+    return(new_val*(1.0/32767.0));
+}
+
+static void *sigLFO_noise_new(t_float freq)
+{
+    t_sigLFO_noise *x = (t_sigLFO_noise *)pd_new(sigLFO_noise_class);
+
+    x->x_range = 65535.0;
+    x->x_rcp_range =  (double)x->x_range * (1.0/4294967296.0);
+    x->x_state = sigLFO_noise_makeseed();
+    x->x_fact = 2. / 44100.0;
+    x->x_incr = freq * x->x_fact;
+    if(x->x_incr < 0.0)
+	x->x_incr = 0.0;
+    else if(x->x_incr > 0.1)
+	x->x_incr = 0.1;
+    x->x_y1 = sigLFO_noise_new_rand(x);
+    x->x_y2 = sigLFO_noise_new_rand(x);
+    x->x_phase = 0.0;
+    outlet_new(&x->x_obj, gensym("signal"));
+    return (x);
+}
+
+static t_int *sigLFO_noise_perform(t_int *w)
+{
+    t_float *out = (t_float *)(w[1]);
+    t_sigLFO_noise *x = (t_sigLFO_noise *)(w[2]);
+    int n = (int)(w[3]);
+    float phase = x->x_phase;
+    float x_y1 = x->x_y1;
+    float x_y2 = x->x_y2;
+    float incr = x->x_incr;
+
+    while(n--)
+    {
+	if(phase > 1.0)
+	{
+	    x_y1 = x_y2;
+	    x_y2 = sigLFO_noise_new_rand(x);
+            phase -= 1.0;
+	}
+	*out++ = (x_y2 - x_y1) * phase + x_y1;
+        phase += incr;
+    }
+    x->x_phase = phase;
+    x->x_y1 = x_y1;
+    x->x_y2 = x_y2;
+    return (w+4);
+}
+
+static void sigLFO_noise_float(t_sigLFO_noise *x, t_float freq)
+{
+    x->x_incr = freq * x->x_fact;
+    if(x->x_incr < 0.0)
+	x->x_incr = 0.0;
+    else if(x->x_incr > 0.1)
+	x->x_incr = 0.1;
+}
+
+static void sigLFO_noise_dsp(t_sigLFO_noise *x, t_signal **sp)
+{
+    x->x_fact = 2. / sp[0]->s_sr;
+    dsp_add(sigLFO_noise_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+}
+
+void sigLFO_noise_setup(void)
+{
+    sigLFO_noise_class = class_new(gensym("LFO_noise~"),
+    	(t_newmethod)sigLFO_noise_new, 0,
+    	sizeof(t_sigLFO_noise), 0, A_DEFFLOAT, 0);
+    class_addmethod(sigLFO_noise_class, (t_method)sigLFO_noise_dsp,
+    	gensym("dsp"), 0);
+    class_addfloat(sigLFO_noise_class, (t_method)sigLFO_noise_float);
+    class_sethelpsymbol(sigLFO_noise_class, gensym("iemhelp/help-LFO_noise~"));
+}
+