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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#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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