Initial incomplete GLU NURBS port under net.java.games.jogl.impl.nurbs

and a small README about the procedures being used during the port


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@180 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 147 insertions, 0 deletions

diff --git a/src/net/java/games/jogl/impl/nurbs/internals/Bin.java b/src/net/java/games/jogl/impl/nurbs/internals/Bin.java
new file mode 100755
index 000000000..55bec5eae
--- /dev/null
+++ b/src/net/java/games/jogl/impl/nurbs/internals/Bin.java
@@ -0,0 +1,147 @@
+/*
+** 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 1.1 (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.
+*/
+
+public class Bin {
+  private Arc head;    /*first arc on list */
+  private Arc current; /* current arc on list */
+
+  /**
+   * Sets current arc to first arc of bin; advances to next arc.
+   */
+  public Arc firstarc( ) {
+    current = head;
+    return nextarc( );
+  }
+  /**
+   * Returns current arc in bin and advances pointer to next arc.
+   */
+  public Arc nextarc( ) {
+    Arc jarc = current;
+
+    assert( (jarc == null) || jarc.check() );
+
+    if( jarc != null ) current = jarc.link;
+    return jarc;
+  }
+  /**
+   * Removes first Arc from bin.
+   */
+  public Arc removearc( ) {
+    Arc jarc = head;
+
+    if( jarc != null ) head = jarc.link;
+    return jarc;
+  }
+  public boolean isnonempty( ) { return (head != null); }
+  /**
+   * Adds an Arc to head of the linked list of Arcs.
+   */
+  public void addarc( Arc jarc ) {
+    jarc.link = head;
+    head = jarc;
+  }
+  /**
+   * Removes given Arc from bin.
+   */
+  public void  remove_this_arc( Arc arc ) {
+    Arc j, prev;
+    for( j = head; (j != null) && (j != arc); prev = j, j = j.link );
+
+    if( j != null ) {
+      if( j == current )
+        current = j.link;
+      if ( prev != null )
+        prev.link = j.link;
+    }
+  }
+  /**
+   * Counts number of arcs in bin.
+   */
+  public int numarcs( ) {
+    long count = 0;
+    for( Arc jarc = firstarc(); jarc != null; jarc = nextarc() )
+	count++;
+    return count;
+  }
+  /**
+   * Places an orphaned arc into its new parent's bin.
+   */
+  public void adopt( ) {
+    markall();
+
+    Arc orphan;
+    while( (orphan = removearc()) != null ) {
+      for( Arc parent = orphan.next; parent != orphan; parent = parent.next ) {
+        if (! parent.ismarked() ) {
+          orphan.link = parent.link;
+          parent.link = orphan;
+          orphan.clearmark();
+          break;
+        }
+      }
+    }
+  }
+  /**
+   * Marks all arcs with an identifying tag.
+   */
+  public void markall( ) {
+    for( Arc jarc = firstarc(); jarc != null; jarc = nextarc() )
+      jarc.setmark();
+  }
+  /**
+   * Prints out descriptions of the arcs in the bin.
+   */
+  public void show( String name ) {
+    System.out.println( name );
+    for( Arc jarc = firstarc(); jarc != null; jarc = nextarc() )
+        jarc.show( );
+  }
+  /**
+   * Prints out all arcs that are untessellated border arcs.
+   */
+  public void listBezier( ) {
+    for( Arc jarc = firstarc(); jarc != null; jarc = nextarc() ) {
+      if( jarc.isbezier( ) ) {
+        assert( jarc.pwlArc.npts == 2 );	
+        TrimVertex[] pts = jarc.pwlArc.pts;
+        float s1 = pts[0].param[0];
+        float t1 = pts[0].param[1];
+        float s2 = pts[1].param[0];
+        float t2 = pts[1].param[1];
+        System.out.println( "arc ( " + s1 + "," + t1 + ") (" +
+                            s2 + "," + t2 + ")");
+      }
+    }
+  }
+}