glColor4bv function

Sets the current color from an already existing array of color values.

Syntax

void WINAPI glColor4bv(
   const GLbyte *v
);

Parameters

v

A pointer to an array that contains red, green, blue, and alpha values.

Return value

This function does not return a value.

Remarks

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 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.

Requirements

See also

glBegin

glEnd

glGetBooleanv, glGetDoublev, glGetFloatv, glGetIntegerv

glIndex