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/opengl/buffer.rs       | 13 +++++++++++++
 engine/src/opengl/vertex_array.rs | 11 +++++++++++
 2 files changed, 24 insertions(+)

(limited to 'engine/src/opengl')

diff --git a/engine/src/opengl/buffer.rs b/engine/src/opengl/buffer.rs
index 68a75fb..2be7f12 100644
--- a/engine/src/opengl/buffer.rs
+++ b/engine/src/opengl/buffer.rs
@@ -39,6 +39,19 @@ impl<Item> Buffer<Item>
     {
         self.buf
     }
+
+    /// Does a weak clone of this buffer. The buffer itself is NOT copied in any way this
+    /// function only copies the internal buffer ID.
+    ///
+    /// # Safety
+    /// The returned `Buffer` must not be dropped if another `Buffer` referencing the
+    /// same buffer ID is used later or if a [`VertexArray`] is used later.
+    ///
+    /// [`VertexArray`]: crate::opengl::vertex_array::VertexArray
+    pub unsafe fn clone_weak(&self) -> Self
+    {
+        Self { buf: self.buf, _pd: PhantomData }
+    }
 }
 
 impl<Item> Drop for Buffer<Item>
diff --git a/engine/src/opengl/vertex_array.rs b/engine/src/opengl/vertex_array.rs
index e1e1a15..da5d91e 100644
--- a/engine/src/opengl/vertex_array.rs
+++ b/engine/src/opengl/vertex_array.rs
@@ -125,6 +125,17 @@ impl VertexArray
     {
         unsafe { gl::BindVertexArray(self.array) }
     }
+
+    /// Does a weak clone of this vertex array. The vertex array itself is NOT copied in
+    /// any way this function only copies the internal vertex array ID.
+    ///
+    /// # Safety
+    /// The returned `VertexArray` must not be dropped if another `VertexArray`
+    /// referencing the same vertex array ID is used later.
+    pub unsafe fn clone_unsafe(&self) -> Self
+    {
+        Self { array: self.array }
+    }
 }
 
 impl Drop for VertexArray
-- 
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