From 931b3e8d234f16acc8560da7a19571178fbdba65 Mon Sep 17 00:00:00 2001
From: Ned Loynd <ned@loynd.com>
Date: Tue, 17 Jan 2023 08:55:01 +1100
Subject: [PATCH] Cocoa: Patched use of macOS 10.9 window occlusion API for
 macOS 10.8 compatibility

This fixes building against macOS SDKs older than 10.9, noted in #2161.
---
 CONTRIBUTORS.md    |  1 +
 README.md          |  1 +
 src/cocoa_window.m | 12 +++++++++++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 47301dae..8c8ffba6 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -124,6 +124,7 @@ video tutorials.
  - Marco Lizza
  - Eyal Lotem
  - Aaron Loucks
+ - Ned Loynd
  - Luflosi
  - lukect
  - Tristam MacDonald
diff --git a/README.md b/README.md
index 8b4a1546..d5aa35ed 100644
--- a/README.md
+++ b/README.md
@@ -269,6 +269,7 @@ information on what to include when reporting a bug.
    application (#2110)
  - [Cocoa] Bugfix: The Vulkan loader was not loaded from the `Frameworks` bundle
    subdirectory (#2113,#2120)
+ - [Cocoa] Bugfix: Patched use of macOS 10.9 window occlusion API for macOS 10.8 compatibility
  - [X11] Bugfix: The CMake files did not check for the XInput headers (#1480)
  - [X11] Bugfix: Key names were not updated when the keyboard layout changed
    (#1462,#1528)
diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index 6f8aa978..b091dc21 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -37,6 +37,12 @@
 //       having been (according to documentation) added in Mac OS X 10.7
 #define NSWindowCollectionBehaviorFullScreenNone (1 << 9)
 
+// HACK: This enum value is only available on Mac OS X 10.9 onwards,
+//       so it needs to be defined on prior versions
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
+#define NSWindowOcclusionStateVisible (1UL << 1)
+#endif
+
 // Returns whether the cursor is in the content area of the specified window
 //
 static GLFWbool cursorInContentArea(_GLFWwindow* window)
@@ -311,7 +317,11 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 
 - (void)windowDidChangeOcclusionState:(NSNotification* )notification
 {
-    if ([window->ns.object occlusionState] & NSWindowOcclusionStateVisible)
+    if (
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
+        [window->ns.object respondsToSelector:@selector(occlusionState)] && (NSUInteger)
+#endif
+        [window->ns.object occlusionState] & NSWindowOcclusionStateVisible)
         window->ns.occluded = GLFW_FALSE;
     else
         window->ns.occluded = GLFW_TRUE;