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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, 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
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****************************************************************************/

#ifndef QGLLIGHTPARAMETERS_H
#define QGLLIGHTPARAMETERS_H

#include <Qt3D/qt3dglobal.h>
#include <QtCore/qobject.h>
#include <QtGui/qcolor.h>
#include <QtGui/qvector3d.h>
#include <QtGui/qvector4d.h>

QT_BEGIN_NAMESPACE

class QGLLightParametersPrivate;
class QMatrix4x4;

class Q_QT3D_EXPORT QGLLightParameters : public QObject
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QGLLightParameters)
    Q_ENUMS(LightType)
    Q_PROPERTY(LightType type READ type)
    Q_PROPERTY(QVector3D position READ position WRITE setPosition NOTIFY positionChanged)
    Q_PROPERTY(QVector3D direction READ direction WRITE setDirection NOTIFY directionChanged)
    Q_PROPERTY(QColor ambientColor READ ambientColor WRITE setAmbientColor NOTIFY ambientColorChanged)
    Q_PROPERTY(QColor diffuseColor READ diffuseColor WRITE setDiffuseColor NOTIFY diffuseColorChanged)
    Q_PROPERTY(QColor specularColor READ specularColor WRITE setSpecularColor NOTIFY specularColorChanged)
    Q_PROPERTY(QVector3D spotDirection READ spotDirection WRITE setSpotDirection NOTIFY spotDirectionChanged)
    Q_PROPERTY(float spotExponent READ spotExponent WRITE setSpotExponent NOTIFY spotExponentChanged)
    Q_PROPERTY(float spotAngle READ spotAngle WRITE setSpotAngle NOTIFY spotAngleChanged)
    Q_PROPERTY(float constantAttenuation READ constantAttenuation WRITE setConstantAttenuation NOTIFY constantAttenuationChanged)
    Q_PROPERTY(float linearAttenuation READ linearAttenuation WRITE setLinearAttenuation NOTIFY linearAttenuationChanged)
    Q_PROPERTY(float quadraticAttenuation READ quadraticAttenuation WRITE setQuadraticAttenuation NOTIFY quadraticAttenuationChanged)
public:
    enum LightType {
        Directional,
        Positional
    };

    QGLLightParameters(QObject *parent = 0);
    ~QGLLightParameters();

    QGLLightParameters::LightType type() const;

    QVector3D position() const;
    void setPosition(const QVector3D& value);

    QVector3D direction() const;
    void setDirection(const QVector3D& value);

    QColor ambientColor() const;
    void setAmbientColor(const QColor& value);

    QColor diffuseColor() const;
    void setDiffuseColor(const QColor& value);

    QColor specularColor() const;
    void setSpecularColor(const QColor& value);

    QVector3D spotDirection() const;
    void setSpotDirection(const QVector3D& value);

    float spotExponent() const;
    void setSpotExponent(float value);

    float spotAngle() const;
    void setSpotAngle(float value);

    float spotCosAngle() const;

    float constantAttenuation() const;
    void setConstantAttenuation(float value);

    float linearAttenuation() const;
    void setLinearAttenuation(float value);

    float quadraticAttenuation() const;
    void setQuadraticAttenuation(float value);

    QVector4D eyePosition(const QMatrix4x4& transform) const;
    QVector3D eyeSpotDirection(const QMatrix4x4& transform) const;

Q_SIGNALS:
    void positionChanged();
    void directionChanged();
    void ambientColorChanged();
    void diffuseColorChanged();
    void specularColorChanged();
    void spotDirectionChanged();
    void spotExponentChanged();
    void spotAngleChanged();
    void constantAttenuationChanged();
    void linearAttenuationChanged();
    void quadraticAttenuationChanged();
    void lightChanged();

private:
    Q_DISABLE_COPY(QGLLightParameters)

    QScopedPointer<QGLLightParametersPrivate> d_ptr;
};

QT_END_NAMESPACE

#endif