.gitattributes

@@ -0,0 +1,2 @@
+assets/models/* filter=lfs diff=lfs merge=lfs -text
+assets/exr/* filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -1,3 +1,3 @@
-/target
-.aider*
+target/
 *.patch
+.idea/

.pre-commit-config.yaml

@@ -0,0 +1,11 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: trailing-whitespace
+        files: "\\.rs$"
+      - id: end-of-file-fixer
+        files: "\\.rs$"
+      - id: mixed-line-ending
+        args: [--fix=lf]
+        files: "\\.rs$"

Cargo.toml

@@ -1,9 +1,11 @@
 [workspace]
 members = [
-    "raidillon_core",
-    "raidillon_ecs",
-    "raidillon_render",
-    "raidillon_ui",
-    "raidillon_game",
-    "raidillon_input",
+    "core",
+    "glium_platform",
+    "platform",
+    "asset",
+    "game",
+    "ecs",
+    "engine",
+    "physics", "app",
 ]

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
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+ Everyone is permitted to copy and distribute verbatim copies
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+
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+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -0,0 +1,3 @@
+# Raidillon rewrite number #23818491847214
+
+Starting in 2025-08-03, 17:59 UTC+3

app/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "raidillon_app"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+raidillon_engine = { path = "../engine" }
+raidillon_platform = { path = "../platform" }
+raidillon_assets = { path = "../asset" }
+raidillon_ecs = { path = "../ecs" }
+raidillon_physics = { path = "../physics" }
+raidillon_glium = { path = "../glium_platform", optional = true }
+raidillon_core = { path = "../core" }
+
+[features]
+glium = ["raidillon_glium"]

app/src/lib.rs

@@ -0,0 +1,45 @@
+pub mod prelude;
+
+pub use prelude::*;
+
+pub struct App {
+    pub engine: Option<Engine>,
+}
+
+impl App {
+    pub fn new() -> Self {
+        let engine = Engine::new();
+        Self { engine: Some(engine) }
+    }
+
+    pub fn add_system<S: System + Default + 'static>(&mut self) -> &mut Self {
+        self.engine.as_mut().unwrap().system_manager.add::<S>();
+        self
+    }
+
+    pub fn add_scene(&mut self, id: SceneID, scene: Scene) -> &mut Self {
+        self.engine.as_mut().unwrap().scene_manager.add_scene(id, scene);
+        self
+    }
+
+    pub fn set_active_scene(&mut self, id: SceneID) -> &mut Self {
+        self.engine.as_mut().unwrap().scene_manager.set_active_scene(id);
+        self
+    }
+
+    pub fn run(&mut self, title: String, width: u32, height: u32) {
+        #[cfg(feature = "glium")]
+        {
+            let platform = GliumPlatform::initialize(
+                self.engine.take().unwrap(),
+                title,
+                width,
+                height,
+            );
+            platform.run();
+        }
+
+        #[cfg(not(any(feature = "glium")))]
+        compile_error!("No platform feature enabled.");
+    }
+}

app/src/prelude.rs

@@ -0,0 +1,47 @@
+pub use raidillon_engine::{
+    Engine,
+    system::System,
+    EngineResources,
+    InputState,
+    system::SystemContext,
+};
+
+pub use raidillon_platform::{
+    Platform,
+    Camera,
+    PlatformContext,
+    TimeContext,
+    DebugWireframes,
+    DebugWireframesRef,
+    DebugWireframeVertex,
+    settings::{Settings, WindowMode},
+};
+
+pub use raidillon_assets::{
+    ModelManagerRef,
+    model_path,
+};
+
+pub use raidillon_ecs::{
+    components::{
+        CameraMode,
+        CharacterBodyComponent,
+        ModelHandle,
+        RigidBodyComponent,
+        Transform,
+    },
+};
+
+pub use raidillon_physics::Physics;
+
+pub use raidillon_core::{
+    scene::{Scene, SceneID},
+    EguiQueue,
+    engine::EngineTrait,
+};
+
+#[cfg(feature = "glium")]
+pub use raidillon_glium::{
+    GliumPlatform,
+    RenderingSystem,
+};

asset/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "raidillon_assets"
+version = "0.1.0"
+edition = "2024"

asset/src/lib.rs

@@ -0,0 +1,22 @@
+pub mod model_manager;
+
+use std::path::PathBuf;
+pub use crate::model_manager::{ModelManager, ModelManagerRef};
+
+pub use crate::model_manager::ModelID;
+
+#[macro_export]
+macro_rules! include_shader {
+    ($path:expr) => {
+        include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../assets/shaders/", $path))
+    };
+}
+
+pub fn model_path(path: &str) -> PathBuf {
+    let manifest_dir = env!("CARGO_MANIFEST_DIR");
+    PathBuf::from(manifest_dir)
+        .join("..")
+        .join("assets")
+        .join("models")
+        .join(path)
+}

asset/src/model_manager.rs

@@ -0,0 +1,17 @@
+use std::any::Any;
+use std::cell::RefCell;
+use std::path::{Path, PathBuf};
+use std::rc::Rc;
+
+pub type ModelManagerRef = Rc<RefCell<Box<dyn ModelManager>>>;
+pub type ModelID = &'static str;
+
+/// The asset manager trait of Raidillon.
+pub trait ModelManager: Any {
+    /// Loads a gltf model to VRAM.
+    fn load_gltf(&mut self, id: ModelID, path: &Path);
+    /// Unloads the loaded model from VRAM.
+    fn unload_model(&mut self, id: ModelID);
+
+    fn get_model(&self, id: &ModelID) -> Option<&dyn Any>;
+}

assets/shaders/debug_wireframe.frag

@@ -0,0 +1,9 @@
+#version 330 core
+
+in vec4 v_color;
+
+out vec4 frag_color;
+
+void main() {
+    frag_color = v_color;
+}

assets/shaders/debug_wireframe.vert

@@ -0,0 +1,14 @@
+#version 330 core
+
+in vec3 position;
+in vec4 color;
+
+uniform mat4 view;
+uniform mat4 projection;
+
+out vec4 v_color;
+
+void main() {
+    v_color = color;
+    gl_Position = projection * view * vec4(position, 1.0);
+}

assets/shaders/gl_textured.frag

@@ -0,0 +1,43 @@
+#version 330 core
+
+in  vec3 v_normal;
+in  vec2 v_tex;
+in  vec3 v_position;
+
+out vec4 frag_color;
+
+uniform vec3 u_light;      // direction TO the light (normalized)
+uniform sampler2D tex;
+uniform vec3 color;        // base colour factor (acts as solid colour when no texture)
+
+void main() {
+    // Combine base texture (or constant white) with colour factor supplied by CPU.
+    vec3 base_col = texture(tex, v_tex).rgb * color;
+
+    vec3 N = normalize(v_normal);
+    vec3 L = normalize(u_light);
+
+    // Classic Blinn-Phong lighting
+    // Ambient: always present
+    vec3 ambient = base_col * 0.15;
+
+    // Diffuse: N dot L, clamped
+    float NdotL = max(dot(N, L), 0.0);
+    vec3 diffuse = base_col * NdotL * 0.7;
+
+    // Specular: only on surfaces facing the light (NdotL > 0)
+    float specular = 0.0;
+    if (NdotL > 0.0) {
+        vec3 V = normalize(-v_position);         // view direction (camera at origin in view space)
+        vec3 H = normalize(L + V);               // half-vector
+        float NdotH = max(dot(N, H), 0.0);
+        specular = pow(NdotH, 32.0) * 0.5;       // tighter highlight, moderated intensity
+    }
+
+    vec3 result = ambient + diffuse + vec3(specular);
+
+    // Convert from linear to sRGB for display (approximate gamma correction)
+    result = pow(result, vec3(1.0 / 2.2));
+
+    frag_color = vec4(result, 1.0);
+}

assets/shaders/gl_textured.vert

@@ -20,4 +20,4 @@ void main() {
     v_tex      = tex_coords * uv_scale + uv_offset;
     v_position = (modelview * vec4(position, 1.0)).xyz;
     gl_Position = projection * modelview * vec4(position, 1.0);
-}
+}

assets/shaders/skybox.frag

@@ -9,14 +9,19 @@ uniform sampler2D equirect;
 const vec2 inv_atan = vec2(0.15915494309, 0.31830988618);
 
 vec2 sample_spherical_map(vec3 v) {
-    vec2 uv = vec2(atan(v.z, v.x), asin(v.y));
+    vec2 uv = vec2(atan(v.z, v.x), asin(clamp(v.y, -1.0, 1.0)));
     uv *= inv_atan;
     uv += 0.5;
+    uv.x = fract(uv.x);
     return uv;
 }
 
 void main() {
     vec2 uv = sample_spherical_map(normalize(direction));
+    uv.y = 1.0 - uv.y;
+    vec2 size = vec2(textureSize(equirect, 0));
+    float epsY = 0.5 / max(size.y, 1.0);
+    uv.y = clamp(uv.y, epsY, 1.0 - epsY);
     vec3 color = texture(equirect, uv).rgb;
     frag_color = vec4(color, 1.0);
-} 
+}

assets/shaders/skybox.vert

@@ -12,4 +12,4 @@ void main() {
     direction = position;
     vec4 pos = projection * view * vec4(position, 1.0);
     gl_Position = pos.xyww;
-} 
+}

core/Cargo.lock

@@ -0,0 +1,120 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "ahash"
+version = "0.8.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a15f179cd60c4584b8a8c596927aadc462e27f2ca70c04e0071964a73ba7a75"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9555578bc9e57714c812a1f84e4fc5b4d21fcb063490c624de019f7464c91268"
+
+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+dependencies = [
+ "ahash",
+]
+
+[[package]]
+name = "hecs"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1cbc675ee8d97b4d206a985137f8ad59666538f56f906474f554467a63c776d"
+dependencies = [
+ "hashbrown",
+ "spin",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02b3e5e68a3a1a02aad3ec490a98007cbc13c37cbe84a3cd7b8e406d76e7f778"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1885c039570dc00dcb4ff087a89e185fd56bae234ddc7f056a945bf36467248d"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "raidillon_core"
+version = "0.1.0"
+dependencies = [
+ "hecs",
+]
+
+[[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+
+[[package]]
+name = "syn"
+version = "2.0.104"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17b6f705963418cdb9927482fa304bc562ece2fdd4f616084c50b7023b435a40"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
+
+[[package]]
+name = "version_check"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "zerocopy"
+version = "0.8.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1039dd0d3c310cf05de012d8a39ff557cb0d23087fd44cad61df08fc31907a2f"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ecf5b4cc5364572d7f4c329661bcc82724222973f2cab6f050a4e5c22f75181"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]

core/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "raidillon_core"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+hecs = "0.10.5"
+indexmap = "2.10.0"
+raidillon_assets = { path = "../asset" }
+winit = "0.30.12"
+egui = "0.33.2"

core/src/egui_queue.rs

@@ -0,0 +1,22 @@
+pub struct EguiQueue {
+    pub queue_vec: Vec<Box<dyn FnOnce(&egui::Context) + Send>>,
+}
+
+impl EguiQueue {
+    pub fn new() -> Self {
+        Self { queue_vec: Vec::new() }
+    }
+
+    pub fn queue(&mut self, func: impl FnOnce(&egui::Context) + Send + 'static) {
+        self.queue_vec.push(Box::new(func));
+    }
+
+    pub fn clear(&mut self) {
+        self.queue_vec.clear()
+    }
+
+    pub fn run(&mut self, ctx: &egui::Context) {
+        self.queue_vec.drain(..).for_each(|func| func(ctx));
+        self.clear();
+    }
+}

core/src/engine.rs

@@ -0,0 +1,12 @@
+use crate::scene::Scene;
+
+pub trait EngineTrait {
+    type PlatformCtx: Clone;
+    fn new() -> Self;
+    fn initialize(&mut self, platform_context: Self::PlatformCtx);
+    fn frame_update(&mut self, platform_context: Self::PlatformCtx);
+    fn fixed_update(&mut self, platform_context: Self::PlatformCtx);
+    fn handle_event(&mut self, platform_context: Self::PlatformCtx);
+    fn current_scene_mut(&mut self) -> &mut Scene;
+    fn current_scene(&self) -> &Scene;
+}

core/src/lib.rs

@@ -0,0 +1,7 @@
+pub mod engine;
+pub mod time;
+pub mod utils;
+pub mod scene;
+mod egui_queue;
+
+pub use egui_queue::EguiQueue;

core/src/scene.rs

@@ -0,0 +1,85 @@
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use crate::{define_typemap};
+
+pub struct Scene {
+    pub title: String,
+    pub world: hecs::World,
+    pub skybox_texture_path: Option<PathBuf>,
+    pub resources: SceneResources,
+}
+
+define_typemap!(SceneResources,);
+
+impl Scene {
+    pub fn new(title: String, skybox_texture_path: Option<PathBuf>) -> Self {
+        let mut s = Self {
+            title,
+            world: hecs::World::new(),
+            skybox_texture_path,
+            resources: SceneResources::new(),
+        };
+        s.load_default_resources();
+        s
+    }
+
+    pub fn load_default_resources(&mut self) {}
+}
+
+impl Scene {}
+
+impl AsRef<Scene> for Scene {
+    fn as_ref(&self) -> &Scene {
+        &self
+    }
+}
+
+impl AsMut<Scene> for Scene {
+    fn as_mut(&mut self) -> &mut Scene {
+        self
+    }
+}
+
+pub type SceneID = &'static str;
+
+pub struct SceneManager {
+    scenes: HashMap<SceneID, Scene>,
+    active_scene: Option<SceneID>,
+}
+
+impl SceneManager {
+    pub fn new() -> Self {
+        let scenes = HashMap::new();
+        Self {
+            scenes,
+            active_scene: None,
+        }
+    }
+
+    pub fn current(&self) -> &Scene {
+        match &self.active_scene {
+            Some(id) => self.scenes[id].as_ref(),
+            None => panic!("No active scene"),
+        }
+
+    }
+
+    pub fn current_mut(&mut self) -> &mut Scene {
+        match &mut self.active_scene {
+            Some(id) => self.scenes.get_mut(id).unwrap().as_mut(),
+            None => panic!("No active scene"),
+        }
+    }
+
+    pub fn set_active_scene(&mut self, scene: SceneID) {
+        self.active_scene = Some(scene);
+    }
+
+    pub fn add_scene(&mut self, id: SceneID, scene: Scene) {
+        self.scenes.insert(id, scene);
+    }
+
+    pub fn remove_scene(&mut self, id: SceneID) {
+        self.scenes.remove(&id);
+    }
+}

core/src/time.rs

@@ -0,0 +1,144 @@
+use std::thread;
+use std::time::{Duration, Instant};
+
+#[derive(Clone, Debug)]
+pub struct Config {
+    pub target_frame_hz: Option<f64>,
+    pub target_update_hz: f64,
+    pub max_updates_per_frame: u32,
+    pub max_accumulated_steps: u32,
+    pub sleep_tolerance: Duration,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            target_frame_hz: Some(144.0),
+            target_update_hz: 60.0,
+            max_updates_per_frame: 5,
+            max_accumulated_steps: 8,
+            sleep_tolerance: Duration::from_micros(500),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Time {
+    cfg: Config,
+    last_instant: Instant,
+    next_frame_due: Instant,
+    frame_interval: Option<Duration>,
+    fixed_dt: Duration,
+
+    // tracking
+    frame_dt: Duration,
+    accumulator: Duration,
+
+    // counters
+    pub frame_count: u64,
+    pub update_count: u64,
+}
+
+pub struct TickPlan {
+    /// How many fixed updates to run this frame
+    pub updates: u32,
+    /// Interpolation factor for rendering between previous/next sim states
+    pub alpha: f32,
+    /// Measured last frame delta (seconds)
+    pub frame_dt: f32,
+    /// Fixed timestep (seconds)
+    pub fixed_dt: f32,
+}
+
+impl Time {
+    pub fn new(cfg: Config) -> Self {
+        let now = Instant::now();
+        let frame_interval = cfg.target_frame_hz.map(|hz| Duration::from_secs_f64(1.0 / hz));
+        let fixed_dt = Duration::from_secs_f64(1.0 / cfg.target_update_hz);
+        Self {
+            cfg,
+            last_instant: now,
+            next_frame_due: now,
+            frame_interval,
+            fixed_dt,
+            frame_dt: Duration::ZERO,
+            accumulator: Duration::ZERO,
+            frame_count: 0,
+            update_count: 0,
+        }
+    }
+
+    pub fn reconfigure(&mut self, cfg: Config) {
+        self.cfg = cfg.clone();
+        self.frame_interval = cfg.target_frame_hz.map(|hz| Duration::from_secs_f64(1.0 / hz));
+        self.fixed_dt = Duration::from_secs_f64(1.0 / cfg.target_update_hz);
+    }
+
+    pub fn begin_frame_blocking(&mut self) -> TickPlan {
+        // 1) If there's a frame cap, block until next frame deadline
+        if let Some(interval) = self.frame_interval {
+            let mut now = Instant::now();
+            if now < self.next_frame_due {
+                // Sleep most of the remainder, then spin the last tiny bit for precision
+                let total_remaining = self.next_frame_due - now;
+                if total_remaining > self.cfg.sleep_tolerance {
+                    let sleep_for = total_remaining - self.cfg.sleep_tolerance;
+                    thread::sleep(sleep_for);
+                }
+                // Short spin-wait for precision
+                while Instant::now() < self.next_frame_due {
+                    std::hint::spin_loop();
+                }
+                now = self.next_frame_due;
+            }
+            self.next_frame_due = self.next_frame_due + interval;
+            // In case we fell far behind (e.g., debugger pause), resync.
+            if self.next_frame_due < now {
+                self.next_frame_due = now + interval;
+            }
+        }
+
+        // 2) Measure frame dt
+        let now = Instant::now();
+        self.frame_dt = now.saturating_duration_since(self.last_instant);
+        self.last_instant = now;
+        self.frame_count += 1;
+
+        // 3) Accumulate for fixed updates
+        self.accumulator += self.frame_dt;
+
+        // Clamp accumulator to avoid doing a huge number of updates after a stall
+        let max_accumulated = self.fixed_dt * self.cfg.max_accumulated_steps;
+        if self.accumulator > max_accumulated {
+            self.accumulator = max_accumulated;
+        }
+
+        // 4) Determine how many updates to run this frame
+        let mut updates = 0u32;
+        while self.accumulator >= self.fixed_dt && updates < self.cfg.max_updates_per_frame {
+            self.accumulator -= self.fixed_dt;
+            updates += 1;
+            self.update_count += 1;
+        }
+
+        // 5) Compute interpolation factor for rendering (0..1)
+        let alpha = if self.fixed_dt.is_zero() {
+            1.0
+        } else {
+            (self.accumulator.as_secs_f32() / self.fixed_dt.as_secs_f32()).clamp(0.0, 1.0)
+        };
+
+        TickPlan {
+            updates,
+            alpha,
+            frame_dt: self.frame_dt.as_secs_f32(),
+            fixed_dt: self.fixed_dt.as_secs_f32(),
+        }
+    }
+
+    pub fn frame_dt_seconds(&self) -> f32 { self.frame_dt.as_secs_f32() }
+    pub fn fixed_dt_seconds(&self) -> f32 { self.fixed_dt.as_secs_f32() }
+    pub fn alpha(&self) -> f32 {
+        if self.fixed_dt.is_zero() { 1.0 } else { (self.accumulator.as_secs_f32() / self.fixed_dt.as_secs_f32()).clamp(0.0, 1.0) }
+    }
+}

