Support rebinding gamepad inputs

src/app.rs

@@ -8,7 +8,7 @@ use egui::{
 use gilrs::{EventType, Gilrs};
 use winit::{
     application::ApplicationHandler,
-    event::{KeyEvent, WindowEvent},
+    event::WindowEvent,
     event_loop::{ActiveEventLoop, EventLoopProxy},
     window::Window,
 };
@@ -83,7 +83,7 @@ impl ApplicationHandler<UserEvent> for Application {
         match &event {
             WindowEvent::KeyboardInput { event, .. } => {
                 self.controllers.handle_key_event(event);
-                viewport.handle_key_event(event);
+                viewport.app.handle_key_event(event);
             }
             WindowEvent::Focused(new_focused) => {
                 self.focused = new_focused.then_some(viewport_id);
@@ -143,7 +143,17 @@ impl ApplicationHandler<UserEvent> for Application {
 
     fn user_event(&mut self, event_loop: &ActiveEventLoop, event: UserEvent) {
         match event {
-            UserEvent::GamepadEvent(event) => self.controllers.handle_gamepad_event(&event),
+            UserEvent::GamepadEvent(event) => {
+                self.controllers.handle_gamepad_event(&event);
+                let Some(viewport) = self
+                    .focused
+                    .as_ref()
+                    .and_then(|id| self.viewports.get_mut(id))
+                else {
+                    return;
+                };
+                viewport.app.handle_gamepad_event(&event);
+            }
             UserEvent::OpenInput => {
                 let input = InputWindow::new(self.mappings.clone());
                 self.open(event_loop, Box::new(input));
@@ -248,10 +258,6 @@ impl Viewport {
         }
     }
 
-    pub fn handle_key_event(&mut self, event: &KeyEvent) {
-        self.app.handle_key_event(event);
-    }
-
     fn redraw(&mut self, event_loop: &ActiveEventLoop) -> Option<Action> {
         let mut input = self.state.take_egui_input(&self.window);
         input.viewports = std::iter::once((ViewportId::ROOT, self.info.clone())).collect();

src/input.rs

@@ -19,6 +19,11 @@ pub struct GamepadInfo {
     pub bound_to: Option<SimId>,
 }
 
+pub trait Mappings {
+    fn mapping_names(&self) -> HashMap<VBKey, Vec<String>>;
+    fn clear_mappings(&mut self, key: VBKey);
+}
+
 pub struct GamepadMapping {
     buttons: HashMap<Code, VBKey>,
     axes: HashMap<Code, (VBKey, VBKey)>,
@@ -54,6 +59,59 @@ impl GamepadMapping {
 
         Self { buttons, axes }
     }
+
+    pub fn add_button_mapping(&mut self, key: VBKey, code: Code) {
+        let entry = self.buttons.entry(code).or_insert(VBKey::empty());
+        *entry = entry.union(key);
+    }
+
+    pub fn add_axis_neg_mapping(&mut self, key: VBKey, code: Code) {
+        let entry = self
+            .axes
+            .entry(code)
+            .or_insert((VBKey::empty(), VBKey::empty()));
+        entry.0 = entry.0.union(key);
+    }
+
+    pub fn add_axis_pos_mapping(&mut self, key: VBKey, code: Code) {
+        let entry = self
+            .axes
+            .entry(code)
+            .or_insert((VBKey::empty(), VBKey::empty()));
+        entry.1 = entry.1.union(key);
+    }
+}
+
+impl Mappings for GamepadMapping {
+    fn mapping_names(&self) -> HashMap<VBKey, Vec<String>> {
+        let mut results: HashMap<VBKey, Vec<String>> = HashMap::new();
+        for (axis, (left_keys, right_keys)) in &self.axes {
+            for key in left_keys.iter() {
+                results.entry(key).or_default().push(format!("-{axis}"));
+            }
+            for key in right_keys.iter() {
+                results.entry(key).or_default().push(format!("+{axis}"));
+            }
+        }
+        for (button, keys) in &self.buttons {
+            for key in keys.iter() {
+                results.entry(key).or_default().push(format!("{button}"));
+            }
+        }
+        results
+    }
+
+    fn clear_mappings(&mut self, key: VBKey) {
+        self.axes.retain(|_, (left, right)| {
+            *left = left.difference(key);
+            *right = right.difference(key);
+            !(left.is_empty() && right.is_empty())
+        });
+        self.buttons.retain(|_, keys| {
+            *keys = keys.difference(key);
+            !keys.is_empty()
+        });
+    }
 }
 
 #[derive(Default)]
@@ -81,15 +139,10 @@ impl InputMapping {
         let entry = self.keys.entry(keyboard_key).or_insert(VBKey::empty());
         *entry = entry.union(key);
     }
-
-    pub fn clear_keyboard_mappings(&mut self, key: VBKey) {
-        self.keys.retain(|_, keys| {
-            *keys = keys.difference(key);
-            *keys != VBKey::empty()
-        });
 }
 
