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qgsdemterraintileloader_p.cpp
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qgsdemterraintileloader_p.cpp
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/***************************************************************************
qgsdemterraintileloader_p.cpp
--------------------------------------
Date : July 2017
Copyright : (C) 2017 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. *
* *
***************************************************************************/
#include "qgsdemterraintileloader_p.h"
#include "qgs3dmapsettings.h"
#include "qgschunknode_p.h"
#include "qgsdemterraingenerator.h"
#include "qgsdemterraintilegeometry_p.h"
#include "qgseventtracing.h"
#include "qgsonlineterraingenerator.h"
#include "qgsterrainentity_p.h"
#include "qgsterraintexturegenerator_p.h"
#include "qgsterraintileentity_p.h"
#include "qgsterraingenerator.h"
#include <Qt3DRender/QGeometryRenderer>
#include <QMutexLocker>
///@cond PRIVATE
static void _heightMapMinMax( const QByteArray &heightMap, float &zMin, float &zMax )
{
const float *zBits = ( const float * ) heightMap.constData();
int zCount = heightMap.count() / sizeof( float );
bool first = true;
zMin = zMax = std::numeric_limits<float>::quiet_NaN();
for ( int i = 0; i < zCount; ++i )
{
float z = zBits[i];
if ( std::isnan( z ) )
continue;
if ( first )
{
zMin = zMax = z;
first = false;
}
zMin = std::min( zMin, z );
zMax = std::max( zMax, z );
}
}
QgsDemTerrainTileLoader::QgsDemTerrainTileLoader( QgsTerrainEntity *terrain, QgsChunkNode *node, QgsTerrainGenerator *terrainGenerator )
: QgsTerrainTileLoader( terrain, node )
, mResolution( 0 )
{
QgsDemHeightMapGenerator *heightMapGenerator = nullptr;
if ( terrainGenerator->type() == QgsTerrainGenerator::Dem )
{
QgsDemTerrainGenerator *generator = static_cast<QgsDemTerrainGenerator *>( terrainGenerator );
heightMapGenerator = generator->heightMapGenerator();
mSkirtHeight = generator->skirtHeight();
}
else if ( terrainGenerator->type() == QgsTerrainGenerator::Online )
{
QgsOnlineTerrainGenerator *generator = static_cast<QgsOnlineTerrainGenerator *>( terrainGenerator );
heightMapGenerator = generator->heightMapGenerator();
mSkirtHeight = generator->skirtHeight();
}
else
Q_ASSERT( false );
// get heightmap asynchronously
connect( heightMapGenerator, &QgsDemHeightMapGenerator::heightMapReady, this, &QgsDemTerrainTileLoader::onHeightMapReady );
mHeightMapJobId = heightMapGenerator->render( node->tileId() );
mResolution = heightMapGenerator->resolution();
}
Qt3DCore::QEntity *QgsDemTerrainTileLoader::createEntity( Qt3DCore::QEntity *parent )
{
float zMin, zMax;
_heightMapMinMax( mHeightMap, zMin, zMax );
if ( std::isnan( zMin ) || std::isnan( zMax ) )
{
// no data available for this tile
return nullptr;
}
const Qgs3DMapSettings &map = terrain()->map3D();
QgsChunkNodeId nodeId = mNode->tileId();
QgsRectangle extent = map.terrainGenerator()->tilingScheme().tileToExtent( nodeId.x, nodeId.y, nodeId.z );
double x0 = extent.xMinimum() - map.origin().x();
double y0 = extent.yMinimum() - map.origin().y();
double side = extent.width();
double half = side / 2;
QgsTerrainTileEntity *entity = new QgsTerrainTileEntity( nodeId );
// create geometry renderer
Qt3DRender::QGeometryRenderer *mesh = new Qt3DRender::QGeometryRenderer;
