render iteration

CLAUDE.md

@@ -81,14 +81,13 @@ As of December 2025, SDL3 Rust bindings are usable but still maturing:
 **Using wgpu instead of OpenGL:**
 - Modern GPU API abstraction (Vulkan/Metal/DX12/OpenGL backends)
 - Better cross-platform support
-- WGSL shader language (WebGPU Shading Language)
+- WESL shader language (WebGPU Shading Language)
 - Type-safe API with explicit resource management
 - Low-res framebuffer rendering with 3-bit RGB dithering (retro aesthetic)
 
 **Rendering Architecture:**
 - wgpu for 3D mesh rendering with custom shaders
 - Low-resolution framebuffer (160×120) upscaled to window size
-- Bayer 8×8 dithering for 3-bit RGB color (8 colors total)
 - Multiple rendering pipelines: standard meshes and terrain
 - Separate bind groups for different material types
 
@@ -141,7 +140,6 @@ SDL Events → InputState → player_input_system() → InputComponent → movem
 
 **wgpu Rendering System:**
 - Low-res framebuffer (160×120) renders to texture
-- Bayer 8×8 dithering reduces colors to 3-bit RGB (8 colors)
 - Final blit pass upscales framebuffer to window using nearest-neighbor sampling
 - Depth buffer for 3D rendering with proper occlusion
 
@@ -199,10 +197,10 @@ cargo fmt
 
 ## Shader Files
 
-WGSL shaders are stored in the `shaders/` directory:
-- `shaders/standard.wgsl` - Standard mesh rendering with directional lighting
-- `shaders/terrain.wgsl` - Terrain rendering with shadow mapping (no displacement)
-- `shaders/blit.wgsl` - Fullscreen blit for upscaling low-res framebuffer
+WESL shaders are stored in the `src/shaders/` directory:
+- `src/shaders/standard.wesl` - Standard mesh rendering with directional lighting
+- `src/shaders/terrain.wesl` - Terrain rendering with shadow mapping (no displacement)
+- `src/shaders/blit.wgsl` - Fullscreen blit for upscaling low-res framebuffer
 
 Shaders are loaded at runtime via `std::fs::read_to_string()`, allowing hot-reloading by restarting the application.
 
@@ -230,7 +228,7 @@ Shaders are loaded at runtime via `std::fs::read_to_string()`, allowing hot-relo
 
 **Rendering:**
 - `render.rs` - wgpu renderer, pipelines, bind groups, DrawCall execution
-- `shader.rs` - Standard mesh shader (WGSL) with diffuse+ambient lighting
+- `shader.rs` - Standard mesh shader (WESL) with diffuse+ambient lighting
 - `terrain.rs` - Terrain entity spawning, glTF loading, EXR heightmap → physics collider
 - `postprocess.rs` - Low-res framebuffer and blit shader for upscaling
 - `mesh.rs` - Vertex/Mesh structs, plane/cube mesh generation, glTF loading
@@ -578,86 +576,3 @@ Time::init(); // In main() before game loop
 let time = Time::get_time_elapsed(); // Anywhere in code
 ```
 
-## Current Implementation Status
-
-### Implemented Features
-
-**ECS Architecture:**
-- ✅ Full ECS conversion completed
-- ✅ Entity system with EntityManager (spawn/despawn/query)
-- ✅ Component storages (Transform, Mesh, Physics, Movement, Input, PlayerTag, StateMachine)
-- ✅ Systems pipeline (input → state machine → physics → physics sync → render)
-- ✅ No `Rc<RefCell<>>` - clean component ownership
-- ✅ Event bus integrated as complementary to systems
-
-**Core Rendering:**
-- ✅ wgpu renderer with Vulkan backend
-- ✅ Low-res framebuffer (160×120) with Bayer dithering
-- ✅ Multiple render pipelines (standard mesh + terrain)
-- ✅ Directional lighting with diffuse + ambient
-- ✅ Terrain rendering (glTF with baked heights, no shader displacement)
-- ✅ EXR heightmap loading for physics colliders
-- ✅ glTF mesh loading
-- ✅ render_system (ECS-based DrawCall generation)
-
-**Input System:**
-- ✅ Two-layer input pipeline (InputState → InputComponent)
-- ✅ player_input_system converts raw input to gameplay commands
-- ✅ SDL event handling in InputState
-- ✅ Per-entity InputComponent for controllable entities
-
-**Camera & Debug:**
-- ✅ 3D camera with rotation (yaw/pitch)
-- ✅ Noclip mode for development (in debug/noclip.rs)
-- ✅ Mouse look with relative mouse mode
-- ✅ Toggle with 'I' key, 'N' for noclip mode
-
-**Physics:**
-- ✅ rapier3d integration with PhysicsManager singleton
-- ✅ PhysicsComponent storage (rigidbody/collider handles)
-- ✅ physics_sync_system (syncs physics → transforms)
-- ✅ Physics step integrated into game loop
-- ⚠️ Ground detection not yet implemented
-- ⚠️ Movement physics not yet connected
-
-**State Machines:**
-- ✅ Generic StateMachine implementation
-- ✅ StateMachineStorage (ECS component)
-- ✅ state_machine_system updates all state machines
-- ✅ Transitions can query ECS components
-- ⚠️ Player state transitions not yet configured
-
-**Player:**
-- ✅ Player entity spawning function
-- ✅ Components: Transform, Mesh, Physics, Movement, Input, PlayerTag
-- ⚠️ Movement system not yet implemented
-- ⚠️ State machine not yet attached to player
-- ⚠️ Currently inactive (noclip camera used instead)
-
-**Movement Configuration:**
-- ✅ Horizontal movement config (Bezier acceleration curves)
-- ✅ Vertical movement config (jump mechanics)
-- ✅ MovementComponent storage
-- ⚠️ Movement system not yet implemented
-- ⚠️ Not yet integrated with physics
-
-### Not Yet Implemented
-
-- ❌ Movement system (apply InputComponent → physics velocities)
-- ❌ Ground detection and collision response
-- ❌ Player state machine configuration
-- ❌ Camera follow behavior (tracks player entity)
-- ❌ Snow deformation compute shaders
-- ❌ Debug UI system
-
-### Current Focus
-
-**ECS migration is complete!** The architecture is now fully entity-component-system based with clean separation of data and logic. The next steps are:
-
-1. Implement movement_system to apply InputComponent to physics
-2. Configure player state machine transitions
-3. Implement ground detection
-4. Add camera follow system
-5. Integrate snow deformation
-
-The noclip camera mode serves as the primary navigation method for testing. Press 'N' to toggle noclip mode.