macOS-style scroll acceleration

[teamschlaflos]

Hyprland already supports custom scroll_points via libinput_config_accel_set_points(), but the current implementation requires users to manually provide <step> <points> arrays. This makes it hard to achieve a natural, nonlinear feel like on macOS, where scrolling accelerates exponentially based on velocity.

This feature request is to add a higher-level config option (e.g. scroll_curve = exponential …) that automatically generates a smooth, macOS-style scroll acceleration curve.

Introduce a new config, such as:

input {
   scroll_curve = exponential base=1.0 scale=0.2 exponent=1.6
}

Internally, Hyprland would expand this into a scrollStep + scrollPoints array and call libinput_config_accel_set_points() as today.

Alternatives considered:

• External evdev -> uinput proxies can fake exponential scroll, but require disabling the real device and forwarding all events. This is hacky and fragile.
• Manually tuning scroll_points works but is trial-and-error and hard to share across devices.

[teamschlaflos]

Found a relevant discussion between the libinput maintainer and Yinon. Yinon, who wrote a custom acceleration function application, is debating with the maintainer how to best implement this feature centrally in a new libinput-based configuration library. ✨