Device events in lua

main.lua

@@ -1,12 +1,16 @@
 print("Hello from a lua script!")
 
-function init()
+function couch.init()
    print("Hello from \"init\"")
 end
 
-function update(delta)
+function couch.update(delta)
    local transform = couch.root:find_node("cube"):get_transform()
    transform.rotation[2] = transform.rotation[2] + delta
    transform.rotation[1] = transform.rotation[1] - delta * 0.3
    couch.root:find_node("cube"):set_transform(transform)
 end
+
+function couch.keyreleased(scancode)
+   print("Key was released")
+end

src/device.rs

@@ -1,32 +0,0 @@
-use std::collections::HashMap;
-
-use glium::glutin;
-use glutin::event::*;
-
-pub use glutin::event::VirtualKeyCode as Key;
-
-pub struct DeviceManager {
-    key_map: HashMap<Key, ElementState>
-}
-
-impl DeviceManager {
-    pub fn handle(&mut self, event: DeviceEvent) {
-	match event {
-	    DeviceEvent::Key(
-		KeyboardInput{ virtual_keycode: Some(keycode), state, .. }
-	    ) => self.update(keycode, state),
-	    _ => (),
-	};
-    }
-    pub fn new() -> Self {
-	DeviceManager {
-	    key_map: HashMap::new(),
-	}
-    }
-    pub fn is_pressed(&self, key: &Key) -> bool {
-	matches!(self.key_map.get(key), Some(ElementState::Pressed))
-    }
-    fn update(&mut self, key: Key, state: ElementState) {
-	self.key_map.insert(key, state);
-    }	
-}

src/main.rs

@@ -1,5 +1,3 @@
-mod device;
-
 mod model;
 use model::Model;
 
@@ -31,8 +29,6 @@ fn main() {
     let fragment_shader_src = include_str!("flat.frag");
     let program = glium::Program::from_source(&display, vertex_shader_src, fragment_shader_src, None).unwrap();
 
-    let mut device_manager = crate::device::DeviceManager::new();
-
     let root = Rc::new(RefCell::new(Node::new("_root_".to_string(), GameObject::Null)));
     {
 	// Initial scene setup
@@ -64,7 +60,14 @@ fn main() {
 		}
 	    },
 	    glutin::event::Event::DeviceEvent { event, .. } => {
-		device_manager.handle(event);
+		if let glutin::event::DeviceEvent::Key(
+		    glutin::event::KeyboardInput { scancode, state, .. }
+		) = event {
+		    match state {
+			glutin::event::ElementState::Pressed => script_lang.key_pressed(scancode),
+			glutin::event::ElementState::Released => script_lang.key_released(scancode),
+		    }
+		};
 	    },
 	    glutin::event::Event::MainEventsCleared => {
 		let now = std::time::Instant::now();

src/scripting.rs

@@ -4,4 +4,6 @@ pub use lua::Lua;
 pub trait ScriptLang {
     fn init(&mut self);
     fn update(&mut self, delta: f32);
+    fn key_pressed(&mut self, key: u32);
+    fn key_released(&mut self, key: u32);
 }

src/scripting/lua.rs

@@ -87,12 +87,26 @@ impl Lua {
 
 impl ScriptLang for Lua {
     fn init(&mut self) {
-	self.ctx.load(&"init()").exec().ok();
+	self.ctx.load(chunk! {
+	    if couch.init then couch.init() end
+	}).exec().unwrap();
     }
 
     fn update(&mut self, delta: f32) {
 	self.ctx.load(chunk! {
-	    update($delta)
-	}).exec().ok();
+	    if couch.update then couch.update($delta) end
+	}).exec().unwrap();
+    }
+
+    fn key_pressed(&mut self, key: u32) {
+	self.ctx.load(chunk! {
+	    if couch.keypressed then couch.keypressed($key) end
+	}).exec().unwrap();
+    }
+
+    fn key_released(&mut self, key: u32) {
+	self.ctx.load(chunk! {
+	    if couch.keyreleased then couch.keyreleased($key) end
+	}).exec().unwrap();
     }
 }