/* Copyright (c) 2012 Jesper Öqvist <jesper@llbit.se>
*
* This file is part of Chunky.
*
* Chunky is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Chunky is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Chunky. If not, see <http://www.gnu.org/licenses/>.
*/
package se.llbit.chunky.world;
/**
* Stores the cloud bits from the cloud texture
*
* @author Jesper Öqvist <jesper@llbit.se>
*/
public class Clouds {
private static long[][] clouds = new long[32][32];
static {
// zero the cloud data
for (int i = 0; i < 32; ++i) {
for (int j = 0; j < 32; ++j) {
clouds[i][j] = 0L;
}
}
}
/**
* Get cloud bit at position (x, y)
*
* @return 0 = no cloud, 1 = cloud
*/
public static int getCloud(int x, int y) {
x = ((x % 256) + 256) % 256; // Compute modulo 256 >=0.
y = ((y % 256) + 256) % 256; // Compute modulo 256 >=0.
int tilex = x / 8;
int tiley = y / 8;
int subx = x & 7;
int suby = y & 7;
return (int) ((clouds[tilex][tiley] >>> (suby * 8 + subx)) & 1);
}
/**
* Set cloud bit at position (x, y)
*
* @param v 0 = no cloud, 1 = cloud
*/
public static void setCloud(int x, int y, int v) {
x = ((x % 256) + 256) % 256; // Compute modulo 256 >=0.
y = ((y % 256) + 256) % 256; // Compute modulo 256 >=0.
int tilex = x / 8;
int tiley = y / 8;
int subx = x & 7;
int suby = y & 7;
clouds[tilex][tiley] |= ((long) (v & 1)) << (suby * 8 + subx);
}
}