/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** following information to ensure the GNU Lesser General Public License
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**
** In addition, as a special exception, Digia gives you certain additional
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****************************************************************************/

#include "qeglfsintegration.h"

#include "qeglfswindow.h"
#include "qeglfshooks.h"
#include "qeglfscontext.h"
#include "qeglfsoffscreenwindow.h"

#include <QtGui/private/qguiapplication_p.h>

#include <QtPlatformSupport/private/qeglconvenience_p.h>
#include <QtPlatformSupport/private/qeglplatformcontext_p.h>
#include <QtPlatformSupport/private/qeglpbuffer_p.h>
#include <QtPlatformHeaders/QEGLNativeContext>

#include <qpa/qplatformwindow.h>
#include <QtGui/QSurfaceFormat>
#include <QtGui/QOpenGLContext>
#include <QtGui/QScreen>
#include <QtGui/QOffscreenSurface>
#include <qpa/qplatformcursor.h>

#include <EGL/egl.h>

static void initResources()
{
    Q_INIT_RESOURCE(cursor);
}

QT_BEGIN_NAMESPACE

QEglFSIntegration::QEglFSIntegration()
{
    mDisableInputHandlers = qEnvironmentVariableIntValue("QT_QPA_EGLFS_DISABLE_INPUT");

    initResources();
}

bool QEglFSIntegration::hasCapability(QPlatformIntegration::Capability cap) const
{
    // We assume that devices will have more and not less capabilities
    if (QEglFSHooks::hooks() && QEglFSHooks::hooks()->hasCapability(cap))
        return true;

    return QEGLPlatformIntegration::hasCapability(cap);
}

void QEglFSIntegration::addScreen(QPlatformScreen *screen)
{
    screenAdded(screen);
}

void QEglFSIntegration::initialize()
{
    QEglFSHooks::hooks()->platformInit();

    QEGLPlatformIntegration::initialize();

    if (!mDisableInputHandlers)
        createInputHandlers();

    QEglFSHooks::hooks()->screenInit();
}

void QEglFSIntegration::destroy()
{
    QEglFSHooks::hooks()->screenDestroy();
    QEGLPlatformIntegration::destroy();
    QEglFSHooks::hooks()->platformDestroy();
}

EGLNativeDisplayType QEglFSIntegration::nativeDisplay() const
{
    return QEglFSHooks::hooks()->platformDisplay();
}

QEGLPlatformWindow *QEglFSIntegration::createWindow(QWindow *window) const
{
    return new QEglFSWindow(window);
}

QEGLPlatformContext *QEglFSIntegration::createContext(const QSurfaceFormat &format,
                                                      QPlatformOpenGLContext *shareContext,
                                                      EGLDisplay display,
                                                      QVariant *nativeHandle) const
{
    QEglFSContext *ctx;
    QSurfaceFormat adjustedFormat = QEglFSHooks::hooks()->surfaceFormatFor(format);
    if (!nativeHandle || nativeHandle->isNull()) {
        EGLConfig config = QEglFSIntegration::chooseConfig(display, adjustedFormat);
        ctx = new QEglFSContext(adjustedFormat, shareContext, display, &config, QVariant());
    } else {
        ctx = new QEglFSContext(adjustedFormat, shareContext, display, 0, *nativeHandle);
    }
    *nativeHandle = QVariant::fromValue<QEGLNativeContext>(QEGLNativeContext(ctx->eglContext(), display));
    return ctx;
}

QPlatformOffscreenSurface *QEglFSIntegration::createOffscreenSurface(EGLDisplay display,
                                                                     const QSurfaceFormat &format,
                                                                     QOffscreenSurface *surface) const
{
    QSurfaceFormat fmt = QEglFSHooks::hooks()->surfaceFormatFor(format);
    if (QEglFSHooks::hooks()->supportsPBuffers())
        return new QEGLPbuffer(display, fmt, surface);
    else
        return new QEglFSOffscreenWindow(display, fmt, surface);

    // Never return null. Multiple QWindows are not supported by this plugin.
}

EGLConfig QEglFSIntegration::chooseConfig(EGLDisplay display, const QSurfaceFormat &format)
{
    class Chooser : public QEglConfigChooser {
    public:
        Chooser(EGLDisplay display, QEglFSHooks *hooks)
            : QEglConfigChooser(display)
            , m_hooks(hooks)
        {
        }

    protected:
        bool filterConfig(EGLConfig config) const Q_DECL_OVERRIDE
        {
            return m_hooks->filterConfig(display(), config) && QEglConfigChooser::filterConfig(config);
        }

    private:
        QEglFSHooks *m_hooks;
    };

    Chooser chooser(display, QEglFSHooks::hooks());
    chooser.setSurfaceFormat(format);
    return chooser.chooseConfig();
}

QT_END_NAMESPACE