2012-06-05 11:21:55 +00:00
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/****************************************************************************
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**
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2012-09-19 12:28:29 +00:00
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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2012-06-05 11:21:55 +00:00
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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2012-09-19 12:28:29 +00:00
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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2012-06-05 11:21:55 +00:00
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "openglwindow.h"
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#include <QtCore/QCoreApplication>
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#include <QtGui/QOpenGLContext>
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#include <QtGui/QOpenGLPaintDevice>
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#include <QtGui/QPainter>
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//! [1]
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OpenGLWindow::OpenGLWindow(QWindow *parent)
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: QWindow(parent)
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, m_update_pending(false)
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, m_animating(false)
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, m_context(0)
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, m_device(0)
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{
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setSurfaceType(QWindow::OpenGLSurface);
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}
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//! [1]
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OpenGLWindow::~OpenGLWindow()
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{
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delete m_device;
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}
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//! [2]
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void OpenGLWindow::render(QPainter *painter)
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{
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Q_UNUSED(painter);
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}
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void OpenGLWindow::initialize()
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{
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}
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void OpenGLWindow::render()
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{
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if (!m_device)
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m_device = new QOpenGLPaintDevice;
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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m_device->setSize(size());
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QPainter painter(m_device);
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render(&painter);
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}
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//! [2]
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//! [3]
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void OpenGLWindow::renderLater()
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{
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if (!m_update_pending) {
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m_update_pending = true;
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QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
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}
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}
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bool OpenGLWindow::event(QEvent *event)
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{
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switch (event->type()) {
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case QEvent::UpdateRequest:
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renderNow();
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return true;
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default:
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return QWindow::event(event);
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}
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}
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void OpenGLWindow::exposeEvent(QExposeEvent *event)
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{
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Q_UNUSED(event);
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if (isExposed())
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renderNow();
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}
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void OpenGLWindow::resizeEvent(QResizeEvent *event)
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{
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Q_UNUSED(event);
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if (isExposed())
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renderNow();
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}
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//! [3]
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//! [4]
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void OpenGLWindow::renderNow()
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{
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if (!isExposed())
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return;
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m_update_pending = false;
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bool needsInitialize = false;
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if (!m_context) {
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m_context = new QOpenGLContext(this);
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m_context->setFormat(requestedFormat());
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m_context->create();
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needsInitialize = true;
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}
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m_context->makeCurrent(this);
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if (needsInitialize) {
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initializeOpenGLFunctions();
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initialize();
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}
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render();
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m_context->swapBuffers(this);
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if (m_animating)
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renderLater();
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}
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//! [4]
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//! [5]
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void OpenGLWindow::setAnimating(bool animating)
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{
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m_animating = animating;
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if (animating)
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renderLater();
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}
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//! [5]
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