core/src/utils/managers.rs

@@ -0,0 +1,44 @@
+/// Unused as of now.
+#[macro_export]
+macro_rules! create_manager {
+    ($manager_name:ident, $trait_name:ident) => {
+        pub struct $manager_name {
+            systems: ::indexmap::IndexMap<::std::any::TypeId, Box<dyn $trait_name>>,
+        }
+
+        impl $manager_name {
+            pub fn new() -> Self {
+                Self {
+                    systems: ::indexmap::IndexMap::default(),
+                }
+            }
+
+            pub fn add<S: $trait_name + Default + 'static>(&mut self) {
+                self.systems
+                    .insert(::std::any::TypeId::of::<S>(), Box::new(S::default()));
+            }
+
+            pub fn remove<S: 'static>(&mut self) {
+                self.systems.shift_remove(&::std::any::TypeId::of::<S>());
+            }
+
+            pub fn for_each_value<F>(&self, mut f: F)
+            where
+                F: FnMut(&dyn $trait_name),
+            {
+                for value in self.systems.values() {
+                    f(value.as_ref());
+                }
+            }
+
+            pub fn for_each_value_mut<F>(&mut self, mut f: F)
+            where
+                F: FnMut(&mut dyn $trait_name),
+            {
+                for value in self.systems.values_mut() {
+                    f(value.as_mut());
+                }
+            }
+        }
+    };
+}

core/src/utils/mod.rs

@@ -0,0 +1,2 @@
+pub mod typemap;
+mod managers;

core/src/utils/typemap.rs

@@ -0,0 +1,544 @@
+#[macro_export]
+macro_rules! define_typemap {
+    ($name:ident, $($trait_bound:tt)*) => {
+        pub struct $name {
+            map: std::collections::HashMap<std::any::TypeId, Box<dyn std::any::Any>>,
+        }
+
+        impl $name {
+            pub fn new() -> Self {
+                Self { map: std::collections::HashMap::new() }
+            }
+
+            pub fn insert<T>(&mut self, value: T) -> Option<Box<T>>
+            where
+                T: std::any::Any + 'static + $($trait_bound)*,
+            {
+                let type_id = std::any::TypeId::of::<T>();
+                self.map.insert(type_id, Box::new(value)).and_then(|b| b.downcast().ok())
+            }
+
+            pub fn get<T>(&self) -> Option<&T>
+            where
+                T: std::any::Any + 'static + $($trait_bound)*,
+            {
+                self.map.get(&std::any::TypeId::of::<T>())?.downcast_ref::<T>()
+            }
+
+            pub fn get_mut<T>(&mut self) -> Option<&mut T>
+            where
+                T: std::any::Any + 'static + $($trait_bound)*,
+            {
+                self.map.get_mut(&std::any::TypeId::of::<T>())?.downcast_mut::<T>()
+            }
+
+            pub fn remove<T>(&mut self) -> Option<Box<T>>
+            where
+                T: std::any::Any + 'static + $($trait_bound)*,
+            {
+                self.map.remove(&std::any::TypeId::of::<T>())?.downcast().ok()
+            }
+
+            pub fn len(&self) -> usize { self.map.len() }
+            pub fn is_empty(&self) -> bool { self.map.is_empty() }
+            pub fn clear(&mut self) { self.map.clear(); }
+
+            pub fn contains<T>(&self) -> bool
+            where
+                T: std::any::Any + 'static + $($trait_bound)*,
+            {
+                self.map.contains_key(&std::any::TypeId::of::<T>())
+            }
+
+            // --- tuple-based multi-get API ---
+            pub fn get_many<'a, T>(&'a self) -> Option<<T as __tm_get::GetTuple>::Output<'a>>
+            where
+                T: __tm_get::GetTuple,
+            {
+                <T as __tm_get::GetTuple>::get_from(&self.map)
+            }
+
+            pub fn get_many_mut<'a, T>(&'a mut self) -> Option<<T as __tm_get::GetTupleMut>::Output<'a>>
+            where
+                T: __tm_get::GetTupleMut,
+            {
+                <T as __tm_get::GetTupleMut>::get_from_mut(&mut self.map)
+            }
+        }
+
+        impl Default for $name { fn default() -> Self { Self::new() } }
+
+        // Put helper traits/impls in a private module to avoid name clashes.
+        mod __tm_get {
+            use std::any::{Any, TypeId};
+            use std::collections::HashMap;
+
+            pub trait GetTuple {
+                type Output<'a>;
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>>;
+            }
+
+            pub trait GetTupleMut {
+                type Output<'a>;
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>>;
+            }
+
+            // Manual implementations for arities 1..=8.
+            impl<A> GetTuple for (A,)
+            where
+                A: Any + 'static,
+            {
+                type Output<'a> = (&'a A,);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    Some((a,))
+                }
+            }
+
+            impl<A> GetTupleMut for (A,)
+            where
+                A: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A,);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        Some((a,))
+                    }
+                }
+            }
+
+            impl<A, B> GetTuple for (A, B)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+            {
+                type Output<'a> = (&'a A, &'a B);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>()];
+                    if ids[0] == ids[1] { return None; }
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    let b = map.get(&TypeId::of::<B>())?.downcast_ref::<B>()?;
+                    Some((a, b))
+                }
+            }
+
+            impl<A, B> GetTupleMut for (A, B)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A, &'a mut B);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>()];
+                    if ids[0] == ids[1] { return None; }
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_b = { map.get_mut(&TypeId::of::<B>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        let b = (&mut *ptr_b).downcast_mut::<B>()?;
+                        Some((a, b))
+                    }
+                }
+            }
+
+            impl<A, B, C> GetTuple for (A, B, C)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+            {
+                type Output<'a> = (&'a A, &'a B, &'a C);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>()];
+                    if ids[0] == ids[1] || ids[0] == ids[2] || ids[1] == ids[2] { return None; }
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    let b = map.get(&TypeId::of::<B>())?.downcast_ref::<B>()?;
+                    let c = map.get(&TypeId::of::<C>())?.downcast_ref::<C>()?;
+                    Some((a, b, c))
+                }
+            }
+
+            impl<A, B, C> GetTupleMut for (A, B, C)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A, &'a mut B, &'a mut C);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>()];
+                    if ids[0] == ids[1] || ids[0] == ids[2] || ids[1] == ids[2] { return None; }
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_b = { map.get_mut(&TypeId::of::<B>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_c = { map.get_mut(&TypeId::of::<C>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        let b = (&mut *ptr_b).downcast_mut::<B>()?;
+                        let c = (&mut *ptr_c).downcast_mut::<C>()?;
+                        Some((a, b, c))
+                    }
+                }
+            }
+
+            impl<A, B, C, D> GetTuple for (A, B, C, D)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+            {
+                type Output<'a> = (&'a A, &'a B, &'a C, &'a D);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    let b = map.get(&TypeId::of::<B>())?.downcast_ref::<B>()?;
+                    let c = map.get(&TypeId::of::<C>())?.downcast_ref::<C>()?;
+                    let d = map.get(&TypeId::of::<D>())?.downcast_ref::<D>()?;
+                    Some((a, b, c, d))
+                }
+            }
+
+            impl<A, B, C, D> GetTupleMut for (A, B, C, D)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A, &'a mut B, &'a mut C, &'a mut D);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_b = { map.get_mut(&TypeId::of::<B>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_c = { map.get_mut(&TypeId::of::<C>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_d = { map.get_mut(&TypeId::of::<D>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        let b = (&mut *ptr_b).downcast_mut::<B>()?;
+                        let c = (&mut *ptr_c).downcast_mut::<C>()?;
+                        let d = (&mut *ptr_d).downcast_mut::<D>()?;
+                        Some((a, b, c, d))
+                    }
+                }
+            }
+
+            impl<A, B, C, D, E> GetTuple for (A, B, C, D, E)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+            {
+                type Output<'a> = (&'a A, &'a B, &'a C, &'a D, &'a E);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    let b = map.get(&TypeId::of::<B>())?.downcast_ref::<B>()?;
+                    let c = map.get(&TypeId::of::<C>())?.downcast_ref::<C>()?;
+                    let d = map.get(&TypeId::of::<D>())?.downcast_ref::<D>()?;
+                    let e = map.get(&TypeId::of::<E>())?.downcast_ref::<E>()?;
+                    Some((a, b, c, d, e))
+                }
+            }
+
+            impl<A, B, C, D, E> GetTupleMut for (A, B, C, D, E)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A, &'a mut B, &'a mut C, &'a mut D, &'a mut E);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_b = { map.get_mut(&TypeId::of::<B>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_c = { map.get_mut(&TypeId::of::<C>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_d = { map.get_mut(&TypeId::of::<D>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_e = { map.get_mut(&TypeId::of::<E>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        let b = (&mut *ptr_b).downcast_mut::<B>()?;
+                        let c = (&mut *ptr_c).downcast_mut::<C>()?;
+                        let d = (&mut *ptr_d).downcast_mut::<D>()?;
+                        let e = (&mut *ptr_e).downcast_mut::<E>()?;
+                        Some((a, b, c, d, e))
+                    }
+                }
+            }
+
+            impl<A, B, C, D, E, F> GetTuple for (A, B, C, D, E, F)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+                F: Any + 'static,
+            {
+                type Output<'a> = (&'a A, &'a B, &'a C, &'a D, &'a E, &'a F);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>(), TypeId::of::<F>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    let b = map.get(&TypeId::of::<B>())?.downcast_ref::<B>()?;
+                    let c = map.get(&TypeId::of::<C>())?.downcast_ref::<C>()?;
+                    let d = map.get(&TypeId::of::<D>())?.downcast_ref::<D>()?;
+                    let e = map.get(&TypeId::of::<E>())?.downcast_ref::<E>()?;
+                    let f = map.get(&TypeId::of::<F>())?.downcast_ref::<F>()?;
+                    Some((a, b, c, d, e, f))
+                }
+            }
+
+            impl<A, B, C, D, E, F> GetTupleMut for (A, B, C, D, E, F)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+                F: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A, &'a mut B, &'a mut C, &'a mut D, &'a mut E, &'a mut F);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>(), TypeId::of::<F>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_b = { map.get_mut(&TypeId::of::<B>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_c = { map.get_mut(&TypeId::of::<C>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_d = { map.get_mut(&TypeId::of::<D>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_e = { map.get_mut(&TypeId::of::<E>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_f = { map.get_mut(&TypeId::of::<F>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        let b = (&mut *ptr_b).downcast_mut::<B>()?;
+                        let c = (&mut *ptr_c).downcast_mut::<C>()?;
+                        let d = (&mut *ptr_d).downcast_mut::<D>()?;
+                        let e = (&mut *ptr_e).downcast_mut::<E>()?;
+                        let f = (&mut *ptr_f).downcast_mut::<F>()?;
+                        Some((a, b, c, d, e, f))
+                    }
+                }
+            }
+
+            impl<A, B, C, D, E, F, G> GetTuple for (A, B, C, D, E, F, G)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+                F: Any + 'static,
+                G: Any + 'static,
+            {
+                type Output<'a> = (&'a A, &'a B, &'a C, &'a D, &'a E, &'a F, &'a G);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>(), TypeId::of::<F>(), TypeId::of::<G>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    let b = map.get(&TypeId::of::<B>())?.downcast_ref::<B>()?;
+                    let c = map.get(&TypeId::of::<C>())?.downcast_ref::<C>()?;
+                    let d = map.get(&TypeId::of::<D>())?.downcast_ref::<D>()?;
+                    let e = map.get(&TypeId::of::<E>())?.downcast_ref::<E>()?;
+                    let f = map.get(&TypeId::of::<F>())?.downcast_ref::<F>()?;
+                    let g = map.get(&TypeId::of::<G>())?.downcast_ref::<G>()?;
+                    Some((a, b, c, d, e, f, g))
+                }
+            }
+
+            impl<A, B, C, D, E, F, G> GetTupleMut for (A, B, C, D, E, F, G)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+                F: Any + 'static,
+                G: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A, &'a mut B, &'a mut C, &'a mut D, &'a mut E, &'a mut F, &'a mut G);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>(), TypeId::of::<F>(), TypeId::of::<G>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_b = { map.get_mut(&TypeId::of::<B>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_c = { map.get_mut(&TypeId::of::<C>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_d = { map.get_mut(&TypeId::of::<D>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_e = { map.get_mut(&TypeId::of::<E>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_f = { map.get_mut(&TypeId::of::<F>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_g = { map.get_mut(&TypeId::of::<G>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        let b = (&mut *ptr_b).downcast_mut::<B>()?;
+                        let c = (&mut *ptr_c).downcast_mut::<C>()?;
+                        let d = (&mut *ptr_d).downcast_mut::<D>()?;
+                        let e = (&mut *ptr_e).downcast_mut::<E>()?;
+                        let f = (&mut *ptr_f).downcast_mut::<F>()?;
+                        let g = (&mut *ptr_g).downcast_mut::<G>()?;
+                        Some((a, b, c, d, e, f, g))
+                    }
+                }
+            }
+
+            impl<A, B, C, D, E, F, G, H> GetTuple for (A, B, C, D, E, F, G, H)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+                F: Any + 'static,
+                G: Any + 'static,
+                H: Any + 'static,
+            {
+                type Output<'a> = (&'a A, &'a B, &'a C, &'a D, &'a E, &'a F, &'a G, &'a H);
+                fn get_from<'a>(map: &'a HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>(), TypeId::of::<F>(), TypeId::of::<G>(), TypeId::of::<H>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let a = map.get(&TypeId::of::<A>())?.downcast_ref::<A>()?;
+                    let b = map.get(&TypeId::of::<B>())?.downcast_ref::<B>()?;
+                    let c = map.get(&TypeId::of::<C>())?.downcast_ref::<C>()?;
+                    let d = map.get(&TypeId::of::<D>())?.downcast_ref::<D>()?;
+                    let e = map.get(&TypeId::of::<E>())?.downcast_ref::<E>()?;
+                    let f = map.get(&TypeId::of::<F>())?.downcast_ref::<F>()?;
+                    let g = map.get(&TypeId::of::<G>())?.downcast_ref::<G>()?;
+                    let h = map.get(&TypeId::of::<H>())?.downcast_ref::<H>()?;
+                    Some((a, b, c, d, e, f, g, h))
+                }
+            }
+
+            impl<A, B, C, D, E, F, G, H> GetTupleMut for (A, B, C, D, E, F, G, H)
+            where
+                A: Any + 'static,
+                B: Any + 'static,
+                C: Any + 'static,
+                D: Any + 'static,
+                E: Any + 'static,
+                F: Any + 'static,
+                G: Any + 'static,
+                H: Any + 'static,
+            {
+                type Output<'a> = (&'a mut A, &'a mut B, &'a mut C, &'a mut D, &'a mut E, &'a mut F, &'a mut G, &'a mut H);
+                fn get_from_mut<'a>(map: &'a mut HashMap<TypeId, Box<dyn Any>>) -> Option<Self::Output<'a>> {
+                    let ids = [TypeId::of::<A>(), TypeId::of::<B>(), TypeId::of::<C>(), TypeId::of::<D>(), TypeId::of::<E>(), TypeId::of::<F>(), TypeId::of::<G>(), TypeId::of::<H>()];
+                    for i in 0..ids.len() { for j in (i+1)..ids.len() { if ids[i] == ids[j] { return None; } } }
+                    let ptr_a = { map.get_mut(&TypeId::of::<A>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_b = { map.get_mut(&TypeId::of::<B>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_c = { map.get_mut(&TypeId::of::<C>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_d = { map.get_mut(&TypeId::of::<D>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_e = { map.get_mut(&TypeId::of::<E>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_f = { map.get_mut(&TypeId::of::<F>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_g = { map.get_mut(&TypeId::of::<G>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    let ptr_h = { map.get_mut(&TypeId::of::<H>()).map(|v| v.as_mut() as *mut dyn Any) }?;
+                    unsafe {
+                        let a = (&mut *ptr_a).downcast_mut::<A>()?;
+                        let b = (&mut *ptr_b).downcast_mut::<B>()?;
+                        let c = (&mut *ptr_c).downcast_mut::<C>()?;
+                        let d = (&mut *ptr_d).downcast_mut::<D>()?;
+                        let e = (&mut *ptr_e).downcast_mut::<E>()?;
+                        let f = (&mut *ptr_f).downcast_mut::<F>()?;
+                        let g = (&mut *ptr_g).downcast_mut::<G>()?;
+                        let h = (&mut *ptr_h).downcast_mut::<H>()?;
+                        Some((a, b, c, d, e, f, g, h))
+                    }
+                }
+            }
+        }
+    };
+}
+
+// pub struct TypeMap {
+//     map: HashMap<TypeId, Box<dyn Any>>,
+// }
+//
+// impl TypeMap {
+//     pub fn new() -> Self {
+//         Self {
+//             map: HashMap::new(),
+//         }
+//     }
+//
+//     pub fn insert<T: Any + 'static>(&mut self, value: T) -> Option<Box<T>> {
+//         let type_id = TypeId::of::<T>();
+//         self.map
+//             .insert(type_id, Box::new(value))
+//             .and_then(|boxed| boxed.downcast().ok())
+//     }
+//
+//     pub fn get<T>(&self) -> Option<&T>
+//     where
+//         T: Any + 'static,
+//     {
+//         self.map.get(&TypeId::of::<T>())
+//             .and_then(|any| any.downcast_ref::<T>())
+//     }
+//
+//     pub fn get_mut<T>(&mut self) -> Option<&mut T>
+//     where
+//         T: Any + 'static,
+//     {
+//         self.map.get_mut(&TypeId::of::<T>()).and_then(|any| any.downcast_mut::<T>())
+//     }
+//
+//     pub fn remove<T: Any>(&mut self) -> Option<Box<T>> {
+//         unimplemented!()
+//     }
+// }
+//
+// impl Default for TypeMap {
+//     fn default() -> Self {
+//         Self::new()
+//     }
+// }
+
+#[cfg(test)]
+mod tests {
+    use crate::define_typemap;
+
+    define_typemap!(TestMap,);
+
+    #[test]
+    fn get_test() {
+        let mut tm = TestMap::new();
+        tm.insert::<u32>(42);
+        let v = tm.get::<u32>().expect("value should be present");
+        assert_eq!(*v, 42);
+    }
+
+    #[test]
+    fn get_many_test() {
+        let mut tm = TestMap::new();
+        tm.insert::<u32>(1);
+        tm.insert::<i32>(-2);
+        tm.insert::<f32>(3.5);
+
+        let (a, b, c) = tm
+            .get_many::<(u32, i32, f32)>()
+            .expect("all values should be present");
+        assert_eq!((*a, *b, *c), (1, -2, 3.5));
+    }
+
+    #[test]
+    fn get_many_mut_test() {
+        let mut tm = TestMap::new();
+
+        tm.insert::<i32>(-2);
+        tm.insert::<u32>(1);
+        tm.insert::<f32>(3.5);
+
+        let (a, b, c) = tm
+            .get_many_mut::<(i32, u32, f32)>()
+            .expect("all values should be present");
+        *a = 4;
+        *b = 5;
+        *c = 6.5;
+    }
+}

