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/****************************************************************************
**
** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
** 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 "scene3ditem.h"
#include <Qt3DCore/QAspectEngine>
#include <Qt3DRenderer/QRenderAspect>
#include <Qt3DInput/QInputAspect>
#include <QOpenGLContext>
#include <QOpenGLFramebufferObject>
#include <QOpenGLFramebufferObjectFormat>
#include <QSurface>
#include <QQuickWindow>
#include <QSGSimpleTextureNode>
QT_BEGIN_NAMESPACE
class ContextSaver
{
public:
explicit ContextSaver(QOpenGLContext *context = QOpenGLContext::currentContext())
: m_context(context),
m_surface(context ? context->surface() : Q_NULLPTR)
{
}
~ContextSaver()
{
if (m_context)
m_context->makeCurrent(m_surface);
}
QOpenGLContext *context() const { return m_context; }
QSurface *surface() const { return m_surface; }
private:
QOpenGLContext * const m_context;
QSurface * const m_surface;
};
class FrameBufferObjectRenderer : public QQuickFramebufferObject::Renderer
{
public:
FrameBufferObjectRenderer(Scene3DItem *item,
Qt3D::QAspectEngine *aspectEngine,
Qt3D::QRenderAspect *renderAspect)
: m_item(item),
m_aspectEngine(aspectEngine),
m_renderAspect(renderAspect)
{
ContextSaver saver;
QVariantMap data;
data.insert(QStringLiteral("surface"), QVariant::fromValue(saver.surface()));
data.insert(QStringLiteral("eventSource"), QVariant::fromValue(m_item));
m_aspectEngine->setData(data);
m_renderAspect->renderInitialize(saver.context());
scheduleRootEntityChange();
}
void render() Q_DECL_OVERRIDE
{
if (m_aspectEngine->rootEntity() != m_item->entity())
scheduleRootEntityChange();
ContextSaver saver;
Q_UNUSED(saver)
m_renderAspect->renderSynchronous();
// We may have called doneCurrent() so restore the context.
saver.context()->makeCurrent(saver.surface());
// Reset the state used by the Qt Quick scenegraph to avoid any
// interference when rendering the rest of the UI.
m_item->window()->resetOpenGLState();
update();
}
QOpenGLFramebufferObject *createFramebufferObject(const QSize &size) Q_DECL_OVERRIDE
{
QOpenGLFramebufferObjectFormat format;
format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
format.setSamples(4);
return new QOpenGLFramebufferObject(size, format);
}
void scheduleRootEntityChange()
{
QMetaObject::invokeMethod(m_item, "applyRootEntityChange", Qt::QueuedConnection);
}
Scene3DItem *m_item;
Qt3D::QAspectEngine *m_aspectEngine;
Qt3D::QRenderAspect *m_renderAspect;
};
Scene3DItem::Scene3DItem(QQuickItem *parent)
: QQuickFramebufferObject(parent),
m_entity(Q_NULLPTR),
m_aspectEngine(new Qt3D::QAspectEngine(this)),
m_renderAspect(new Qt3D::QRenderAspect(Qt3D::QRenderAspect::Synchronous))
{
setFlag(QQuickItem::ItemHasContents, true);
setAcceptedMouseButtons(Qt::MouseButtonMask);
setAcceptHoverEvents(true);
m_aspectEngine->registerAspect(m_renderAspect);
m_aspectEngine->initialize();
}
Scene3DItem::~Scene3DItem()
{
m_renderAspect->renderShutdown();
}
QStringList Scene3DItem::aspects() const
{
return m_aspects;
}
Qt3D::QEntity *Scene3DItem::entity() const
{
return m_entity;
}
void Scene3DItem::setAspects(const QStringList &aspects)
{
if (!m_aspects.isEmpty()) {
qWarning() << "Aspects already set on the Scene3D, ignoring";
return;
}
m_aspects = aspects;
Q_FOREACH (const QString &aspect, m_aspects) {
if (aspect == QStringLiteral("render")) // This one is hardwired anyway
continue;
if (aspect == QStringLiteral("input")) {
m_aspectEngine->registerAspect(new Qt3D::QInputAspect);
continue;
}
m_aspectEngine->registerAspect(aspect);
}
emit aspectsChanged();
}
void Scene3DItem::setEntity(Qt3D::QEntity *entity)
{
if (entity == m_entity)
return;
m_entity = entity;
emit entityChanged();
}
void Scene3DItem::applyRootEntityChange()
{
if (m_aspectEngine->rootEntity() != m_entity)
m_aspectEngine->setRootEntity(m_entity);
}
QQuickFramebufferObject::Renderer *Scene3DItem::createRenderer() const
{
Scene3DItem *self = const_cast<Scene3DItem*>(this);
return new FrameBufferObjectRenderer(self, m_aspectEngine, m_renderAspect);
}
QSGNode *Scene3DItem::updatePaintNode(QSGNode *node, QQuickItem::UpdatePaintNodeData *nodeData)
{
if (!node) {
node = QQuickFramebufferObject::updatePaintNode(node, nodeData);
QSGSimpleTextureNode *textureNode = static_cast<QSGSimpleTextureNode *>(node);
if (textureNode)
textureNode->setTextureCoordinatesTransform(QSGSimpleTextureNode::MirrorVertically);
return node;
}
return QQuickFramebufferObject::updatePaintNode(node, nodeData);
}
QT_END_NAMESPACE
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