-    pub fn keyboard_mapping_names(&self) -> HashMap<VBKey, String> {
+impl Mappings for InputMapping {
+    fn mapping_names(&self) -> HashMap<VBKey, Vec<String>> {
         let mut results: HashMap<VBKey, Vec<String>> = HashMap::new();
         for (keyboard_key, keys) in &self.keys {
             let name = match keyboard_key {
@@ -101,12 +154,13 @@ impl InputMapping {
             }
         }
         results
-            .into_iter()
-            .map(|(k, mut v)| {
-                v.sort();
-                (k, v.join(", "))
-            })
-            .collect()
+    }
+
+    fn clear_mappings(&mut self, key: VBKey) {
+        self.keys.retain(|_, keys| {
+            *keys = keys.difference(key);
+            !keys.is_empty()
+        });
     }
 }
 
@@ -154,6 +208,14 @@ impl MappingProvider {
         self.sim_mappings.get(&sim_id).unwrap()
     }
 
+    pub fn for_gamepad(&self, gamepad_id: GamepadId) -> Option<Arc<RwLock<GamepadMapping>>> {
+        let lock = self.gamepad_info.read().unwrap();
+        let device_id = lock.get(&gamepad_id)?.device_id;
+        drop(lock);
+        let lock = self.device_mappings.read().unwrap();
+        lock.get(&device_id).cloned()
+    }
+
     pub fn handle_gamepad_connect(&self, gamepad: &Gamepad) {
         let device_id = DeviceId(
             gamepad.vendor_id().unwrap_or_default(),

src/window.rs

@@ -18,4 +18,7 @@ pub trait AppWindow {
     fn handle_key_event(&mut self, event: &KeyEvent) {
         let _ = event;
     }
+    fn handle_gamepad_event(&mut self, event: &gilrs::Event) {
+        let _ = event;
+    }
 }

src/window/input.rs

@@ -2,17 +2,19 @@ use egui::{
     Button, CentralPanel, Context, Label, Layout, TopBottomPanel, Ui, ViewportBuilder, ViewportId,
 };
 use egui_extras::{Column, TableBuilder};
+use gilrs::{EventType, GamepadId};
+use std::sync::RwLock;
 
 use crate::{
     emulator::{SimId, VBKey},
-    input::MappingProvider,
+    input::{MappingProvider, Mappings},
 };
 
 use super::AppWindow;
 
 pub struct InputWindow {
     mappings: MappingProvider,
-    now_binding: Option<(SimId, VBKey)>,
+    now_binding: Option<VBKey>,
     active_tab: InputTab,
 }
 
@@ -42,11 +44,15 @@ impl InputWindow {
         }
     }
 
-    fn show_key_bindings(&mut self, ui: &mut Ui, sim_id: SimId) {
-        let mappings = self.mappings.for_sim(sim_id);
-        let binding_names = {
+    fn show_bindings<T: Mappings>(
+        &mut self,
+        ui: &mut Ui,
+        mappings: &RwLock<T>,
+        bind_message: &str,
+    ) {
+        let mut names = {
             let mapping = mappings.read().unwrap();
-            mapping.keyboard_mapping_names()
+            mapping.mapping_names()
         };
         TableBuilder::new(ui)
             .column(Column::remainder())
@@ -56,29 +62,33 @@ impl InputWindow {
                 for keys in KEY_NAMES.chunks_exact(2) {
                     body.row(20.0, |mut row| {
                         for (key, name) in keys {
-                            let binding = binding_names.get(key).map(|s| s.as_str());
+                            let binding = names.remove(key).map(|mut s| {
+                                s.sort();
+                                s.join(", ")
+                            });
                             row.col(|ui| {
                                 let size = ui.available_size_before_wrap();
                                 let width = size.x;
                                 let height = size.y;
                                 ui.add_sized((width * 0.2, height), Label::new(*name));
-                                let label_text = if self.now_binding == Some((sim_id, *key)) {
-                                    "Press any input"
+                                let label_text = if self.now_binding == Some(*key) {
+                                    bind_message
                                 } else {
-                                    binding.unwrap_or("")
+                                    binding.as_deref().unwrap_or("")
                                 };
                                 if ui
                                     .add_sized((width * 0.6, height), Button::new(label_text))
                                     .clicked()
                                 {
-                                    self.now_binding = Some((sim_id, *key))
+                                    self.now_binding = Some(*key);
                                 }
                                 if ui
                                     .add_sized(ui.available_size(), Button::new("Clear"))
                                     .clicked()
                                 {
                                     let mut mapping = mappings.write().unwrap();
-                                    mapping.clear_keyboard_mappings(*key);
+                                    mapping.clear_mappings(*key);
+                                    self.now_binding = None;
                                 }
                             });
                         }
@@ -87,6 +97,11 @@ impl InputWindow {
             });
     }
 
