fglBlendColorEXT(3G) OpenGL Reference fglBlendColorEXT(3G)NAMEfglBlendColorEXT - set the blend color
FORTRAN SPECIFICATION
SUBROUTINE fglBlendColorEXT( REAL*4 red,
REAL*4 green,
REAL*4 blue,
REAL*4 alpha )
PARAMETERS
red, green, blue, alpha specify the components of GL_BLEND_COLOR_EXT
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).
NOTESfglBlendColorEXT 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 fglGetString, when called with argument GL_EXTENSIONS,
extension 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.
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
fglBlendFunc, fglGetString.
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