/****************************************************************************
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** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt3D module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL3$
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** accordance with the commercial license agreement provided with the
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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
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****************************************************************************/

#ifndef QT3DCORE_CAMERALENS_P_H
#define QT3DCORE_CAMERALENS_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <Qt3DCore/private/qcomponent_p.h>
#include "qcameralens.h"

#include <Qt3DCore/qscenepropertychange.h>

#include <QtGui/qmatrix4x4.h>

QT_BEGIN_NAMESPACE

namespace Qt3DCore {

class QCameraLensPrivate : public QComponentPrivate
{
public:
    QCameraLensPrivate();

    inline void updateProjectionMatrix()
    {
        switch (m_projectionType) {
        case QCameraLens::OrthographicProjection:
            updateOrthographicProjection();
            break;
        case QCameraLens::PerspectiveProjection:
            updatePerpectiveProjection();
            break;
        case QCameraLens::FrustumProjection:
            updateFrustumProjection();
            break;
        }
    }

    Q_DECLARE_PUBLIC(QCameraLens)

    QCameraLens::ProjectionType m_projectionType;

    float m_nearPlane;
    float m_farPlane;

    float m_fieldOfView;
    float m_aspectRatio;

    float m_left;
    float m_right;
    float m_bottom;
    float m_top;

    mutable QMatrix4x4 m_projectionMatrix;

private:
    inline void updatePerpectiveProjection()
    {
        Q_Q(QCameraLens);
        m_projectionMatrix.setToIdentity();
        m_projectionMatrix.perspective(m_fieldOfView, m_aspectRatio, m_nearPlane, m_farPlane);
        Q_EMIT q->projectionMatrixChanged(m_projectionMatrix);
    }

    inline void updateOrthographicProjection()
    {
        Q_Q(QCameraLens);
        m_projectionMatrix.setToIdentity();
        m_projectionMatrix.ortho(m_left, m_right, m_bottom, m_top, m_nearPlane, m_farPlane);
        Q_EMIT q->projectionMatrixChanged(m_projectionMatrix);
    }

    inline void updateFrustumProjection()
    {
        Q_Q(QCameraLens);
        m_projectionMatrix.setToIdentity();
        m_projectionMatrix.frustum(m_left, m_right, m_bottom, m_top, m_nearPlane, m_farPlane);
        Q_EMIT q->projectionMatrixChanged(m_projectionMatrix);
    }
};

} // namespace Qt3DCore

QT_END_NAMESPACE

#endif // QT3DCORE_CAMERALENS_P_H
