diff --git a/examples/convert.rs b/examples/convert.rs
index bd066a9f71..722e811c61 100644
--- a/examples/convert.rs
+++ b/examples/convert.rs
@@ -1,5 +1,5 @@
 use serde::{Deserialize, Serialize};
-use std::{env, fs};
+use std::{env, fs, path::Path};
 
 #[derive(Hash, PartialEq, Eq, Serialize, Deserialize)]
 struct BindSource {
@@ -29,8 +29,12 @@ fn main() {
         println!("Call with <input> <output>");
         return;
     }
-    let in_ext_pos = args[1].rfind(".").expect("Input has no extension?");
-    let module = match &args[1][in_ext_pos..] {
+    let ext = Path::new(&args[1])
+        .extension()
+        .expect("Input has no extension?")
+        .to_str()
+        .unwrap();
+    let module = match ext {
         "spv" => {
             let input = fs::read(&args[1]).unwrap();
             naga::front::spv::parse_u8_slice(&input).unwrap()
@@ -39,8 +43,32 @@ fn main() {
             let input = fs::read_to_string(&args[1]).unwrap();
             naga::front::wgsl::parse_str(&input).unwrap()
         }
-        //#[cfg(feature = "glsl")] //TODO
-        //"glsl" | "vert" | "frag" | "comp" => {}
+        #[cfg(feature = "glsl")]
+        "vert" => {
+            let input = fs::read_to_string(&args[1]).unwrap();
+            naga::front::glsl::parse_str(&input, "main".to_string(), spirv::ExecutionModel::Vertex)
+                .unwrap()
+        }
+        #[cfg(feature = "glsl")]
+        "frag" => {
+            let input = fs::read_to_string(&args[1]).unwrap();
+            naga::front::glsl::parse_str(
+                &input,
+                "main".to_string(),
+                spirv::ExecutionModel::Fragment,
+            )
+            .unwrap()
+        }
+        #[cfg(feature = "glsl")]
+        "comp" => {
+            let input = fs::read_to_string(&args[1]).unwrap();
+            naga::front::glsl::parse_str(
+                &input,
+                "main".to_string(),
+                spirv::ExecutionModel::GLCompute,
+            )
+            .unwrap()
+        }
         other => panic!("Unknown input extension: {}", other),
     };