This commit was manufactured by cvs2svn to create branch 'JSR-231'.

git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/branches/JSR-231@244 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 1575 insertions, 0 deletions

diff --git a/src/net/java/games/jogl/impl/mipmap/BuildMipmap.java b/src/net/java/games/jogl/impl/mipmap/BuildMipmap.java
new file mode 100644
index 000000000..6a8a0b08d
--- /dev/null
+++ b/src/net/java/games/jogl/impl/mipmap/BuildMipmap.java
@@ -0,0 +1,1575 @@
+/*
+ * 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 net.java.games.jogl.impl.mipmap;
+
+import net.java.games.jogl.GL;
+import net.java.games.jogl.GLU;
+import net.java.games.jogl.impl.Debug;
+import java.nio.*;
+import java.io.*;
+
+/**
+ *
+ * @author  Administrator
+ */
+public class BuildMipmap {
+
+  private static boolean DEBUG = Debug.debug("BuildMipmap");
+
+  /** Creates a new instance of BuildMipmap */
+  public BuildMipmap() {
+  }
+  
+  public static int gluBuild1DMipmapLevelsCore( GL gl, int target, int internalFormat,
+                  int width, int widthPowerOf2, int format, int type, int userLevel,
+                  int baseLevel, int maxLevel, ByteBuffer data ) {
+    int newwidth;
+    int level, levels;
+    ShortBuffer newImage = null;
+    int newImage_width;
+    ShortBuffer otherImage = null;
+    ShortBuffer imageTemp = null;
+    int memreq;
+    int maxsize;
+    int cmpts;
+    PixelStorageModes psm = new PixelStorageModes();
+    
+    assert( Mipmap.checkMipmapArgs( internalFormat, format, type ) == 0 );
+    assert( width >= 1 );
+    
+    newwidth = widthPowerOf2;
+    levels = Mipmap.computeLog( newwidth );
+    
+    levels += userLevel;
+    
+    Mipmap.retrieveStoreModes( gl, psm );
+    try {
+      newImage = ByteBuffer.allocateDirect( Mipmap.image_size( width, 1, format, 
+            GL.GL_UNSIGNED_SHORT ) ).order( ByteOrder.nativeOrder() ).asShortBuffer();
+    } catch( OutOfMemoryError ome ) {
+      return( GLU.GLU_OUT_OF_MEMORY );
+    }
+    newImage_width = width;
+    
+    Image.fill_image( psm, width, 1, format, type, Mipmap.is_index( format ), data, newImage );
+    cmpts = Mipmap.elements_per_group( format, type );
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, 2 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, 0 );
+    
+    // if swap_bytes was set, swapping occurred in fill_image
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, GL.GL_FALSE );
+    
+    for( level = userLevel; level <= levels; level++ ) {
+      if( newImage_width == newwidth ) {
+        // user newimage for this level
+        if( baseLevel <= level && level <= maxLevel ) {
+          gl.glTexImage1D( target, level, internalFormat, newImage_width, 0, format,
+                        GL.GL_UNSIGNED_SHORT, newImage );
+        }
+      } else {
+        if( otherImage == null ) {
+          memreq = Mipmap.image_size( newwidth, 1, format, GL.GL_UNSIGNED_SHORT );
+          try {
+            otherImage = ByteBuffer.allocateDirect( memreq ).order( ByteOrder.nativeOrder() ).asShortBuffer();
+          } catch( OutOfMemoryError ome ) {
+            gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+            gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+            gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+            gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+            gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+            return( GLU.GLU_OUT_OF_MEMORY );
+          }
+        }
+        ScaleInternal.scale_internal( cmpts, newImage_width, 1, newImage, newwidth, 1, otherImage );
+        // swap newImage and otherImage
+        imageTemp = otherImage;
+        otherImage = newImage;
+        newImage = imageTemp;
+        
+        newImage_width = newwidth;
+        if( baseLevel <= level && level <= maxLevel ) {
+          gl.glTexImage1D( target, level, internalFormat, newImage_width, 0, 
+                            format, GL.GL_UNSIGNED_SHORT, newImage );
+        }
+      }
+      if( newwidth > 1 ) {
+        newwidth /= 2;
+      }
+    }
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+    
+    return( 0 );
+  }
+  
+  public static int bitmapBuild2DMipmaps( GL gl, int target, int internalFormat,
+            int width, int height, int format, int type, ByteBuffer data ) {
+    int newwidth[] = new int[1];
+    int newheight[] = new int[1];
+    int level, levels;
+    ShortBuffer newImage = null;
+    int newImage_width;
+    int newImage_height;
+    ShortBuffer otherImage = null;
+    ShortBuffer tempImage = null;
+    int memreq;
+    int maxsize;
+    int cmpts;
+    PixelStorageModes psm = new PixelStorageModes();
+    
+    Mipmap.retrieveStoreModes( gl, psm );
+    
+    Mipmap.closestFit( gl, target, width, height, internalFormat, format, type, newwidth, newheight );
+    
+    levels = Mipmap.computeLog( newwidth[0] );
+    level = Mipmap.computeLog( newheight[0] );
+    if( level > levels ) {
+      levels = level;
+    }
+    
+    try {
+      newImage = ByteBuffer.allocateDirect( Mipmap.image_size( width, height, 
+            format, GL.GL_UNSIGNED_SHORT ) ).order( ByteOrder.nativeOrder() ).asShortBuffer();
+    } catch( OutOfMemoryError ome ) {
+      return( GLU.GLU_OUT_OF_MEMORY );
+    }
+    newImage_width = width;
+    newImage_height = height;
+    
+    Image.fill_image( psm, width, height, format, type, Mipmap.is_index( format ), data, newImage );
+    
+    cmpts = Mipmap.elements_per_group( format, type );
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, 2 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, 0 );
+    
+    // if swap_bytes is set, swapping occurred in fill_image
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, GL.GL_FALSE );
+    
+    for( level = 0; level < levels; level++ ) {
+      if( newImage_width == newwidth[0] && newImage_height == newheight[0] ) {
+        gl.glTexImage2D( target, level, internalFormat, newImage_width,
+            newImage_height, 0, format, GL.GL_UNSIGNED_SHORT, newImage );
+      } else {
+        if( otherImage == null ) {
+          memreq = Mipmap.image_size( newwidth[0], newheight[0], format, GL.GL_UNSIGNED_SHORT );
+          try {
+            otherImage = ByteBuffer.allocateDirect( memreq ).order( ByteOrder.nativeOrder() ).asShortBuffer();
+          } catch( OutOfMemoryError ome ) {
+            gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+            gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+            gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+            gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+            gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+            return( GLU.GLU_OUT_OF_MEMORY );
+          }
+        }
+        ScaleInternal.scale_internal( cmpts, newImage_width, newImage_height, 
+                              newImage, newwidth[0], newheight[0], otherImage );
+        // swap newImage and otherImage
+        tempImage = otherImage;
+        otherImage = newImage;
+        newImage = tempImage;
+        
+        newImage_width = newwidth[0];
+        newImage_height = newheight[0];
+        gl.glTexImage2D( target, level, internalFormat, newImage_width, newImage_height,
+                                    0, format, GL.GL_UNSIGNED_SHORT, newImage );
+      }
+      if( newheight[0] > 1 ) {
+        newwidth[0] /= 2;
+      }
