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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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 "fbopaintdevice.h"
#include <QOffscreenSurface>
#include <QOpenGLFunctions>
QFboPaintDevice::QFboPaintDevice(const QSize &size, bool flipped, bool clearOnInit,
QOpenGLFramebufferObject::Attachment attachment)
: QOpenGLPaintDevice(size)
{
QOpenGLFramebufferObjectFormat format;
format.setAttachment(attachment);
format.setSamples(4);
m_framebufferObject = new QOpenGLFramebufferObject(size, format);
QOffscreenSurface *surface = new QOffscreenSurface();
surface->create();
m_surface = surface;
setPaintFlipped(flipped);
if (clearOnInit) {
m_framebufferObject->bind();
context()->functions()->glClearColor(0, 0, 0, 0);
context()->functions()->glClear(GL_COLOR_BUFFER_BIT);
}
}
QFboPaintDevice::~QFboPaintDevice()
{
delete m_framebufferObject;
delete m_surface;
}
void QFboPaintDevice::ensureActiveTarget()
{
if (QOpenGLContext::currentContext() != context())
context()->makeCurrent(m_surface);
m_framebufferObject->bind();
}
GLuint QFboPaintDevice::takeTexture()
{
// We have multisamples so we can't just forward takeTexture().
QOpenGLFramebufferObject resolvedFbo(m_framebufferObject->size(), m_framebufferObject->attachment());
QOpenGLFramebufferObject::blitFramebuffer(&resolvedFbo, m_framebufferObject);
return resolvedFbo.takeTexture();
}
QImage QFboPaintDevice::toImage() const
{
QOpenGLContext *currentContext = QOpenGLContext::currentContext();
QSurface *currentSurface = currentContext ? currentContext->surface() : nullptr;
context()->makeCurrent(m_surface);
QImage image = m_framebufferObject->toImage(!paintFlipped());
if (currentContext)
currentContext->makeCurrent(currentSurface);
else
context()->doneCurrent();
return image;
}
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