c++ - GLX/X11 Changing the rendering resolution -

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i have made simple application creates window opengl 4.2 context , takes user input.

i have implemented making window go fullscreen xrandr , can change display resolution.

i change don't have set displays resolution , window/contexts renders @ lower resolution display stays @ default.

how implement this? extensions provide or can xrandr , manipulating window rather root window(dektop)?

thanks.


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