/*
   render/state.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_RENDER_STATE_H__
#define __INCLUDED_RENDER_STATE_H__

#include "core/entity.h"
#include "render/gl.h"

namespace render
{

class State
{
public:
	/* ---- render context ------------------------------------- */
	
	/**
	 * @brief Initialize the render state
	 **/
	static void init(int width, int height);
	
	/**
	 * @brief Initialize the render state
	 **/
	static void shutdown();

	/**
	 * @brief Resize the render context
	 **/
	static void resize(int width, int height);
	
	/**
	 * @brief Clear the render context state
	 **/
	static void clear();
	
	/* ---- material context ----------------------------------- */
	
	/**
	 * @brief Reset the material context
	 **/
	static void reset();

	/**
	 * @brief Set the primary color of the material context
	 * set_color() should be used before calling set_material().
	 **/
	static void set_color(const math::Color & color);
	
	/**
	 * @brief Set the secondary color of the material context
	 * set_color_second() should be used before calling set_material().
	 **/
	static void set_color_second(const math::Color & color);
	
	/**
	 * @brief Set the engine color of the material context
	 * set_color_engine() should be used before calling set_material().
	 **/
	static void set_color_engine(const math::Color & color);
	
	/**
	 * @brief Copy primary, secondary and engine color from an entity
	 * set_color() should be used before calling set_material().
	 **/
	static void set_color(const core::Entity *entity);
	
	/**
	 * @brief set the power state for materials with Bright and Engine flags
	 */
	static void set_power(const bool power);
			
	/**
	 * @brief set the material layer context
	 * use_material_layer() will alter the current render context according to the settings
	 * defined by the material layer. If the material uses primary, secondary or engine color,
	 * the current state context colors will be used.
	 **/	
	static void use_material_layer(const model::Material * material, const model::Layer *layer);
	
	
	inline static int width()
	{
		return state_width;
	}
	
	inline static int height()
	{
		return state_height;
	}
	
	inline static float aspect()
	{
		return state_aspect;
	}
	
	inline static bool has_generate_mipmaps()
	{
		return state_has_generate_mipmaps;
	}
	
	inline static bool has_vbo()
	{
		return state_has_vbo;
	}
	
	inline static GLuint vbo()
	{
		return state_vbo;
	}
	
	inline static int max_lights()
	{
		return state_maxlights;
	}
	
	inline static int max_textureunits()
	{
		return state_maxtextureunits;
	}

	static void set_normalize(const bool enable=true);
	
private:
	static int	state_width;
	static int 	state_height;

	static float	state_aspect;
	static bool	state_has_generate_mipmaps;
	static bool	state_has_vbo;
	static GLuint	state_vbo;
	static int	state_maxlights;
	static int	state_maxtextureunits;
	static size_t	state_logo_texture_id;
	
	static math::Color	state_color_primary;	// current primary color
	static math::Color	state_color_secondary;	// current secondary color
	static math::Color	state_color_engine;	// current secondary color
	
	static bool		state_power;		// power state indicator
	
};
} // namespace render

#endif // __INCLUDED_RENDER_STATE_H__