1 files changed, 87 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/impl/mipmap/Extract1555rev.java b/src/classes/com/sun/opengl/impl/mipmap/Extract1555rev.java
new file mode 100644
index 000000000..1b8372e84
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+++ b/src/classes/com/sun/opengl/impl/mipmap/Extract1555rev.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.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 );
+  }
+}