//
// Handle rendering of sky
//
// Copyright (C) J. Belson	2001.12.08
//
// $Author: jon $ : $Date: 2003/10/11 18:11:00 $
//


#ifndef _SCENE_SKY_H_
#define _SCENE_SKY_H_

#include "fcolour.h"
#include "handler_base.h"
#include "hf.h"
#include "perlin.h"
#include "perlin2.h"
#include "point3d.h"
#include "texture.h"

#define USE_OLD_PERLIN



/**
 * Handle rendering of skydome
 */
class handler_sky : public handler_base {

private:
	hf*			skydome;

	texture*	tex;

	texture*	sky;
	texture*	cloud;

	fcolour horizon_colour;
	fcolour zenith_colour;
	bool	realistic_sky;

	point3d	sun_pos;

	fcolour	cloud_colour;
	float	persistence;
	float	presence;
	float	cloud_cover;
	float	scale;
	int		seed;

	bool	first;

	// Calculate height for specified point
	virtual float get_height(float x, float y);

	virtual void process_patch(const point3d& p1, const point3d& p2, const point3d& p3, const point3d& p4);

	// Calculate colour for point on skydome
	fcolour get_colour(const point3d& p);

	// Check if triangle is sea
	bool check_sea_level(triangle3d& t, const point3d* pnt3d);

	// Calcualate sun position from light vector
	point3d calc_sun_pos(void);

	enum {
		SKYDOME_OFFSET	= 40,
		SKYDOME_SCALE	= 70
	};

public:
	handler_sky(int w, int h, const render_info& info);
	~handler_sky();

	virtual void render(void);

	// Don't need this for skydome since it's not a fractal
	virtual void set_heightfield(hfield*) {}

	friend class handler_land;
};

#endif	// _SCENE_SKY_H_