Merge branchesHEADsvn2git-headmaster

- abstractions/tb
- externals/tb

1 files changed, 427 insertions, 0 deletions

diff --git a/tbext/source/him.cpp b/tbext/source/him.cpp
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+/* Copyright (c) 2004 Tim Blechmann.                                            */
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL     */
+/* WARRANTIES, see the file, "COPYING"  in this distribution.                   */
+/*                                                                              */
+/*                                                                              */
+/* him~ is a semi-classicical simulation of an hydrogen atom in a magnetic field*/
+/*                                                                              */
+/* him~ uses the flext C++ layer for Max/MSP and PD externals.                  */
+/* get it at http://www.parasitaere-kapazitaeten.de/PD/ext                      */
+/* thanks to Thomas Grill                                                       */
+/*                                                                              */
+/* him~ is based on code provided in the lecture "physik auf dem computer 1"    */
+/* held by joerg main during the winter semester 2003/04 at the university      */
+/* stuttgart ... many thanks to him and his assistant ralf habel                */
+/*                                                                              */
+/*                                                                              */
+/*                                                                              */
+/* This program is free software; you can redistribute it and/or                */
+/* modify it under the terms of the GNU General Public License                  */
+/* as published by the Free Software Foundation; either version 2               */
+/* of the License, or (at your option) any later version.                       */
+/*                                                                              */
+/* See file LICENSE for further informations on licensing terms.                */
+/*                                                                              */
+/* 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 for more details.                                 */
+/*                                                                              */
+/* You should have received a copy of the GNU General Public License            */
+/* along with this program; if not, write to the Free Software                  */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.  */
+/*                                                                              */
+/* Based on PureData by Miller Puckette and others.                             */
+/*                                                                              */
+/*                                                                              */
+/*                                                                              */
+/* coded while listening to: Elliott Sharp: The Velocity Of Hue                 */
+/*                           Fred Frith: Traffic Continues                      */
+/*                           Nmperign: Twisted Village                          */
+/*                           Frank Lowe: Black Beings                           */
+/*                                                                              */
+
+
+
+#include <flext.h>
+#include <cstdlib>
+#include <cmath>
+
+#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 401)
+#error upgrade your flext version!!!!!!
+#endif
+
+#define NUMB_EQ 4
+
+class him: public flext_dsp
+{
+  FLEXT_HEADER(him,flext_dsp);
+
+public: 
+    him(int argc, t_atom *argv);
+
+protected:
