feat(lib): expose Camera and Entity with Transform (data foundation)

Étape 1 du plan 3D+Phong : fondations de données sans toucher au rendu. - resources: exporte Camera (fichier auparavant orphelin), migre les fonctions glam dépréciées look_at_rh/perspective_rh_gl vers glam::camera::rh::* (induit par la compilation de camera.rs, sinon 2 warnings). - scene: nouveau type Entity { mesh_id, material_id, transform } (scene/entity.rs); Scene::entities passe de HashMap<String,(String,String)> à HashMap<String,Entity>. - API: add_entity conserve sa signature (transform identité par défaut), ajout de add_entity_with_transform, entity_transform, set_entity_transform; iter_entities rend désormais aussi le &Transform. renderer et examples inchangés a posteriori. - Validation: cargo check --workspace et examples 0 warning, cargo doc 0 warning, fmt OK.
docs: note pour mémoire sur le couplage au runtime async (pollster)
2026-09-16 15:26:16 +02:00 · 2026-09-16 14:58:51 +02:00 · 2026-09-16 14:17:11 +02:00 · 2026-09-16 13:40:30 +02:00 · 2026-09-16 12:06:56 +02:00 · 2026-09-16 11:46:33 +02:00
17 changed files with 1047 additions and 634 deletions
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@@ -1331,6 +1517,22 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8fadd59c855ef2080decdef8ff161eb6661b86933c9d82e5ba29dc602a55aba"
 [[package]]
 name = "simd_cesu8"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "11031e251abf8611c80f460e19dbdeb54a66db918e49c65a7065b46ac7aec520"
 dependencies = [
 "rustc_version",
 "simdutf8",
 ]
 [[package]]
 name = "simdutf8"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3a9fe34e3e7a50316060351f37187a3f546bce95496156754b601a5fa71b76e"
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -1354,9 +1556,9 @@ checksum = "8ed6a63f02c8539c91a8685a86f4099661ba3da017932f6ebbea6de3f0fa7c90"
 [[package]]
 name = "smithay-client-toolkit"
-version = "0.18.1"
+version = "0.19.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "922fd3eeab3bd820d76537ce8f582b1cf951eceb5475c28500c7457d9d17f53a"
+checksum = "3457dea1f0eb631b4034d61d4d8c32074caa6cd1ab2d59f2327bd8461e2c0016"
 dependencies = [
 "bitflags 2.13.0",
 "calloop",
@@ -1522,6 +1724,22 @@ dependencies = [
 "winnow",
 ]
 [[package]]
 name = "tracing"
 version = "0.1.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "63e71662fa4b2a2c3a26f570f037eb95bb1f85397f3cd8076caed2f026a6d100"
 dependencies = [
 "pin-project-lite",
 "tracing-core",
 ]
 [[package]]
 name = "tracing-core"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "db97caf9d906fbde555dd62fa95ddba9eecfd14cb388e4f491a66d74cd5fb79a"
 [[package]]
 name = "ttf-parser"
 version = "0.25.1"
@@ -1676,9 +1894,9 @@ dependencies = [
 [[package]]
 name = "wayland-protocols"
-version = "0.31.2"
+version = "0.32.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f81f365b8b4a97f422ac0e8737c438024b5951734506b0e1d775c73030561f4"
+checksum = "23d0c813de3daa2ed6520af85a3bd49b0e722a3078506899aa9686fea58dc4b6"
 dependencies = [
 "bitflags 2.13.0",
 "wayland-backend",
@@ -1688,9 +1906,9 @@ dependencies = [
 [[package]]
 name = "wayland-protocols-plasma"
-version = "0.2.0"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23803551115ff9ea9bce586860c5c5a971e360825a0309264102a9495a5ff479"
+checksum = "2b6d8cf1eb2c1c31ed1f5643c88a6e53538129d4af80030c8cabd1f9fa884d91"
 dependencies = [
 "bitflags 2.13.0",
 "wayland-backend",
@@ -1701,9 +1919,9 @@ dependencies = [
 [[package]]
 name = "wayland-protocols-wlr"
-version = "0.2.0"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad1f61b76b6c2d8742e10f9ba5c3737f6530b4c243132c2a2ccc8aa96fe25cd6"
+checksum = "eb04e52f7836d7c7976c78ca0250d61e33873c34156a2a1fc9474828ec268234"
 dependencies = [
 "bitflags 2.13.0",
 "wayland-backend",
@@ -1747,9 +1965,9 @@ dependencies = [
 [[package]]
 name = "web-time"
-version = "0.2.4"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa30049b1c872b72c89866d458eae9f20380ab280ffd1b1e18df2d3e2d98cfe0"
+checksum = "5a6580f308b1fad9207618087a65c04e7a10bc77e02c8e84e9b00dd4b12fa0bb"
 dependencies = [
 "js-sys",
 "wasm-bindgen",
@@ -1765,7 +1983,7 @@ dependencies = [
 "bitflags 2.13.0",
 "bytemuck",
 "cfg-if",
- "cfg_aliases 0.2.1",
+ "cfg_aliases",
 "document-features",
 "hashbrown 0.17.1",
 "js-sys",
@@ -1796,7 +2014,7 @@ dependencies = [
 "bit-vec",
 "bitflags 2.13.0",
 "bytemuck",
- "cfg_aliases 0.2.1",
+ "cfg_aliases",
 "document-features",
 "hashbrown 0.17.1",
 "indexmap",
@@ -1860,7 +2078,7 @@ dependencies = [
 "block2 0.6.2",
 "bytemuck",
 "cfg-if",
- "cfg_aliases 0.2.1",
+ "cfg_aliases",
 "glow",
 "glutin_wgl_sys",
 "gpu-allocator",
@@ -1872,13 +2090,13 @@ dependencies = [
 "log",
 "naga",
 "naga-types",
- "ndk-sys 0.6.0+11769913",
+ "ndk-sys",
 "objc2 0.6.4",
 "objc2-core-foundation",
 "objc2-core-graphics",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
- "objc2-metal",
+ "objc2-metal 0.3.2",
- "objc2-quartz-core",
+ "objc2-quartz-core 0.3.2",
 "once_cell",
 "ordered-float",
 "parking_lot",
@@ -2040,20 +2258,11 @@ dependencies = [
 [[package]]
 name = "windows-sys"
-version = "0.45.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
 dependencies = [
- "windows-targets 0.42.2",
+ "windows-targets",
 ]
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
 "windows-targets 0.48.5",
 ]
 [[package]]
@@ -2062,7 +2271,7 @@ version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
 dependencies = [
- "windows-targets 0.52.6",
+ "windows-targets",
 ]
 [[package]]
@@ -2074,50 +2283,20 @@ dependencies = [
 "windows-link",
 ]
 [[package]]
 name = "windows-targets"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
 dependencies = [
 "windows_aarch64_gnullvm 0.42.2",
 "windows_aarch64_msvc 0.42.2",
 "windows_i686_gnu 0.42.2",
 "windows_i686_msvc 0.42.2",
 "windows_x86_64_gnu 0.42.2",
 "windows_x86_64_gnullvm 0.42.2",
 "windows_x86_64_msvc 0.42.2",
 ]
 [[package]]
 name = "windows-targets"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
 dependencies = [
 "windows_aarch64_gnullvm 0.48.5",
 "windows_aarch64_msvc 0.48.5",
 "windows_i686_gnu 0.48.5",
 "windows_i686_msvc 0.48.5",
 "windows_x86_64_gnu 0.48.5",
 "windows_x86_64_gnullvm 0.48.5",
 "windows_x86_64_msvc 0.48.5",
 ]
 [[package]]
 name = "windows-targets"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
 dependencies = [
- "windows_aarch64_gnullvm 0.52.6",
+ "windows_aarch64_gnullvm",
- "windows_aarch64_msvc 0.52.6",
+ "windows_aarch64_msvc",
- "windows_i686_gnu 0.52.6",
+ "windows_i686_gnu",
 "windows_i686_gnullvm",
- "windows_i686_msvc 0.52.6",
+ "windows_i686_msvc",
- "windows_x86_64_gnu 0.52.6",
+ "windows_x86_64_gnu",
- "windows_x86_64_gnullvm 0.52.6",
+ "windows_x86_64_gnullvm",
- "windows_x86_64_msvc 0.52.6",
+ "windows_x86_64_msvc",
 ]
 [[package]]
@@ -2129,54 +2308,18 @@ dependencies = [
 "windows-link",
 ]
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 [[package]]
 name = "windows_aarch64_gnullvm"
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 checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 [[package]]
 name = "windows_i686_gnu"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
 [[package]]
 name = "windows_i686_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 [[package]]
 name = "windows_i686_gnu"
 version = "0.52.6"
@@ -2189,72 +2332,24 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 [[package]]
 name = "windows_i686_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 [[package]]
 name = "windows_i686_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.52.6"
@@ -2263,37 +2358,41 @@ checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 [[package]]
 name = "winit"
-version = "0.29.15"
+version = "0.30.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d59ad965a635657faf09c8f062badd885748428933dad8e8bdd64064d92e5ca"
+checksum = "a6755fa58a9f8350bd1e472d4c3fcc25f824ec358933bba33306d0b63df5978d"
 dependencies = [
 "ahash",
 "android-activity",
 "atomic-waker",
 "bitflags 2.13.0",
 "block2 0.5.1",
 "bytemuck",
 "calloop",
- "cfg_aliases 0.1.1",
+ "cfg_aliases",
 "concurrent-queue",
 "core-foundation",
 "core-graphics",
 "cursor-icon",
- "icrate",
+ "dpi",
 "js-sys",
 "libc",
 "log",
 "memmap2",
 "ndk",
- "ndk-sys 0.5.0+25.2.9519653",
+ "objc2 0.5.2",
- "objc2 0.4.1",
+ "objc2-app-kit",
- "once_cell",
+ "objc2-foundation 0.2.2",
 "objc2-ui-kit",
 "orbclient",
 "percent-encoding",
 "pin-project",
 "raw-window-handle",
- "redox_syscall 0.3.5",
+ "redox_syscall 0.4.1",
 "rustix 0.38.44",
 "sctk-adwaita",
 "smithay-client-toolkit",
 "smol_str",
 "tracing",
 "unicode-segmentation",
 "wasm-bindgen",
 "wasm-bindgen-futures",
@@ -2303,7 +2402,7 @@ dependencies = [
 "wayland-protocols-plasma",
 "web-sys",
 "web-time",
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 "x11-dl",
 "x11rb",
 "xkbcommon-dl",
@@ -2,15 +2,15 @@
 WSG is a Rust library that wraps [wgpu](https://github.com/gfx-rs/wgpu) and [winit](https://crates.io/crates/winit) for simple GPU drawing. It groups the five core wgpu objects (Instance, Surface, Adapter, Device, Queue) behind a single `Context`, adds small building blocks (`Mesh`, `Material`, `PipelineCache`, `Frame`), and exposes the low-level primitives for advanced users.
-> **Status: unstable development version.** The manual workflow below is fully working. The high-level "declarative" workflow and the GPU-driven two-pass pipeline described in the architecture docs are **not implemented yet** — see [Status](#status) and [Roadmap](#roadmap).
