fc4f248544
Without this the client library will flail around looking for a default provider, probably one named "indirect", and that defeats the point of having the EGL provider for direct context support in the first place. This assumes that "mesa" will work, of course, and in general it should. Mesa drivers will DTRT through the DRI3 setup path, and if our glamor is atop something non-Mesa then you should fall back to llvmpipe like 1.20. In the future it might be useful to differentiate the vendor here based on whether glamor is using gbm or streams. Fixes: xorg/xserver#1032
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
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