+      if( newheight[0] > 1 ) {
+        newheight[0] /= 2;
+      }
+    }
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+    
+    return( 0 );
+  }
+  
+  public static int gluBuild2DMipmapLevelsCore( GL gl, int target, int internalFormat,
+                int width, int height, int widthPowerOf2, int heightPowerOf2,
+                int format, int type, int userLevel, int baseLevel, int maxLevel,
+                ByteBuffer data ) { // PointerWrapper data
+    int newwidth;
+    int newheight;
+    int level, levels;
+    int usersImage;
+    ByteBuffer srcImage = null;
+    ByteBuffer dstImage = null;
+    ByteBuffer tempImage = null;
+    int newImage_width;
+    int newImage_height;
+    short[] SWAP_IMAGE = null;
+    int memreq;
+    int maxsize;
+    int cmpts;
+    
+    boolean myswap_bytes;
+    int groups_per_line, element_size, group_size;
+    int rowsize, padding;
+    PixelStorageModes psm = new PixelStorageModes();
+    
+    assert( Mipmap.checkMipmapArgs( internalFormat, format, type ) == 0 );
+    assert( width >= 1 && height >= 1 );
+    
+    if( type == GL.GL_BITMAP ) {
+      return( bitmapBuild2DMipmaps( gl, target, internalFormat, width, height, format, type, data ) );
+    }
+    
+    newwidth = widthPowerOf2;
+    newheight = heightPowerOf2;
+    levels = Mipmap.computeLog( newwidth );
+    level = Mipmap.computeLog( newheight );
+    if( level > levels ) {
+      levels = level;
+    }
+    
+    levels += userLevel;
+    
+    Mipmap.retrieveStoreModes( gl, psm );
+    myswap_bytes = psm.getUnpackSwapBytes();
+    cmpts = Mipmap.elements_per_group( format, type );
+    if( psm.getUnpackRowLength() > 0 ) {
+      groups_per_line = psm.getUnpackRowLength();
+    } else {
+      groups_per_line = width;
+    }
+    
+    element_size = Mipmap.bytes_per_element( type );
+    group_size = element_size * cmpts;
+    if( element_size == 1 ) {
+      myswap_bytes = false;
+    }
+    
+    rowsize = groups_per_line * group_size;
+    padding = ( rowsize % psm.getUnpackAlignment() );
+    if( padding != 0 ) {
+      rowsize += psm.getUnpackAlignment() - padding;
+    }
+    
+    data.position( psm.getUnpackSkipRows() * rowsize + psm.getUnpackSkipPixels() * group_size );
+    data.mark();
+    
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, 0 );
+    
+    level = userLevel;
+    
+    // already power of two square
+    if( width == newwidth && height == newheight ) {
+      // use usersImage for level userLevel
+      if( baseLevel <= level && level <= maxLevel ) {
+        gl.glTexImage2D( target, level, internalFormat, width, height, 0, format, type, data );
+      }
+      if( levels == 0 ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+      }
+      int nextWidth = newwidth / 2;
+      int nextHeight = newheight / 2;
+      
+      // clamp to 1
+      if( nextWidth < 1 ) {
+        nextWidth = 1;
+      }
+      if( nextHeight < 1 ) {
+        nextHeight = 1;
+      }
+      memreq = Mipmap.image_size( nextWidth, nextHeight, format, type );
+      
+      try {
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+          case( GL.GL_BYTE ):
+          case( GL.GL_UNSIGNED_SHORT ):
+          case( GL.GL_SHORT ):
+          case( GL.GL_UNSIGNED_INT ):
+          case( GL.GL_INT ):
+          case( GL.GL_FLOAT ):
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            dstImage = ByteBuffer.allocateDirect( memreq ).order( ByteOrder.nativeOrder() );
+            break;
+          default:
+            return( GLU.GLU_INVALID_ENUM );
+        }
+      } catch( OutOfMemoryError ome ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+        return( GLU.GLU_OUT_OF_MEMORY );
+      }
+      if( dstImage != null ) {
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+            HalveImage.halveImage_ubyte( cmpts, width, height, data, dstImage, element_size, rowsize, group_size );
+            break;
+          case( GL.GL_BYTE ):
+            HalveImage.halveImage_byte( cmpts, width, height, data, dstImage, element_size, rowsize, group_size );
+            break;
+          case( GL.GL_UNSIGNED_SHORT ):
+            HalveImage.halveImage_ushort( cmpts, width, height, data, dstImage.asShortBuffer(), element_size, rowsize, group_size, myswap_bytes );
+            break;
+          case( GL.GL_SHORT ):
+            HalveImage.halveImage_short( cmpts, width, height, data, dstImage.asShortBuffer(), element_size, rowsize, group_size, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_INT ):
+            HalveImage.halveImage_uint( cmpts, width, height, data, dstImage.asIntBuffer(), element_size, rowsize, group_size, myswap_bytes );
+            break;
+          case( GL.GL_INT ):
+            HalveImage.halveImage_int( cmpts, width, height, data, dstImage.asIntBuffer(), element_size, rowsize, group_size, myswap_bytes );
+            break;
+          case( GL.GL_FLOAT ):
+            HalveImage.halveImage_float( cmpts, width, height, data, dstImage.asFloatBuffer(), element_size, rowsize, group_size, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+            assert( format == GL.GL_RGB );
+            HalveImage.halveImagePackedPixel( 3, new Extract332(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+            assert( format == GL.GL_RGB );
+            HalveImage.halveImagePackedPixel( 3, new Extract233rev(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+            HalveImage.halveImagePackedPixel( 3, new Extract565(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+            HalveImage.halveImagePackedPixel( 3, new Extract565rev(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+            HalveImage.halveImagePackedPixel( 4, new Extract4444(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+            HalveImage.halveImagePackedPixel( 4, new Extract4444rev(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+            HalveImage.halveImagePackedPixel( 4, new Extract5551(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+            HalveImage.halveImagePackedPixel( 4, new Extract1555rev(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+            HalveImage.halveImagePackedPixel( 4, new Extract8888(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+            HalveImage.halveImagePackedPixel( 4, new Extract8888rev(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+            HalveImage.halveImagePackedPixel( 4, new Extract1010102(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            HalveImage.halveImagePackedPixel( 4, new Extract2101010rev(), width, height, data, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+          default:
+            assert( false );
+            break;
+        }
+      }
+      newwidth = width / 2;
+      newheight = height / 2;
+      // clamp to 1
+      if( newwidth < 1 ) {
+        newwidth = 1;
+      }
+      if( newheight < 1 ) {
+        newheight = 1;
+      }
+      
+      myswap_bytes = false;
+      rowsize = newwidth * group_size;
+      memreq = Mipmap.image_size( newwidth, newheight, format, type );
+      // swap srcImage and dstImage
+      tempImage = srcImage;
+      srcImage = dstImage;
+      dstImage = tempImage;
+      try {
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+          case( GL.GL_BYTE ):
+          case( GL.GL_UNSIGNED_SHORT ):
+          case( GL.GL_SHORT ):
+          case( GL.GL_UNSIGNED_INT ):
+          case( GL.GL_INT ):
