glblendcolorext(3G) — IRIX 6.5.3f



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



NAME
     glBlendColorEXT - set the blend color


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


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


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

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

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

ASSOCIATED GETS
     glGet with an argument of GLBLENDCOLOREXT.


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


SEE ALSO
     glBlendFunc, glGetString.











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