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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module 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 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QPLATFORMOPENGLCONTEXT_H
#define QPLATFORMOPENGLCONTEXT_H

//
//  W A R N I N G
//  -------------
//
// This file is part of the QPA API and is not meant to be used
// in applications. Usage of this API may make your code
// source and binary incompatible with future versions of Qt.
//

#include <QtGui/qtguiglobal.h>
#include <QtCore/qnamespace.h>

#ifndef QT_NO_OPENGL

#include <QtGui/qsurfaceformat.h>
#include <QtGui/qwindow.h>
#include <QtGui/qopengl.h>
#include <QtGui/qopenglcontext.h>

#include <QtCore/qnativeinterface.h>

QT_BEGIN_NAMESPACE


class QPlatformOpenGLContextPrivate;

class Q_GUI_EXPORT QPlatformOpenGLContext
{
    Q_DECLARE_PRIVATE(QPlatformOpenGLContext)
public:
    QPlatformOpenGLContext();
    virtual ~QPlatformOpenGLContext();

    virtual void initialize();

    virtual QSurfaceFormat format() const = 0;

    virtual void swapBuffers(QPlatformSurface *surface) = 0;

    virtual GLuint defaultFramebufferObject(QPlatformSurface *surface) const;

    virtual bool makeCurrent(QPlatformSurface *surface) = 0;
    virtual void doneCurrent() = 0;

    virtual void beginFrame();
    virtual void endFrame();

    virtual bool isSharing() const { return false; }
    virtual bool isValid() const { return true; }

    virtual QFunctionPointer getProcAddress(const char *procName) = 0;

    QOpenGLContext *context() const;

    static bool parseOpenGLVersion(const QByteArray &versionString, int &major, int &minor);

private:
    friend class QOpenGLContext;
    friend class QOpenGLContextPrivate;

    QScopedPointer<QPlatformOpenGLContextPrivate> d_ptr;

    void setContext(QOpenGLContext *context);

    Q_DISABLE_COPY(QPlatformOpenGLContext)
};

namespace QNativeInterface::Private {

#if defined(Q_OS_MACOS)
struct Q_GUI_EXPORT QCocoaGLIntegration
{
    QT_DECLARE_NATIVE_INTERFACE(QCocoaGLIntegration)
    virtual QOpenGLContext *createOpenGLContext(NSOpenGLContext *, QOpenGLContext *shareContext) const = 0;
};
#endif

#if defined(Q_OS_WIN)
struct Q_GUI_EXPORT QWindowsGLIntegration
{
    QT_DECLARE_NATIVE_INTERFACE(QWindowsGLIntegration)
    virtual HMODULE openGLModuleHandle() const = 0;
    virtual QOpenGLContext *createOpenGLContext(HGLRC context, HWND window, QOpenGLContext *shareContext) const = 0;
};
#endif

#if QT_CONFIG(xcb_glx_plugin)
struct Q_GUI_EXPORT QGLXIntegration
{
    QT_DECLARE_NATIVE_INTERFACE(QGLXIntegration)
    virtual QOpenGLContext *createOpenGLContext(GLXContext context, void *visualInfo, QOpenGLContext *shareContext) const = 0;
};
#endif

#if QT_CONFIG(egl)
struct Q_GUI_EXPORT QEGLIntegration
{
    QT_DECLARE_NATIVE_INTERFACE(QEGLIntegration)
    virtual QOpenGLContext *createOpenGLContext(EGLContext context, EGLDisplay display, QOpenGLContext *shareContext) const = 0;
};
#endif

} // QNativeInterface::Private

QT_END_NAMESPACE

#endif // QT_NO_OPENGL

#endif // QPLATFORMOPENGLCONTEXT_H