/* 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.model;
import se.llbit.chunky.resources.Texture;
import se.llbit.math.AABB;
import se.llbit.math.QuickMath;
import se.llbit.math.Ray;
import se.llbit.math.Triangle;
/**
* A lava block. The height the top lava block is slightly lower
* than a regular block.
*
* @author Jesper Öqvist <jesper@llbit.se>
*/
public class LavaModel {
private static AABB fullBlock = new AABB(0, 1, 0, 1, 0, 1);
public static boolean intersect(Ray ray) {
ray.t = Double.POSITIVE_INFINITY;
int data = ray.getCurrentData();
int isFull = (data >> WaterModel.FULL_BLOCK) & 1;
if (isFull != 0) {
if (fullBlock.intersect(ray)) {
Texture.lava.getColor(ray);
ray.distance += ray.tNext;
ray.o.scaleAdd(ray.tNext, ray.d);
return true;
}
return false;
}
int c0 = (0xF & (data >> 16)) % 8;
int c1 = (0xF & (data >> 20)) % 8;
int c2 = (0xF & (data >> 24)) % 8;
int c3 = (0xF & (data >> 28)) % 8;
Triangle triangle = WaterModel.t012[c0][c1][c2];
boolean hit = false;
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
hit = true;
}
triangle = WaterModel.t230[c2][c3][c0];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
ray.u = 1 - ray.u;
ray.v = 1 - ray.v;
hit = true;
}
triangle = WaterModel.westt[c0][c3];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double y = ray.t * ray.d.y + ray.o.y;
double z = ray.t * ray.d.z + ray.o.z;
y -= QuickMath.floor(y);
z -= QuickMath.floor(z);
ray.u = z;
ray.v = y;
hit = true;
}
triangle = WaterModel.westb[c0];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double y = ray.t * ray.d.y + ray.o.y;
double z = ray.t * ray.d.z + ray.o.z;
y -= QuickMath.floor(y);
z -= QuickMath.floor(z);
ray.u = z;
ray.v = y;
hit = true;
}
triangle = WaterModel.eastt[c1][c2];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double y = ray.t * ray.d.y + ray.o.y;
double z = ray.t * ray.d.z + ray.o.z;
y -= QuickMath.floor(y);
z -= QuickMath.floor(z);
ray.u = z;
ray.v = y;
hit = true;
}
triangle = WaterModel.eastb[c1];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double y = ray.t * ray.d.y + ray.o.y;
double z = ray.t * ray.d.z + ray.o.z;
y -= QuickMath.floor(y);
z -= QuickMath.floor(z);
ray.u = z;
ray.v = y;
hit = true;
}
triangle = WaterModel.southt[c0][c1];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double x = ray.t * ray.d.x + ray.o.x;
double y = ray.t * ray.d.y + ray.o.y;
x -= QuickMath.floor(x);
y -= QuickMath.floor(y);
ray.u = x;
ray.v = y;
hit = true;
}
triangle = WaterModel.southb[c1];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double x = ray.t * ray.d.x + ray.o.x;
double y = ray.t * ray.d.y + ray.o.y;
x -= QuickMath.floor(x);
y -= QuickMath.floor(y);
ray.u = x;
ray.v = y;
hit = true;
}
triangle = WaterModel.northt[c2][c3];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double x = ray.t * ray.d.x + ray.o.x;
double y = ray.t * ray.d.y + ray.o.y;
x -= QuickMath.floor(x);
y -= QuickMath.floor(y);
ray.u = 1 - x;
ray.v = y;
hit = true;
}
triangle = WaterModel.northb[c2];
if (triangle.intersect(ray)) {
ray.n.set(triangle.n);
ray.n.scale(QuickMath.signum(-ray.d.dot(triangle.n)));
ray.t = ray.tNext;
double x = ray.t * ray.d.x + ray.o.x;
double y = ray.t * ray.d.y + ray.o.y;
x -= QuickMath.floor(x);
y -= QuickMath.floor(y);
ray.u = 1 - x;
ray.v = y;
hit = true;
}
if (hit) {
Texture.lava.getColor(ray);
ray.color.w = 1;
ray.distance += ray.tNext;
ray.o.scaleAdd(ray.tNext, ray.d);
return true;
}
return false;
}
}