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/*
* Copyright (c) 2009-2010 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions 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 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.scene.mesh;
import com.jme3.util.BufferUtils;
import java.nio.Buffer;
/**
* <code>IndexBuffer</code> is an abstraction for integer index buffers,
* it is used to retrieve indices without knowing in which format they
* are stored (ushort or uint).
*
* @author lex
*/
public abstract class IndexBuffer {
/**
* Creates an index buffer that can contain the given amount
* of vertices.
* Returns {@link IndexShortBuffer}
*
* @param vertexCount The amount of vertices to contain
* @param indexCount The amount of indices
* to contain.
* @return A new index buffer
*/
public static IndexBuffer createIndexBuffer(int vertexCount, int indexCount){
if (vertexCount > 65535){
return new IndexIntBuffer(BufferUtils.createIntBuffer(indexCount));
}else{
return new IndexShortBuffer(BufferUtils.createShortBuffer(indexCount));
}
}
/**
* Returns the vertex index for the given index in the index buffer.
*
* @param i The index inside the index buffer
* @return
*/
public abstract int get(int i);
/**
* Puts the vertex index at the index buffer's index.
* Implementations may throw an {@link UnsupportedOperationException}
* if modifying the IndexBuffer is not supported (e.g. virtual index
* buffers).
*/
public abstract void put(int i, int value);
/**
* Returns the size of the index buffer.
*
* @return the size of the index buffer.
*/
public abstract int size();
/**
* Returns the underlying data-type specific {@link Buffer}.
* Implementations may return null if there's no underlying
* buffer.
*
* @return the underlying {@link Buffer}.
*/
public abstract Buffer getBuffer();
}
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