glBlendColor(3G)

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 GL_ARB_imaging subset. glBlendColor is
     present only if GL_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


SEE ALSO
     glBlendEquation, glBlendFunc, glGetString