+    virtual void m_signal (int n, float *const *in, float *const *out);
+    virtual void m_dsp (int n, float *const *in, float *const *out);
+    
+    void set_mu(t_float);
+    void set_muv(t_float);
+    void set_nu(t_float);
+    void set_nuv(t_float);
+    void set_etilde(t_float);
+    void set_dt(t_float);
+    void set_regtime(bool);
+    void state();
+    void reset();
+
+private:
+    // contains DGL-System
+    t_float deriv(t_float x[],int eq);
+
+    // 4th order Runge Kutta update of the dynamical variables 
+    void runge_kutta_4(t_float dt);
+
+    //these are our data
+    t_float data[4]; //mu, muv, nu, nuv (semi-parabolische koordinaten)
+    t_float E;
+
+    //and these our settings
+    t_float dt;
+    bool regtime; //if true "regularisierte zeit"
+
+    bool xfade;
+    t_float newE;
+    t_float newdt;
+    bool newsystem;
+    bool newregtime;
+
+    t_float * m_fader;
+
+    //Callbacks
+    FLEXT_CALLBACK_1(set_mu,t_float);
+    FLEXT_CALLBACK_1(set_muv,t_float);
+    FLEXT_CALLBACK_1(set_nu,t_float);
+    FLEXT_CALLBACK_1(set_nuv,t_float);
+    FLEXT_CALLBACK_1(set_etilde,t_float);
+    FLEXT_CALLBACK_1(set_dt,t_float);
+    FLEXT_CALLBACK_1(set_regtime,bool);
+    FLEXT_CALLBACK(state);
+    FLEXT_CALLBACK(reset);
+
+    //reset mus / nus 
+    void reset_nuv()
+    {
+	data[3]= 0.5*sqrt( - (4*data[1]*data[1]) - 
+			   ( data[0]*data[0]*data[1]*data[1]*data[1]*data[1])
+			   + (8*E*data[0]) - (8*E*data[2]) - 
+			   (data[0]*data[0]*data[0]*data[0]*data[1]*data[1])
+			   + 16);
+     	if (fabs((data[3]))<1e-5)
+ 	    data[3]=0;
+    }
+    
+    void reset_muv()
+    {
+	data[1]= 0.5*sqrt( - (4*data[3]*data[3]) - 
+			   ( data[0]*data[0]*data[1]*data[1]*data[1]*data[1])
+			   + (8*E*data[0]) - (8*E*data[2]) - 
+			   (data[0]*data[0]*data[0]*data[0]*data[1]*data[1])
+			   + 16);
+ 	if (fabs((data[1]))<1e-5)
+ 	    data[1]=0;
+    }
+    
+};
+
+
+FLEXT_LIB_DSP_V("him~",him)
+
+him::him(int argc, t_atom *argv)
+{
+    AddInAnything();
+    AddOutSignal();
+    AddOutSignal();
+    AddOutSignal();
+    AddOutSignal();
+    AddOutSignal();
+    AddOutSignal();
+    FLEXT_ADDMETHOD_F(0,"mu",set_mu);
+    FLEXT_ADDMETHOD_F(0,"muv",set_muv);
+    FLEXT_ADDMETHOD_F(0,"nu",set_nu);
+    FLEXT_ADDMETHOD_F(0,"nuv",set_nuv);
+    FLEXT_ADDMETHOD_F(0,"e",set_etilde);
+    FLEXT_ADDMETHOD_F(0,"dt",set_dt);
+    FLEXT_ADDMETHOD_B(0,"regtime",set_regtime);
+    FLEXT_ADDMETHOD_(0,"state",state);
+    FLEXT_ADDMETHOD_(0,"reset",reset);
+    
+    
+    //beginning values
+    if (argc==1)
+	E=atom_getfloat(argv);
+    else
+	E= -float(rand())/float(RAND_MAX);
+    
+    reset();
+
+    state();
+
+    //default mode
+    regtime=true;
+    dt=0.01;
+} 
+
+inline t_float him::deriv(t_float * x, int eq)
+{
+    t_float result;
+    // set DGL-System here
+    if (eq == 0) result =  x[1];
+    if (eq == 1) result = 2*E*x[0]-0.25*x[0]*x[2]*x[2]*(2*x[0]*x[0]+x[2]*x[2]);
+    if (eq == 2) result =  x[3];
+    if (eq == 3) result = 2*E*x[2]-0.25*x[2]*x[0]*x[0]*(2*x[2]*x[2]+x[0]*x[0]);
+
+  return result;
+}
+
+inline void him::runge_kutta_4(t_float dt)                          
+{
+    t_float k1[NUMB_EQ],k2[NUMB_EQ],k3[NUMB_EQ],k4[NUMB_EQ];
+    t_float temp1[NUMB_EQ], temp2[NUMB_EQ], temp3[NUMB_EQ];
+    
+    for(int i=0;i<=NUMB_EQ-1;i++) // iterate over equations 
+    {
+	k1[i] = dt * deriv(data,i);
+	temp1[i] = data[i] + 0.5*k1[i];	    	    
+    }
+    
+    for(int i=0;i<=NUMB_EQ-1;i++)
+    {
+	k2[i] = dt * deriv(temp1,i);
+	temp2[i] = data[i] + 0.5*k2[i];
+    }
+    
+    for(int i=0;i<=NUMB_EQ-1;i++)
+    {
+	k3[i] = dt * deriv(temp2,i);
+	temp3[i] = data[i] + k3[i];    
+    }
+    
+    for(int i=0;i<=NUMB_EQ-1;i++)
+    {
+	k4[i] = dt * deriv(temp3,i);
+	data[i] = data[i] + (k1[i] + (2.*(k2[i]+k3[i])) + k4[i])/6.;
+    	
+	// we don't want to experience denormals in the next step */
