glBlendColor(3)

NAME

       glBlendColor - set the blend color

C SPECIFICATION

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

       delim $$

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(3G), glBlendFunc(3G), glGetString(3G)

                                                              GLBLENDCOLOR(3G)