Gl.Coloriv (gb.opengl)
Set the current color.
Parameters
- red, green, blue
-
Specify new red, green, and blue values for the current color.
- alpha
-
Specifies a new alpha value for the current color.
Included only in the four-argument Gl.Color4 commands.
Parameters
- v
-
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.
Gl.Color sets a new four-valued RGBA color.
Gl.Color has two major variants:
Gl.Color3 and
Gl.Color4.
Gl.Color3 variants specify new red,
green,
and blue values explicitly
and set the current alpha value to 1.0 (full intensity) implicitly.
Gl.Color4 variants specify all four color components explicitly.
Gl.Color3b,
Gl.Color4b,
Gl.Color3s,
Gl.Color4s,
Gl.Color3i, and
Gl.Color4i 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 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
.
(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
before the current color is updated.
However,
color components are clamped to this range before they are interpolated
or written into a color buffer.
Notes
The initial value for the current color is (1, 1, 1, 1).
The current color can be updated at any time.
In particular,
Gl.Color can be called between a call to
Gl.Begin and the corresponding
call to
Gl.End.
Associated Gets
Gl.Get with argument Gl.CURRENT_COLOR
Gl.Get with argument Gl.RGBA_MODE
See also
Gl.ColorPointer,
Gl.Index,
Gl.SecondaryColor
See original documentation on OpenGL website