+> **Status: unstable development version.** The manual workflow below is fully working, and the high-level "declarative" workflow (automatic `App` scene rendering) works for flat/NDC drawing. The GPU-driven two-pass pipeline described in the architecture docs is **not implemented yet** — see [Status](#status) and [Roadmap](#roadmap).
 ## Status
 | Area | State |
 |------|-------|
 | Manual workflow (`Context` + `Renderer` + `PipelineCache`) | ✅ Working |
-| `App` / `AppBuilder` / `AppHandler` event-loop facade | 🚧 Scaffold — window, events and frame presentation work, but the `render()` callback cannot draw yet (the per-frame view is not exposed to it) |
+| `App` / `AppBuilder` / `AppHandler` event-loop facade | ✅ Working — window, events, frame presentation, and **automatic scene rendering** (the per-frame view is exposed via `Frame::view()`) |
-| `Scene` resource/entity registry | 🚧 Registration API works; the engine does not render the scene yet |
+| `Scene` resource/entity registry | ✅ Working — the engine renders every registered entity automatically in one batched render pass (`App::render_scene`) |
 | GPU-driven two-pass pipeline (Compute → indirect draw) | 📋 Roadmap — spec in [docs/tech/ARCHI_CPU_GPU.md](docs/tech/ARCHI_CPU_GPU.md) |
 | 3D transforms (MVP uniforms, camera in the pipeline) | 📋 Roadmap — the bundled shader draws positions straight to NDC today |
@@ -83,21 +83,19 @@ struct MyGame;
 impl AppHandler for MyGame {
    // update() has an empty default — implement it to mutate scene state each frame.
-    fn render(&mut self, _app: &mut App) {
+    // render(app, frame) has a default that draws the whole scene automatically via
-        // The engine acquires and presents the frame around this callback,
+    // app.render_scene(frame.view()). You don't need to implement it for the common case.
        // but scene rendering is not automated yet — see Roadmap.
    }
 }
 #[pollster::main]
 async fn main() -> Result<(), wsg_lib::utils::WsgError> {
    let app = AppBuilder::new().build().await?;
-    // Scene registration is available (string IDs):
+    // Register your scene once (string IDs), then App renders it automatically each frame:
    //   app.cache.register_shader("basic", wsg_lib::utils::BASIC_SHADER_PATH)?;
    //   app.scene.add_mesh("quad", Arc::new(mesh))?;
-    //   app.scene.add_material("mat", Arc::new(material))?;
+    //   app.scene.add_material("mat", Arc::new(Material::new(app.renderer.format(), "basic", &mut app.cache)))?;
    //   app.scene.add_entity("my_quad", "quad", "mat")?;
    // ...but the engine will not draw them until the declarative pipeline lands.
    app.run(MyGame)
 }
@@ -109,7 +107,7 @@ async fn main() -> Result<(), wsg_lib::utils::WsgError> {
 ## Architecture overview
 - **Manager layer (`Context`)** — owns the GPU hardware lifecycle (Instance → Surface → Adapter → Device → Queue). Created once at startup; `configure()` sets up the swapchain, `Frame` wraps each frame's surface texture + view.
- **Executor layer (`Renderer`)** — binds a `Material` pipeline + `Mesh` buffers into a RenderPass and submits the commands. Today this is one encoder + one submit **per object**.
+- **Executor layer (`Renderer`)** — binds a `Material` pipeline + `Mesh` buffers into a RenderPass and submits the commands. Rendering a whole `Scene` (`render_scene`) batches all entities into **one encoder + one submit per frame**; the low-level `render` still allocates one per object.
 - **Supporting pieces** — `PipelineCache` (shader → compiled RenderPipeline, `Arc`-shared), `Material`, `Mesh`/`Vertex`, `Scene` (string-ID registry), `Camera`/`Transform` (types only, not yet used by the pipeline).
 The planned target architecture — a GPU-driven two-pass pipeline (Compute Pass: world matrices + frustum culling → Indirect Draw Buffer, then a single `draw_indexed_indirect` per frame) — is specified in [docs/tech/ARCHI_APP.md](docs/tech/ARCHI_APP.md) and [docs/tech/ARCHI_CPU_GPU.md](docs/tech/ARCHI_CPU_GPU.md) but is **not implemented yet**.
@@ -118,11 +116,11 @@ The planned target architecture — a GPU-driven two-pass pipeline (Compute Pass
 | Concept | Type | Responsibility | Status |
 |---------|------|---------------|--------|
-| App / AppBuilder | Facade | Window lifecycle + winit event loop + frame presentation | 🚧 Scaffold (no scene rendering) |
+| App / AppBuilder | Facade | Window lifecycle + winit event loop + frame presentation | ✅ (auto scene rendering via `App::render_scene`) |
-| AppHandler | Trait | User-defined `update()` / `render()` callbacks | ✅ (render() has no frame access yet) |
+| AppHandler | Trait | User-defined `update()` / `render()` callbacks | ✅ (`Frame::view()` exposed; default `render` draws the scene) |
-| Scene | Struct | String-ID registry: meshes, materials, entities | 🚧 Registration only |
+| Scene | Struct | String-ID registry: meshes, materials, entities | ✅ (registry auto-rendered by the facade) |
 | Context | Struct | GPU hardware lifecycle (Instance, Surface, Adapter, Device, Queue) | ✅ |
-| Renderer | Struct | Binds Material + Mesh into a RenderPass, submits | ✅ (one submit per object) |
+| Renderer | Struct | Binds Material + Mesh into a RenderPass, submits | ✅ (`render_scene` batches one pass/frame) |
 | PipelineCache | Struct | Shader → compiled RenderPipeline cache | ✅ |
 | Material | Struct | Shader ID → RenderPipeline | ✅ |
 | Mesh / Vertex | Struct | GPU geometry container / CPU-side vertex tuple | ✅ |
@@ -145,7 +143,7 @@ pollster = "0.4"   # only if you use the async AppBuilder
 | Run the working example | `cargo run -p wsg-lib --example manual` |
 | Check everything (incl. examples) | `cargo check --all-targets` |
-The `manual` example is the reference for the working, pixel-rendering workflow. The `simple` example (App facade) now compiles and opens a window with a running update → render → present loop, but it does not draw a scene yet (see [Roadmap](#roadmap)).
+The `manual` example is the reference for the low-level workflow. The `simple` example (App facade) registers a colored quad and renders it automatically through the declarative path — it draws a scene without importing wgpu.
 ## Documentation
@@ -159,7 +157,7 @@ The architecture docs live in `docs/tech/` and are written in **French**. Each d
 ## Roadmap
-1. **Scene auto-rendering** — `App`/`Renderer` iterate registered entities and draw them in one encoder/submit per frame; expose the frame view to `AppHandler::render` for custom draws.
+1. ✅ **Scene auto-rendering** — `App::render_scene` iterates registered entities and draws them in one encoder/submit per frame; the frame view is exposed to `AppHandler::render` for custom draws. (Done 2026-09-16.)
 2. **GPU-driven two-pass pipeline** — Compute Pass (world matrices + frustum culling) filling an indirect draw buffer, single `draw_indexed_indirect` (see ARCHI_CPU_GPU).
 3. **CPU→GPU transform sync** — persistent transform buffers with ring (triple) buffering.
 4. **Real 3D pipeline** — MVP uniforms + camera support in the vertex shader.
@@ -1,154 +1,127 @@
-# DRAFT — Brouillon d'implémentation
+# DRAFT — Plan d'implémentation : « 3D + éclairage Phong »
-> **Usage.** Ce fichier (dans `docs/`) sert de brouillon pour noter les idées et le plan détaillé de l'étape
+> **Usage.** Ce fichier (dans `docs/`) sert de brouillon pour le plan détaillé de l'étape en cours.
-> en cours. **Son contenu est effacé au début de chaque nouvelle étape.** La source de vérité de l'état est
+> **Son contenu est effacé au début de chaque nouvelle étape.** La source de vérité de l'état est
 > le code + README.md ; les autres docs `docs/*` restent stables.
 >
 > **Étape.** 3D + éclairage Phong (ROADMAP 1.3 + 1.5). Objectif MVP : **un mesh 3D éclairé à l'écran**,
 > rendu automatiquement par la boucle `App` (Scene auto-render déjà en place).
 >
 > **État de départ vérifié.**
 > - Rendu automatique fonctionnel mais **plat** : `basic_shader.wgsl` pose les positions telles quelles
 >   (`vec4(position, 1.0)`), aucune matrice, aucune uniform, aucun éclairage.
 > - `Renderer::render_scene` parcourt `iter_entities()` en une passe (`&self`, `&Scene`), sans transform.
 > - `Scene::entities` : `HashMap<String, (mesh_id, material_id)>` — pas de `Transform` par entité.
 > - `Camera` (`resources/camera.rs`) : **fichier orphelin, non exporté** (absent de `resources/mod.rs`) ;
 >   `Transform`/`Geometry` exportés via `math`.
 > - `PipelineCache::build_pipeline` : `bind_group_layouts: &[]`, `immediate_size: 0` — aucun binding.
 > - Défaut latente : `basic_shader.wgsl` déclare `@location(1) uv`, `(2) color` alors que le
 >   `VertexBufferLayout` réel expose `(1) normal`, `(2) uv`, `(3) color`.
 ---
-# Étape : Rendu automatique de la scène + vue de frame exposée
+## Étape 1 — Fondations data : Transform + Camera exposées
-## 1. Contexte (état réel au 2026-09-16)
+**But** : donner à chaque entité un `Transform` et rendre `Camera` utilisable via l'API publique, **sans**
 toucher au rendu (pure façade de données, validable par compilation).
- `App::run()` : acquiert `Frame` via `context.get_next_frame()`, appelle `handler.render(&mut self)`,
+- [X] 1.1 **Exporter `Camera`** : dans `lib/src/resources/mod.rs`, ajouter
-  puis `renderer.present(frame)`.
+  `pub mod camera;` et `pub use camera::Camera;` (aujourd'hui fichier orphelin non compilé). *(fait — 2026-09-16)*
- ⚠️ `handler.render()` ne reçoit **pas** la frame : le callback ne peut rien dessiner. C'est précisément
+- [X] 1.2 **Type `Entity` + transform** : nouvelle struct
-  le point bloquant signalé par `docs/PLAN.md` (§ Phase 2 intégra Scene, check-list) et `docs/ROADMAP.md`
+  `Entity { mesh_id: String, material_id: String, transform: Transform }` (module `scene` ou `resources`).
-  (point de départ : « render() ne peut pas encore dessiner — vue de frame non exposée »).
+  Remplacer `Scene::entities: HashMap<String, (String, String)>` par
- `Renderer::render(view, mesh, material)` existe et fonctionne (usage bas-niveau dans `manual.rs`) :
+  `HashMap<String, Entity>`. Sérialiser `iter_entities()` pour rendre le `&Transform`.
-  il ouvre 1 encoder + 1 render pass par objet, dessine, soumet.
+  *(fait — `lib/src/scene/entity.rs`)*
- `Scene` a déjà : `add_mesh`, `add_material`, `add_entity`, `iter_entities() -> (label, mesh, mat)`,
+- [X] 1.3 **Compat API** : garder `add_entity(label, mesh_id, material_id)` (transform identité par défaut)
-  `get_mesh`, `get_material`, `remove_entity`.
+  + ajouter `add_entity_with_transform(label, mesh_id, material_id, transform)`.
