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-rw-r--r--src/quick/scenegraph/util/qsgengine.cpp269
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diff --git a/src/quick/scenegraph/util/qsgengine.cpp b/src/quick/scenegraph/util/qsgengine.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtQuick 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 "qsgengine_p.h"
-
-#include <QtQuick/qsgtexture.h>
-#include <private/qsgcontext_p.h>
-#include <private/qsgrenderer_p.h>
-#include <private/qsgtexture_p.h>
-
-#if QT_CONFIG(opengl)
-# include <QtGui/QOpenGLContext>
-# include <private/qsgdefaultrendercontext_p.h>
-#endif
-
-QT_BEGIN_NAMESPACE
-
-
-/*!
- \class QSGEngine
- \brief The QSGEngine class allows low level rendering of a scene graph.
- \inmodule QtQuick
- \since 5.4
-
- A QSGEngine can be used to render a tree of QSGNode directly on a QWindow
- or QOpenGLFramebufferObject without any integration with QML, QQuickWindow
- or QQuickItem and the convenience that they provide.
-
- This means that you must handle event propagation, animation timing,
- and node lifetime yourself.
-
- \note This class is for very low level access to an independent scene graph.
- Most of the time you will instead want to subclass QQuickItem and insert
- your QSGNode in a normal QtQuick scene by overriding QQuickItem::updatePaintNode().
-
- \sa QSGAbstractRenderer
- */
-
-/*!
- \enum QSGEngine::CreateTextureOption
-
- The CreateTextureOption enums are used to customize how a texture is wrapped.
-
- \value TextureHasAlphaChannel The texture has an alpha channel and should
- be drawn using blending.
-
- \value TextureOwnsGLTexture The texture object owns the texture id and
- will delete the GL texture when the texture object is deleted.
-
- \value TextureCanUseAtlas The image can be uploaded into a texture atlas.
-
- \value TextureIsOpaque The texture object is opaque.
- */
-
-QSGEnginePrivate::QSGEnginePrivate()
- : sgContext(QSGContext::createDefaultContext())
- , sgRenderContext(sgContext.data()->createRenderContext())
-{
-}
-
-/*!
- Constructs a new QSGEngine with its \a parent
- */
-QSGEngine::QSGEngine(QObject *parent)
- : QObject(*(new QSGEnginePrivate), parent)
-{
-}
-
-/*!
- Destroys the engine
- */
-QSGEngine::~QSGEngine()
-{
-}
-
-/*!
- Initialize the engine with \a context.
-
- \warning You have to make sure that you call
- QOpenGLContext::makeCurrent() on \a context before calling this.
- */
-void QSGEngine::initialize(QOpenGLContext *context)
-{
- Q_D(QSGEngine);
-#if QT_CONFIG(opengl)
- if (context && QOpenGLContext::currentContext() != context) {
- qWarning("WARNING: The context must be current before calling QSGEngine::initialize.");
- return;
- }
-#endif
- if (d->sgRenderContext && !d->sgRenderContext->isValid()) {
- d->sgRenderContext->setAttachToGraphicsContext(false);
- d->sgRenderContext->initialize(context);
-#if QT_CONFIG(opengl)
- if (context)
- connect(context, &QOpenGLContext::aboutToBeDestroyed, this, &QSGEngine::invalidate);
-#endif
- }
-}
-
-/*!
- Invalidate the engine releasing its resources
-
- You will have to call initialize() and createRenderer() if you
- want to use it again.
- */
-void QSGEngine::invalidate()
-{
- Q_D(QSGEngine);
- d->sgRenderContext->invalidate();
-}
-
-/*!
- Returns a renderer that can be used to render a QSGNode tree
-
- You call initialize() first with the QOpenGLContext that you
- want to use with this renderer. This will return a null
- renderer otherwise.
- */
-QSGAbstractRenderer *QSGEngine::createRenderer() const
-{
- Q_D(const QSGEngine);
- if (!d->sgRenderContext->isValid())
- return nullptr;
-
- QSGRenderer *renderer = d->sgRenderContext->createRenderer();
- renderer->setCustomRenderMode(qgetenv("QSG_VISUALIZE"));
- return renderer;
-}
-
-/*!
