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[cocoa] Disable offline renderers for dual AMD FirePro GPU 

The AMD FirePro dual gpus on the Mac Pro have a problem with offline
renderers in Chromium. Therefore, Chromium and thus Qt WebEngine
disable this option via the pixel format attributes.

The Qt Cocoa plugin on the other hand enables it in the recent versions,
causing context creation in Qt WebEngine to fail when run on a Mac Pro
with dual AMD FirePro gpus due to incompatible context options.

This patch uses the environment variable QT_MAC_PRO_WEBENGINE_WORKAROUND
which is set by Qt WebEngine upon application startup if the application
is running on a late 2013 Mac Pro. It should typically not be set from
anywhere else.

[ChangeLog] Offline renderers will be disabled when the application is
using Qt WebEngine and running on one of the late 2013 Mac Pro models.

Fixes: QTBUG-70062
Change-Id: I0b0831efb6f4073ebd37672040aaed6370853fc0
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
bb10
Michael Brüning 2018-10-16 18:17:56 +02:00
parent 0cb44e2cfb
commit 72bedd49bf
1 changed files with 7 additions and 1 deletions
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8
src/plugins/platforms/cocoa/qcocoaglcontext.mm
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@ -456,7 +456,13 @@ NSOpenGLPixelFormat *QCocoaGLContext::createNSOpenGLPixelFormat(const QSurfaceFo
if (format.stereo())
attrs << NSOpenGLPFAStereo;
attrs << NSOpenGLPFAAllowOfflineRenderers;
//Workaround for problems with Chromium and offline renderers on the lat 2013 MacPros.
//FIXME: Think if this could be solved via QSurfaceFormat in the future.
static bool offlineRenderersAllowed = qEnvironmentVariableIsEmpty("QT_MAC_PRO_WEBENGINE_WORKAROUND");
if (offlineRenderersAllowed) {
// Allow rendering on GPUs without a connected display
attrs << NSOpenGLPFAAllowOfflineRenderers;
}
QByteArray useLayer = qgetenv("QT_MAC_WANTS_LAYER");
if (!useLayer.isEmpty() && useLayer.toInt() > 0) {