- `Material` porte déjà sa `Arc<RenderPipeline>` (compilée via `PipelineCache`). La scène stocke des
+  Ajouter `entity_transform(label) -> Option<&Transform>` et `set_entity_transform(label, transform)`.
-  `Arc<Material>`. Donc pour dessiner une scène, le code n'a **pas** besoin de consulter le cache :
+  *(fait — 2026-09-16)*
-  chaque matériau détient sa pipeline. Le « lien PipelineCache → Scene » du PLAN est donc **conceptuel**,
+- [X] **Validation** : `cargo check --workspace` 0 warning ; `cargo doc --no-deps` 0 warning ; les exemples
-  pas indispensable côté rendu pour cette étape.
+  `simple`/`manual` compilent inchangés (défaut : identité ⇒ même rendu). *(fait — 0 warning. Au passage,
  `camera.rs` étant désormais compilée, les fonctions glam dépréciées `look_at_rh`/`perspective_rh_gl` ont été
  migrées vers `glam::camera::rh::view::look_at_mat4` / `glam::camera::rh::proj::opengl::perspective`.)*
-## 2. Objectif
+## Étape 2 — Shader Phong `standard_shader.wgsl`
-1. Que `AppHandler::render()` reçoive la vue/frame courante.
+**But** : produire un rendu 3D éclairé via un nouveau shader, sans encore le brancher.
 2. Que la scène se rende automatiquement (`app.render(scene)`), sans que `simple.rs` touche à wgpu.
 3. Que `simple.rs` affiche le quad (4 sommets, 6 indices, matériau `basic`), en gardant ~15 lignes.
-## 3. Plan d'implémentation (détail, dans l'ordre)
+- [ ] 2.1 **Créer `lib/src/shaders/standard_shader.wgsl`** avec le **contrat vertex correct** :
  `@location(0) position : vec3`, `(1) normal : vec3`, `(2) uv : vec2`, `(3) color : vec4`.
  - `@group(0) @binding(0)` : `FrameUniforms { view: mat4, proj: mat4, cam_pos: vec4, light_dir: vec4, light_color: vec4 }`
  - `@group(1) @binding(0)` : `ObjectUniform { model: mat4 }`
  - `vs_main` : `clip_position = proj * view * model * vec4(position,1)` ; passe `normal`/`color` en espace monde.
  - `fs_main` : éclairage hémisphérique (ambient) + diffuse directionnel (max(dot(N,L),0)), sortie `vec4(color*light, 1)`.
  - **Mode unlit** : un flag dans `FrameUniforms` (ou `light_color` nul) **neutralise la directionnelle** → couleur
    plate. Ainsi « 2D » = `standard` non-éclairé, **cas particulier de la 3D** (décision actée).
 - [ ] 2.2 **Constantes** : ajouter `STANDARD_SHADER_PATH = "assets/shaders/standard_shader.wgsl"` et
  `STANDARD_SHADER: &str = include_str!("../shaders/standard_shader.wgsl")` dans `lib/src/utils/conf.rs`.
 - [ ] 2.3 **Migrer `basic` vers le mode unlit de `standard`** (défaut latente réglée) : plus de pipeline au
  **layout vide séparé**. Le rendu plat = `standard` non-éclairé (identité/ortho + ambiance) sous le **même
  layout uniformisé**. Le fallback embarqué (`BASIC_SHADER`) devient la variante unlit de `standard`.
 - [ ] **Validation** : nouveau `shaders/mod.rs` si include_str le requiert ; `cargo check` OK (le shader n'est
  pas encore compilé par un pipeline tant que l'Étape 3 ne le charge pas).
-### Étape 3.1 — Exposer la vue de frame au callback
+## Étape 3 — Infrastructure uniforms dans le `PipelineCache`
-**Fichier** : `lib/src/handler.rs` (+ `app.rs`).
+**But** : permettre aux pipelines de recevoir des uniforms (bind groups) au lieu de `bind_group_layouts: &[]`.
-Changer la signature :
+- [ ] 3.1 **Types bytemuck `Pod`** (nouveau `lib/src/resources/uniform.rs`, ou `math/uniform.rs`) :
-```rust
+  - `#[repr(C)] #[derive(Pod, Zeroable, Copy, Clone)] FrameUniforms` (voir 2.1)
-fn render(&mut self, app: &mut App, frame: &Frame);
+  - `#[repr(C)] #[derive(...)] ObjectUniform { model: Mat4 }`
-```
+  - (alignement 16 octets : utiliser `Vec4`/tableaux pour éviter le padding). Exporter via le `mod.rs` concerné.
- `Frame` est un type de bibliothèque (`core::Frame`) qui expose `frame.view()` → `&wgpu::TextureView`.
+- [ ] 3.2 **Bind group layouts** : dans `build_pipeline`, créer 2 `BindGroupLayout`
-  C'est plus riche et plus stable que de passer le `TextureView` brut : on garde une API bibliothèque.
+  (frame @0 + object @1, chacun avec un buffer uniform `Vertex`/`Fragment`/`Vertex|Fragment` selon usage) et les
- Adapter `handler.rs` docs (consignes `docs/DOCUMENTATION.md` : backticks, description ≤3 lignes,
+  passer dans `PipelineLayoutDescriptor.bind_group_layouts`. `immediate_size` reste 0 (pas de `var<immediate>`).
-  ce que/qui/quand).
+- [ ] 3.3 **Acté : un seul layout pour tous** (option A). `build_pipeline` attache **toujours** les 2 bind groups
  (frame @0 + object @1). Plus de famille `basic` au layout vide : tout matériau partage le même layout
  uniformisé. `manual`/quad plat migrent (Étape 5).
 - [ ] **Validation** : `cargo check` 0 warning ; `cargo doc` 0 warning (types documentés, `missing_docs` actif).
-**Fichier** : `lib/src/app.rs`, dans `App::run`, branche `RedrawRequested` :
+## Étape 4 — Rendu 3D dans le `Renderer`
 ```rust
 let frame = self.context.get_next_frame();
 handler.render(&mut self, &frame); // frame est owned (valeur locale) → pas de conflit de borrow avec &mut self
 self.renderer.present(frame);
 ```
 > Point d'attention borrow : `frame` est une valeur *owned* détachée de `self.context` une fois acquise,
 > on peut donc la passer par référence en même temps que `&mut self` sans erreur du borrow checker.
-### Étape 3.2 — Méthode de rendu de scène groupé
+**But** : `render_scene` applique matrices + éclairage par entité.
-**Fichier** : `lib/src/core/renderer.rs`.
+- [ ] 4.1 **Buffers frame partagés** : créer le `wgpu::Buffer` `FrameUniforms` + `BindGroup(0)` dans
  `Renderer::new` (ou à la 1re frame). Écrire chaque frame : view/proj (caméra active) + lumière.
 - [ ] 4.2 **Buffers object par entité** : `Renderer` maintient un cache
  `RefCell<HashMap<String, (wgpu::Buffer, wgpu::BindGroup)>>` clefé par label d'entité (créé à la 1re rencontre),
  car `render_scene(&self, &Scene)` est immuable. Chaque frame : écrire `ObjectUniform.world = entity.transform.to_matrix()` + `set_bind_group(1, ...)`.
 - [ ] 4.3 **Caméra active** : ajouter `scene.set_active_camera(Camera)` / `scene.active_camera() -> Option<&Camera>`.
  Calcul du `proj` avec l'aspect de la fenêtre (`window.inner_size()` accessible via `App.window`).
 - [ ] 4.4 **`draw_entity` étendu** : `set_bind_group(0, frame_bg)` + `set_bind_group(1, object_bg)` avant le draw,
  pour **tout** matériau (layout unique). Le chemin bas-niveau `Renderer::render` pose aussi les 2 bind groups
  (frame partagé + object du mesh appelant).
 - [ ] **Validation** : `cargo check` 0 warning ; exécution `simple` (sans panique, boucle active) ;
  `manual` non-régressif (chemin bas-niveau).
-Le `Renderer::render(view, mesh, material)` actuel ouvre un encoder+pass **par objet** (N submits par frame
+## Étape 5 — Exemple 3D (cube éclairé)
 si appelé en boucle). Pour rendre une scène entière proprement, ajouter un rendu **batch** :
-```rust
+**But** : démontrer l'objectif MVP à l'écran et **migrer** les exemples sur le pipeline unifié.
 pub fn render_scene(&self, view: &wgpu::TextureView, scene: &Scene) {
    let mut encoder = self.device.create_command_encoder(...);
    {
        let mut pass = encoder.begin_render_pass(/* color attachment: view */);
        for (_label, mesh, material) in scene.iter_entities() {
            pass.set_pipeline(&material.pipeline);
            pass.set_vertex_buffer(0, mesh.vertex_buffer.slice(..));
            if let Some(ib) = &mesh.index_buffer {
                pass.set_index_buffer(ib.slice(..), wgpu::IndexFormat::Uint16);
                pass.draw_indexed(0..mesh.num_indices, 0, 0..1);
            } else {
                pass.draw(0..mesh.num_vertices, 0..1);
            }
        }
    }
    self.queue.submit(once(encoder.finish()));
 }
 ```
 - **Batching** : un seul pass pour toutes les entités (aligné sur le principe « batching par matériau »
  évoqué dans renderer.rs / README Phase 4.3). On évite N submits/encoder alloués à la volée.
 - Conserver `render(view, mesh, material)` (API bas-niveau utilisée par `manual.rs`). Le battle placer du code commun (layout pass / draw d'un mesh) dans un petit helper privé pour éviter la duplication.
 - Import `crate::scene::Scene`.
 - Documenter selon `docs/DOCUMENTATION.md`.
-### Étape 3.3 — Automatisation côté App
+- [ ] 5.1 **Nouvel exemple `lib/examples/cube.rs`** : cube unitaire (positions + normales), matériau
  `standard` éclairé, `Transform` non-identique, camera + lumière directionnelle, rotation dans `AppHandler::update`.
  Toujours via `AppBuilder`/scène automatique, **sans importer wgpu** (comme `simple`).
 - [ ] 5.2 **Migrer `simple.rs`** (quad plat → `standard` **unlit**, transform identité) et **`manual.rs`** (bas niveau
  → bind groups frame+object posés, unlit). `basic` disparaît comme famille séparée.
 - [ ] **Validation** : compile + tourne sans panique ; rotation/éclairage visibles (à confirmer sur GPU/fenêtre).
-**Fichier** : `lib/src/app.rs`.
+## Étape 6 — Validation globale & docs
-Ajouter sur `App` :
+- [ ] 6.1 `cargo check --workspace` 0 warning ; `cargo doc --no-deps` 0 warning ; `cargo fmt --all`.
-```rust
+- [ ] 6.2 Cas limites (comme à l'étape précédente) : scène vide, mesh non indexé, mesh 0-vertex.
-pub fn render_scene(&self, view: &wgpu::TextureView) {
+- [ ] 6.3 Mettre à jour `README.md` (statut 3D) + `docs/PLAN.md`/`docs/ROADMAP.md` (cases 1.3/1.5 actées).
-    self.renderer.render_scene(view, &self.scene);
+- [ ] 6.4 Commits conventionnels (`feat:`, `docs:`), diffs ciblés.