- Creates a texture using the data of \a image
-
- Valid \a options are TextureCanUseAtlas and TextureIsOpaque.
-
- The caller takes ownership of the texture and the
- texture should only be used with this engine.
-
- \sa createTextureFromId(), QSGSimpleTextureNode::setOwnsTexture(), QQuickWindow::createTextureFromImage()
- */
-QSGTexture *QSGEngine::createTextureFromImage(const QImage &image, CreateTextureOptions options) const
-{
- Q_D(const QSGEngine);
- if (!d->sgRenderContext->isValid())
- return nullptr;
- uint flags = 0;
- if (options & TextureCanUseAtlas) flags |= QSGRenderContext::CreateTexture_Atlas;
- if (!(options & TextureIsOpaque)) flags |= QSGRenderContext::CreateTexture_Alpha;
- return d->sgRenderContext->createTexture(image, flags);
-}
-
-/*!
- Creates a texture object that wraps the GL texture \a id uploaded with \a size
-
- Valid \a options are TextureHasAlphaChannel and TextureOwnsGLTexture
-
- The caller takes ownership of the texture object and the
- texture should only be used with this engine.
-
- \sa createTextureFromImage(), QSGSimpleTextureNode::setOwnsTexture(), QQuickWindow::createTextureFromId()
- */
-QSGTexture *QSGEngine::createTextureFromId(uint id, const QSize &size, CreateTextureOptions options) const
-{
- Q_D(const QSGEngine);
- if (d->sgRenderContext->isValid()) {
- QSGPlainTexture *texture = new QSGPlainTexture();
- texture->setTextureId(id);
- texture->setHasAlphaChannel(options & TextureHasAlphaChannel);
- texture->setOwnsTexture(options & TextureOwnsGLTexture);
- texture->setTextureSize(size);
- return texture;
- }
- return nullptr;
-}
-
-/*!
- Returns the current renderer interface if there is one. Otherwise null is returned.
-
- \sa QSGRenderNode, QSGRendererInterface
- \since 5.8
- */
-QSGRendererInterface *QSGEngine::rendererInterface() const
-{
- Q_D(const QSGEngine);
- return d->sgRenderContext->isValid()
- ? d->sgRenderContext->sceneGraphContext()->rendererInterface(d->sgRenderContext.data())
- : nullptr;
-}
-
-/*!
- Creates a simple rectangle node. When the scenegraph is not initialized, the return value is null.
-
- This is cross-backend alternative to constructing a QSGSimpleRectNode directly.
-
- \since 5.8
- \sa QSGRectangleNode
- */
-QSGRectangleNode *QSGEngine::createRectangleNode() const
-{
- Q_D(const QSGEngine);
- return d->sgRenderContext->isValid() ? d->sgRenderContext->sceneGraphContext()->createRectangleNode() : nullptr;
-}
-
-/*!
- Creates a simple image node. When the scenegraph is not initialized, the return value is null.
-
- This is cross-backend alternative to constructing a QSGSimpleTextureNode directly.
-
- \since 5.8
- \sa QSGImageNode
- */
-
-QSGImageNode *QSGEngine::createImageNode() const
-{
- Q_D(const QSGEngine);
- return d->sgRenderContext->isValid() ? d->sgRenderContext->sceneGraphContext()->createImageNode() : nullptr;
-}
-
-/*!
- Creates a nine patch node. When the scenegraph is not initialized, the return value is null.
-
- \since 5.8
- */
-
-QSGNinePatchNode *QSGEngine::createNinePatchNode() const
-{
- Q_D(const QSGEngine);
- return d->sgRenderContext->isValid() ? d->sgRenderContext->sceneGraphContext()->createNinePatchNode() : nullptr;
-}
-
-QT_END_NAMESPACE
-
-#include "moc_qsgengine.cpp"
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