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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|tbl)_C_
-_header(PushAttrib,push and pop the server attribute stack)
-_names(PushAttrib)
-.SH PARAMETERS
-_phead(_param1)
-Specifies a mask that indicates which attributes to save. Values for
-_param1 are listed below.
-_names(PopAttrib)
-.SH DESCRIPTION
-_cmnd takes one argument,
-a mask that indicates which groups of state variables
-to save on the attribute stack.
-Symbolic constants are used to set bits in the mask.
-_param1(1)
-is typically constructed by ORing several of these constants together.
-The special mask
-_const(ALL_ATTRIB_BITS)
-can be used to save all stackable states.
-.P
-The symbolic mask constants and their associated GL state are as follows
-(the second column lists which attributes are saved):
-.P
-.TS
-;
-l l .
-_const(ACCUM_BUFFER_BIT)	Accumulation buffer clear value
-
-_const(COLOR_BUFFER_BIT)	_const(ALPHA_TEST) enable bit
-	Alpha test function and reference value
-	_const(BLEND) enable bit
-	Blending source and destination functions
-	Constant blend color
-	Blending equation
-	_const(DITHER) enable bit
-	_const(DRAW_BUFFER) setting
-	_const(COLOR_LOGIC_OP) enable bit
-	_const(INDEX_LOGIC_OP) enable bit
-	Logic op function
-	Color mode and index mode clear values
-	Color mode and index mode writemasks
-
-_const(CURRENT_BIT)	Current RGBA color
-	Current color index
-	Current normal vector
-	Current texture coordinates
-	Current raster position
-	_const(CURRENT_RASTER_POSITION_VALID) flag
-	RGBA color associated with current raster position
-	Color index associated with current raster position
-	Texture coordinates associated with current raster position
-	_const(EDGE_FLAG) flag
-
-_const(DEPTH_BUFFER_BIT)	_const(DEPTH_TEST) enable bit
-	Depth buffer test function
-	Depth buffer clear value
-	_const(DEPTH_WRITEMASK) enable bit
-
-_const(ENABLE_BIT)	_const(ALPHA_TEST) flag
-	_const(AUTO_NORMAL) flag
-	_const(BLEND) flag
-	Enable bits for the user-definable clipping planes
-	_const(COLOR_MATERIAL)
-	_const(CULL_FACE) flag
-	_const(DEPTH_TEST) flag
-	_const(DITHER) flag
-	_const(FOG) flag
-	_const(LIGHT)\f2i\fP where 0\ <= \f2i\fP<_const(MAX_LIGHTS)
-	_const(LIGHTING) flag
-	_const(LINE_SMOOTH) flag
-	_const(LINE_STIPPLE) flag
-	_const(COLOR_LOGIC_OP) flag
-	_const(INDEX_LOGIC_OP) flag
-	_const(MAP1_)\f2x\fP where \f2x\fP is a map type
-	_const(MAP2_)\f2x\fP where \f2x\fP is a map type
-	_const(NORMALIZE) flag
-	_const(POINT_SMOOTH) flag
-	_const(POLYGON_OFFSET_LINE) flag
-	_const(POLYGON_OFFSET_FILL) flag
-	_const(POLYGON_OFFSET_POINT) flag
-	_const(POLYGON_SMOOTH) flag
-	_const(POLYGON_STIPPLE) flag
-	_const(SCISSOR_TEST) flag
-	_const(STENCIL_TEST) flag
-	_const(TEXTURE_1D) flag
-	_const(TEXTURE_2D) flag
-	_const(TEXTURE_3D) flag
-	Flags _const(TEXTURE_GEN_)\f2x\fP where \f2x\fP is S, T, R, or Q 
-
-_const(EVAL_BIT)	_const(MAP1_)\f2x\fP enable bits, where \f2x\fP is a map type
-	_const(MAP2_)\f2x\fP enable bits, where \f2x\fP is a map type
-	1D grid endpoints and divisions
-	2D grid endpoints and divisions
-	_const(AUTO_NORMAL) enable bit
-
-_const(FOG_BIT)	_const(FOG) enable bit
-	Fog color
-	Fog density
-	Linear fog start
-	Linear fog end
-	Fog index
-	_const(FOG_MODE) value
-
-_const(HINT_BIT)	_const(PERSPECTIVE_CORRECTION_HINT) setting
-	_const(POINT_SMOOTH_HINT) setting
-	_const(LINE_SMOOTH_HINT) setting
-	_const(POLYGON_SMOOTH_HINT) setting
-	_const(FOG_HINT) setting
-
-_const(LIGHTING_BIT)	_const(COLOR_MATERIAL) enable bit
-	_const(COLOR_MATERIAL_FACE) value
-	Color material parameters that are tracking the current color
-	Ambient scene color
-	_const(LIGHT_MODEL_LOCAL_VIEWER) value
-	_const(LIGHT_MODEL_TWO_SIDE) setting
-	_const(LIGHTING) enable bit
-	Enable bit for each light
-	Ambient, diffuse, and specular intensity for each light
-	Direction, position, exponent, and cutoff angle for each light
-	Constant, linear, and quadratic attenuation factors for each light
-	Ambient, diffuse, specular, and emissive color for each material
