Move implementation private files from com.jogamp.<module>.impl. to jogamp.<module> (1/2) - rename task

- com.jogamp.opengl.impl                     -> jogamp.opengl
- com.jogamp.opengl.util.glsl.fixedfunc.impl -> jogamp.opengl.util.glsl.fixedfunc
- com.jogamp.nativewindow.impl               -> jogamp.nativewindow
- com.jogamp.newt.impl                       -> jogamp.newt

This sorts implementation details from the top level, ie skipping the public 'com',
allowing a better seperation of public classes and implementation details
and also reduces strings.

This approach of public/private seperation is also used in the OpenJDK.

4 files changed, 1333 insertions, 0 deletions

diff --git a/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2Backend.java b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2Backend.java
new file mode 100644
index 000000000..42ddeea50
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2Backend.java
@@ -0,0 +1,49 @@
+package com.jogamp.opengl.impl.glu.gl2.nurbs;
+import com.jogamp.opengl.impl.glu.nurbs.*;
+
+/*
+ ** License Applicability. Except to the extent portions of this file are
+ ** made subject to an alternative license as permitted in the SGI Free
+ ** Software License B, Version 2.0 (the "License"), the contents of this
+ ** file are subject only to the provisions of the License. You may not use
+ ** this file except in compliance with the License. You may obtain a copy
+ ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+ ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+ **
+ ** http://oss.sgi.com/projects/FreeB
+ **
+ ** Note that, as provided in the License, the Software is distributed on an
+ ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+ ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+ ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+ ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+ **
+ ** Original Code. The Original Code is: OpenGL Sample Implementation,
+ ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+ ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+ ** Copyright in any portions created by third parties is as indicated
+ ** elsewhere herein. All Rights Reserved.
+ **
+ ** Additional Notice Provisions: The application programming interfaces
+ ** established by SGI in conjunction with the Original Code are The
+ ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+ ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+ ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+ ** Window System(R) (Version 1.3), released October 19, 1998. This software
+ ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+ ** published by SGI, but has not been independently verified as being
+ ** compliant with the OpenGL(R) version 1.2.1 Specification.
+ */
+
+/**
+ * Class responsible for rendering
+ * @author Tomas Hrasky
+ *
+ */
+public class GL2Backend extends Backend {
+  public GL2Backend() {
+    super();
+    curveEvaluator = new GL2CurveEvaluator();
+    surfaceEvaluator = new GL2SurfaceEvaluator();
+  }
+}
diff --git a/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2CurveEvaluator.java b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2CurveEvaluator.java
new file mode 100644
index 000000000..adb8c51d8
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2CurveEvaluator.java
@@ -0,0 +1,205 @@
+package com.jogamp.opengl.impl.glu.gl2.nurbs;
+import com.jogamp.opengl.impl.glu.nurbs.*;
+
+/*
+ ** License Applicability. Except to the extent portions of this file are
+ ** made subject to an alternative license as permitted in the SGI Free
+ ** Software License B, Version 2.0 (the "License"), the contents of this
+ ** file are subject only to the provisions of the License. You may not use
+ ** this file except in compliance with the License. You may obtain a copy
+ ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+ ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+ **
+ ** http://oss.sgi.com/projects/FreeB
+ **
+ ** Note that, as provided in the License, the Software is distributed on an
+ ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+ ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+ ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+ ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+ **
+ ** Original Code. The Original Code is: OpenGL Sample Implementation,
+ ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+ ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+ ** Copyright in any portions created by third parties is as indicated
+ ** elsewhere herein. All Rights Reserved.
+ **
+ ** Additional Notice Provisions: The application programming interfaces
+ ** established by SGI in conjunction with the Original Code are The
+ ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+ ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+ ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+ ** Window System(R) (Version 1.3), released October 19, 1998. This software
+ ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+ ** published by SGI, but has not been independently verified as being
+ ** compliant with the OpenGL(R) version 1.2.1 Specification.
