/* Copyright (c) 2012-2015 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.chunky.world.BlockData;
import se.llbit.math.AABB;
import se.llbit.math.Quad;
import se.llbit.math.QuickMath;
import se.llbit.math.Ray;
import se.llbit.math.Vector3;
import se.llbit.math.Vector4;
public class GlassPaneModel {
private static AABB core = new AABB(7 / 16., 9 / 16., 0, 1, 7 / 16., 9 / 16.);
private static Quad[][] connector = {
// Front side.
{
// Left face.
new Quad(new Vector3(7 / 16., 1, 7 / 16.), new Vector3(7 / 16., 1, 0),
new Vector3(7 / 16., 0, 7 / 16.), new Vector4(7 / 16., 0, 1, 0)),
// Right face.
new Quad(new Vector3(9 / 16., 1, 0), new Vector3(9 / 16., 1, 7 / 16.),
new Vector3(9 / 16., 0, 0), new Vector4(0, 7 / 16., 1, 0)),
// Top face.
new Quad(new Vector3(9 / 16., 1, 0), new Vector3(7 / 16., 1, 0),
new Vector3(9 / 16., 1, 7 / 16.), new Vector4(9 / 16., 7 / 16., 0, 7 / 16.)),
// Bottom face.
new Quad(new Vector3(7 / 16., 0, 0), new Vector3(9 / 16., 0, 0),
new Vector3(7 / 16., 0, 7 / 16.), new Vector4(7 / 16., 9 / 16., 0, 7 / 16.)),
},
// Back side.
{
// Left face.
new Quad(new Vector3(7 / 16., 1, 1), new Vector3(7 / 16., 1, 9 / 16.),
new Vector3(7 / 16., 0, 1), new Vector4(1, 9 / 16., 1, 0)),
// Right face.
new Quad(new Vector3(9 / 16., 1, 9 / 16.), new Vector3(9 / 16., 1, 1),
new Vector3(9 / 16., 0, 9 / 16.), new Vector4(9 / 16., 1, 1, 0)),
// Top face.
new Quad(new Vector3(9 / 16., 1, 9 / 16.), new Vector3(7 / 16., 1, 9 / 16.),
new Vector3(9 / 16., 1, 1), new Vector4(9 / 16., 7 / 16., 9 / 16., 1)),
// Bottom face.
new Quad(new Vector3(7 / 16., 0, 9 / 16.), new Vector3(9 / 16., 0, 9 / 16.),
new Vector3(7 / 16., 0, 1), new Vector4(7 / 16., 9 / 16., 9 / 16., 1)),},};
private static Quad[][] panes = new Quad[4][];
static {
panes[0] = connector[0];
panes[1] = connector[1];
for (int j = 2; j < 4; ++j) {
panes[j] = Model.rotateY(connector[j - 2]);
}
}
public static boolean intersect(Ray ray, Texture sideTexture, Texture topTexture) {
int metadata = 0xF & (ray.getCurrentData() >> BlockData.GLASS_PANE_OFFSET);
boolean hit = false;
ray.t = Double.POSITIVE_INFINITY;
if (core.intersect(ray)) {
if (ray.n.y > 0 || ray.n.y < 0) {
topTexture.getColor(ray);
} else {
sideTexture.getColor(ray);
}
ray.n.scale(QuickMath.signum(-ray.d.dot(ray.n)));
ray.t = ray.tNext;
hit = true;
}
for (int i = 0; i < 4; ++i) {
if ((metadata & (1 << i)) != 0) {
for (int j = 0; j < panes[i].length; ++j) {
Quad quad = panes[i][j];
if (quad.intersect(ray)) {
if (j < 2) {
sideTexture.getColor(ray);
} else {
topTexture.getColor(ray);
}
ray.n.set(quad.n);
ray.t = ray.tNext;
hit = true;
}
}
}
}
if (hit) {
ray.distance += ray.t;
ray.o.scaleAdd(ray.t, ray.d);
}
return hit;
}
}