refactor renderer responsable + docs + schema

lib/context.rs

@@ -14,6 +14,7 @@ use wgpu::{Adapter, Device, Instance, Queue, Surface};
 use winit::window::Window;
 
 use crate::error::WsgError;
+use crate::frame::Frame;
 
 /// Represents the GPU context. Holds all WGPU objects needed for rendering.
 /// Created once at startup and shared across frames via Arc.
@@ -78,9 +79,8 @@ impl Context {
         adapter: &wgpu::Adapter,
         width: u32,
         height: u32,
-    ) -> Result<(), WsgError> {
+    ) -> Result<wgpu::TextureFormat, WsgError> {
         let caps = self.surface.get_capabilities(adapter);
-        // Prefer SRGB format for color accuracy; fall back to first available if none (technical point documented above).
         let format = caps
             .formats
             .iter()
@@ -89,25 +89,25 @@ impl Context {
             .or(caps.formats.first().copied())
             .ok_or(WsgError::SurfaceIncompatible)?;
 
-        let alpha_mode = caps
-            .alpha_modes
-            .first()
-            .copied()
-            .ok_or(WsgError::SurfaceIncompatible)?;
-
         let config = wgpu::SurfaceConfiguration {
             usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
             format,
             width,
             height,
-            present_mode: wgpu::PresentMode::Fifo, // V-Sync activated
-            alpha_mode,                            // first supported alpha mode
+            present_mode: wgpu::PresentMode::Fifo,
+            alpha_mode: caps
+                .alpha_modes
+                .first()
+                .copied()
+                .ok_or(WsgError::SurfaceIncompatible)?,
             view_formats: vec![],
             color_space: wgpu::SurfaceColorSpace::Srgb,
             desired_maximum_frame_latency: 2,
         };
         self.surface.configure(&self.device, &config);
-        Ok(())
+
+        // On retourne le format choisi pour que le Renderer puisse le stocker
+        Ok(format)
     }
 
     /// Acquires the next surface texture for rendering this frame. Returns an error variant
@@ -134,4 +134,10 @@ impl Context {
         // In wgpu 30, present() moved from SurfaceTexture::present() to Queue::present(frame).
         self.queue.present(frame);
     }
+
+    /// Returns a Frame wrapper around the current surface texture and its TextureView.
+    /// Called by the orchestrator at frame start; equivalent to Context::begin_frame() + Frame construction.
+    pub fn get_next_frame(&self) -> Frame {
+        Frame::new(&self.surface)
+    }
 }