perf(engine): create OpenGL objects as needed instead of each frame

1 files changed, 37 insertions, 0 deletions

diff --git a/engine/src/util.rs b/engine/src/util.rs
index 532bdee..8e93982 100644
--- a/engine/src/util.rs
+++ b/engine/src/util.rs
@@ -9,6 +9,9 @@ macro_rules! try_option {
     };
 }
 
+use std::mem::ManuallyDrop;
+use std::ops::{Deref, DerefMut};
+
 pub(crate) use try_option;
 
 macro_rules! or {
@@ -93,3 +96,37 @@ macro_rules! builder {
 }
 
 pub(crate) use builder;
+
+/// Wrapper that ensures the contained value will never be dropped.
+#[derive(Debug)]
+pub struct NeverDrop<Value>
+{
+    value: ManuallyDrop<Value>,
+}
+
+impl<Value> NeverDrop<Value>
+{
+    #[must_use]
+    pub fn new(value: Value) -> Self
+    {
+        Self { value: ManuallyDrop::new(value) }
+    }
+}
+
+impl<Value> Deref for NeverDrop<Value>
+{
+    type Target = Value;
+
+    fn deref(&self) -> &Self::Target
+    {
+        &*self.value
+    }
+}
+
+impl<Value> DerefMut for NeverDrop<Value>
+{
+    fn deref_mut(&mut self) -> &mut Self::Target
+    {
+        &mut *self.value
+    }
+}