1/*
2 * Copyright (c) 2009-2010 jMonkeyEngine
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 *   notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
17 *   may be used to endorse or promote products derived from this software
18 *   without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33package com.jme3.terrain.geomipmap.lodcalc;
34
35import com.jme3.export.InputCapsule;
36import com.jme3.export.JmeExporter;
37import com.jme3.export.JmeImporter;
38import com.jme3.export.OutputCapsule;
39import com.jme3.terrain.Terrain;
40import com.jme3.terrain.geomipmap.TerrainQuad;
41import java.io.IOException;
42
43
44/**
45 * Just multiplies the terrain patch size by 2. So every two
46 * patches away the camera is, the LOD changes.
47 *
48 * Set it higher to have the LOD change less frequently.
49 *
50 * @author bowens
51 */
52public class SimpleLodThreshold implements LodThreshold {
53
54    private int size; // size of a terrain patch
55    private float lodMultiplier = 2;
56
57
58    public SimpleLodThreshold() {
59    }
60
61    public SimpleLodThreshold(Terrain terrain) {
62        if (terrain instanceof TerrainQuad)
63            this.size = ((TerrainQuad)terrain).getPatchSize();
64    }
65
66    public SimpleLodThreshold(int patchSize, float lodMultiplier) {
67        this.size = patchSize;
68    }
69
70    public float getLodMultiplier() {
71        return lodMultiplier;
72    }
73
74    public void setLodMultiplier(float lodMultiplier) {
75        this.lodMultiplier = lodMultiplier;
76    }
77
78    public int getSize() {
79        return size;
80    }
81
82    public void setSize(int size) {
83        this.size = size;
84    }
85
86
87    public float getLodDistanceThreshold() {
88        return size*lodMultiplier;
89    }
90
91    public void write(JmeExporter ex) throws IOException {
92        OutputCapsule oc = ex.getCapsule(this);
93        oc.write(size, "size", 16);
94        oc.write(lodMultiplier, "lodMultiplier", 2);
95    }
96
97    public void read(JmeImporter im) throws IOException {
98        InputCapsule ic = im.getCapsule(this);
99        size = ic.readInt("size", 16);
100        lodMultiplier = ic.readInt("lodMultiplier", 2);
101    }
102
103    @Override
104    public LodThreshold clone() {
105        SimpleLodThreshold clone = new SimpleLodThreshold();
106        clone.size = size;
107        clone.lodMultiplier = lodMultiplier;
108
109        return clone;
110    }
111
112    @Override
113    public String toString() {
114        return "SimpleLodThreshold "+size+", "+lodMultiplier;
115    }
116}
117