1 files changed, 110 insertions, 0 deletions
diff --git a/muse/synti/zynaddsubfx/Effects/EffectLFO.C b/muse/synti/zynaddsubfx/Effects/EffectLFO.C
new file mode 100644
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--- /dev/null
+++ b/muse/synti/zynaddsubfx/Effects/EffectLFO.C
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+/*
+  ZynAddSubFX - a software synthesizer
+ 
+  EffectLFO.C - Stereo LFO used by some effects
+  Copyright (C) 2002-2005 Nasca Octavian Paul
+  Author: Nasca Octavian Paul
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of version 2 of the GNU General Public License 
+  as published by the Free Software Foundation.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License (version 2) for more details.
+
+  You should have received a copy of the GNU General Public License (version 2)
+  along with this program; if not, write to the Free Software Foundation,
+  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "EffectLFO.h"
+
+
+EffectLFO::EffectLFO(){
+    xl=0.0;xr=0.0;
+    Pfreq=40;
+    Prandomness=0;
+    PLFOtype=0;
+    Pstereo=96;
+    
+    updateparams();
+
+    ampl1=(1-lfornd)+lfornd*RND;
+    ampl2=(1-lfornd)+lfornd*RND;
+    ampr1=(1-lfornd)+lfornd*RND;
+    ampr2=(1-lfornd)+lfornd*RND;
+};
+
+EffectLFO::~EffectLFO(){
+};
+
+
+/*
+ * Update the changed parameters
+ */
+void EffectLFO::updateparams(){
+    REALTYPE lfofreq=(pow(2,Pfreq/127.0*10.0)-1.0)*0.03;
+    incx=fabs(lfofreq)*(REALTYPE)SOUND_BUFFER_SIZE/(REALTYPE)SAMPLE_RATE;
+    if (incx>0.49999999) incx=0.499999999; //Limit the Frequency
+
+    lfornd=Prandomness/127.0;
+    if (lfornd<0.0) lfornd=0.0; else if (lfornd>1.0) lfornd=1.0;
+
+    if (PLFOtype>1) PLFOtype=1;//this has to be updated if more lfo's are added
+    lfotype=PLFOtype;
+
+    xr=fmod(xl+(Pstereo-64.0)/127.0+1.0,1.0);
+};
+
+
+/*
+ * Compute the shape of the LFO
+ */
+REALTYPE EffectLFO::getlfoshape(REALTYPE x){
+    REALTYPE out;
+    switch (lfotype){
+	case 1: //EffectLFO_TRIANGLE
+		if ((x>0.0)&&(x<0.25)) out=4.0*x;
+		else if ((x>0.25)&&(x<0.75)) out=2-4*x;
+		     else out=4.0*x-4.0;
+		break;
+	//more to be added here; also ::updateparams() need to be updated (to allow more lfotypes)
+	default:out=cos(x*2*PI);//EffectLFO_SINE
+    };
+    return(out);
+};
+
+/*
+ * LFO output
+ */
+void EffectLFO::effectlfoout(REALTYPE *outl,REALTYPE *outr){
+    REALTYPE out;    
+    
+    out=getlfoshape(xl);
+    if ((lfotype==0)||(lfotype==1)) out*=(ampl1+xl*(ampl2-ampl1));
+    xl+=incx;
+    if (xl>1.0) {
+	xl-=1.0;
+	ampl1=ampl2;
+	ampl2=(1.0-lfornd)+lfornd*RND;
+    };
+    *outl=(out+1.0)*0.5;
+
+    out=getlfoshape(xr);
+    if ((lfotype==0)||(lfotype==1)) out*=(ampr1+xr*(ampr2-ampr1));
+    xr+=incx;
+    if (xr>1.0) {
+	xr-=1.0;
+	ampr1=ampr2;
+	ampr2=(1.0-lfornd)+lfornd*RND;
+    };
+    *outr=(out+1.0)*0.5;
+};
+