-	Ambient, diffuse, and specular color indices for each material
-	Specular exponent for each material
-	_const(SHADE_MODEL) setting
-
-_const(LINE_BIT)	_const(LINE_SMOOTH) flag
-	_const(LINE_STIPPLE) enable bit
-	Line stipple pattern and repeat counter
-	Line width
-
-_const(LIST_BIT)	_const(LIST_BASE) setting
-
-_const(PIXEL_MODE_BIT)	_const(RED_BIAS) and _const(RED_SCALE) settings
-	_const(GREEN_BIAS) and _const(GREEN_SCALE) values
-	_const(BLUE_BIAS) and _const(BLUE_SCALE)
-	_const(ALPHA_BIAS) and _const(ALPHA_SCALE)
-	_const(DEPTH_BIAS) and _const(DEPTH_SCALE)
-	_const(INDEX_OFFSET) and _const(INDEX_SHIFT) values
-	_const(MAP_COLOR) and _const(MAP_STENCIL) flags
-	_const(ZOOM_X) and _const(ZOOM_Y) factors
-	_const(READ_BUFFER) setting
-
-_const(POINT_BIT)	_const(POINT_SMOOTH) flag
-	Point size
-
-_const(POLYGON_BIT)	_const(CULL_FACE) enable bit
-	_const(CULL_FACE_MODE) value
-	_const(FRONT_FACE) indicator
-	_const(POLYGON_MODE) setting
-	_const(POLYGON_SMOOTH) flag
-	_const(POLYGON_STIPPLE) enable bit
-	_const(POLYGON_OFFSET_FILL) flag
-	_const(POLYGON_OFFSET_LINE) flag
-	_const(POLYGON_OFFSET_POINT) flag
-	_const(POLYGON_OFFSET_FACTOR)
-	_const(POLYGON_OFFSET_UNITS)
-
-_const(POLYGON_STIPPLE_BIT)	Polygon stipple image
-
-_const(SCISSOR_BIT)	_const(SCISSOR_TEST) flag
-	Scissor box
-
-_const(STENCIL_BUFFER_BIT)	_const(STENCIL_TEST) enable bit
-	Stencil function and reference value
-	Stencil value mask
-	Stencil fail, pass, and depth buffer pass actions
-	Stencil buffer clear value
-	Stencil buffer writemask
-
-_const(TEXTURE_BIT)	Enable bits for the four texture coordinates
-	Border color for each texture image
-	Minification function for each texture image
-	Magnification function for each texture image
-	Texture coordinates and wrap mode for each texture image
-	Color and mode for each texture environment
-	Enable bits _const(TEXTURE_GEN_)\f2x\fP, \f2x\fP is S, T, R, and Q 
-	_const(TEXTURE_GEN_MODE) setting for S, T, R, and Q
-	_cmnd(TexGen) plane equations for S, T, R, and Q
-	Current texture bindings (for example, _const(TEXTURE_BINDING_2D))
-
-_const(TRANSFORM_BIT)	Coefficients of the six clipping planes
-	Enable bits for the user-definable clipping planes
-	_const(MATRIX_MODE) value
-	_const(NORMALIZE) flag
-	_const(RESCALE_NORMAL) flag
-
-_const(VIEWPORT_BIT)	Depth range (near and far)
-	Viewport origin and extent
-.TE
-.P
-_cmnd(PopAttrib) restores the values of the state variables saved with the last
-.br
-_cmnd(PushAttrib) command.
-Those not saved are left unchanged.
-.P
-It is an error to push attributes onto a full stack,
-or to pop attributes off an empty stack.
-In either case, the error flag is set
-and no other change is made to GL state.
-.P
-Initially, the attribute stack is empty.
-.SH NOTES
-Not all values for GL state can be saved on the attribute stack.
-For example,
-render mode state,
-and select and feedback state cannot be saved.
-Client state must be saved with 
-_cmnd(PushClientAttrib).
-.P
-The depth of the attribute stack depends on the implementation,
-but it must be at least 16.
-.P
-When the _arbstring(multitexture) extension is supported, pushing and
-popping texture state applies to all supported texture units.
-.SH ERRORS
-_const(STACK_OVERFLOW) is generated if _cmnd(PushAttrib) is called while
-the attribute stack is full.
-.P
-_const(STACK_UNDERFLOW) is generated if _cmnd(PopAttrib) is called while
-the attribute stack is empty.
-.P
-_const(INVALID_OPERATION) is generated if _cmnd(PushAttrib) or _cmnd(PopAttrib)
-is executed between the execution of _cmnd(Begin)
-and the corresponding execution of _cmnd(End).
-.SH ASSOCIATED GETS 
-_cmnd(Get) with argument _const(ATTRIB_STACK_DEPTH)
-.br
-_cmnd(Get) with argument _const(MAX_ATTRIB_STACK_DEPTH)
-.SH SEE ALSO
-_cmnd(Get),
-_cmnd(GetClipPlane),
-_cmnd(GetError),
-_cmnd(GetLight),
-_cmnd(GetMap),
-_cmnd(GetMaterial),
-.br
-_cmnd(GetPixelMap),
-_cmnd(GetPolygonStipple),
-_cmnd(GetString),
-_cmnd(GetTexEnv),
-_cmnd(GetTexGen),
-_cmnd(GetTexImage),
-_cmnd(GetTexLevelParameter),
-_cmnd(GetTexParameter),
-_cmnd(IsEnabled),
-_cmnd(PushClientAttrib)