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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,tbl|eqn)_C_
-_C_      eqn is automatically replaced with neqn for nroff
-_header(Accum,operate on the accumulation buffer)
-_names(Accum)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the accumulation buffer operation.
-Symbolic constants
-_const(ACCUM),
-_const(LOAD),
-_const(ADD),
-_const(MULT),
-and
-_const(RETURN) are accepted.
-_phead(_param2)
-Specifies a floating-point value used in the accumulation buffer operation.
-_param1 determines how _param2 is used.
-.SH DESCRIPTION
-The accumulation buffer is an extended-range color buffer.
-Images are not rendered into it.
-Rather,
-images rendered into one of the color buffers
-are added to the contents of the accumulation buffer after rendering.
-Effects such as antialiasing (of points, lines, and polygons),
-motion blur,
-and depth of field can be created
-by accumulating images generated with different transformation matrices.
-.P
-Each pixel in the accumulation buffer consists of
-red, green, blue, and alpha values.
-The number of bits per component in the accumulation buffer
-depends on the implementation. You can examine this number
-by calling _cmnd(GetIntegerv) four times,
-with arguments _const(ACCUM_RED_BITS),
-_const(ACCUM_GREEN_BITS),
-_const(ACCUM_BLUE_BITS),
-and _const(ACCUM_ALPHA_BITS).
-Regardless of the number of bits per component,
-the range of values stored by each component is [\-1,\ 1].
-The accumulation buffer pixels are mapped one-to-one with frame buffer pixels.
-.P
-_cmnd operates on the accumulation buffer.
-The first argument, _param1,
-is a symbolic constant that selects an accumulation buffer operation.
-The second argument, _param2,
-is a floating-point value to be used in that operation.
-Five operations are specified:
-_const(ACCUM), _const(LOAD), _const(ADD),
-_const(MULT), and _const(RETURN).
-.P
-All accumulation buffer operations are limited
-to the area of the current scissor box and applied identically to
-the red, green, blue, and alpha components of each pixel.
-If a _cmnd operation results in a value outside the range [\-1,\ 1], 
-the contents of an accumulation buffer pixel component are undefined.
-.P
-The operations are as follows:
-.TP 14
-_const(ACCUM)
-Obtains R, G, B, and A values
-from the buffer currently selected for reading (see _cmnd(ReadBuffer)).
-Each component value is divided by $2 sup n^-^1$,
-where $n$ is the number of bits allocated to each color component
-in the currently selected buffer.
-The result is a floating-point value in the range [0,\ 1],
-which is multiplied by _param2 and added to the corresponding pixel component
-in the accumulation buffer,
-thereby updating the accumulation buffer.
-.TP
-_const(LOAD) 
-Similar to _const(ACCUM),
-except that the current value in the accumulation buffer is not used
-in the calculation of the new value.
-That is, the R, G, B, and A values from the currently selected buffer
-are divided by $2 sup n^-^1$,
-multiplied by _param2,
-and then stored in the corresponding accumulation buffer cell,
-overwriting the current value.
-.TP
-_const(ADD) 
-Adds _param2 to each R, G, B, and A
-in the accumulation buffer. 
-.TP
-_const(MULT) 
-Multiplies each R, G, B, and A
-in the accumulation buffer by _param2 and returns the scaled component
-to its corresponding accumulation buffer location.
-.TP
-_const(RETURN) 
-Transfers accumulation buffer values
-to the color buffer or buffers currently selected for writing.
-Each R, G, B, and A component is multiplied by _param2,
-then multiplied by $2 sup n^-^1$,
-clamped to the range [0,$~2 sup n^-^1 $], and stored
-in the corresponding display buffer cell.
-The only fragment operations that are applied to this transfer are
-pixel ownership,
-scissor,
-dithering,
-and color writemasks.
-.P
-To clear the accumulation buffer, call _cmnd(ClearAccum) with R, G, B,
-and A values to set it to, then call _cmnd(Clear) with the
-accumulation buffer enabled. 
-.SH NOTES
-Only pixels within the current scissor box are updated by a
-_cmnd operation.
-.SH ERRORS
-_const(INVALID_ENUM) is generated if _param1 is not an accepted value.
-.P
-_const(INVALID_OPERATION) is generated if there is no accumulation buffer.
-.P
-_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(ACCUM_RED_BITS)
-.br
-_cmnd(Get) with argument _const(ACCUM_GREEN_BITS)
-.br
-_cmnd(Get) with argument _const(ACCUM_BLUE_BITS)
-.br
-_cmnd(Get) with argument _const(ACCUM_ALPHA_BITS)
-.SH SEE ALSO
-_cmnd(Clear),
-_cmnd(ClearAccum),
-_cmnd(CopyPixels),
-_cmnd(DrawBuffer),
-_cmnd(Get),
-_cmnd(ReadBuffer), 
-_cmnd(ReadPixels),
-_cmnd(Scissor),
-_cmnd(StencilOp)