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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_
-_header(Histogram,define histogram table)
-_names(Histogram)
-.EQ
-delim $$
-.EN
-_define(@<__target>@,@<_param1>@)_C_
-_define(@<__width>@,@<_param2>@)_C_
-_define(@<__internalformat>@,@<_param3>@)_C_
-_define(@<__sink>@,@<_param4>@)_C_
-.SH PARAMETERS
-_phead(__target)
-The histogram whose parameters are to be set.
-Must be one of
-_const(HISTOGRAM) or
-_const(PROXY_HISTOGRAM).
-_phead(__width)
-The number of entries in the histogram table.  Must be a power of 2.
-_phead(__internalformat)
-The format of entries in the histogram table.
-Must be one of
-_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(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(__sink)
-If _const(TRUE), pixels will be consumed by the histogramming
-process and no drawing or texture loading will take place.
-If _const(FALSE), pixels will proceed to the minmax process after
-histogramming.
-.SH DESCRIPTION
-When _const(HISTOGRAM) is enabled, RGBA color components are converted to
-histogram table indices by clamping to the range [0,1], multiplying by
-the width of the histogram table, and rounding to the nearest integer.
-The table entries selected by the RGBA indices are then incremented.
-(If the internal format of the histogram table includes luminance, then
-the index derived from the R color component determines the luminance
-table entry to be incremented.)  If a histogram table entry is incremented
-beyond its maximum value, then its value becomes undefined.  (This is
-not an error.)
-.PP
-Histogramming is performed only for RGBA pixels (though these may
-be specified originally as color indices and converted to RGBA by
-index table lookup).
-Histogramming is enabled with _cmnd(Enable) and disabled with _cmnd(Disable).
-.PP
-When __target is _const(HISTOGRAM), _cmnd redefines the current
-histogram table to have __width entries of the format specified by
-__internalformat.
-The entries are indexed 0 through $_eqnparam2 ~-~ 1$, and
-all entries are initialized to zero.
-The values in the previous histogram table, if any, are lost.
-If __sink is _const(TRUE), then pixels are discarded after histogramming;
-no further processing of the pixels takes place, and no drawing,
-texture loading, or pixel readback will result.
-.PP
-When __target is _const(PROXY_HISTOGRAM), _cmnd computes all
-state information as if the histogram table were to be redefined,
-but does not actually define the new table.
-If the requested histogram table is too large to be supported, then the
-state information will be set to zero.
-This provides a way to determine if a histogram table with the given
-parameters can be supported.
-.PP
-.SH NOTES
-_cmnd is present only if _arbstring(imaging) is returned when _cmnd(GetString)
-is called with an argument of _const(EXTENSIONS).
-.SH ERRORS
-_const(INVALID_ENUM) is generated if __target is not one of the allowable
-values.
-.P
-_const(INVALID_VALUE) is generated if __width is less than zero or is
-not a power of 2.
-.P
-_const(INVALID_ENUM) is generated if __internalformat is not one of the
-allowable values.
-.P
-_const(TABLE_TOO_LARGE) is generated if __target is _const(HISTOGRAM)
-and the histogram table specified is too large for the implementation.
-.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(GetHistogramParameter)
-.SH SEE ALSO
-_cmnd(GetHistogram),
-_cmnd(ResetHistogram)