feat(engine): use ECS architecture

1 files changed, 110 insertions, 0 deletions

diff --git a/engine/src/input.rs b/engine/src/input.rs
new file mode 100644
index 0000000..78c8270
--- /dev/null
+++ b/engine/src/input.rs
@@ -0,0 +1,110 @@
+use std::collections::HashMap;
+
+use ecs::extension::Collector as ExtensionCollector;
+use ecs::sole::Single;
+use ecs::Sole;
+
+use crate::event::Start as StartEvent;
+use crate::vector::Vec2;
+use crate::window::{Key, KeyState, Window};
+
+#[derive(Debug, Clone, Default, Sole)]
+pub struct Keys
+{
+    map: HashMap<Key, KeyState>,
+}
+
+impl Keys
+{
+    #[must_use]
+    pub fn new() -> Self
+    {
+        Self::default()
+    }
+
+    #[must_use]
+    pub fn get_key_state(&self, key: Key) -> KeyState
+    {
+        self.map.get(&key).copied().unwrap_or(KeyState::Released)
+    }
+
+    pub fn set_key_state(&mut self, key: Key, key_state: KeyState)
+    {
+        if matches!(key_state, KeyState::Released) {
+            self.map.remove(&key);
+            return;
+        }
+
+        if matches!(key_state, KeyState::Repeat) {
+            return;
+        }
+
+        self.map.insert(key, key_state);
+    }
+
+    #[must_use]
+    pub fn is_anything_pressed(&self) -> bool
+    {
+        !self.map.is_empty()
+    }
+}
+
+#[derive(Debug, Clone, Default, Sole)]
+pub struct Cursor
+{
+    pub position: Vec2<f64>,
+}
+
+impl Cursor
+{
+    #[must_use]
+    pub fn new() -> Self
+    {
+        Self::default()
+    }
+}
+
+/// Input extension.
+#[derive(Debug, Default)]
+pub struct Extension {}
+
+impl ecs::extension::Extension for Extension
+{
+    fn collect(self, mut collector: ExtensionCollector<'_>)
+    {
+        collector.add_system(StartEvent, initialize);
+
+        collector.add_sole(Keys::default()).ok();
+        collector.add_sole(Cursor::default()).ok();
+    }
+}
+
+fn initialize(keys: Single<Keys>, cursor: Single<Cursor>, window: Single<Window>)
+{
+    let keys_weak_ref = keys.to_weak_ref();
+
+    window.set_key_callback(move |key, _scancode, key_state, _modifiers| {
+        let keys_weak_ref = keys_weak_ref.clone();
+
+        let keys_ref = keys_weak_ref.access().expect("No world");
+
+        let mut keys = keys_ref.to_single();
+
+        keys.set_key_state(key, key_state);
+    });
+
+    let cursor_weak_ref = cursor.to_weak_ref();
+
+    window.set_cursor_pos_callback(move |cursor_position| {
+        let cursor_weak_ref = cursor_weak_ref.clone();
+
+        let cursor_ref = cursor_weak_ref.access().expect("No world");
+
+        let mut cursor = cursor_ref.to_single();
+
+        cursor.position = Vec2 {
+            x: cursor_position.x,
+            y: cursor_position.y,
+        };
+    });
+}