/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qtechniquefilter.h"
#include "qtechniquefilter_p.h"
#include <Qt3DRender/qfilterkey.h>
#include <Qt3DRender/qparameter.h>

QT_BEGIN_NAMESPACE

using namespace Qt3DCore;

namespace Qt3DRender {

QTechniqueFilterPrivate::QTechniqueFilterPrivate()
    : QFrameGraphNodePrivate()
{
}

/*!
    \class Qt3DRender::QTechniqueFilter
    \inmodule Qt3DRender
    \since 5.7
    \brief A QFrameGraphNode used to select QTechniques to use.

    A Qt3DRender::QTechniqueFilter specifies which techniques are used
    by the FrameGraph when rendering the entities. QTechniqueFilter specifies
    a list of Qt3DRender::QFilterKey objects and Qt3DRender::QParameter objects.
    When QTechniqueFilter is present in the FrameGraph, only the techiques matching
    the keys in the list are used for rendering. The parameters in the list can be used
    to set values for shader parameters. The parameters in QTechniqueFilter are
    overridden by parameters in QTechnique and QRenderPass.
*/

/*!
    \qmltype TechniqueFilter
    \inqmlmodule Qt3D.Render
    \instantiates Qt3DRender::QTechniqueFilter
    \inherits FrameGraphNode
    \since 5.7
    \brief A FrameGraphNode used to select used Techniques.

    A TechniqueFilter specifies which techniques are used by the FrameGraph
    when rendering the entities. TechniqueFilter specifies
    a list of FilterKey objects and Parameter objects.
    When TechniqueFilter is present in the FrameGraph, only the techiques matching
    the keys in list are used for rendering. The parameters in the list can be used
    to set values for shader parameters. The parameters in TechniqueFilter are
    overridden by parameters in Technique and RenderPass.
*/

/*!
    \qmlproperty list<FilterKey> TechniqueFilter::matchAll
    Holds the list of filterkeys used by the TechiqueFilter
*/

/*!
    \qmlproperty list<Parameter> TechniqueFilter::parameters
    Holds the list of parameters used by the TechiqueFilter
*/

/*!
    The constructor creates an instance with the specified \a parent.
 */
QTechniqueFilter::QTechniqueFilter(QNode *parent)
    : QFrameGraphNode(*new QTechniqueFilterPrivate, parent)
{
}

/*! \internal */
QTechniqueFilter::~QTechniqueFilter()
{
}

/*! \internal */
QTechniqueFilter::QTechniqueFilter(QTechniqueFilterPrivate &dd, QNode *parent)
    : QFrameGraphNode(dd, parent)
{
}

/*!
    Returns a vector of the current keys for the filter.
 */
QVector<QFilterKey *> QTechniqueFilter::matchAll() const
{
    Q_D(const QTechniqueFilter);
    return d->m_matchList;
}

/*!
    Add the \a filterKey to the match vector.
 */
void QTechniqueFilter::addMatch(QFilterKey *filterKey)
{
    Q_ASSERT(filterKey);
    Q_D(QTechniqueFilter);
    if (!d->m_matchList.contains(filterKey)) {
        d->m_matchList.append(filterKey);

        // Ensures proper bookkeeping
        d->registerDestructionHelper(filterKey, &QTechniqueFilter::removeMatch, d->m_matchList);

        // We need to add it as a child of the current node if it has been declared inline
        // Or not previously added as a child of the current node so that
        // 1) The backend gets notified about it's creation
        // 2) When the current node is destroyed, it gets destroyed as well
        if (!filterKey->parent())
            filterKey->setParent(this);

        d->update();
    }
}

/*!
    Remove the \a filterKey from the match vector.
 */
void QTechniqueFilter::removeMatch(QFilterKey *filterKey)
{
    Q_ASSERT(filterKey);
    Q_D(QTechniqueFilter);
    if (!d->m_matchList.removeOne(filterKey))
        return;
    d->update();
    // Remove bookkeeping connection
    d->unregisterDestructionHelper(filterKey);
}

/*!
    Add \a parameter to the vector of parameters that will be passed to the graphics pipeline.
 */
void QTechniqueFilter::addParameter(QParameter *parameter)
{
    Q_ASSERT(parameter);
    Q_D(QTechniqueFilter);
    if (!d->m_parameters.contains(parameter)) {
        d->m_parameters.append(parameter);

        // Ensures proper bookkeeping
        d->registerDestructionHelper(parameter, &QTechniqueFilter::removeParameter, d->m_parameters);

        // We need to add it as a child of the current node if it has been declared inline
        // Or not previously added as a child of the current node so that
        // 1) The backend gets notified about it's creation
        // 2) When the current node is destroyed, the child parameters get destroyed as well
        if (!parameter->parent())
            parameter->setParent(this);

        d->update();
    }
}

/*!
    Remove \a parameter from the vector of parameters passed to the graphics pipeline.
 */
void QTechniqueFilter::removeParameter(QParameter *parameter)
{
    Q_ASSERT(parameter);
    Q_D(QTechniqueFilter);
    if (!d->m_parameters.removeOne(parameter))
        return;
    d->update();
    // Remove bookkeeping connection
    d->unregisterDestructionHelper(parameter);
}

/*!
    Returns the current vector of parameters.
 */
QVector<QParameter *> QTechniqueFilter::parameters() const
{
    Q_D(const QTechniqueFilter);
    return d->m_parameters;
}

} // namespace Qt3DRender

QT_END_NAMESPACE