ecs/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "raidillon_ecs"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+glam = "0.30.5"
+raidillon_assets = { path = "../asset" }
+rapier3d = "0.30.1"

ecs/src/components.rs

@@ -0,0 +1,30 @@
+use glam::{Vec3, Quat, Mat4};
+pub use raidillon_assets::ModelID;
+
+#[derive(Copy, Clone)]
+pub struct Transform {
+    pub translation: Vec3,
+    pub rotation:    Quat,
+    pub scale:       Vec3,
+}
+
+impl Transform {
+    pub fn matrix(&self) -> Mat4 {
+        Mat4::from_scale_rotation_translation(self.scale, self.rotation, self.translation)
+    }
+}
+
+pub struct ModelHandle(pub ModelID);
+
+#[derive(Copy, Clone)]
+pub struct RigidBodyComponent(pub rapier3d::dynamics::RigidBodyHandle);
+
+#[derive(Copy, Clone)]
+pub struct CharacterBodyComponent(pub rapier3d::dynamics::RigidBodyHandle);
+
+#[derive(Debug, Default, PartialEq, Eq, Clone, Copy)]
+pub enum CameraMode {
+    #[default]
+    Kinematic,
+    Debug,
+}

ecs/src/lib.rs

@@ -0,0 +1,3 @@
+pub mod components;
+
+pub use components::{Transform, ModelID};

engine/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "raidillon_engine"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+raidillon_assets = { path = "../asset" }
+raidillon_core = { path = "../core" }
+raidillon_platform = { path = "../platform" }
+raidillon_ecs = { path = "../ecs" }
+winit = "0.30.12"
+hecs = "0.10.5"
+indexmap = "2.10.0"
+glam = "0.30.8"
+egui = "0.33.2"

engine/src/engine.rs

@@ -0,0 +1,88 @@
+use std::cell::RefCell;
+use std::rc::Rc;
+use raidillon_core::scene::{Scene, SceneManager};
+use crate::system::{SystemContext, SystemManager};
+use raidillon_platform::PlatformContext;
+use raidillon_core::{define_typemap};
+use raidillon_core::engine::EngineTrait;
+use crate::input::InputState;
+use crate::resources::EngineResources;
+
+pub struct Engine {
+    pub scene_manager: SceneManager,
+    pub system_manager: SystemManager,
+    pub resources: EngineResources,
+}
+
+impl Engine {
+    fn load_default_resources(&mut self) {
+        let input = InputState::default();
+        self.resources.insert(input);
+    }
+}
+
+impl EngineTrait for Engine {
+    type PlatformCtx = PlatformContext;
+    fn new() -> Self {
+        let scene_manager = SceneManager::new();
+        let system_manager = SystemManager::new();
+        let mut s = Self {
+            scene_manager,
+            system_manager,
+            resources: EngineResources::new(),
+        };
+        s.load_default_resources();
+        s
+    }
+
+    /// Initialize systems, load the world.
+    fn initialize(&mut self, platform_context: PlatformContext) {
+        // Engine Loading Stage 1: initialize systems
+        for system in self.system_manager.systems.values_mut() {
+            system.initialize();
+        }
+        self.resources.insert(platform_context);
+        // Engine Loading Stage 2: load world
+        for system in self.system_manager.systems.values_mut() {
+            system.load_world(&mut self.resources, &mut self.scene_manager.current_mut());
+        }
+    }
+
+    /// Update the engine
+    fn frame_update(&mut self, platform_context: PlatformContext) {
+        self.resources.insert(platform_context);
+
+        for system in self.system_manager.systems.values_mut() {
+            system.frame_update(&mut self.resources, &mut self.scene_manager.current_mut());
+        }
+    }
+
+    fn fixed_update(&mut self, platform_context: PlatformContext) {
+        self.resources.insert(platform_context);
+        for system in self.system_manager.systems.values_mut() {
+            system.fixed_update(&mut self.resources, &mut self.scene_manager.current_mut());
+        }
+    }
+
+    fn handle_event(&mut self, platform_context: PlatformContext) {
+        self.resources.get_mut::<InputState>().unwrap().handle_event(&platform_context.current_event);
+        self.resources.insert(platform_context);
+        for system in self.system_manager.systems.values_mut() {
+            system.handle_event(&mut self.resources, &mut self.scene_manager.current_mut());
+        }
+    }
+
+    // pub fn build_system_context(&mut self) -> SystemContext {
+    //     SystemContext {
+    //         scene: self.scene_manager.current_mut(),
+    //     }
+    // }
+
+    fn current_scene_mut(&mut self) -> &mut Scene {
+        self.scene_manager.current_mut()
+    }
+
+    fn current_scene(&self) -> &Scene {
+        self.scene_manager.current()
+    }
+}

engine/src/input.rs

@@ -0,0 +1,69 @@
+use std::collections::HashSet;
+use winit::event::{ElementState, Event, MouseButton, WindowEvent};
+use winit::keyboard::{KeyCode, PhysicalKey};
+
+/// A utility to help with buffering input.
+/// Meant to be plugged into systems.
+#[derive(Default, Clone, Debug)]
+pub struct InputState {
+    held_keys: HashSet<KeyCode>,
+    held_mouse: HashSet<MouseButton>,
+}
+
+impl InputState {
+    fn new() -> Self {
+        Default::default()
+    }
+
+    pub fn handle_event(&mut self, event: &Event<()>) {
+        if let Event::WindowEvent { event, .. } = event {
+            match event {
+                // Keyboard
+                WindowEvent::KeyboardInput { event: key_event, .. } => {
+                    if let PhysicalKey::Code(code) = key_event.physical_key {
+                        match key_event.state {
+                            ElementState::Pressed => {
+                                self.held_keys.insert(code);
+                            }
+                            ElementState::Released => {
+                                self.held_keys.remove(&code);
+                            }
+                        }
+                    }
+                }
+
+                // Mouse
+                WindowEvent::MouseInput { state, button, .. } => {
+                    match state {
+                        ElementState::Pressed => {
+                            self.held_mouse.insert(*button);
+                        }
+                        ElementState::Released => {
+                            self.held_mouse.remove(button);
+                        }
+                    }
+                }
+
+                WindowEvent::Focused(focused) => {
+                    if !*focused {
+                        self.clear();
+                    }
+                }
+                _ => {}
+            }
+        }
+    }
+
+    pub fn key_held(&self, code: KeyCode) -> bool {
+        self.held_keys.contains(&code)
+    }
+
+    pub fn mouse_held(&self, button: MouseButton) -> bool {
+        self.held_mouse.contains(&button)
+    }
+
+    pub fn clear(&mut self) {
+        self.held_keys.clear();
+        self.held_mouse.clear();
+    }
+}

engine/src/lib.rs

@@ -0,0 +1,9 @@
+pub mod engine;
+pub mod system;
+mod input;
+pub mod systems;
+mod resources;
+
+pub use crate::engine::Engine;
+pub use crate::resources::EngineResources;
+pub use input::InputState;

engine/src/resources.rs

@@ -0,0 +1,3 @@
+use raidillon_core::define_typemap;
+
+define_typemap!(EngineResources,);

engine/src/system.rs

@@ -0,0 +1,45 @@
+use indexmap::IndexMap;
+use raidillon_core::scene::Scene;
+use raidillon_platform::PlatformContext;
+use std::any::TypeId;
+use std::cell::RefCell;
+use std::rc::Rc;
+use crate::input::InputState;
+use crate::resources::EngineResources;
+
+pub struct SystemContext<'a> {
+    pub scene: &'a mut Scene,
+    pub platform_context: PlatformContext,
+    pub input_state: Rc<RefCell<InputState>>,
+}
+
+pub trait System {
+    /// Initialize the system.
+    fn initialize(&mut self) {}
+    /// Spawn the first entities of the world.
+    fn load_world(&mut self, res: &mut EngineResources, scene: &mut Scene) {}
+    fn handle_event(&mut self, res: &mut EngineResources, scene: &mut Scene) {}
+    fn fixed_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {}
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {}
+}
+
+pub struct SystemManager {
+    pub systems: IndexMap<TypeId, Box<dyn System>>,
+}
+
+impl SystemManager {
+    pub fn new() -> Self {
+        Self {
+            systems: IndexMap::default(),
+        }
+    }
+
+    pub fn add<S: System + Default + 'static>(&mut self) {
+        self.systems
+            .insert(TypeId::of::<S>(), Box::new(S::default()));
+    }
+
+    pub fn remove<S: 'static>(&mut self) {
+        self.systems.shift_remove(&TypeId::of::<S>());
+    }
+}

game/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "raidillon_game"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+raidillon_app = { path = "../app", features = ["glium"] }
+glam = "0.30.5"
+winit = "0.30.12"
+rapier3d = "0.30.1"
+hecs = "0.10.5"
+egui = "0.33.2"

game/src/main.rs

@@ -0,0 +1,140 @@
+use raidillon_app::prelude::*;
+
+mod systems;
+use glam::{Quat, Vec3};
+use rapier3d::dynamics::{CoefficientCombineRule, RigidBodyType};
+use rapier3d::prelude::ColliderBuilder;
+use winit::event::{Event, WindowEvent};
+use systems::debug_camera::FPSDebugCameraSystem;
+use crate::systems::common::should_draw_menu;
+use crate::systems::{
+    DisplaySettings, KeybindsSystem, KinematicCharacterController, MenuSystem, PhysicsSystem,
+    PhysicsDebugSystem,
+};
+
+const TEST_GLTF: &str = "checkered-sphere.glb";
+const PLANE_GLTF: &str = "plane.glb";
+const MAIN_SCENE_ID: &str = "main_scene";
+
+#[derive(Default)]
+struct UpdateAspectRatioSystem;
+impl System for UpdateAspectRatioSystem {
+    fn handle_event(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let pctx = res.get::<PlatformContext>().unwrap();
+
+        if let Event::WindowEvent { event: WindowEvent::Resized(sz), .. } =
+            pctx.current_event
+        {
+            scene.world
+                .query_mut::<&mut Camera>()
+                .into_iter()
+                .for_each(|(_, cam)| {
+                    cam.aspect = sz.width as f32 / sz.height as f32;
+                });
+        }
+    }
+}
+
+#[derive(Default)]
+struct MainSystem;
+
+impl System for MainSystem {
+    fn load_world(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let pctx = res.get::<PlatformContext>().expect("PlatformContext missing").clone();
+        let physics = scene.resources.get_mut::<Physics>().expect("Physics missing");
+
+        // Spawn Sphere
+        {
+            let tr = Transform {
+                translation: Vec3::new(0.0, 5.0, 0.0),
+                rotation: Quat::IDENTITY,
+                scale: Vec3::new(1.0, 1.0, 1.0),
+            };
+            let collider = ColliderBuilder::ball(1.0)
+                .restitution(0.7)
+                .restitution_combine_rule(CoefficientCombineRule::Max)
+                .build();
+            let rb_handle = physics.add_rigid_body(RigidBodyType::Dynamic, tr, collider);
+            pctx.asset_manager.borrow_mut().load_gltf(TEST_GLTF, &model_path(TEST_GLTF));
+            scene.world.spawn((
+                tr,
+                ModelHandle(TEST_GLTF),
+                RigidBodyComponent(rb_handle),
+            ));
+        }
+        // Spawn Plane
+        {
+            let tr = Transform {
+                translation: Vec3::new(0.0, 0.0, 0.0),
+                rotation: Quat::IDENTITY,
+                scale: Vec3::new(10.0, 1.0, 10.0),
+            };
+            let collider = ColliderBuilder::cuboid(10.0, 0.01, 10.0).build();
+            let rb_handle = physics.add_rigid_body(RigidBodyType::Fixed, tr, collider);
+            pctx.asset_manager.borrow_mut().load_gltf(PLANE_GLTF, &model_path(PLANE_GLTF));
+            scene.world.spawn((
+                tr,
+                ModelHandle(PLANE_GLTF),
+                RigidBodyComponent(rb_handle),
+            ));
+        }
+
+        scene.world.spawn((Camera {
+            eye:    Vec3::new(0.0, 2.0, 3.0),
+            center: Vec3::ZERO,
+            up:     Vec3::Y,
+            fovy:   60_f32.to_radians(),
+            aspect: pctx.frame_width / pctx.frame_height,
+            znear:  0.1,
+            zfar:   100.0},
+            CameraMode::default(),
+        ));
+    }
+
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let (
+            pctx,
+            input,
+        ) = res.get_many_mut::<(
+            PlatformContext,
+            InputState,
+        )>().unwrap();
+
+        let mut egui_queue = pctx.egui_queue.borrow_mut();
+        let time_ctx = pctx.time_ctx.clone();
+        let mut character_pos = Vec3::ZERO;
+        for (_ent, (tr, ch_component)) in scene.world.query::<(&Transform, &CharacterBodyComponent)>().iter() {
+            character_pos = tr.translation;
+        }
+        egui_queue.queue(move |egui_ctx| {
+            // disable text selection on all labels.
+            egui_ctx.style_mut(|style| {
+                style.interaction.selectable_labels = false;
+            });
+
+            egui::Window::new("Debug").show(egui_ctx, |ui| {
+                ui.label("Hello World!");
+                ui.label(format!("Frame Delta: {:.3}", time_ctx.frame_dt));
+                ui.label(format!("Fixed Delta: {:.3}", time_ctx.fixed_dt));
+                ui.label(format!("FPS: {:.3}", 1.0 / time_ctx.frame_dt));
+                ui.label(format!("Character POS: {character_pos:.3}"));
+            });
+        });
+    }
+}
+
+fn main() {
+    raidillon_app::App::new()
+        .add_system::<PhysicsSystem>()
+        .add_system::<PhysicsDebugSystem>()
+        .add_system::<KeybindsSystem>()
+        .add_system::<KinematicCharacterController>()
+        .add_system::<FPSDebugCameraSystem>()
+        .add_system::<MenuSystem>()
+        .add_system::<DisplaySettings>()
+        .add_system::<MainSystem>()
+        .add_system::<UpdateAspectRatioSystem>()
+        .add_scene(MAIN_SCENE_ID, Scene::new(MAIN_SCENE_ID.to_owned(), None))
+        .set_active_scene(MAIN_SCENE_ID)
+        .run("Raidillon".to_string(), 2560, 1080);
+}

game/src/systems/common.rs

@@ -0,0 +1,34 @@
+use glam::Vec3;
+use raidillon_app::prelude::*;
+use crate::systems::menu::MenuState;
+
+pub fn is_camera_mode_valid(scene: &mut Scene, mode: CameraMode) -> bool {
+    let mut q = scene.world.query::<(&Camera, &CameraMode)>();
+    let (cam_ent, (cam, cam_mode)) = q
+        .iter()
+        .next()
+        .unwrap();
+    *cam_mode == mode
+}
+
+pub fn is_mouse_look_enabled(scene: &mut Scene) -> bool {
+    let mut q = scene.world.query::<(&MenuState)>();
+    let (_ent, mode) = q.iter().next().unwrap();
+    *mode == MenuState::Closed
+}
+
+pub fn camera_front(yaw: f32, pitch: f32) -> Vec3 {
+    let yaw_rad   = yaw.to_radians();
+    let pitch_rad = pitch.to_radians();
+    Vec3::new(
+        yaw_rad.cos() * pitch_rad.cos(),
+        pitch_rad.sin(),
+        yaw_rad.sin() * pitch_rad.cos(),
+    ).normalize()
+}
+
+pub fn should_draw_menu(scene: &mut Scene) -> bool {
+    let mut q = scene.world.query::<(&MenuState)>();
+    let (_ent, mode) = q.iter().next().unwrap();
+    *mode == MenuState::Open
+}

