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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_ 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(TexImage3D,specify a three-dimensional texture image)
-_names(TexImage3D)
-.EQ
-delim $$
-.EN
-_define(@<__target>@,@<_param1>@)_C_
-_define(@<__level>@,@<_param2>@)_C_
-_define(@<__internalformat>@,@<_param3>@)_C_
-_define(@<__width>@,@<_param4>@)_C_
-_define(@<__height>@,@<_param5>@)_C_
-_define(@<__depth>@,@<_param6>@)_C_
-_define(@<__border>@,@<_param7>@)_C_
-_define(@<__eqnborder>@,@<_eqnparam7>@)_C_
-_define(@<__format>@,@<_param8>@)_C_
-_define(@<__type>@,@<_param9>@)_C_
-_define(@<__pixels>@,@<_param10>@)_C_
-.SH PARAMETERS
-_phead(__target)
-Specifies the target texture.
-Must be _const(TEXTURE_3D) or _const(PROXY_TEXTURE_3D).
-_phead(__level)
-Specifies the level-of-detail number.
-Level 0 is the base image level.
-Level $n$ is the $n sup th$ mipmap reduction image.
-_phead(__internalformat)
-Specifies the number of color components in the texture.
-Must be 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(R3_G3_B2),
-_const(RGB),
-_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(__width)
-Specifies the width of the texture image.
-Must be $2 sup n ~+~ 2 ( __eqnborder )$ for some integer $n$. All
-implementations support texture images that are at least 64 texels
-wide.
-_phead(__height)
-Specifies the height of the texture image.
-Must be $2 sup m ~+~ 2 ( __eqnborder )$ for some integer $m$. All
-implementations support texture images that are at least 64 texels
-high.
-_phead(__depth)
-Specifies the depth of the texture image.
-Must be $2 sup k ~+~ 2 ( __eqnborder )$ for some integer $k$. All
-implementations support texture images that are at least 64 texels
-deep.
-_phead(__border)
-Specifies the width of the border.
-Must be either 0 or 1.
-_phead(__format)
-Specifies the format of the pixel data.
-The following symbolic values are accepted:
-_const(COLOR_INDEX),
-_const(RED),
-_const(GREEN),
-_const(BLUE),
-_const(ALPHA),
-_const(RGB),
-_const(BGR),
-_const(RGBA),
-_const(BGRA),
-_C_ _const(ABGR_EXT),
-_const(LUMINANCE), and
-_const(LUMINANCE_ALPHA).
-_phead(__type)
-Specifies the data type of the pixel data.
-The following symbolic values are accepted:
-_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), and
-_const(UNSIGNED_INT_2_10_10_10_REV).
-_phead(__pixels)
-Specifies a pointer to the image data in memory.
-.SH DESCRIPTION
-Texturing maps a portion of a specified texture image
-onto each graphical primitive for which texturing is enabled.
-To enable and disable three-dimensional texturing, call _cmnd(Enable)
-and _cmnd(Disable) with argument _const(TEXTURE_3D).
-.P
-To define texture images, call _cmnd. 
-The arguments describe the parameters of the texture image,
-such as height,
-width, depth,
-width of the border,
-level-of-detail number
-(see _cmnd(TexParameter)),
-and number of color components provided.
-The last three arguments describe how the image is represented in memory;
-they are identical to the pixel formats used for _cmnd(DrawPixels).
-.P
-If __target is _const(PROXY_TEXTURE_3D), no data is read from __pixels, but
-all of the texture image state is recalculated, checked for
-consistency, and checked 
-against the implementation's capabilities. If the implementation cannot
-handle a texture of the requested texture size, it sets
-all of the image state to 0,
-but does not generate an error (see _cmnd(GetError)). To query for an
-entire mipmap array, use an image array level greater than or equal to
-1. 
-.P 
-If __target is _const(TEXTURE_3D),
-data is read from __pixels as a sequence of signed or unsigned bytes,
-shorts,
-or longs,
-or single-precision floating-point values,
-depending on __type. 
-These values are grouped into sets of one,
-two,
-three,
-or four values,
-depending on __format,
-to form elements. 
-If __type is _const(BITMAP),
-the data is considered as a string of unsigned bytes (and
-__format must be _const(COLOR_INDEX)). 
-Each data byte is treated as eight 1-bit elements,
-with bit ordering determined by _const(UNPACK_LSB_FIRST)
-(see _cmnd(PixelStore)).
-.P
-The first element corresponds to the lower left corner of the texture
-image.
-Subsequent elements progress left-to-right through the remaining texels
-in the lowest row of the texture image, and then in successively higher
-rows of the texture image.
-The final element corresponds to the upper right corner of the texture
-image.
-.P
-__format determines the composition of each element in __pixels.
-It can assume one of eleven symbolic values:
-.TP 10
-_const(COLOR_INDEX)
-Each element is a single value,
-a color index. 
