Retrieves the width of the screen in pixels.
This will return the with value passed to DX11 INIT, or a subsequent call to DX11 SET DISPLAY MODE,
and corresponds to the resolution of the back-/front buffer; it will not change if you resize the rendering window.

Return Dword = DX11 GET SCREEN WIDTH()

This function does not take any parameters.

The horizontal resolution of the render buffer.

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