+ */
+
+import javax.media.opengl.GL;
+import javax.media.opengl.GL2;
+import javax.media.opengl.glu.GLU;
+import javax.media.opengl.glu.gl2.GLUgl2;
+
+/**
+ * Class rendering curves with OpenGL
+ * @author Tomáš Hráský
+ *
+ */
+class GL2CurveEvaluator implements CurveEvaluator {
+
+  /**
+   * Output triangles (for callback) or render curve 
+   */
+  private boolean output_triangles;
+
+  /**
+   * OpenGL object
+   */
+  private GL2 gl;
+
+  /**
+   * Not used
+   */
+  private int vertex_flag;
+
+  /**
+   * Not used
+   */
+  private int normal_flag;
+
+  /**
+   * Not used
+   */
+  private int color_flag;
+
+  /**
+   * Not used
+   */
+  private int texcoord_flag;
+
+  /**
+   * Number of bezier arc - used for color distinguishing of arcs forming NURBS curve
+   */
+  private int poradi;
+
+  /**
+   * Makes new Evaluator
+   */
+  public GL2CurveEvaluator() {
+    gl = GLUgl2.getCurrentGL2();
+  }
+
+  /**
+   * Pushes eval bit
+   */
+  public void bgnmap1f() {
+    // DONE
+    if (output_triangles) {
+      vertex_flag = 0;
+      normal_flag = 0;
+      color_flag = 0;
+      texcoord_flag = 0;
+    } else {
+      gl.glPushAttrib(GL2.GL_EVAL_BIT);
+    }
+
+  }
+
+  /**
+   * Pops all OpenGL attributes
+   */
+  public void endmap1f() {
+    // DONE
+    if (output_triangles) {
+
+    } else {
+      gl.glPopAttrib();
+    }
+
+  }
+
+  /**
+   * Initializes opengl evaluator
+   * @param type curve type
+   * @param ulo lowest u
+   * @param uhi highest u
+   * @param stride control point coords
+   * @param order curve order
+   * @param ps control points
+   */
+  public void map1f(int type, float ulo, float uhi, int stride, int order,
+                    CArrayOfFloats ps) {
+    if (output_triangles) {
+      // TODO code for callback (output_triangles probably indicates callback)
+      //				System.out.println("TODO curveevaluator.map1f-output_triangles");
+    } else {
+      gl.glMap1f(type, ulo, uhi, stride, order, ps.getArray(), ps
+                 .getPointer());
+
+      // DEBUG - drawing bézier control points
+      // gl.glColor3d(.5,.5,.5);
+      // gl.glPointSize(5);
+      // gl.glBegin(GL2.GL_POINTS);
+      // float[] ctrlpoints=ps.getArray();
+      // for(int i=ps.getPointer();i<ps.getPointer()+order;i++){
+      // gl.glVertex3d(ctrlpoints[i * 4], ctrlpoints[i * 4 + 1],0);
+      // }
+      // gl.glEnd();
+    }
+
+  }
+
+  /**
+   * Calls opengl enable
+   * @param type what to enable
+   */
+  public void enable(int type) {
+    // DONE
+    gl.glEnable(type);
+  }
+
+  /**
+   * Calls glMapGrid1f
+   * @param nu steps
+   * @param u1 low u
+   * @param u2 high u
+   */
+  public void mapgrid1f(int nu, float u1, float u2) {
+    if (output_triangles) {
+      //				System.out.println("TODO curveevaluator.mapgrid1f");
+    } else
+      gl.glMapGrid1f(nu, u1, u2);
+    //			// System.out.println("upravit NU");
+    // gl.glMapGrid1f(50,u1,u2);
+  }
+
+  /**
+   * Evaluates a curve using glEvalMesh1f
+   * @param style Backend.N_MESHFILL/N_MESHLINE/N_MESHPOINT
+   * @param from lowest param
+   * @param to highest param
+   */
+  public void mapmesh1f(int style, int from, int to) {
+    /* //DEBUG drawing control points
+       this.poradi++;
+       if (poradi % 2 == 0)
+       gl.glColor3f(1, 0, 0);
+       else
+       gl.glColor3f(0, 1, 0);
+    */
+    if (output_triangles) {
+      // TODO code for callback
+      //			System.out.println("TODO openglcurveevaluator.mapmesh1f output_triangles");
+    } else {
+      switch (style) {
+      case Backend.N_MESHFILL:
+      case Backend.N_MESHLINE:
+        gl.glEvalMesh1(GL2.GL_LINE, from, to);
+        break;
+      case Backend.N_MESHPOINT:
+        gl.glEvalMesh1(GL2.GL_POINT, from, to);
+        break;
+      }
+    }
+  }
+}
diff --git a/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2SurfaceEvaluator.java b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2SurfaceEvaluator.java
new file mode 100644
index 000000000..393601ff7
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GL2SurfaceEvaluator.java
@@ -0,0 +1,217 @@
+package com.jogamp.opengl.impl.glu.gl2.nurbs;
+import com.jogamp.opengl.impl.glu.nurbs.*;
+
+/*
+ ** License Applicability. Except to the extent portions of this file are
+ ** made subject to an alternative license as permitted in the SGI Free
+ ** Software License B, Version 2.0 (the "License"), the contents of this
+ ** file are subject only to the provisions of the License. You may not use
+ ** this file except in compliance with the License. You may obtain a copy
+ ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+ ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+ **
+ ** http://oss.sgi.com/projects/FreeB
+ **
+ ** Note that, as provided in the License, the Software is distributed on an
+ ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+ ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+ ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+ ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+ **
+ ** Original Code. The Original Code is: OpenGL Sample Implementation,
+ ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+ ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+ ** Copyright in any portions created by third parties is as indicated
+ ** elsewhere herein. All Rights Reserved.
+ **
+ ** Additional Notice Provisions: The application programming interfaces
+ ** established by SGI in conjunction with the Original Code are The
+ ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+ ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+ ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+ ** Window System(R) (Version 1.3), released October 19, 1998. This software
+ ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+ ** published by SGI, but has not been independently verified as being
+ ** compliant with the OpenGL(R) version 1.2.1 Specification.
