glBlendColorEXT(3G)	       OpenGL Reference		   glBlendColorEXT(3G)

NAME    [Toc]    [Back]

     glBlendColorEXT - set the blend color

C SPECIFICATION    [Toc]    [Back]

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

PARAMETERS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     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    [Toc]    [Back]

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

ASSOCIATED GETS    [Toc]    [Back]

     glGet with	an argument of GL_BLEND_COLOR_EXT.


MACHINE	DEPENDENCIES
     RealityEngine, RealityEngine2, and	VTX systems do not support the use of
     source blend factor GL_SRC_ALPHA_SATURATE and a destination factor	based
     on	the constant blend color (GL_.._CONSTANT_.._EXT); such combinations
     produce incorrect results.

SEE ALSO    [Toc]    [Back]

     glBlendFunc, glGetString.


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