/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtOpenGL module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** 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, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef QGLFRAMEBUFFEROBJECT_P_H

#define QGLFRAMEBUFFEROBJECT_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of the QLibrary class.  This header file may change from

// version to version without notice, or even be removed.

//

// We mean it.

//

QT_BEGIN_NAMESPACE

QT_BEGIN_INCLUDE_NAMESPACE

#include <qglframebufferobject.h>

#include <private/qglpaintdevice_p.h>

#include <private/qgl_p.h>

QT_END_INCLUDE_NAMESPACE

#ifndef QT_OPENGL_ES

#define DEFAULT_FORMAT GL_RGBA8

#else

#define DEFAULT_FORMAT GL_RGBA

#endif

class QGLFramebufferObjectFormatPrivate

{

public:

    QGLFramebufferObjectFormatPrivate()

        : ref(1),

          samples(0),

          attachment(QGLFramebufferObject::NoAttachment),

          target(GL_TEXTURE_2D),

          internal_format(DEFAULT_FORMAT)

    {

    }

    QGLFramebufferObjectFormatPrivate

            (const QGLFramebufferObjectFormatPrivate *other)

        : ref(1),

          samples(other->samples),

          attachment(other->attachment),

          target(other->target),

          internal_format(other->internal_format)

    {

    }

    bool equals(const QGLFramebufferObjectFormatPrivate *other)

    {

        return samples == other->samples &&

               attachment == other->attachment &&

               target == other->target &&

               internal_format == other->internal_format;

    }

    QAtomicInt ref;

    int samples;

    QGLFramebufferObject::Attachment attachment;

    GLenum target;

    GLenum internal_format;

};

class QGLFBOGLPaintDevice : public QGLPaintDevice

{

public:

    virtual QPaintEngine* paintEngine() const {return fbo->paintEngine();}

    virtual QSize size() const {return fbo->size();}

    virtual QGLContext* context() const;

    virtual QGLFormat format() const {return fboFormat;}

    void setFBO(QGLFramebufferObject* f,

                QGLFramebufferObject::Attachment attachment);

private:

    QGLFramebufferObject* fbo;

    QGLFormat fboFormat;

};

class QGLFramebufferObjectPrivate

{

public:

    QGLFramebufferObjectPrivate() : fbo_guard(0), texture(0), depth_stencil_buffer(0)

                                  , color_buffer(0), valid(false), engine(0) {}

    ~QGLFramebufferObjectPrivate() {}

    void init(QGLFramebufferObject *q, const QSize& sz,

              QGLFramebufferObject::Attachment attachment,

              GLenum internal_format, GLenum texture_target, GLint samples = 0);

    bool checkFramebufferStatus() const;

    QGLSharedResourceGuard fbo_guard;

    GLuint texture;

    GLuint depth_stencil_buffer;

    GLuint color_buffer;

    GLenum target;

    QSize size;

    QGLFramebufferObjectFormat format;

    uint valid : 1;

    QGLFramebufferObject::Attachment fbo_attachment;

    mutable QPaintEngine *engine;

    QGLFBOGLPaintDevice glDevice;

    inline GLuint fbo() const { return fbo_guard.id(); }

};

QT_END_NAMESPACE

#endif // QGLFRAMEBUFFEROBJECT_P_H