From 8166a34fc5dafd56a7a0d29bb6b7ed4db0654a45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Morten=20Johan=20S=C3=B8rvig?= <morten.sorvig@digia.com>
Date: Thu, 12 Dec 2013 14:17:03 +0100
Subject: [PATCH] Support running Qt apps on the integrated GPU

By default starting an app that uses OpenGL will
switch machines with dual graphics hardware over
to the discrete GPU. This causes a delay at startup
and possibly increased power usage.

It is possible to prevent the switch:

1) Add the NSOpenGLPFAAllowOfflineRenderers attribute
to the OpenGL pixel format. This is done in this commit.

2) Add <key>NSSupportsAutomaticGraphicsSwitching</key><true/>
to the apps Info.plist. This final opt-in is left to
the app author.

Change-Id: Ibff56fd7770a6b7f8041c8bb60bf290eed24330a
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
---
 src/platformsupport/cglconvenience/cglconvenience.mm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/platformsupport/cglconvenience/cglconvenience.mm b/src/platformsupport/cglconvenience/cglconvenience.mm
index 12ae5965dfe..50c39a12e00 100644
--- a/src/platformsupport/cglconvenience/cglconvenience.mm
+++ b/src/platformsupport/cglconvenience/cglconvenience.mm
@@ -121,6 +121,7 @@ void *qcgl_createNSOpenGLPixelFormat(const QSurfaceFormat &format)
               << NSOpenGLPFASamples << (NSOpenGLPixelFormatAttribute) format.samples();
     }
 
+    attrs << NSOpenGLPFAAllowOfflineRenderers;
     attrs << 0;
 
     NSOpenGLPixelFormat* pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attrs.constData()];