From c4686c2992417545e7a05a6a40ee9f1a8bbf3b96 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Fri, 16 Aug 2024 22:10:00 +0200
Subject: perf(engine): create OpenGL objects as needed instead of each frame

---
 engine/src/util.rs | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'engine/src/util.rs')

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
+    }
+}
-- 
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