feat(loader): implemented faces and vertex extractors for Model

lithium-loader/Cargo.lock

@@ -2,10 +2,17 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "anyhow"
+version = "1.0.75"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
+
 [[package]]
 name = "lithium-loader"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "lithium-utils",
 ]
 

lithium-loader/Cargo.toml

@@ -9,3 +9,5 @@ authors = ["antifallobst"]
 
 [dependencies]
 lithium-utils = { path = "../lithium-utils" }
+
+anyhow = "1.0.75"

lithium-loader/src/lib.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use lithium_utils::{Vector2, Vector3};
 
 pub struct Vertex {
@@ -53,4 +54,12 @@ impl Model {
             faces,
         }
     }
+
+    pub fn faces(&self) -> &Vec<(u32, u32, u32)> {
+        &self.faces
+    }
+
+    pub fn vertex(&self, id: u32) -> Option<&Vertex> {
+        self.vertices.get(id as usize)
+    }
 }