 }
 ```
 Le rendu automatique est branché par **défaut** dans le trait (**Option A, décidée**) :
 ```rust
 fn render(&mut self, app: &mut App, frame: &Frame) {
    app.render_scene(frame.view());
 }
 ```
 → `simple.rs` **n'implémente même pas `render`** : la scène se rend toute seule, exactement l'esprit
 « scene auto-render ». L'utilisateur avancé peut surcharger `render` pour contrôler le dessin.
-### Étape 3.4 — Remplir `simple.rs`
+---
-**Fichier** : `lib/examples/simple.rs`.
+## Décisions actées (verrouillées avant l'implémentation)
- Créer le quad (mêmes 4 sommets + 6 indices que dans `manual.rs`, mais sans toucher à wgpu : tout se fait
+| Décision | Option proposée | Justification |
-  via `Scene` + `AppBuilder`).
+|----------|-----------------|---------------|
- Enregistrer le shader : `app.cache.register_shader("basic", utils::BASIC_SHADER_PATH)`
+| Schéma uniforms | **Acté : 2 bind groups** — frame partagé (@0) + object par entité (@1) | Étendu, portable sur tous backends (Metal/DX12/Vulkan) ; `var<immediate>` neuf, limites de taille et hazard d'écriture par objet ; 2 binds/draw seulement, trivialement « pipeline bind-less » plus tard |
-  (le shader_id `"basic"` fonctionne déjà en fallback sur `BASIC_SHADER`, cf. `pipeline_cache.rs`).
+| Emplacement types uniforms | **Acté : `resources/uniform.rs`** (`FrameUniforms`, `ObjectUniform`, types `Pod` bytemuck) | Couche de données GPU (avec Camera/Mesh/Material/Vertex) ; préserve `math/` pur (sans bytemuck ni couplage wgpu) |
- Créer le matériau avec `Material::new(app.renderer.format(), "basic", &mut app.cache)`.
+| Cache object buffer | `RefCell<HashMap<label, (Buffer, BindGroup)>>` dans `Renderer` | `render_scene(&self)` immuable ; MVP petit nombre d'entités |
- Créer le mesh avec `Mesh::new(app.renderer.device(), &vertices, Some(&indices))`.
+| Transform dans l'entité | `Entity { mesh_id, material_id, transform }` + `add_entity_with_transform` | `add_entity` garde sa signature (transform identité) |
- Enregistrer dans `app.scene` : `add_mesh`, `add_material`, `add_entity`.
+| Layout pipeline | **Acté : un seul layout pour tous** (frame @0 + object @1) ; `basic` unlit = variante de `standard` | 2D = cas particulier 3D (décision utilisateur) ; supprime la fourchette à deux layouts pour toujours |
- Tout ce remplissage se fait dans `AppHandler::update()` (ou dans `run()` avant `app.run(...)` — à voir
+| Exemple démo | Nouvel exemple `cube.rs` (éclairé) ; `simple.rs` et `manual.rs` **migrés** vers le pipeline unifié (unlit) | Démontre le 3D sans dédoubler ; cohérent avec « un seul layout pour tous » |
-  selon où `app` est constructible ; le plus simple : dans `update(&mut self, app)` une fois).
+| Correction `basic_shader.wgsl` | **Supprimer** `basic` comme pipeline séparé ; le quad plat devient `standard` unlit | 2D ⊂ 3D : pas de famille de pipeline dédiée |
 > ⚠️ Les vertex passent par `Mesh::new(device, ...)` qui exige `wgpu::Device`. **Décision prise** : pour
 > l'étape 1, utiliser `app.renderer.device()`/`app.renderer.format()` (accès bibliothèque — l'utilisateur
 > n'importe pas wgpu). Un helper haut niveau `Scene::add_quad_entity` pourra être ajouté plus tard.
 ### Étape 3.5 — Validation
 ```bash
 cargo check --workspace
 cargo doc -p wsg-lib --no-deps      # exigence : "generated 0 warnings"
 cargo run -p wsg-lib --example simple   # le quad doit s'afficher
 cargo run -p wsg-lib --example manual   # le workflow manuel doit rester fonctionnel
 cargo fmt --all
 ```
 - Vérifier docs (`docs/DOCUMENTATION.md`) : zéro warning, backticks, chaque item public documenté.
 - Committer proprement (conventional commits, ex. `feat(app): expose frame view and auto-render scene`).
 ## 4. Décisions (actées)
 | Sujet | Décision |
 |-------|----------|
 | Signature de `render` | Ajouter `&Frame` en paramètre (Option A : default → auto-render) |
 | Où dessiner la scène | `Renderer::render_scene(view, &Scene)` en **batch** (1 pass unique) |
 | PipelineCache dans Scene | **Non bougé pour cette étape** : les `Material` portent déjà leur pipeline ; le lien conceptuel cache↔scene est reporté |
 | wgpu dans `simple.rs` | Via `app.renderer.device()`/`format()` : l'utilisateur n'importe pas wgpu |
 | Helper quad haut niveau | Reporté (éventuel `Scene::add_quad_entity`) |
 ## 5. Notes ouvertes / idées
 - Le "label" d'entité n'est pour l'instant pas utilisé au rendu (juste itéré). OK pour le MVP.
 - `num_indices == 0` dans le cas non indexé : bien gérer le branchement indexé/non indexé (copié depuis
  `Renderer::render` actuel).
 - Après cette étape, l'ajout de lumières/textures/caméras = simple ajout de données à la Scene
  (voir `docs/ROADMAP.md` Phases 2-4 et `docs/PLAN.md` Phase 4).
@@ -11,11 +11,11 @@ generated: { by: human:jerome, at: 2026-07-31T00:00:00Z }
 Ce plan définit les étapes prioritaires pour finaliser l'architecture actuelle. L'objectif est de rendre l'API intuitive pour l'utilisateur standard tout en conservant la puissance de contrôle pour l'utilisateur avancé.
-> **Statut réel (à jour au 2026-09-14).** Ce plan couvre la phase de *consolidation* passée ; la source
+> **Statut réel (à jour au 2026-09-16).** Ce plan couvre la phase de *consolidation* passée ; la source
-> de vérité sur l'état actuel est **README.md** et le code. Plusieurs cases `[X]` ci-dessous ont été
+> de vérité sur l'état actuel est **README.md** et le code. Depuis la révision du 2026-09-14, l'étape
-> re-corrigées car elles ne reflétaient plus la réalité : notamment le rendu de la `Scene` n'est
+> **« Scene auto-render »** a été réalisée : le rendu de la `Scene` est **automatisé** en une seule
-> **pas automatisé** (items Phase 2 et Check-list concernés). Depuis, `simple.rs` a été mis en
+> passe groupée via `App::render_scene(frame.view())` (appelée par défaut dans `AppHandler::render`),
-> conformité (API `AppBuilder`, ~15 lignes, compilation sans importer `winit`/`wgpu`).
+> et `simple.rs` (API `AppBuilder`, sans `winit`/`wgpu`) déclare un quad rendu automatiquement.
 ## Phase 1 : Finalisation et Nettoyage de l'Existant (Priorité Absolue)
@@ -45,8 +45,12 @@ Une fois la plomberie encapsulée, nous devons rendre l'assemblage des objets co
 ### Intégration de la Scene
 - [X] Formaliser la structure `Scene` : un conteneur qui liste les Entities.
- [ ] Associer le `PipelineCache` à la Scene pour que le rendu des matériaux soit automatique (actuellement le cache est porté par `App`, indépendant de la Scene ; le rendu n'est pas automatisé).
+- [ ] Associer le `PipelineCache` à la Scene pour que la gestion des matériaux soit entièrement portée par la scène (actuellement le cache est porté par `App`, indépendant de la Scene — le rendu de la scène est, lui, déjà automatisé depuis 2026-09-16).
- [ ] Implémenter la logique `app.render(scene)` : cette méthode doit parcourir la scène, récupérer les matériaux, gérer les pipelines via le cache, et soumettre les draw calls (non implémenté — cf. README, étape 1 du Roadmap : scene auto-rendering).
+- [X] Implémenter la logique de rendu de la scène : `App::render_scene(view)` parcourt la scène,
  récupère les matériaux et soumet tous les draw calls en **une seule passe groupée**
  (`Renderer::render_scene`), appelée automatiquement chaque frame par l'implémentation par défaut
  de `AppHandler::render` (Scene auto-render — réalisé 2026-09-16). Reste à brancher : associé au
  `PipelineCache` porté par la `Scene` (cf. ligne précédente).
 ### Gestion des Matériaux et Shaders
@@ -75,8 +79,26 @@ Une fois les phases 1 à 3 validées, nous pourrons introduire :
 ## Check-list de Vérification pour le LLM d'Assistance
 - [X] Est-ce que `simple.rs` compile sans importer `winit` ou `wgpu` ? (oui — modèle 15 lignes, API `AppBuilder`)
- [ ] Est-ce que `App::run` gère bien le cycle update → render → present ? (boucle + présentation OK, mais `render()` ne peut pas encore dessiner — vue de frame non exposée)
+- [X] Est-ce que `App::run` gère bien le cycle update → render → present ? (oui — la vue de frame est
  exposée via `Frame::view()`, `render()` dessine la scène automatiquement en une passe via
  `App::render_scene(frame.view())`, la présentation est faite par `App::run`)
 - [X] Les modules sont-ils bien exposés via `lib.rs` ?
- [X] `pollster` est-il uniquement en dev-dependencies ?
+- [X] `pollster` est-il uniquement en dev-dependencies ? — **obsolète** : depuis la migration
  winit 0.30 (2026-09-16), `pollster` est en `dependencies` de la lib (le `block_on` d'init GPU
  est désormais appelé dans le code de la lib, `app.rs`, cf. note pour mémoire ci-dessous).
-Ce plan garantit que les fondations sont saines. Une fois la Scene rendue automatiquement par `app.render()`, l'ajout de toute nouvelle fonctionnalité (lumières, textures) deviendra une simple question d'ajout de données dans la structure de scène, sans modification de la boucle de rendu.
+## Note pour mémoire : couplage au runtime async (pollster)
 Depuis la migration winit 0.30, la lib embarque un runtime async pour l'init GPU. Le point de
 couplage actuel est **unique** : `pollster::block_on(Context::new(...))` dans `lib/src/app.rs`
 (`resumed()`), plus le macro `#[pollster::main]` dans les exemples (crates séparées, hors lib).
 À ce stade (un seul appel), **on ne crée volontairement PAS d'abstraction** : ce serait du
 sur-engineering pour un seul point d'appel. Mais si la lib acquiert d'autres appels async
 (chargements / uploads GPU, etc.), il faudra isoler le runtime derrière un **module-pivot unique**
 (`lib/src/exec.rs`, une fonction `block_on`), seul fichier à modifier pour basculer de pollster
 vers tokio/futures-executor — le reste du code appelant `crate::exec::block_on(...)`.
 Rappel : pollster et tokio sont des runtimes indépendants qui coexistent sans conflit dans un
 même binaire ; la seule contre-indication est de faire un `pollster::block_on` **à l'intérieur**
 d'un contexte async tokio (blocage imbriqué / deadlock possible).
@@ -12,14 +12,25 @@ generated: { by: human:jerome, at: 2026-07-31T00:00:00Z }
 > Basé sur l'architecture existante (ARCHI_APP, ARCHI_ARENES, ARCHI_CPU_GPU, ARCHI_RENDU).
