[all variants] OpenGl vs Propriety driver(not directX)

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http://ubuntuforums.org – Good day guys, I just need to clarify something. Ok for example i have setup my laptop with ubuntu 12.04 everything is running fine as tested. Grafx driver is also installed with close propriety driver. The question now is do i need to install opengl? as what i know opengl is the opposite of directx which is for microsoft driver to enchance gaming experience in windows, in ubuntu do i still need to install opengl library or software to enhance my gaming experience in linux regardless of my grafx card already have the latest driver accelerated software from its vendor that support linux? becaus (Hardware)