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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.mipmap;
import java.nio.ByteBuffer;
/**
*
* @author Administrator
*/
public class Extract1555rev implements Extract {
/** Creates a new instance of Extract1555rev */
public Extract1555rev() {
}
public void extract( boolean isSwap, ByteBuffer packedPixel, float[] extractComponents ) {
int ushort = 0;
if( isSwap ) {
ushort = 0x0000FFFF & Mipmap.GLU_SWAP_2_BYTES( packedPixel.getShort() );
} else {
ushort = 0x0000FFFF & packedPixel.getShort();
}
// 00000000,00011111 == 0x001F
// 00000011,11100000 == 0x03E0
// 01111100,00000000 == 0x7C00
// 10000000,00000000 == 0x8000
extractComponents[0] = (float)( ( ushort & 0x001F ) ) / 31.0f;
extractComponents[1] = (float)( ( ushort & 0x003E ) >> 5 ) / 31.0f;
extractComponents[2] = (float)( ( ushort & 0x7C00 ) >> 10) / 31.0f;
extractComponents[3] = (float)( ( ushort & 0x8000 ) >> 15);
}
public void shove( float[] shoveComponents, int index, ByteBuffer packedPixel ) {
// 00000000,00011111 == 0x001F
// 00000011,11100000 == 0x03E0
// 01111100,00000000 == 0x7C00
// 10000000,00000000 == 0x8000
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 );
assert( 0.0f <= shoveComponents[3] && shoveComponents[3] <= 1.0f );
// due to limited precision, need to round before shoving
int ushort = (((int)((shoveComponents[0] * 31) + 0.5f) ) & 0x0000001F );
ushort |= (((int)((shoveComponents[1] * 31) + 0.5f) << 5) & 0x000003E0 );
ushort |= (((int)((shoveComponents[2] * 31) + 0.5f) << 10) & 0x00007C00 );
ushort |= (((int)((shoveComponents[3]) + 0.5f) << 15) & 0x00008000 );
packedPixel.asShortBuffer().put( index, (short)ushort );
}
}
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