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/*
* Copyright (c) 2008 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 com.jogamp.opengl.util;
import com.jogamp.gluegen.runtime.Buffers;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GL2ES2;
import java.nio.*;
/**
* Utility routines for dealing with direct buffers.
* @author Kenneth Russel
* @author Michael Bien
*/
public class BufferUtil extends Buffers {
public static final int sizeOfGLType(int glType) {
switch (glType) {
case GL.GL_UNSIGNED_BYTE:
return SIZEOF_BYTE;
case GL.GL_BYTE:
return SIZEOF_BYTE;
case GL.GL_UNSIGNED_SHORT:
return SIZEOF_SHORT;
case GL.GL_SHORT:
return SIZEOF_SHORT;
case GL.GL_FLOAT:
return SIZEOF_FLOAT;
case GL.GL_FIXED:
return SIZEOF_INT;
case GL2ES2.GL_INT:
return SIZEOF_INT;
case GL2ES2.GL_UNSIGNED_INT:
return SIZEOF_INT;
case GL2.GL_DOUBLE:
return SIZEOF_DOUBLE;
}
return -1;
}
public static final int sizeOfBufferElem(Buffer buffer) {
if (buffer == null) {
return 0;
}
if (buffer instanceof ByteBuffer) {
return BufferUtil.SIZEOF_BYTE;
} else if (buffer instanceof IntBuffer) {
return BufferUtil.SIZEOF_INT;
} else if (buffer instanceof ShortBuffer) {
return BufferUtil.SIZEOF_SHORT;
} else if (buffer instanceof FloatBuffer) {
return BufferUtil.SIZEOF_FLOAT;
} else if (buffer instanceof DoubleBuffer) {
return BufferUtil.SIZEOF_DOUBLE;
}
throw new RuntimeException("Unexpected buffer type "
+ buffer.getClass().getName());
}
public static final Buffer newDirectGLBuffer(int glType, int numElements) {
switch (glType) {
case GL.GL_UNSIGNED_BYTE:
case GL.GL_BYTE:
return newDirectByteBuffer(numElements);
case GL.GL_UNSIGNED_SHORT:
case GL.GL_SHORT:
return newDirectShortBuffer(numElements);
case GL.GL_FLOAT:
return newDirectFloatBuffer(numElements);
case GL.GL_FIXED:
case GL2ES2.GL_INT:
case GL2ES2.GL_UNSIGNED_INT:
return newDirectIntBuffer(numElements);
case GL2.GL_DOUBLE:
return newDirectDoubleBuffer(numElements);
}
return null;
}
public static final Buffer sliceGLBuffer(ByteBuffer parent, int bytePos, int byteLen, int glType) {
if (parent == null || byteLen == 0) {
return null;
}
parent.position(bytePos);
parent.limit(bytePos + byteLen);
switch (glType) {
case GL.GL_UNSIGNED_BYTE:
case GL.GL_BYTE:
return parent.slice();
case GL.GL_UNSIGNED_SHORT:
case GL.GL_SHORT:
return parent.asShortBuffer();
case GL.GL_FLOAT:
return parent.asFloatBuffer();
case GL.GL_FIXED:
case GL2ES2.GL_INT:
case GL2ES2.GL_UNSIGNED_INT:
return parent.asIntBuffer();
case GL2.GL_DOUBLE:
return parent.asDoubleBuffer();
}
return null;
}
//----------------------------------------------------------------------
// Conversion routines
//
public final 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;
}
}
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