- set the current color
C SPECIFICATION
PARAMETERS
_param1, _param2, _param3
Specify new red, green, and blue
values for the current color.
_param4 Specifies a new alpha value for
the current color. Included only
in the four-argument glColor4
commands.
C SPECIFICATION
PARAMETERS
_param1
Specifies a pointer to an array that contains red,
green, blue, and (sometimes) alpha values.
DESCRIPTION
The GL stores both a current single-valued color index and
a current four-valued RGBA color. glColor sets a new
four-valued RGBA color. glColor has two major variants:
glColor3 and glColor4. glColor3 variants specify new red,
green, and blue values explicitly and set the current
alpha value to 1.0 (full intensity) implicitly. glColor4
variants specify all four color components explicitly.
glColor3b, glColor4b, glColor3s, glColor4s, glColor3i, and
glColor4i take three or four signed byte, short, or long
integers as arguments. When v is appended to the name,
the color commands can take a pointer to an array of such
values.
Current color values are stored in floating-point , 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.
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.
1