+ */
+
+import javax.media.opengl.GL;
+import javax.media.opengl.GL2;
+import javax.media.opengl.glu.GLU;
+import javax.media.opengl.glu.gl2.GLUgl2;
+
+/**
+ * Class rendering surfaces with OpenGL
+ * @author Tomas Hrasky
+ *
+ */
+class GL2SurfaceEvaluator implements SurfaceEvaluator {
+
+  /**
+   * JOGL OpenGL object
+   */
+  private GL2 gl;
+
+  /**
+   * Output triangles (callback)
+   */
+  private boolean output_triangles;
+
+  /**
+   * Number of patch - used for distinguishing bezier plates forming NURBS surface with different colors
+   */
+  private int poradi;
+
+  /**
+   * Creates new evaluator
+   */
+  public GL2SurfaceEvaluator() {
+    gl = GLUgl2.getCurrentGL2();
+  }
+
+  /**
+   * Pushes eval bit
+   */
+  public void bgnmap2f() {
+
+    if (output_triangles) {
+      // TODO outp triangles surfaceevaluator bgnmap2f
+      //			System.out.println("TODO surfaceevaluator.bgnmap2f output triangles");
+    } else {
+      gl.glPushAttrib(GL2.GL_EVAL_BIT);
+      //				System.out.println("TODO surfaceevaluator.bgnmap2f glgetintegerv");
+    }
+
+  }
+
+  /**
+   * Sets  glPolygonMode
+   * @param style polygon mode (N_MESHFILL/N_MESHLINE/N_MESHPOINT)
+   */
+  public void polymode(int style) {
+    if (!output_triangles) {
+      switch (style) {
+      default:
+      case NurbsConsts.N_MESHFILL:
+        gl.glPolygonMode(GL2.GL_FRONT_AND_BACK, GL2.GL_FILL);
+        break;
+      case NurbsConsts.N_MESHLINE:
+        gl.glPolygonMode(GL2.GL_FRONT_AND_BACK, GL2.GL_LINE);
+        break;
+      case NurbsConsts.N_MESHPOINT:
+        gl.glPolygonMode(GL2.GL_FRONT_AND_BACK, GL2.GL_POINT);
+        break;
+      }
+    }
+
+  }
+
+  /**
+   * Pops all attributes
+   */
+  public void endmap2f() {
+    // TODO Auto-generated method stub
+    if (output_triangles) {
+      //			System.out.println("TODO surfaceevaluator.endmap2f output triangles");
+    } else {
+      gl.glPopAttrib();
+      // TODO use LOD
+    }
+  }
+
+  /**
+   * Empty method
+   * @param ulo
+   * @param uhi
+   * @param vlo
+   * @param vhi
+   */
+  public void domain2f(float ulo, float uhi, float vlo, float vhi) {
+    // DONE
+  }
+
+  /**
+   * Defines 2D mesh
+   * @param nu number of steps in u direction
+   * @param u0 lowest u
+   * @param u1 highest u
+   * @param nv number of steps in v direction
+   * @param v0 lowest v
+   * @param v1 highest v
+   */
+  public void mapgrid2f(int nu, float u0, float u1, int nv, float v0, float v1) {
+
+    if (output_triangles) {
+      //			System.out.println("TODO openglsurfaceavaluator.mapgrid2f output_triangles");
+    } else {
+      gl.glMapGrid2d(nu, u0, u1, nv, v0, v1);
+    }
+
+  }
+
+  /**
+   * Evaluates surface
+   * @param style surface style
+   * @param umin minimum U
+   * @param umax maximum U
+   * @param vmin minimum V
+   * @param vmax maximum V
+   */
+  public void mapmesh2f(int style, int umin, int umax, int vmin, int vmax) {
+    if (output_triangles) {
+      //			System.out.println("TODO openglsurfaceavaluator.mapmesh2f output_triangles");
+    } else {
+      /* //DEBUG - draw control points
+         this.poradi++;
+         if (poradi % 2 == 0)
+         gl.glColor3f(1, 0, 0);
+         else if (poradi % 2 == 1)
+         gl.glColor3f(0, 1, 0);
+      */
+      switch (style) {
+      case NurbsConsts.N_MESHFILL:
+        gl.glEvalMesh2(GL2.GL_FILL, umin, umax, vmin, vmax);
+        break;
+      case NurbsConsts.N_MESHLINE:
+        gl.glEvalMesh2(GL2.GL_LINE, umin, umax, vmin, vmax);
+        break;
+      case NurbsConsts.N_MESHPOINT:
+        gl.glEvalMesh2(GL2.GL_POINT, umin, umax, vmin, vmax);
+        break;
+      }
+    }
+  }
+
+  /**
+   * Initializes evaluator
+   * @param type surface type
+   * @param ulo lowest u
+   * @param uhi highest u
+   * @param ustride number of objects between control points in u direction
+   * @param uorder surface order in u direction
+   * @param vlo lowest v
+   * @param vhi highest v
+   * @param vstride number of control points' coords
+   * @param vorder surface order in v direction
+   * @param pts control points
+   */
+  public void map2f(int type, float ulo, float uhi, int ustride, int uorder,
+                    float vlo, float vhi, int vstride, int vorder, CArrayOfFloats pts) {
+    // TODO Auto-generated method stub
+    if (output_triangles) {
