Qt 5.6 | Qt Quick | QQuickRenderControl Example | window_singlethreaded.h Example File

Qt 5.6.2 Reference Documentation

# window_singlethreaded.h Example File

rendercontrol/window_singlethreaded.h

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #ifndef WINDOW_SINGLETHREADED_H
      #define WINDOW_SINGLETHREADED_H

      #include <QWindow>
      #include <QMatrix4x4>
      #include <QTimer>

      QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
      QT_FORWARD_DECLARE_CLASS(QOpenGLFramebufferObject)
      QT_FORWARD_DECLARE_CLASS(QOffscreenSurface)
      QT_FORWARD_DECLARE_CLASS(QQuickRenderControl)
      QT_FORWARD_DECLARE_CLASS(QQuickWindow)
      QT_FORWARD_DECLARE_CLASS(QQmlEngine)
      QT_FORWARD_DECLARE_CLASS(QQmlComponent)
      QT_FORWARD_DECLARE_CLASS(QQuickItem)

      class CubeRenderer;

      class WindowSingleThreaded : public QWindow
      {
          Q_OBJECT

      public:
          WindowSingleThreaded();
          ~WindowSingleThreaded();

      protected:
          void exposeEvent(QExposeEvent *e) Q_DECL_OVERRIDE;
          void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
          void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
          void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;

      private slots:
          void run();

          void createFbo();
          void destroyFbo();
          void render();
          void requestUpdate();
          void handleScreenChange();

      private:
          void startQuick(const QString &filename);
          void updateSizes();
          void resizeFbo();

          QOpenGLContext *m_context;
          QOffscreenSurface *m_offscreenSurface;
          QQuickRenderControl *m_renderControl;
          QQuickWindow *m_quickWindow;
          QQmlEngine *m_qmlEngine;
          QQmlComponent *m_qmlComponent;
          QQuickItem *m_rootItem;
          QOpenGLFramebufferObject *m_fbo;
          bool m_quickInitialized;
          bool m_quickReady;
          QTimer m_updateTimer;
          CubeRenderer *m_cubeRenderer;
          qreal m_dpr;
      };

      #endif