ajout material et pipeline_cache

lib/conf.rs

@@ -1,10 +1,16 @@
 //! # Configuration Module
 //!
-//! Holds shared constants for the WSG library, such as shader paths and other compilation-time values.
-//! This module centralizes configuration so that it can be imported by any submodule without duplicating literals.
+//! Holds shared constants for the WSG library — primarily shader paths and embedded WGSL source code.
+//! Centralized here so all submodules import from one place instead of duplicating literal strings.
+//! This enables the PipelineCache to fall back to an embedded default shader when the file-based one is missing.
+//!
+//! ## Interaction with Other Modules
+//! - **pipeline_cache::load_shader()** reads `BASIC_SHADER_PATH` from disk; if unreadable, falls back to `BASIC_SHADER`.
+//! - Both constants are compile-time values (`include_str!`) ensuring the fallback shader is always available even without external files.
 
-/// Path to the default WGSL shader file (runtime).
+/// Path to the default WGSL shader file on disk (runtime). Used by PipelineCache::load_shader() for file-based loading.
 pub const BASIC_SHADER_PATH: &str = "assets/shaders/basic_shader.wgsl";
 
-/// The basic WGSL shader source, embedded at compile time as a fallback.
+/// The basic WGSL shader source code, embedded at compile time via `include_str!`.
+/// Serves as a fallback when `BASIC_SHADER_PATH` cannot be read at runtime.
 pub const BASIC_SHADER: &str = include_str!("../assets/shaders/basic_shader.wgsl");