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/****************************************************************************
**
** Copyright (C) 2011 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 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 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qglattributeset.h"
QT_BEGIN_NAMESPACE
/*!
\class QGLAttributeSet
\brief The QGLAttributeSet class provides a set of QGL::VertexAttribute indexes.
\since 4.8
\ingroup qt3d
\ingroup qt3d::arrays
QGLAttributeSet is intended for checking if a specific vertex
attribute is present in a piece of geometry, or has been set on a
QGLPainter during rendering operations. The members of the set
are instances of QGL::VertexAttribute, with the restriction that
the index must be between 0 and 31.
The most common use for this class is to determine if specific
attributes have been supplied on a QGLPainter so as to adjust the
current drawing effect accordingly. The following example will
use a lit texture effect if texture co-ordinates were provided
in the vertex bundle, or a simple lit material effect if
texture co-ordinates were not provided:
\code
painter.clearAttributes();
painter.setVertexBundle(bundle);
if (painter.attributes().contains(QGL::TextureCoord0))
painter.setStandardEffect(QGL::LitModulateTexture2D);
else
painter.setStandardEffect(QGL::LitMaterial);
\endcode
It is important to clear the attributes before setting the vertex
bundle, so that attributes from a previous bundle will not leak
through. Multiple vertex bundles may be supplied if they contain
different parts of the same logical piece of geometry.
\sa QGLVertexBundle::attributes(), QGLPainter::attributes()
*/
/*!
\fn QGLAttributeSet::QGLAttributeSet()
Constructs an empty attribute set.
\sa isEmpty()
*/
/*!
\fn bool QGLAttributeSet::isEmpty() const
Returns true if this attribute set is empty; false otherwise.
*/
/*!
\fn void QGLAttributeSet::clear()
Clears this attribute set to empty.
*/
/*!
\fn bool QGLAttributeSet::contains(QGL::VertexAttribute attr) const
Returns true if this attribute set contains \a attr; false otherwise.
\sa insert(), remove()
*/
/*!
\fn void QGLAttributeSet::insert(QGL::VertexAttribute attr)
Inserts \a attr into this attribute set. Note: \a attr must be
within the range 0 to 31. Attribute indexes outside this range
are ignored and not added to the set.
\sa remove(), contains()
*/
/*!
\fn void QGLAttributeSet::remove(QGL::VertexAttribute attr)
Removes \a attr from this attribute set.
\sa insert(), contains()
*/
/*!
Returns the members of this attribute set as a list.
\sa fromList()
*/
QList<QGL::VertexAttribute> QGLAttributeSet::toList() const
{
QList<QGL::VertexAttribute> list;
quint32 attrs = m_attrs;
int index = 0;
while (attrs != 0) {
if ((attrs & 1) != 0)
list.append(QGL::VertexAttribute(index));
++index;
attrs >>= 1;
}
return list;
}
/*!
Returns a new attribute set that is initialized with the members
of \a list.
\sa toList(), insert()
*/
QGLAttributeSet QGLAttributeSet::fromList(const QList<QGL::VertexAttribute> &list)
{
QGLAttributeSet set;
for (int index = 0; index < list.size(); ++index)
set.insert(list.at(index));
return set;
}
/*!
\fn void QGLAttributeSet::unite(const QGLAttributeSet &other)
Unites the contents of \a other with this attribute set
and modifies this set accordingly.
\sa intersect(), subtract(), insert()
*/
/*!
\fn void QGLAttributeSet::intersect(const QGLAttributeSet &other)
Intersects the contents of \a other with this attribute set
and modifies this set accordingly.
\sa unite(), subtract()
*/
/*!
\fn void QGLAttributeSet::subtract(const QGLAttributeSet &other)
Subtracts the contents of \a other from this attribute set
and modifies this set accordingly.
\sa unite(), intersect(), remove()
*/
/*!
\fn bool QGLAttributeSet::operator==(const QGLAttributeSet &other) const
Returns true if this attribute set has the same elements as \a other;
false otherwise.
\sa operator!=()
*/
/*!
\fn bool QGLAttributeSet::operator!=(const QGLAttributeSet &other) const
Returns true if this attribute set does not have the same elements as
\a other; false otherwise.
\sa operator==()
*/
QT_END_NAMESPACE
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