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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtOpenGL/qgl.h>
#include "qgl_egl_p.h"

QT_BEGIN_NAMESPACE

// Set device configuration attributes from a QGLFormat instance.
void qt_egl_set_format(QEglProperties& props, int deviceType, const QGLFormat& f)
{
    if (deviceType == QInternal::Pixmap || deviceType == QInternal::Image)
        props.setValue(EGL_SURFACE_TYPE, EGL_PIXMAP_BIT);
    else if (deviceType == QInternal::Pbuffer)
        props.setValue(EGL_SURFACE_TYPE, EGL_PBUFFER_BIT);
    else
        props.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);

    // Set the pixel format to that contained in the QGLFormat
    // if the system hasn't already chosen a fixed format to
    // match the pixmap, widget, etc.
    if (props.value(EGL_RED_SIZE) == 0 || f.redBufferSize() != -1)
        props.setValue(EGL_RED_SIZE, f.redBufferSize() == -1 ? 1 : f.redBufferSize());
    if (props.value(EGL_GREEN_SIZE) == 0 || f.greenBufferSize() != -1)
        props.setValue(EGL_GREEN_SIZE, f.greenBufferSize() == -1 ? 1 : f.greenBufferSize());
    if (props.value(EGL_BLUE_SIZE) == 0 || f.blueBufferSize() != -1)
        props.setValue(EGL_BLUE_SIZE, f.blueBufferSize() == -1 ? 1 : f.blueBufferSize());
    if (f.alpha()) {
        if (props.value(EGL_ALPHA_SIZE) == 0 || f.alphaBufferSize() != -1)
            props.setValue(EGL_ALPHA_SIZE, f.alphaBufferSize() == -1 ? 1 : f.alphaBufferSize());
    }

    if (f.depth())
        props.setValue(EGL_DEPTH_SIZE, f.depthBufferSize() == -1 ? 1 : f.depthBufferSize());
    if (f.stencil())
        props.setValue(EGL_STENCIL_SIZE, f.stencilBufferSize() == -1 ? 1 : f.stencilBufferSize());
    if (f.sampleBuffers()) {
        props.setValue(EGL_SAMPLE_BUFFERS, 1);
        props.setValue(EGL_SAMPLES, f.samples());
    } else {
        props.setValue(EGL_SAMPLE_BUFFERS, 0);
    }
    if (deviceType == QInternal::Widget)
        props.setValue(EGL_LEVEL, f.plane());
}

// Updates "format" with the parameters of the selected configuration.
void qt_egl_update_format(const QEglContext& context, QGLFormat& format)
{
    EGLint value = 0;

    if (context.configAttrib(EGL_RED_SIZE, &value))
        format.setRedBufferSize(value);
    if (context.configAttrib(EGL_GREEN_SIZE, &value))
        format.setGreenBufferSize(value);
    if (context.configAttrib(EGL_BLUE_SIZE, &value))
        format.setBlueBufferSize(value);
    if (context.configAttrib(EGL_ALPHA_SIZE, &value)) {
        format.setAlpha(value != 0);
        if (format.alpha())
            format.setAlphaBufferSize(value);
    }

    if (context.configAttrib(EGL_DEPTH_SIZE, &value)) {
        format.setDepth(value != 0);
        if (format.depth())
            format.setDepthBufferSize(value);
    }

    if (context.configAttrib(EGL_LEVEL, &value))
        format.setPlane(value);

    if (context.configAttrib(EGL_SAMPLE_BUFFERS, &value)) {
        format.setSampleBuffers(value != 0);
        if (format.sampleBuffers()) {
            context.configAttrib(EGL_SAMPLES, &value);
            format.setSamples(value);
        }
    }

    if (context.configAttrib(EGL_STENCIL_SIZE, &value)) {
        format.setStencil(value != 0);
        if (format.stencil())
            format.setStencilBufferSize(value);
    }

    // Clear the EGL error state because some of the above may
    // have errored out because the attribute is not applicable
    // to the surface type.  Such errors don't matter.
    context.clearError();
}

QT_END_NAMESPACE