1 files changed, 87 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/impl/mipmap/Extract5551.java b/src/classes/com/sun/opengl/impl/mipmap/Extract5551.java
new file mode 100644
index 000000000..047298152
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+++ b/src/classes/com/sun/opengl/impl/mipmap/Extract5551.java
@@ -0,0 +1,87 @@
+/*
+ * 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.
+ * 
+ * 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.*;
+
+/**
+ *
+ * @author Administrator
+ */
+public class Extract5551 implements Extract {
+  
+  /** Creates a new instance of Extract5551 */
+  public Extract5551() {
+  }
+  
+  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();
+    }
+    
+    // 11111000,00000000 == 0xF800
+    // 00000111,11000000 == 0x07C0
+    // 00000000,00111110 == 0x003E
+    // 00000000,00000001 == 0x0001
+    
+    extractComponents[0] = (float)( ( ushort & 0xF800 ) >> 11 ) / 31.0f;
+    extractComponents[1] = (float)( ( ushort & 0x00F0 ) >>  6 ) / 31.0f;
+    extractComponents[2] = (float)( ( ushort & 0x0F00 ) >>  1 ) / 31.0f;
+    extractComponents[3] = (float)( ( ushort & 0xF000 )       );
+  }
+  
+  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
+    int ushort = (((int)((shoveComponents[0] * 31) + 0.5f) << 11) & 0x0000F800 );
+    ushort |= (((int)((shoveComponents[1] * 31) + 0.5f) <<  6) & 0x000007C0 );
+    ushort |= (((int)((shoveComponents[2] * 31) + 0.5f) <<  1) & 0x0000003E );
+    ushort |= (((int)((shoveComponents[3]) + 0.5f)) & 0x00000001 );
+    packedPixel.asShortBuffer().put( index, (short)ushort );
+  }
+}