QQuickView crash,is it a bug?

[JohnDaYe]

@koahnig rebuild can not reslove this problem!

[koahnig]

@JohnDaYe

Then you would need to debug and check where it crashes.

You need to give more details as the actual error message. Especially if it is already during start-up or later on is important.

[mrjj]

Hi
Also, i wondering if that qml can work ?
I mean its just rectangle. not a window.

Using

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Rectangle {
        visible: true
        width: 640
        height: 480
        color: "red"
    }
}

Both works in mingw and visual studio for me.

[JohnDaYe]

@mrjj look at my c++ code
i use quickview not xxxengine

[JohnDaYe]

@koahnig Vesion of my Qt is 5.9.5
HEAP[untitled1.exe]: Invalid allocation size - 646f72700000001f (exceeded 7ffffffdefff)
0x00007FFD471DA388 （ untitled1.exe ) Microsoft C++ exception: std::bad_alloc，0x000000DBD48FD2C0 。
0x00007FFD031DBB6B (ig9icd64.dll) (untitled1.exe ): 0xC0000005: read 0xFFFFFFFFFFFFFFFF 。
0x00007FFD031DBB6B (ig9icd64.dll) (untitled1.exe ): 0xC0000005: 0xFFFFFFFFFFFFFFFF 。

stack：

ig9icd64.dll!00007ffd031dbb6b()
ig9icd64.dll!00007ffd031dc670()
ig9icd64.dll!00007ffd031dde9a()
ig9icd64.dll!00007ffd031d888f()
ig9icd64.dll!00007ffd02d74bb0()
ig9icd64.dll!00007ffd02ec87d2()
ig9icd64.dll!00007ffd02e6edf0()
untitled1.exe!QOpenGLExtraFunctions::glProgramBinary(unsigned int program, unsigned int binaryFormat, const void * binary, int length) 1177 C++

[mrjj]

@JohnDaYe
Ah, yes. tried your sample.
It work fine here.

I dont have vs 2017 so cant test if that makes a difference.

here is complete test sample if anyone can see if reproducible with 2017
https://www.dropbox.com/s/1mul34tc2ed8qij/qmltest.zip?dl=0

[JohnDaYe]

@mrjj thanks！
maybe it is caused by opengl driver！ god knows。

[mrjj]

@JohnDaYe
Well it looks a bit like that
ig9icd64 is as far as i know intel graphics driver.

What spooks me is that mingw should use same driver but it could be some
incompatibilities with vs run time and the driver.
it gives bad_alloc.

You could go see if newer driver is available from their site.
(if you indeed has Intel gfx:)

Also it sort of sounds like this bug
https://bugreports.qt.io/browse/QTBUG-66915

[JohnDaYe]

@mrjj yes，I update my intel driver(old driver is from microsoft with Win10)，everything is be ok! but i can not let my customer to do this!
Is there a way that let QQuickview use Direct3D?

[JohnDaYe]

@mrjj mingw is ok in the same environment!emm

[mrjj]

Direct3D

Well there is https://doc-snapshots.qt.io/qt5-5.9/qtquick-visualcanvas-adaptations-d3d12.html
but dont know how well it works.

Im not sure there is other fix than new drivers.
seems to be certain version of intel gfx
https://bugreports.qt.io/browse/QTBUG-64697

[Shadow Won]

@JohnDaYe Maybe you can explicitly set the scenegraph backend to Direct3D, just add

QQuickWindow::setSceneGraphBackend(QSGRendererInterface::Direct3D12);

before any QQuickWindow is created