qgsbloomrenderview.h

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/***************************************************************************
  qgsbloomrenderview.h
  --------------------------------------
  Date                 : May 2026
  Copyright            : (C) 2026 by Nyall Dawson
  Email                : nyall dot dawson 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 QGSBLOOMRENDERVIEW_H
#define QGSBLOOMRENDERVIEW_H
 
#include "qgsabstractrenderview.h"
 
#include <QSize>
 
#define SIP_NO_FILE
 
class QgsRenderPassQuad;
 
namespace Qt3DCore
{
  class QEntity;
} //namespace Qt3DCore
 
namespace Qt3DRender
{
  class QTexture2D;
  class QRenderStateSet;
  class QParameter;
} //namespace Qt3DRender
 
class QgsBloomDownsampleEntity;
class QgsBloomUpsampleEntity;

class QgsBloomRenderView : public QgsAbstractRenderView
{
  public:
    QgsBloomRenderView( const QString &viewName, Qt3DRender::QTexture2D *sourceColorTexture, const QSize &size, Qt3DCore::QEntity *rootSceneEntity );
    ~QgsBloomRenderView() override;

    Qt3DRender::QTexture2D *bloomTexture() const;

    void setFilterRadius( float radius );

    void setAspectRatio( float ratio );
 
    void updateWindowResize( int width, int height ) override;
    void setEnabled( bool enabled ) override;
 
  private:
    void buildRenderPasses( Qt3DRender::QTexture2D *sourceTexture, Qt3DCore::QEntity *rootEntity );
 
    // from https://learnopengl.com/Guest-Articles/2022/Phys.-Based-Bloom
    // "You may go as small as you wish, though 5 or 6 is usually good enough" (Jorge Jimenez)
    static const int MIP_PASSES = 5;
 
    QSize mBaseSize;
 
    std::vector<Qt3DRender::QTexture2D *> mTextures;
 
    Qt3DRender::QParameter *mFilterRadiusParameter = nullptr;
    Qt3DRender::QParameter *mAspectRatioParameter = nullptr;
};
 
#endif // QGSBLOOMRENDERVIEW_H