+      //			System.out.println("TODO openglsurfaceevaluator.map2f output_triangles");
+    } else {
+      gl.glMap2f(type, ulo, uhi, ustride, uorder, vlo, vhi, vstride,
+                 vorder, pts.getArray(), pts.getPointer());
+    }
+  }
+
+  /**
+   * Calls opengl enable
+   * @param type what to enable
+   */
+  public void enable(int type) {
+    //DONE
+    gl.glEnable(type);
+  }
+}
diff --git a/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GLUgl2nurbsImpl.java b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GLUgl2nurbsImpl.java
new file mode 100644
index 000000000..13b68138c
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/glu/gl2/nurbs/GLUgl2nurbsImpl.java
@@ -0,0 +1,862 @@
+package com.jogamp.opengl.impl.glu.gl2.nurbs;
+import com.jogamp.opengl.impl.glu.nurbs.*;
+
+/*
+ ** License Applicability. Except to the extent portions of this file are
+ ** made subject to an alternative license as permitted in the SGI Free
+ ** Software License B, Version 2.0 (the "License"), the contents of this
+ ** file are subject only to the provisions of the License. You may not use
+ ** this file except in compliance with the License. You may obtain a copy
+ ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+ ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+ **
+ ** http://oss.sgi.com/projects/FreeB
+ **
+ ** Note that, as provided in the License, the Software is distributed on an
+ ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+ ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+ ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+ ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+ **
+ ** Original Code. The Original Code is: OpenGL Sample Implementation,
+ ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+ ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+ ** Copyright in any portions created by third parties is as indicated
+ ** elsewhere herein. All Rights Reserved.
+ **
+ ** Additional Notice Provisions: The application programming interfaces
+ ** established by SGI in conjunction with the Original Code are The
+ ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+ ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+ ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+ ** Window System(R) (Version 1.3), released October 19, 1998. This software
+ ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+ ** published by SGI, but has not been independently verified as being
+ ** compliant with the OpenGL(R) version 1.2.1 Specification.
+ */
+
+import java.lang.reflect.Method;
+
+import javax.media.opengl.GL;
+import javax.media.opengl.GL2;
+import javax.media.opengl.glu.GLUnurbs;
+
+/**
+ * Base object for working with NURBS curves and surfaces
+ * 
+ * @author Tomas Hrasky
+ * 
+ */
+public class GLUgl2nurbsImpl implements GLUnurbs {
+
+  /**
+   * Curve type - no type
+   */
+  public static final int CT_NONE = 0;
+
+  /**
+   * Curve type - NURBS curve
+   */
+  public static final int CT_NURBSCURVE = 1;
+
+  /**
+   * Curve type - picewise linear curve
+   */
+  public static final int CT_NPWLCURVE = 2;
+
+  /**
+   * Matrixes autoloading
+   */
+  private boolean autoloadmode;
+
+  /**
+   * Using callback
+   */
+  private int callBackFlag;
+
+  /**
+   * Object for error call backs
+   */
+  private Object errorCallback;
+
+  /**
+   * List of map definitions
+   */
+  Maplist maplist;
+
+  /**
+   * Indicates validity of data
+   */
+  private int isDataValid;
+
+  /**
+   * Are we in the middle of curve processing
+   */
+  private int inCurve;
+
+  /**
+   * Current curve
+   */
+  private O_curve currentCurve;
+
+  /**
+   * Are we in trim
+   */
+  private boolean inTrim;
+
+  /**
+   * Are we playbacking curve/surface rendering
+   */
+  private boolean playBack;
+
+  /**
+   * Next curve in linked list
+   */
+  private O_curve nextCurve;
+
+  /**
+   * Is curve modified
+   */
+  private int isCurveModified;
+
+  /**
+   * Object holding rendering settings
+   */
+  private Renderhints renderhints;
+
+  /**
+   * Display list
+   */
+  private DisplayList dl;
+
+  /**
+   * Object for subdividing curves and surfaces
+   */
+  private Subdivider subdivider;
+
+  /**
+   * Object responsible for rendering
+   */
+  private Backend backend;
+
+  /**
+   * Next picewise linear curve in linked list
+   */
+  private O_pwlcurve nextPwlcurve;
+
+  /**
+   * Next trimming NURBS curve in linked list
