qeglpbuffer.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <QtGui/qoffscreensurface.h>
#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");
 
    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