fix(engine): prevent creation of multiple windowing contexts

1 files changed, 16 insertions, 3 deletions

diff --git a/engine/src/windowing.rs b/engine/src/windowing.rs
index fac1c62..5cb34f7 100644
--- a/engine/src/windowing.rs
+++ b/engine/src/windowing.rs
@@ -54,6 +54,8 @@ const MESSAGE_FROM_APP_QUEUE_SIZE: usize = 512;
 
 const MESSAGE_TO_APP_QUEUE_SIZE: usize = 16; // Increase if more messages are added
 
+static CONTEXT_CREATED: AtomicBool = AtomicBool::new(false);
+
 declare_entity!(
     pub PHASE,
     (
@@ -73,7 +75,10 @@ impl crate::ecs::extension::Extension for Extension
 {
     fn collect(self, mut collector: crate::ecs::extension::Collector<'_>)
     {
-        collector.add_sole(Context::default()).ok();
+        if !CONTEXT_CREATED.load(Ordering::Relaxed) {
+            collector.add_sole(Context::new()).ok();
+        }
+
         collector.add_sole(Keyboard::default()).ok();
         collector.add_sole(Mouse::default()).ok();
         collector.add_sole(MouseButtons::default()).ok();
@@ -352,10 +357,18 @@ impl Context
     }
 }
 
-impl Default for Context
+impl Context
 {
-    fn default() -> Self
+    /// Returns a new windowing context.
+    ///
+    /// # Panics
+    /// Will panic if a windowing context have already been created.
+    pub fn new() -> Self
     {
+        if CONTEXT_CREATED.swap(true, Ordering::Relaxed) {
+            panic!("A windowing context have already been created");
+        }
+
         let message_from_app_queue = Arc::new(ArrayQueue::<MessageFromApp>::new(
             MESSAGE_FROM_APP_QUEUE_SIZE,
         ));