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 GL_BLEND_COLOR_EXT
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.
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
glBlendFunc, glGetString.
Page 1