-The GL converts it to fixed point
-(with an unspecified number of zero bits to the right of the binary point),
-shifted left or right depending on the value and sign of _const(INDEX_SHIFT),
-and added to _const(INDEX_OFFSET)
-(see 
-.br
-_cmnd(PixelTransfer)). 
-The resulting index is converted to a set of color components
-using the
-_const(PIXEL_MAP_I_TO_R),
-_const(PIXEL_MAP_I_TO_G),
-_const(PIXEL_MAP_I_TO_B), and
-_const(PIXEL_MAP_I_TO_A) tables,
-and clamped to the range [0,1].
-.TP
-_const(RED)
-Each element is a single red component. 
-The GL converts it to floating point and assembles it into an RGBA element
-by attaching 0 for green and blue, and 1 for alpha. 
-Each component is then multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see _cmnd(PixelTransfer)).
-.TP
-_const(GREEN)
-Each element is a single green component. 
-The GL converts it to floating point and assembles it into an RGBA element
-by attaching 0 for red and blue, and 1 for alpha. 
-Each component is then multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see _cmnd(PixelTransfer)).
-.TP
-_const(BLUE)
-Each element is a single blue component. 
-The GL converts it to floating point and assembles it into an RGBA element
-by attaching 0 for red and green, and 1 for alpha. 
-Each component is then multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see _cmnd(PixelTransfer)).
-.TP
-_const(ALPHA)
-Each element is a single alpha component. 
-The GL converts it to floating point and assembles it into an RGBA element
-by attaching 0 for red, green, and blue.
-Each component is then multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see _cmnd(PixelTransfer)).
-.TP
-_const(RGB)
-.TP
-_const(BGR)
-Each element is an RGB triple.
-The GL converts it to floating point and assembles it into an RGBA element
-by attaching 1 for alpha.
-Each component is then multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see 
-.br
-_cmnd(PixelTransfer)).
-.TP
-_const(RGBA)
-.TP
-_const(BGRA)
-_C_ .TP
-_C_ _const(ABGR_EXT)
-Each element contains all four components.
-Each component is multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see _cmnd(PixelTransfer)).
-.TP
-_const(LUMINANCE)
-Each element is a single luminance value.
-The GL converts it to floating point,
-then assembles it into an RGBA element by replicating the luminance value
-three times for red, green, and blue and attaching 1 for alpha. 
-Each component is then multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see _cmnd(PixelTransfer)).
-.TP
-_const(LUMINANCE_ALPHA)
-Each element is a luminance/alpha pair.
-The GL converts it to floating point,
-then assembles it into an RGBA element by replicating the luminance value
-three times for red, green, and blue.
-Each component is then multiplied by the signed scale factor _const(c_SCALE),
-added to the signed bias _const(c_BIAS),
-and clamped to the range [0,1]
-(see 
-.br
-_cmnd(PixelTransfer)).
-.P
-Refer to the _cmnd(DrawPixels) reference page for a description of
-the acceptable values for the __type parameter.
-.P
-If an application wants to store the texture at a certain
-resolution or in a certain format, it can request the resolution
-and format with __internalformat. The GL will choose an internal
-representation that closely approximates that requested by __internalformat, but
-it may not match exactly.
-(The representations specified by _const(LUMINANCE),
-_const(LUMINANCE_ALPHA), _const(RGB),
-and _const(RGBA) must match exactly. The numeric values 1, 2, 3, and 4
-may also be used to specify the above representations.)
-.P
-Use the _const(PROXY_TEXTURE_3D) target to try out a resolution and
-format. The implementation will
-update and recompute its best match for the requested storage resolution
-and format. To then query this state, call
-_cmnd(GetTexLevelParameter).
-If the texture cannot be accommodated, texture state is set to 0.
-.P
-A one-component texture image uses only the red component of the RGBA
-color extracted from __pixels. 
-A two-component image uses the R and A values.
-A three-component image uses the R, G, and B values.
-A four-component image uses all of the RGBA components. 
-.SH NOTES
-Texturing has no effect in color index mode.
-.P
-The texture image can be represented by the same data formats
-as the pixels in a _cmnd(DrawPixels) command,
-except that _const(STENCIL_INDEX) and _const(DEPTH_COMPONENT)
-cannot be used.
-_cmnd(PixelStore) and _cmnd(PixelTransfer) modes affect texture images
-in exactly the way they affect _cmnd(DrawPixels).
-.P
-_C_ _const(ABGR_EXT) is
-_C_ part of the _extname(EXT_abgr) extension, not part of
-_C_ the core GL command set.  If _extstring(EXT_abgr) is included
-_C_ in the string returned by _cmnd(GetString), when called with
-_C_ argument _const(EXTENSIONS), extension _extname(EXT_abgr) is
-_C_ supported by the GL.
