Version 4.0

include/Mesh2D.h

@@ -0,0 +1,105 @@
+/***************************************************/
+/*! \class Mesh2D
+    \brief Two-dimensional rectilinear waveguide mesh class.
+
+    This class implements a rectilinear,
+    two-dimensional digital waveguide mesh
+    structure.  For details, see Van Duyne and
+    Smith, "Physical Modeling with the 2-D Digital
+    Waveguide Mesh", Proceedings of the 1993
+    International Computer Music Conference.
+
+    This is a digital waveguide model, making its
+    use possibly subject to patents held by Stanford
+    University, Yamaha, and others.
+
+    Control Change Numbers: 
+       - X Dimension = 2
+       - Y Dimension = 4
+       - Mesh Decay = 11
+       - X-Y Input Position = 1
+
+    by Julius Smith, 2000 - 2002.
+    Revised by Gary Scavone for STK, 2002.
+*/
+/***************************************************/
+
+#if !defined(__MESH2D_H)
+#define __MESH2D_H
+
+#include "Instrmnt.h"
+#include "OnePole.h"
+
+#define NXMAX ((short)(12))
+#define NYMAX ((short)(12))
+
+class Mesh2D : public Instrmnt
+{
+ public:
+  //! Class constructor, taking the x and y dimensions in samples.
+  Mesh2D(short nX, short nY);
+
+  //! Class destructor.
+  ~Mesh2D();
+
+  //! Reset and clear all internal state.
+  void clear(); 
+
+  //! Set the x dimension size in samples.
+  void setNX(short lenX);
+
+  //! Set the y dimension size in samples.
+  void setNY(short lenY);
+
+  //! Set the x, y input position on a 0.0 - 1.0 scale.
+  void setInputPosition(MY_FLOAT xFactor, MY_FLOAT yFactor);
+
+  //! Set the loss filters gains (0.0 - 1.0).
+  void setDecay(MY_FLOAT decayFactor);
+
+  //! Impulse the mesh with the given amplitude (frequency ignored).
+  void noteOn(MY_FLOAT frequency, MY_FLOAT amplitude);
+
+  //! Stop a note with the given amplitude (speed of decay) ... currently ignored.
+  void noteOff(MY_FLOAT amplitude);
+
+  //! Calculate and return the signal energy stored in the mesh.
+  MY_FLOAT energy();
+
+  //! Compute one output sample, without adding energy to the mesh.
+  MY_FLOAT tick();
+
+  //! Input a sample to the mesh and compute one output sample.
+  MY_FLOAT tick(MY_FLOAT input);
+
+  //! Perform the control change specified by \e number and \e value (0.0 - 128.0).
+  void controlChange(int number, MY_FLOAT value);
+
+ protected:
+
+  MY_FLOAT tick0();
+  MY_FLOAT tick1();
+  void clearMesh();
+
+  short NX, NY;
+  short xInput, yInput;
+  OnePole *filterX[NXMAX];
+  OnePole *filterY[NYMAX];
+  MY_FLOAT v[NXMAX-1][NYMAX-1]; // junction velocities
+  MY_FLOAT vxp[NXMAX][NYMAX]; // positive-x velocity wave
+  MY_FLOAT vxm[NXMAX][NYMAX]; // negative-x velocity wave
+  MY_FLOAT vyp[NXMAX][NYMAX]; // positive-y velocity wave
+  MY_FLOAT vym[NXMAX][NYMAX]; // negative-y velocity wave
+
+  // Alternate buffers
+  MY_FLOAT vxp1[NXMAX][NYMAX]; // positive-x velocity wave
+  MY_FLOAT vxm1[NXMAX][NYMAX]; // negative-x velocity wave
+  MY_FLOAT vyp1[NXMAX][NYMAX]; // positive-y velocity wave
+  MY_FLOAT vym1[NXMAX][NYMAX]; // negative-y velocity wave
+
+  int counter; // time in samples
+
+
+};
+
+#endif