+          case( GL.GL_FLOAT ):
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            dstImage = ByteBuffer.allocateDirect( memreq ).order( ByteOrder.nativeOrder() );
+            break;
+          default:
+            return( GLU.GLU_INVALID_ENUM );
+        }
+      } catch( OutOfMemoryError ome ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+        return( GLU.GLU_OUT_OF_MEMORY );
+      }
+      // level userLevel+1 is in srcImage; level userLevel already saved
+      level = userLevel + 1;
+    } else { // user's image is not nice powerof2 size square
+      memreq = Mipmap.image_size( newwidth, newheight, format, type );
+      try { 
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+          case( GL.GL_BYTE ):
+          case( GL.GL_UNSIGNED_SHORT ):
+          case( GL.GL_SHORT ):
+          case( GL.GL_UNSIGNED_INT ):
+          case( GL.GL_INT ):
+          case( GL.GL_FLOAT ):
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            dstImage = ByteBuffer.allocateDirect( memreq ).order( ByteOrder.nativeOrder() );
+            break;
+          default:
+            return( GLU.GLU_INVALID_ENUM );
+        }
+      } catch( OutOfMemoryError ome ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+        return( GLU.GLU_OUT_OF_MEMORY );
+      }
+      data.reset();
+      switch( type ) {
+        case( GL.GL_UNSIGNED_BYTE ):
+          ScaleInternal.scale_internal_ubyte( cmpts, width, height, data, 
+                newwidth, newheight, dstImage, element_size, rowsize, group_size );
+          break;
+        case( GL.GL_BYTE ):
+          ScaleInternal.scale_internal_byte( cmpts, width, height, data, newwidth, 
+                  newheight, dstImage, element_size, rowsize, group_size );
+          break;
+        case( GL.GL_UNSIGNED_SHORT ):
+          ScaleInternal.scale_internal_ushort( cmpts, width, height, data, newwidth, 
+                  newheight, dstImage.asShortBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_SHORT ):
+          ScaleInternal.scale_internal_ushort( cmpts, width, height, data, newwidth,
+                  newheight, dstImage.asShortBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_INT ):
+          ScaleInternal.scale_internal_uint( cmpts, width, height, data, newwidth,
+                  newheight, dstImage.asIntBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_INT ):
+          ScaleInternal.scale_internal_int( cmpts, width, height, data, newwidth,
+                  newheight, dstImage.asIntBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_FLOAT ):
+          ScaleInternal.scale_internal_float( cmpts, width, height, data, newwidth,
+                  newheight, dstImage.asFloatBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          ScaleInternal.scaleInternalPackedPixel( 3, new Extract332(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          ScaleInternal.scaleInternalPackedPixel( 3, new Extract233rev(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          ScaleInternal.scaleInternalPackedPixel( 3, new Extract565(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          ScaleInternal.scaleInternalPackedPixel( 3, new Extract565rev(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract4444(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract4444rev(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract5551(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract1555rev(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract8888(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract8888rev(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract1010102(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+          ScaleInternal.scaleInternalPackedPixel( 4, new Extract2101010rev(), width, height, data, newwidth,
+              newheight, dstImage, element_size, rowsize, myswap_bytes );
+          break;
+        default:
+          assert( false );
+          break;
+      }
+      myswap_bytes = false;
+      rowsize = newwidth * group_size;
+      // swap dstImage and srcImage
+      tempImage = srcImage;
+      srcImage = dstImage;
+      dstImage = tempImage;
+      
+      if( levels != 0 ) { // use as little memory as possible
+        int nextWidth = newwidth / 2;
+        int nextHeight = newheight / 2;
+        if( nextWidth < 1 ) {
+          nextWidth = 1;
+        }
+        if( nextHeight < 1 ) {
+          nextHeight = 1;
+        }
+        
+        memreq = Mipmap.image_size( nextWidth, nextHeight, format, type );
+        try {
+          switch( type ) {
+            case( GL.GL_UNSIGNED_BYTE ):
+            case( GL.GL_BYTE ):
+            case( GL.GL_UNSIGNED_SHORT ):
+            case( GL.GL_SHORT ):
+            case( GL.GL_UNSIGNED_INT ):
+            case( GL.GL_INT ):
+            case( GL.GL_FLOAT ):
+            case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+            case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+            case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+            case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+            case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+            case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+            case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+            case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+            case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+            case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+            case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+            case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+              dstImage = ByteBuffer.allocateDirect( memreq ).order( ByteOrder.nativeOrder() );
+              break;
+            default:
+              return( GLU.GLU_INVALID_ENUM );
+          }
+        } catch( OutOfMemoryError ome ) {
+          gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+          gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+          gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+          gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+          gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+          return( GLU.GLU_OUT_OF_MEMORY );
+        }
+      }
+      // level userLevel is in srcImage; nothing saved yet
+      level = userLevel;
+    }
+    
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, GL.GL_FALSE );
+    if( baseLevel <= level && level <= maxLevel ) {
+      srcImage.rewind();
+      if (DEBUG) {
+        System.err.println("GL Error(" + level + "): " + gl.glGetError() );
+      }
+      gl.glTexImage2D( target, level, internalFormat, newwidth, newheight, 0, format, type, srcImage );
+      if (DEBUG) {
+        System.err.println("GL Error(" + level + "): " + gl.glGetError() );
+        try {
+          File file = new File( "glu2DMipmapJ" + level + ".bin" );
+          FileOutputStream fos = new FileOutputStream( file );
+          srcImage.limit( Mipmap.image_size( newwidth, newheight, format, type ) );
+          fos.getChannel().write( srcImage );
+          srcImage.clear();
+          fos.close();
+        } catch( IOException e ) {
+          System.err.println("IOException");
+          System.err.println(e.getMessage());
+        }
+      }
+    }
+    
+    level++;  // update current level for the loop
+    for( ; level <= levels; level++ ) {
