qgsdepthrenderview.cpp

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/***************************************************************************
  qgsdepthrenderview.cpp
  --------------------------------------
  Date                 : August 2022
  Copyright            : (C) 2022 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsdepthrenderview.h"
 
#include "qgsdepthentity.h"
 
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QCameraSelector>
#include <Qt3DRender/QClearBuffers>
#include <Qt3DRender/QCullFace>
#include <Qt3DRender/QDepthTest>
#include <Qt3DRender/QLayer>
#include <Qt3DRender/QLayerFilter>
#include <Qt3DRender/QRenderCapture>
#include <Qt3DRender/QRenderStateSet>
#include <Qt3DRender/QRenderTarget>
#include <Qt3DRender/QRenderTargetSelector>
#include <Qt3DRender/QTexture>
#include <Qt3DRender/qsubtreeenabler.h>
 
QgsDepthRenderView::QgsDepthRenderView( const QString &viewName, QSize size, Qt3DRender::QTexture2D *forwardDepthTexture, Qt3DCore::QEntity *rootSceneEntity )
  : QgsAbstractRenderView( viewName )
{
  mLayer = new Qt3DRender::QLayer;
  mLayer->setRecursive( true );
  mLayer->setObjectName( mViewName + "::Layer" );
 
  // depth rendering pass
  buildRenderPass( size, forwardDepthTexture, rootSceneEntity );
}
 
void QgsDepthRenderView::updateWindowResize( int width, int height )
{
  mColorTexture->setSize( width, height );
}
 
Qt3DRender::QRenderTarget *QgsDepthRenderView::buildTextures( QSize size )
{
  // depth buffer render to copy pass
  // Create a render target output for rendering color.
  Qt3DRender::QRenderTargetOutput *colorOutput = new Qt3DRender::QRenderTargetOutput;
  colorOutput->setAttachmentPoint( Qt3DRender::QRenderTargetOutput::Color0 );
 
  // Create a texture to render into.
  mColorTexture = new Qt3DRender::QTexture2D( colorOutput );
  mColorTexture->setSize( size.width(), size.height() );
  mColorTexture->setFormat( Qt3DRender::QAbstractTexture::RGB8_UNorm );
  mColorTexture->setMinificationFilter( Qt3DRender::QAbstractTexture::Linear );
  mColorTexture->setMagnificationFilter( Qt3DRender::QAbstractTexture::Linear );
  mColorTexture->setObjectName( mViewName + "::mColorTexture" );
 
  // Hook the texture up to our output, and the output up to this object.
  colorOutput->setTexture( mColorTexture );
 
  Qt3DRender::QRenderTarget *renderTarget = new Qt3DRender::QRenderTarget;
  renderTarget->setObjectName( mViewName + "::RenderTarget" );
  renderTarget->addOutput( colorOutput );
 
  return renderTarget;
}
 
void QgsDepthRenderView::buildRenderPass( QSize size, Qt3DRender::QTexture2D *forwardDepthTexture, Qt3DCore::QEntity *rootSceneEntity )
{
  // depth buffer render to copy pass
  Qt3DRender::QLayerFilter *layerFilter = new Qt3DRender::QLayerFilter( mRendererEnabler );
  layerFilter->addLayer( mLayer );
 
  Qt3DRender::QRenderTargetSelector *renderTargetSelector = new Qt3DRender::QRenderTargetSelector( layerFilter );
 
  // build texture part
  Qt3DRender::QRenderTarget *renderTarget = buildTextures( size );
 
  renderTargetSelector->setTarget( renderTarget );
 
  // Note: We do not a clear buffers node since we are drawing a quad that will override the buffer's content anyway
  mDepthRenderCapture = new Qt3DRender::QRenderCapture( renderTargetSelector );
 
  // entity used to draw the depth texture and convert it to rgb image
  new QgsDepthEntity( forwardDepthTexture, mLayer, rootSceneEntity );
}