diff options
Diffstat (limited to 'src/net/java/joglutils/msg/collections/Vec2fCollection.java')
-rw-r--r-- | src/net/java/joglutils/msg/collections/Vec2fCollection.java | 155 |
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); + } +} |