From 1f24a4e520004d48799a27b159432aa0b8634628 Mon Sep 17 00:00:00 2001
From: lat9nq <lat9nq@gmail.com>
Date: Mon, 7 Mar 2022 03:35:34 -0500
Subject: emu_window: Create a way to Cancel the exit of a Scoped

If a GraphicsContext is destroyed before its Scoped is destroyed, this
causes a crash as the Scoped tries to call a method in the destroyed
context on exit.

Add a way to Cancel the call when we know that calling the
GraphicsContext will not work.
---
 src/core/frontend/emu_window.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/core/frontend/emu_window.h')

diff --git a/src/core/frontend/emu_window.h b/src/core/frontend/emu_window.h
index e413a520a..b3bffecb2 100644
--- a/src/core/frontend/emu_window.h
+++ b/src/core/frontend/emu_window.h
@@ -42,11 +42,20 @@ public:
             context.MakeCurrent();
         }
         ~Scoped() {
-            context.DoneCurrent();
+            if (active) {
+                context.DoneCurrent();
+            }
+        }
+
+        /// In the event that context was destroyed before the Scoped is destroyed, this provides a
+        /// mechanism to prevent calling a destroyed object's method during the deconstructor
+        void Cancel() {
+            active = false;
         }
 
     private:
         GraphicsContext& context;
+        bool active{true};
     };
 
     /// Calls MakeCurrent on the context and calls DoneCurrent when the scope for the returned value
-- 
cgit v1.2.3