+   */
+  private O_nurbscurve nextNurbscurve;
+
+  /**
+   * Are we in the middle of surface processing
+   */
+  private int inSurface;
+
+  /**
+   * Are there any changes in trimming
+   */
+  private boolean isTrimModified;
+
+  /**
+   * Are there any changes in surface data
+   */
+  private boolean isDataSurfaceModified;
+
+  /**
+   * Nurber of trmims of processed surface
+   */
+  private int numTrims;
+
+  /**
+   * Current processed surface
+   */
+  private O_surface currentSurface;
+
+  /**
+   * Next trimming curve
+   */
+  private O_trim nextTrim;
+
+  /**
+   * Nextr surface in linked list
+   */
+  private O_nurbssurface nextNurbssurface;
+
+  /**
+   * Are there any changes in surface
+   */
+  private boolean isSurfaceModified;
+
+  /**
+   * Initializes default GLUgl2nurbs object
+   */
+  public GLUgl2nurbsImpl() {
+    // DONE
+    maplist = new Maplist(backend);
+    renderhints = new Renderhints();
+    subdivider = new Subdivider();
+    // original code
+
+    redefineMaps();
+
+    defineMap(GL2.GL_MAP2_NORMAL, 0, 3);
+    defineMap(GL2.GL_MAP1_NORMAL, 0, 3);
+    defineMap(GL2.GL_MAP2_TEXTURE_COORD_1, 0, 1);
+    defineMap(GL2.GL_MAP1_TEXTURE_COORD_1, 0, 1);
+    defineMap(GL2.GL_MAP2_TEXTURE_COORD_2, 0, 2);
+    defineMap(GL2.GL_MAP1_TEXTURE_COORD_2, 0, 2);
+    defineMap(GL2.GL_MAP2_TEXTURE_COORD_3, 0, 3);
+    defineMap(GL2.GL_MAP1_TEXTURE_COORD_3, 0, 3);
+    defineMap(GL2.GL_MAP2_TEXTURE_COORD_4, 1, 4);
+    defineMap(GL2.GL_MAP1_TEXTURE_COORD_4, 1, 4);
+    defineMap(GL2.GL_MAP2_VERTEX_4, 1, 4);
+    defineMap(GL2.GL_MAP1_VERTEX_4, 1, 4);
+    defineMap(GL2.GL_MAP2_VERTEX_3, 0, 3);
+    defineMap(GL2.GL_MAP1_VERTEX_3, 0, 3);
+    defineMap(GL2.GL_MAP2_COLOR_4, 0, 4);
+    defineMap(GL2.GL_MAP1_COLOR_4, 0, 4);
+    defineMap(GL2.GL_MAP2_INDEX, 0, 1);
+    defineMap(GL2.GL_MAP1_INDEX, 0, 1);
+
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_3, NurbsConsts.N_SAMPLINGMETHOD,
+                     (float) NurbsConsts.N_PATHLENGTH);
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_4, NurbsConsts.N_SAMPLINGMETHOD,
+                     (float) NurbsConsts.N_PATHLENGTH);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_3, NurbsConsts.N_SAMPLINGMETHOD,
+                     (float) NurbsConsts.N_PATHLENGTH);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_4, NurbsConsts.N_SAMPLINGMETHOD,
+                     (float) NurbsConsts.N_PATHLENGTH);
+
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_3, NurbsConsts.N_PIXEL_TOLERANCE,
+                     (float) 50.0);
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_4, NurbsConsts.N_PIXEL_TOLERANCE,
+                     (float) 50.0);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_3, NurbsConsts.N_PIXEL_TOLERANCE,
+                     (float) 50.0);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_4, NurbsConsts.N_PIXEL_TOLERANCE,
+                     (float) 50.0);
+
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_3, NurbsConsts.N_ERROR_TOLERANCE,
+                     (float) 0.50);
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_4, NurbsConsts.N_ERROR_TOLERANCE,
+                     (float) 0.50);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_3, NurbsConsts.N_ERROR_TOLERANCE,
+                     (float) 0.50);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_4, NurbsConsts.N_ERROR_TOLERANCE,
+                     (float) 0.50);
+
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_3, NurbsConsts.N_S_STEPS,
+                     (float) 100.0);
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_4, NurbsConsts.N_S_STEPS,
+                     (float) 100.0);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_3, NurbsConsts.N_S_STEPS,
+                     (float) 100.0);
+    setnurbsproperty(GL2.GL_MAP2_VERTEX_4, NurbsConsts.N_S_STEPS,
+                     (float) 100.0);
+
+    setnurbsproperty(GL2.GL_MAP1_VERTEX_3, NurbsConsts.N_SAMPLINGMETHOD,
+                     NurbsConsts.N_PATHLENGTH);
+
+    set_domain_distance_u_rate(100.0);
+    set_domain_distance_v_rate(100.0);
+    set_is_domain_distance_sampling(0);
+
+    this.autoloadmode = true;
+
+    this.callBackFlag = 0;
+
+    this.errorCallback = null;
+  }
+
+  /**
+   * Sets domain distance for dom.dist. sampling in u direction
+   * 
+   * @param d
+   *            distance
