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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "stereovieweffect.h"
#include <QtGui/qpainter.h>
#include <QtGui/qpaintengine.h>
#include <QtOpenGL/qgl.h>
StereoViewEffect::StereoViewEffect(StereoView *parent)
: QGraphicsEffect(parent)
, m_view(parent)
{
}
StereoViewEffect::~StereoViewEffect()
{
}
void StereoViewEffect::draw(QPainter *painter)
{
// Determine if we have an OpenGL rendering surface or not.
QPaintEngine *engine = painter->paintEngine();
bool isOpenGL = (engine->type() == QPaintEngine::OpenGL ||
engine->type() == QPaintEngine::OpenGL2);
// Determine how to draw the two eye images.
StereoView::Layout layout = m_view->layout();
if (layout == StereoView::RedCyan) {
// Draw the scene twice with red and cyan filters.
if (isOpenGL) {
m_view->setEye(QGL::LeftEye);
glColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_TRUE);
drawSource(painter);
m_view->setEye(QGL::RightEye);
glColorMask(GL_FALSE, GL_TRUE, GL_TRUE, GL_TRUE);
drawSource(painter);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
m_view->setEye(QGL::NoEye);
} else {
// No OpenGL, so draw normally.
drawSource(painter);
}
} else if (layout == StereoView::Default ||
layout == StereoView::Hardware) {
// Draw the scene into the left and right back buffers.
#if defined(GL_BACK_LEFT) && defined(GL_BACK_RIGHT)
if (isOpenGL && QGLContext::currentContext()->format().stereo()) {
m_view->setEye(QGL::LeftEye);
glDrawBuffer(GL_BACK_LEFT);
drawSource(painter);
m_view->setEye(QGL::RightEye);
glDrawBuffer(GL_BACK_RIGHT);
drawSource(painter);
m_view->setEye(QGL::NoEye);
} else
#endif
if (isOpenGL && layout == StereoView::Default) {
// No hardware stereo, so use red-cyan instead.
m_view->setEye(QGL::LeftEye);
glColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_TRUE);
drawSource(painter);
m_view->setEye(QGL::RightEye);
glColorMask(GL_FALSE, GL_TRUE, GL_TRUE, GL_TRUE);
drawSource(painter);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
m_view->setEye(QGL::NoEye);
} else {
// No OpenGL or red-cyan not allowed, so draw normally.
drawSource(painter);
}
} else if (layout != StereoView::Disabled) {
// Fetch the original window and viewport from the painter.
// We then use these values to set up an alternative logical
// co-ordinate system that shifts drawing into the left or
// right screen halves.
QRect window = painter->window();
QRect viewport = painter->viewport();
QRect leftViewport(viewport);
QRect rightViewport(viewport);
switch (layout) {
case StereoView::LeftRight: default:
window.setWidth(window.width() / 2);
// Fall through.
case StereoView::StretchedLeftRight:
leftViewport.setWidth(viewport.width() / 2);
rightViewport.setX(leftViewport.right() + 1);
rightViewport.setWidth(viewport.width() - leftViewport.width());
break;
case StereoView::RightLeft:
window.setWidth(window.width() / 2);
// Fall through.
case StereoView::StretchedRightLeft:
rightViewport.setWidth(viewport.width() / 2);
leftViewport.setX(rightViewport.right() + 1);
leftViewport.setWidth(viewport.width() - rightViewport.width());
break;
case StereoView::TopBottom:
window.setHeight(window.height() / 2);
// Fall through.
case StereoView::StretchedTopBottom:
leftViewport.setHeight(viewport.height() / 2);
rightViewport.setY(leftViewport.bottom() + 1);
rightViewport.setHeight(viewport.height() - leftViewport.height());
break;
case StereoView::BottomTop:
window.setHeight(window.height() / 2);
// Fall through.
case StereoView::StretchedBottomTop:
rightViewport.setHeight(viewport.height() / 2);
leftViewport.setY(rightViewport.bottom() + 1);
leftViewport.setHeight(viewport.height() - rightViewport.height());
break;
}
// Draw the left eye image into one half of the screen.
m_view->setEye(QGL::LeftEye);
painter->save();
painter->setWindow(window);
painter->setViewport(leftViewport);
painter->setClipRect(window, Qt::IntersectClip);
drawSource(painter);
painter->restore();
// Draw the right eye image into the other half of the screen.
m_view->setEye(QGL::RightEye);
painter->save();
painter->setWindow(window);
painter->setViewport(rightViewport);
painter->setClipRect(window, Qt::IntersectClip);
drawSource(painter);
painter->restore();
m_view->setEye(QGL::NoEye);
} else {
// Stereo rendering has been explicitly disabled.
drawSource(painter);
}
}
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