From d1d08ef99f9b4ea6726df92ef313e320caf32f24 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Thu, 6 Apr 2017 16:00:09 +0200
Subject: [PATCH] Cocoa: Fix EGL support

This adds support for using GLFW with EGL backends on macOS.  While EGL
isn't available by default on macOS, there are third-party
implementations like SwiftShader.

The addition of MoltenVK support added an override to makeBackingLayer.
In non-Vulkan mode, this means that we are returning nil from that
function.  The NSGL implementation creates this layer manually later on,
but other OpenGL backends don't necessarily do that.

Closes #985.
---
 src/cocoa_window.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index d2b207bb..0c40c71a 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -423,6 +423,9 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 
 - (id)makeBackingLayer
 {
+    if (!window->ns.layer) {
+        window->ns.layer = [super makeBackingLayer];
+    }
     return window->ns.layer;
 }