game/src/systems/debug_camera.rs

@@ -0,0 +1,89 @@
+use glam::{Quat, Vec3};
+use winit::event::DeviceEvent::MouseMotion;
+use winit::event::{ElementState, Event, MouseButton, WindowEvent};
+use winit::keyboard::{KeyCode, PhysicalKey};
+use winit::window::CursorGrabMode;
+use raidillon_app::prelude::*;
+
+use crate::systems::common::{camera_front, is_camera_mode_valid, is_mouse_look_enabled};
+use crate::systems::menu::MenuState;
+
+pub struct FPSDebugCameraSystem {
+    mouse_delta: (f64, f64),
+    position: Vec3,
+    yaw:   f32,
+    pitch: f32,
+    speed: f32,
+    sensitivity: f32,
+}
+
+impl Default for FPSDebugCameraSystem {
+    fn default() -> Self {
+        Self {
+            mouse_delta: Default::default(),
+            position: Vec3::new(0.0, 0.0, 2.0),
+            yaw: -90.0,
+            pitch: 0.0,
+            speed: 8.0,
+            sensitivity: 0.1,
+        }
+    }
+}
+
+impl System for FPSDebugCameraSystem {
+    fn handle_event(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        if !(is_camera_mode_valid(scene, CameraMode::Debug) && is_mouse_look_enabled(scene)) {
+            return
+        }
+        let pctx = res.get::<PlatformContext>().unwrap();
+        let event2 = pctx.current_event.clone();
+        match event2 {
+            Event::DeviceEvent { device_id, event} => {
+                match event {
+                    MouseMotion { delta } => {
+                        self.mouse_delta.0 += delta.0;
+                        self.mouse_delta.1 += delta.1;
+                    },
+                    _ => {}
+                }
+            },
+            _ => {},
+        }
+    }
+
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let (pctx, input) = res.get_many::<(PlatformContext, InputState)>().unwrap();
+
+        if is_mouse_look_enabled(scene) {
+            self.yaw += self.mouse_delta.0 as f32 * self.sensitivity;
+            self.pitch -= self.mouse_delta.1 as f32 * self.sensitivity;
+            self.pitch = self.pitch.clamp(-89.0, 89.0);
+        }
+
+        let front = camera_front(self.yaw, self.pitch);
+        let right_vec = front.cross(Vec3::Y).normalize();
+
+        if is_mouse_look_enabled(scene) {
+            if input.key_held(KeyCode::KeyW) {
+                self.position += front * pctx.time_ctx.frame_dt * self.speed;
+            }
+            if input.key_held(KeyCode::KeyS) {
+                self.position -= front * pctx.time_ctx.frame_dt * self.speed;
+            }
+            if input.key_held(KeyCode::KeyA) {
+                self.position -= right_vec * pctx.time_ctx.frame_dt * self.speed;
+            }
+            if input.key_held(KeyCode::KeyD) {
+                self.position += right_vec * pctx.time_ctx.frame_dt * self.speed;
+            }
+        }
+
+        if is_camera_mode_valid(scene, CameraMode::Debug) {
+            scene.world.query_mut::<&mut Camera>().into_iter().for_each(|(_, camera)| {
+                camera.eye = self.position;
+                camera.center = self.position + front;
+            });
+        }
+        self.mouse_delta = (0.0, 0.0);
+    }
+}

game/src/systems/display_settings.rs

@@ -0,0 +1,94 @@
+use std::sync::{Arc, Mutex};
+use raidillon_app::prelude::*;
+use crate::systems::common::should_draw_menu;
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+enum SettingsTab {
+    Display,
+}
+
+impl Default for SettingsTab {
+    fn default() -> Self {
+        SettingsTab::Display
+    }
+}
+
+#[derive(Clone, Default)]
+struct DisplaySettingsUiState {
+    selected_fullscreen_mode: WindowMode,
+    active_tab: SettingsTab,
+}
+
+#[derive(Default)]
+pub struct DisplaySettings {
+    ui_state: Arc<Mutex<DisplaySettingsUiState>>,
+}
+
+impl System for DisplaySettings {
+    fn load_world(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let pctx = res.get_mut::<PlatformContext>().unwrap();
+
+        // sync the settings with UI state once
+        if let (Ok(settings_handle), Ok(mut state)) = (pctx.settings.read(), self.ui_state.lock()) {
+            state.selected_fullscreen_mode = settings_handle.display_settings.fullscreen_mode;
+        }
+    }
+
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        if should_draw_menu(scene) {
+            let pctx = res.get_mut::<PlatformContext>().unwrap();
+            let settings = pctx.settings.clone();
+            let ui_state = self.ui_state.clone();
+
+            pctx.egui_queue.borrow_mut().queue(move |egui_ctx| {
+                egui::Window::new("Settings").default_open(false).show(egui_ctx, |ui| {
+                    let mut state = ui_state.lock().unwrap();
+
+                    ui.horizontal(|ui| {
+                        ui.selectable_value(&mut state.active_tab, SettingsTab::Display, "Display Settings");
+                    });
+                    ui.separator();
+
+                    match state.active_tab {
+                        SettingsTab::Display => {
+                            ui.label("Window Mode");
+                            egui::ComboBox::from_id_salt("window_mode")
+                                .selected_text(window_mode_label(state.selected_fullscreen_mode))
+                                .show_ui(ui, |ui| {
+                                    for mode in [
+                                        WindowMode::Windowed,
+                                        WindowMode::BorderlessFullscreen,
+                                        WindowMode::ExclusiveFullscreen,
+                                    ] {
+                                        ui.selectable_value(
+                                            &mut state.selected_fullscreen_mode,
+                                            mode,
+                                            window_mode_label(mode),
+                                        );
+                                    }
+                                });
+
+                            ui.add_space(8.0);
+                            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                                if ui.button("Apply").clicked() {
+                                    if let Ok(mut settings_handle) = settings.write() {
+                                        settings_handle.display_settings.fullscreen_mode = state.selected_fullscreen_mode;
+                                        settings_handle.display_settings.dirty = true;
+                                    }
+                                }
+                            });
+                        }
+                    }
+                });
+            });
+        }
+    }
+}
+
+fn window_mode_label(mode: WindowMode) -> &'static str {
+    match mode {
+        WindowMode::Windowed => "Windowed",
+        WindowMode::BorderlessFullscreen => "Borderless Fullscreen",
+        WindowMode::ExclusiveFullscreen => "Exclusive Fullscreen",
+    }
+}

game/src/systems/keybinds.rs

@@ -0,0 +1,69 @@
+use winit::keyboard::KeyCode;
+use raidillon_app::prelude::*;
+
+use crate::systems::{common::should_draw_menu, menu::MenuState};
+
+#[derive(Default)]
+pub struct KeybindsSystem {
+    camera_toggle_held: bool,
+}
+
+impl System for KeybindsSystem {
+    fn fixed_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let input = res.get::<InputState>().unwrap();
+        if input.key_held(KeyCode::F5) {
+            if self.camera_toggle_held { return }
+            self.toggle_camera_mode(scene);
+            self.camera_toggle_held = true;
+        } else {
+            self.camera_toggle_held = false;
+        }
+    }
+
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        if should_draw_menu(scene) {
+            let pctx = res.get_mut::<PlatformContext>().unwrap();
+            let mut q = scene.world.query::<(&Camera, &CameraMode)>();
+            let (cam_ent, (cam, cam_mode)) = q
+                .iter()
+                .next()
+                .unwrap();
+            let cam_mode_str = format!("Camera Mode: {:?}", cam_mode);
+
+            let mut q = scene.world.query::<(&MenuState)>();
+            let (_ent, menu_state) = q
+                .iter()
+                .next()
+                .unwrap();
+
+            let menu_state_str = format!("Menu State: {:?}", menu_state);
+
+            pctx.egui_queue.borrow_mut().queue(move |egui_ctx| {
+                egui::Window::new("Camera").show(egui_ctx, |ui| {
+                    ui.label("F5 to switch camera");
+                    ui.label(cam_mode_str);
+                    ui.label(menu_state_str)
+                });
+            });
+        }
+    }
+}
+
+impl KeybindsSystem {
+    fn toggle_camera_mode(&mut self, scene: &mut Scene) {
+        let q = scene.world.query_mut::<(&mut Camera, &mut CameraMode)>();
+        let (cam_ent, (cam, cam_mode)) = q
+            .into_iter()
+            .next()
+            .unwrap();
+
+        match *cam_mode {
+            CameraMode::Kinematic => {
+                *cam_mode = CameraMode::Debug;
+            }
+            CameraMode::Debug => {
+                *cam_mode = CameraMode::Kinematic;
+            }
+        }
+    }
+}

game/src/systems/kinematic_character_controller.rs

@@ -0,0 +1,187 @@
+use glam::{Quat, Vec3};
+use rapier3d::prelude::{nalgebra, ColliderBuilder, QueryFilter, RigidBodyBuilder, RigidBodyType};
+use rapier3d::prelude::vector;
+use rapier3d::control::{CharacterCollision, KinematicCharacterController as RapierKinematicCharacterController};
+use rapier3d::na::{Isometry3, Vector3};
+use winit::event::DeviceEvent::MouseMotion;
+use winit::event::Event;
+use winit::keyboard::KeyCode;
+use raidillon_app::prelude::*;
+
+use crate::systems::common::{camera_front, is_camera_mode_valid, is_mouse_look_enabled};
+use crate::systems::menu::MenuState;
+
+#[derive(Default)]
+pub struct KinematicCharacterController {
+    character_controller: RapierKinematicCharacterController,
+    character_collider: ColliderBuilder,
+
+    desired_movement: Vec3,
+    last_position: Vector3<f32>,
+    yaw:   f32,
+    pitch: f32,
+    speed: f32,
+    sensitivity: f32,
+    mouse_delta: (f64, f64),
+
+    vertical_velocity: f32,
+    gravity: f32,
+    max_fall_speed: f32,
+}
+
+impl System for KinematicCharacterController {
+    fn load_world(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        // create the rigid body, add it to the body set
+        let p = scene.resources.get_mut::<Physics>().expect("Physics missing");
+        let rb = RigidBodyBuilder::kinematic_position_based().build();
+        let rb_handle = p.rigid_body_set.insert(rb);
+        self.character_collider = ColliderBuilder::capsule_y(1.0, 1.0);
+        p.collider_set.insert_with_parent(self.character_collider.build(), rb_handle, &mut p.rigid_body_set);
+        let tr = Transform {
+            translation: Vec3::new(0.0, 2.0, 3.0),
+            rotation: Quat::IDENTITY,
+            scale: Vec3::new(1.0, 1.0, 1.0),
+        };
+        self.last_position = vector![
+            tr.translation.x,
+            tr.translation.y,
+            tr.translation.z,
+        ];
+        scene.world.spawn((
+            tr,
+            CharacterBodyComponent(rb_handle),
+        ));
+
+        self.speed = 5.0;
+        self.sensitivity = 0.05;
+        self.gravity = -9.81;
+        self.max_fall_speed = -50.0;
+        self.vertical_velocity = 0.0;
+    }
+
+    fn handle_event(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        if !is_camera_mode_valid(scene, CameraMode::Kinematic) {
+            return
+        }
+
+        let pctx = res.get::<PlatformContext>().unwrap();
+        let event2 = pctx.current_event.clone();
+        match event2 {
+            Event::DeviceEvent { device_id, event } => {
+                match event {
+                    MouseMotion { delta } => {
+                        self.mouse_delta.0 += delta.0;
+                        self.mouse_delta.1 += delta.1;
+                    },
+                    _ => {}
+                }
+            },
+            _ => {},
+        }
+    }
+
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let front = camera_front(self.yaw, self.pitch);
+        let right_vec = front.cross(Vec3::Y).normalize();
+
+        if is_camera_mode_valid(scene, CameraMode::Kinematic) && is_mouse_look_enabled(scene) {
+            let (pctx, input) = res.get_many::<(PlatformContext, InputState)>().unwrap();
+
+            self.yaw   += (self.mouse_delta.0 as f32) * self.sensitivity;
+            self.pitch -= (self.mouse_delta.1 as f32) * self.sensitivity;
+            self.pitch = self.pitch.clamp(-89.0, 89.0);
+
+            if input.key_held(KeyCode::KeyW) {
+                self.desired_movement += front * pctx.time_ctx.frame_dt * self.speed;
+            }
+            if input.key_held(KeyCode::KeyS) {
+                self.desired_movement -= front * pctx.time_ctx.frame_dt * self.speed;
+            }
+            if input.key_held(KeyCode::KeyA) {
+                self.desired_movement -= right_vec * pctx.time_ctx.frame_dt * self.speed;
+            }
+            if input.key_held(KeyCode::KeyD) {
+                self.desired_movement += right_vec * pctx.time_ctx.frame_dt * self.speed;
+            }
+        }
+
+        if is_camera_mode_valid(scene, CameraMode::Kinematic) {
+            let pos = Physics::rapier_translation_to_glam(&self.last_position);
+
+            scene.world.query_mut::<&mut Camera>().into_iter().for_each(|(_, camera)| {
+                // INTERPOLATION NEEDED.
+                camera.eye = pos;
+                camera.center = pos + front;
+            });
+        }
+
+        self.mouse_delta = (0.0, 0.0);
+    }
+
+    fn fixed_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let p = scene.resources.get_mut::<Physics>().unwrap();
+        let (pctx, input) = res.get_many::<(PlatformContext, InputState)>().unwrap();
+
+        let (ch_ent, (ch_tr, ch_component)) = scene
+            .world
+            .query_mut::<(&mut Transform, &mut CharacterBodyComponent)>()
+            .into_iter()
+            .next()
+            .expect("no character entity in world");
+
+        let query_pipeline = p.broad_phase.as_query_pipeline(
+            p.narrow_phase.query_dispatcher(),
+            &p.rigid_body_set,
+            &p.collider_set,
+            QueryFilter::default().exclude_rigid_body(ch_component.0),
+        );
+
+        self.vertical_velocity = (self.vertical_velocity + self.gravity * pctx.time_ctx.fixed_dt)
+            .max(self.max_fall_speed);
+        let mut total_displacement = self.desired_movement;
+        total_displacement.y += self.vertical_velocity * pctx.time_ctx.fixed_dt;
+
+        let mut collisions: Vec<CharacterCollision> = Vec::new();
+        let corrected_movement = self.character_controller.move_shape(
+            pctx.time_ctx.fixed_dt,
+            &query_pipeline,
+            &*self.character_collider.shape,
+            &Isometry3::from(self.last_position),
+            vector![total_displacement.x, total_displacement.y, total_displacement.z],
+            |collision| collisions.push(collision),
+        );
+
+        // update character rigid body with the new translation.
+        if let Some(body) = p.get_rigid_body_mut(ch_component.0) {
+            self.last_position = vector![
+                self.last_position.x + corrected_movement.translation.x,
+                self.last_position.y + corrected_movement.translation.y,
+                self.last_position.z + corrected_movement.translation.z,
+            ];
+            body.set_next_kinematic_position(Isometry3::from(self.last_position));
+            ch_tr.translation = Physics::rapier_translation_to_glam(&self.last_position);
+            // reset vertical velocity if grounded
+            if corrected_movement.grounded {
+                self.vertical_velocity = 0.0;
+            }
+        }
+
+        // apply impulses to dynamic bodies the character collided with
+        let character_push_force = 50.0;
+        for collision in collisions {
+            if let Some(collider) = p.collider_set.get(collision.handle) {
+                if let Some(rb_handle) = collider.parent() {
+                    if let Some(rb) = p.rigid_body_set.get_mut(rb_handle) {
+                        if rb.body_type() == RigidBodyType::Dynamic {
+                            let push_direction = -collision.hit.normal1.into_inner();
+                            let impulse = push_direction * character_push_force * pctx.time_ctx.fixed_dt;
+                            rb.apply_impulse(impulse, true);
+                        }
+                    }
+                }
+            }
+        }
+
+        self.desired_movement = Vec3::ZERO;
+    }
+}

game/src/systems/menu.rs

@@ -0,0 +1,85 @@
+use egui::Id;
+use raidillon_app::prelude::*;
+use winit::{dpi::{LogicalPosition, Position}, keyboard::KeyCode, window::CursorGrabMode};
+
+#[derive(Default)]
+pub struct MenuSystem {
+    escape_key_held: bool,
+    /// Unoptimal solution to fix windows event delay
+    times_ran_initial_win_event: u32,
+}
+
+#[derive(Default, Eq, PartialEq, Debug)]
+pub enum MenuState {
+    Open,
+    #[default]
+    Closed,
+}
+
+impl System for MenuSystem {
+    fn load_world(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        scene.world.spawn((MenuState::Closed,));
+    }
+
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        // Windows won't register some events in the first miliseconds after initialization
+        if self.times_ran_initial_win_event < 20 {
+            let window = res.get::<PlatformContext>().unwrap().window.lock().unwrap();
+            window.set_cursor_grab(CursorGrabMode::Confined).or_else(|_| window.set_cursor_grab(CursorGrabMode::Locked));
+            window.set_cursor_visible(false);
+            self.times_ran_initial_win_event += 1
+        }
+
+        let mut egui_queue = res.get::<PlatformContext>().unwrap().egui_queue.borrow_mut();
+        egui_queue.queue(|egui_ctx| {
+            egui::Area::new(Id::new("esc to pause"))
+                .anchor(egui::Align2::RIGHT_TOP, [-10.0, 10.0])
+                .show(egui_ctx, |ui| {
+                    ui.label(
+                        egui::RichText::new("ESC to pause").size(24.0).color(egui::Color32::BLACK)
+                    );
+                });
+        });
+    }
+
+
+    fn handle_event(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        // The menu is toggled by pressing the escape key
+        let input = res.get::<InputState>().unwrap();
+        if input.key_held(KeyCode::Escape) {
+            if self.escape_key_held { return }
+            self.toggle_menu(res, scene);
+            self.escape_key_held = true;
+        } else {
+            self.escape_key_held = false;
+        }
+    }
+}
+
+impl MenuSystem {
+    fn toggle_menu(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let q = scene.world.query_mut::<(&mut MenuState)>();
+        let (menu_ent, menu_state) = q
+            .into_iter()
+            .next()
+            .unwrap();
+
+        let pctx = res.get::<PlatformContext>().unwrap();
+        let window = pctx.window.lock().unwrap();
+
+        match *menu_state {
+            MenuState::Open => {
+                *menu_state = MenuState::Closed;
+                window.set_cursor_grab(CursorGrabMode::Confined).or_else(|_| window.set_cursor_grab(CursorGrabMode::Locked));
+                window.set_cursor_visible(false);
+                pctx.should_egui_receive_input_events.set(false);
+            },
+            MenuState::Closed => {
+                *menu_state = MenuState::Open;
+                window.set_cursor_grab(CursorGrabMode::None);
+                window.set_cursor_visible(true);
+                pctx.should_egui_receive_input_events.set(true);
+            },
+        }
+    }
+}

