#include <QGuiApplication>
#include <QtWidgets/QApplication>
#include <QtWidgets/QWidget>
#include <QtWidgets/QHBoxLayout>

#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DExtras/QForwardRenderer>

#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QOpenGLWidget>
#include <QPainter>

class MyGLWidget : public QOpenGLWidget, protected QOpenGLFunctions
{
public:
	MyGLWidget(QWidget *parent) : QOpenGLWidget(parent)
	{
	}

protected:
	void initializeGL()
	{
		initializeOpenGLFunctions();
		glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
	}

	void resizeGL(int w, int h)
	{
		glViewport(0, 0, w, h);
	}

	void paintGL()
	{
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		QPainter painter(this);
		painter.setPen(qRgb(0, 0, 0));
		painter.drawText(this->rect(), "TEST", QTextOption(Qt::AlignCenter | Qt::AlignHCenter));
	}

};

int main(int argc, char **argv)
{
	QApplication app(argc, argv);
	app.setAttribute(Qt::AA_ShareOpenGLContexts); // Do we need this?

	QWidget *widget = new QWidget;
	QHBoxLayout *hLayout = new QHBoxLayout(widget);

	//MyGLWidget *myGlWidget = new MyGLWidget(widget); // Showing text.

	Qt3DExtras::Qt3DWindow *view = new Qt3DExtras::Qt3DWindow();

	MyGLWidget *myGlWidget = new MyGLWidget(widget); // Not showing text. We need to create MyGLWidget at the runtime. QGLWidget works fine. 

	view->defaultFrameGraph()->setClearColor(QColor(QRgb(0x4d4d4f)));
	QWidget *container = QWidget::createWindowContainer(view);
	hLayout->addWidget(myGlWidget, 1);
	hLayout->addWidget(container, 2);

	widget->show();
	widget->resize(1200, 800);

	return app.exec();
}