+   */
+  private void set_domain_distance_u_rate(double d) {
+    // DONE
+    subdivider.set_domain_distance_u_rate(d);
+  }
+
+  /**
+   * Sets domain distance for dom.dist. sampling in v direction
+   * 
+   * @param d
+   *            distance
+   */
+  private void set_domain_distance_v_rate(double d) {
+    // DONE
+    subdivider.set_domain_distance_v_rate(d);
+  }
+
+  /**
+   * Begins new NURBS curve
+   */
+  public void bgncurve() {
+    // DONE
+    O_curve o_curve = new O_curve();
+    thread("do_bgncurve", o_curve);
+  }
+
+  /**
+   * Calls a method with given name and passes argumet
+   * 
+   * @param name
+   *            name of a method to be called
+   * @param arg
+   *            parameter to be passed to called method
+   */
+  private void thread(String name, Object arg) {
+    // DONE
+    Class partype[] = new Class[1];
+    partype[0] = arg.getClass();
+    Method m;
+    try {
+      m = this.getClass().getMethod(name, partype);
+      if (dl != null) {
+        dl.append(this, m, arg);
+      } else {
+        m.invoke(this, new Object[] { arg });
+      }
+    } catch (Throwable e) {
+      e.printStackTrace();
+    }
+
+  }
+
+  /**
+   * Calls a method with given name
+   * 
+   * @param name
+   *            name of a method to be called
+   */
+  private void thread2(String name) {
+    // DONE
+    try {
+      Method m = this.getClass().getMethod(name, (Class[]) null);
+      if (dl != null) {
+        dl.append(this, m, null);
+      } else {
+        m.invoke(this, (Object[]) null);
+      }
+    } catch (Throwable e) {
+      e.printStackTrace();
+    }
+  }
+
+  /**
+   * Begins a NURBS curve
+   * 
+   * @param o_curve
+   *            curve object
+   */
+  public void do_bgncurve(O_curve o_curve) {
+    if (inCurve > 0) {
+      do_nurbserror(6);
+      endcurve();
+    }
+    inCurve = 1;
+    currentCurve = o_curve;
+
+    currentCurve.curvetype = CT_NONE;
+
+    if (inTrim) {
+      if (!nextCurve.equals(o_curve)) {
+        isCurveModified = 1;
+        nextCurve = o_curve;
+      }
+    } else {
+      if (!playBack)
+        bgnrender();
+      isDataValid = 1;
+    }
+    nextCurve = o_curve.next;
+    // kind of solution of union
+    nextPwlcurve = o_curve.o_pwlcurve;
+    nextNurbscurve = o_curve.o_nurbscurve;
+  }
+
+  /**
+   * Begins new surface
+   * 
+   * @param o_surface
+   *            surface object
+   */
+  public void do_bgnsurface(O_surface o_surface) {
+    // DONE
+    if (inSurface > 0) {
+      do_nurbserror(27);
+      endsurface();
+    }
+    inSurface = 1;
+    if (!playBack)
+      bgnrender();
+
+    isTrimModified = false;
+    isDataSurfaceModified = false;
+    isDataValid = 1;
+    numTrims = 0;
+    currentSurface = o_surface;
+    nextTrim = o_surface.o_trim;
+    nextNurbssurface = o_surface.o_nurbssurface;
+  }
+
+  /**
+   * End a curve
+   */
+  public void endcurve() {
+    // DONE
+    thread2("do_endcurve");
+  }
+
+  /**
+   * Ends surface
+   */
+  public void do_endsurface() {
+    // DONE
+    if (inTrim) {
+      do_nurbserror(12);
+      endtrim();
+    }
+
+    if (inSurface <= 0) {
+      do_nurbserror(13);
+      return;
+    }
+
+    inSurface = 0;
+
+    nextNurbssurface = null;
+
+    if (isDataValid <= 0) {
+      return;
+    }
+
+    if (nextTrim != null) {
+      isTrimModified = true;
+      nextTrim = null;
+    }
+
+    // TODO errval ??
+    if (numTrims > 0) {
+      //				System.out.println("TODO glunurbs.do_endsurface - numtrims > 0");
+    }
+
+    subdivider.beginQuilts(new GL2Backend());
+    for (O_nurbssurface n = currentSurface.o_nurbssurface; n != null; n = n.next) {
+      subdivider.addQuilt(n.bezier_patches);
+    }
+    subdivider.endQuilts();
+    subdivider.drawSurfaces();
+    if (!playBack)
+      endrender();
+
+  }
+
+  /**
+   * Ends a curve
+   */
+  public void do_endcurve() {
+    // DONE
+    //			// System.out.println("do_endcurve");
+    if (inCurve <= 0) {
+      do_nurbserror(7);
+      return;
+    }
+    inCurve = 0;
+
+    nextCurve = null;
+
+    if (currentCurve.curvetype == CT_NURBSCURVE) {
+      // nextNurbscurve = null;
+      // currentCurve.o_nurbscurve=null;
+    } else {
+      // nextPwlcurve = null;
+      // currentCurve.o_pwlcurve=null;
+    }
+    if (!inTrim) {
+      if (isDataValid <= 0) {
+        return;
+      }
+      // TODO errval?