game/src/systems/mod.rs

@@ -0,0 +1,15 @@
+mod physics;
+mod physics_debug;
+mod kinematic_character_controller;
+mod keybinds;
+mod menu;
+pub mod debug_camera;
+pub mod common;
+mod display_settings;
+
+pub use physics::PhysicsSystem;
+pub use physics_debug::PhysicsDebugSystem;
+pub use kinematic_character_controller::KinematicCharacterController;
+pub use keybinds::KeybindsSystem;
+pub use menu::MenuSystem;
+pub use display_settings::DisplaySettings;

game/src/systems/physics.rs

@@ -0,0 +1,30 @@
+use raidillon_app::prelude::*;
+
+/// Do physics calculations and apply to world.
+#[derive(Default)]
+pub struct PhysicsSystem;
+
+impl System for PhysicsSystem {
+    fn load_world(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let p = Physics::default();
+        scene.resources.insert(p);
+    }
+
+    fn fixed_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let pctx = res.get::<PlatformContext>().expect("PlatformContext missing").clone();
+        let physics = scene.resources.get_mut::<Physics>().expect("Physics missing");
+        physics.step(pctx.time_ctx.fixed_dt);
+
+        // apply calculations to dynamic bodies
+        let mut query = scene.world.query::<(&mut Transform, &RigidBodyComponent)>();
+        for (_ent, (tr, rb_component)) in query.iter() {
+            if let Some(body) = physics.get_rigid_body(rb_component.0) {
+                let pos = body.position();
+                let translation = Physics::rapier_translation_to_glam(&pos.translation.vector);
+                let rotation = Physics::rapier_rotation_to_glam(&pos.rotation);
+                tr.translation = translation;
+                tr.rotation = rotation;
+            }
+        }
+    }
+}

game/src/systems/physics_debug.rs

@@ -0,0 +1,35 @@
+use raidillon_app::prelude::*;
+
+/// renders aabb wireframes for all physics colliders
+#[derive(Default)]
+pub struct PhysicsDebugSystem;
+
+impl System for PhysicsDebugSystem {
+    fn frame_update(&mut self, res: &mut EngineResources, scene: &mut Scene) {
+        let pctx = res.get::<PlatformContext>().expect("PlatformContext missing").clone();
+
+        let mut debug_wireframes = pctx.debug_wireframes.borrow_mut();
+        if !debug_wireframes.enabled {
+            return;
+        }
+
+        let physics = match scene.resources.get::<Physics>() {
+            Some(p) => p,
+            None => return,
+        };
+
+        let color = [1.0, 0.0, 0.0, 1.0];
+
+        for (_, collider) in physics.collider_set.iter() {
+            let aabb = collider.compute_aabb();
+            let min = aabb.mins;
+            let max = aabb.maxs;
+
+            debug_wireframes.add_box(
+                [min.x, min.y, min.z],
+                [max.x, max.y, max.z],
+                color,
+            );
+        }
+    }
+}

glium_platform/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "raidillon_glium"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.98"
+glam = "0.30.5"
+glium = { version = "0.36.0", features = ["glutin_backend", "simple_window_builder"] }
+gltf = { version = "1.4.1", features = ["import", "utils", "KHR_texture_transform"] }
+raidillon_platform = { path = "../platform" }
+raidillon_core = { path = "../core" }
+raidillon_assets = { path = "../asset" }
+raidillon_ecs = { path = "../ecs" }
+raidillon_engine = { path = "../engine" }
+winit = "0.30.12"
+indexmap = "2.10.0"
+exr = "1.73.0"
+image = { version = "0.25.8", default-features = false, features = ["exr"] }
+egui = "0.33.2"
+egui_glium = { version = "0.31.1", git = "https://github.com/reo6/egui_glium.git" }

glium_platform/src/assets.rs

@@ -0,0 +1,53 @@
+use std::any::Any;
+use std::cell::RefCell;
+use raidillon_assets::{ModelManagerRef, ModelManager};
+use crate::model::Model;
+use std::path::{Path, PathBuf};
+use crate::gltf_loader::load_gltf;
+use glium::backend::Facade;
+use std::collections::HashMap;
+use std::collections::hash_map::Entry;
+use std::rc::Rc;
+use raidillon_assets::model_manager::ModelID;
+
+/// Glium platform asset manager implementation.
+pub struct GliumAssetManager {
+    pub models: HashMap<ModelID, Vec<Model>>,
+    facade: Box<dyn Facade>,
+}
+
+impl GliumAssetManager {
+    pub fn new(facade: Box<dyn Facade>) -> Self {
+        let models = HashMap::new();
+        Self {
+            models,
+            facade,
+        }
+    }
+}
+
+impl ModelManager for GliumAssetManager {
+    fn load_gltf(&mut self, id: ModelID, path: &Path) {
+        let models = load_gltf(path, self.facade.as_ref()).unwrap();
+        self.models.insert(id, models);
+    }
+
+    fn unload_model(&mut self, id: ModelID) {
+        self.models.remove(&id);
+    }
+
+    // fn get_model(&mut self, path: &Path) -> &Self::Model {
+    //     let path_buf = path.to_path_buf();
+    //     match self.models.entry(path_buf) {
+    //         Entry::Occupied(entry) => entry.into_mut(),
+    //         Entry::Vacant(entry) => {
+    //             let model = load_gltf(path, self.facade.as_ref()).unwrap();
+    //             entry.insert(model)
+    //         }
+    //     }
+    // }
+
+    fn get_model(&self, id: &ModelID) -> Option<&dyn Any> {
+        self.models.get(id).map(|models| models as &dyn Any)
+    }
+}

glium_platform/src/gltf_loader.rs

@@ -0,0 +1,183 @@
+use anyhow::{bail, Context, Result};
+use glium::{backend::Facade, IndexBuffer, VertexBuffer};
+use glium::index::PrimitiveType;
+use std::{fmt::Debug, path::Path};
+use crate::model::{Vertex, Mesh, Material, Model};
+use glium::texture::{RawImage2d, Texture2d, SrgbTexture2d};
+use glium::uniforms::{SamplerWrapFunction, MinifySamplerFilter, MagnifySamplerFilter};
+use gltf::image::Format as GltfFormat;
+use glam::Vec2;
+
+/// Load a glTF 2.0 file from disk and upload all primitives to the GPU.
+///
+/// Returns one [`Model`] per glTF primitive (across all meshes).
+pub fn load_gltf<P>(path: P, facade: &dyn Facade) -> Result<Vec<Model>>
+where
+    P: AsRef<Path> + Debug,
+{
+    // -- parse the asset & bring buffer blobs into memory --
+    let (doc, buffers, images) = gltf::import(path.as_ref()).context("failed to import glTF file")?;
+
+    // Helper to update sampler settings from glTF sampler
+    fn update_sampler(mat: &mut Material, t: &gltf::texture::Texture<'_>) {
+        let sampler_info = t.sampler();
+        mat.sampler.wrap_function.0 = match sampler_info.wrap_s() {
+            gltf::texture::WrappingMode::ClampToEdge => SamplerWrapFunction::Clamp,
+            gltf::texture::WrappingMode::MirroredRepeat => SamplerWrapFunction::Mirror,
+            gltf::texture::WrappingMode::Repeat => SamplerWrapFunction::Repeat,
+        };
+        mat.sampler.wrap_function.1 = match sampler_info.wrap_t() {
+            gltf::texture::WrappingMode::ClampToEdge => SamplerWrapFunction::Clamp,
+            gltf::texture::WrappingMode::MirroredRepeat => SamplerWrapFunction::Mirror,
+            gltf::texture::WrappingMode::Repeat => SamplerWrapFunction::Repeat,
+        };
+        if let Some(f) = sampler_info.mag_filter() {
+            mat.sampler.magnify_filter = match f {
+                gltf::texture::MagFilter::Nearest => MagnifySamplerFilter::Nearest,
+                gltf::texture::MagFilter::Linear => MagnifySamplerFilter::Linear,
+            };
+        }
+        if let Some(f) = sampler_info.min_filter() {
+            mat.sampler.minify_filter = match f {
+                gltf::texture::MinFilter::Nearest => MinifySamplerFilter::Nearest,
+                gltf::texture::MinFilter::Linear => MinifySamplerFilter::Linear,
+                gltf::texture::MinFilter::NearestMipmapNearest => MinifySamplerFilter::NearestMipmapNearest,
+                gltf::texture::MinFilter::NearestMipmapLinear => MinifySamplerFilter::NearestMipmapLinear,
+                gltf::texture::MinFilter::LinearMipmapNearest => MinifySamplerFilter::LinearMipmapNearest,
+                gltf::texture::MinFilter::LinearMipmapLinear => MinifySamplerFilter::LinearMipmapLinear,
+            };
+        }
+    }
+
+    let mut out: Vec<Model> = Vec::new();
+
+    for mesh in doc.meshes() {
+        for primitive in mesh.primitives() {
+            // ---------- MATERIAL ----------
+            let mut mat = Material::default();
+            let material = primitive.material();
+            let pbr = material.pbr_metallic_roughness();
+
+            // Factors --------------------------------------------------
+            mat.base_color_factor = pbr.base_color_factor();
+            mat.metal_factor = pbr.metallic_factor();
+            mat.roughness_factor = pbr.roughness_factor();
+            mat.emissive_factor = material.emissive_factor();
+
+            // Base-color texture (sRGB)
+            if let Some(info) = pbr.base_color_texture() {
+                update_sampler(&mut mat, &info.texture());
+                let view = info.texture().source().index();
+                mat.base_color = Some(glium_srgb_texture(facade, &images[view])?);
+            }
+
+            // Metallic-Roughness (linear)
+            if let Some(info) = pbr.metallic_roughness_texture() {
+                update_sampler(&mut mat, &info.texture());
+                let view = info.texture().source().index();
+                mat.metallic_roughness = Some(glium_linear_texture(facade, &images[view])?);
+            }
+
+            // Normal map (linear)
+            if let Some(info) = material.normal_texture() {
+                update_sampler(&mut mat, &info.texture());
+                let view = info.texture().source().index();
+                mat.normal = Some(glium_linear_texture(facade, &images[view])?);
+            }
+
+            // Occlusion (linear)
+            if let Some(info) = material.occlusion_texture() {
+                update_sampler(&mut mat, &info.texture());
+                let view = info.texture().source().index();
+                mat.occlusion = Some(glium_linear_texture(facade, &images[view])?);
+            }
+
+            // Emissive (sRGB)
+            if let Some(info) = material.emissive_texture() {
+                update_sampler(&mut mat, &info.texture());
+                let view = info.texture().source().index();
+                mat.emissive = Some(glium_srgb_texture(facade, &images[view])?);
+            }
+
+            // KHR_texture_transform (base color only, for now)
+            if let Some(tex) = pbr.base_color_texture() {
+                if let Some(xform) = tex.texture_transform() {
+                    mat.uv_offset = Vec2::new(xform.offset()[0], xform.offset()[1]);
+                    mat.uv_scale = Vec2::new(xform.scale()[0], xform.scale()[1]);
+                }
+            }
+
+            // ---- Vertex/index data ----
+            let reader = primitive.reader(|buf| Some(&buffers[buf.index()].0));
+
+            let positions: Vec<[f32; 3]> = reader.read_positions().context("missing POSITION")?.collect();
+            let normals: Vec<[f32; 3]> = reader.read_normals().context("missing NORMAL")?.collect();
+            let tex_coords: Vec<[f32; 2]> = reader
+                .read_tex_coords(0)
+                .map(|tc| tc.into_f32().collect())
+                .unwrap_or_else(|| vec![[0.0, 0.0]; positions.len()]);
+            let indices: Vec<u32> = reader.read_indices().context("missing indices")?.into_u32().collect();
+
+            // Interleave
+            let vertices: Vec<Vertex> = (0..positions.len())
+                .map(|i| Vertex { position: positions[i], normal: normals[i], tex_coords: tex_coords[i] })
+                .collect();
+
+            let vbuf = VertexBuffer::immutable(facade, &vertices)?;
+            let ibuf = IndexBuffer::immutable(facade, PrimitiveType::TrianglesList, &indices)?;
+
+            out.push(Model { mesh: Mesh { vbuf, ibuf }, material: mat });
+        }
+    }
+
+    if out.is_empty() {
+        bail!("glTF has no mesh primitives");
+    }
+
+    Ok(out)
+}
+
+/// Linear-space texture (RGBA8) from glTF image data.
+fn glium_linear_texture(facade: &dyn Facade, img: &gltf::image::Data) -> Result<Texture2d>
+{
+    let rgba = to_rgba(img);
+    let raw = RawImage2d::from_raw_rgba(rgba, (img.width, img.height));
+    Ok(Texture2d::new(facade, raw)?)
+}
+
+/// sRGB texture from glTF image data.
+fn glium_srgb_texture(facade: &dyn Facade, img: &gltf::image::Data) -> Result<SrgbTexture2d>
+{
+    let rgba = to_rgba(img);
+    let raw = RawImage2d::from_raw_rgba(rgba, (img.width, img.height));
+    Ok(SrgbTexture2d::new(facade, raw)?)
+}
+
+/// Convert various glTF image formats to RGBA8 as expected by glium.
+fn to_rgba(img: &gltf::image::Data) -> Vec<u8> {
+    match img.format {
+        GltfFormat::R8G8B8A8 => img.pixels.clone(),
+        GltfFormat::R8G8B8 => {
+            // Expand RGB to RGBA with alpha=255
+            img.pixels
+                .chunks(3)
+                .flat_map(|rgb| [rgb[0], rgb[1], rgb[2], 255u8])
+                .collect()
+        }
+        GltfFormat::R8G8 => {
+            // Treat RG as luminance+alpha? For simplicity, replicate first channel into RGB, second as alpha.
+            img.pixels
+                .chunks(2)
+                .flat_map(|rg| [rg[0], rg[0], rg[0], rg[1]])
+                .collect()
+        }
+        GltfFormat::R8 => {
+            // Grayscale: replicate into RGB, alpha=255
+            img.pixels
+                .iter()
+                .flat_map(|l| [*l, *l, *l, 255u8])
+                .collect()
+        }
+        _ => img.pixels.clone(),
+    }
+}

glium_platform/src/lib.rs

@@ -0,0 +1,10 @@
+pub mod platform;
+pub mod assets;
+pub mod model;
+pub mod gltf_loader;
+pub mod system;
+mod render;
+
+pub use assets::GliumAssetManager;
+pub use platform::GliumPlatform;
+pub use system::RenderingSystem;

glium_platform/src/model.rs

@@ -1,8 +1,9 @@
-use glium::texture::{RawImage2d, SrgbTexture2d, Texture2d};
+use std::any::{Any, TypeId};
+use glium::{IndexBuffer, VertexBuffer, implement_vertex};
+use glium::texture::{SrgbTexture2d, Texture2d};
 use glium::uniforms::SamplerBehavior;
 use glam::{Vec2};
-use glium::{backend::Facade, implement_vertex, IndexBuffer, VertexBuffer};
-use glium::index::PrimitiveType;
+use std::sync::atomic::{AtomicUsize, Ordering};
 