+    fn show_key_bindings(&mut self, ui: &mut Ui, sim_id: SimId) {
+        let mappings = self.mappings.for_sim(sim_id).clone();
+        self.show_bindings(ui, &mappings, "Press any key");
+    }
+
     fn show_gamepads(&mut self, ui: &mut Ui) {
         let mut gamepads = self.mappings.gamepad_info();
         gamepads.sort_by_key(|g| usize::from(g.id));
@@ -114,9 +129,21 @@ impl InputWindow {
                         None => self.mappings.unassign_gamepad(gamepad.id),
                     }
                 }
+                ui.separator();
+                if ui.button("Rebind").clicked() {
+                    self.active_tab = InputTab::RebindGamepad(gamepad.id);
+                }
             });
         }
     }
+
+    fn show_gamepad_bindings(&mut self, ui: &mut Ui, gamepad_id: GamepadId) {
+        let Some(mappings) = self.mappings.for_gamepad(gamepad_id) else {
+            self.active_tab = InputTab::Gamepads;
+            return;
+        };
+        self.show_bindings(ui, &mappings, "Press any input");
+    }
 }
 
 impl AppWindow for InputWindow {
@@ -133,9 +160,17 @@ impl AppWindow for InputWindow {
     fn show(&mut self, ctx: &Context) {
         TopBottomPanel::top("options").show(ctx, |ui| {
             ui.horizontal(|ui| {
+                let old_active_tab = self.active_tab;
                 ui.selectable_value(&mut self.active_tab, InputTab::Player1, "Player 1");
                 ui.selectable_value(&mut self.active_tab, InputTab::Player2, "Player 2");
                 ui.selectable_value(&mut self.active_tab, InputTab::Gamepads, "Gamepads");
+                if matches!(self.active_tab, InputTab::RebindGamepad(_)) {
+                    let tab = self.active_tab;
+                    ui.selectable_value(&mut self.active_tab, tab, "Rebind Gamepad");
+                }
+                if old_active_tab != self.active_tab {
+                    self.now_binding = None;
+                }
             });
         });
         CentralPanel::default().show(ctx, |ui| {
@@ -143,6 +178,7 @@ impl AppWindow for InputWindow {
                 InputTab::Player1 => self.show_key_bindings(ui, SimId::Player1),
                 InputTab::Player2 => self.show_key_bindings(ui, SimId::Player2),
                 InputTab::Gamepads => self.show_gamepads(ui),
+                InputTab::RebindGamepad(id) => self.show_gamepad_bindings(ui, id),
             };
         });
     }
@@ -151,12 +187,54 @@ impl AppWindow for InputWindow {
         if !event.state.is_pressed() {
             return;
         }
-        let Some((sim_id, vb)) = self.now_binding.take() else {
+        let sim_id = match self.active_tab {
+            InputTab::Player1 => SimId::Player1,
+            InputTab::Player2 => SimId::Player2,
+            _ => {
+                return;
+            }
+        };
+        let Some(vb) = self.now_binding.take() else {
             return;
         };
         let mut mappings = self.mappings.for_sim(sim_id).write().unwrap();
         mappings.add_keyboard_mapping(vb, event.physical_key);
     }
+
+    fn handle_gamepad_event(&mut self, event: &gilrs::Event) {
+        let InputTab::RebindGamepad(gamepad_id) = self.active_tab else {
+            return;
+        };
+        if gamepad_id != event.id {
+            return;
+        }
+        let Some(mappings) = self.mappings.for_gamepad(gamepad_id) else {
+            return;
+        };
+        let Some(vb) = self.now_binding else {
+            return;
+        };
+        match event.event {
+            EventType::ButtonPressed(_, code) => {
+                let mut mapping = mappings.write().unwrap();
+                mapping.add_button_mapping(vb, code);
+                self.now_binding.take();
+            }
+            EventType::AxisChanged(_, value, code) => {
+                if value < -0.75 {
+                    let mut mapping = mappings.write().unwrap();
+                    mapping.add_axis_neg_mapping(vb, code);
+                    self.now_binding.take();
+                }
+                if value > 0.75 {
+                    let mut mapping = mappings.write().unwrap();
+                    mapping.add_axis_pos_mapping(vb, code);
+                    self.now_binding.take();
+                }
+            }
+            _ => {}
+        }
+    }
 }
 
 #[derive(Clone, Copy, PartialEq, Eq)]
@@ -164,4 +242,5 @@ enum InputTab {
     Player1,
     Player2,
     Gamepads,
+    RebindGamepad(GamepadId),
 }