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/*
* Copyright (c) 2009 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.
*
*/
package com.sun.opengl.impl;
import java.lang.reflect.*;
import java.nio.*;
/** Internal copy of selected routines from BufferUtil to avoid
outward dependencies on com.sun.opengl.util package. */
public class InternalBufferUtil {
public static final int SIZEOF_BYTE = 1;
public static final int SIZEOF_SHORT = 2;
public static final int SIZEOF_INT = 4;
public static final int SIZEOF_FLOAT = 4;
public static final int SIZEOF_LONG = 8;
public static final int SIZEOF_DOUBLE = 8;
//----------------------------------------------------------------------
// Allocation routines
//
/** Allocates a new direct ByteBuffer with the specified number of
elements. The returned buffer will have its byte order set to
the host platform's native byte order. */
public static ByteBuffer newByteBuffer(int numElements) {
ByteBuffer bb = ByteBuffer.allocateDirect(numElements);
nativeOrder(bb);
return bb;
}
/** Allocates a new direct DoubleBuffer with the specified number of
elements. The returned buffer will have its byte order set to
the host platform's native byte order. */
public static DoubleBuffer newDoubleBuffer(int numElements) {
ByteBuffer bb = newByteBuffer(numElements * SIZEOF_DOUBLE);
return bb.asDoubleBuffer();
}
/** Allocates a new direct IntBuffer with the specified number of
elements. The returned buffer will have its byte order set to
the host platform's native byte order. */
public static IntBuffer newIntBuffer(int numElements) {
ByteBuffer bb = newByteBuffer(numElements * SIZEOF_INT);
return bb.asIntBuffer();
}
/** Allocates a new direct FloatBuffer with the specified number of
elements. The returned buffer will have its byte order set to
the host platform's native byte order. */
public static FloatBuffer newFloatBuffer(int numElements) {
ByteBuffer bb = newByteBuffer(numElements * SIZEOF_FLOAT);
return bb.asFloatBuffer();
}
//----------------------------------------------------------------------
// Copy routines (type-to-type)
//
/** Copies the <i>remaining</i> elements (as defined by
<code>limit() - position()</code>) in the passed ByteBuffer into
a newly-allocated direct ByteBuffer. The returned buffer will
have its byte order set to the host platform's native byte
order. The position of the newly-allocated buffer will be zero,
and the position of the passed buffer is unchanged (though its
mark is changed). */
public static ByteBuffer copyByteBuffer(ByteBuffer orig) {
ByteBuffer dest = newByteBuffer(orig.remaining());
dest.put(orig);
dest.rewind();
return dest;
}
//----------------------------------------------------------------------
// Copy routines (type-to-ByteBuffer)
//
/** Copies the <i>remaining</i> elements (as defined by
<code>limit() - position()</code>) in the passed FloatBuffer
into a newly-allocated direct ByteBuffer. The returned buffer
will have its byte order set to the host platform's native byte
order. The position of the newly-allocated buffer will be zero,
and the position of the passed buffer is unchanged (though its
mark is changed). */
public static ByteBuffer copyFloatBufferAsByteBuffer(FloatBuffer orig) {
ByteBuffer dest = newByteBuffer(orig.remaining() * SIZEOF_FLOAT);
dest.asFloatBuffer().put(orig);
dest.rewind();
return dest;
}
/** Copies the <i>remaining</i> elements (as defined by
<code>limit() - position()</code>) in the passed IntBuffer into
a newly-allocated direct ByteBuffer. The returned buffer will
have its byte order set to the host platform's native byte
order. The position of the newly-allocated buffer will be zero,
and the position of the passed buffer is unchanged (though its
mark is changed). */
public static ByteBuffer copyIntBufferAsByteBuffer(IntBuffer orig) {
ByteBuffer dest = newByteBuffer(orig.remaining() * SIZEOF_INT);
dest.asIntBuffer().put(orig);
dest.rewind();
return dest;
}
/** Copies the <i>remaining</i> elements (as defined by
<code>limit() - position()</code>) in the passed ShortBuffer
into a newly-allocated direct ByteBuffer. The returned buffer
will have its byte order set to the host platform's native byte
order. The position of the newly-allocated buffer will be zero,
and the position of the passed buffer is unchanged (though its
mark is changed). */
public static ByteBuffer copyShortBufferAsByteBuffer(ShortBuffer orig) {
ByteBuffer dest = newByteBuffer(orig.remaining() * SIZEOF_SHORT);
dest.asShortBuffer().put(orig);
dest.rewind();
return dest;
}
//----------------------------------------------------------------------
// Conversion routines
//
public static float[] getFloatArray(double[] source) {
int i=source.length;
float[] dest = new float[i--];
while(i>=0) { dest[i]=(float)source[i]; i--; }
return dest;
}
public static ByteBuffer nativeOrder(ByteBuffer buf) {
if (!isCDCFP) {
try {
if (byteOrderClass == null) {
byteOrderClass = Class.forName("java.nio.ByteOrder");
orderMethod = ByteBuffer.class.getMethod("order", new Class[] { byteOrderClass });
Method nativeOrderMethod = byteOrderClass.getMethod("nativeOrder", null);
nativeOrderObject = nativeOrderMethod.invoke(null, null);
}
} catch (Throwable t) {
// Must be running on CDC / FP
isCDCFP = true;
}
if (!isCDCFP) {
try {
orderMethod.invoke(buf, new Object[] { nativeOrderObject });
} catch (Throwable t) {
}
}
}
return buf;
}
//----------------------------------------------------------------------
// Internals only below this point
//
// NOTE that this work must be done reflectively at the present time
// because this code must compile and run correctly on both CDC/FP and J2SE
private static boolean isCDCFP;
private static Class byteOrderClass;
private static Object nativeOrderObject;
private static Method orderMethod;
}
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