+	if(fabs((data[i]))<1e-5)   
+	    data[i]=0;
+    }
+
+    
+    /*
+      the system might become unstable ... in this case, we'll request a new system
+    */    
+
+    for(int i=0;i<=NUMB_EQ-1;i++)
+    {
+	if(data[i]>2)
+	    {
+		xfade = newsystem =  true;
+		data[i] = 2;
+	    }
+	if(data[i]<-2)
+	    {
+		xfade = newsystem = true;
+		data[i] = -2;
+	    }
+    }
+}
+
+
+
+void him::m_signal(int n, t_float *const *in, t_float *const *out)
+{
+    t_float * out0 = out[0];
+    t_float * out1 = out[1];
+    t_float * out2 = out[2];
+    t_float * out3 = out[3];
+    t_float * out4 = out[4];
+    t_float * out5 = out[5];
+
+    
+    if (regtime)
+    {
+	for (int i=0;i!=n;++i)
+	{
+	    runge_kutta_4(dt);
+	    (*(out0)++)=data[0];
+	    (*(out1)++)=data[1];
+	    (*(out2)++)=data[2];
+	    (*(out3)++)=data[3];
+	    (*(out4)++)=data[0]*data[2];
+	    (*(out5)++)=(data[0]*data[0]-data[2]*data[2])*0.5;
+	}
+    }
+    else
+    {
+	for (int i=0;i!=n;++i)
+	{
+	    runge_kutta_4(dt/(2*sqrt(data[0]*data[0]+data[2]*data[2])));
+	    (*(out0)++)=data[0];
+	    (*(out1)++)=data[1];
+	    (*(out2)++)=data[2];
+	    (*(out3)++)=data[3];
+	    (*(out4)++)=data[0]*data[2];
+	    (*(out5)++)=(data[0]*data[0]-data[2]*data[2])*0.5;
+	}
+    }
+    
+    if (xfade)
+    {
+	/* fading */
+	out0 = out[0];
+	out1 = out[1];
+	out2 = out[2];
+	out3 = out[3];
+	out4 = out[4];
+	out5 = out[5];
+	
+	t_float * fader = m_fader + n - 1;
+	for (int i=0;i!=n;++i)
+	{
+	    (*(out0)++) *= *fader;
+	    (*(out1)++) *= *fader;
+	    (*(out2)++) *= *fader;
+	    (*(out3)++) *= *fader;
+	    (*(out4)++) *= *fader;
+	    (*(out5)++) *= *fader--;
+	}
+
+	if (newsystem)
+	{
+	    reset();
+	    newsystem = false;
+	}
+	
+	E = newE;
+	dt = newdt;
+	regtime = newregtime;
+
+	out0 = out[0];
+	out1 = out[1];
+	out2 = out[2];
+	out3 = out[3];
+	out4 = out[4];
+	out5 = out[5];
+    
+	fader = m_fader;
+	if (regtime)
+	{
+	    for (int i=0;i!=n;++i)
+	    {
+		runge_kutta_4(dt);
+		(*(out0)++)+= data[0]* *fader;
+		(*(out1)++)+= data[1]* *fader;
+		(*(out2)++)+= data[2]* *fader;
+		(*(out3)++)+= data[3]* *fader;
+		(*(out4)++)+= data[0]*data[2]* *fader;
+		(*(out5)++)+= (data[0]*data[0]-data[2]*data[2])*0.5* *fader++;
+	    }
+	}
+	else
+	{
+	    for (int i=0;i!=n;++i)
+	    {
+		runge_kutta_4(dt/(2*sqrt(data[0]*data[0]+data[2]*data[2])));
+		(*(out0)++)+= data[0]* *fader;
+		(*(out1)++)+= data[1]* *fader;
+		(*(out2)++)+= data[2]* *fader;
+		(*(out3)++)+= data[3]* *fader;
+		(*(out4)++)+= data[0]*data[2]* *fader;
+		(*(out5)++)+= (data[0]*data[0]-data[2]*data[2])*0.5* *fader++;
+	    }
+	}
+	
+	xfade = false;
+    }
+    
+}    
+
+void him::m_dsp(int n, t_float *const *in, t_float *const *out)
+{
+    m_fader = new t_float[n];
+    t_float on = 1.f/(n-1);
+    
+    t_float value = 0;
+
+    t_float* localfader = m_fader;
+
+    while (n--)
+    {
+	*localfader = value;
+	value += on;
+	++localfader;
+    }
+    xfade = false;
+}
+
+
+void him::set_mu(t_float f)
+{
+    data[0]=f;
+    reset_nuv();
+}
+
+void him::set_muv(t_float f)
+{
+    data[1]=f;
+    reset_nuv();
+}
+
+void him::set_nu(t_float f)
+{
+    data[3]=f;
+    reset_nuv();
+}
+
+void him::set_nuv(t_float f)
+{
+    data[3]=f;
+    reset_muv();
+}
+
+void him::set_etilde(t_float f)
+{
+    newE=f;
+    xfade = true;
+    //reset_nuv();
+}
+
+void him::set_dt(t_float f)
+{
+    newdt=f;
+    xfade = true;
+}
+
+void him::set_regtime(bool b)
+{
+    newregtime=b;
+    xfade = true;
+}
+
+
+void him::state()
+{
+    post("mu %f",data[0]);
+    post("mus %f",data[1]);
+    post("nu %f",data[2]);
+    post("nus %f",data[3]);
+    post("etilde %f",E);
+}
+
+void him::reset()
+{
+    data[0]=float(rand())/float(RAND_MAX);
+    data[1]=float(rand())/float(RAND_MAX);
+    data[2]=float(rand())/float(RAND_MAX);
+    reset_nuv();
+}