Lighting.h

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/* Copyright © 2010 James Legg.
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
*/

#ifndef LIBTRACK_LIGHTING_H_
#define LIBTRACK_LIGHTING_H_

#include <istream>
#include <ostream>
#include <vector>

namespace Track
{

struct LightSettings
{
    LightSettings();
    LightSettings(std::istream & in);
    float position[4];
    float colour[4];
    bool operator == (const LightSettings & other) const;
};

std::ostream & operator<<(std::ostream & destination, const LightSettings & light_settings);

struct FogSettings
{
    FogSettings();
    FogSettings(std::istream & in);
    float colour[4];
    float density;
    bool enabled;
    bool operator != (const FogSettings & other) const;
};

std::ostream & operator<<(std::ostream & destination, const FogSettings & fog_settings);

class Lighting
{
    public:
        // Initalise to sensible defaults.
        Lighting();
        
        Lighting(std::istream & in);
        
        void prepare_render() const;
        
        void initalise() const;
        
        void set_lights(const std::vector<LightSettings> & lights);
        const std::vector<LightSettings> & get_lights() const;
        
        void set_ambient(float colour[4]);
        const float * get_ambient_light() const;
        
        void set_fog(const FogSettings & fog);
        const FogSettings & get_fog() const;
        
        bool operator!=(const Lighting & other) const;
    private:
        std::vector<LightSettings> m_lights;
        FogSettings m_fog;
        float m_ambient_light[4];
};

std::ostream & operator<<(std::ostream & destination, const Lighting & lighting);

} // Track namespace

#endif // LIBTRACK_LIGHTING_H_

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