 #[derive(Copy, Clone)]
 pub struct Vertex {
@@ -52,6 +53,6 @@ impl Default for Material {
 }
 
 pub struct Model {
-    pub mesh:     Mesh,
+    pub mesh: Mesh,
     pub material: Material,
 }

glium_platform/src/platform.rs

@@ -0,0 +1,201 @@
+use std::cell::{RefCell, Cell};
+use std::rc::Rc;
+use std::sync::{Arc, Mutex, RwLock};
+use raidillon_platform::{Platform, PlatformContext, TimeContext, DebugWireframes, DebugWireframesRef};
+use glium::backend::glutin::Display;
+use glium::backend::glutin::SimpleWindowBuilder;
+use glium::glutin::surface::WindowSurface;
+use glium::winit::event_loop::EventLoop;
+use glium::winit::window::Window;
+use glium::Surface;
+use crate::system::{RenderingContext, RenderingSystemManager};
+use winit::event::{DeviceEvent, Event, WindowEvent};
+use raidillon_assets::ModelManagerRef;
+use raidillon_core::engine::EngineTrait;
+use raidillon_core::time;
+use raidillon_core::time::Time;
+use crate::render::{BasicMeshRenderingSystem, DebugWireframeRenderingSystem, EguiRenderer, SkyboxRenderingSystem};
+use crate::GliumAssetManager;
+use glam::Vec3;
+use winit::event::DeviceEvent::MouseMotion;
+use raidillon_core::EguiQueue;
+use raidillon_platform::settings::{Settings, default_config_path};
+
+pub struct GliumPlatform<E: EngineTrait<PlatformCtx = PlatformContext>> {
+    event_loop: EventLoop<()>,
+    window: Arc<Mutex<Window>>,
+    display: Display<WindowSurface>,
+    rendering_system_manager: RenderingSystemManager,
+    asset_manager: ModelManagerRef,
+    engine: E,
+    time: time::Time,
+    egui_queue: Rc<RefCell<EguiQueue>>,
+    settings: Arc<RwLock<Settings>>,
+    debug_wireframes: DebugWireframesRef,
+    should_egui_receive_input_events: Rc<Cell<bool>>,
+}
+
+impl<E: EngineTrait<PlatformCtx = PlatformContext>> Platform<E> for GliumPlatform<E> {
+    fn initialize(mut engine: E, title: String, width: u32, height: u32) -> Self {
+        let event_loop = glium::winit::event_loop::EventLoop::builder()
+            .build()
+            .expect("create event-loop");
+
+        let (window, display) = SimpleWindowBuilder::new()
+            .with_title(title.as_str())
+            .with_inner_size(width, height)
+            .build(&event_loop);
+
+        let asset_manager: ModelManagerRef = Rc::new(RefCell::new(Box::new(GliumAssetManager::new(Box::new(display.clone())))));
+        let mut rendering_system_manager = RenderingSystemManager::new();
+
+        let time_cfg = time::Config::default();
+        let time = time::Time::new(time_cfg);
+
+        let window = Arc::new(Mutex::new(window));
+
+        // Install rendering systems in order
+        rendering_system_manager.add::<SkyboxRenderingSystem>(&display, window.clone(), &event_loop);
+        rendering_system_manager.add::<BasicMeshRenderingSystem>(&display, window.clone(), &event_loop);
+        rendering_system_manager.add::<DebugWireframeRenderingSystem>(&display, window.clone(), &event_loop);
+        rendering_system_manager.add::<EguiRenderer>(&display, window.clone(), &event_loop);
+
+        let egui_queue = Rc::new(RefCell::new(EguiQueue::new()));
+
+        let settings = Arc::new(
+            RwLock::new(
+                Settings::load_or_default(default_config_path()).unwrap()
+            )
+        );
+        let debug_wireframes = Rc::new(RefCell::new(DebugWireframes::new()));
+        let should_egui_receive_input_events = Rc::new(Cell::new(false));
+
+        Self {
+            event_loop,
+            window,
+            display,
+            rendering_system_manager,
+            asset_manager,
+            engine,
+            time,
+            egui_queue,
+            settings,
+            debug_wireframes,
+            should_egui_receive_input_events,
+        }
+    }
+
+    fn run(mut self) {
+        let (w, h): (u32, u32) = match self.window.lock() {
+            Ok(window) => window.inner_size().into(),
+            Err(_) => (0, 0), // fallback values
+        };
+        let ctx = PlatformContext {
+            current_event: Event::AboutToWait,
+            asset_manager: self.asset_manager.clone(),
+            frame_width: w as f32,
+            frame_height: h as f32,
+            time_ctx: self.construct_time_ctx(),
+            window: self.window.clone(),
+            egui_queue: self.egui_queue.clone(),
+            settings: self.settings.clone(),
+            debug_wireframes: self.debug_wireframes.clone(),
+            should_egui_receive_input_events: self.should_egui_receive_input_events.clone(),
+        };
+        self.engine.initialize(ctx.clone());
+        self.settings.read().unwrap().display_settings.apply(&*self.window.lock().unwrap());
+
+        let _ = &self.event_loop.run(move |event, el| {
+            let settings_handle = self.settings.read().unwrap();
+            if settings_handle.display_settings.dirty {
+                settings_handle.display_settings.apply(&*self.window.lock().unwrap());
+            }
+            drop(settings_handle);
+
+            self.rendering_system_manager
+                .systems
+                .values_mut()
+                .for_each(|system| system.handle_event(self.window.clone(), event.clone()));
+
+            let mut ctx2 = ctx.clone();
+            ctx2.current_event = event.clone();
+            self.engine.handle_event(ctx2);
+
+            match event {
+                Event::WindowEvent { event, .. } => match event {
+                    WindowEvent::Resized(size) => {
+                        if size.width > 0 && size.height > 0 {
+                            self.display.resize((size.width, size.height));
+                        }
+                    },
+                    WindowEvent::CloseRequested => {
+                        // TODO: Run uninitialize on renderer and engine
+                        self.settings.read().unwrap().save_to_file(default_config_path());
+                        el.exit();
+                    },
+                    WindowEvent::RedrawRequested => {
+                        let mut target = self.display.draw();
+                        target.clear_color_and_depth((0.1, 0.1, 0.15, 1.0), 1.0);
+                        let scene = self.engine.current_scene();
+                        let mut context = RenderingContext {
+                            scene,
+                            target: &mut target,
+                            display: &self.display,
+                            asset_manager: self.asset_manager.clone(),
+                            window: self.window.clone(),
+                            egui_queue: self.egui_queue.clone(),
+                            debug_wireframes: self.debug_wireframes.clone(),
+                            env_light_dir: Vec3::new(0.0, -1.0, 0.0),
+                            should_egui_receive_input_events: self.should_egui_receive_input_events.clone(),
+                        };
+
+                        self.rendering_system_manager
+                            .systems
+                            .values_mut()
+                            .for_each(|system| system.render(&mut context));
+
+                        // clear debug wireframes after rendering
+                        self.debug_wireframes.borrow_mut().clear();
+
+                        target.finish().unwrap();
+                    }
+                    _ => {},
+                },
+                Event::AboutToWait => {
+                    let plan = self.time.begin_frame_blocking();
+
+                    let mut ctx2 = ctx.clone();
+                    ctx2.time_ctx = TimeContext {
+                        frame_dt: self.time.frame_dt_seconds(),
+                        fixed_dt: self.time.fixed_dt_seconds(),
+                        alpha: self.time.alpha(),
+                    };
+                    ctx2.current_event = Event::AboutToWait;
+
+                    for _ in 0..plan.updates {
+                        self.engine.fixed_update(ctx2.clone());
+                    }
+
+                    self.engine.frame_update(ctx2.clone());
+
+                    self.rendering_system_manager
+                        .systems
+                        .values_mut()
+                        .for_each(|system| system.prepare_frame(self.window.clone()));
+                    self.window.lock().unwrap().request_redraw();
+                }
+                _ => {},
+            }
+        });
+    }
+}
+
+impl<E: EngineTrait<PlatformCtx = PlatformContext>> GliumPlatform<E> {
+    fn construct_time_ctx(&self) -> TimeContext {
+        TimeContext {
+            frame_dt: self.time.frame_dt_seconds(),
+            fixed_dt: self.time.fixed_dt_seconds(),
+            alpha: self.time.alpha(),
+        }
+    }
+}

glium_platform/src/render/basic.rs

@@ -0,0 +1,115 @@
+use std::any::Any;
+use std::sync::{Arc, Mutex};
+use glium::{uniform, Display, Program, Surface};
+use glium::glutin::surface::WindowSurface;
+use glium::texture::{RawImage2d, SrgbTexture2d};
+use crate::{GliumAssetManager, RenderingSystem};
+use crate::system::RenderingContext;
+use raidillon_assets::include_shader;
+pub use raidillon_platform::Camera;
+use glam::Vec3;
+use glium::uniforms::{MagnifySamplerFilter, MinifySamplerFilter, SamplerWrapFunction};
+use winit::event::Event;
+use winit::event_loop::EventLoop;
+use raidillon_ecs::{Transform, ModelID};
+use raidillon_ecs::components::ModelHandle;
+use crate::model::Model;
+
+/// A basic renderer pipeline step.
+pub struct BasicMeshRenderingSystem {
+    program: Program,
+    white_tex: SrgbTexture2d,
+    params: glium::DrawParameters<'static>,
+}
+
+impl RenderingSystem for BasicMeshRenderingSystem {
+    fn initialize(display: &Display<WindowSurface>, _window: Arc<Mutex<glium::winit::window::Window>>, event_loop: &EventLoop<()>) -> Self {
+        const VERT_SRC: &str = include_shader!("gl_textured.vert");
+        const FRAG_SRC: &str = include_shader!("gl_textured.frag");
+
+        let program = Program::from_source(display, VERT_SRC, FRAG_SRC, None).unwrap();
+
+        let white_tex = {
+            let data = vec![255u8, 255u8, 255u8, 255u8];
+            let raw  = RawImage2d::from_raw_rgba(data, (1, 1));
+            SrgbTexture2d::new(display, raw).unwrap()
+        };
+
+        let params = glium::DrawParameters {
+            depth: glium::Depth {
+                test: glium::draw_parameters::DepthTest::IfLess,
+                write: true,
+                .. Default::default()
+            },
+            .. Default::default()
+        };
+
+        Self {
+            program, white_tex, params
+        }
+    }
+
+    fn render(&mut self, ctx: &mut RenderingContext) {
+        let cam = match ctx.scene.world.query::<&Camera>().iter().next() {
+            Some((_, cam)) => *cam,
+            None => {
+                eprintln!("[renderer] No camera component found. Skipping frame");
+                return;
+            }
+        };
+
+        // Use HDR-derived environment light direction if provided, otherwise default to downward
+        let light_dir_world: Vec3 = if ctx.env_light_dir.length_squared() > 0.0 { ctx.env_light_dir.normalize() } else { Vec3::new(0.0, -1.0, 0.0) };
+
+        // Transform light direction to view space (normals/positions are in view space)
+        let view_mat3 = glam::Mat3::from_mat4(cam.view());
+        let light_dir_view = (view_mat3 * light_dir_world).normalize();
+
+        let asset_manager = ctx.asset_manager.borrow();
+
+        for (_, (tr, mh)) in ctx.scene.world.query::<(&Transform, &ModelHandle)>().iter() {
+            let model = match asset_manager.get_model(&mh.0) {
+                Some(model) => model,
+                _ => continue,
+            };
+
+            let models = match model.downcast_ref::<Vec<Model>>() {
+                Some(models) => models,
+                None => continue,
+            };
+
+            for model in models {
+                let mesh = &model.mesh;
+                let mat = &model.material;
+
+                let tex_ref: &SrgbTexture2d = mat.base_color.as_ref().unwrap_or(&self.white_tex);
+
+                let mut sampler = tex_ref.sampled();
+                sampler = sampler.wrap_function(SamplerWrapFunction::Repeat);
+                sampler = sampler.minify_filter(MinifySamplerFilter::Linear);
+                sampler = sampler.magnify_filter(MagnifySamplerFilter::Linear);
+
+                let c = mat.base_color_factor;
+
+                let uniforms = uniform! {
+                    model:      tr.matrix().to_cols_array_2d(),
+                    view:       cam.view().to_cols_array_2d(),
+                    projection: cam.projection().to_cols_array_2d(),
+                    u_light:    [light_dir_view.x, light_dir_view.y, light_dir_view.z],
+                    tex:        sampler,
+                    color:      [c[0], c[1], c[2]],
+                    uv_offset:  [mat.uv_offset.x, mat.uv_offset.y],
+                    uv_scale:   [mat.uv_scale.x,  mat.uv_scale.y],
+                };
+
+                ctx.target.draw(
+                    &mesh.vbuf,
+                    &mesh.ibuf,
+                    &self.program,
+                    &uniforms,
+                    &self.params,
+                ).unwrap();
+            }
+        }
+    }
+}

glium_platform/src/render/debug_wireframe.rs

@@ -0,0 +1,80 @@
+use std::sync::{Arc, Mutex};
+use glium::{Display, Program, Surface, VertexBuffer, implement_vertex};
+use glium::glutin::surface::WindowSurface;
+use glium::index::PrimitiveType;
+use glium::uniform;
+use winit::event_loop::EventLoop;
+use raidillon_assets::include_shader;
+use crate::system::RenderingContext;
+use crate::RenderingSystem;
+pub use raidillon_platform::Camera;
+
+#[derive(Copy, Clone)]
+struct DebugVertex {
+    position: [f32; 3],
+    color: [f32; 4],
+}
+
+implement_vertex!(DebugVertex, position, color);
+
+/// renders debug wireframes from the shared buffer
+pub struct DebugWireframeRenderingSystem {
+    program: Program,
+    params: glium::DrawParameters<'static>,
+}
+
+impl RenderingSystem for DebugWireframeRenderingSystem {
+    fn initialize(display: &Display<WindowSurface>, _window: Arc<Mutex<glium::winit::window::Window>>, _event_loop: &EventLoop<()>) -> Self {
+        const VERT_SRC: &str = include_shader!("debug_wireframe.vert");
+        const FRAG_SRC: &str = include_shader!("debug_wireframe.frag");
+
+        let program = Program::from_source(display, VERT_SRC, FRAG_SRC, None).unwrap();
+
+        let params = glium::DrawParameters {
+            depth: glium::Depth {
+                test: glium::draw_parameters::DepthTest::IfLess,
+                write: false,
+                ..Default::default()
+            },
+            line_width: Some(1.0),
+            ..Default::default()
+        };
+
+        Self { program, params }
+    }
+
+    fn render(&mut self, ctx: &mut RenderingContext) {
+        let debug_wireframes = ctx.debug_wireframes.borrow();
+
+        if !debug_wireframes.enabled || debug_wireframes.vertices.is_empty() {
+            return;
+        }
+
+        let cam = match ctx.scene.world.query::<&Camera>().iter().next() {
+            Some((_, cam)) => *cam,
+            None => return,
+        };
+
+        let vertices: Vec<DebugVertex> = debug_wireframes.vertices.iter()
+            .map(|v| DebugVertex { position: v.position, color: v.color })
+            .collect();
+
+        let vbuf = match VertexBuffer::new(ctx.display, &vertices) {
+            Ok(vb) => vb,
+            Err(_) => return,
+        };
+
+        let uniforms = uniform! {
+            view: cam.view().to_cols_array_2d(),
+            projection: cam.projection().to_cols_array_2d(),
+        };
+
+        ctx.target.draw(
+            &vbuf,
+            glium::index::NoIndices(PrimitiveType::LinesList),
+            &self.program,
+            &uniforms,
+            &self.params,
+        ).ok();
+    }
+}

glium_platform/src/render/egui.rs

@@ -0,0 +1,74 @@
+use std::sync::{Arc, Mutex};
+use egui::ViewportId;
+use glium::{Display, Frame};
+use glium::glutin::surface::WindowSurface;
+use winit::window::Window;
+use crate::RenderingSystem;
+use crate::system::RenderingContext;
+use egui_glium::EguiGlium;
+use winit::event::{Event, WindowEvent};
+use winit::event_loop::EventLoop;
+use std::cell::Cell;
+use std::rc::Rc;
+
+pub struct EguiRenderer {
+    egui_glium: EguiGlium,
+    should_egui_receive_input_events: Option<Rc<Cell<bool>>>,
+}
+
+impl RenderingSystem for EguiRenderer {
+    fn initialize(display: &Display<WindowSurface>, window: Arc<Mutex<Window>>, event_loop: &EventLoop<()>) -> Self
+    where
+        Self: Sized,
+    {
+        let window = window.lock().unwrap();
+        let egui_glium = EguiGlium::new(ViewportId::ROOT, &display, &window, &event_loop);
+
+        Self { egui_glium: egui_glium, should_egui_receive_input_events: None }
+    }
+
+    fn render(&mut self, ctx: &mut RenderingContext) {
+        if self.should_egui_receive_input_events.is_none() {
+            self.should_egui_receive_input_events = Some(ctx.should_egui_receive_input_events.clone());
+        }
+
+        let window = ctx.window.lock().unwrap();
+
+        self.egui_glium.run(&window, |egui_ctx| {
+            ctx.egui_queue.borrow_mut().run(egui_ctx);
+        });
+
+        self.egui_glium.paint(ctx.display, ctx.target);
+    }
+
+    fn handle_event(&mut self, window: Arc<Mutex<Window>>, event: Event<()>) {
+        let window = window.lock().unwrap();
+        match event {
+            Event::WindowEvent { event, .. } => {
+                let should_egui_receive_input_events = match self.should_egui_receive_input_events.as_ref() {
+                    Some(v) => v.get(),
+                    None => true,
+                };
+
+                let should_send_event = if should_egui_receive_input_events {
+                    true
+                } else {
+                    !matches!(event,
+                        WindowEvent::KeyboardInput { .. } |
+                        WindowEvent::ModifiersChanged(_) |
+                        WindowEvent::CursorMoved { .. } |
+                        WindowEvent::MouseInput { .. } |
+                        WindowEvent::MouseWheel { .. } |
+                        WindowEvent::Touch(_) |
+                        WindowEvent::Ime(_)
+                    )
+                };
+
+                if should_send_event {
+                    let _ = self.egui_glium.on_event(&window, &event);
+                }
+            }
+            _ => {},
+        }
+    }
+}

glium_platform/src/render/mod.rs

@@ -0,0 +1,9 @@
+mod basic;
+mod skybox;
+mod egui;
+mod debug_wireframe;
+
+pub use basic::BasicMeshRenderingSystem;
+pub use skybox::SkyboxRenderingSystem;
+pub use egui::EguiRenderer;
+pub use debug_wireframe::DebugWireframeRenderingSystem;