+      if (currentCurve.curvetype == CT_NURBSCURVE) {
+        subdivider.beginQuilts(new GL2Backend());
+
+        for (O_nurbscurve n = currentCurve.o_nurbscurve; n != null; n = n.next)
+          subdivider.addQuilt(n.bezier_curves);
+
+        subdivider.endQuilts();
+        subdivider.drawCurves();
+        if (!playBack)
+          endrender();
+      } else {
+        if (!playBack)
+          endrender();
+        do_nurbserror(9);
+      }
+    }
+
+  }
+
+  /**
+   * Method for handling error codes
+   * 
+   * @param i
+   *            error code
+   */
+  private void do_nurbserror(int i) {
+    // TODO nurberror
+    //			System.out.println("TODO nurbserror " + i);
+  }
+
+  /**
+   * Begin rendering
+   */
+  private void bgnrender() {
+    // DONE
+    if (autoloadmode) {
+      loadGLMatrices();
+    }
+  }
+
+  /**
+   * Load matrices from OpenGL state machine
+   */
+  private void loadGLMatrices() {
+    // TODO Auto-generated method stub
+    //			System.out.println("TODO glunurbs.loadGLMatrices");
+  }
+
+  /**
+   * End rendering
+   */
+  private void endrender() {
+    // DONE
+  }
+
+  /**
+   * Make a NURBS curve
+   * 
+   * @param nknots
+   *            number of knots in knot vector
+   * @param knot
+   *            knot vector
+   * @param stride
+   *            number of control points coordinates
+   * @param ctlarray
+   *            control points
+   * @param order
+   *            order of the curve
+   * @param realType
+   *            type of the curve
+   */
+  public void nurbscurve(int nknots, float[] knot, int stride,
+                         float[] ctlarray, int order, int realType) {
+    // DONE
+    Mapdesc mapdesc = maplist.locate(realType);
+    if (mapdesc == null) {
+      do_nurbserror(35);
+      isDataValid = 0;
+      return;
+    }
+    if (ctlarray == null) {
+      do_nurbserror(36);
+      isDataValid = 0;
+      return;
+    }
+    if (stride < 0) {
+      do_nurbserror(34);
+      isDataValid = 0;
+      return;
+    }
+    Knotvector knots = new Knotvector(nknots, stride, order, knot);
+
+    if (!do_check_knots(knots, "curve"))
+      return;
+
+    O_nurbscurve o_nurbscurve = new O_nurbscurve(realType);
+    o_nurbscurve.bezier_curves = new Quilt(mapdesc);
+    CArrayOfFloats ctrlcarr = new CArrayOfFloats(ctlarray);
+    o_nurbscurve.bezier_curves.toBezier(knots, ctrlcarr, mapdesc
+                                        .getNCoords());
+    thread("do_nurbscurve", o_nurbscurve);
+  }
+
+  /**
+   * Check knot vector specification
+   * 
+   * @param knots
+   *            knot vector
+   * @param msg
+   *            error message
+   * @return knot vector is / is not valid
+   */
+  public boolean do_check_knots(Knotvector knots, String msg) {
+    // DONE
+    int status = knots.validate();
+    if (status > 0) {
+      do_nurbserror(status);
+      if (renderhints.errorchecking != NurbsConsts.N_NOMSG)
+        knots.show(msg);
+    }
+    return (status > 0) ? false : true;
+  }
+
+  /**
+   * Draw a curve
+   * 
+   * @param o_nurbscurve
+   *            NURBS curve object
+   */
+  public void do_nurbscurve(O_nurbscurve o_nurbscurve) {
+    // DONE
+
+    if (inCurve <= 0) {
+      bgncurve();
+      inCurve = 2;
+    }
+
+    if (o_nurbscurve.used) {
+      do_nurbserror(23);
+      isDataValid = 0;
+      return;
+    } else
+      o_nurbscurve.used = true;
+
+    if (currentCurve.curvetype == CT_NONE) {
+      currentCurve.curvetype = CT_NURBSCURVE;
+    } else if (currentCurve.curvetype != CT_NURBSCURVE) {
+      do_nurbserror(24);
+      isDataValid = 0;
+      return;
+    }
+
+    // it was necessary to overcome problem with pointer to pointer here
+
+    // if(!o_nurbscurve.equals(nextNurbscurve)){
+    if (!o_nurbscurve.equals(currentCurve.o_nurbscurve)) {
+      isCurveModified = 1;
+      currentCurve.o_nurbscurve = o_nurbscurve;
+      // nextNurbscurve=o_nurbscurve;
+
+    }
+
+    nextNurbscurve = o_nurbscurve.next;
+
+    if (!currentCurve.equals(o_nurbscurve.owner)) {
+      isCurveModified = 1;
+      o_nurbscurve.owner = currentCurve;
+    }
+
+    if (o_nurbscurve.owner == null)
+      isCurveModified = 1;
+
+    if (inCurve == 2)
+      endcurve();
+  }
+
+  /**
+   * Draw NURBS surface
+   * 
+   * @param o_nurbssurface
+   *            NURBS surface object
+   */
+  public void do_nurbssurface(O_nurbssurface o_nurbssurface) {
+    // DONE
+    if (inSurface <= 0) {
+      bgnsurface();
+      inSurface = 2;
+    }
+    if (o_nurbssurface.used) {
+      do_nurbserror(25);
+      isDataValid = 0;
+      return;
+    } else
+      o_nurbssurface.used = true;
+
+    if (!o_nurbssurface.equals(nextNurbscurve)) {
+      isSurfaceModified = true;
