From a0386e535c064a15549c829b4656a4cce8df5877 Mon Sep 17 00:00:00 2001
From: BayLee4 <63376748+BayLee4@users.noreply.github.com>
Date: Thu, 10 Oct 2024 17:57:21 +0200
Subject: [PATCH] Cocoa Port: Fix mixed retina/non-retina displays bug

---
 .../cocoa/userinterface/DisplayWindowController.mm       | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/desmume/src/frontend/cocoa/userinterface/DisplayWindowController.mm b/desmume/src/frontend/cocoa/userinterface/DisplayWindowController.mm
index 524c03298..9c7943662 100644
--- a/desmume/src/frontend/cocoa/userinterface/DisplayWindowController.mm
+++ b/desmume/src/frontend/cocoa/userinterface/DisplayWindowController.mm
@@ -1465,6 +1465,15 @@ static std::unordered_map<NSScreen *, DisplayWindowController *> _screenMap; //
 - (void)windowDidChangeScreen:(NSNotification *)notification
 {
 	[self updateDisplayID];
+#if defined(MAC_OS_X_VERSION_10_7) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7)
+	NSScreen *screen = [[self window] screen];
+	// Set up the scaling factor if this is a Retina window
+	if ([screen respondsToSelector:@selector(backingScaleFactor)])
+	{
+		float scaleFactor = [screen backingScaleFactor];
+		[[[self view] cdsVideoOutput] clientDisplay3DView]->Get3DPresenter()->SetScaleFactor(scaleFactor);
+	}
+#endif
 }
 
 #if defined(MAC_OS_X_VERSION_10_7) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7)