init wgpu + doc + err robustes

lib/error.rs

@@ -0,0 +1,28 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum WsgError {
+    /// Error from the windowing system (winit)
+    #[error("Window system error (winit)")]
+    WindowSystem,
+
+    /// No suitable graphics adapter found
+    #[error("No graphics adapter found")]
+    NoAdapter,
+
+    /// Failed to create a WGPU device
+    #[error("Failed to create WGPU device")]
+    DeviceCreation,
+
+    /// Shader compilation or creation error
+    #[error("Shader compilation or creation error: {0}")]
+    ShaderError(String),
+
+    /// Internal WGPU error
+    #[error("Internal WGPU error: {0}")]
+    InternalWgpu(#[from] wgpu::RequestDeviceError),
+
+    /// Failed to create the rendering surface
+    #[error("Failed to create rendering surface")]
+    SurfaceCreation(wgpu::CreateSurfaceError),
+}