1 extern crate sdl2;
2
main() -> Result<(), String>3 fn main() -> Result<(), String> {
4 let sdl_context = sdl2::init()?;
5 let game_controller_subsystem = sdl_context.game_controller()?;
6
7 let available = game_controller_subsystem.num_joysticks()
8 .map_err(|e| format!("can't enumerate joysticks: {}", e))?;
9
10 println!("{} joysticks available", available);
11
12 // Iterate over all available joysticks and look for game controllers.
13 let mut controller = (0..available).find_map(|id| {
14 if !game_controller_subsystem.is_game_controller(id) {
15 println!("{} is not a game controller", id);
16 return None;
17 }
18
19 println!("Attempting to open controller {}", id);
20
21 match game_controller_subsystem.open(id) {
22 Ok(c) => {
23 // We managed to find and open a game controller,
24 // exit the loop
25 println!("Success: opened \"{}\"", c.name());
26 Some(c)
27 },
28 Err(e) => {
29 println!("failed: {:?}", e);
30 None
31 }
32 }
33 }).expect("Couldn't open any controller");
34
35 println!("Controller mapping: {}", controller.mapping());
36
37 let (mut lo_freq, mut hi_freq) = (0, 0);
38
39 for event in sdl_context.event_pump()?.wait_iter() {
40 use sdl2::event::Event;
41 use sdl2::controller::Axis;
42
43 match event {
44 Event::ControllerAxisMotion{ axis: Axis::TriggerLeft, value: val, .. } => {
45 // Trigger axes go from 0 to 32767, so this should be okay
46 lo_freq = (val as u16) * 2;
47 match controller.set_rumble(lo_freq, hi_freq, 15000) {
48 Ok(()) => println!("Set rumble to ({}, {})", lo_freq, hi_freq),
49 Err(e) => println!("Error setting rumble to ({}, {}): {:?}", lo_freq, hi_freq, e),
50 }
51 }
52 Event::ControllerAxisMotion{ axis: Axis::TriggerRight, value: val, .. } => {
53 // Trigger axes go from 0 to 32767, so this should be okay
54 hi_freq = (val as u16) * 2;
55 match controller.set_rumble(lo_freq, hi_freq, 15000) {
56 Ok(()) => println!("Set rumble to ({}, {})", lo_freq, hi_freq),
57 Err(e) => println!("Error setting rumble to ({}, {}): {:?}", lo_freq, hi_freq, e),
58 }
59 }
60 Event::ControllerAxisMotion{ axis, value: val, .. } => {
61 // Axis motion is an absolute value in the range
62 // [-32768, 32767]. Let's simulate a very rough dead
63 // zone to ignore spurious events.
64 let dead_zone = 10_000;
65 if val > dead_zone || val < -dead_zone {
66 println!("Axis {:?} moved to {}", axis, val);
67 }
68 }
69 Event::ControllerButtonDown{ button, .. } =>
70 println!("Button {:?} down", button),
71 Event::ControllerButtonUp{ button, .. } =>
72 println!("Button {:?} up", button),
73 Event::Quit{..} => break,
74 _ => (),
75 }
76 }
77
78 Ok(())
79 }
80