 > Objectif : prototype fonctionnel d'abord, enrichissement progressif ensuite.
 >
-> **Point de départ (état réel au 2026-09-14 — la source de vérité est README.md).**
+> **Point de départ (état réel au 2026-09-16 — la source de vérité est README.md).**
 > Les fondations suivantes existent et fonctionnent déjà ; cette roadmap décrit la **trajectoire à
 > venir** à partir de cet état (elle reprend les étapes 1-4 du README avant la montée GPU-driven) :
 > - Workflow manuel (`Context` + `Renderer` + `PipelineCache`) : ✅ fonctionnel (exemple `manual`).
-> - Façade `App` / `AppBuilder` / `AppHandler` : 🚧 scaffold — boucle et présentation OK, mais `render()` ne peut pas encore dessiner (vue de frame non exposée) et le rendu de la scène n'est pas automatisé.
+> - Façade `App` / `AppBuilder` / `AppHandler` : ✅ **Scene auto-render** (2026-09-16) — la vue de frame
 >   est exposée (`Frame::view()`), `render()` dessine la scène en une passe groupée
 >   (`App::render_scene`) et la présentation est automatique dans `App::run` (exemple `simple`).
 > - `Scene` avec identifiants **String** (décision prise — voir tableau Notes de Décision) : 🚧 enregistrement seul.
 > - `Camera` / `Transform` et `glam` : types et mathématiques présents (`math/`, `resources/camera.rs`), non branchés au pipeline.
 > **Étape suivante (prochaine itération) — « 3D + éclairage Phong » (ROADMAP 1.3 + 1.5).**
 > Le rendu automatique est aujourd'hui **plat** : le `basic_shader.wgsl` interprète les positions comme
 > déjà en NDC, sans matrice monde/vue/projection ni lumière. L'étape suivante rend la scène réellement
 > 3D et éclairée : créer `standard_shader.wgsl` (Phong : matrice `projection * view * world` + lumière
 > directionnelle), ajouter les uniform buffers (frame : view/proj/light ; par mesh : world matrix dérivée
 > du `Transform`) et les brancher dans `Renderer::render_scene` et `Material`, puis exposer `Camera`/
 > `Transform` à la `Scene` (caméra active) et ajouter un mesh de test (cube) à l'exemple. Objectif MVP :
 > **un mesh 3D éclairé à l'écran**.
 ---
 ## Phase 1️⃣ — Prototype MVP : Un Mesh 3D éclairé à l'écran
@@ -72,6 +72,13 @@ pub trait AppHandler {
 - **`update()`** : appelé en premier. L'utilisateur peut modifier librement la scène (transformations, ajout/suppression d'entités). Ces modifications sont synchronisées vers le GPU via un **single buffer** Transform avant la passe de calcul.
 - **`render()`** : appelé après. Il ne sert qu'à injecter du rendu personnalisé (debug, HUD, etc.). La Scene reste immuable : aucune mutation d'état métier.
 > **Note pour mémoire (init GPU / runtime async)** : depuis la migration winit 0.30, l'init GPU
 > se fait dans le callback synchrone `resumed()`, donc via `pollster::block_on(Context::new(...))`
 > dans `app.rs`. C'est actuellement le **seul** point de couplage de la lib à un runtime async.
 > On ne crée volontairement pas d'abstraction tant qu'il n'y a qu'un appel ; si la lib acquiert
 > d'autres appels async, isoler le runtime derrière un module-pivot unique (`exec::block_on`),
 > seul fichier à modifier pour basculer vers tokio/futures-executor. Voir PLAN.md (note pour mémoire).
 ## 4. Workflow et Cycle de Vie
 ### A. Initialisation (Configuration)
@@ -8,10 +8,8 @@ path = "src/lib.rs"
 [dependencies]
 wgpu = "30.0.0" # Vérifiez la version la plus récente
-winit = "0.29"  # For window management — pinned to match examples
+winit = "0.30.13"  # For window management — pinned to match examples
 thiserror = "2"
 bytemuck = { version = "1.25.0", features = ["derive"] }
 glam = "0.33"
-
+pollster = { version="1.0.1", features = ["macro"] }
 [dev-dependencies]
 pollster = { version="0.4.0", features = ["macro"] }
@@ -1,6 +1,13 @@
 //! Workflow bas-niveau : utilisation directe du `Context`, `Renderer`, `PipelineCache`, `Mesh` et
 //! `Material`, contournant la façade `App`. Rendu d'un quad plat éclairé via la boucle winit 0.30
 //! (`EventLoop::run_app` + `ApplicationHandler`). La fenêtre et le GPU sont créés dans `resumed()`,
 //! comme l'exigent winit 0.30 et la migration faite dans `app.rs`.
 use std::sync::Arc;
-use winit::event_loop::EventLoop;
+use winit::application::ApplicationHandler;
-use winit::window::WindowBuilder;
+use winit::dpi::LogicalSize;
 use winit::event::WindowEvent;
 use winit::event_loop::{ActiveEventLoop, ControlFlow, EventLoop};
 use winit::window::{Window, WindowAttributes};
 use wsg_lib::core::Context;
 use wsg_lib::core::Frame;
 use wsg_lib::core::Renderer;
@@ -10,92 +17,144 @@ use wsg_lib::resources::Mesh;
 use wsg_lib::resources::Vertex;
 use wsg_lib::utils;
 /// Application bas-niveau : détient les objets GPU + window, tous créés dans `resumed`.
 struct App {
    /// Fenêtre système, partagée via Arc (comme dans app.rs).
    window: Option<Arc<Window>>,
    /// Contexte GPU (Instance, Surface, Adapter, Device, Queue).
    context: Option<Context>,
    /// Couche d'exécution qui soumet les draw calls.
    renderer: Option<Renderer>,
    /// Cache de shaders/pipelines.
    cache: Option<PipelineCache>,
    /// Matériau (pipeline) du quad.
    material: Option<Material>,
    /// Mesh du quad (sommets + indices).
    mesh: Option<Mesh>,
 }
 impl ApplicationHandler for App {
    /// Crée la fenêtre puis le GPU, et construit le mesh/matériau. Exécuté une fois au démarrage.
    /// Redondant `resumed` pour créer à nouveau ? double protection par `self.context.is_some()`.
    fn resumed(&mut self, event_loop: &ActiveEventLoop) {
        if self.context.is_some() {
            return;
        }
        event_loop.set_control_flow(ControlFlow::Poll);
        let attrs = WindowAttributes::default()
            .with_title("WSG Manual")
            .with_inner_size(LogicalSize::new(800.0, 600.0));
        let window = Arc::new(event_loop.create_window(attrs).unwrap());
        // 1. Initialisation
        let context = pollster::block_on(Context::new(window.clone())).expect("Échec init GPU");
        // Configuration de la surface et récupération du format
        let format = context
            .configure(&context.adapter, 800, 600)
            .expect("Échec configuration");
        // 2. Initialisation du Renderer (Il récupère tout ce dont il a besoin)
        let device = Arc::new(context.device.clone());
        let mut cache = PipelineCache::new(device);
        cache
            .register_shader("basic", utils::BASIC_SHADER_PATH)
            .unwrap();
        let renderer = Renderer::new(&context, format);
        // 3. Material : On utilise renderer.device() et renderer.format()
        let material = Material::new(renderer.format(), "basic", &mut cache);
        // Mesh : On utilise le device du renderer
        let vertices = [
            // Position (x,y,z) | Normale (x,y,z) | UV (u,v) | Couleur (r,g,b,a)
            Vertex {
                position: [-0.5, 0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [0.0, 0.0],
                color: [1.0, 0.0, 0.0, 1.0],
            }, // Haut-Gauche (Rouge)
            Vertex {
                position: [0.5, 0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [1.0, 0.0],
                color: [0.0, 1.0, 0.0, 1.0],
            }, // Haut-Droite (Vert)
            Vertex {
                position: [0.5, -0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [1.0, 1.0],
                color: [0.0, 0.0, 1.0, 1.0],
            }, // Bas-Droite (Bleu)
            Vertex {
                position: [-0.5, -0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [0.0, 1.0],
                color: [1.0, 1.0, 0.0, 1.0],
            }, // Bas-Gauche (Jaune)
        ];
        let indices: [u16; 6] = [0, 1, 2, 0, 2, 3];
        let mesh = Mesh::new(renderer.device(), &vertices, Some(&indices));
        self.window = Some(window);
        self.context = Some(context);
        self.renderer = Some(renderer);
        self.cache = Some(cache);
        self.material = Some(material);
        self.mesh = Some(mesh);
    }
    /// À chaque frame, demande un redessin pour un rendu continu (animation).
    fn about_to_wait(&mut self, _event_loop: &ActiveEventLoop) {
        if let Some(window) = &self.window {
            window.request_redraw();
        }
    }
    /// Dispatch des événements de fenêtre : RedrawRequested rend puis présente, CloseRequested quitte.
    fn window_event(
        &mut self,
        event_loop: &ActiveEventLoop,
        _window_id: winit::window::WindowId,
        event: WindowEvent,
    ) {
        match event {
            winit::event::WindowEvent::RedrawRequested => {
                if let (Some(context), Some(renderer), Some(mesh), Some(material)) =
                    (&self.context, &self.renderer, &self.mesh, &self.material)
                {
                    if let Some(frame) = Frame::try_new(&context.surface) {
                        // 1. Rendu (plus d'arguments device/queue inutiles)
                        renderer.render(frame.view(), mesh, material);
                        // 2. Présentation
                        renderer.present(frame);
                    }
                }
            }
            winit::event::WindowEvent::CloseRequested => {
                event_loop.exit(); // C'est ici que tu demandes à la boucle de s'arrêter
            }
            _ => (),
        }
    }
 }
 fn main() {
    println!(
        "Répertoire courant : {:?}",
        std::env::current_dir().unwrap()
    );
    let event_loop = EventLoop::new().unwrap();
-    let window = Arc::new(WindowBuilder::new().build(&event_loop).unwrap());
+    let mut app = App {
-
+        window: None,
-    // 1. Initialisation
+        context: None,
-    let context = pollster::block_on(Context::new(window.clone())).expect("Échec init GPU");
+        renderer: None,
-
+        cache: None,
-    // Configuration de la surface et récupération du format
+        material: None,
-    let format = context
+        mesh: None,
-        .configure(&context.adapter, 800, 600)
+    };
-        .expect("Échec configuration");
+    event_loop.run_app(&mut app).unwrap();
    // 2. Initialisation du Renderer (Il récupère tout ce dont il a besoin)
    let device = Arc::new(context.device.clone());
    let mut cache = PipelineCache::new(device);
    cache
        .register_shader("basic", utils::BASIC_SHADER_PATH)
        .unwrap();
    let renderer = Renderer::new(&context, format);
    // 3. Material : On utilise renderer.device() et renderer.format()
    let material = Material::new(renderer.format(), "basic", &mut cache);
    // Mesh : On utilise le device du renderer
    let vertices = [
        // Position (x,y,z) | Normale (x,y,z) | UV (u,v) | Couleur (r,g,b,a)
        Vertex {
            position: [-0.5, 0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [0.0, 0.0],
            color: [1.0, 0.0, 0.0, 1.0],
        }, // Haut-Gauche (Rouge)
        Vertex {
            position: [0.5, 0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [1.0, 0.0],
            color: [0.0, 1.0, 0.0, 1.0],
        }, // Haut-Droite (Vert)
        Vertex {
            position: [0.5, -0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [1.0, 1.0],
            color: [0.0, 0.0, 1.0, 1.0],
        }, // Bas-Droite (Bleu)
        Vertex {
            position: [-0.5, -0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [0.0, 1.0],
            color: [1.0, 1.0, 0.0, 1.0],
        }, // Bas-Gauche (Jaune)
    ];
    let indices: [u16; 6] = [0, 1, 2, 0, 2, 3];
    let mesh = Mesh::new(renderer.device(), &vertices, Some(&indices));
    // Render loop
    event_loop
        .run(|event, elwt| {
            match event {
                winit::event::Event::AboutToWait => {
                    window.request_redraw();
                }
                winit::event::Event::WindowEvent {
                    event: winit::event::WindowEvent::RedrawRequested,
                    ..
