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

**

** 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.

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** $QT_END_LICENSE$

**

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

#include "qgl.h"

#include "qgl_egl_p.h"

#include "qglpixelbuffer.h"

#include <qglscreen_qws.h>

#include <qscreenproxy_qws.h>

#include <private/qglwindowsurface_qws_p.h>

#include <private/qbackingstore_p.h>

#include <private/qfont_p.h>

#include <private/qfontengine_p.h>

#include <private/qgl_p.h>

#include <private/qpaintengine_opengl_p.h>

#include <qpixmap.h>

#include <qtimer.h>

#include <qapplication.h>

#include <qstack.h>

#include <qdesktopwidget.h>

#include <qdebug.h>

#include <qvarlengtharray.h>

QT_BEGIN_NAMESPACE

static QGLScreen *glScreenForDevice(QPaintDevice *device)

{

    QScreen *screen = qt_screen;

    if (screen->classId() == QScreen::MultiClass) {

        int screenNumber;

        if (device && device->devType() == QInternal::Widget)

            screenNumber = qApp->desktop()->screenNumber(static_cast<QWidget *>(device));

        else

            screenNumber = 0;

        screen = screen->subScreens()[screenNumber];

    }

    while (screen->classId() == QScreen::ProxyClass ||

           screen->classId() == QScreen::TransformedClass) {

        screen = static_cast<QProxyScreen *>(screen)->screen();

    }

    if (screen->classId() == QScreen::GLClass)

        return static_cast<QGLScreen *>(screen);

    else

        return 0;

}

/*

    QGLTemporaryContext implementation

*/

class QGLTemporaryContextPrivate

{

public:

    QGLWidget *widget;

};

QGLTemporaryContext::QGLTemporaryContext(bool, QWidget *)

    : d(new QGLTemporaryContextPrivate)

{

    d->widget = new QGLWidget;

    d->widget->makeCurrent();

}

QGLTemporaryContext::~QGLTemporaryContext()

{

    delete d->widget;

}

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

  QOpenGL debug facilities

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

//#define DEBUG_OPENGL_REGION_UPDATE

bool QGLFormat::hasOpenGLOverlays()

{

    QGLScreen *glScreen = glScreenForDevice(0);

    if (glScreen)

        return (glScreen->options() & QGLScreen::Overlays);

    else

        return false;

}

static EGLSurface qt_egl_create_surface

    (QEglContext *context, QPaintDevice *device,

     const QEglProperties *properties = 0)

{

    // Get the screen surface functions, which are used to create native ids.

    QGLScreen *glScreen = glScreenForDevice(device);

    if (!glScreen)

        return EGL_NO_SURFACE;

    QGLScreenSurfaceFunctions *funcs = glScreen->surfaceFunctions();

    if (!funcs)

        return EGL_NO_SURFACE;

    // Create the native drawable for the paint device.

    int devType = device->devType();

    EGLNativePixmapType pixmapDrawable = 0;

    EGLNativeWindowType windowDrawable = 0;

    bool ok;

    if (devType == QInternal::Pixmap) {

        ok = funcs->createNativePixmap(static_cast<QPixmap *>(device), &pixmapDrawable);

    } else if (devType == QInternal::Image) {

        ok = funcs->createNativeImage(static_cast<QImage *>(device), &pixmapDrawable);

    } else {

        ok = funcs->createNativeWindow(static_cast<QWidget *>(device), &windowDrawable);

    }

    if (!ok) {

        qWarning("QEglContext::createSurface(): Cannot create the native EGL drawable");

        return EGL_NO_SURFACE;

    }

    // Create the EGL surface to draw into, based on the native drawable.

    const int *props;

    if (properties)

        props = properties->properties();

    else

        props = 0;

    EGLSurface surf;

    if (devType == QInternal::Widget) {

        surf = eglCreateWindowSurface

            (context->display(), context->config(), windowDrawable, props);

    } else {

        surf = eglCreatePixmapSurface

            (context->display(), context->config(), pixmapDrawable, props);

    }

    if (surf == EGL_NO_SURFACE)

        qWarning("QEglContext::createSurface(): Unable to create EGL surface, error = 0x%x", eglGetError());

    return surf;

}

bool QGLContext::chooseContext(const QGLContext* shareContext)

{

    Q_D(QGLContext);

    // Validate the device.

    if (!device())

        return false;

    int devType = device()->devType();

    if (devType != QInternal::Pixmap && devType != QInternal::Image && devType != QInternal::Widget) {

        qWarning("QGLContext::chooseContext(): Cannot create QGLContext's for paint device type %d", devType);

        return false;

    }

    // Get the display and initialize it.

    d->eglContext = new QEglContext();

    d->ownsEglContext = true;

    d->eglContext->setApi(QEgl::OpenGL);

    // Construct the configuration we need for this surface.

