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/*
* Copyright (c) 2003 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.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package net.java.games.jogl.util;
import java.nio.*;
import java.util.*;
/** Utility routines for dealing with direct buffers. */
public class BufferUtils {
public static final int SIZEOF_DOUBLE = 8;
public static final int SIZEOF_FLOAT = 4;
public static final int SIZEOF_INT = 4;
public static DoubleBuffer newDoubleBuffer(int numElements) {
ByteBuffer bb = newByteBuffer(numElements * SIZEOF_DOUBLE);
return bb.asDoubleBuffer();
}
public static FloatBuffer newFloatBuffer(int numElements) {
ByteBuffer bb = newByteBuffer(numElements * SIZEOF_FLOAT);
return bb.asFloatBuffer();
}
public static IntBuffer newIntBuffer(int numElements) {
ByteBuffer bb = newByteBuffer(numElements * SIZEOF_INT);
return bb.asIntBuffer();
}
public static ByteBuffer newByteBuffer(int numElements) {
ByteBuffer bb = ByteBuffer.allocateDirect(numElements);
bb.order(ByteOrder.nativeOrder());
return bb;
}
public static DoubleBuffer copyDoubleBuffer(DoubleBuffer orig) {
DoubleBuffer dest = newDoubleBuffer(orig.capacity());
orig.rewind();
dest.put(orig);
return dest;
}
public static FloatBuffer copyFloatBuffer(FloatBuffer orig) {
FloatBuffer dest = newFloatBuffer(orig.capacity());
orig.rewind();
dest.put(orig);
return dest;
}
public static IntBuffer copyIntBuffer(IntBuffer orig) {
IntBuffer dest = newIntBuffer(orig.capacity());
orig.rewind();
dest.put(orig);
return dest;
}
public static ByteBuffer copyByteBuffer(ByteBuffer orig) {
ByteBuffer dest = newByteBuffer(orig.capacity());
orig.rewind();
dest.put(orig);
return dest;
}
private static Map bufferOffsetCache = Collections.synchronizedMap(new HashMap());
/** Creates an "offset buffer" for use with the
ARB_vertex_buffer_object extension. The resulting Buffers are
suitable for use with routines such as glVertexPointer <em>when
used in conjunction with that extension</em>. They have no
capacity and are not suitable for passing to OpenGL routines
that do not support buffer offsets, or to non-OpenGL
routines. */
public static ByteBuffer bufferOffset(int offset) {
Integer key = new Integer(offset);
ByteBuffer buf = (ByteBuffer) bufferOffsetCache.get(key);
if (buf == null) {
buf = bufferOffset0(offset);
bufferOffsetCache.put(key, buf);
}
return buf;
}
private static native ByteBuffer bufferOffset0(int offset);
}
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