glBlendColor

Name

glBlendColor — set the blend color

C Specification

void glBlendColor (GLclampf  red,
                   GLclampf  green,
                   GLclampf  blue,
                   GLclampf  alpha);

Parameters

red, green, blue, alpha: specify the components of GL_BLEND_COLOR

Description

The GL_BLEND_COLOR may be used to calculate the source and destination blending factors. The color components are clamped to the range [0, 1] before being stored. See glBlendFunc for a complete description of the blending operations. Initially the GL_BLEND_COLOR is set to (0, 0, 0, 0).

Notes

glBlendColor is part of the ARB_imaging subset. glBlendColor is present only if ARB_imaging is returned when glGetString is called with GL_EXTENSIONS as its argument.

Errors

GL_INVALID_OPERATION is generated if glBlendColor is executed between the execution of glBegin and the corresponding execution of glEnd.

Associated Gets

glGet with an argument of GL_BLEND_COLOR