mesh->setGeometry( new DemTerrainTileGeometry( mResolution, side, map.terrainVerticalScale(), mSkirtHeight, mHeightMap, mesh ) );
entity->addComponent( mesh ); // takes ownership if the component has no parent
// create material
createTextureComponent( entity, map.isTerrainShadingEnabled(), map.terrainShadingMaterial(), !map.terrainLayers().empty() );
// create transform
Qt3DCore::QTransform *transform = nullptr;
transform = new Qt3DCore::QTransform();
entity->addComponent( transform );
transform->setScale( side );
transform->setTranslation( QVector3D( x0 + half, 0, - ( y0 + half ) ) );
mNode->setExactBbox( QgsAABB( x0, zMin * map.terrainVerticalScale(), -y0, x0 + side, zMax * map.terrainVerticalScale(), -( y0 + side ) ) );
entity->setEnabled( false );
entity->setParent( parent );
return entity;
}
void QgsDemTerrainTileLoader::onHeightMapReady( int jobId, const QByteArray &heightMap )
{
if ( mHeightMapJobId == jobId )
{
this->mHeightMap = heightMap;
mHeightMapJobId = -1;
// continue loading - texture
loadTexture();
}
}
// ---------------------
#include <qgsrasterlayer.h>
#include <qgsrasterprojector.h>
#include <QtConcurrent/QtConcurrentRun>
#include <QFutureWatcher>
#include "qgsterraindownloader.h"
QgsDemHeightMapGenerator::QgsDemHeightMapGenerator( QgsRasterLayer *dtm, const QgsTilingScheme &tilingScheme, int resolution, const QgsCoordinateTransformContext &transformContext )
: mDtm( dtm )
, mClonedProvider( dtm ? ( QgsRasterDataProvider * )dtm->dataProvider()->clone() : nullptr )
, mTilingScheme( tilingScheme )
, mResolution( resolution )
, mLastJobId( 0 )
, mDownloader( dtm ? nullptr : new QgsTerrainDownloader( transformContext ) )
{
}
QgsDemHeightMapGenerator::~QgsDemHeightMapGenerator()
{
delete mClonedProvider;
}
static QByteArray _readDtmData( QgsRasterDataProvider *provider, const QgsRectangle &extent, int res, const QgsCoordinateReferenceSystem &destCrs )
{
QgsEventTracing::ScopedEvent e( QStringLiteral( "3D" ), QStringLiteral( "DEM" ) );
// TODO: use feedback object? (but GDAL currently does not support cancellation anyway)
QgsRasterInterface *input = provider;
std::unique_ptr<QgsRasterProjector> projector;
if ( provider->crs() != destCrs )
{
projector.reset( new QgsRasterProjector );
projector->setCrs( provider->crs(), destCrs, provider->transformContext() );
projector->setInput( provider );
input = projector.get();
}
std::unique_ptr< QgsRasterBlock > block( input->block( 1, extent, res, res ) );
QByteArray data;
if ( block )
{
block->convert( Qgis::Float32 ); // currently we expect just floats
data = block->data();
data.detach(); // this should make a deep copy
if ( block->hasNoData() )
{
// turn all no-data values into NaN in the output array
float *floatData = reinterpret_cast<float *>( data.data() );
Q_ASSERT( data.count() % sizeof( float ) == 0 );
int count = data.count() / sizeof( float );
for ( int i = 0; i < count; ++i )
{
if ( block->isNoData( i ) )
floatData[i] = std::numeric_limits<float>::quiet_NaN();
}
}
}
return data;
}
static QByteArray _readOnlineDtm( QgsTerrainDownloader *downloader, const QgsRectangle &extent, int res, const QgsCoordinateReferenceSystem &destCrs )
{
return downloader->getHeightMap( extent, res, destCrs );
}
int QgsDemHeightMapGenerator::render( const QgsChunkNodeId &nodeId )
{
QgsEventTracing::addEvent( QgsEventTracing::AsyncBegin, QStringLiteral( "3D" ), QStringLiteral( "DEM" ), nodeId.text() );
