qgsoffscreen3dengine.h

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/***************************************************************************
  qgsoffscreen3dengine.h
  --------------------------------------
  Date                 : July 2018
  Copyright            : (C) 2018 by Martin Dobias
  Email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSOFFSCREEN3DENGINE_H
#define QGSOFFSCREEN3DENGINE_H
 
#include "qgsabstract3dengine.h"
 
#include <QSize>
 
class QOffscreenSurface;
 
namespace Qt3DCore
{
  class QAspectEngine;
  class QNode;
}
 
namespace Qt3DRender
{
  class QCameraSelector;
  class QClearBuffers;
  class QRenderAspect;
  class QRenderCapture;
  class QRenderCaptureReply;
  class QRenderTarget;
  class QRenderTargetSelector;
  class QRenderTargetOutput;
  class QRenderSurfaceSelector;
  class QTexture2D;
  class QViewport;
}
 
namespace Qt3DLogic
{
  class QLogicAspect;
}
 
#define SIP_NO_FILE
 
class _3D_EXPORT QgsOffscreen3DEngine : public QgsAbstract3DEngine
{
    Q_OBJECT
  public:
    QgsOffscreen3DEngine();
    ~QgsOffscreen3DEngine() override;
 
    void setSize( QSize s );
 
    void setClearColor( const QColor &color ) override;
    void setFrustumCullingEnabled( bool enabled ) override;
    void setRootEntity( Qt3DCore::QEntity *root ) override;
 
    Qt3DRender::QRenderSettings *renderSettings() override;
    Qt3DRender::QCamera *camera() override;
    QSize size() const override;
    QSurface *surface() const override;
 
    void requestCaptureImage() override;
 
  private:
    void createRenderTarget();
    void createFrameGraph();
 
  private:
 
    QSize mSize = QSize( 640, 480 );
    Qt3DRender::QCamera *mCamera = nullptr;
    QOffscreenSurface *mOffscreenSurface = nullptr;
    Qt3DRender::QRenderCaptureReply *mReply = nullptr;
 
    // basic Qt3D stuff
    Qt3DCore::QAspectEngine *mAspectEngine = nullptr;              // The aspect engine, which holds the scene and related aspects.
    Qt3DRender::QRenderAspect *mRenderAspect = nullptr;            // The render aspect, which deals with rendering the scene.
    Qt3DLogic::QLogicAspect *mLogicAspect = nullptr;               // The logic aspect, which runs jobs to do with synchronising frames.
    Qt3DRender::QRenderSettings *mRenderSettings = nullptr;        // The render settings, which control the general rendering behavior.
    Qt3DCore::QNode *mSceneRoot = nullptr;                         // The scene root, which becomes a child of the engine's root entity.
    Qt3DCore::QEntity *mRoot = nullptr;
 
    // render target stuff
    Qt3DRender::QRenderTarget *mTextureTarget = nullptr;
    Qt3DRender::QRenderTargetOutput *mTextureOutput = nullptr;
    Qt3DRender::QTexture2D *mTexture = nullptr;
    Qt3DRender::QRenderTargetOutput *mDepthTextureOutput = nullptr;
    Qt3DRender::QTexture2D *mDepthTexture = nullptr;
 
    // frame graph stuff
    Qt3DRender::QRenderSurfaceSelector *mSurfaceSelector = nullptr;
    Qt3DRender::QRenderTargetSelector *mRenderTargetSelector = nullptr;
    Qt3DRender::QViewport *mViewport = nullptr;
    Qt3DRender::QClearBuffers *mClearBuffers = nullptr;
    Qt3DRender::QCameraSelector *mCameraSelector = nullptr;
    Qt3DRender::QRenderCapture *mRenderCapture = nullptr;          // The render capture node, which is appended to the frame graph.
 
};
 
#endif // QGSOFFSCREEN3DENGINE_H