+      srcImage.rewind();
+      dstImage.rewind();
+      switch( type ) {
+        case( GL.GL_UNSIGNED_BYTE ):
+          HalveImage.halveImage_ubyte( cmpts, newwidth, newheight, srcImage, dstImage, element_size, rowsize, group_size );
+          break;
+        case( GL.GL_BYTE ):
+          HalveImage.halveImage_byte( cmpts, newwidth, newheight, srcImage, dstImage, element_size, rowsize, group_size );
+          break;
+        case( GL.GL_UNSIGNED_SHORT ):
+          HalveImage.halveImage_ushort( cmpts, newwidth, newheight, srcImage, dstImage.asShortBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_SHORT ):
+          HalveImage.halveImage_short( cmpts, newwidth, newheight, srcImage, dstImage.asShortBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_INT ):
+          HalveImage.halveImage_uint( cmpts, newwidth, newheight, srcImage, dstImage.asIntBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_INT ):
+          HalveImage.halveImage_int( cmpts, newwidth, newheight, srcImage, dstImage.asIntBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_FLOAT ):
+          HalveImage.halveImage_float( cmpts, newwidth, newheight, srcImage, dstImage.asFloatBuffer(), element_size, rowsize, group_size, myswap_bytes );
+          break;
+        case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          assert( format == GL.GL_RGB );
+          HalveImage.halveImagePackedPixel( 3, new Extract332(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          assert( format == GL.GL_RGB );
+          HalveImage.halveImagePackedPixel( 3, new Extract233rev(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          HalveImage.halveImagePackedPixel( 3, new Extract565(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          HalveImage.halveImagePackedPixel( 3, new Extract565rev(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          HalveImage.halveImagePackedPixel( 4, new Extract4444(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          HalveImage.halveImagePackedPixel( 4, new Extract4444rev(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          HalveImage.halveImagePackedPixel( 4, new Extract5551(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          HalveImage.halveImagePackedPixel( 4, new Extract1555rev(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          HalveImage.halveImagePackedPixel( 4, new Extract8888(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          HalveImage.halveImagePackedPixel( 4, new Extract8888rev(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          HalveImage.halveImagePackedPixel( 4, new Extract1010102(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+          HalveImage.halveImagePackedPixel( 4, new Extract2101010rev(), newwidth, newheight, srcImage, dstImage, element_size, rowsize, myswap_bytes );
+            break;
+        default:
+          assert( false );
+          break;
+      }
+      
+      // swap dstImage and srcImage
+      tempImage = srcImage;
+      srcImage = dstImage;
+      dstImage = tempImage;
+      
+      if( newwidth > 1 ) {
+        newwidth /= 2;
+        rowsize /= 2;
+      }
+      if( newheight > 1 ) {
+        newheight /= 2;
+      }
+      // compute amount to pad per row if any
+      int rowPad = rowsize % psm.getUnpackAlignment();
+      
+      // should row be padded
+      if( rowPad == 0 ) {
+        // call teximage with srcImage untouched since its not padded
+        if( baseLevel <= level && level <= maxLevel ) {
+          srcImage.rewind();
+          gl.glTexImage2D( target, level, internalFormat, newwidth, newheight, 0, format, type, srcImage );
+          if (DEBUG) {
+            System.err.println("GL Error(" + level + "): " + gl.glGetError() );
+            try {
+              File file = new File( "glu2DMipmapJ" + level + ".bin" );
+              FileOutputStream fos = new FileOutputStream( file );
+              srcImage.limit( Mipmap.image_size( newwidth, newheight, format, type ) );
+              fos.getChannel().write( srcImage );
+              srcImage.clear();
+            } catch( IOException e ) {
+              System.err.println("IOException");
+              System.err.println(e.getMessage());
+            }
+          }
+        }
+      } else {
+        // compute length of new row in bytes, including padding
+        int newRowLength = rowsize + psm.getUnpackAlignment() - rowPad;
+        int ii, jj;
+        int dstTrav;
+        int srcTrav;
+        
+        // allocate new image for mipmap of size newRowLength x newheight
+        ByteBuffer newMipmapImage = null;
+        try {
+          newMipmapImage = ByteBuffer.allocateDirect( newRowLength * newheight );
+        } catch( OutOfMemoryError ome ) {
+          gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+          gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+          gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+          gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+          gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+          return( GLU.GLU_OUT_OF_MEMORY );
+        }
+        srcImage.rewind();
+        // copy image from srcImage into newMipmapImage by rows
+        for( ii = 0; ii < newheight; ii++ ) {
+          for( jj = 0; jj < rowsize; jj++ ) {
+            newMipmapImage.put( srcImage.get() );
+          }
+          if( jj < rowsize - 1 ) {
+            newMipmapImage.position( newMipmapImage.position() + rowPad );
+          }
+        }
+        
+        // and use this new image for mipmapping instead
+        if( baseLevel <= level && level <= maxLevel ) {
+          newMipmapImage.rewind();
+          gl.glTexImage2D( target, level, internalFormat, newwidth, newheight, 0, format, type, newMipmapImage );
+          if (DEBUG) {
+            System.err.println("GL Error: " + gl.glGetError() );
+            try {
+              File file = new File( "glu2DMipmapJ" + level + ".bin" );
+              FileOutputStream fos = new FileOutputStream( file );
+              srcImage.limit( Mipmap.image_size( newwidth, newheight, format, type ) );
+              fos.getChannel().write( newMipmapImage );
+              srcImage.clear();
+            } catch( IOException e ) {
+              System.err.println("IOException");
+              System.err.println(e.getMessage());
+            }
+          }
+        }
+      }
+    }
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, (psm.getUnpackSwapBytes() ? 1 : 0) );
+    
+    return( 0 );
+  }
+  
+  public static int fastBuild2DMipmaps( GL gl, PixelStorageModes psm, int target,
+          int components, int width, int height, int format, int type, ByteBuffer data ) {
+    int[] newwidth = new int[1];
+    int[] newheight = new int[1];
+    int level, levels;
+    ByteBuffer newImage;
+    int newImage_width;
+    int newImage_height;
+    ByteBuffer otherImage;
+    ByteBuffer imageTemp;
+    int memreq;
+    int maxsize;
+    int cmpts;
+    
+    Mipmap.closestFit( gl, target, width, height, components, format, type, newwidth, 
+            newheight );
+    
+    levels = Mipmap.computeLog( newwidth[0] );
+    level = Mipmap.computeLog( newheight[0] );
+    if( level > levels ) {
+      levels = level;
+    }
+    
+    cmpts = Mipmap.elements_per_group( format, type );
+    
+    otherImage = null;
+    //  No need to copy the user data if its packed correctly.
