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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(RasterPos,specify the raster position for pixel operations)
-_names(RasterPos,[2-4][sifd])
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1 _param2 _param3 _param4)
-Specify the $x$, $y$, $z$, and $w$ object coordinates
-(if present)
-for the raster position.
-_names(RasterPos,[2-4][sifd]v)
-.SH PARAMETERS
-_phead(_param1)
-Specifies a pointer to an array of two,
-three,
-or four elements,
-specifying $x$, $y$, $z$, and $w$ coordinates, respectively.
-.SH DESCRIPTION
-The GL maintains a 3D position in window coordinates.
-This position,
-called the raster position,
-is used to position pixel and bitmap write operations. It is
-maintained with subpixel accuracy.
-See _cmnd(Bitmap), _cmnd(DrawPixels), and _cmnd(CopyPixels).
-.P
-The current raster position consists of three window coordinates
-($x$, $y$, $z$),
-a clip coordinate value ($w$),
-an eye coordinate distance,
-a valid bit,
-and associated color data and texture coordinates.
-The $w$ coordinate is a clip coordinate,
-because $w$ is not projected to window coordinates.
-_cmnd(RasterPos4) specifies object coordinates $x$, $y$, $z$, and $w$
-explicitly.
-_cmnd(RasterPos3) specifies object coordinate $x$, $y$, and $z$ explicitly,
-while $w$ is implicitly set to 1.
-_cmnd(RasterPos2) uses the argument values for $x$ and $y$ while
-implicitly setting $z$ and $w$ to 0 and 1.  
-.P
-The object coordinates presented by _cmnd are treated just like those
-of a _cmnd(Vertex) command:
-They are transformed by the current modelview and projection matrices
-and passed to the clipping stage.
-If the vertex is not culled,
-then it is projected and scaled to window coordinates,
-which become the new current raster position,
-and the _const(CURRENT_RASTER_POSITION_VALID) flag is set.
-If the vertex 
-.I is
-culled,
-then the valid bit is cleared and the current raster position
-and associated color and texture coordinates are undefined.
-.P
-The current raster position also includes some associated color data
-and texture coordinates.
-If lighting is enabled,
-then _const(CURRENT_RASTER_COLOR)
-(in RGBA mode)
-or _const(CURRENT_RASTER_INDEX)
-(in color index mode)
-is set to the color produced by the lighting calculation
-(see _cmnd(Light), _cmnd(LightModel), and 
-.br
-_cmnd(ShadeModel)).
-If lighting is disabled, 
-current color
-(in RGBA mode, state variable _const(CURRENT_COLOR))
-or color index
-(in color index mode, state variable _const(CURRENT_INDEX))
-is used to update the current raster color.
-.P
-Likewise,
-_const(CURRENT_RASTER_TEXTURE_COORDS) is updated as a function
-of _const(CURRENT_TEXTURE_COORDS),
-based on the texture matrix and the texture generation functions
-(see _cmnd(TexGen)).
-Finally,
-the distance from the origin of the eye coordinate system to the
-vertex as transformed by only the modelview matrix replaces
-_const(CURRENT_RASTER_DISTANCE).
-.P
-Initially, the current raster position is (0, 0, 0, 1),
-the current raster distance is 0,
-the valid bit is set,
-the associated RGBA color is (1, 1, 1, 1),
-the associated color index is 1,
-and the associated texture coordinates are (0, 0, 0, 1).
-In RGBA mode,
-_const(CURRENT_RASTER_INDEX) is always 1;
-in color index mode,
-the current raster RGBA color always maintains its initial value.
-.SH NOTES
-The raster position is modified both by _cmnd and by _cmnd(Bitmap). 
-.P
-When the raster position coordinates are invalid,
-drawing commands that are based on the raster position are
-ignored (that is, they do not result in changes to GL state).
-.P
-Calling _cmnd(DrawElements), or _cmnd(DrawRangeElements) may leave the
-current color or index indeterminate.
-If _cmnd is executed while the current color or index is indeterminate, the
-current raster color or current raster index remains indeterminate.
-.P
-To set a valid raster position outside the viewport, first set a valid
-raster position, then call _cmnd(Bitmap) with NULL as the \f2bitmap\fP
-parameter.
-.P
-When the _arbstring(imaging) extension is supported, there are distinct
-raster texture coordinates for each texture unit. Each texture unit's
-current ratster texture coordinates are updated by _cmnd.
-.SH ERRORS
-_const(INVALID_OPERATION) is generated if _cmnd
-is executed between the execution of _cmnd(Begin)
-and the corresponding execution of _cmnd(End).
-.SH ASSOCIATED GETS
-_cmnd(Get) with argument _const(CURRENT_RASTER_POSITION)
-.br
-_cmnd(Get) with argument _const(CURRENT_RASTER_POSITION_VALID)
-.br
-_cmnd(Get) with argument _const(CURRENT_RASTER_DISTANCE)
-.br
-_cmnd(Get) with argument _const(CURRENT_RASTER_COLOR)
-.br
-_cmnd(Get) with argument _const(CURRENT_RASTER_INDEX)
-.br
-_cmnd(Get) with argument _const(CURRENT_RASTER_TEXTURE_COORDS)
-.SH SEE ALSO
-_cmnd(Bitmap),
-_cmnd(CopyPixels),
-_cmnd(DrawArrays),
-_cmnd(DrawElements),
-_cmnd(DrawRangeElements),
-_cmnd(DrawPixels),
-_cmnd(TexCoord),
-_cmnd(TexGen),
-_cmnd(Vertex)