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/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "calcboundingvolumejob_p.h"
#include <Qt3DRender/private/renderer_p.h>
#include <Qt3DRender/private/entity_p.h>
#include <Qt3DRender/private/renderlogging_p.h>
#include <Qt3DRender/private/managers_p.h>
#include <Qt3DRender/private/geometryrenderer_p.h>
#include <Qt3DRender/private/geometry_p.h>
#include <Qt3DRender/private/buffermanager_p.h>
#include <Qt3DRender/private/attribute_p.h>
#include <Qt3DRender/private/buffer_p.h>
#include <Qt3DRender/private/sphere_p.h>
#include <Qt3DCore/qaxisalignedboundingbox.h>
#include <QtCore/qmath.h>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
namespace {
void calculateLocalBoundingVolume(Renderer *renderer, Entity *node)
{
// TO DO: How do we set the object picker to dirty when the buffer
// referenced by the pickVolumeAttribute changes or has its internal buffer
// data changed
GeometryRenderer *gRenderer = node->renderComponent<GeometryRenderer>();
if (gRenderer) {
Geometry *geom = renderer->geometryManager()->lookupResource(gRenderer->geometryId());
// TO DO: We must not recompute this every frame
// Find a way to detect that the bounding volume attribute or its buffer have changed
if (geom) {
Qt3DRender::Render::Attribute *pickVolumeAttribute = renderer->attributeManager()->lookupResource(geom->boundingPositionAttribute());
// Use the default position attribute if attribute is null
if (!pickVolumeAttribute) {
Q_FOREACH (const Qt3DCore::QNodeId attrId, geom->attributes()) {
pickVolumeAttribute = renderer->attributeManager()->lookupResource(attrId);
if (pickVolumeAttribute &&
pickVolumeAttribute->name() == QAttribute::defaultPositionAttributeName())
break;
}
}
if (pickVolumeAttribute) {
if (!pickVolumeAttribute
|| pickVolumeAttribute->attributeType() != Qt3DCore::QAbstractAttribute::VertexAttribute
|| pickVolumeAttribute->dataType() != Qt3DCore::QAbstractAttribute::Float
|| pickVolumeAttribute->dataSize() < 3) {
qWarning() << "QBoundingVolumeSpecifier pickVolume Attribute not suited for bounding volume computation";
return;
}
Buffer *buf = renderer->bufferManager()->lookupResource(pickVolumeAttribute->bufferId());
// No point in continuing if the positionAttribute doesn't have a suitable buffer
if (!buf) {
qWarning() << "ObjectPicker pickVolume Attribute not referencing a valid buffer";
return;
}
Qt3DCore::QAxisAlignedBoundingBox bbox;
const QByteArray buffer = buf->data();
const char *rawBuffer = buffer.constData();
rawBuffer += pickVolumeAttribute->byteOffset();
const int stride = pickVolumeAttribute->byteStride() ? pickVolumeAttribute->byteStride() : sizeof(float) * pickVolumeAttribute->dataSize();
QVector<QVector3D> vertices(pickVolumeAttribute->count());
// TO DO: We don't need to create a vector of QVector3D
// to build bbox used to then build a sphere, we could build the sphere
// by just looking at the vertices using more efficient algorithms (EPOS, Ritters)
for (int c = 0, vC = vertices.size(); c < vC; ++c) {
QVector3D v;
const float *fptr = reinterpret_cast<const float*>(rawBuffer);
for (uint i = 0, m = qMin(pickVolumeAttribute->dataSize(), 3U); i < m; ++i)
v[i] = fptr[i];
vertices[c] = v;
rawBuffer += stride;
}
//Phase 1
bbox.update(vertices);
//Phase 2
node->localBoundingVolume()->setCenter(bbox.center());
node->localBoundingVolume()->setRadius(bbox.maxExtent() * 0.5f);
}
}
}
Q_FOREACH (Entity *child, node->children())
calculateLocalBoundingVolume(renderer, child);
}
} // anonymous
CalculateBoundingVolumeJob::CalculateBoundingVolumeJob(Renderer *renderer)
: m_renderer(renderer),
m_node(Q_NULLPTR)
{
}
void CalculateBoundingVolumeJob::run()
{
calculateLocalBoundingVolume(m_renderer, m_node);
}
void CalculateBoundingVolumeJob::setRoot(Entity *node)
{
m_node = node;
}
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
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