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  **
  ** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the Qt3D module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
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  ** packaging of this file. Please review the following information to
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  ****************************************************************************/
  
  #ifndef QT3DRENDER_QRAYCASTINGSERVICE_P_H
  #define QT3DRENDER_QRAYCASTINGSERVICE_P_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists for the convenience
  // of other Qt classes.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include <Qt3DCore/qt3dcore_global.h>
  #include <Qt3DRender/private/qabstractcollisionqueryservice_p.h>
  #include <Qt3DRender/private/qray3d_p.h>
  
  #include <QHash>
  #include <QtConcurrent>
  #include <QAtomicInt>
  
  QT_BEGIN_NAMESPACE
  
  namespace Qt3DRender {
  namespace RayCasting {
  
  class QBoundingVolumeProvider;
  class QRayCastingServicePrivate;
  
  typedef QFuture<QCollisionQueryResult> FutureQueryResult;
  
  class QT3DRENDERSHARED_EXPORT QRayCastingService : public QAbstractCollisionQueryService
  {
  public:
      QRayCastingService();
  
      QQueryHandle query(const QRay3D &ray, QueryMode mode, QBoundingVolumeProvider *provider) override;
      QCollisionQueryResult::Hit query(const QRay3D &ray, const QBoundingVolume *volume) override;
  
      QCollisionQueryResult fetchResult(const QQueryHandle &handle) override;
      QVector<QCollisionQueryResult> fetchAllResults() const override;
  
  protected:
      QRayCastingService(QRayCastingServicePrivate &dd);
  
  private:
      Q_DISABLE_COPY(QRayCastingService)
      Q_DECLARE_PRIVATE(QRayCastingService)
  };
  
  class QRayCastingServicePrivate : public QAbstractCollisionQueryServicePrivate
  {
  public:
      QRayCastingServicePrivate(const QString &description);
  
      QCollisionQueryResult collides(const QRay3D &ray,
                                     QBoundingVolumeProvider *provider,
                                     QAbstractCollisionQueryService::QueryMode mode,
                                     const QQueryHandle &handle);
      QCollisionQueryResult::Hit collides(const QRay3D &ray,
                                          const QBoundingVolume *volume);
  
      Q_DECLARE_PUBLIC(QRayCastingService)
  
      struct Query
      {
          QQueryHandle handle;
          QRay3D ray;
          QRayCastingService::QueryMode mode;
      };
  
  #if QT_CONFIG(concurrent)
      QHash<QQueryHandle, FutureQueryResult> m_results;
  #else
      QHash<QQueryHandle, QCollisionQueryResult> m_results;
  #endif
      QAtomicInt m_handlesCount;
  };
  
  } // namespace RayCasting
  } // namespace Qt3DRender
  
  QT_END_NAMESPACE
  
  #endif // QT3DRENDER_QRAYCASTINGSERVICE_P_H
  