+    //  Make sure that later routines don't change that data.
+    
+    if( psm.getUnpackSkipRows() == 0 && psm.getUnpackSkipPixels() == 0 ) {
+      newImage = data;
+      newImage_width = width;
+      newImage_height = height;
+    } else {
+      int rowsize;
+      int group_per_line;
+      int elements_per_line;
+      int start;
+      int iter;
+      int iter2;
+      int i, j;
+      
+      try {
+        newImage = ByteBuffer.allocateDirect( Mipmap.image_size( 
+              width, height, format, GL.GL_UNSIGNED_BYTE ) ).order( ByteOrder.nativeOrder() );
+      } catch( OutOfMemoryError err ) {
+        return( GLU.GLU_OUT_OF_MEMORY );
+      }
+      newImage_width = width;
+      newImage_height = height;
+
+      // Abbreviated version of fill_image for the restricted case.
+      if( psm.getUnpackRowLength() > 0 ) {
+        group_per_line = psm.getUnpackRowLength();
+      } else {
+        group_per_line = width;
+      }
+      rowsize = group_per_line * cmpts;
+      elements_per_line = width * cmpts;
+      start = psm.getUnpackSkipRows() * rowsize + psm.getUnpackSkipPixels() * cmpts;
+      
+      for( i = 0; i < height; i++ ) {
+        iter = start;
+        data.position( iter );
+        for( j = 0; j < elements_per_line; j++ ) {
+          newImage.put( data.get() );
+        }
+        start += rowsize;
+      }
+    }
+    
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, 1 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, GL.GL_FALSE );
+    
+    for( level = 0; level <= levels; level++ ) {
+      if( newImage_width == newwidth[0] && newImage_height == newheight[0] ) {
+        // use newImage for this level
+        gl.glTexImage2D( target, level, components, newImage_width, newImage_height,
+                0, format, GL.GL_UNSIGNED_BYTE, newImage );
+      } else {
+        if( otherImage == null ) {
+          memreq = Mipmap.image_size( newwidth[0], newheight[0], format, GL.GL_UNSIGNED_BYTE );
+          try {
+            otherImage = ByteBuffer.allocateDirect( memreq ).order( ByteOrder.nativeOrder() );
+          } catch( OutOfMemoryError err ) {
+            gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+            gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+            gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+            gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+            gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, ( psm.getUnpackSwapBytes() ? 1 : 0 ) ) ;
+            return( GLU.GLU_OUT_OF_MEMORY );
+          }
+        }
+        // swap newImage and otherImage
+        imageTemp = otherImage;
+        otherImage = newImage;
+        newImage = imageTemp;
+        
+        newImage_width = newwidth[0];
+        newImage_height = newheight[0];
+        gl.glTexImage2D( target, level, components, newImage_width, newImage_height,
+                0, format, GL.GL_UNSIGNED_BYTE, newImage );
+      }
+      if( newwidth[0] > 1 ) {
+        newwidth[0] /= 2;
+      }
+      if( newheight[0] > 1 ) {
+        newheight[0] /= 2;
+      }
+    }
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, ( psm.getUnpackSwapBytes() ? 1 : 0 ) ) ;
+    
+    return( 0 );
+  }
+  
+  public static int gluBuild3DMipmapLevelsCore( GL gl, int target, int internalFormat,
+          int width, int height, int depth, int widthPowerOf2, int heightPowerOf2,
+          int depthPowerOf2, int format, int type, int userLevel, int baseLevel,
+          int maxLevel, ByteBuffer data ) {
+    int newWidth;
+    int newHeight;
+    int newDepth;
+    int level, levels;
+    ByteBuffer usersImage;
+    ByteBuffer srcImage, dstImage, tempImage;
+    int newImageWidth;
+    int newImageHeight;
+    int newImageDepth;
+    int memReq;
+    int maxSize;
+    int cmpts;
+    
+    boolean myswapBytes;
+    int groupsPerLine, elementSize, groupSize;
+    int rowsPerImage, imageSize;
+    int rowSize, padding;
+    PixelStorageModes psm = new PixelStorageModes();
+    
+    assert( Mipmap.checkMipmapArgs( internalFormat, format, type ) == 0 );
+    assert( width >= 1 && height >= 1 && depth >= 1 );
+    assert( type != GL.GL_BITMAP );
+    
+    srcImage = dstImage = null;
+    
+    newWidth = widthPowerOf2;
+    newHeight = heightPowerOf2;
+    newDepth = depthPowerOf2;
+    levels = Mipmap.computeLog( newWidth );
+    level = Mipmap.computeLog( newHeight );
+    if( level > levels ) {
+      levels = level;
+    }
+    level = Mipmap.computeLog( newDepth );
+    if( level > levels ) {
+      levels = level;
+    }
+    
+    levels += userLevel;
+    
+    Mipmap.retrieveStoreModes3D( gl, psm );
+    myswapBytes = psm.getUnpackSwapBytes();
+    cmpts = Mipmap.elements_per_group( format, type );
+    if( psm.getUnpackRowLength() > 0 ) {
+      groupsPerLine = psm.getUnpackRowLength();
+    } else {
+      groupsPerLine = width;
+    }
+    
+    elementSize = Mipmap.bytes_per_element( type );
+    groupSize = elementSize * cmpts;
+    if( elementSize == 1 ) {
+      myswapBytes = false;
+    }
+    
+    // 3dstuff
+    if( psm.getUnpackImageHeight() > 0 ) {
+      rowsPerImage = psm.getUnpackImageHeight();
+    } else {
+      rowsPerImage = height;
+    }
+    
+    rowSize = groupsPerLine * groupSize;
+    padding = ( rowSize % psm.getUnpackAlignment() );
+    if( padding != 0 ) {
+      rowSize += psm.getUnpackAlignment() - padding;
+    }
+    
+    imageSize = rowsPerImage * rowSize;
+    
+    usersImage = data.duplicate();
+    usersImage.position( psm.getUnpackSkipRows() * rowSize +
+                         psm.getUnpackSkipPixels() * groupSize +
+                         psm.getUnpackSkipImages() * imageSize );
+    usersImage.mark();
+    
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_IMAGES, 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_IMAGE_HEIGHT, 0 );
+    
+    level = userLevel;
+    
+    if( width == newWidth && height == newHeight && depth == newDepth ) {
+      // use usersImage for level userlevel
+      if( baseLevel <= level && level <= maxLevel ) {
+        gl.glTexImage3D( target, level, internalFormat, width, height, depth,
+                0, format, type, usersImage );
+      }
