From 64d5f948e43b4be93e3a4541c87dcce74c948df4 Mon Sep 17 00:00:00 2001
From: Andreas Reich <andreas@rerun.io>
Date: Fri, 26 Jul 2024 10:10:23 +0200
Subject: [PATCH] Workaround for wgpu crash when surface is dropped last
 (#4876)

* Fixes https://github.com/emilk/egui/issues/4874
* Details see https://github.com/gfx-rs/wgpu/pull/6052
---
 crates/egui-wgpu/src/winit.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/crates/egui-wgpu/src/winit.rs b/crates/egui-wgpu/src/winit.rs
index 46db8821..f0644ee1 100644
--- a/crates/egui-wgpu/src/winit.rs
+++ b/crates/egui-wgpu/src/winit.rs
@@ -96,6 +96,17 @@ pub struct Painter {
     surfaces: ViewportIdMap<SurfaceState>,
 }
 
+impl Drop for Painter {
+    fn drop(&mut self) {
+        // Drop surfaces before dropping the render state.
+        //
+        // This is a workaround for a bug in wgpu 22.0.0.
+        // Fixed in https://github.com/gfx-rs/wgpu/pull/6052
+        // Remove with wgpu 22.1.0 update!
+        self.surfaces.clear();
+    }
+}
+
 impl Painter {
     /// Manages [`wgpu`] state, including surface state, required to render egui.
     ///