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Wayland doesn't support getting the true global cursor position, but it can be faked well enough for what most applications use it for: querying the global cursor coordinates and transforming them to the window-relative coordinates manually. The global position is derived by taking the cursor position relative to the toplevel window, and offsetting it by the origin of the output the window is currently considered to be on. The cursor position and button state when the cursor is outside an application window are unknown, but this gives 'correct' coordinates when the window has focus, which is good enough for most applications.
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)