diff options
author | Samuel Rødal <samuel.rodal@nokia.com> | 2012-06-05 13:21:55 +0200 |
---|---|---|
committer | Qt by Nokia <qt-info@nokia.com> | 2012-08-29 16:53:00 +0200 |
commit | f3b45ffa6159bc8b7ecfb0578bbb5cb826de1338 (patch) | |
tree | c3a44c048086fc95081e8c19c3e5502c4f189ae0 /examples/gui/openglwindow/openglwindow.cpp | |
parent | 49c251e0543ea80e69d1725bb08bb4dfe3f225ab (diff) |
Added OpenGL example and documentation.
Change-Id: I2d9d4e52caf0a39fef9648d8a9e83a0c1328f650
Reviewed-by: Paul Olav Tvete <paul.tvete@nokia.com>
Diffstat (limited to 'examples/gui/openglwindow/openglwindow.cpp')
-rw-r--r-- | examples/gui/openglwindow/openglwindow.cpp | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/examples/gui/openglwindow/openglwindow.cpp b/examples/gui/openglwindow/openglwindow.cpp new file mode 100644 index 0000000000..6a052c32e2 --- /dev/null +++ b/examples/gui/openglwindow/openglwindow.cpp @@ -0,0 +1,169 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor +** the names of its contributors may be used to endorse or promote +** products derived from this software without specific prior written +** permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "openglwindow.h" + +#include <QtCore/QCoreApplication> + +#include <QtGui/QOpenGLContext> +#include <QtGui/QOpenGLPaintDevice> +#include <QtGui/QPainter> + +//! [1] +OpenGLWindow::OpenGLWindow(QWindow *parent) + : QWindow(parent) + , m_update_pending(false) + , m_animating(false) + , m_context(0) + , m_device(0) +{ + setSurfaceType(QWindow::OpenGLSurface); +} +//! [1] + +OpenGLWindow::~OpenGLWindow() +{ + delete m_device; +} +//! [2] +void OpenGLWindow::render(QPainter *painter) +{ + Q_UNUSED(painter); +} + +void OpenGLWindow::initialize() +{ +} + +void OpenGLWindow::render() +{ + if (!m_device) + m_device = new QOpenGLPaintDevice; + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); + + m_device->setSize(size()); + + QPainter painter(m_device); + render(&painter); +} +//! [2] + +//! [3] +void OpenGLWindow::renderLater() +{ + if (!m_update_pending) { + m_update_pending = true; + QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest)); + } +} + +bool OpenGLWindow::event(QEvent *event) +{ + switch (event->type()) { + case QEvent::UpdateRequest: + renderNow(); + return true; + default: + return QWindow::event(event); + } +} + +void OpenGLWindow::exposeEvent(QExposeEvent *event) +{ + Q_UNUSED(event); + + if (isExposed()) + renderNow(); +} + +void OpenGLWindow::resizeEvent(QResizeEvent *event) +{ + Q_UNUSED(event); + + if (isExposed()) + renderNow(); +} +//! [3] + +//! [4] +void OpenGLWindow::renderNow() +{ + if (!isExposed()) + return; + + m_update_pending = false; + + bool needsInitialize = false; + + if (!m_context) { + m_context = new QOpenGLContext(this); + m_context->setFormat(requestedFormat()); + m_context->create(); + + needsInitialize = true; + } + + m_context->makeCurrent(this); + + if (needsInitialize) { + initializeOpenGLFunctions(); + initialize(); + } + + render(); + + m_context->swapBuffers(this); + + if (m_animating) + renderLater(); +} +//! [4] + +//! [5] +void OpenGLWindow::setAnimating(bool animating) +{ + m_animating = animating; + + if (animating) + renderLater(); +} +//! [5] + |