Note that most users have DirectX 9-compatible hardware, which is roughly feature-equivalent to OpenGL 2.0. When considering what hardware is available to your users, the Steam hardware Survey may help. Closed-source "binary blobs" will generally support the highest OpenGL version for the hardware, including up to OpenGL 4.2 Core. Upcoming versions have support for OpenGL 3.x. On Linux, it's not unusual for users to specifically prefer open source drivers over the alternative "binary blobs," so bear in mind that the version of Mesa that most people have supports only up to about OpenGL 2.1 compatibility.Mac OS X Lion 10.7 supports OpenGL 3.2 Core profile on supported hardware. Systems using GMA950 have only OGL1.4 support. Mac OS X only supports up to OpenGL 2.0 and OpenGL 2.1, depending on OS version and hardware.You don't necessarily need hardware support for good performance.
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