QtQuick applications creates two Open GL Render Contexts on my machine. It seems that Qt first fails to create a context. It then creates a new context which then is used by the application. The application seems to work as intended. But is this behaviour intended or is it a Qt-bug or an indication that something is wrong with my setup? Take the template QtQuick 2 application as an example:
main.cpp
#include <QGuiApplication>
#include <QQmlApplicationEngine>
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
return app.exec();
}
main.qml
import QtQuick 2.2
import QtQuick.Window 2.1
Window {
visible: true
width: 360
height: 360
MouseArea {
anchors.fill: parent
onClicked: {
Qt.quit();
}
}
Text {
text: qsTr("Hello World")
anchors.centerIn: parent
}
}
This application (standard debug build) show two Open GL contexts when debugged with gDEBugger. The info that gDEBugger gives is a little different for the two contexts. Context 1 has Pixel Format ID 4, not Double Buffered and Stencil Channel 0 while Context 2 has Pixel Format ID 12, is Double Buffered and Stencil Channel 8. Otherwise the info is the same for both contexts.
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