+      if( levels == 0 ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, psm.getUnpackSwapBytes() ? 1 : 0 );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_IMAGES, psm.getUnpackSkipImages() );
+        gl.glPixelStorei( GL.GL_UNPACK_IMAGE_HEIGHT, psm.getUnpackImageHeight() );
+        return( 0 );
+      }
+      int nextWidth = newWidth / 2;
+      int nextHeight = newHeight / 2;
+      int nextDepth = newDepth / 2;
+      
+      // clamp to one
+      if( nextWidth < 1 ) {
+        nextWidth = 1;
+      }
+      if( nextHeight < 1 ) {
+        nextHeight = 1;
+      }
+      if( nextDepth < 1 ) {
+        nextDepth = 1;
+      }
+      memReq = Mipmap.imageSize3D( nextWidth, nextHeight, nextDepth, format, type );
+      try {
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+          case( GL.GL_BYTE ):
+          case( GL.GL_UNSIGNED_SHORT ):
+          case( GL.GL_SHORT ):
+          case( GL.GL_UNSIGNED_INT ):
+          case( GL.GL_INT ):
+          case( GL.GL_FLOAT ):
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            dstImage = ByteBuffer.allocateDirect( memReq ).order( ByteOrder.nativeOrder() );
+            break;
+          default:
+            return( GLU.GLU_INVALID_ENUM );
+        }
+      } catch( OutOfMemoryError err ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, psm.getUnpackSwapBytes() ? 1 : 0 );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_IMAGES, psm.getUnpackSkipImages() );
+        gl.glPixelStorei( GL.GL_UNPACK_IMAGE_HEIGHT, psm.getUnpackImageHeight() );
+        return( GLU.GLU_OUT_OF_MEMORY );
+      }
+      
+      if( dstImage != null ) {
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+            if( depth > 1 ) {
+              HalveImage.halveImage3D( cmpts, new ExtractUByte(), width, height, depth,
+                      usersImage, dstImage, elementSize, 
+                      groupSize, rowSize, imageSize, myswapBytes );
+            } else {
+              HalveImage.halveImage_ubyte( cmpts, width, height, usersImage,
+                      dstImage, elementSize, rowSize, groupSize );
+            }
+            break;
+          case( GL.GL_BYTE ):
+            if( depth > 1 ) {
+              HalveImage.halveImage3D( cmpts, new ExtractSByte(), width, height, depth,
+                      usersImage, dstImage, elementSize, groupSize, rowSize,
+                      imageSize, myswapBytes );
+            } else {
+              HalveImage.halveImage_byte( cmpts, width, height, usersImage,
+                      dstImage, elementSize, rowSize, groupSize );
+            }
+            break;
+          case( GL.GL_UNSIGNED_SHORT ):
+            if( depth > 1 ) {
+              HalveImage.halveImage3D( cmpts, new ExtractUShort(), width, height, depth,
+                      usersImage, dstImage, elementSize, groupSize, rowSize,
+                      imageSize, myswapBytes );
+            } else {
+              HalveImage.halveImage_ushort( cmpts, width, height, usersImage, 
+                      dstImage.asShortBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+            }
+            break;
+          case( GL.GL_SHORT ):
+            if( depth > 1 ) {
+              HalveImage.halveImage3D( cmpts, new ExtractSShort(), width, height, depth,
+                      usersImage, dstImage, elementSize, groupSize, rowSize,
+                      imageSize, myswapBytes );
+            } else {
+              HalveImage.halveImage_short( cmpts, width, height, usersImage,
+                      dstImage.asShortBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+            }
+            break;
+          case( GL.GL_UNSIGNED_INT ):
+            if( depth > 1 ) {
+              HalveImage.halveImage3D( cmpts, new ExtractUInt(), width, height, depth,
+                      usersImage, dstImage, elementSize, groupSize, rowSize,
+                      imageSize, myswapBytes );
+            } else {
+              HalveImage.halveImage_uint( cmpts, width, height, usersImage,
+                      dstImage.asIntBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+            }
+            break;
+          case( GL.GL_INT ):
+            if( depth > 1 ) {
+              HalveImage.halveImage3D( cmpts, new ExtractSInt(), width, height, depth,
+                      usersImage, dstImage, elementSize, groupSize, rowSize,
+                      imageSize, myswapBytes );
+            } else {
+              HalveImage.halveImage_int( cmpts, width, height, usersImage,
+                      dstImage.asIntBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+            }
+            break;
+          case( GL.GL_FLOAT ):
+            if( depth > 1 ) {
+              HalveImage.halveImage3D( cmpts, new ExtractFloat(), width, height, depth,
+                      usersImage, dstImage, elementSize, groupSize, rowSize,
+                      imageSize, myswapBytes );
+            } else {
+              HalveImage.halveImage_float( cmpts, width, height, usersImage,
+                      dstImage.asFloatBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+            }
+            break;
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+            assert( format == GL.GL_RGB );
+            HalveImage.halveImagePackedPixel3D( 3, new Extract332(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+            assert( format == GL.GL_RGB );
+            HalveImage.halveImagePackedPixel3D( 3, new Extract233rev(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+            HalveImage.halveImagePackedPixel3D( 3, new Extract565(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+            HalveImage.halveImagePackedPixel3D( 3, new Extract565rev(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract4444(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract4444rev(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract5551(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract1555rev(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract8888(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract8888rev(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract1010102(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            HalveImage.halveImagePackedPixel3D( 4, new Extract2101010rev(), width, height, depth, usersImage,
