Fix imgui renderer once and for all

Finally solved the problems with the imgui renderer after a long chat with clankers. Fixed some other stuff as well.

Reminder to keep the rendered_this_frame check as that's what solved it. Probably a deeper issue down there that caused us to render twice, but whatever.

game/Cargo.toml

@@ -15,3 +15,4 @@ raidillon_ecs = { path = "../ecs" }
 raidillon_engine = { path = "../engine" }
 raidillon_glium = { path = "../glium_platform", optional = true }
 glam = "0.30.5"
+winit = "0.30.12"

game/src/main.rs

@@ -11,15 +11,39 @@ use raidillon_core::scene::Scene;
 #[cfg(feature = "glium")]
 use raidillon_glium::GliumPlatform;
 use raidillon_core::DebugUIBuffer;
+use winit::event::{Event, WindowEvent};
 
 const TEST_GLTF: &str = "pink-monkey.gltf";
 
 const RENDERING_TEST_SYSTEM: &str = "rendering_test_system";
 
+const UPDATE_ASPECT_RATIO_SYSTEM: &str = "update_aspect_ratio_system";
+
 const MAIN_SCENE_ID: &str = "main_scene";
 
-struct RenderingTestSystem;
+struct UpdateAspectRatioSystem;
+impl System for UpdateAspectRatioSystem {
+    fn initialize(&mut self) {}
 
+    fn load_world(&mut self, ctx: &mut SystemContext) {}
+
+    fn update(&mut self, ctx: &mut SystemContext) {
+        // FIXME: Need an event handler rework for systems.
+        match &ctx.platform_context.current_event {
+            Event::WindowEvent { event, .. } => match event {
+                WindowEvent::Resized(sz) => {
+                    let _ = ctx.scene.world.query_mut::<&mut Camera>().into_iter().map(|mut cam| {
+                        cam.1.aspect = sz.width as f32 / sz.height as f32;
+                    });
+                }
+                _ => {}
+            },
+            _ => {}
+        }
+    }
+}
+
+struct RenderingTestSystem;
 impl System for RenderingTestSystem {
     fn initialize(&mut self) {}
     fn load_world(&mut self, ctx: &mut SystemContext) {
@@ -61,6 +85,7 @@ fn main() {
     // engine.system_manager.add_system("spawn_chunks".to_string(), ChunkSystem);
     // engine.system_manager.add_system("movement".to_string(), MovementSystem);
     engine.system_manager.add_system(RENDERING_TEST_SYSTEM, Box::new(RenderingTestSystem));
+    engine.system_manager.add_system(UPDATE_ASPECT_RATIO_SYSTEM, Box::new(UpdateAspectRatioSystem));
 
     // Set up the scene
     let main_scene = Scene::new(