qgsforwardrenderview.h

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/***************************************************************************
  qgsforwardrenderview.h
  --------------------------------------
  Date                 : June 2024
  Copyright            : (C) 2024 by Benoit De Mezzo and (C) 2020 by Belgacem Nedjima
  Email                : benoit dot de dot mezzo at oslandia 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 QGSFORWARDRENDERVIEW_H
#define QGSFORWARDRENDERVIEW_H
 
#include "qgsabstractrenderview.h"
 
#define SIP_NO_FILE
 
namespace Qt3DRender
{
  class QRenderSettings;
  class QLayer;
  class QSubtreeEnabler;
  class QTexture2D;
  class QCamera;
  class QCameraSelector;
  class QLayerFilter;
  class QRenderTargetSelector;
  class QRenderTarget;
  class QClearBuffers;
  class QFrustumCulling;
  class QMultiSampleAntiAliasing;
  class QRenderStateSet;
  class QTexture2DMultisample;
  class QDebugOverlay;
} // namespace Qt3DRender
 

class QgsForwardRenderView : public QgsAbstractRenderView
{
  public:
    QgsForwardRenderView( const QString &viewName, Qt3DRender::QCamera *mainCamera );

    Qt3DRender::QLayer *renderLayer() { return mRenderLayer; }

    Qt3DRender::QLayer *transparentObjectLayer() { return mTransparentObjectsLayer; }

    Qt3DRender::QLayer *backgroundLayer() { return mBackgroundLayer; }

    void setClearColor( const QColor &clearColor );

    bool isFrustumCullingEnabled() const { return mFrustumCullingEnabled; }
    void setFrustumCullingEnabled( bool enabled );

    void setDebugOverlayEnabled( bool enabled );

    void setMsaaEnabled( bool enabled );

    Qt3DRender::QRenderTargetSelector *renderTargetSelector() { return mRenderTargetSelector; }

    Qt3DRender::QRenderTarget *regularRenderTarget() const { return mRegularRenderTarget; }

    Qt3DRender::QRenderTarget *msaaRenderTarget() const { return mMsaaRenderTarget; }
 
    void updateWindowResize( int width, int height ) override;

    Qt3DRender::QTexture2D *depthTexture() const;

    Qt3DRender::QTexture2D *colorTexture() const;

    void addClipPlanes( int nrClipPlanes );

    void removeClipPlanes();
 
  private:
    Qt3DRender::QCamera *mMainCamera = nullptr;
 
    Qt3DRender::QCameraSelector *mMainCameraSelector = nullptr;
    Qt3DRender::QLayerFilter *mLayerFilter = nullptr;
    Qt3DRender::QRenderTargetSelector *mRenderTargetSelector = nullptr;
 
    // clip planes render state
    Qt3DRender::QRenderStateSet *mClipRenderStateSet = nullptr;
 
    Qt3DRender::QLayer *mRenderLayer = nullptr;
    Qt3DRender::QLayer *mTransparentObjectsLayer = nullptr;
    Qt3DRender::QLayer *mBackgroundLayer = nullptr;
    Qt3DRender::QClearBuffers *mClearBuffers = nullptr;
    bool mFrustumCullingEnabled = true;
    Qt3DRender::QFrustumCulling *mFrustumCulling = nullptr;
    // Forward rendering pass texture related objects:
    Qt3DRender::QTexture2D *mColorTexture = nullptr;
    Qt3DRender::QTexture2D *mDepthTexture = nullptr;
    // QDebugOverlay added in the forward pass
    Qt3DRender::QDebugOverlay *mDebugOverlay = nullptr;
    // MSAA
    Qt3DRender::QMultiSampleAntiAliasing *mMsaaRenderState = nullptr;
    Qt3DRender::QRenderTarget *mRegularRenderTarget = nullptr;
    Qt3DRender::QRenderTarget *mMsaaRenderTarget = nullptr;
    Qt3DRender::QTexture2DMultisample *mColorTextureMS = nullptr;
    Qt3DRender::QTexture2DMultisample *mDepthTextureMS = nullptr;
 
    int mCurrentWidth = 0;
    int mCurrentHeight = 0;

    void buildRenderPasses();

    Qt3DRender::QRenderTarget *buildTextures();

    Qt3DRender::QRenderTarget *buildMsaaTarget();
};
 
#endif // QGSFORWARDRENDERVIEW_H