Module ff

Force feedback module.

To use force feedback, you have to create one or more Effects. Each Effect contains one or more BasicEffects and parameters that describe effect’s source, like it’s position, gain or used DistanceModel. Final strength of effect is based on saturating sum (to u16::MAX) of all base effects and time from the start of playback, attenuation from distance between effect source and listener (represented by gamepad) and effect’s gain.

See also Gilrs::set_listener_position() and Gamepad::is_ff_supported().

Example

use gilrs::Gilrs;
use gilrs::ff::{EffectBuilder, Replay, BaseEffect, BaseEffectType, Ticks};

let mut gilrs = Gilrs::new().unwrap();
let support_ff = gilrs
    .gamepads()
    .filter_map(|(id, gp)| if gp.is_ff_supported() { Some(id) } else { None })
    .collect::<Vec<_>>();

let duration = Ticks::from_ms(150);
let effect = EffectBuilder::new()
    .add_effect(BaseEffect {
        kind: BaseEffectType::Strong { magnitude: 60_000 },
        scheduling: Replay { play_for: duration, with_delay: duration * 3, ..Default::default() },
        envelope: Default::default(),
    })
    .add_effect(BaseEffect {
        kind: BaseEffectType::Weak { magnitude: 60_000 },
        scheduling: Replay { after: duration * 2, play_for: duration, with_delay: duration * 3 },
        ..Default::default()
    })
    .gamepads(&support_ff)
    .finish(&mut gilrs).unwrap();

effect.play().unwrap();

See examples/ff_pos.rs for more advanced example.

Structs

BaseEffect

Basic building block used to create more complex force feedback effects.

Effect

Handle to force feedback effect.

EffectBuilder

Creates new Effect.

Envelope

Envelope shaped attenuation(time) function.

Replay

Defines scheduling of the basic force feedback effect.

Ticks

Represents duration.

Enums

BaseEffectType

Kind of BaseEffect.

DistanceModel

Specifies how distance between effect source and listener attenuates effect.

DistanceModelError

Error that can be returned when passing DistanceModel with invalid value.

Error

Basic error type in force feedback module.

Repeat

Describes how long effect should be played.