- set the blend color



C SPECIFICATION


PARAMETERS

       _param1, _param2, _param3, _param4
                                        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 argu-
       ment.


ERRORS

       GL_INVALID_OPERATION is generated if glBlendColor is  exe-
       cuted between the execution of glBegin and the correspond-
       ing execution of glEnd.



ASSOCIATED GETS

       glGet with an argument of GL_BLEND_COLOR


SEE ALSO

       glBlendEquation, glBlendFunc, glGetString



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