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In this example code it deals with framebuffers before setting up the context.
I’ve read the man pages of the functions, but I still don’t understand exactly what’s going on.
So my question is, what exactly is a framebuffer in GLX and how significant is configuring it?
A framebuffer is an area of memory that holds a displayable image. You need one when creating an OpenGL context so that OpenGL has a place to store the image it renders.