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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(Color, set the current color)
_names(Color,[34]u*[bsifd])
.EQ
delim $$
.EN
.SH PARAMETERS
_phead(_param1 _param2 _param3)
Specify new red, green, and blue values for the current color.
_phead(_param4)
Specifies a new alpha value for the current color.
Included only in the four-argument _cmnd(Color4) commands.
_names(Color,[34]u*[bsifd]v)
.SH PARAMETERS
_phead(_param1)
Specifies a pointer to an array that contains red, green, blue,
and (sometimes) alpha values.
.SH DESCRIPTION
The GL stores both a current single-valued color index
and a current four-valued RGBA color.
_cmnd sets a new four-valued RGBA color.
_cmnd has two major variants:
_cmnd(Color3) and _cmnd(Color4).
_cmnd(Color3) variants specify new red,
green,
and blue values explicitly
and set the current alpha value to 1.0 (full intensity) implicitly.
_cmnd(Color4) variants specify all four color components explicitly.
.P
_cmnd(Color3b), _cmnd(Color4b),
_cmnd(Color3s), _cmnd(Color4s), _cmnd(Color3i), and _cmnd(Color4i) take
three or four signed byte, short, or long integers as arguments.
When \f3v\fP is appended to the name,
the color commands can take a pointer to an array of such values.
.P
Current color values are stored in floating-point format,
with unspecified mantissa and exponent sizes.
Unsigned integer color components,
when specified,
are linearly mapped to floating-point values such that the largest
representable value maps to 1.0 (full intensity),
and 0 maps to 0.0 (zero intensity).
Signed integer color components,
when specified,
are linearly mapped to floating-point values such that the most positive
representable value maps to 1.0,
and the most negative representable value maps to \-1.0. (Note that
this mapping does not convert 0 precisely to 0.0.)
Floating-point values are mapped directly.
.P
Neither floating-point nor signed integer values are clamped
to the range [0,1] before the current color is updated.
However,
color components are clamped to this range before they are interpolated
or written into a color buffer.
.SH NOTES
The initial value for the current color is (1, 1, 1, 1).
.P
The current color can be updated at any time.
In particular,
_cmnd can be called between a call to _cmnd(Begin) and the corresponding
call to _cmnd(End).
.SH ASSOCIATED GETS
_cmnd(Get) with argument _const(CURRENT_COLOR)
.br
_cmnd(Get) with argument _const(RGBA_MODE)
.SH SEE ALSO
_cmnd(Index)
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