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).
The type of the
alpha parameters was changed from
GLclampf to GLfloat. This change is transparent to user code
and is described in detail on the
glGet with an argument of
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