/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the QtOpenGL module of the Qt Toolkit.
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****************************************************************************/

#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) == EGL_DONT_CARE || f.redBufferSize() != -1)
        props.setValue(EGL_RED_SIZE, f.redBufferSize() == -1 ? 1 : f.redBufferSize());
    if (props.value(EGL_GREEN_SIZE) == EGL_DONT_CARE || f.greenBufferSize() != -1)
        props.setValue(EGL_GREEN_SIZE, f.greenBufferSize() == -1 ? 1 : f.greenBufferSize());
    if (props.value(EGL_BLUE_SIZE) == EGL_DONT_CARE || f.blueBufferSize() != -1)
        props.setValue(EGL_BLUE_SIZE, f.blueBufferSize() == -1 ? 1 : f.blueBufferSize());
    if (f.alpha()) {
        if (props.value(EGL_ALPHA_SIZE) == EGL_DONT_CARE || 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