OpenGL 3.x and OpenGL 4.x came out all of a sudden, but not many people made the switch. Here you will learn how to create a window with an OpenGL 3.2 capable context, which can be used as a basis for further tutorials.
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GLSL is the OpenGL Shader Language, and is the OpenGL version of HLSL for DirectX. It allows us to manipulate the scene on a per vertex and per fragment basis, giving us total control.