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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include <QtGui/QOffscreenSurface>
#include "qeglpbuffer_p.h"
#include "qeglconvenience_p.h"
QT_BEGIN_NAMESPACE
/*!
\class QEGLPbuffer
\brief A pbuffer-based implementation of QPlatformOffscreenSurface for EGL.
\since 5.2
\internal
\ingroup qpa
To use this implementation in the platform plugin simply
reimplement QPlatformIntegration::createPlatformOffscreenSurface()
and return a new instance of this class.
*/
QEGLPbuffer::QEGLPbuffer(EGLDisplay display, const QSurfaceFormat &format, QOffscreenSurface *offscreenSurface,
QEGLPlatformContext::Flags flags)
: QPlatformOffscreenSurface(offscreenSurface)
, m_format(format)
, m_display(display)
, m_pbuffer(EGL_NO_SURFACE)
{
m_hasSurfaceless = !flags.testFlag(QEGLPlatformContext::NoSurfaceless)
&& q_hasEglExtension(display, "EGL_KHR_surfaceless_context");
// Disable surfaceless contexts on Mesa for now. As of 10.6.0 and Intel at least, some
// operations (glReadPixels) are unable to work without a surface since they at some
// point temporarily unbind the current FBO and then later blow up in some seemingly
// safe operations, like setting the viewport, that apparently need access to the
// read/draw surface in the Intel backend.
const char *vendor = eglQueryString(display, EGL_VENDOR); // hard to check for GL_ strings here, so blacklist all Mesa
if (vendor && strstr(vendor, "Mesa"))
m_hasSurfaceless = false;
if (m_hasSurfaceless)
return;
EGLConfig config = q_configFromGLFormat(m_display, m_format, false, EGL_PBUFFER_BIT);
if (config) {
const EGLint attributes[] = {
EGL_WIDTH, offscreenSurface->size().width(),
EGL_HEIGHT, offscreenSurface->size().height(),
EGL_LARGEST_PBUFFER, EGL_FALSE,
EGL_NONE
};
m_pbuffer = eglCreatePbufferSurface(m_display, config, attributes);
if (m_pbuffer != EGL_NO_SURFACE)
m_format = q_glFormatFromConfig(m_display, config);
}
}
QEGLPbuffer::~QEGLPbuffer()
{
if (m_pbuffer != EGL_NO_SURFACE)
eglDestroySurface(m_display, m_pbuffer);
}
bool QEGLPbuffer::isValid() const
{
return m_pbuffer != EGL_NO_SURFACE || m_hasSurfaceless;
}
QT_END_NAMESPACE
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