glium_platform/src/render/skybox.rs

@@ -0,0 +1,157 @@
+use std::path::PathBuf;
+use std::rc::Rc;
+use std::cell::RefCell;
+use std::sync::{Arc, Mutex};
+use glium::{Display, Program, Surface, VertexBuffer, IndexBuffer, implement_vertex};
+use glium::glutin::surface::WindowSurface;
+use glium::index::PrimitiveType;
+use glium::texture::{RawImage2d, SrgbTexture2d, Texture2d};
+use glium::uniform;
+use glium::uniforms::{MagnifySamplerFilter, MinifySamplerFilter, SamplerWrapFunction};
+use glam::{Mat4, Vec2, Vec3};
+use winit::event_loop::EventLoop;
+use raidillon_assets::include_shader;
+use crate::system::RenderingContext;
+use crate::RenderingSystem;
+
+#[derive(Copy, Clone)]
+struct SkyboxVertex { position: [f32; 3] }
+implement_vertex!(SkyboxVertex, position);
+
+pub struct SkyboxRenderingSystem {
+	program: Program,
+	quad_vb: VertexBuffer<SkyboxVertex>,
+	quad_ib: IndexBuffer<u16>,
+	/// Equirectangular HDR image, tonemapped to sRGB for skybox view
+	equirect_srgb: SrgbTexture2d,
+	/// Dominant light direction estimated from HDRI
+	light_dir: Vec3,
+}
+
+impl SkyboxRenderingSystem {
+	fn build_cube(display: &Display<WindowSurface>) -> (VertexBuffer<SkyboxVertex>, IndexBuffer<u16>) {
+		// Unit cube centered at origin
+		let p = &[
+			[-1.0, -1.0, -1.0], [ 1.0, -1.0, -1.0], [ 1.0,  1.0, -1.0], [-1.0,  1.0, -1.0], // back
+			[-1.0, -1.0,  1.0], [ 1.0, -1.0,  1.0], [ 1.0,  1.0,  1.0], [-1.0,  1.0,  1.0], // front
+		];
+		let verts = vec![
+			SkyboxVertex { position: p[0] }, SkyboxVertex { position: p[1] }, SkyboxVertex { position: p[2] }, SkyboxVertex { position: p[3] }, // back
+			SkyboxVertex { position: p[4] }, SkyboxVertex { position: p[5] }, SkyboxVertex { position: p[6] }, SkyboxVertex { position: p[7] }, // front
+		];
+		let idx: [u16; 36] = [
+			// back face
+			0,1,2,  2,3,0,
+			// front face
+			4,6,5,  6,4,7,
+			// left face
+			0,3,7,  7,4,0,
+			// right face
+			1,5,6,  6,2,1,
+			// bottom face
+			0,4,5,  5,1,0,
+			// top face
+			3,2,6,  6,7,3,
+		];
+		(
+			VertexBuffer::new(display, &verts).unwrap(),
+			IndexBuffer::new(display, PrimitiveType::TrianglesList, &idx).unwrap(),
+		)
+	}
+
+	fn load_hdr_equirect_and_analyze(display: &Display<WindowSurface>, path: &std::path::Path) -> (SrgbTexture2d, Vec3) {
+		// Use image crate to decode EXR as f32 RGB
+		let dyn_img = image::ImageReader::open(path).expect("open exr").with_guessed_format().expect("guess format").decode().expect("decode exr");
+		let hdr = dyn_img.to_rgb32f();
+		let (width, height) = hdr.dimensions();
+		let width = width as usize; let height = height as usize;
+		let mut dir_accum = Vec3::ZERO;
+		let mut weight_sum = 0.0f32;
+		for y in 0..height {
+			let v = (y as f32 + 0.5) / height as f32;
+			let theta = (v - 0.5) * std::f32::consts::PI;
+			let lat_weight = theta.cos().max(0.0);
+			for x in 0..width {
+				let u = (x as f32 + 0.5) / width as f32;
+				let phi = (u - 0.5) * 2.0 * std::f32::consts::PI;
+				let px = hdr.get_pixel(x as u32, y as u32).0;
+				let rgb = Vec3::new(px[0], px[1], px[2]);
+				let lum = 0.2126*rgb.x + 0.7152*rgb.y + 0.0722*rgb.z;
+				if lum > 0.0 {
+					let dir = Vec3::new(phi.cos()*theta.cos(), theta.sin(), phi.sin()*theta.cos());
+					let w = lum * lat_weight;
+					dir_accum += dir * w;
+					weight_sum += w;
+				}
+			}
+		}
+		let mut light_dir = if weight_sum > 0.0 { dir_accum / weight_sum } else { Vec3::new(0.0, -1.0, 0.0) };
+		if light_dir.length_squared() < 1e-6 { light_dir = Vec3::new(0.0,-1.0,0.0); }
+		light_dir = light_dir.normalize();
+
+		// Tonemap to sRGB
+		let mut srgb_bytes = Vec::with_capacity(width*height*4);
+		for y in 0..height {
+			for x in 0..width {
+				let px = hdr.get_pixel(x as u32, y as u32).0;
+				let mapped = Vec3::new(px[0], px[1], px[2]) / (Vec3::new(px[0], px[1], px[2]) + Vec3::ONE);
+				let srgb = mapped.powf(1.0/2.2);
+				srgb_bytes.extend_from_slice(&[
+					(srgb.x.clamp(0.0,1.0)*255.0) as u8,
+					(srgb.y.clamp(0.0,1.0)*255.0) as u8,
+					(srgb.z.clamp(0.0,1.0)*255.0) as u8,
+					255u8,
+				]);
+			}
+		}
+		let raw = RawImage2d::from_raw_rgba(srgb_bytes, (width as u32, height as u32));
+		let tex = SrgbTexture2d::new(display, raw).unwrap();
+		(tex, light_dir)
+	}
+}
+
+impl RenderingSystem for SkyboxRenderingSystem {
+	fn initialize(display: &Display<WindowSurface>, _window: Arc<Mutex<glium::winit::window::Window>>, event_loop: &EventLoop<()>) -> Self {
+		const VERT_SRC: &str = include_shader!("skybox.vert");
+		const FRAG_SRC: &str = include_shader!("skybox.frag");
+		let program = Program::from_source(display, VERT_SRC, FRAG_SRC, None).unwrap();
+		let (quad_vb, quad_ib) = Self::build_cube(display);
+
+		// Load EXR from assets/exr
+		let manifest_dir = env!("CARGO_MANIFEST_DIR");
+		let path = std::path::Path::new(manifest_dir).join("../assets/exr/citrus_orchard_road_puresky_4k.exr");
+		let (equirect_srgb, light_dir) = Self::load_hdr_equirect_and_analyze(display, &path);
+		Self { program, quad_vb, quad_ib, equirect_srgb, light_dir }
+	}
+
+	fn render(&mut self, ctx: &mut RenderingContext) {
+		// Provide view and projection without translation for skybox
+		let cam = match ctx.scene.world.query::<&raidillon_platform::Camera>().iter().next() {
+			Some((_, cam)) => *cam,
+			None => return,
+		};
+		let mut view = cam.view();
+		// remove translation from view matrix (only orientation)
+		view.col_mut(3).x = 0.0; view.col_mut(3).y = 0.0; view.col_mut(3).z = 0.0;
+		let mut sampler = self.equirect_srgb.sampled();
+		sampler = sampler.wrap_function(SamplerWrapFunction::Repeat);
+		sampler = sampler.minify_filter(MinifySamplerFilter::Linear);
+		sampler = sampler.magnify_filter(MagnifySamplerFilter::Linear);
+
+		let uniforms = uniform! {
+			view:       view.to_cols_array_2d(),
+			projection: cam.projection().to_cols_array_2d(),
+			equirect:   sampler,
+		};
+		let params = glium::DrawParameters { depth: glium::Depth { test: glium::draw_parameters::DepthTest::IfLessOrEqual, write: false, ..Default::default() }, ..Default::default() };
+		ctx.target.draw(&self.quad_vb, &self.quad_ib, &self.program, &uniforms, &params).ok();
+
+		// Share light direction with following passes
+		ctx.env_light_dir = self.light_dir;
+	}
+}
+
+// Provide a getter for light direction for other systems
+impl SkyboxRenderingSystem {
+	pub fn light_direction(&self) -> Vec3 { self.light_dir }
+}

glium_platform/src/system.rs

@@ -0,0 +1,68 @@
+use std::any::TypeId;
+use std::cell::RefCell;
+use std::rc::Rc;
+use std::sync::{Arc, Mutex};
+use indexmap::IndexMap;
+use glium::{Display, Frame};
+use glium::glutin::surface::WindowSurface;
+use raidillon_assets::ModelManagerRef;
+use raidillon_core::{define_typemap, EguiQueue};
+use raidillon_core::scene::Scene;
+use raidillon_platform::DebugWireframesRef;
+use glam::Vec3;
+use winit::event_loop::EventLoop;
+use std::cell::Cell;
+
+pub struct RenderingContext<'a> {
+    pub scene: &'a Scene,
+    pub target: &'a mut Frame,
+    pub window: Arc<Mutex<glium::winit::window::Window>>,
+    pub display: &'a Display<WindowSurface>,
+    pub asset_manager: ModelManagerRef,
+    pub egui_queue: Rc<RefCell<EguiQueue>>,
+    pub debug_wireframes: DebugWireframesRef,
+    pub env_light_dir: Vec3,
+    pub should_egui_receive_input_events: Rc<Cell<bool>>
+}
+
+/// The internal "rendering system" trait of glium_platform.
+/// This is unrelated to the main System trait in core.
+pub trait RenderingSystem {
+    fn handle_event(
+        &mut self,
+        _window: Arc<Mutex<glium::winit::window::Window>>,
+        _event: winit::event::Event<()>,
+    ) {
+    }
+    fn prepare_frame(&mut self, _window: Arc<Mutex<glium::winit::window::Window>>) {}
+    fn render(&mut self, ctx: &mut RenderingContext);
+    fn initialize(display: &Display<WindowSurface>, window: Arc<Mutex<glium::winit::window::Window>>, event_loop: &EventLoop<()>) -> Self
+    where
+        Self: Sized;
+}
+
+// define_typemap!(RenderingSystemManager, RenderingSystem);
+
+pub struct RenderingSystemManager {
+    pub systems: IndexMap<TypeId, Box<dyn RenderingSystem>>,
+}
+
+impl RenderingSystemManager {
+    pub fn new() -> Self {
+        Self {
+            systems: IndexMap::default(),
+        }
+    }
+
+    pub fn add<R>(&mut self, display: &Display<WindowSurface>, window: Arc<Mutex<glium::winit::window::Window>>, event_loop: &EventLoop<()>)
+    where
+        R: RenderingSystem + 'static,
+    {
+        let system = R::initialize(display, window, event_loop);
+        self.systems.insert(TypeId::of::<R>(), Box::new(system));
+    }
+
+    pub fn remove<R: 'static>(&mut self) {
+        self.systems.shift_remove(&TypeId::of::<R>());
+    }
+}

justfile

@@ -1,8 +0,0 @@
-default:
-    @just --list
-
-run *ARGS:
-    cargo run {{ARGS}}
-
-watch:
-	bacon

physics/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "raidillon_physics"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rapier3d = "0.30.1"
+raidillon_ecs = { path = "../ecs" }
+glam = "0.30.8"

physics/src/lib.rs

@@ -0,0 +1,3 @@
+mod physics;
+
+pub use crate::physics::Physics;

physics/src/physics.rs

@@ -0,0 +1,82 @@
+use glam::{Quat, Vec3};
+use rapier3d::na::{Quaternion, UnitQuaternion};
+use rapier3d::prelude::*;
+use raidillon_ecs::Transform;
+
+/// Tiny wrapper around rapier3d.
+pub struct Physics {
+    pub rigid_body_set: RigidBodySet,
+    pub collider_set: ColliderSet,
+    physics_pipeline: PhysicsPipeline,
+    island_manager: IslandManager,
+    pub broad_phase: DefaultBroadPhase,
+    pub narrow_phase: NarrowPhase,
+    impulse_joint_set: ImpulseJointSet,
+    multibody_joint_set: MultibodyJointSet,
+    ccd_solver: CCDSolver,
+    gravity: Vector<f32>,
+    integration_parameters: IntegrationParameters,
+}
+
+impl Default for Physics {
+    fn default() -> Self {
+        Self {
+            gravity: vector![0.0, -9.81, 0.0],
+            rigid_body_set: Default::default(),
+            collider_set: Default::default(),
+            physics_pipeline: Default::default(),
+            island_manager: Default::default(),
+            broad_phase: Default::default(),
+            narrow_phase: Default::default(),
+            impulse_joint_set: Default::default(),
+            multibody_joint_set: Default::default(),
+            ccd_solver: Default::default(),
+            integration_parameters: Default::default(),
+        }
+    }
+}
+
+impl Physics {
+    pub fn step(&mut self, dt: f32) {
+        self.integration_parameters.dt = dt;
+        self.physics_pipeline.step(
+            &self.gravity,
+            &self.integration_parameters,
+            &mut self.island_manager,
+            &mut self.broad_phase,
+            &mut self.narrow_phase,
+            &mut self.rigid_body_set,
+            &mut self.collider_set,
+            &mut self.impulse_joint_set,
+            &mut self.multibody_joint_set,
+            &mut self.ccd_solver,
+            &(),
+            &(),
+        );
+    }
+
+    pub fn add_rigid_body(&mut self, kind: RigidBodyType, transform: Transform, collider: Collider) -> RigidBodyHandle {
+        let rb = RigidBodyBuilder::new(kind)
+            .translation(vector![transform.translation.x, transform.translation.y, transform.translation.z])
+            .build();
+        let rb_handle = self.rigid_body_set.insert(rb);
+        self.collider_set.insert_with_parent(collider, rb_handle, &mut self.rigid_body_set);
+        rb_handle
+    }
+
+    pub fn get_rigid_body(&self, handle: RigidBodyHandle) -> Option<&RigidBody> {
+        self.rigid_body_set.get(handle)
+    }
+
+    pub fn get_rigid_body_mut(&mut self, handle: RigidBodyHandle) -> Option<&mut RigidBody> {
+        self.rigid_body_set.get_mut(handle)
+    }
+
+    pub fn rapier_translation_to_glam(v: &Vector<f32>) -> Vec3 {
+        Vec3::new(v.x, v.y, v.z)
+    }
+
+    pub fn rapier_rotation_to_glam(r: &UnitQuaternion<f32>) -> Quat {
+        Quat::from_xyzw(r.i, r.j, r.k, r.w)
+    }
+}

platform/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "raidillon_platform"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+winit = "0.30.12"
+raidillon_core = { path = "../core" }
+raidillon_assets = { path = "../asset" }
+glam = "0.30.5"
+serde = { version = "1.0.228", features = ["derive"] }
+toml = "0.9.8"

platform/src/context.rs

@@ -0,0 +1,86 @@
+use std::cell::Cell;
+use std::{cell::RefCell, rc::Rc};
+use std::sync::{Arc, Mutex, RwLock};
+use winit::event::Event;
+use raidillon_assets::ModelManagerRef;
+use raidillon_core::EguiQueue;
+use crate::settings::Settings;
+
+/// a single debug wireframe vertex with position and color
+#[derive(Clone, Copy)]
+pub struct DebugWireframeVertex {
+    pub position: [f32; 3],
+    pub color: [f32; 4],
+}
+
+/// shared buffer for debug wireframe rendering
+#[derive(Clone, Default)]
+pub struct DebugWireframes {
+    pub vertices: Vec<DebugWireframeVertex>,
+    pub enabled: bool,
+}
+
+impl DebugWireframes {
+    pub fn new() -> Self {
+        Self { vertices: Vec::new(), enabled: true }
+    }
+
+    pub fn clear(&mut self) {
+        self.vertices.clear();
+    }
+
+    /// add a single line segment
+    pub fn add_line(&mut self, start: [f32; 3], end: [f32; 3], color: [f32; 4]) {
+        self.vertices.push(DebugWireframeVertex { position: start, color });
+        self.vertices.push(DebugWireframeVertex { position: end, color });
+    }
+
+    /// add a wireframe box from min/max corners
+    pub fn add_box(&mut self, min: [f32; 3], max: [f32; 3], color: [f32; 4]) {
+        let [x0, y0, z0] = min;
+        let [x1, y1, z1] = max;
+
+        // bottom face edges
+        self.add_line([x0, y0, z0], [x1, y0, z0], color);
+        self.add_line([x1, y0, z0], [x1, y0, z1], color);
+        self.add_line([x1, y0, z1], [x0, y0, z1], color);
+        self.add_line([x0, y0, z1], [x0, y0, z0], color);
+
+        // top face edges
+        self.add_line([x0, y1, z0], [x1, y1, z0], color);
+        self.add_line([x1, y1, z0], [x1, y1, z1], color);
+        self.add_line([x1, y1, z1], [x0, y1, z1], color);
+        self.add_line([x0, y1, z1], [x0, y1, z0], color);
+
+        // vertical edges
+        self.add_line([x0, y0, z0], [x0, y1, z0], color);
+        self.add_line([x1, y0, z0], [x1, y1, z0], color);
+        self.add_line([x1, y0, z1], [x1, y1, z1], color);
+        self.add_line([x0, y0, z1], [x0, y1, z1], color);
+    }
+}
+
+pub type DebugWireframesRef = Rc<RefCell<DebugWireframes>>;
+
+#[derive(Clone)]
+pub struct PlatformContext {
+    pub current_event: Event<()>,
+    pub asset_manager: ModelManagerRef,
+    pub frame_width: f32,
+    pub frame_height: f32,
+    pub time_ctx: TimeContext,
+    pub window: Arc<Mutex<winit::window::Window>>,
+    pub egui_queue: Rc<RefCell<EguiQueue>>,
+    pub settings: Arc<RwLock<Settings>>,
+    /// shared debug wireframe buffer
+    pub debug_wireframes: DebugWireframesRef,
+    /// sets whether or not egui will receive input events
+    pub should_egui_receive_input_events: Rc<Cell<bool>>,
+}
+
+#[derive(Clone)]
+pub struct TimeContext {
+    pub frame_dt: f32,
+    pub fixed_dt: f32,
+    pub alpha: f32,
+}

platform/src/event.rs

@@ -0,0 +1,11 @@
+pub enum PlatformEvent {
+    /// Emmited when the window should
+    RedrawRequested,
+
+    /// The platform has requested to close the app.
+    CloseRequested,
+
+    /// Platform event loop is about to block and wait for new
+    /// new events.
+    AboutToWait
+}

platform/src/lib.rs

@@ -0,0 +1,9 @@
+pub mod platform;
+mod camera;
+mod event;
+pub mod context;
+pub mod settings;
+
+pub use platform::Platform;
+pub use camera::Camera;
+pub use context::{PlatformContext, TimeContext, DebugWireframes, DebugWireframesRef, DebugWireframeVertex};

platform/src/platform.rs

@@ -0,0 +1,8 @@
+use crate::PlatformContext;
+use raidillon_core::engine::EngineTrait;
+
+pub trait Platform<E: EngineTrait<PlatformCtx = PlatformContext>> {
+    /// Initialize platform.
+    fn initialize(engine: E, title: String, width: u32, height: u32) -> Self;
+    fn run(self);
+}