                } => {
                    if let Some(frame) = Frame::try_new(&context.surface) {
                        // 1. Rendu (plus d'arguments device/queue inutiles)
                        renderer.render(frame.view(), &mesh, &material);
                        // 2. Présentation
                        renderer.present(frame);
                    }
                }
                winit::event::Event::WindowEvent {
                    event: winit::event::WindowEvent::CloseRequested,
                    ..
                } => {
                    elwt.exit(); // C'est ici que tu demandes à la boucle de s'arrêter
                }
                _ => (),
            }
        })
        .unwrap();
 }
@@ -1,8 +1,9 @@
 //! Workflow déclaratif minimal, sans manipulation WGPU explicite dans ce fichier.
-//! `AppBuilder` ouvre la fenêtre, construit le `Context`/`Renderer` et fait tourner la boucle
+//! `AppBuilder` crée l'event loop puis `App::run` ouvre la fenêtre, construit le `Context`/`Renderer`
-//! update → render → present. La scène se rend automatiquement : la méthode `render()` par défaut
+//! et fait tourner la boucle update → render → present. Depuis la migration winit 0.30, le GPU n'existe
-//! du trait `AppHandler` appelle `app.render_scene(frame.view())`, donc l'utilisateur n'implémente
+//! qu'après `resumed` : c'est pourquoi l'enregistrement shader + la création mesh/matériau/entité vivent
-//! même pas `render` ici — il ne fait que remplir `app.scene` avec un mesh, un matériau et une entité.
+//! dans le hook `AppHandler::setup`, appelé une fois le contexte prêt. La scène se rend automatiquement :
 //! la méthode `render()` par défaut appelle `app.render_scene(frame.view())`.
 use std::sync::Arc;
 use wsg_lib::AppHandler;
 use wsg_lib::app::AppBuilder;
@@ -11,56 +12,59 @@ use wsg_lib::utils::WsgError;
 struct MonQuad;
-impl AppHandler for MonQuad {}
+impl AppHandler for MonQuad {
    fn setup(&mut self, app: &mut wsg_lib::App) {
        let format = app.renderer().format();
        // Enregistrement du shader, création du matériau et du mesh du quad (sans importer wgpu).
        app.cache()
            .register_shader("basic", wsg_lib::utils::BASIC_SHADER_PATH)
            .unwrap();
        let vertices = [
            Vertex {
                position: [-0.5, 0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [0.0, 0.0],
                color: [1.0, 0.0, 0.0, 1.0],
            }, // Haut-Gauche (Rouge)
            Vertex {
                position: [0.5, 0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [1.0, 0.0],
                color: [0.0, 1.0, 0.0, 1.0],
            }, // Haut-Droite (Vert)
            Vertex {
                position: [0.5, -0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [1.0, 1.0],
                color: [0.0, 0.0, 1.0, 1.0],
            }, // Bas-Droite (Bleu)
            Vertex {
                position: [-0.5, -0.5, 0.0],
                normal: [0.0, 0.0, 1.0],
                uv: [0.0, 1.0],
                color: [1.0, 1.0, 0.0, 1.0],
            }, // Bas-Gauche (Jaune)
        ];
        let indices: [u16; 6] = [0, 1, 2, 0, 2, 3];
        let mesh = Arc::new(Mesh::new(
            app.renderer().device(),
            &vertices,
            Some(&indices),
        ));
        let material = Arc::new(Material::new(format, "basic", app.cache()));
        app.scene.add_mesh("quad_mesh", mesh).unwrap();
        app.scene.add_material("basic_material", material).unwrap();
        app.scene
            .add_entity("quad", "quad_mesh", "basic_material")
            .unwrap();
    }
 }
 #[pollster::main]
 async fn main() -> Result<(), WsgError> {
-    let mut app = AppBuilder::new().title("WSG Simple").build().await?;
+    let app = AppBuilder::new().title("WSG Simple").build().await?;
    // Enregistrement du shader, création du matériau et du mesh du quad (sans importer wgpu).
    app.cache
        .register_shader("basic", wsg_lib::utils::BASIC_SHADER_PATH)
        .unwrap();
    let vertices = [
        Vertex {
            position: [-0.5, 0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [0.0, 0.0],
            color: [1.0, 0.0, 0.0, 1.0],
        }, // Haut-Gauche (Rouge)
        Vertex {
            position: [0.5, 0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [1.0, 0.0],
            color: [0.0, 1.0, 0.0, 1.0],
        }, // Haut-Droite (Vert)
        Vertex {
            position: [0.5, -0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [1.0, 1.0],
            color: [0.0, 0.0, 1.0, 1.0],
        }, // Bas-Droite (Bleu)
        Vertex {
            position: [-0.5, -0.5, 0.0],
            normal: [0.0, 0.0, 1.0],
            uv: [0.0, 1.0],
            color: [1.0, 1.0, 0.0, 1.0],
        }, // Bas-Gauche (Jaune)
    ];
    let indices: [u16; 6] = [0, 1, 2, 0, 2, 3];
    let mesh = Arc::new(Mesh::new(app.renderer.device(), &vertices, Some(&indices)));
    let material = Arc::new(Material::new(
        app.renderer.format(),
        "basic",
        &mut app.cache,
    ));
    app.scene.add_mesh("quad_mesh", mesh).unwrap();
    app.scene.add_material("basic_material", material).unwrap();
    app.scene
        .add_entity("quad", "quad_mesh", "basic_material")
        .unwrap();
    app.run(MonQuad)
 }
@@ -12,6 +12,14 @@
 //! - **scene::scene**: Exposes Scene as mutable field so users can register resources and entities.
 //! - **utils::conf**: Provides default window title, dimensions, and embedded WGSL source.
 //! - **handler**: Defines the AppHandler trait that users implement for custom logic.
 //!
 //! ## Architecture Note (winit 0.30)
 //! winit 0.30 removed the synchronous window-creation API (`WindowBuilder`) and the closure-based
 //! `EventLoop::run`, replacing them with the [`ApplicationHandler`] model driven by `EventLoop::run_app`.
 //! Windows can only be created inside `ApplicationHandler::resumed()`. Consequently this module builds
 //! the window and GPU context lazily inside `AppRunner`'s `resumed()` callback, and exposes the
 //! user-facing `AppBuilder::build → App::run` flow over that model. `AppHandler::setup()` is invoked
 //! once right after GPU initialization so users can register shaders/meshes/materials/entities.
 use crate::AppHandler;
 use crate::core::{Context, Renderer};
@@ -20,68 +28,96 @@ use crate::scene::Scene;
 use crate::utils::WsgError;
 use crate::utils::conf::{APP_DEFAULT_HEIGHT, APP_DEFAULT_TITLE, APP_DEFAULT_WIDTH};
 use std::sync::Arc;
-use winit::event_loop::EventLoop;
+use winit::application::ApplicationHandler;
-use winit::window::Window;
+use winit::dpi::LogicalSize;
 use winit::event::WindowEvent;
 use winit::event_loop::{ActiveEventLoop, ControlFlow, EventLoop};
 use winit::window::{Window, WindowAttributes};
 /// High-level application facade that orchestrates window lifecycle, event loop, and rendering automation.
 /// Encapsulates all five WGPU objects (Instance, Surface, Adapter, Device, Queue) plus the render loop.
 /// Users create an App via AppBuilder, then run it with their implementation of AppHandler.
 ///
 /// The GPU-facing fields (`context`, `renderer`, `window`, `cache`) are created lazily when the
 /// application is resumed (see `AppRunner`); they are only populated after `App::run` has started.
 /// Access them through the `context()`, `renderer()`, `window()` and `cache()` accessors, which is
 /// guaranteed to work inside `AppHandler::setup`, `update` and `render`.
 pub struct App {
-    /// GPU hardware context — owns Instance, Surface, Adapter, Device, Queue lifecycle.
+    /// Resource depot and entity graph — users register Meshes/Materials here during `AppHandler::setup`.
    pub context: Context,
    /// Executor layer — binds Materials and Meshes into RenderPasses during draw calls.
    pub renderer: Renderer,
    /// Winit event loop for window management. Set to None after run() consumes it.
    pub event_loop: Option<EventLoop<()>>, // On met en Option pour pouvoir faire .take() facilement
    /// Shader compilation cache — manages RenderPipelines keyed by shader_id.
    pub cache: PipelineCache,
    /// Resource depot and entity graph — users register Meshes/Materials here before the render loop begins.
    pub scene: Scene,
    /// Window title, read by the runner when the window is created in `resumed`.
    pub(crate) title: String,
    /// Window width, read by the runner when the window is created in `resumed`.
    pub(crate) width: u32,
    /// Window height, read by the runner when the window is created in `resumed`.
    pub(crate) height: u32,
    /// Winit event loop for window management. Set to None after run() consumes it.
    event_loop: Option<EventLoop<()>>, // On met en Option pour pouvoir faire .take() facilement
    /// GPU hardware context — owns Instance, Surface, Adapter, Device, Queue lifecycle.
    context: Option<Context>,
    /// Executor layer — binds Materials and Meshes into RenderPasses during draw calls.
    renderer: Option<Renderer>,
    /// The OS-level window backing this application. Shared via Arc for multi-owner access.
-    pub window: Arc<Window>,
+    window: Option<Arc<Window>>,
    /// Shader compilation cache — manages RenderPipelines keyed by shader_id.
    cache: Option<PipelineCache>,
 }
 impl App {
    /// Returns a reference to the GPU renderer.
    /// Panics if called before `App::run` has created the renderer (i.e. before `resumed` fires).
    pub fn renderer(&self) -> &Renderer {
        self.renderer
            .as_ref()
            .expect("renderer not initialized yet — call app.run(handler) first")
    }
    /// Returns a reference to the GPU hardware context.
    /// Panics if called before `App::run` has created the context (i.e. before `resumed` fires).
    pub fn context(&self) -> &Context {
        self.context
            .as_ref()
            .expect("context not initialized yet — call app.run(handler) first")
    }
    /// Returns a mutable reference to the shader compilation cache.
    /// Panics if called before `App::run` has created the cache (i.e. before `resumed` fires).
    pub fn cache(&mut self) -> &mut PipelineCache {
        self.cache
            .as_mut()
            .expect("cache not initialized yet — call app.run(handler) first")
    }
    /// Returns a reference to the window backing this application.
