main.cpp Example File

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  #include <QtCore/QThread>

  #include <QGuiApplication>

  #include <QtGui/private/qguiapplication_p.h>
  #include <QtGui/qpa/qplatformintegration.h>

  #include <QtQuick/QQuickView>

  #include "threadrenderer.h"

  int main(int argc, char **argv)
  {
      QGuiApplication app(argc, argv);

      if (!QGuiApplicationPrivate::platform_integration->hasCapability(QPlatformIntegration::ThreadedOpenGL)) {
          QQuickView view;
          view.setSource(QUrl("qrc:///scenegraph/textureinthread/error.qml"));
          view.show();
          return app.exec();
      }

      qmlRegisterType<ThreadRenderer>("SceneGraphRendering", 1, 0, "Renderer");
      int execReturn = 0;

      {
          QQuickView view;

          // Rendering in a thread introduces a slightly more complicated cleanup
          // so we ensure that no cleanup of graphics resources happen until the
          // application is shutting down.
          view.setPersistentOpenGLContext(true);
          view.setPersistentSceneGraph(true);

          view.setResizeMode(QQuickView::SizeRootObjectToView);
          view.setSource(QUrl("qrc:///scenegraph/textureinthread/main.qml"));
          view.show();

          execReturn = app.exec();
      }

      // As the render threads make use of our QGuiApplication object
      // to clean up gracefully, wait for them to finish before
      // QGuiApp is taken off the heap.
      for (QThread *t : qAsConst(ThreadRenderer::threads)) {
          t->wait();
          delete t;
      }

      return execReturn;
  }