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-_C_ License Applicability. Except to the extent portions of this file are
-_C_ made subject to an alternative license as permitted in the SGI Free
-_C_ Software License B, Version 1.1 (the "License"), the contents of this
-_C_ file are subject only to the provisions of the License. You may not use
-_C_ this file except in compliance with the License. You may obtain a copy
-_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
-_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
-_C_ 
-_C_ http://oss.sgi.com/projects/FreeB
-_C_ 
-_C_ Note that, as provided in the License, the Software is distributed on an
-_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
-_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
-_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
-_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
-_C_ 
-_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
-_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
-_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
-_C_ Copyright in any portions created by third parties is as indicated
-_C_ elsewhere herein. All Rights Reserved.
-_C_ 
-_C_ Additional Notice Provisions: The application programming interfaces
-_C_ established by SGI in conjunction with the Original Code are The
-_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
-_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
-_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
-_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
-_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
-_C_ published by SGI, but has not been independently verified as being
-_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
-_C_
-_C_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
-_C_ The first character in this file must be an '_'!
-_C_ Anything on a line after _C_ is ignored
-_define(_filters,eqn)_C_
-_C_      eqn is automatically replaced with neqn for nroff
-_header(Build2DMipmaps, builds a two-dimensional mipmap)
-_names(Build2DMipmaps)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the target texture.  Must be _const(TEXTURE_2D).
-_phead(_param2)
-Requests the internal storage format of the texture image.  The most
-current version of the SGI implementation of GLU does not check this
-value for validity before passing it on to the underlying OpenGL
-implementation.  A value that is not accepted by the OpenGL
-implementation will lead to an OpenGL error.  The benefit of not
-checking this value at the GLU level is that OpenGL extensions can add
-new internal texture formats without requiring a revision of the GLU
-implementation.  Older implementations of GLU check this value and
-raise a GLU error if it is not 1, 2, 3, or 4 or one of the following
-symbolic constants:
-_const(ALPHA),
-_const(ALPHA4),
-_const(ALPHA8),
-_const(ALPHA12),
-_const(ALPHA16),
-_const(LUMINANCE),
-_const(LUMINANCE4),
-_const(LUMINANCE8),
-_const(LUMINANCE12),
-_const(LUMINANCE16),
-_const(LUMINANCE_ALPHA),
-_const(LUMINANCE4_ALPHA4),
-_const(LUMINANCE6_ALPHA2),
-_const(LUMINANCE8_ALPHA8),
-_const(LUMINANCE12_ALPHA4),
-_const(LUMINANCE12_ALPHA12),
-_const(LUMINANCE16_ALPHA16),
-_const(INTENSITY),
-_const(INTENSITY4),
-_const(INTENSITY8),
-_const(INTENSITY12),
-_const(INTENSITY16),
-_const(RGB),
-_const(R3_G3_B2),
-_const(RGB4),
-_const(RGB5),
-_const(RGB8),
-_const(RGB10),
-_const(RGB12),
-_const(RGB16),
-_const(RGBA),
-_const(RGBA2),
-_const(RGBA4),
-_const(RGB5_A1),
-_const(RGBA8),
-_const(RGB10_A2),
-_const(RGBA12) or
-_const(RGBA16).
-_phead(_param3 _param4)
-Specifies in pixels the width and height, respectively, of the texture image. 
-_phead(_param5)
-Specifies the format of the pixel data.
-Must be one of
-_const(COLOR_INDEX),
-_const(DEPTH_COMPONENT),
-_const(RED),
-_const(GREEN),
-_const(BLUE),
-_const(ALPHA),
-_const(RGB),
-_const(RGBA),
-_const(BGR),
-_const(BGRA),
-_const(LUMINANCE), or
-_const(LUMINANCE_ALPHA).
-_phead(_param6)
-Specifies the data type for _param7.
-Must be one of
-_const(UNSIGNED_BYTE),
-_const(BYTE),
-_const(BITMAP),
-_const(UNSIGNED_SHORT),
-_const(SHORT),
-_const(UNSIGNED_INT),
-_const(INT), 
-_const(FLOAT), 
-_const(UNSIGNED_BYTE_3_3_2),
-_const(UNSIGNED_BYTE_2_3_3_REV),
-_const(UNSIGNED_SHORT_5_6_5),
-_const(UNSIGNED_SHORT_5_6_5_REV),
-_const(UNSIGNED_SHORT_4_4_4_4),
-_const(UNSIGNED_SHORT_4_4_4_4_REV),
-_const(UNSIGNED_SHORT_5_5_5_1),
-_const(UNSIGNED_SHORT_1_5_5_5_REV),
-_const(UNSIGNED_INT_8_8_8_8),
-_const(UNSIGNED_INT_8_8_8_8_REV),
-_const(UNSIGNED_INT_10_10_10_2), or
-_const(UNSIGNED_INT_2_10_10_10_REV).
-_phead(_param7)
-Specifies a pointer to the image data in memory.
-
-
-.SH DESCRIPTION
-_cmnd builds a series of prefiltered two-dimensional texture maps of decreasing
-resolutions called a mipmap. This is used for the antialiasing of
-texture-mapped primitives.
-.P
-A return value of zero indicates success, otherwise a GLU error code is
-returned (see _cmnd(ErrorString)).
-.P
-Initially, the _param3 and _param4 of _param7 are checked to see if they
-are a power of 2. If not, a copy of _param7 (not _param7), is scaled up
-or down to the nearest power of 2. This copy will be used for subsequent
-mipmapping operations described below. (If _param3 or _param4 is exactly
-between powers of 2, then the copy of _param7 will scale upwards.)  For
-example, if _param3 is 57 and _param4 is 23 then a copy of _param7 will
-scale up to 64 in _param3 and down to 16 in depth, before mipmapping takes
-place.