    /// Panics if called before `App::run` has created the window (i.e. before `resumed` fires).
    pub fn window(&self) -> &Window {
        self.window
            .as_ref()
            .expect("window not initialized yet — call app.run(handler) first")
            .as_ref()
    }
    /// Runs the application's main loop: processes events, updates logic per frame, renders, and presents.
    /// Inputs: handler — user-provided AppHandler implementation containing game logic.
    /// Returns Ok(()) on success or Err(WsgError::WindowSystem) if the event loop exits abnormally.
    /// Called once at application entry point; runs until the window is closed or an error occurs.
-    /// Internal steps: 1) take EventLoop from Option → 2) enter winit event loop →
+    /// Internal steps: 1) take EventLoop from Option → 2) build an `AppRunner` around the handler →
-    ///   3a) on AboutToWait: call handler.update() + request_redraw →
+    ///   3) on resumed: create window/context/renderer/cache and call handler.setup() →
-    ///       3b) on RedrawRequested: acquire frame → call handler.render() → present frame →
+    ///   4) on about_to_wait: call handler.update() + request_redraw →
-    ///       3c) on CloseRequested: exit event loop.
+    ///   5) on RedrawRequested: acquire frame → call handler.render() → present frame →
-    pub fn run<H: AppHandler + 'static>(mut self, mut handler: H) -> Result<(), WsgError> {
+    ///   6) on CloseRequested: exit the event loop.
    pub fn run<H: AppHandler + 'static>(mut self, handler: H) -> Result<(), WsgError> {
        // On extrait l'event_loop de manière sûre grâce au Option
        let event_loop = self.event_loop.take().ok_or(WsgError::WindowSystem)?; // Erreur si déjà pris
        let mut runner = AppRunner {
            title: self.title.clone(),
            width: self.width,
            height: self.height,
            handler,
            app: None,
        };
        event_loop
-            .run(move |event, elwt| {
+            .run_app(&mut runner)
                match event {
                    winit::event::Event::AboutToWait => {
                        // update logic
                        handler.update(&mut self);
                        self.window.request_redraw();
                    }
                    winit::event::Event::WindowEvent {
                        event: winit::event::WindowEvent::RedrawRequested,
                        ..
                    } => {
                        // Rendering logic
                        let frame = self.context.get_next_frame();
                        // On appelle le render() de l'utilisateur (reçoit la frame courante)
                        handler.render(&mut self, &frame);
                        // On présente automatiquement
                        self.renderer.present(frame);
                    }
                    winit::event::Event::WindowEvent {
                        event: winit::event::WindowEvent::CloseRequested,
                        ..
                    } => {
                        elwt.exit();
                    }
                    _ => {}
                }
            })
            .map_err(|_| WsgError::WindowSystem)
    }
@@ -90,7 +126,7 @@ impl App {
    /// who override `render` to control drawing themselves.
    /// Inputs: view — the frame's texture view acting as the color attachment target.
    pub fn render_scene(&self, view: &wgpu::TextureView) {
-        self.renderer.render_scene(view, &self.scene);
+        self.renderer().render_scene(view, &self.scene);
    }
 }
@@ -128,34 +164,123 @@ impl AppBuilder {
        self.height = height;
        self
    }
-    /// Builds the configured `App` instance by creating all required components in order:
+    /// Builds the configured `App` instance: creates the event loop and stores the window
-    /// EventLoop → Window → Context → Renderer → PipelineCache → Scene.
+    /// configuration. The GPU context, window and renderer are created later, when the event loop
-    /// Returns Ok(App) on success or Err(WsgError) if any component fails during creation.
+    /// is resumed (inside `App::run`), because winit 0.30 only allows window creation in that phase.
-    /// Called after setting desired properties via the builder pattern; triggers async GPU initialization.
+    /// Returns Ok(App) on success or Err(WsgError) if the event loop cannot be created.
    /// Called after setting desired properties via the builder pattern before `App::run`.
    pub async fn build(self) -> Result<App, WsgError> {
-        let event_loop = EventLoop::new().unwrap();
+        let event_loop = EventLoop::new().map_err(|_| WsgError::WindowSystem)?;
        let window = Arc::new(
            winit::window::WindowBuilder::new()
                .with_title(&self.title)
                .build(&event_loop)
                .map_err(|_| WsgError::WindowSystem)?,
        );
        let context = Context::new(window.clone()).await?;
        let device = Arc::new(context.device.clone());
        let format = context
            .configure(&context.adapter, self.width, self.height)
            .map_err(|_| WsgError::SurfaceIncompatible)?;
        let renderer = Renderer::new(&context, format);
        let cache = PipelineCache::new(device);
        let scene = Scene::new();
        Ok(App {
-            context,
+            scene: Scene::new(),
-            renderer,
+            title: self.title,
-            cache,
+            width: self.width,
-            scene,
+            height: self.height,
            event_loop: Some(event_loop),
-            window,
+            context: None,
            renderer: None,
            window: None,
            cache: None,
        })
    }
 }
 /// Internal runner that adapts a user `AppHandler` to winit's 0.30 `ApplicationHandler` model.
 /// It owns the window/GPU lifecycle: everything is created lazily inside `resumed()`, then the
 /// user's `setup`, `update` and `render` hooks are driven from the corresponding winit events.
 struct AppRunner<H: AppHandler> {
    /// Window title, applied when the window is created in `resumed`.
    title: String,
    /// Window width in pixels, applied when the window is created in `resumed`.
    width: u32,
    /// Window height in pixels, applied when the window is created in `resumed`.
    height: u32,
    /// The user-provided game logic.
    handler: H,
    /// The fully-built App facade, populated on the first `resumed` event.
    app: Option<App>,
 }
 impl<H: AppHandler> ApplicationHandler for AppRunner<H> {
    /// Builds the window, GPU context, renderer and shader cache, then invokes the user's `setup`.
    /// Guarded so redundant back-to-back `resumed` events do not re-initialize the GPU.
    /// Inputs: event_loop — the active event loop used to create the window and control redrawing.
    fn resumed(&mut self, event_loop: &ActiveEventLoop) {
        if self.app.is_some() {
            return;
        }
        event_loop.set_control_flow(ControlFlow::Poll);
        let attrs = WindowAttributes::default()
            .with_title(&self.title)
            .with_inner_size(LogicalSize::new(self.width as f64, self.height as f64));
        let window = Arc::new(
            event_loop
                .create_window(attrs)
                .map_err(|_| WsgError::WindowSystem)
                .expect("failed to create window"),
        );
        // Initialization GPU (bloquant, simplifié au max)
        let context = pollster::block_on(Context::new(window.clone())).expect("Échec init GPU");
        let format = context
            .configure(&context.adapter, self.width, self.height)
            .expect("Échec configuration surface");
        let device = Arc::new(context.device.clone());
        let cache = PipelineCache::new(device);
        let renderer = Renderer::new(&context, format);
        let mut app = App {
            scene: Scene::new(),
            title: self.title.clone(),
            width: self.width,
            height: self.height,
            event_loop: None,
            context: Some(context),
            renderer: Some(renderer),
            window: Some(window),
            cache: Some(cache),
        };
        // On laisse l'utilisateur enregistrer shaders/meshes/matériaux/entités une fois le GPU prêt.
        self.handler.setup(&mut app);
        self.app = Some(app);
    }
    /// Drives the user's per-frame update and requests a redraw so the window renders continuously.
    /// Inputs: _event_loop — active event loop (unused here).
    fn about_to_wait(&mut self, _event_loop: &ActiveEventLoop) {
        let Some(app) = self.app.as_mut() else {
            return;
        };
        self.handler.update(app);
        app.window().request_redraw();
    }
    /// Dispatches window events: RedrawRequested renders/presents a frame, CloseRequested exits.
    /// Inputs: event_loop — active event loop, used to exit on close; event — the window event.
    fn window_event(
        &mut self,
        event_loop: &ActiveEventLoop,
        _window_id: winit::window::WindowId,
        event: WindowEvent,
    ) {
        let Some(app) = self.app.as_mut() else {
            return;
        };
        match event {
            WindowEvent::RedrawRequested => {
                // Rendering logic
                let frame = app.context().get_next_frame();
                // On appelle le render() de l'utilisateur (reçoit la frame courante)
                self.handler.render(app, &frame);
                // On présente automatiquement
                app.renderer().present(frame);
            }
            WindowEvent::CloseRequested => {
                event_loop.exit();
            }
            _ => {}
        }
    }
 }
@@ -113,7 +113,7 @@ impl Renderer {
                ..Default::default()
            });
-            for (_label, mesh, material) in scene.iter_entities() {
+            for (_label, mesh, material, _transform) in scene.iter_entities() {
                draw_entity(&mut render_pass, mesh, material);
            }
        }
@@ -24,6 +24,12 @@ use crate::core::Frame;
 /// render (draw call execution). Default implementations provide empty update and automatic
 /// scene rendering for convenience.
 pub trait AppHandler {
    /// Called once by `App::run`, right after the window/GPU context are created (winit `resumed`).
    /// Use it to register shaders, build Meshes/Materials, and populate `app.scene` before the loop
    /// starts. This replaces the pre-`run` setup that was possible before the winit 0.30 migration.
    /// Default implementation does nothing.
    /// Inputs: app — mutable reference to the fully-initialized App facade.
    fn setup(&mut self, _app: &mut App) {}
    /// Called once per frame before rendering begins. Used for physics updates, input processing,
    /// entity management, and any other pre-render logic. Default implementation does nothing.
    /// Inputs: _app — mutable reference to the App facade providing access to all subsystems.
@@ -13,7 +13,7 @@
 //! - `view_matrix()`: Computes the view matrix
 //! - `projection_matrix()`: Computes the projection matrix
-use glam::{Vec3, Mat4};
+use glam::{Mat4, Vec3};
 /// Represents a 3D camera for viewing the scene.
 ///
@@ -31,7 +31,11 @@ pub struct Camera {
 impl Camera {
    /// Creates a new camera with specified position, target, and up vector.
    pub fn new(position: Vec3, target: Vec3, up: Vec3) -> Self {
-        Self { position, target, up }
+        Self {
            position,
            target,
            up,
        }
    }
    /// Computes the view matrix for this camera.
@@ -39,7 +43,7 @@ impl Camera {
    /// # Returns
    /// A `Mat4` representing the view transformation matrix
    pub fn view_matrix(&self) -> Mat4 {
-        Mat4::look_at_rh(self.position, self.target, self.up)
+        glam::camera::rh::view::look_at_mat4(self.position, self.target, self.up)
    }
    /// Computes the projection matrix for this camera.
@@ -53,6 +57,6 @@ impl Camera {
    /// # Returns
    /// A `Mat4` representing the projection transformation matrix
    pub fn projection_matrix(&self, fov: f32, aspect: f32, near: f32, far: f32) -> Mat4 {
-        Mat4::perspective_rh_gl(fov, aspect, near, far)
+        glam::camera::rh::proj::opengl::perspective(fov, aspect, near, far)
    }
-}
+}
@@ -10,11 +10,13 @@
 //! - `mesh::new()` uploads Vertex arrays from CPU memory into GPU vertex buffers via DeviceExt::create_buffer_init().
