glBlendColor - set the blend color

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

red, green, blue, alpha

specify the components of GL_BLEND_COLOR

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).

glGet() with an argument of GL_BLEND_COLOR

glBlendEquation(), glBlendFunc(), glGetString()

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03/08/2011 OpenGL 3.3