766bf01b21
Desktop GL can handle arbitrary rops here, GLES can't. The switch statement attempts to optimize some cases that GLES can still handle if we precompute the right pixel value, but we were then throwing that pixel value away and using gc->fgPixel anyway. Fix this, and now xts-render passes against glamor+gles.
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.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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