+                    dstImage, elementSize, rowSize, imageSize, myswapBytes );
+            break;
+          default:
+            assert( false );
+            break;
+        }
+      }
+      newWidth = width / 2;
+      newHeight = height / 2;
+      newDepth = depth / 2;
+      // clamp to 1
+      if( newWidth < 1 ) {
+        newWidth = 1;
+      }
+      if( newHeight < 1 ) {
+        newHeight = 1;
+      }
+      if( newDepth < 1 ) {
+        newDepth = 1;
+      }
+      
+      myswapBytes = false;
+      rowSize = newWidth * groupSize;
+      imageSize = rowSize * newHeight;
+      memReq = Mipmap.imageSize3D( newWidth, newHeight, newDepth, format, type );
+      // swap srcImage and dstImage
+      tempImage = srcImage;
+      srcImage = dstImage;
+      dstImage = tempImage;
+      try {
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+          case( GL.GL_BYTE ):
+          case( GL.GL_UNSIGNED_SHORT ):
+          case( GL.GL_SHORT ):
+          case( GL.GL_UNSIGNED_INT ):
+          case( GL.GL_INT ):
+          case( GL.GL_FLOAT ):
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            dstImage = ByteBuffer.allocateDirect( memReq ).order( ByteOrder.nativeOrder() );
+            break;
+          default:
+            return( GLU.GLU_INVALID_ENUM );
+        }
+      } catch( OutOfMemoryError err ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, psm.getUnpackSwapBytes() ? 1 : 0 );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_IMAGES, psm.getUnpackSkipImages() );
+        gl.glPixelStorei( GL.GL_UNPACK_IMAGE_HEIGHT, psm.getUnpackImageHeight() );
+        return( GLU.GLU_OUT_OF_MEMORY );
+      }
+      
+      // level userLevel + 1 is in srcImage; level userLevel already saved
+      level = userLevel + 1;
+    } else {
+      memReq = Mipmap.imageSize3D( newWidth, newHeight, newDepth, format, type );
+      try {
+        switch( type ) {
+          case( GL.GL_UNSIGNED_BYTE ):
+          case( GL.GL_BYTE ):
+          case( GL.GL_UNSIGNED_SHORT ):
+          case( GL.GL_SHORT ):
+          case( GL.GL_UNSIGNED_INT ):
+          case( GL.GL_INT ):
+          case( GL.GL_FLOAT ):
+          case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+            dstImage = ByteBuffer.allocateDirect( memReq ).order( ByteOrder.nativeOrder() );
+            break;
+          default:
+            return( GLU.GLU_INVALID_ENUM );
+        }
+      } catch( OutOfMemoryError err ) {
+        gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+        gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+        gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, psm.getUnpackSwapBytes() ? 1 : 0 );
+        gl.glPixelStorei( GL.GL_UNPACK_SKIP_IMAGES, psm.getUnpackSkipImages() );
+        gl.glPixelStorei( GL.GL_UNPACK_IMAGE_HEIGHT, psm.getUnpackImageHeight() );
+        return( GLU.GLU_OUT_OF_MEMORY );
+      }
+      
+      ScaleInternal.gluScaleImage3D( gl, format, width, height, depth, type,
+              usersImage, newWidth, newHeight, newDepth, type, dstImage );
+      
+      myswapBytes = false;
+      rowSize = newWidth * groupSize;
+      imageSize = rowSize * newHeight;
+      // swap dstImage and srcImage
+      tempImage = srcImage;
+      srcImage = dstImage;
+      dstImage = tempImage;
+      
+      if( levels != 0 ) {
+        int nextWidth = newWidth / 2;
+        int nextHeight = newHeight / 2;
+        int nextDepth = newDepth / 2;
+        if( nextWidth < 1 ) {
+          nextWidth = 1;
+        }
+        if( nextHeight < 1 ) {
+          nextHeight = 1;
+        }
+        if( nextDepth < 1 ) {
+          nextDepth = 1;
+        }
+        memReq = Mipmap.imageSize3D( nextWidth, nextHeight, nextDepth, format, type );
+        try {
+          switch( type ) {
+            case( GL.GL_UNSIGNED_BYTE ):
+            case( GL.GL_BYTE ):
+            case( GL.GL_UNSIGNED_SHORT ):
+            case( GL.GL_SHORT ):
+            case( GL.GL_UNSIGNED_INT ):
+            case( GL.GL_INT ):
+            case( GL.GL_FLOAT ):
+            case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+            case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+            case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+            case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+            case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+            case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+            case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+            case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+            case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+            case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+            case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+            case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+              dstImage = ByteBuffer.allocateDirect( memReq ).order( ByteOrder.nativeOrder() );
+              break;
+            default:
+              return( GLU.GLU_INVALID_ENUM );
+          }
+        } catch( OutOfMemoryError err ) {
+          gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+          gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+          gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+          gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+          gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, psm.getUnpackSwapBytes() ? 1 : 0 );
+          gl.glPixelStorei( GL.GL_UNPACK_SKIP_IMAGES, psm.getUnpackSkipImages() );
+          gl.glPixelStorei( GL.GL_UNPACK_IMAGE_HEIGHT, psm.getUnpackImageHeight() );
+          return( GLU.GLU_OUT_OF_MEMORY );
+        }
+      }
+      // level userLevel is in srcImage; nothing saved yet
+      level = userLevel;
+    }
+    
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, GL.GL_FALSE );
+    if( baseLevel <= level && level <= maxLevel ) {
+      usersImage.reset();
+      gl.glTexImage3D( target, level, internalFormat, width, height, depth,
+              0, format, type, usersImage );
+    }
+    level++;
+    for( ; level <= levels; level++ ) {
+      switch( type ) {
+        case( GL.GL_UNSIGNED_BYTE ):
+          if( depth > 1 ) {
