Creating OpenGL context without window

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The old method for purely windowless OpenGL is using a PBuffer. On Windows this requires the creation of a intermediate OpenGL context using a regular window to obtain the required extension function pointers. On X11/GLX it works without further ado.

The modern way to implement off-screen rendering is using a regular, but hidden window with the usual OpenGL context and a FBO as render target.

The bleeding edge, and yet not very well supported method (except on certain embedded devices) is using EGL for drawable creation.

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