Add context adoption support for WGL

This is trickier than the GLX and EGL implementations due to the
way pixel formats, windows and contexts work. Apart from some
restrictions, it should be fully functional nonetheless.

Add also some proper documentation.

Change-Id: Ia6e3eb1ab2701e439b8621b9092c2b0934ff2151
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/platformheaders/nativecontexts/qwglnativecontext.h b/src/platformheaders/nativecontexts/qwglnativecontext.h
new file mode 100644
index 0000000000..4a68633703
--- /dev/null
+++ b/src/platformheaders/nativecontexts/qwglnativecontext.h
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWGLNATIVECONTEXT_H
+#define QWGLNATIVECONTEXT_H
+
+#include <QtCore/QMetaType>
+#include <wingdi.h>
+#include <GL/gl.h>
+
+QT_BEGIN_NAMESPACE
+
+class QWGLNativeContext
+{
+public:
+    QWGLNativeContext()
+        : m_context(0),
+          m_window(0)
+    { }
+
+    QWGLNativeContext(HGLRC ctx, HWND wnd)
+        : m_context(ctx),
+          m_window(wnd)
+    { }
+
+    HGLRC context() const { return m_context; }
+    HWND window() const { return m_window; }
+
+private:
+    HGLRC m_context;
+    HWND m_window;
+};
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QWGLNativeContext)
+
+#endif // QWGLNATIVECONTEXT_H