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

#include <assert.h>
#include "texture_rough.h"


/**
 * Constructor.
 */
texture_rough::texture_rough(const textset_noise& ts)
	: texture(ts)
{
	noise = new perlin;
	noise->set_seed(ts.seed);
	noise->set_freq_scale(10.0);
	noise->set_persistence(ts.persistence);
}


/**
 * Deonstructor.
 */
texture_rough::~texture_rough()
{
	delete noise;
}


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

	float val = noise->perlin_noise_2d(s, t);
	//float mixer = texture::smooth_step(val, -0.4, 0.4);

	// Use mixer to alphablend
	//float blend_r = 0.32;	//0.47;
	//float blend_g = 0.38;	//0.52;
	//float blend_b = 0.20;	//0.25;

	float r = 150/255.0;
	float g = 125/255.0;
	float b = 100/255.0;

//	r = (1.0 - mixer)*r + (mixer)*blend_r;
//	g = (1.0 - mixer)*g + (mixer)*blend_g;
//	b = (1.0 - mixer)*b + (mixer)*blend_b;

	val /= 3.0;

	// Perturb normal vector according to val
	normal->i += val;
	normal->j += val;
	normal->k += val;

	normal->normalise();

	return fcolour(r, g, b);
}