NAME
	  glBlendColorEXT - set	the blend color


     C SPECIFICATION
	  void glBlendColorEXT(	GLclampf red,
				GLclampf green,
				GLclampf blue,
				GLclampf alpha )


     PARAMETERS
     GL_BLEND_COLOR_EXT
	  red, green, blue, alpha specify the components of


     DESCRIPTION
	  The GL_BLEND_COLOR_EXT may be	used to	calculate the source
	  and destination blending factors. See	glBlendFunc for	a
	  complete description of the blending operations.  Initially
	  the GL_BLEND_COLOR_EXT is set	to (0,0,0,0).

     NOTES
	  glBlendColorEXT is part of the EXT_blend_color extension,
	  not part of the core GL command set.	If GL_EXT_blend_color
	  is included in the string returned by	glGetString, when
	  called with argument GL_EXTENSIONS, extension
	  EXT_blend_color is supported by the connection.

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

     ASSOCIATED	GETS
	  glGet	with an	argument of GL_BLEND_COLOR_EXT.

     SEE ALSO
	  glBlendFunc, glGetString.