NAME
	  fglBlendColorEXT - set the blend color


     FORTRAN SPECIFICATION
	  SUBROUTINE fglBlendColorEXT( REAL*4 red,
				       REAL*4 green,
				       REAL*4 blue,
				       REAL*4 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	fglBlendFunc for a
	  complete description of the blending operations.  Initially
	  the GL_BLEND_COLOR_EXT is set	to (0,0,0,0).

     NOTES
	  fglBlendColorEXT is part of the _extname(EXT_blend_color)
	  extension, not part of the core GL command set.  If
	  _extstring(EXT_blend_color) is included in the string
	  returned by fglGetString, when called	with argument
	  GL_EXTENSIONS, extension _extname(EXT_blend_color) is
	  supported by the connection.

     ERRORS
	  GL_INVALID_OPERATION is generated if fglBlendColorEXT	is
	  executed between the execution of fglBegin and the
	  corresponding	execution of fglEnd.

     ASSOCIATED	GETS
	  fglGet with an argument of GL_BLEND_COLOR_EXT.

     SEE ALSO
	  fglBlendFunc,	fglGetString.