Implement the core engine methods

raidillon_core/src/engine.rs

@@ -1,6 +1,56 @@
+use std::alloc::System;
 use crate::SceneManager;
+use crate::system::{SystemContext, SystemManager};
+use raidillon_platform::EngineTrait;
 
 pub struct Engine {
-    scene_manager: SceneManager,
+    pub scene_manager: SceneManager,
-    // TODO: Systems
+    pub system_manager: SystemManager,
+}
+
+impl EngineTrait for Engine {
+    fn new() -> Self {
+        let scene_manager = SceneManager::new();
+        let system_manager = SystemManager::new();
+        Self {
+            scene_manager,
+            system_manager,
+        }
+    }
+
+    /// Run the first frame, load the world.
+    fn initialize(&mut self) -> bool {
+        // Engine Loading Stage 1: initialize systems
+        for (system_id, system) in self.system_manager.systems.iter_mut() {
+            system.initialize();
+        }
+
+        let mut ctx = SystemContext {
+            scene: self.scene_manager.current_mut(),
+        };
+
+        // Engine Loading Stage 2: load world
+        for (system_id, system) in self.system_manager.systems.iter_mut() {
+            system.load_world(&mut ctx);
+        }
+
+        true
+    }
+
+    /// Runs every frame
+    fn update(&mut self) {
+        let mut ctx = SystemContext {
+            scene: self.scene_manager.current_mut(),
+        };
+
+        for (system_id, system) in self.system_manager.systems.iter_mut() {
+            system.update(&mut ctx);
+        }
+    }
+
+    // pub fn build_system_context(&mut self) -> SystemContext {
+    //     SystemContext {
+    //         scene: self.scene_manager.current_mut(),
+    //     }
+    // }
 }