[Top]
GL
|
Method GL.glColor()
- Method
glColor
void glColor(float|int red, float|int green, float|int blue, float|int|void alpha)
void glColor(array(float|int) rgb)
- Description
The GL stores both a current single-valued color index
and a current four-valued RGBA color. If no alpha value has been give, 1.0 (full intensity)
is implied.
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.
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.
- Parameter red
Specify new red, green, and blue values for the current color.
- Parameter alpha
Specifies a new alpha value for the current color.
|