From 52c26458545b4993ac2e69f27e87664962fd3224 Mon Sep 17 00:00:00 2001
From: Jonah Ryan-Davis <8729214+jonahryandavis@users.noreply.github.com>
Date: Fri, 25 Oct 2019 10:29:12 -0600
Subject: [PATCH] build: BUILD.gn missing defines for MacOS

BUILD.gn does not define VK_USE_PLATFORM_METAL_EXT for MacOS
---
 BUILD.gn | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/BUILD.gn b/BUILD.gn
index 5c70229..56c115d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -28,6 +28,9 @@ config("vulkan_headers_config") {
   if (is_fuchsia) {
     defines = [ "VK_USE_PLATFORM_FUCHSIA" ]
   }
+  if (is_mac) {
+    defines = [ "VK_USE_PLATFORM_METAL_EXT" ]
+  }
 }
 
 # Vulkan headers only, no compiled sources.