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/*
* License Applicability. Except to the extent portions of this file are
* made subject to an alternative license as permitted in the SGI Free
* Software License B, Version 1.1 (the "License"), the contents of this
* file are subject only to the provisions of the License. You may not use
* this file except in compliance with the License. You may obtain a copy
* of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
* Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
*
* http://oss.sgi.com/projects/FreeB
*
* Note that, as provided in the License, the Software is distributed on an
* "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
* DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
* CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
* PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
*
* NOTE: The Original Code (as defined below) has been licensed to Sun
* Microsystems, Inc. ("Sun") under the SGI Free Software License B
* (Version 1.1), shown above ("SGI License"). Pursuant to Section
* 3.2(3) of the SGI License, Sun is distributing the Covered Code to
* you under an alternative license ("Alternative License"). This
* Alternative License includes all of the provisions of the SGI License
* except that Section 2.2 and 11 are omitted. Any differences between
* the Alternative License and the SGI License are offered solely by Sun
* and not by SGI.
*
* Original Code. The Original Code is: OpenGL Sample Implementation,
* Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
* Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
* Copyright in any portions created by third parties is as indicated
* elsewhere herein. All Rights Reserved.
*
* Additional Notice Provisions: The application programming interfaces
* established by SGI in conjunction with the Original Code are The
* OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
* April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
* 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
* Window System(R) (Version 1.3), released October 19, 1998. This software
* was created using the OpenGL(R) version 1.2.1 Sample Implementation
* published by SGI, but has not been independently verified as being
* compliant with the OpenGL(R) version 1.2.1 Specification.
*/
package com.sun.opengl.impl.glu.mipmap;
import java.nio.ByteBuffer;
/**
*
* @author Administrator
*/
public class Extract233rev implements Extract {
/** Creates a new instance of Extract223rev */
public Extract233rev() {
}
public void extract( boolean isSwap, ByteBuffer packedPixel, float[] extractComponents ) {
// 11100000 == 0xe0
// 00011100 == 0x1c
// 00000011 == 0x03
byte ubyte = packedPixel.get();
extractComponents[0] = (float)((ubyte & 0x07) ) / 7.0f;
extractComponents[1] = (float)((ubyte & 0x38) >> 3) / 7.0f;
extractComponents[2] = (float)((ubyte & 0xC0) >> 6) / 3.0f;
}
public void shove( float[] shoveComponents, int index, ByteBuffer packedPixel ) {
// 11100000 == 0xE0
// 00011100 == 0x1C
// 00000011 == 0x03
assert( 0.0f <= shoveComponents[0] && shoveComponents[0] <= 1.0f );
assert( 0.0f <= shoveComponents[1] && shoveComponents[1] <= 1.0f );
assert( 0.0f <= shoveComponents[2] && shoveComponents[2] <= 1.0f );
// due to limited precision, need to round before shoving
byte b = (byte)( ( (int)( ( shoveComponents[0] * 7 ) + 0.5f ) ) & 0x07 );
b |= (byte)( ( (int)( ( shoveComponents[1] * 7 ) + 0.5f ) << 3 ) & 0x38 );
b |= (byte)( ( (int)( ( shoveComponents[2] * 3 ) + 0.5f ) << 6 ) & 0xC0 );
packedPixel.position( index );
packedPixel.put( b );
}
}
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