From 6157b56b70328668f855458c8ab29f867061b9b0 Mon Sep 17 00:00:00 2001
From: Thomas Jowett <thomas_jowett@hotmail.co.uk>
Date: Fri, 9 Jun 2023 11:47:21 +0100
Subject: [PATCH] Added a check to see if the instance and physical device are
 valid before running

---
 src/main.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index ddec207..0c88ea1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -110,6 +110,14 @@ mod halvar {
         }
 
         pub fn run(self) {
+            if Arc::strong_count(&self.instance) == 0 {
+                println!("Cannot run application without a vulkan instance");
+                return;
+            }
+            if Arc::strong_count(&self.physical_device) == 0 {
+                println!("Cannot run application without a physical rendering device");
+                return;
+            }
             self.event_loop
                 .run(move |event, _, control_flow| match event {
                     Event::WindowEvent {