From b5bc4fd8b470cfe4198206e75c713dd71a22ffaa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Tue, 24 Jan 2017 22:08:17 +0100
Subject: [PATCH] [macos] allow using the integrated GPU on dual-GPU machines

---
 platform/darwin/src/headless_display_cgl.cpp | 2 ++
 platform/macos/app/Info.plist                | 2 ++
 platform/macos/src/MGLOpenGLLayer.mm         | 1 +
 3 files changed, 5 insertions(+)

diff --git a/platform/darwin/src/headless_display_cgl.cpp b/platform/darwin/src/headless_display_cgl.cpp
index 90d187d3d..b38eb6b62 100644
--- a/platform/darwin/src/headless_display_cgl.cpp
+++ b/platform/darwin/src/headless_display_cgl.cpp
@@ -20,6 +20,8 @@ HeadlessDisplay::Impl::Impl() {
     CGLPixelFormatAttribute attributes[] = {
         kCGLPFAOpenGLProfile,
         static_cast<CGLPixelFormatAttribute>(kCGLOGLPVersion_Legacy),
+        kCGLPFASupportsAutomaticGraphicsSwitching,
+        kCGLPFAAllowOfflineRenderers, // Allows using the integrated GPU
         static_cast<CGLPixelFormatAttribute>(0)
     };
 
diff --git a/platform/macos/app/Info.plist b/platform/macos/app/Info.plist
index cc7037f58..21b86bfc7 100644
--- a/platform/macos/app/Info.plist
+++ b/platform/macos/app/Info.plist
@@ -52,5 +52,7 @@
 	<string>MainMenu</string>
 	<key>NSPrincipalClass</key>
 	<string>NSApplication</string>
+	<key>NSSupportsAutomaticGraphicsSwitching</key>
+	<true/>
 </dict>
 </plist>
diff --git a/platform/macos/src/MGLOpenGLLayer.mm b/platform/macos/src/MGLOpenGLLayer.mm
index 296e30179..8f8588486 100644
--- a/platform/macos/src/MGLOpenGLLayer.mm
+++ b/platform/macos/src/MGLOpenGLLayer.mm
@@ -30,6 +30,7 @@
         NSOpenGLPFADepthSize, 16,
         NSOpenGLPFAStencilSize, 8,
         NSOpenGLPFAScreenMask, mask,
+        NSOpenGLPFAAllowOfflineRenderers, // Allows using the integrated GPU
         0
     };
     return [[NSOpenGLPixelFormat alloc] initWithAttributes:pfas];