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canvas3d.cpp 24.95 KiB
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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtCanvas3D module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL3$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPLv3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or later as published by the Free
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** Software Foundation and appearing in the file LICENSE.GPL included in
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** the packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 2.0 requirements will be
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** met: http://www.gnu.org/licenses/gpl-2.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "canvas3d_p.h"
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#include "context3d_p.h"
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#include "canvas3dcommon_p.h"
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#include "canvasrendernode_p.h"
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#include "teximage3d_p.h"
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#include <QtGui/QGuiApplication>
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#include <QtGui/QOffscreenSurface>
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#include <QtGui/QOpenGLContext>
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#include <QtGui/QOpenGLFramebufferObject>
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#include <QtQml/QQmlEngine>
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#include <QtQml/QQmlContext>
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#include <QtCore/QElapsedTimer>
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QT_BEGIN_NAMESPACE
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QT_CANVAS3D_BEGIN_NAMESPACE
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/*!
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 * \qmltype Canvas3D
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 * \since QtCanvas3D 1.0
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 * \ingroup qtcanvas3d-qml-types
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 * \brief Canvas that provides a 3D rendering context.
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 *
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 * The Canvas3D is a QML element that, when placed in your Qt Quick 2 scene, allows you to
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 * get a 3D rendering context and call 3D rendering API calls through that context object.
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 * Use of the rendering API requires knowledge of OpenGL like rendering APIs.
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 *
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 * There are two functions that are called by the Canvas3D implementation:
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 * \list
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 * \li initGL is emitted before the first frame is rendered, and usually during that you get
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 * the 3D context and initialize resources to be used later on during the rendering cycle.
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 * \li renderGL is emitted for each frame to be rendered, and usually during that you
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 * submit 3D rendering calls to draw whatever 3D content you want to be displayed.
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 * \endlist