1 files changed, 63 insertions, 0 deletions
diff --git a/src/gui/opengl/platform/egl/qeglpbuffer.cpp b/src/gui/opengl/platform/egl/qeglpbuffer.cpp
new file mode 100644
index 0000000000..6a79d88f8c
--- /dev/null
+++ b/src/gui/opengl/platform/egl/qeglpbuffer.cpp
@@ -0,0 +1,63 @@
+// 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