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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)