TallGrassModel.java

/* 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.renderer.scene.Scene;
import se.llbit.chunky.resources.Texture;
import se.llbit.math.Quad;
import se.llbit.math.Ray;

public class TallGrassModel extends SpriteModel {
  private static final Texture[] tex = {Texture.deadBush, Texture.tallGrass, Texture.fern};

  public static boolean intersect(Ray ray, Scene scene) {
    boolean hit = false;
    ray.t = Double.POSITIVE_INFINITY;
    for (Quad quad : quads) {
      if (quad.intersect(ray)) {
        int kind = ray.getBlockData() % 3;
        float[] color = tex[kind].getColor(ray.u, ray.v);
        if (color[3] > Ray.EPSILON) {
          ray.color.set(color);
          if (kind != 0) {
            float[] biomeColor = ray.getBiomeGrassColor(scene);
            ray.color.x *= biomeColor[0];
            ray.color.y *= biomeColor[1];
            ray.color.z *= biomeColor[2];
          }
          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;
  }
}