    QEglProperties configProps;

    qt_eglproperties_set_glformat(configProps, d->glFormat);

    configProps.setDeviceType(devType);

    configProps.setPaintDeviceFormat(device());

    configProps.setRenderableType(QEgl::OpenGL);

    // Search for a matching configuration, reducing the complexity

    // each time until we get something that matches.

    if (!d->eglContext->chooseConfig(configProps)) {

        delete d->eglContext;

        d->eglContext = 0;

        return false;

    }

    // Inform the higher layers about the actual format properties.

    qt_glformat_from_eglconfig(d->glFormat, d->eglContext->config());

    // Create a new context for the configuration.

    if (!d->eglContext->createContext

            (shareContext ? shareContext->d_func()->eglContext : 0)) {

        delete d->eglContext;

        d->eglContext = 0;

        return false;

    }

    d->sharing = d->eglContext->isSharing();

    if (d->sharing && shareContext)

        const_cast<QGLContext *>(shareContext)->d_func()->sharing = true;

#if defined(EGL_VERSION_1_1)

    if (d->glFormat.swapInterval() != -1 && devType == QInternal::Widget)

        eglSwapInterval(d->eglContext->display(), d->glFormat.swapInterval());

#endif

    // Create the EGL surface to draw into.  We cannot use

    // QEglContext::createSurface() because it does not have

    // access to the QGLScreen.

    d->eglSurface = qt_egl_create_surface(d->eglContext, device());

    if (d->eglSurface == EGL_NO_SURFACE) {

        delete d->eglContext;

        d->eglContext = 0;

        return false;

    }

    return true;

}

bool QGLWidget::event(QEvent *e)

{

    return QWidget::event(e);

}

void QGLWidget::resizeEvent(QResizeEvent *)

{

    Q_D(QGLWidget);

    if (!isValid())

        return;

    makeCurrent();

    if (!d->glcx->initialized())

        glInit();

    resizeGL(width(), height());

    //handle overlay

}

const QGLContext* QGLWidget::overlayContext() const

{

    return 0;

}

void QGLWidget::makeOverlayCurrent()

{

    //handle overlay

}

void QGLWidget::updateOverlayGL()

{

    //handle overlay

}

void QGLWidget::setContext(QGLContext *context, const QGLContext* shareContext, bool deleteOldContext)

{

    Q_D(QGLWidget);

    if(context == 0) {

        qWarning("QGLWidget::setContext: Cannot set null context");

        return;

    }

    if(d->glcx)

        d->glcx->doneCurrent();

    QGLContext* oldcx = d->glcx;

    d->glcx = context;

    if(!d->glcx->isValid())

        d->glcx->create(shareContext ? shareContext : oldcx);

    if(deleteOldContext)

        delete oldcx;

}

void QGLWidgetPrivate::init(QGLContext *context, const QGLWidget* shareWidget)

{

    Q_Q(QGLWidget);

    QGLScreen *glScreen = glScreenForDevice(q);

    if (glScreen) {

        wsurf = static_cast<QWSGLWindowSurface*>(glScreen->createSurface(q));

        q->setWindowSurface(wsurf);

    }

    initContext(context, shareWidget);

    if(q->isValid() && glcx->format().hasOverlay()) {

        //no overlay

        qWarning("QtOpenGL ES doesn't currently support overlays");

    }

}

void QGLWidgetPrivate::cleanupColormaps()

{

}

const QGLColormap & QGLWidget::colormap() const

{

    return d_func()->cmap;

}

void QGLWidget::setColormap(const QGLColormap &)

{

}

QT_END_NAMESPACE