What is unextended OpenGL?

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What does unextended OpenGL mean. Does it refer to the non-programmable/Fixed pipeline version without any extensions? Why is it "unextended".

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It just refers to OpenGL without extensions or, depending on context, without any extensions relevant to the discussion.

For example, in the GL_KHR_blend_equation_advanced specification you were reading, "the standard blend modes provided by unextended OpenGL" just means the modes OpenGL offers by default. It uses "unextended" for clarity, to qualify that it is referring to OpenGL's set of blend modes not just without GL_KHR_blend_equation_advanced, but also without any other extensions that might add more advanced blend modes as well.