This constructor creates the window with the size and pixel depth defined in mode. An optional style can be passed to customize the look and behavior of the window (borders, title bar, resizable, closable, ...).
The fourth parameter is an optional structure specifying advanced OpenGL context settings such as antialiasing, depth-buffer bits, etc. You shouldn't care about these parameters for a regular usage of the graphics module.
Value parameters
mode
Video mode to use (defines the width, height and depth of the rendering area of the window)
settings
Additional settings for the underlying OpenGL context
style
Window style, a bitwise OR combination of Style enumerators