QML，Qt4.8:如何同时启用openGl和Chromeless？

Question

下面是我的主要内容

#include <QtGui/QApplication>
#include <QtOpenGL>
#include <QDeclarativeView>
#include <QDeclarativeEngine>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    // Depending on which is the recommended way for the platform, either use
    // opengl graphics system or paint into QGLWidget.
    #ifdef SHADEREFFECTS_USE_OPENGL_GRAPHICSSYSTEM
        QApplication::setGraphicsSystem("opengl");
    #endif

        QApplication a(argc, argv);

    #ifndef SHADEREFFECTS_USE_OPENGL_GRAPHICSSYSTEM
        QGLFormat format = QGLFormat::defaultFormat();
        format.setSampleBuffers(false);
        format.setSwapInterval(1);
        QGLWidget* glWidget = new QGLWidget(format);
        glWidget->setAutoFillBackground(false);
    #endif

        MainWindow w(glWidget);
    w.show();

    return a.exec();
}

和我用来打开QML的文件

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    setAttribute(Qt::WA_OpaquePaintEvent);
    setAttribute(Qt::WA_NoSystemBackground);
  setAttribute(Qt::WA_TranslucentBackground);
  setStyleSheet("background:transparent;");
  qmlRegisterType<QGraphicsBlurEffect>("Effects",1,0,"Blur");
  /* turn off window decorations */
  setWindowFlags(Qt::FramelessWindowHint);



  ui = new QDeclarativeView;
  ui->setSource(QUrl("qrc:/assets/ui.qml"));

 // ui->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);


  setCentralWidget(ui);
}

MainWindow::~MainWindow()
{
    delete ui;
}

和

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtDeclarative>
#include <QtDeclarative/QDeclarativeView>

namespace Ui {
    class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    QDeclarativeView *ui;
};

#endif // MAINWINDOW_H

我尝试启用Open GL，但我什么也看不到，当我在main中注释行时，在我看来，我看到了我的CHROMELESS窗口

Qml debugging is enabled. Only use this in a safe environment!
ShaderEffectItem::paint - OpenGL not available 

我做错了什么？

Answer 1

根据这个：http://qt-project.org/faq/answer/opengl_and_translucent_background_do_not_work_together_due_to_a_limitation

这似乎是不可能的。