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/*
* 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);
}
}
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