 //! - `material::new()` requests RenderPipelines from PipelineCache during scene initialization.
 pub mod camera;
 pub mod material;
 pub mod mesh;
 pub mod vertex;
 // Re-exports
 pub use camera::Camera;
 pub use material::Material;
 pub use mesh::Mesh;
 pub use vertex::Vertex;
@@ -0,0 +1,64 @@
 //! # Entity Module
 //!
 //! Defines `Entity`, the renderable association between a Mesh and a Material together with its
 //! own world-space `Transform`. Each entry of `Scene::entities` is an `Entity`: it references the
 //! resource by identifier while carrying the per-entity placement data.
 //!
 //! ## Interaction with Other Modules
 //! - `scene::Scene` stores entities in a `HashMap<String, Entity>` keyed by label.
 //! - `math::Transform` provides the placement (translation / rotation / scale) converted to a
 //!   matrix during rendering.
 //! - `resources::{Mesh, Material}` are the referenced render resources, resolved by `Scene`.
 use crate::math::Transform;
 /// A renderable entity: a mesh + material pair with its own world-space transform.
 ///
 /// Entities are created through [`crate::scene::Scene::add_entity`] (identity transform) or
 /// [`crate::scene::Scene::add_entity_with_transform`]. Fields are exposed via accessors.
 #[derive(Debug, Clone)]
 pub struct Entity {
    /// Identifier of the referenced Mesh resource.
    mesh_id: String,
    /// Identifier of the referenced Material resource.
    material_id: String,
    /// World-space placement of this entity.
    transform: Transform,
 }
 impl Entity {
    /// Creates a new entity associating a mesh and a material under the given transform.
    /// Called internally by `Scene::add_entity*` after resource existence is validated.
    pub fn new(
        mesh_id: impl Into<String>,
        material_id: impl Into<String>,
        transform: Transform,
    ) -> Self {
        Self {
            mesh_id: mesh_id.into(),
            material_id: material_id.into(),
            transform,
        }
    }
    /// Returns the identifier of the referenced Mesh resource.
    pub fn mesh_id(&self) -> &str {
        &self.mesh_id
    }
    /// Returns the identifier of the referenced Material resource.
    pub fn material_id(&self) -> &str {
        &self.material_id
    }
    /// Returns a reference to this entity's world-space transform.
    pub fn transform(&self) -> &Transform {
        &self.transform
    }
    /// Sets this entity's world-space transform.
    /// Called by `Scene::set_entity_transform` during dynamic updates.
    pub fn set_transform(&mut self, transform: Transform) {
        self.transform = transform;
    }
 }
@@ -16,7 +16,9 @@
 //! all resources are declared before the render loop begins, while keeping the freedom to build the engine
 //! "brick by brick" through direct Context/PipelineCache/Renderer manipulation.
 pub mod entity;
 pub mod scene;
 // Re-export
 pub use entity::Entity;
 pub use scene::Scene;
@@ -10,20 +10,22 @@
 //!   and avoiding borrow checker issues during dynamic updates.
 //! - **Ergonomie**: Users interact only with entity-level operations (add/remove/get) rather than wgpu buffers/pipelines directly.
 use crate::math::Transform;
 use crate::resources::{Material, Mesh};
 use crate::scene::Entity;
 use std::collections::HashMap;
 use std::sync::Arc;
 /// Resource depot and entity graph. Stores Meshes and Materials keyed by identifier strings,
-/// and maps entity labels to their associated mesh+material pairs for rendering iteration.
+/// and maps entity labels to their associated `Entity` (mesh + material + transform) for rendering iteration.
 /// Created once during application setup; entities are added before the render loop starts.
 pub struct Scene {
    /// Map of mesh identifiers to owned `Arc<Mesh>` instances. Populated via `add_mesh()`.
    meshes: HashMap<String, Arc<Mesh>>,
    /// Map of material identifiers to owned `Arc<Material>` instances. Populated via `add_material()`.
    materials: HashMap<String, Arc<Material>>,
-    /// Map of entity labels to (mesh_id, material_id) associations. Populated via `add_entity()`.
+    /// Map of entity labels to `Entity` associations. Populated via `add_entity()` / `add_entity_with_transform()`.
-    entities: HashMap<String, (String, String)>,
+    entities: HashMap<String, Entity>,
 }
 impl Scene {
@@ -59,17 +61,33 @@ impl Scene {
        Ok(id.to_string())
    }
-    /// Associates an entity label with a mesh and material pair for rendering iteration.
+    /// Associates an entity label with a mesh and material pair for rendering iteration, using an identity transform.
    /// Inputs: label (entity identifier string), mesh_id (key into meshes map), material_id (key into materials map).
    /// Returns Ok(label) on success or Err(String) if either referenced resource does not exist.
    /// Called during scene initialization to build the renderable entity graph.
    /// Internal steps: 1) validate mesh_id exists → 2) validate material_id exists →
-    ///   3) insert association into entities HashMap.
+    ///   3) insert an `Entity` with identity transform into the entities HashMap.
    pub fn add_entity(
        &mut self,
        label: &str,
        mesh_id: &str,
        material_id: &str,
    ) -> Result<String, String> {
        self.add_entity_with_transform(label, mesh_id, material_id, Transform::identity())
    }
    /// Associates an entity label with a mesh and material pair together with an explicit world-space transform.
    /// Inputs: label (entity identifier string), mesh_id (key into meshes map), material_id (key into materials map),
    /// transform (world-space placement). Returns Ok(label) on success or Err(String) if either referenced resource does not exist.
    /// Called during scene initialization to build the renderable entity graph.
    /// Internal steps: 1) validate mesh_id exists → 2) validate material_id exists →
    ///   3) insert the `Entity` into the entities HashMap.
    pub fn add_entity_with_transform(
        &mut self,
        label: &str,
        mesh_id: &str,
        material_id: &str,
        transform: Transform,
    ) -> Result<String, String> {
        if !self.meshes.contains_key(mesh_id) {
            return Err(format!("Mesh '{}' does not exist.", mesh_id));
@@ -79,7 +97,7 @@ impl Scene {
        }
        self.entities.insert(
            label.to_string(),
-            (mesh_id.to_string(), material_id.to_string()),
+            Entity::new(mesh_id, material_id, transform),
        );
        Ok(label.to_string())
    }
@@ -96,16 +114,37 @@ impl Scene {
        self.materials.get(id)
    }
-    /// Iterates all entity associations, yielding (label, mesh_ref, material_ref) triples.
+    /// Iterates all entity associations, yielding (label, mesh_ref, material_ref, transform_ref) tuples.
    /// Called by the orchestrator during each render pass to draw every entity in order.
-    pub fn iter_entities(&self) -> impl Iterator<Item = (&str, &Arc<Mesh>, &Arc<Material>)> + '_ {
+    pub fn iter_entities(
-        self.entities.iter().map(|(label, (mesh_id, mat_id))| {
+        &self,
-            let mesh = self.meshes.get(mesh_id).unwrap(); // safe: add_entity validates existence
+    ) -> impl Iterator<Item = (&str, &Arc<Mesh>, &Arc<Material>, &Transform)> + '_ {
-            let mat = self.materials.get(mat_id).unwrap(); // same invariant
+        self.entities.iter().map(|(label, entity)| {
-            (label.as_str(), mesh, mat)
+            let mesh = self.meshes.get(entity.mesh_id()).unwrap(); // safe: add_entity validates existence
            let mat = self.materials.get(entity.material_id()).unwrap(); // same invariant
            (label.as_str(), mesh, mat, entity.transform())
        })
    }
    /// Returns a reference to the transform of the entity with the given label, if it exists.
    /// Called by the user to read an entity's current placement during updates.
    pub fn entity_transform(&self, label: &str) -> Option<&Transform> {
        self.entities.get(label).map(|e| e.transform())
    }
    /// Overwrites the transform of the entity with the given label.
    /// Returns true if the entity existed and was updated, false otherwise.
    /// Called by the user to move/rotate/scale an entity during `AppHandler::update`.
    pub fn set_entity_transform(&mut self, label: &str, transform: Transform) -> bool {
        match self.entities.get_mut(label) {
            Some(entity) => {
                entity.set_transform(transform);
                true
            }
            None => false,
        }
    }
    /// Removes an entity from the graph without freeing its underlying resources.
    /// The referenced Mesh and Material remain registered; only the association is dropped.
    /// Called during dynamic updates when an entity should be hidden or removed temporarily.
Author	SHA1	Message	Date
Jérôme Bousquié	252db88980	feat(lib): expose Camera and Entity with Transform (data foundation) Étape 1 du plan 3D+Phong : fondations de données sans toucher au rendu. - resources: exporte Camera (fichier auparavant orphelin), migre les fonctions glam dépréciées look_at_rh/perspective_rh_gl vers glam::camera::rh::* (induit par la compilation de camera.rs, sinon 2 warnings). - scene: nouveau type Entity { mesh_id, material_id, transform } (scene/entity.rs); Scene::entities passe de HashMap<String,(String,String)> à HashMap<String,Entity>. - API: add_entity conserve sa signature (transform identité par défaut), ajout de add_entity_with_transform, entity_transform, set_entity_transform; iter_entities rend désormais aussi le &Transform. renderer et examples inchangés a posteriori. - Validation: cargo check --workspace et examples 0 warning, cargo doc 0 warning, fmt OK.	2026-09-16 15:26:16 +02:00
Jérôme Bousquié	91007853d9	docs: note pour mémoire sur le couplage au runtime async (pollster) La lib n'a qu'un seul point de couplage au runtime (block_on dans app.rs) ; on ne crée volontairement pas d'abstraction à ce stade. Consigné dans PLAN.md et ARCHI_APP.md : isoler derrière un module-pivot unique si la lib acquiert d'autres appels async. Corrige aussi l'item check-list pollster devenu faux dev-dependencies -> dependencies depuis la migration winit 0.30.	2026-09-16 14:58:51 +02:00
Jérôme Bousquié	8eec38e55c	fix(lib): migrate to winit 0.30 ApplicationHandler model winit 0.30.13 removed WindowBuilder and deprecated EventLoop::run. Move window/GPU creation into ApplicationHandler::resumed, expose AppHandler::setup hook, switch App::run to run_app, and migrate both examples. pollster becomes a regular dependency (used by app.rs).	2026-09-16 14:17:11 +02:00
Jérôme Bousquié	bb7fab4911	docs(plan): lock uniform scheme (2 bind groups) and uniform types location (resources/uniform.rs)	2026-09-16 13:40:30 +02:00
Jérôme Bousquié	14e18cda06	docs(plan): unify on a single pipeline layout (2D as degenerate 3D)	2026-09-16 12:06:56 +02:00
Jérôme Bousquié	f81144918a	docs: detailed plan for 3D+Phong step in DRAFT.md	2026-09-16 11:46:33 +02:00
Jérôme Bousquié	b764bbc83d	docs: complete README coherence for scene auto-render step	2026-09-16 11:23:58 +02:00
Jérôme Bousquié	9d631b686a	docs: clarify PipelineCache item in plan after scene auto-render	2026-09-16 11:18:08 +02:00
Jérôme Bousquié	0a7ebf62ad	docs: erase DRAFT scratchpad content for next step	2026-09-16 11:16:48 +02:00
Jérôme Bousquié	0560c1897f	docs: record completed scene auto-render step in plan, roadmap, README	2026-09-16 11:16:48 +02:00