platform/src/settings.rs

@@ -0,0 +1,166 @@
+use winit::monitor::{MonitorHandle, VideoModeHandle};
+use winit::window::{Fullscreen, Window};
+use serde::{Serialize, Deserialize};
+use std::error::Error;
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+
+pub fn default_config_path() -> PathBuf {
+    let exe_path = std::env::current_exe().unwrap();
+    let exe_dir = exe_path
+        .parent()
+        .ok_or_else(|| std::io::Error::new(std::io::ErrorKind::Other, "executable has no parent")).unwrap();
+
+    exe_dir.join("settings.toml")
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum WindowMode {
+    BorderlessFullscreen,
+    ExclusiveFullscreen,
+    #[default]
+    Windowed,
+}
+
+#[derive(Debug, Default, Serialize, Deserialize)]
+pub struct Settings {
+    pub display_settings: DisplaySettings,
+}
+
+impl Settings {
+    pub fn load_from_file(path: impl AsRef<Path>) -> Result<Self, Box<dyn Error>> {
+        let path = path.as_ref();
+        let text = fs::read_to_string(path)?;
+        let settings: Settings = toml::from_str(&text)?;
+        Ok(settings)
+    }
+
+    pub fn save_to_file(&self, path: impl AsRef<Path>) -> Result<(), Box<dyn Error>> {
+        let path = path.as_ref();
+        if let Some(parent) = path.parent() {
+            fs::create_dir_all(parent)?;
+        }
+        let toml_str = toml::to_string_pretty(self)?;
+        fs::write(path, toml_str)?;
+        Ok(())
+    }
+
+    pub fn load_or_default(path: impl AsRef<Path>) -> Result<Self, Box<dyn Error>> {
+        let path = path.as_ref();
+
+        match fs::read_to_string(path) {
+            Ok(text) => {
+                let settings: Settings = toml::from_str(&text)?;
+                Ok(settings)
+            }
+            Err(err) if err.kind() == io::ErrorKind::NotFound => {
+                let settings = Settings::default();
+                if let Some(parent) = path.parent() {
+                    fs::create_dir_all(parent)?;
+                }
+                let toml_str = toml::to_string_pretty(&settings)?;
+                fs::write(path, toml_str)?;
+                Ok(settings)
+            }
+            Err(err) => Err(Box::new(err)),
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(default)]
+pub struct DisplaySettings {
+    pub fullscreen_mode: WindowMode,
+    #[serde(skip)]
+    pub dirty: bool,
+}
+
+impl Default for DisplaySettings {
+    fn default() -> Self {
+        Self {
+            fullscreen_mode: WindowMode::Windowed,
+            dirty: false,
+        }
+    }
+}
+
+impl DisplaySettings {
+    pub fn apply(&self, window: &Window) {
+        // apply fullscreen mode
+        match self.fullscreen_mode {
+            WindowMode::BorderlessFullscreen => {
+                let monitor = window.current_monitor().or_else(|| window.primary_monitor());
+                window.set_fullscreen(Some(Fullscreen::Borderless(monitor)));
+            }
+            WindowMode::ExclusiveFullscreen => {
+                let monitor = window.current_monitor().or_else(|| window.primary_monitor());
+                match monitor {
+                    Some(monitor) => {
+                        if let Some(video_mode) = pick_best_video_mode(&monitor) {
+                            window.set_fullscreen(Some(Fullscreen::Exclusive(video_mode)));
+                        } else {
+                            // fallback to borderless
+                            window.set_fullscreen(Some(Fullscreen::Borderless(Some(monitor))));
+                        }
+                    }
+                    None => {
+                        // no monitor info, fallback to windowed
+                        window.set_fullscreen(None);
+                    }
+                }
+            }
+            WindowMode::Windowed => {
+                window.set_fullscreen(None);
+            },
+        }
+    }
+}
+
+fn pick_best_video_mode(monitor: &MonitorHandle) -> Option<VideoModeHandle> {
+    let target_size = monitor.size();
+
+    let mut best_native: Option<VideoModeHandle> = None;
+    let mut best_any: Option<VideoModeHandle> = None;
+
+    for mode in monitor.video_modes() {
+        if mode.size() == target_size {
+            let replace = match best_native.as_ref() {
+                None => true,
+                Some(best) => {
+                    (mode.refresh_rate_millihertz(), mode.bit_depth())
+                        > (best.refresh_rate_millihertz(), best.bit_depth())
+                }
+            };
+            if replace {
+                best_native = Some(mode.clone());
+            }
+        }
+
+        let replace = match best_any.as_ref() {
+            None => true,
+            Some(best) => is_better_video_mode(&mode, best),
+        };
+        if replace {
+            best_any = Some(mode);
+        }
+    }
+
+    best_native.or(best_any)
+}
+
+fn is_better_video_mode(a: &VideoModeHandle, b: &VideoModeHandle) -> bool {
+    let a_size = a.size();
+    let b_size = b.size();
+    let a_area = u64::from(a_size.width) * u64::from(a_size.height);
+    let b_area = u64::from(b_size.width) * u64::from(b_size.height);
+
+    match a_area.cmp(&b_area) {
+        std::cmp::Ordering::Greater => true,
+        std::cmp::Ordering::Less => false,
+        std::cmp::Ordering::Equal => {
+            (a.refresh_rate_millihertz(), a.bit_depth()) > (b.refresh_rate_millihertz(), b.bit_depth())
+        }
+    }
+}

raidillon_core/Cargo.toml

@@ -1,12 +0,0 @@
-[package]
-name = "raidillon_core"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-glam = "0.30.4"
-hecs = "0.10.5"
-raidillon_render = { path = "../raidillon_render" }
-glium = { version = "0.35.0", features = ["glutin_backend", "simple_window_builder"] }
-raidillon_ecs = { path = "../raidillon_ecs" }
-anyhow = "1.0.98"

raidillon_core/src/assets.rs

@@ -1,42 +0,0 @@
-use std::collections::HashMap;
-use raidillon_render::model::Model;
-use glium::glutin::surface::WindowSurface;
-use glium::Display;
-use raidillon_render::gltf_loader;
-use raidillon_ecs::ModelId;
-use raidillon_render::render_system::ModelProvider;
-use anyhow::Result;
-
-pub struct AssetManager {
-    models: Vec<Model>,
-    model_cache: HashMap<String, ModelId>,
-}
-
-impl AssetManager {
-    pub fn new() -> Self {
-        Self { models: Vec::new(), model_cache: HashMap::new() }
-    }
-
-    /// Load or retrieve a cached model, returning its `ModelId`.
-    pub fn load_model<P: AsRef<str>>(&mut self, path: P, display: &Display<WindowSurface>) -> Result<ModelId> {
-        let path_str = path.as_ref();
-        if let Some(&id) = self.model_cache.get(path_str) {
-            return Ok(id);
-        }
-        let model = gltf_loader::load_gltf(path_str, display)?;
-        let id = ModelId(self.models.len());
-        self.models.push(model);
-        self.model_cache.insert(path_str.to_string(), id);
-        Ok(id)
-    }
-
-    pub fn get_model(&self, id: ModelId) -> Option<&Model> {
-        self.models.get(id.0)
-    }
-}
-
-impl ModelProvider for AssetManager {
-    fn get_model(&self, id: ModelId) -> Option<&Model> {
-        self.get_model(id)
-    }
-} 

raidillon_core/src/events.rs

@@ -1,59 +0,0 @@
-use std::any::TypeId;
-use std::collections::HashMap;
-
-/// Core event enumeration.
-/// Generic over the `Action` type to keep the engine agnostic to concrete
-/// game-specific input enumerations.
-#[derive(Debug, Clone)]
-pub enum GameEvent<A> {
-    InputAction(A),
-    CameraMove { position: glam::Vec3, front: glam::Vec3 },
-    WindowResize { width: u32, height: u32 },
-    EntitySpawned(hecs::Entity),
-}
-
-pub trait EventHandler<A>: 'static {
-    fn handle(&mut self, event: &GameEvent<A>);
-}
-
-pub struct EventBus<A> {
-    events: Vec<GameEvent<A>>,
-    subscribers: HashMap<TypeId, Vec<Box<dyn EventHandler<A>>>>,
-}
-
-impl<A: 'static + Clone> EventBus<A> {
-    pub fn new() -> Self {
-        Self {
-            events: Vec::new(),
-            subscribers: HashMap::new(),
-        }
-    }
-
-    pub fn subscribe<H: EventHandler<A> + 'static>(&mut self, handler: H) {
-        self.subscribers
-            .entry(TypeId::of::<H>())
-            .or_default()
-            .push(Box::new(handler));
-    }
-
-    pub fn emit(&mut self, event: GameEvent<A>) {
-        self.events.push(event);
-    }
-
-    /// Process all queued events, dispatching them to every registered
-    /// subscriber.
-    pub fn process(&mut self) {
-        let events = std::mem::take(&mut self.events);
-        for ev in &events {
-            for subs in self.subscribers.values_mut() {
-                for h in subs {
-                    h.handle(ev);
-                }
-            }
-        }
-    }
-
-    pub fn drain(&mut self) -> Vec<GameEvent<A>> {
-        std::mem::take(&mut self.events)
-    }
-} 

raidillon_core/src/lib.rs

@@ -1,14 +0,0 @@
-pub mod time;
-
-pub use time::Time;
-
-pub mod events;
-
-pub use events::{EventBus, GameEvent, EventHandler};
-
-pub mod assets;
-
-pub use assets::AssetManager;
-
-pub mod systems;
-pub use systems::{System, SystemRegistry};

raidillon_core/src/systems.rs

@@ -1,33 +0,0 @@
-use hecs::World;
-
-use crate::{AssetManager, EventBus};
-
-/// A game/engine system that updates every frame.
-pub trait System<A> {
-    /// Update the system for the current frame.
-    ///
-    /// * `world`  – mutable ECS world
-    /// * `assets` – read-only resource manager
-    /// * `events` – event bus for publishing/consuming game events
-    /// * `dt`     – time delta in seconds
-    fn update(&mut self, world: &mut World, assets: &AssetManager, events: &mut EventBus<A>, dt: f32);
-}
-
-/// Stores and updates a collection of boxed systems.
-pub struct SystemRegistry<A> {
-    systems: Vec<Box<dyn System<A>>>,
-}
-
-impl<A> SystemRegistry<A> {
-    pub fn new() -> Self { Self { systems: Vec::new() } }
-
-    pub fn add_system<S: System<A> + 'static>(&mut self, sys: S) {
-        self.systems.push(Box::new(sys));
-    }
-
-    pub fn update_all(&mut self, world: &mut World, assets: &AssetManager, events: &mut EventBus<A>, dt: f32) {
-        for s in &mut self.systems {
-            s.update(world, assets, events, dt);
-        }
-    }
-} 

raidillon_core/src/time.rs

@@ -1,34 +0,0 @@
-use std::time::{Duration, Instant};
-
-#[derive(Clone, Debug)]
-pub struct Time {
-    last:   Instant,
-    delta:  Duration,
-    total:  Duration,
-}
-
-impl Time {
-    pub fn new() -> Self {
-        let now = Instant::now();
-        Self {
-            last:  now,
-            delta: Duration::ZERO,
-            total: Duration::ZERO,
-        }
-    }
-
-    pub fn tick(&mut self) {
-        let now = Instant::now();
-        self.delta = now - self.last;
-        self.total += self.delta;
-        self.last = now;
-    }
-
-    pub fn delta_seconds(&self) -> f32 {
-        self.delta.as_secs_f32()
-    }
-
-    pub fn total_seconds(&self) -> f32 {
-        self.total.as_secs_f32()
-    }
-}

raidillon_ecs/Cargo.toml

@@ -1,8 +0,0 @@
-[package]
-name = "raidillon_ecs"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-hecs = { version = "0.10.5", features = ["macros"] }
-glam = "0.30.4"

raidillon_ecs/src/lib.rs

@@ -1,19 +0,0 @@
-use glam::{Mat4, Quat, Vec3};
-
-#[derive(Copy, Clone)]
-pub struct Transform {
-    pub translation: Vec3,
-    pub rotation:    Quat,
-    pub scale:       Vec3,
-}
-
-impl Transform {
-    pub fn matrix(&self) -> Mat4 {
-        Mat4::from_scale_rotation_translation(self.scale, self.rotation, self.translation)
-    }
-}
-
-#[derive(Copy, Clone)]
-pub struct ModelId(pub usize);
-
-pub type ModelHandle = ModelId;

raidillon_game/Cargo.toml

@@ -1,16 +0,0 @@
-[package]
-name = "raidillon_game"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-anyhow = "1.0.98"
-glam   = "0.30.4"
-winit = "0.30"
-raidillon_render = { path = "../raidillon_render" }
-raidillon_ecs    = { path = "../raidillon_ecs" }
-raidillon_ui     = { path = "../raidillon_ui" }
-raidillon_core  = { path = "../raidillon_core" }
-hecs = "0.10.5"
-raidillon_input = { path = "../raidillon_input" }
-glium = { version = "0.35.0", features = ["glutin_backend", "simple_window_builder"] }

raidillon_game/src/engine.rs

@@ -1,90 +0,0 @@
-use hecs::{World, Entity};
-use glium::Surface;
-use raidillon_render::{RenderSystem, window::DisplayHandle, Camera};
-use raidillon_input::{InputSystem, CameraSystem, Action};
-use raidillon_core::{Time, AssetManager, EventBus, SystemRegistry};
-use glam::{Vec3, Quat};
-
-pub struct Engine {
-    world: World,
-    assets: AssetManager,
-    events: EventBus<Action>,
-    systems: SystemRegistry<Action>,
-    render_system: RenderSystem,
-    input_system: InputSystem,
-    time: Time,
-    camera_entity: Entity,
-}
-
-impl Engine {
-    pub fn new(display: &DisplayHandle) -> anyhow::Result<Self> {
-        let mut world = World::new();
-        let mut assets = AssetManager::new();
-        let events = EventBus::new();
-        let mut systems = SystemRegistry::new();
-        let render_system = RenderSystem::new(display.clone())?;
-        let input_system = InputSystem::new();
-        let time = Time::new();
-
-        let tree_model = assets.load_model("resources/models/tree.gltf", render_system.display())?;
-        let ground_model = assets.load_model("resources/models/plane.gltf", render_system.display())?;
-
-        world.spawn((raidillon_ecs::Transform {
-            translation: Vec3::new(0.0, -2.5, -5.0),
-            rotation:    Quat::IDENTITY,
-            scale:       Vec3::splat(0.01),
-        }, tree_model));
-
-        world.spawn((raidillon_ecs::Transform {
-            translation: Vec3::new(0.0, -1.5, 0.0),
-            rotation:    Quat::IDENTITY,
-            scale:       Vec3::ONE,
-        }, ground_model));
-
-        let camera_entity = world.spawn((Camera {
-            eye:    Vec3::new(0.0, 0.0, 2.0),
-            center: Vec3::ZERO,
-            up:     Vec3::Y,
-            fovy:   60_f32.to_radians(),
-            aspect: 1280.0 / 720.0,
-            znear:  0.1,
-            zfar:   100.0,
-        },));
-
-        systems.add_system(CameraSystem::new(camera_entity));
-
-        Ok(Self {
-            world,
-            assets,
-            events,
-            systems,
-            render_system,
-            input_system,
-            time,
-            camera_entity,
-        })
-    }
-
-    pub fn handle_event<T>(&mut self, event: &winit::event::Event<T>) {
-        self.input_system.handle_event(event);
-        if let winit::event::Event::WindowEvent { event, .. } = event {
-            if let winit::event::WindowEvent::Resized(sz) = event {
-                if let Ok(mut cam) = self.world.query_one_mut::<&mut Camera>(self.camera_entity) {
-                    cam.aspect = sz.width as f32 / sz.height as f32;
-                }
-            }
-        }
-    }
-
-    pub fn update(&mut self) {
-        self.time.tick();
-        let dt = self.time.delta_seconds();
-        self.input_system.update(&mut self.events);
-        self.systems.update_all(&mut self.world, &self.assets, &mut self.events, dt);
-        let _ = self.events.drain();
-    }
-
-    pub fn render_into<S: Surface>(&mut self, target: &mut S) {
-        self.render_system.render_into(&self.world, &self.assets, target);
-    }
-} 

raidillon_game/src/main.rs

@@ -1,50 +0,0 @@
-use anyhow::Result;
-use raidillon_render::{init_render_window, DisplayHandle};
-use raidillon_ui::Gui;
-mod engine;
-use crate::engine::Engine;
-
-
-fn main() -> Result<()> {
-    let event_loop = winit::event_loop::EventLoop::builder()
-        .build()
-        .expect("create event-loop");
-
-    let (window, display): (winit::window::Window, DisplayHandle) = init_render_window(&event_loop, "raidillon", (1280, 720))?;
-
-    let mut engine = Engine::new(&display)?;
-
-    let mut gui = Gui::new(&display, &window)?;
-
-    event_loop
-        .run(move |event, el| {
-            use winit::event::{Event};
-
-            gui.handle_event(&window, &event);
-
-            engine.handle_event(&event);
-
-            match event {
-                Event::WindowEvent { event, .. } => {
-                    if let winit::event::WindowEvent::CloseRequested = event {
-                        el.exit();
-                    }
-                }
-                Event::WindowEvent { .. } => {}
-                Event::AboutToWait => {
-                    engine.update();
-
-                    // Render
-                    let mut target = display.as_inner().draw();
-                    engine.render_into(&mut target);
-                    gui.render_with(&mut target, &window, |_| {});
-                    target.finish().unwrap();
-
-                    gui.prepare_frame(&window);
-                    window.request_redraw();
-                }
-                _ => {}
-            }
-        })
-        .map_err(Into::into)
-}

raidillon_input/Cargo.toml

@@ -1,11 +0,0 @@
-[package]
-name = "raidillon_input"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-winit = "0.30" 
-glam = "0.30.4" 
-raidillon_core = { path = "../raidillon_core" } 
-hecs = "0.10.5"
-raidillon_render = { path = "../raidillon_render" }