+            HalveImage.halveImage3D( cmpts, new ExtractUByte(), width, height, depth,
+                    usersImage, dstImage, elementSize, groupSize, rowSize,
+                    imageSize, myswapBytes );
+          } else {
+            HalveImage.halveImage_ubyte( cmpts, width, height, usersImage,
+                    dstImage, elementSize, rowSize, groupSize );
+          }
+          break;
+        case( GL.GL_BYTE ):
+          if( depth > 1 ) {
+            HalveImage.halveImage3D( cmpts, new ExtractSByte(), width, height, depth,
+                    usersImage, dstImage, elementSize, groupSize, rowSize,
+                    imageSize, myswapBytes );
+          } else {
+            HalveImage.halveImage_byte( cmpts, width, height, usersImage,
+                    dstImage, elementSize, rowSize, groupSize );
+          }
+          break;
+        case( GL.GL_UNSIGNED_SHORT ):
+          if( depth > 1 ) {
+            HalveImage.halveImage3D( cmpts, new ExtractUShort(), width, height, depth,
+                    usersImage, dstImage, elementSize, groupSize, rowSize,
+                    imageSize, myswapBytes );
+          } else {
+            HalveImage.halveImage_ushort( cmpts, width, height, usersImage,
+                    dstImage.asShortBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+          }
+          break;
+        case( GL.GL_SHORT ):
+          if( depth > 1 ) {
+            HalveImage.halveImage3D( cmpts, new ExtractSShort(), width, height, depth,
+                    usersImage, dstImage, elementSize, groupSize, rowSize,
+                    imageSize, myswapBytes );
+          } else {
+            HalveImage.halveImage_short( cmpts, width, height, usersImage,
+                    dstImage.asShortBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+          }
+          break;
+        case( GL.GL_UNSIGNED_INT ):
+          if( depth > 1 ) {
+            HalveImage.halveImage3D( cmpts, new ExtractUInt(), width, height, depth,
+                    usersImage, dstImage, elementSize, groupSize, rowSize,
+                    imageSize, myswapBytes );
+          } else {
+            HalveImage.halveImage_uint( cmpts, width, height, usersImage,
+                    dstImage.asIntBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+          }
+          break;
+        case( GL.GL_INT ):
+          if( depth > 1 ) {
+            HalveImage.halveImage3D( cmpts, new ExtractSInt(), width, height, depth,
+                    usersImage, dstImage, elementSize, groupSize, rowSize,
+                    imageSize, myswapBytes );
+          } else {
+            HalveImage.halveImage_int( cmpts, width, height, usersImage,
+                    dstImage.asIntBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+          }
+          break;
+        case( GL.GL_FLOAT ):
+          if( depth > 1 ) {
+            HalveImage.halveImage3D( cmpts, new ExtractFloat(), width, height, depth,
+                    usersImage, dstImage, elementSize, groupSize, rowSize,
+                    imageSize, myswapBytes );
+          } else {
+            HalveImage.halveImage_float( cmpts, width, height, usersImage,
+                    dstImage.asFloatBuffer(), elementSize, rowSize, groupSize, myswapBytes );
+          }
+          break;
+        case( GL.GL_UNSIGNED_BYTE_3_3_2 ):
+          HalveImage.halveImagePackedPixel3D( 3, new Extract332(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_BYTE_2_3_3_REV ):
+          HalveImage.halveImagePackedPixel3D( 3, new Extract233rev(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_5_6_5 ):
+          HalveImage.halveImagePackedPixel3D( 3, new Extract565(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_5_6_5_REV ):
+          HalveImage.halveImagePackedPixel3D( 3, new Extract565rev(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_4_4_4_4 ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract4444(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_4_4_4_4_REV ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract4444rev(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_5_5_5_1 ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract5551(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_SHORT_1_5_5_5_REV ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract1555rev(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_8_8_8_8 ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract8888(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_8_8_8_8_REV ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract8888rev(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_10_10_10_2 ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract1010102(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        case( GL.GL_UNSIGNED_INT_2_10_10_10_REV ):
+          HalveImage.halveImagePackedPixel3D( 4, new Extract2101010rev(), width, height, depth, usersImage,
+                  dstImage, elementSize, rowSize, imageSize, myswapBytes );
+          break;
+        default:
+          assert( false );
+          break;
+      }
+      
+      tempImage = srcImage;
+      srcImage = dstImage;
+      dstImage = tempImage;
+      
+      if( newWidth > 1 ) {
+        newWidth /= 2;
+        rowSize /= 2;
+      }
+      if( newHeight > 1 ) {
+        newHeight /= 2;
+        imageSize = rowSize * newHeight;
+      }
+      if( newDepth > 1 ) {
+        newDepth /= 2;
+      }
+      if( baseLevel <= level && level <= maxLevel ) {
+        usersImage.reset();
+        gl.glTexImage3D( target, level, internalFormat, width, height, depth,
+                0, format, type, usersImage );
+      }
+    }
+    gl.glPixelStorei( GL.GL_UNPACK_ALIGNMENT, psm.getUnpackAlignment() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_ROWS, psm.getUnpackSkipRows() );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_PIXELS, psm.getUnpackSkipPixels() );
+    gl.glPixelStorei( GL.GL_UNPACK_ROW_LENGTH, psm.getUnpackRowLength() );
+    gl.glPixelStorei( GL.GL_UNPACK_SWAP_BYTES, psm.getUnpackSwapBytes() ? 1 : 0 );
+    gl.glPixelStorei( GL.GL_UNPACK_SKIP_IMAGES, psm.getUnpackSkipImages() );
+    gl.glPixelStorei( GL.GL_UNPACK_IMAGE_HEIGHT, psm.getUnpackImageHeight() );
+    return( 0 );
+  }
+}