-.P
-_cmnd is available only if the GL version is 1.2 or greater. 
-.P
-Internal formats other than 1, 2, 3, or 4 may be used only if the GL
-version is 1.1 or greater.
-.P
-__pixels may be a null pointer. 
-In this case texture memory is
-allocated to accommodate a texture of width __width, height __height,
-and depth __depth.
-You can then download subtextures to initialize this
-texture memory. 
-The image is undefined if the user tries to apply
-an uninitialized portion of the texture image to a primitive.
-.P
-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 available only if the GL version 
-is 1.2 or greater.
-.P
-When the _arbstring(multitexture) extension is supported, _cmnd
-specifies the three-dimensional texture for the current texture unit,
-specified with _cmnd(ActiveTextureARB).
-.P
-If the _arbstring(imaging) extension is supported, RGBA elements may
-also be processed by the imaging pipeline.  The following stages may be
-applied to an RGBA color before color component clamping to the range
-[0,\ 1]:
-.TP 3
-1. Color component replacement by the color table specified for
-_const(COLOR_TABLE), if enabled. See _cmnd(ColorTable).
-.TP
-2. Color component replacement by the color table specified for
-_const(POST_CONVOLUTION_COLOR_TABLE), if enabled.  See _cmnd(ColorTable).
-.TP
-3. Transformation by the color matrix.  See _cmnd(MatrixMode).
-.TP
-4. RGBA components may be multiplied by _const(POST_COLOR_MATRIX_c_SCALE), 
-and added to _const(POST_COLOR_MATRIX_c_BIAS), if enabled.  See 
-_cmnd(PixelTransfer).
-.TP
-5. Color component replacement by the color table specified for
-_const(POST_COLOR_MATRIX_COLOR_TABLE), if enabled.  See
-_cmnd(ColorTable).
-.SH ERRORS
-_const(INVALID_ENUM) is generated if __target is not _const(TEXTURE_3D)
-or _const(PROXY_TEXTURE_3D).
-.P
-_const(INVALID_ENUM) is generated if __format is not an accepted
-format constant.
-Format constants other than _const(STENCIL_INDEX) and _const(DEPTH_COMPONENT)
-are accepted.
-.P
-_const(INVALID_ENUM) is generated if __type is not a type constant.
-.P
-_const(INVALID_ENUM) is generated if __type is _const(BITMAP) and
-__format is not _const(COLOR_INDEX).
-.P
-_const(INVALID_VALUE) is generated if __level is less than 0.
-.P 
-.P 
-_const(INVALID_VALUE) may be generated if __level is greater than $log
-sub 2$\f2max\fP,
-where \f2max\fP is the returned value of _const(MAX_TEXTURE_SIZE).
-.P
-_const(INVALID_VALUE) is generated if __internalformat is not 1, 2, 3, 4, or one of the 
-accepted resolution and format symbolic constants.
-.P
-_const(INVALID_VALUE) is generated if __width, __height, or __depth
-is less than 0 or greater than 2 + _const(MAX_TEXTURE_SIZE),
-or if either cannot be represented as $2 sup k ~+~ 2( __eqnborder )$ for some
-integer value of \f2k\fP.
-.P
-_const(INVALID_VALUE) is generated if __border is not 0 or 1.
-.P
-_const(INVALID_OPERATION) is generated if _cmnd
-is executed between the execution of _cmnd(Begin)
-and the corresponding execution of _cmnd(End).
-.P
-_const(INVALID_OPERATION) is generated if _param9 is one of
-_const(UNSIGNED_BYTE_3_3_2),
-_const(UNSIGNED_BYTE_2_3_3_REV),
-_const(UNSIGNED_SHORT_5_6_5), or
-_const(UNSIGNED_SHORT_5_6_5_REV)
-and _param8 is not _const(RGB).
-.P
-_const(INVALID_OPERATION) is generated if _param9 is one of
-_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)
-and _param8 is neither _const(RGBA) nor _const(BGRA).
-.SH ASSOCIATED GETS
-_cmnd(GetTexImage)
-.br
-_cmnd(IsEnabled) with argument _const(TEXTURE_3D)
-.SH SEE ALSO
-_cmnd(ActiveTextureARB),
-_cmnd(CopyPixels),
-_cmnd(CopyTexImage1D),
-_cmnd(CopyTexImage2D),
-_cmnd(CopyTexSubImage1D),
-_cmnd(CopyTexSubImage2D),
-_cmnd(CopyTexSubImage3D),
-_cmnd(DrawPixels),
-_cmnd(PixelStore),
-_cmnd(PixelTransfer),
-_cmnd(TexEnv),
-_cmnd(TexGen),
-_cmnd(TexImage1D),
-_cmnd(TexImage2D),
-_cmnd(TexSubImage1D),
-_cmnd(TexSubImage2D),
-_cmnd(TexSubImage3D),
-_cmnd(TexParameter)
-
-