glc_light.h

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/****************************************************************************

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 http://glc-lib.sourceforge.net

 GLC-lib is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 3 of the License, or
 (at your option) any later version.

 GLC-lib is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with GLC-lib; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*****************************************************************************/


#ifndef GLC_LIGHT_H_
#define GLC_LIGHT_H_

#include <QColor>
#include <QSet>
#include <QHash>

#include "../glc_object.h"
#include "../maths/glc_vector3d.h"

#include "../glc_config.h"

class QGLContext;




class GLC_LIB_EXPORT GLC_Light : public GLC_Object
{
public:
        enum LightType
        {
                LightPosition= 0,
                LightDirection= 1,
                LightSpot= 2
        };


public:

        GLC_Light(const QGLContext* pContext= NULL, const QColor& color= Qt::white);


        GLC_Light(LightType lightType, const QGLContext* pContext= NULL, const QColor& color= Qt::white);

        GLC_Light(const GLC_Light& light);

        virtual ~GLC_Light(void);



public:
        static int maxLightCount();

        static int builtAbleLightCount(QGLContext* pContext);

        inline GLC_Point3d position(void) const
        {return m_Position;}

        inline QColor ambientColor() const
        {return m_AmbientColor;}

        inline QColor diffuseColor() const
        { return m_DiffuseColor;}

        inline QColor specularColor() const
        {return m_SpecularColor;}

        inline bool isTwoSided() const
        {return m_TwoSided;}

        inline LightType type() const
        {return m_LightType;}

        inline GLenum openglID() const
        {return m_LightID;}

        inline GLfloat constantAttenuation() const
        {return m_ConstantAttenuation;}

        inline GLfloat linearAttenuation() const
        {return m_LinearAttenuation;}

        inline GLfloat quadraticAttenuation() const
        {return m_QuadraticAttenuation;}

        inline GLC_Vector3d spotDirection() const
        {return m_SpotDirection;}

        inline GLfloat spotCutoffAngle() const
        {return m_SpotCutoffAngle;}

        inline GLfloat spotEponent() const
        {return m_SpotExponent;}



public:
        void initForThisContext();

        void setPosition(const GLC_Point3d &pos);

        void setPosition(GLfloat x, GLfloat y, GLfloat z);

        void setAmbientColor(const QColor &color);

        void setDiffuseColor(const QColor &color);

        void setSpecularColor(const QColor &color);

        void setTwoSided(const bool mode);

        void setConstantAttenuation(GLfloat constantAttenuation);

        void setLinearAttenuation(GLfloat linearAttenuation);

        void setQuadraticAttenuation(GLfloat quadraticAttenuation);

        void setSpotDirection(const GLC_Vector3d& direction);

        void setSpotCutoffAngle(GLfloat cutoffAngle);

        void setSpotEponent(GLfloat exponent);




public:
        void enable();

        // Disable the light
        void disable();

        virtual void glExecute(GLenum Mode= GL_COMPILE_AND_EXECUTE);




private:
        void glDraw();

        void creationList(GLenum Mode);

        void deleteList();


// Private services fonction
private:
        void addNewLight();

        void removeThisLight();

// Private Members
private:
        GLenum m_LightID;

        LightType m_LightType;

        GLuint m_ListID;

        bool m_ListIsValid;

        QColor m_AmbientColor;
        QColor m_DiffuseColor;
        QColor m_SpecularColor;

        GLC_Point3d m_Position;

        GLC_Vector3d m_SpotDirection;

        GLfloat m_SpotExponent;

        GLfloat m_SpotCutoffAngle;

        GLfloat m_ConstantAttenuation;

        GLfloat m_LinearAttenuation;

        GLfloat m_QuadraticAttenuation;

        bool m_TwoSided;

        // Static member
        static GLint m_MaxLight;

        QGLContext* m_pContext;

        static QHash<const QGLContext*, QSet<GLenum> > m_ContextToFreeLightSet;
};
#endif //GLC_LIGHT_H_