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

**

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

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

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

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** 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

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

#ifndef QGLPIXELBUFFER_P_H

#define QGLPIXELBUFFER_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 "QtOpenGL/qglpixelbuffer.h"

#include <private/qgl_p.h>

#include <private/qglpaintdevice_p.h>

#if defined(Q_WS_X11) && !defined(QT_OPENGL_ES)

#include <GL/glx.h>

// The below is needed to for compilation on HPUX, due to broken GLX

// headers. Some of the systems define GLX_VERSION_1_3 without

// defining the GLXFBConfig structure, which is wrong.

#if defined (Q_OS_HPUX) && defined(QT_DEFINE_GLXFBCONFIG_STRUCT)

typedef unsigned long GLXPbuffer;

struct GLXFBConfig {

    int visualType;

    int transparentType;

                                /*    colors are floats scaled to ints */

    int transparentRed, transparentGreen, transparentBlue, transparentAlpha;

    int transparentIndex;

    int visualCaveat;

    int associatedVisualId;

    int screen;

    int drawableType;

    int renderType;

    int maxPbufferWidth, maxPbufferHeight, maxPbufferPixels;

    int optimalPbufferWidth, optimalPbufferHeight;  /* for SGIX_pbuffer */

    int visualSelectGroup;	/* visuals grouped by select priority */

    unsigned int id;

    GLboolean rgbMode;

    GLboolean colorIndexMode;

    GLboolean doubleBufferMode;

    GLboolean stereoMode;

    GLboolean haveAccumBuffer;

    GLboolean haveDepthBuffer;

    GLboolean haveStencilBuffer;

    /* The number of bits present in various buffers */

    GLint accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits;

    GLint depthBits;

    GLint stencilBits;

    GLint indexBits;

    GLint redBits, greenBits, blueBits, alphaBits;

    GLuint redMask, greenMask, blueMask, alphaMask;

    GLuint multiSampleSize;     /* Number of samples per pixel (0 if no ms) */

    GLuint nMultiSampleBuffers; /* Number of available ms buffers */

    GLint maxAuxBuffers;

    /* frame buffer level */

    GLint level;

    /* color ranges (for SGI_color_range) */

    GLboolean extendedRange;

    GLdouble minRed, maxRed;

    GLdouble minGreen, maxGreen;

    GLdouble minBlue, maxBlue;

    GLdouble minAlpha, maxAlpha;

};

#endif // Q_OS_HPUX

#elif defined(Q_WS_WIN)

DECLARE_HANDLE(HPBUFFERARB);

#elif defined(QT_OPENGL_ES_2)

#include <EGL/egl.h>

#elif defined(QT_OPENGL_ES)

#include <GLES/egl.h>

#endif

QT_END_INCLUDE_NAMESPACE

class QEglContext;

class QGLPBufferGLPaintDevice : public QGLPaintDevice

{

public:

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

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

    virtual QGLContext* context() const;

    virtual void endPaint();

    void setPBuffer(QGLPixelBuffer* pb);

private:

    QGLPixelBuffer* pbuf;

};

class QGLPixelBufferPrivate {

    Q_DECLARE_PUBLIC(QGLPixelBuffer)

public:

    QGLPixelBufferPrivate(QGLPixelBuffer *q) : q_ptr(q), invalid(true), qctx(0), pbuf(0), ctx(0)

    {

#ifdef Q_WS_WIN

        dc = 0;

#elif defined(Q_WS_MACX)

        share_ctx = 0;

#endif

    }

    bool init(const QSize &size, const QGLFormat &f, QGLWidget *shareWidget);

    void common_init(const QSize &size, const QGLFormat &f, QGLWidget *shareWidget);

    bool cleanup();

    QGLPixelBuffer *q_ptr;

    bool invalid;

    QGLContext *qctx;

    QGLPBufferGLPaintDevice glDevice;

    QGLFormat format;

    QGLFormat req_format;

    QPointer<QGLWidget> req_shareWidget;

    QSize req_size;

#if defined(Q_WS_X11) && !defined(QT_OPENGL_ES)

    GLXPbuffer pbuf;

    GLXContext ctx;

#elif defined(Q_WS_WIN)

    HDC dc;

    bool has_render_texture :1;

#if !defined(QT_OPENGL_ES)

    HPBUFFERARB pbuf;

    HGLRC ctx;

#endif

#elif defined(Q_WS_MACX)

#  ifdef QT_MAC_USE_COCOA

    void *pbuf;

    void *ctx;

    void *share_ctx;

#  else

    AGLPbuffer pbuf;

    AGLContext ctx;

    AGLContext share_ctx;

#  endif

#endif

#if defined(QT_OPENGL_ES)

    EGLSurface pbuf;

    QEglContext *ctx;

    int textureFormat;

#endif

};

QT_END_NAMESPACE

#endif // QGLPIXELBUFFER_P_H