//
// colour.cc
//
// Colour utility functions
//
// Copyright (c) J. Belson	1999.01.31
//
// $Author: jon $	:	$Date: 2003/05/21 11:40:09 $
//

#include "fcolour.h"
#include "colour.h"
#include "hf.h"
#include "types.h"

#include "settings.h"

static unsigned char palette[5][3] = {
						{ 222, 228, 244 },
						{  90, 100,  90 },
						{  82, 121,  57 }, /*{ 53, 52, 0},*/
						{  60, 100, 132 },  /*{ 85, 103, 158 },*/
						{  40,  40, 181 }  /*{ 89, 99, 148 }*/
};


const float SEA_LEVEL		= -0.1*256*0.15;
const float GRASS_LEVEL		= -0.01;//0.0;
const float MOUNTAIN_LEVEL	= 0.4*256*0.15;
const float SNOW_LEVEL		= 0.6*256*0.15;


/**
 * Prepare colour class to provide RGB information
 */
void colour::init_colour(void)
{
	uint8 r, g, b;

	fcolour col;
	settings::get_instance()->get_colour(WATER_COLOUR, &col);
	col.get_rgb8(&r, &g, &b);

	palette[3][0] = r;
	palette[3][1] = g;
	palette[3][2] = b;
}


/**
 * Calculate colour for specifed heightfield
 */
fcolour colour::get_colour_from_height(float height)
{
	uint8 r, g, b;

	if (height > SNOW_LEVEL) {
		height -= SNOW_LEVEL;
		r = palette[0][0];
		g = palette[0][1];
		b = palette[0][2];
	}
	else if (height > MOUNTAIN_LEVEL) {

		r = palette[1][0]; // + (10 - rand()%20);
		g = palette[1][1]; // + (10 - rand()%20);
		b = palette[1][2]; //+ (10 - rand()%20);
	}
	else if (height >= GRASS_LEVEL) {
		//int offset = rand()%10 + rand()%10;
		r = palette[2][0]; //+ (10 - rand()%20);
		g = palette[2][1] /*+ 3*offset*/;	//+ (5 - rand()%10);
		b = palette[2][2]; //+ (10 - rand()%20);
	}
	else if (height > SEA_LEVEL) {
		r = palette[3][0];
		g = palette[3][1];
		b = palette[3][2];
	}
	else {
		r = palette[4][0];
		g = palette[4][1];
		b = palette[4][2];
	}

	return fcolour(r/255.0, g/255.0, b/255.0);
}