/*
   model/material.h
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#ifndef __INCLUDED_MODEL_LAYER_H__
#define __INCLUDED_MODEL_LAYER_H__

#include "math/color.h"

namespace model
{

/**
 * @brief a single layer within a material
 * */
class Layer {
public:
	/**
	 * @brief color generation type definition
	 * */
	enum RGBGen { 
		RGBGenIdentity = 1, 		// unmodified
		RGBGenColor = 2, 		// modified by layer color
		RGBGenEngine = 3, 		// modified by engine color
		RGBGenPrimary = 4, 		// modified by primary entity color
		RGBGenSecondary = 5, 		// modified by secondary entity color
		RGBGenTertiary = 6 		// modified by tertiary entity color
	};
	
	/**
	 * @brief texture coordinate generation type definition
	 * */
	enum TCGen {
		TCGenNone = 0, 			// no texture coordinate generation
		TCGenTexCoords = 1, 		// use texture coordinates from vertex array
		TCGenEnvironment = 2 		// texture coordinates generated by GL_SPHERE_MAP/GL_REFLECTION_MAP
	};
	
	/**
	 * @brief texture map type definition
	 * */
	enum TexMap {
		TexMapNone = 0,			// no texture map
		TexMapImage = 1,		// texture map from image
		TexMapEnvironment = 2,		// texture map with skybox
		TexMapLogo = 3			// use current logo texture
	};

	/**
	 * @brief default constructor
	 * */
	Layer();
	
	/**
	 * @brief default destructor
	 * */
	~Layer();
	
	/* ---- inspectors ----------------------------------------- */

	/**
	 * @brief rgb color generation source for this material layer
	 * */
	inline const RGBGen rgbgen() const
	{
		return layer_rgbgen;
	}
	
	/**
	 * @brief layer color
	 * The layer color is used if color source if rgbgen() is set to RGBGenColor
	 * */
	inline const math::Color & color() const
	{
		return layer_color;
	}

	/**
	 * @brief layer texture map
	 */
	const TexMap texmap() const
	{
		return layer_texmap;
	}
	
	/**
	 * @brief layer texture map name
	 * The layer texture mapa name is used if texmap() is set to TexMapTexture
	 * */
	inline const std::string &texture_name() const
	{
		return layer_texture_name;
	}

	/**
	 * @brief layer texture map renderer id
	 * */
	inline const size_t texture_id() const
	{
		return layer_texture_id;
	}

	/**
	 * @brief texture coordinates generation source for this material layer
	 * */
	inline const TCGen tcgen() const
	{
		return layer_tcgen;
	}
		
	/* ---- mutators ------------------------------------------- */
	
	/**
	 * @brief set rgb color generation source
	 * */
	void set_rgbgen(const RGBGen rgbgen);
	
	/**
	 * @brief set layer color
	 * */
	void set_color(const math::Color & color);
	
	/**
	 * @brief set texture coordinates generation source
	 * */
	void set_tcgen(const TCGen tcgen);

private:
	RGBGen		layer_rgbgen;
	math::Color	layer_color;
	
	TexMap		layer_texmap;
	std::string	layer_texture_name;
	size_t		layer_texture_id;
		
	TCGen		layer_tcgen;
};
	
} // namespace model

#endif // __INCLUDED_MODEL_LAYER_H__