// extend the rect by half-pixel on each side? to get the values in "corners"
QgsRectangle extent = mTilingScheme.tileToExtent( nodeId.x, nodeId.y, nodeId.z );
float mapUnitsPerPixel = extent.width() / mResolution;
extent.grow( mapUnitsPerPixel / 2 );
// but make sure not to go beyond the full extent (returns invalid values)
QgsRectangle fullExtent = mTilingScheme.tileToExtent( 0, 0, 0 );
extent = extent.intersect( fullExtent );
JobData jd;
jd.jobId = ++mLastJobId;
jd.tileId = nodeId;
jd.extent = extent;
jd.timer.start();
// make a clone of the data provider so it is safe to use in worker thread
if ( mDtm )
jd.future = QtConcurrent::run( _readDtmData, mClonedProvider, extent, mResolution, mTilingScheme.crs() );
else
jd.future = QtConcurrent::run( _readOnlineDtm, mDownloader.get(), extent, mResolution, mTilingScheme.crs() );
QFutureWatcher<QByteArray> *fw = new QFutureWatcher<QByteArray>( nullptr );
fw->setFuture( jd.future );
connect( fw, &QFutureWatcher<QByteArray>::finished, this, &QgsDemHeightMapGenerator::onFutureFinished );
connect( fw, &QFutureWatcher<QByteArray>::finished, fw, &QObject::deleteLater );
mJobs.insert( fw, jd );
return jd.jobId;
}
void QgsDemHeightMapGenerator::waitForFinished()
{
for ( QFutureWatcher<QByteArray> *fw : mJobs.keys() )
{
disconnect( fw, &QFutureWatcher<QByteArray>::finished, this, &QgsDemHeightMapGenerator::onFutureFinished );
disconnect( fw, &QFutureWatcher<QByteArray>::finished, fw, &QObject::deleteLater );
}
QVector<QFutureWatcher<QByteArray>*> toBeDeleted;
for ( QFutureWatcher<QByteArray> *fw : mJobs.keys() )
{
fw->waitForFinished();
JobData jobData = mJobs.value( fw );
toBeDeleted.push_back( fw );
QByteArray data = jobData.future.result();
emit heightMapReady( jobData.jobId, data );
}
for ( QFutureWatcher<QByteArray> *fw : toBeDeleted )
{
mJobs.remove( fw );
fw->deleteLater();
}
}
void QgsDemHeightMapGenerator::lazyLoadDtmCoarseData( int res, const QgsRectangle &rect )
{
QMutexLocker locker( &mLazyLoadDtmCoarseDataMutex );
if ( mDtmCoarseData.isEmpty() )
{
std::unique_ptr< QgsRasterBlock > block( mDtm->dataProvider()->block( 1, rect, res, res ) );
block->convert( Qgis::Float32 );
mDtmCoarseData = block->data();
mDtmCoarseData.detach(); // make a deep copy
}
}
float QgsDemHeightMapGenerator::heightAt( double x, double y )
{
if ( !mDtm )
return 0; // TODO: calculate heights for online DTM
// TODO: this is quite a primitive implementation: better to use heightmaps currently in use
int res = 1024;
QgsRectangle rect = mDtm->extent();
lazyLoadDtmCoarseData( res, rect );
int cellX = ( int )( ( x - rect.xMinimum() ) / rect.width() * res + .5f );
int cellY = ( int )( ( rect.yMaximum() - y ) / rect.height() * res + .5f );
cellX = qBound( 0, cellX, res - 1 );
cellY = qBound( 0, cellY, res - 1 );
const float *data = ( const float * ) mDtmCoarseData.constData();
return data[cellX + cellY * res];
}
void QgsDemHeightMapGenerator::onFutureFinished()
{
QFutureWatcher<QByteArray> *fw = static_cast<QFutureWatcher<QByteArray>*>( sender() );
Q_ASSERT( fw );
Q_ASSERT( mJobs.contains( fw ) );
JobData jobData = mJobs.value( fw );
mJobs.remove( fw );
fw->deleteLater();
QgsEventTracing::addEvent( QgsEventTracing::AsyncEnd, QStringLiteral( "3D" ), QStringLiteral( "DEM" ), jobData.tileId.text() );
QByteArray data = jobData.future.result();
emit heightMapReady( jobData.jobId, data );
}
/// @endcond