/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech AS. All rights reserved.
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef QGL_P_H
#define QGL_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.
//

#include "QtOpenGL/qgl.h"
#include "QtOpenGL/qglcolormap.h"
#include "QtCore/qmap.h"
#include "QtCore/qthreadstorage.h"
#include "private/qwidget_p.h"

class QGLContext;
class QGLOverlayWidget;
class QPixmap;
#ifdef Q_WS_MAC
#include <AGL/agl.h>
class QMacWindowChangeEvent;
#endif

class QGLFormatPrivate
{
public:
    QGLFormatPrivate() {
        opts = QGL::DoubleBuffer | QGL::DepthBuffer | QGL::Rgba | QGL::DirectRendering;
        pln = 0;
        depthSize = accumSize = stencilSize = alphaSize = -1;
        numSamples = -1;
    }
    QGL::FormatOptions opts;
    int pln;
    int depthSize;
    int accumSize;
    int stencilSize;
    int alphaSize;
    int numSamples;
};

class QGLWidgetPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QGLWidget)
public:
    QGLWidgetPrivate() : QWidgetPrivate() {}
    ~QGLWidgetPrivate() {}

    void init(QGLContext *context, const QGLWidget* shareWidget);
    bool renderCxPm(QPixmap *pixmap);
    void cleanupColormaps();

    QGLContext *glcx;
    bool autoSwap;

    QGLColormap cmap;
    QMap<QString, int> displayListCache;

#if defined(Q_WS_WIN)
    QGLContext *olcx;
#elif defined(Q_WS_X11)
    QGLOverlayWidget *olw;
#elif defined(Q_WS_MAC)
    QGLContext *olcx;
    void updatePaintDevice();
    QMacWindowChangeEvent *watcher;
#endif
};

class QGLContextPrivate
{
    Q_DECLARE_PUBLIC(QGLContext)
public:
    explicit QGLContextPrivate(QGLContext *context) : q_ptr(context) {}
    ~QGLContextPrivate() {}
    GLuint bindTexture(const QImage &image, GLenum target, GLint format, const QString &key,
                       qint64 qt_id, bool clean = false);
    GLuint bindTexture(const QPixmap &pixmap, GLenum target, GLint format, bool clean);
    GLuint bindTexture(const QImage &image, GLenum target, GLint format, bool clean);
    bool textureCacheLookup(const QString &key, GLuint *id, qint64 *qt_id);
    void init(QPaintDevice *dev, const QGLFormat &format);
    QImage convertToBGRA(const QImage &image);

#if defined(Q_WS_WIN)
    HGLRC rc;
    HDC dc;
    WId        win;
    int pixelFormatId;
    QGLCmap* cmap;
    HBITMAP hbitmap;
    HDC hbitmap_hdc;
#elif defined(Q_WS_X11) || defined(Q_WS_MAC)
    void* vi;
    void* cx;
#if defined(Q_WS_X11)
    quint32 gpm;
#endif
#if defined(Q_WS_MAC)
    bool update;
    AGLPixelFormat tryFormat(const QGLFormat &format);
#endif
#endif
    QGLFormat glFormat;
    QGLFormat reqFormat;

    uint valid : 1;
    uint sharing : 1;
    uint initDone : 1;
    uint crWin : 1;
    QPaintDevice *paintDevice;
    QColor transpColor;
    QGLContext *q_ptr;
};

// GL extension definitions
class QGLExtensions {
public:
    enum Extension {
        TextureRectangle        = 0x00000001,
        SampleBuffers           = 0x00000002,
        GenerateMipmap          = 0x00000004,
        TextureCompression      = 0x00000008,
        FragmentProgram         = 0x00000010,
        MirroredRepeat          = 0x00000020
    };
    Q_DECLARE_FLAGS(Extensions, Extension)

    static Extensions glExtensions;
    static void init(); // sys dependent
    static void init_extensions(); // general: called by init()
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QGLExtensions::Extensions)

/* NV_texture_rectangle */
#ifndef GL_NV_texture_rectangle
#define GL_TEXTURE_RECTANGLE_NV           0x84F5
#define GL_TEXTURE_BINDING_RECTANGLE_NV   0x84F6
#define GL_PROXY_TEXTURE_RECTANGLE_NV     0x84F7
#define GL_MAX_RECTANGLE_TEXTURE_SIZE_NV  0x84F8
#endif

#ifndef GL_BGRA
#define GL_BGRA 0x80E1
#endif

struct QGLThreadContext {
    QGLContext *context;
};
extern QThreadStorage<QGLThreadContext *> qgl_context_storage;
#endif // QGL_P_H
