glBlendColor — set the blend color
GL_BLEND_COLOR may be used to calculate the source and destination
blending factors. The color components are clamped to the range
before being stored. See glBlendFunc for a complete description of the
GL_BLEND_COLOR is set to (0, 0, 0, 0).
glBlendColor is part of the
glBlendColor is present only
ARB_imaging is returned when glGetString is called with
GL_EXTENSIONS as its argument.
glGet with an argument of
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