1 files changed, 97 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/impl/mipmap/Extract2101010rev.java b/src/classes/com/sun/opengl/impl/mipmap/Extract2101010rev.java
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+++ b/src/classes/com/sun/opengl/impl/mipmap/Extract2101010rev.java
@@ -0,0 +1,97 @@
+/*
+ * 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 Extract2101010rev implements Extract {
+  
+  /** Creates a new instance of Extract2101010 */
+  public Extract2101010rev() {
+  }
+  
+  public void extract( boolean isSwap, ByteBuffer packedPixel, float[] extractComponents ) {
+    long uint = 0;
+    
+    if( isSwap ) {
+      uint = 0x00000000FFFFFFFF & Mipmap.GLU_SWAP_4_BYTES( packedPixel.getInt() );
+    } else {
+      uint = 0x00000000FFFFFFFF & packedPixel.getInt();
+    }
+    
+    // 11111111,11000000,00000000,00000000 == 0xFFC00000
+    // 00000000,00111111,11110000,00000000 == 0x003F0000
+    // 00000000,00000000,00001111,11111100 == 0x00000FFC
+    // 00000000,00000000,00000000,00000011 == 0x00000003
+    
+    extractComponents[0] = (float)( ( uint & 0x000003FF )       ) / 1023.0f;
+    extractComponents[1] = (float)( ( uint & 0x000FFC00 ) >> 10 ) / 1023.0f;
+    extractComponents[2] = (float)( ( uint & 0x3FF00000 ) >> 20 ) / 1023.0f;
+    extractComponents[3] = (float)( ( uint & 0xC0000000 ) >> 30 ) / 3.0f;
+  }
+  
+  public void shove( float[] shoveComponents, int index, ByteBuffer packedPixel ) {
+    // 11110000,00000000 == 0xF000
+    // 00001111,00000000 == 0x0F00
+    // 00000000,11110000 == 0x00F0
+    // 00000000,00001111 == 0x000F
+    
+    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
+    long uint = (((int)((shoveComponents[0] * 1023) + 0.5f)    ) & 0x000003FF );
+    uint |= (((int)((shoveComponents[1] * 1023) + 0.5f) <<   10) & 0x000FFC00 );
+    uint |= (((int)((shoveComponents[2] * 1023) + 0.5f) <<   20) & 0x3FF00000 );
+    uint |= (((int)((shoveComponents[3] *    3) + 0.5f) <<   30) & 0xC0000000 );
+    packedPixel.asIntBuffer().put( index, (int)uint );
+  }
+}