From be9a43f1777a4ad41a51159916e35e44053fa33e Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sun, 17 Mar 2019 18:20:24 +0200
Subject: [PATCH] - added temp hack for perf issue with Metal layer in
 fullscreen

---
 src/posix/cocoa/i_video.mm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index f89331ede..682b2239c 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -391,6 +391,16 @@ public:
 		fb->SetMode(fullscreen, vid_hidpi);
 		fb->SetSize(fb->GetClientWidth(), fb->GetClientHeight());
 
+		// This lame hack is a temporary workaround for strange performance issues
+		// with fullscreen window and Core Animation's Metal layer
+		// It is somehow related to initial window level and flags
+		// Toggling fullscreen -> window -> fullscreen mysteriously solves the problem
+		if (ms_isVulkanEnabled && fullscreen)
+		{
+			fb->SetMode(false, vid_hidpi);
+			fb->SetMode(true, vid_hidpi);
+		}
+
 		return fb;
 	}