//
// texture_skylight.cc
//
// Skylight texture.
//
// Copyright (C) J. Belson	2003.09.27
//
// $Id: texture_skylight.cc,v 1.1 2003/10/11 18:11:00 jon Exp $
//


#include "texture_skylight.h"


/**
 * Constructor.
 */
texture_skylight::texture_skylight(const textset_skylight& ts)
	: texture(ts)
{
	sky = new skylight(3.0);
	sky->set_sun_direction(ts.sun_direction);
	sun_direction = ts.sun_direction;
}


/**
 * Destructor.
 */
texture_skylight::~texture_skylight()
{
	delete sky;
}


/**
 * Calculate colour at specified point.
 * @param	s	Texture coordinate.
 * @param	t	Texture coordinate.
 * @param	u	Texture coordinate.
 * @return		Colour at specified point.
 */
fcolour texture_skylight::colour(float s, float t, float u, vector3d*)
{

if (u < 0) {
	return fcolour(0.0, 0.0, 0.0);
	u = 0;
}

	vector3d view_direction(s, u, t);
	view_direction.normalise();

	return sky->get_colour(view_direction);
}