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OpenGL – a set of rules for building simple and complex flat images or 3D scenes. Usually implemented by video card developers and used in computer games and simply in programs that use computer graphics.
Unlike DirectX, OpenGL is not tied to one family of operating systems, that is, games using OpenGL can run on different operating systems of the family Linux, Windows and some others.
Most Harry Potter games can use both DirectX and OpenGL to run. To do this, you usually need to start the game from the command line with a certain parameter.
Official site: go.
Reminds me of this amazing technology: АlехeyMS