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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qglframebufferobjectsurface.h"
#include <QtGui/QOpenGLContext>
#include <QtCore/QDebug>
QT_BEGIN_NAMESPACE
/*!
\class QGLFramebufferObjectSurface
\brief The QGLFramebufferObjectSurface class represents a framebuffer object that is being used as an OpenGL drawing surface.
\since 4.8
\ingroup qt3d
\ingroup qt3d::painting
*/
// This exists solely for future expansion
class QGLFramebufferObjectSurfacePrivate
{
public:
QGLFramebufferObjectSurfacePrivate()
: forExpansion(0) {}
int forExpansion;
};
/*!
Constructs a default framebuffer object surface. This constructor
should be followed by a call to setFramebufferObject().
*/
QGLFramebufferObjectSurface::QGLFramebufferObjectSurface()
: QGLAbstractSurface(QGLAbstractSurface::FramebufferObject)
, d_ptr(new QGLFramebufferObjectSurfacePrivate)
{
}
/*!
Constructs a framebuffer object surface for \a fbo and \a context.
If \a context is null, then the framebuffer will be bound to the
current context when activate() is called.
*/
QGLFramebufferObjectSurface::QGLFramebufferObjectSurface
(QOpenGLFramebufferObject *fbo, QOpenGLContext *context)
: QGLAbstractSurface(QGLAbstractSurface::FramebufferObject)
, d_ptr(new QGLFramebufferObjectSurfacePrivate)
{
m_fbo = fbo;
m_context = context;
}
/*!
Destroys this framebuffer object surface.
*/
QGLFramebufferObjectSurface::~QGLFramebufferObjectSurface()
{
}
/*!
Returns the framebuffer object for this surface, or null if
it has not been set yet.
\sa setFramebufferObject()
*/
QOpenGLFramebufferObject *QGLFramebufferObjectSurface::framebufferObject() const
{
return m_fbo;
}
/*!
Sets the framebuffer object for this surface to \a fbo.
\sa framebufferObject()
*/
void QGLFramebufferObjectSurface::setFramebufferObject
(QOpenGLFramebufferObject *fbo)
{
m_fbo = fbo;
}
/*!
\reimp
*/
bool QGLFramebufferObjectSurface::activate(QGLAbstractSurface *prevSurface)
{
Q_UNUSED(prevSurface);
bool success = false;
if (m_context) {
if (!QOpenGLContext::areSharing(QOpenGLContext::currentContext(), m_context))
{
m_context->makeCurrent(m_context->surface());
}
} else {
m_context = QOpenGLContext::currentContext();
}
if (isValid())
{
success = m_fbo->bind();
}
#ifndef QT_NO_DEBUG_STREAM
else
{
qWarning() << "Attempt to activate invalid fbo surface";
}
#endif
return success;
}
/*!
\reimp
*/
void QGLFramebufferObjectSurface::deactivate(QGLAbstractSurface *nextSurface)
{
if (m_fbo) {
if (nextSurface && nextSurface->surfaceType() == FramebufferObject) {
// If we are about to switch to another fbo that is on the
// same context, then don't bother doing the release().
// This saves an unnecessary glBindFramebuffer(0) call.
if (static_cast<QGLFramebufferObjectSurface *>(nextSurface)
->context() == m_context)
return;
}
m_fbo->release();
}
}
/*!
\reimp
*/
QRect QGLFramebufferObjectSurface::viewportGL() const
{
if (m_fbo)
return QRect(QPoint(0, 0), m_fbo->size());
else
return QRect();
}
/*!
\reimp
*/
bool QGLFramebufferObjectSurface::isValid() const
{
return QGLAbstractSurface::isValid() && m_fbo && m_context;
}
QT_END_NAMESPACE
|
