_C_ License Applicability. Except to the extent portions of this file are
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_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
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_C_ 
_C_ http://oss.sgi.com/projects/FreeB
_C_ 
_C_ Note that, as provided in the License, the Software is distributed on an
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_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(GetColorTable,retrieve contents of a color lookup table)
_names(GetColorTable)
_define(@<__target>@,@<_param1>@)_C_
_define(@<__format>@,@<_param2>@)_C_
_define(@<__type>@,@<_param3>@)_C_
_define(@<__table>@,@<_param4>@)_C_
.SH PARAMETERS
_phead(__target)
Must be _const(COLOR_TABLE),
_const(POST_CONVOLUTION_COLOR_TABLE),
or
_const(POST_COLOR_MATRIX_COLOR_TABLE).
_phead(__format)
The format of the pixel data in __table.
The possible values are
_const(RED),
_const(GREEN),
_const(BLUE),
_const(ALPHA),
_const(LUMINANCE),
_const(LUMINANCE_ALPHA),
_const(RGB),
_const(BGR),
_const(RGBA), and
_const(BGRA).
_phead(__type)
The type of the pixel data in __table.
Symbolic constants
_const(UNSIGNED_BYTE),
_const(BYTE),
_const(BITMAP),
_const(UNSIGNED_SHORT),
_const(SHORT),
_const(UNSIGNED_INT),
_const(INT),
_const(FLOAT),
_const(UNSIGNED_BYTE_3_3_2),
_const(UNSIGNED_BYTE_2_3_3_REV),
_const(UNSIGNED_SHORT_5_6_5),
_const(UNSIGNED_SHORT_5_6_5_REV),
_const(UNSIGNED_SHORT_4_4_4_4),
_const(UNSIGNED_SHORT_4_4_4_4_REV),
_const(UNSIGNED_SHORT_5_5_5_1),
_const(UNSIGNED_SHORT_1_5_5_5_REV),
_const(UNSIGNED_INT_8_8_8_8),
_const(UNSIGNED_INT_8_8_8_8_REV),
_const(UNSIGNED_INT_10_10_10_2), and
_const(UNSIGNED_INT_2_10_10_10_REV)
are accepted.
_phead(__table)
Pointer to a one-dimensional array of pixel data containing the contents
of the color table.
.SH DESCRIPTION
_cmnd returns in __table the contents of the color table specified 
by __target. No pixel transfer operations are performed, but pixel 
storage modes that are applicable to
_cmnd(ReadPixels) are performed. 
.P
Color components that are requested in
the specified __format, but which are not included in the internal
format of the color lookup table, are returned as zero.  The
assignments of internal color components to the components
requested by __format are
.P
.TS
center;
lb lb
l l.
_
Internal Component	Resulting Component
_
red	red
green	green
blue	blue
alpha	alpha
luminance	red
intensity	red
_
.TE

.P
.SH NOTES
_cmnd is present only if _arbstring(imaging) is returned when _cmnd(GetString)
is called with an argument of _const(EXTENSIONS).
.P
.SH ERRORS
_const(INVALID_ENUM) is generated if __target is not one of the allowable
values.
.P
_const(INVALID_ENUM) is generated if __format is not one of the allowable
values.
.P
_const(INVALID_ENUM) is generated if __type is not one of the allowable
values.
.P
_const(INVALID_OPERATION) is generated if __type is one of
_const(UNSIGNED_BYTE_3_3_2),
_const(UNSIGNED_BYTE_2_3_3_REV),
_const(UNSIGNED_SHORT_5_6_5), or
_const(UNSIGNED_SHORT_5_6_5_REV)
and __format is not _const(RGB).
.P
_const(INVALID_OPERATION) is generated if __type is one of
_const(UNSIGNED_SHORT_4_4_4_4),
_const(UNSIGNED_SHORT_4_4_4_4_REV),
_const(UNSIGNED_SHORT_5_5_5_1),
_const(UNSIGNED_SHORT_1_5_5_5_REV),
_const(UNSIGNED_INT_8_8_8_8),
_const(UNSIGNED_INT_8_8_8_8_REV),
_const(UNSIGNED_INT_10_10_10_2), or
_const(UNSIGNED_INT_2_10_10_10_REV)
and __format is neither _const(RGBA) nor _const(BGRA).
.P
_const(INVALID_OPERATION) is generated if _cmnd is executed
between the execution of _cmnd(Begin) and the corresponding
execution of _cmnd(End).
.SH SEE ALSO
_cmnd(ColorTable),
_cmnd(ColorTableParameter),
_cmnd(GetColorTableParameter)