+      // nextNurbssurface=o_nurbssurface;
+      currentSurface.o_nurbssurface = o_nurbssurface;
+    }
+
+    if (!currentSurface.equals(o_nurbssurface.owner)) {
+      isSurfaceModified = true;
+      o_nurbssurface.owner = currentSurface;
+    }
+
+    nextNurbssurface = o_nurbssurface.next;
+
+    if (inSurface == 2)
+      endsurface();
+  }
+
+  /**
+   * (Re)Inicialize maps
+   */
+  public void redefineMaps() {
+    // DONE
+    maplist.initialize();
+  }
+
+  /**
+   * Define a map of given properties
+   * 
+   * @param type
+   *            map type
+   * @param rational
+   *            is rational
+   * @param ncoords
+   *            number of control point coordinates
+   */
+  public void defineMap(int type, int rational, int ncoords) {
+    // DONE
+    maplist.define(type, rational, ncoords);
+  }
+
+  /**
+   * Set NURBS property
+   * 
+   * @param type
+   *            property type
+   * @param tag
+   *            property tag
+   * @param value
+   *            property value
+   */
+  public void setnurbsproperty(int type, int tag, float value) {
+    // DONE
+    Mapdesc mapdesc = maplist.locate(type);
+    if (mapdesc == null) {
+      do_nurbserror(35);
+      return;
+    }
+    if (!mapdesc.isProperty(tag)) {
+      do_nurbserror(26);
+      return;
+    }
+    Property prop = new Property(type, tag, value);
+    thread("do_setnurbsproperty2", prop);
+  }
+
+  /**
+   * Set parameters of existing property
+   * 
+   * @param prop
+   *            property
+   */
+  public void do_setnurbsproperty2(Property prop) {
+    Mapdesc mapdesc = maplist.find(prop.type);
+    mapdesc.setProperty(prop.tag, prop.value);
+  }
+
+  /**
+   * Set given property to rendering hints
+   * 
+   * @param prop
+   *            property to be set
+   */
+  public void do_setnurbsproperty(Property prop) {
+    // DONE
+    renderhints.setProperty(prop);
+    // TODO freeproperty?
+  }
+
+  /**
+   * Sets wheteher we use domain distance sampling
+   * 
+   * @param i
+   *            domain distance sampling flag
+   */
+  public void set_is_domain_distance_sampling(int i) {
+    // DONE
+    subdivider.set_is_domain_distance_sampling(i);
+  }
+
+  /**
+   * Begin new surface
+   */
+  public void bgnsurface() {
+    // DONE
+    O_surface o_surface = new O_surface();
+    // TODO nuid
+    //			System.out.println("TODO glunurbs.bgnsurface nuid");
+    thread("do_bgnsurface", o_surface);
+  }
+
+  /**
+   * End current surface
+   */
+  public void endsurface() {
+    // DONE
+    thread2("do_endsurface");
+  }
+
+  /**
+   * End surface trimming
+   */
+  private void endtrim() {
+    // TODO Auto-generated method stub
+    //			System.out.println("TODO glunurbs.endtrim");
+  }
+
+  /**
+   * Make NURBS surface
+   * 
+   * @param sknot_count
+   *            number of knots in s direction
+   * @param sknot
+   *            knot vector in s direction
+   * @param tknot_count
+   *            number of knots in t direction
+   * @param tknot
+   *            knot vector in t direction
+   * @param s_stride
+   *            number of coords of control points in s direction
+   * @param t_stride
+   *            number of coords of control points in t direction
+   * @param ctlarray
+   *            control points
+   * @param sorder
+   *            order of curve in s direction
+   * @param torder
+   *            order of curve in t direction
+   * @param type
+   *            NURBS surface type (rational,...)
+   */
+  public void nurbssurface(int sknot_count, float[] sknot, int tknot_count,
+                           float[] tknot, int s_stride, int t_stride, float[] ctlarray,
+                           int sorder, int torder, int type) {
+    // DONE
+    Mapdesc mapdesc = maplist.locate(type);
+    if (mapdesc == null) {
+      do_nurbserror(35);
+      isDataValid = 0;
+      return;
+    }
+    if (s_stride < 0 || t_stride < 0) {
+      do_nurbserror(34);
+      isDataValid = 0;
+      return;
+    }
+    Knotvector sknotvector = new Knotvector(sknot_count, s_stride, sorder,
+                                            sknot);
+    if (!do_check_knots(sknotvector, "surface"))
+      return;
+    Knotvector tknotvector = new Knotvector(tknot_count, t_stride, torder,
+                                            tknot);
+    if (!do_check_knots(tknotvector, "surface"))
+      return;
+
+    O_nurbssurface o_nurbssurface = new O_nurbssurface(type);
+    o_nurbssurface.bezier_patches = new Quilt(mapdesc);
+
+    CArrayOfFloats ctrlarr = new CArrayOfFloats(ctlarray);
+    o_nurbssurface.bezier_patches.toBezier(sknotvector, tknotvector,
+                                           ctrlarr, mapdesc.getNCoords());
+    thread("do_nurbssurface", o_nurbssurface);
+  }
+}