/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
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** This file is part of the Qt3D module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL3$
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** Licensees holding valid commercial Qt licenses may use this file in
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** 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
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****************************************************************************/

#include "qrendertargetselector.h"
#include "qrendertargetselector_p.h"
#include <Qt3DRender/qrendertarget.h>
#include <Qt3DCore/qscenepropertychange.h>
#include <Qt3DRender/private/qrenderpass_p.h>

QT_BEGIN_NAMESPACE

using namespace Qt3DCore;

namespace Qt3DRender {

/*!
    \class Qt3DRender::QRenderTargetSelectorPrivate
    \internal
*/
QRenderTargetSelectorPrivate::QRenderTargetSelectorPrivate()
    : QFrameGraphNodePrivate()
    , m_target(Q_NULLPTR)
{
}

void QRenderTargetSelector::copy(const QNode *ref)
{
    QFrameGraphNode::copy(ref);

    const QRenderTargetSelector *other = static_cast<const QRenderTargetSelector*>(ref);

    setDrawBuffers(other->drawBuffers());
    if (other->d_func()->m_target)
        setTarget(qobject_cast<QRenderTarget *>(QNode::clone(other->d_func()->m_target)));
}

QRenderTargetSelector::QRenderTargetSelector(QNode *parent)
    : QFrameGraphNode(*new QRenderTargetSelectorPrivate, parent)
{
}

QRenderTargetSelector::~QRenderTargetSelector()
{
    QNode::cleanup();
}

void QRenderTargetSelector::setTarget(QRenderTarget *target)
{
    Q_D(QRenderTargetSelector);
    if (d->m_target != target) {
        d->m_target = target;

        // For inline declaration cases
        if (target != Q_NULLPTR && !target->parent())
            target->setParent(this);
        emit targetChanged();
    }
}

QRenderTarget *QRenderTargetSelector::target() const
{
    Q_D(const QRenderTargetSelector);
    return d->m_target;
}

/*!
 * \internal
 * Sets the draw buffers \a buffers to be used. The draw buffers should be
 * matching the Qt3DRender::QRenderAttachment::RenderAttachmentType
 * defined in the attachments of the Qt3DRender::QRenderTarget associated to the
 * Qt3DRender::QRenderTargetSelector instance.
 *
 * \note At render time, if no draw buffer has been specified, the renderer will
 * default to using all the attachments' draw buffers.
 *
 */
void QRenderTargetSelector::setDrawBuffers(const QList<QRenderAttachment::RenderAttachmentType> &buffers)
{
    Q_D(QRenderTargetSelector);
    if (buffers != d->m_drawBuffers) {
        d->m_drawBuffers = buffers;

        if (d->m_changeArbiter) {
            QScenePropertyChangePtr change(new QScenePropertyChange(NodeUpdated, QSceneChange::Node, id()));
            change->setPropertyName("drawBuffers");
            change->setValue(QVariant::fromValue(d->m_drawBuffers));
            d->notifyObservers(change);
        }
    }
}

/*!
 * Returns the list of draw buffers for the current Qt3DRender::QRenderTargetSelector instance.
 */
QList<QRenderAttachment::RenderAttachmentType> QRenderTargetSelector::drawBuffers() const
{
    Q_D(const QRenderTargetSelector);
    return d->m_drawBuffers;
}

QRenderTargetSelector::QRenderTargetSelector(QRenderTargetSelectorPrivate &dd, QNode *parent)
    : QFrameGraphNode(dd, parent)
{
}

} // namespace Qt3DRender

QT_END_NAMESPACE