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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui 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 <private/qopenglpaintdevice_p.h>
#include <private/qopenglcontext_p.h>
#include <private/qopenglframebufferobject_p.h>
#include <qopenglfunctions.h>
QT_BEGIN_NAMESPACE
QOpenGLPaintDevice::QOpenGLPaintDevice()
: m_thisFBO(0)
{
}
QOpenGLPaintDevice::~QOpenGLPaintDevice()
{
}
int QOpenGLPaintDevice::metric(QPaintDevice::PaintDeviceMetric metric) const
{
switch(metric) {
case PdmWidth:
return size().width();
case PdmHeight:
return size().height();
case PdmDepth: {
const QSurfaceFormat f = format();
return f.redBufferSize() + f.greenBufferSize() + f.blueBufferSize() + f.alphaBufferSize();
}
default:
qWarning("QOpenGLPaintDevice::metric() - metric %d not known", metric);
return 0;
}
}
void QOpenGLPaintDevice::beginPaint()
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
// Record the currently bound FBO so we can restore it again
// in endPaint() and bind this device's FBO
//
// Note: m_thisFBO could be zero if the paint device is not
// backed by an FBO (e.g. window back buffer). But there could
// be a previous FBO bound to the context which we need to
// explicitly unbind. Otherwise the painting will go into
// the previous FBO instead of to the window.
m_previousFBO = ctx->d_func()->current_fbo;
if (m_previousFBO != m_thisFBO) {
ctx->d_func()->current_fbo = m_thisFBO;
QOpenGLFunctions(ctx).glBindFramebuffer(GL_FRAMEBUFFER, m_thisFBO);
}
// Set the default fbo for the context to m_thisFBO so that
// if some raw GL code between beginNativePainting() and
// endNativePainting() calls QOpenGLFramebufferObject::release(),
// painting will revert to the window surface's fbo.
ctx->d_func()->default_fbo = m_thisFBO;
}
void QOpenGLPaintDevice::ensureActiveTarget()
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
if (ctx->d_func()->current_fbo != m_thisFBO) {
ctx->d_func()->current_fbo = m_thisFBO;
QOpenGLFunctions(ctx).glBindFramebuffer(GL_FRAMEBUFFER, m_thisFBO);
}
ctx->d_func()->default_fbo = m_thisFBO;
}
void QOpenGLPaintDevice::endPaint()
{
// Make sure the FBO bound at beginPaint is re-bound again here:
QOpenGLContext *ctx = QOpenGLContext::currentContext();
if (m_previousFBO != ctx->d_func()->current_fbo) {
ctx->d_func()->current_fbo = m_previousFBO;
QOpenGLFunctions(ctx).glBindFramebuffer(GL_FRAMEBUFFER, m_previousFBO);
}
ctx->d_func()->default_fbo = 0;
}
bool QOpenGLPaintDevice::isFlipped() const
{
return false;
}
// returns the QOpenGLPaintDevice for the given QPaintDevice
QOpenGLPaintDevice* QOpenGLPaintDevice::getDevice(QPaintDevice* pd)
{
QOpenGLPaintDevice* glpd = 0;
switch(pd->devType()) {
case QInternal::FramebufferObject:
glpd = &(static_cast<QOpenGLFramebufferObject*>(pd)->d_func()->glDevice);
break;
case QInternal::Pixmap: {
qWarning("Pixmap type not supported for GL rendering");
break;
}
default:
qWarning("QOpenGLPaintDevice::getDevice() - Unknown device type %d", pd->devType());
break;
}
return glpd;
}
QT_END_NAMESPACE
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