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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)_C_
_header(Minmax,define minmax table)
_names(Minmax)
_define(@<__target>@,@<_param1>@)_C_
_define(@<__internalformat>@,@<_param2>@)_C_
_define(@<__sink>@,@<_param3>@)_C_
.SH PARAMETERS
_phead(__target)
The minmax table whose parameters are to be set.
Must be
_const(MINMAX).
_phead(__internalformat)
The format of entries in the minmax 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 minmax
process and no drawing or texture loading will take place.
If _const(FALSE), pixels will proceed to the final conversion process after
minmax.
.SH DESCRIPTION
When _const(MINMAX) is enabled, the RGBA components of incoming pixels are
compared to the minimum and maximum values for each component, which are
stored in the 2-element minmax table.
(The first element stores the minima, and the second element stores
the maxima.)
If a pixel component is greater than the corresponding component
in the maximum element, then the maximum element is updated with the
pixel component value.
If a pixel component is less than the corresponding component in
the minimum element, then the minimum element is updated with the
pixel component value.
(In both cases, if the internal format of the minmax table includes
luminance, then the R color component of incoming pixels is used
for comparison.)
The contents of the minmax table may be retrieved at a later time
by calling _cmnd(GetMinmax).
The minmax operation is enabled or disabled by calling _cmnd(Enable) or
_cmnd(Disable), respectively, with an argument of _const(MINMAX).
.P
_cmnd redefines the current minmax table to have entries of the format
specified by __internalformat.
The maximum element is initialized with the smallest possible component
values, and the minimum element is initialized with the largest possible
component values.
The values in the previous minmax table, if any, are lost.
If __sink is _const(TRUE), then pixels are discarded after minmax;
no further processing of the pixels takes place, and no drawing,
texture loading, or pixel readback will result.
.P
.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_ENUM) is generated if __internalformat is not one of the
allowable values.
.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(GetMinmaxParameter)
.SH SEE ALSO
_cmnd(GetMinmax),
_cmnd(ResetMinmax)
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