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eglfs/imx6: enable double buffering and vsync by default

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Enabling vsync and double buffering improves the overall impression.
Enabling by default helps to get the best "out of the box"

If not desired, one can disable this behavior via:
export QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER=1

Change-Id: I21ce5366ea5829140d8103cf2dbd8c487d079db6
Reviewed-by: Donald Carr <sirspudd@gmail.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
This commit is contained in:
Thomas Senyk 2013-09-25 13:22:55 +02:00 committed by The Qt Project
parent 894f867090
commit 76359dab8e
1 changed files with 10 additions and 0 deletions
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10
mkspecs/devices/linux-imx6-g++/qeglfshooks_imx6.cpp
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@ -41,6 +41,7 @@
#include "qeglfshooks.h"
#include <EGL/eglvivante.h>
#include <QDebug>
QT_BEGIN_NAMESPACE
@ -62,6 +63,15 @@ private:
QEglFSImx6Hooks::QEglFSImx6Hooks()
{
int width, height;
bool multiBufferNotEnabledYet = qEnvironmentVariableIsEmpty("FB_MULTI_BUFFER");
bool multiBuffer = qEnvironmentVariableIsEmpty("QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER");
if (multiBufferNotEnabledYet && multiBuffer) {
qWarning() << "QEglFSImx6Hooks will set environment variable FB_MULTI_BUFFER=2 to enable double buffering and vsync.\n"
<< "If this is not desired, you can override this via: export QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER=1";
qputenv("FB_MULTI_BUFFER", "2");
}
mNativeDisplay = fbGetDisplayByIndex(0);
fbGetDisplayGeometry(mNativeDisplay, &width, &height);
mScreenSize.setHeight(height);