-.P
-Then, proxy textures (see _glcmnd(TexImage2D)) are used to determine if
-the implementation can fit the requested texture. If not, both dimensions
-are continually halved until it fits. (If the OpenGL version is \(<= 1.0,
-both maximum texture dimensions are clamped to the value returned
-by _glcmnd(GetIntegerv) with the argument _const(MAX_TEXTURE_SIZE).)
-.P
-Next, a series of mipmap levels is built by decimating a copy of _param7
-in half along both dimensions until size $1 ~times~ 1$ is reached. At
-each level,
-each texel in the halved mipmap level is an average of the corresponding
-four texels in the larger mipmap level. (In the case of rectangular
-images, the decimation will ultimately reach an $N ~times~ 1$ or
-$1 ~times~ N$ configuration. Here, two texels are averaged instead.)
-.P
-_glcmnd(TexImage2D) is called to load each of these mipmap levels.
-Level 0 is a copy of _param7.  The highest level is
-${log sub 2} ( max (_eqnparam3,_eqnparam4))$.  For example,
-if _param3 is 64 and _param4 is 16
-and the implementation can store a texture of this size, the following
-mipmap levels are built: $64 ~times~ 16$, $32 ~times~ 8$, $16 ~times~ 4$,
-$8 ~times~ 2$, $4 ~times~ 1$, $2 ~times~ 1$ and $1 ~times~ 1$. These correspond to
-levels 0 through 6, respectively.
-.P
-See the _glcmnd(TexImage1D) reference page for a description of the
-acceptable values for _param5 parameter. See the _glcmnd(DrawPixels) 
-reference page for a description of the acceptable values 
-for _param6 parameter.
-.SH NOTES
-
-Note that there is no direct way of querying the maximum level. This can
-be derived indirectly via _glcmnd(GetTexLevelParameter). First, query
-for the width and height actually used at level 0.  (The width and
-height may not be equal to _param3 and _param4 respectively since proxy
-textures might have scaled them to fit the implementation.)  Then the
-maximum level can be derived from the formula
-${log sub 2}( max (_param3,_param4))$.
-.SH NOTES
-Formats _const(BGR), and _const(BGRA), and types 
-_const(UNSIGNED_BYTE_3_3_2),
-_const(UNSIGNED_BYTE_2_3_3_REV),
-_const(UNSIGNED_SHORT_5_6_5),
-_const(UNSIGNED_SHORT_5_6_5_REV),
-_const(UNSIGNED_SHORT_4_4_4_4),
-_const(UNSIGNED_SHORT_4_4_4_4_REV),
-_const(UNSIGNED_SHORT_5_5_5_1),
-_const(UNSIGNED_SHORT_1_5_5_5_REV),
-_const(UNSIGNED_INT_8_8_8_8),
-_const(UNSIGNED_INT_8_8_8_8_REV),
-_const(UNSIGNED_INT_10_10_10_2), and
-_const(UNSIGNED_INT_2_10_10_10_REV) are only available if the GL version 
-is 1.2 or greater and if the GLU version is 1.3 or greater.
-.SH ERRORS
-_gluconst(INVALID_VALUE) is returned if _param3, or _param4 is < 1.
-.P
-_gluconst(INVALID_ENUM) is returned if _param2, _param5, or _param6 is not 
-legal.
-.P
-_gluconst(INVALID_OPERATION) is returned if _param6 is _const(UNSIGNED_BYTE_3_3_2) or _const(UNSIGNED_BYTE_2_3_3_REV)
-and _param5 is not _const(RGB).
-.P
-_gluconst(INVALID_OPERATION) is returned if _param6 is _const(UNSIGNED_SHORT_5_6_5) or _const(UNSIGNED_SHORT_5_6_5_REV)
-and _param5 is not _const(RGB).
-.P
-_gluconst(INVALID_OPERATION) is returned if _param6 is _const(UNSIGNED_SHORT_4_4_4_4) or _const(UNSIGNED_SHORT_4_4_4_4_REV)
-and _param5 is neither _const(RGBA) nor _const(BGRA).
-.P
-_gluconst(INVALID_OPERATION) is returned if _param6 is _const(UNSIGNED_SHORT_5_5_5_1) or _const(UNSIGNED_SHORT_1_5_5_5_REV)
-and _param5 is neither _const(RGBA) nor _const(BGRA).
-.P
-_gluconst(INVALID_OPERATION) is returned if _param6 is _const(UNSIGNED_INT_8_8_8_8) or _const(UNSIGNED_INT_8_8_8_8_REV)
-and _param5 is neither _const(RGBA) nor _const(BGRA).
-.P
-_gluconst(INVALID_OPERATION) is returned if _param6 is _const(UNSIGNED_INT_10_10_10_2) or _const(UNSIGNED_INT_2_10_10_10_REV)
-and _param5 is neither _const(RGBA) nor _const(BGRA).
-.SH SEE ALSO
-_glcmnd(DrawPixels),
-_glcmnd(TexImage1D),
-_glcmnd(TexImage2D), 
-_glcmnd(TexImage3D),
-_cmnd(Build1DMipmaps),
-_cmnd(Build3DMipmaps),
-_cmnd(ErrorString), 
-_glcmnd(GetTexImage),
-_glcmnd(GetTexLevelParameter),
-_cmnd(Build1DMipmapLevels),
-_cmnd(Build2DMipmapLevels),
-_cmnd(Build3DMipmapLevels)