QML C++ application runs much slower than pure QML

longWorm

Hi everyone.

I'm writing small game in qml. When i run it in qmlviewer everything works fine, application uses 10-15% CPU. When i create QtQuick project and run application with QmlApplicationViewer C++ class it runs much slower, there is about 70-80 % CPU usage.

Is it normal? Can i deploy pure QML application?
Can I make package or bin file from my app without writing C++ code?

Thanks everyone.

Chuck Gao

It's weird. Since everything is works properly for me, can you paste your env? Desktop ? Mobile ?

andre

Very strange, because the QML viewer app does not much more than use the same class. Did you try setting a QGLWidget as your viewport widget?

MichK

You may try to use QML Profiler in Qt Creator. It should give you some clue.

longWorm

Thank's everyone for replies!
"Here's the link to my project. Main file is _arca.qml.":http://www.filefactory.com/file/c496a01/n/_arca.rar

I ran it with qmlviewer ("qmlviewer _arca.qml" in terminal)
I made QtQuick project. My main.cpp:
@
#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"

Q_DECL_EXPORT int main(int argc, char *argv[])
{
QScopedPointer<QApplication> app(createApplication(argc, argv));

QmlApplicationViewer viewer;
viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer.setMainQmlFile&#40;QLatin1String("_arca.qml"&#41;);
viewer.showExpanded();
return app->exec&#40;&#41;;

}
@
Now i understood, that it's bad idea to use javascript in C++ application so i'm rewriting all logic in C++.
But the problem wasn't solved.

longWorm

And i forgot to say that its desktop configuration.

I'll try to use QGLWidget and write about results

outdoor_guy

Have you tried
@ QApplication::setGraphicsSystem("raster");@

at the beginning of the main (I would say in Line 7 or so)

For me, this makes the application much faster

longWorm

Yes, i already tried it before, but application is still very slow.
Can somebody give advice how to make an explosion animation?
I tried two variant but both are too slow.

Dynamically create some objects and make them move to different corners of screen
Use Particles qml object (burst method)
[quote author="outdoor_guy" date="1331547299"]Have you tried
@ QApplication::setGraphicsSystem("raster");@

at the beginning of the main (I would say in Line 7 or so)

For me, this makes the application much faster[/quote]