Trigger demo quit from applicationWillTerminate

Allows for a clean shutdown of the rendering thread (CVDisplayLink) whilst the main thread is exiting

cube/macOS/cube/AppDelegate.m

@@ -17,6 +17,7 @@
  */
 
 #import "AppDelegate.h"
+#import "DemoViewController.h"
 
 @interface AppDelegate ()
 
@@ -29,7 +30,15 @@ - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
 }
 
 - (void)applicationWillTerminate:(NSNotification *)aNotification {
-    // Insert code here to tear down your application
+    NSApplication *app = aNotification.object;
+    NSArray<NSWindow *> *windows = app.windows;
+    for (NSUInteger i = 0; i < windows.count; ++i) {
+        NSViewController *viewController = windows[i].contentViewController;
+        if ([viewController isKindOfClass:[DemoViewController class]]) {
+            [(DemoViewController *)viewController quit];
+            break;
+        }
+    }
 }
 
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {

cube/macOS/cube/DemoViewController.h

@@ -23,6 +23,9 @@
 
 /** The main view controller for the demo storyboard. */
 @interface DemoViewController : NSViewController
+
+- (void)quit;
+
 @end
 
 #pragma mark -

cube/macOS/cube/DemoViewController.m

@@ -33,11 +33,15 @@ @implementation DemoViewController {
 }
 
 - (void)dealloc {
-    demo_cleanup(&demo);
-    CVDisplayLinkRelease(_displayLink);
+    [self quit];
     [super dealloc];
 }
 
+- (void)quit {
+    CVDisplayLinkRelease(_displayLink);
+    demo_cleanup(&demo);
+}
+
 /** Since this is a single-view app, initialize Vulkan during view loading. */
 - (void)viewDidLoad {
     [super viewDidLoad];

cube/macOS/cubepp/AppDelegate.mm

@@ -17,6 +17,7 @@
  */
 
 #import "AppDelegate.h"
+#import "DemoViewController.h"
 
 @interface AppDelegate ()
 
@@ -29,7 +30,15 @@ - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
 }
 
 - (void)applicationWillTerminate:(NSNotification *)aNotification {
-    // Insert code here to tear down your application
+    NSApplication *app = aNotification.object;
+    NSArray<NSWindow *> *windows = app.windows;
+    for (NSUInteger i = 0; i < windows.count; ++i) {
+        NSViewController *viewController = windows[i].contentViewController;
+        if ([viewController isKindOfClass:[DemoViewController class]]) {
+            [(DemoViewController *)viewController quit];
+            break;
+        }
+    }
 }
 
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {

cube/macOS/cubepp/DemoViewController.h

@@ -23,6 +23,9 @@
 
 /** The main view controller for the demo storyboard. */
 @interface DemoViewController : NSViewController
+
+- (void)quit;
+
 @end
 
 #pragma mark -

cube/macOS/cubepp/DemoViewController.mm

@@ -33,11 +33,15 @@ @implementation DemoViewController {
 }
 
 - (void)dealloc {
-    demo.cleanup();
-    CVDisplayLinkRelease(_displayLink);
+    [self quit];
     [super dealloc];
 }
 
+- (void)quit {
+    CVDisplayLinkRelease(_displayLink);
+    demo.cleanup();
+}
+
 /** Since this is a single-view app, initialize Vulkan during view loading. */
 - (void)viewDidLoad {
     [super viewDidLoad];