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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "floatingitemnode_sg.h"
#include <QtDeclarative/qsgcontext.h>
QT_BEGIN_NAMESPACE
FloatingItemSGNode::FloatingItemSGNode(QSGContext *context)
: m_stereoInfo(context), m_depth(0.0f)
{
// Preprocessing is required only if the context supports pre-transforms.
if (m_stereoInfo.hasPreTransform())
setFlag(Node::UsePreprocess, true);
}
FloatingItemSGNode::~FloatingItemSGNode()
{
}
void FloatingItemSGNode::setDepth(qreal depth)
{
m_depth = depth;
}
Node::NodeType FloatingItemSGNode::type() const
{
// If the device-specific rendering context does not inherit
// from QSGStereoContext, then it won't be aware of how to
// update pre-transform nodes. In that case, act like a
// regular transform node and ignore the depth adjustment.
if (m_stereoInfo.hasPreTransform())
return PreTransformNodeType;
else
return TransformNodeType;
}
void FloatingItemSGNode::preprocess()
{
QMatrix4x4 adjustMatrix;
QGL::Eye eye = m_stereoInfo.eye();
if (eye != QGL::NoEye && m_depth != 0.0f) {
// Correct the depth value for the screen's DPI. We treat 100 DPI
// as "normal" and scale the depth value accordingly. This way,
// the same number of millimeters are used on all displays viewed
// at the same viewing distance. A depth of 1 is 0.254 millimeters.
// Note: we should probably correct for viewing distance also,
// but that is harder to determine.
qreal depth = m_depth * m_stereoInfo.context()->glContext()->device()->logicalDpiX() / 100.0f;
// Determine the transformation to pre-multiply with the modelview.
if (eye == QGL::LeftEye)
adjustMatrix.translate(depth / 2.0f, 0.0f, 0.0f);
else
adjustMatrix.translate(-depth / 2.0f, 0.0f, 0.0f);
}
setPreMatrix(adjustMatrix);
}
QT_END_NAMESPACE
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