Initial checkin of the Minimal Scene Graph (MSG) library, intentended

for experimentation with both 3D and 2D/3D interaction.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/joglutils/trunk@44 83d24430-9974-4f80-8418-2cc3294053b9

1 files changed, 155 insertions, 0 deletions

diff --git a/src/net/java/joglutils/msg/collections/Vec2fCollection.java b/src/net/java/joglutils/msg/collections/Vec2fCollection.java
new file mode 100644
index 0000000..a5ad3d3
--- /dev/null
+++ b/src/net/java/joglutils/msg/collections/Vec2fCollection.java
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ */
+
+package net.java.joglutils.msg.collections;
+
+import java.nio.*;
+
+import com.sun.opengl.util.*;
+
+import net.java.joglutils.msg.impl.*;
+import net.java.joglutils.msg.math.*;
+
+/** Provides the abstraction of a collection of Vec2f objects while
+    allowing access to the backing store in the form of a direct
+    FloatBuffer to make it easy to pass down to OpenGL. */
+
+public class Vec2fCollection {
+  // Data is stored as a direct FloatBuffer
+  private FloatBuffer data;
+
+  private static final int ELEMENT_SIZE = 2;
+
+  /** Creates an empty Vec2fCollection. */
+  public Vec2fCollection() {
+    // Assume you'll probably want at least four vertices
+    this(4);
+  }
+
+  /** Creates an empty Vec2fCollection with the backing store sized to
+      hold roughly the given number of vectors. */
+  public Vec2fCollection(int estimatedSize) {
+    data = BufferFactory.newFloatBuffer(ELEMENT_SIZE * estimatedSize);
+    data.limit(0);
+  }
+
+  /** Returns the number of Vec2fs currently in this collection. */
+  public int size() {
+    return data.limit() / ELEMENT_SIZE;
+  }
+
+  /** Stores the given Vec2f at the given index. If the collection has
+      not grown to the given size, throws an exception. */
+  public void set(int index, Vec2f value) throws IndexOutOfBoundsException {
+    if (index >= size()) {
+      throw new IndexOutOfBoundsException("" + index + " >= " + size());
+    }
+    int base = index * ELEMENT_SIZE;
+    FloatBuffer buf = data;
+    buf.put(base,     value.x());
+    buf.put(base + 1, value.y());
+  }
+
+  /** Fetches the Vec2f at the given index. If the collection has not
+      grown to the given size, throws an exception. */
+  public Vec2f get(int index) throws IndexOutOfBoundsException {
+    if (index >= size()) {
+      throw new IndexOutOfBoundsException("" + index + " >= " + size());
+    }
+    int base = index * ELEMENT_SIZE;
+    // Note: could use a small pool of Vec2fs here if allocation rate
+    // is an issue. However, escape analysis should eventually take
+    // care of this.
+    FloatBuffer buf = data;
+    return new Vec2f(buf.get(base), buf.get(base + 1));
+  }
+
+  /** Adds the given Vec2f to this collection, expanding it if
+      necessary. */
+  public void add(Vec2f value) {
+    FloatBuffer buf = data;
+    if (buf.limit() == buf.capacity()) {
+      FloatBuffer newBuf = BufferUtil.newFloatBuffer(Math.max(buf.capacity() + ELEMENT_SIZE,
+                                                              round((int) (buf.capacity() * 1.5f))));
+      newBuf.put(buf);
+      newBuf.limit(buf.limit());
+      data = newBuf;
+      buf = newBuf;
+    }
+    int pos = buf.limit();
+    buf.limit(pos + ELEMENT_SIZE);
+    buf.put(pos,     value.x());
+    buf.put(pos + 1, value.y());
+  }
+
+  /** Removes the given Vec2f from this collection. Moves all Vec2fs
+      above it down one slot. */
+  public Vec2f remove(int index) throws IndexOutOfBoundsException {
+    if (index >= size()) {
+      throw new IndexOutOfBoundsException("" + index + " >= " + size());
+    }
+    FloatBuffer buf = data;
+    int pos = index * ELEMENT_SIZE;
+    Vec2f res = new Vec2f(buf.get(pos), buf.get(pos + 1));
+    if (index == size() - 1) {
+      // Simply lower the limit
+      buf.limit(buf.limit() - ELEMENT_SIZE);
+    } else {
+      buf.position(pos + 1);
+      FloatBuffer rest = buf.slice();
+      buf.position(pos);
+      buf.put(rest);
+      buf.limit(buf.limit() - ELEMENT_SIZE);
+    }
+    return res;
+  }
+  
+  /** Returns the backing buffer of this collection. */
+  public FloatBuffer getData() {
+    FloatBuffer buf = data;
+    buf.position(0);
+    return buf.slice();
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private static int round(int size) {
+    return size - (size % ELEMENT_SIZE);
+  }
+}