1/**
2 * Copyright (c) 2011, Novyon Events
3 *
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * - Redistributions of source code must retain the above copyright notice, this
10 * list of conditions and the following disclaimer.
11 *
12 * - Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * @author Anthyon
29 */
30package com.jme3.terrain.noise.filter;
31
32import java.nio.FloatBuffer;
33import java.util.ArrayList;
34import java.util.List;
35
36import com.jme3.terrain.noise.Filter;
37
38public class IterativeFilter extends AbstractFilter {
39
40	private int iterations;
41
42	private List<Filter> preIterateFilters = new ArrayList<Filter>();
43	private List<Filter> postIterateFilters = new ArrayList<Filter>();
44	private Filter filter;
45
46	@Override
47	public int getMargin(int size, int margin) {
48		if (!this.isEnabled()) {
49			return margin;
50		}
51		for (Filter f : this.preIterateFilters) {
52			margin = f.getMargin(size, margin);
53		}
54		margin = this.filter.getMargin(size, margin);
55		for (Filter f : this.postIterateFilters) {
56			margin = f.getMargin(size, margin);
57		}
58		return this.iterations * margin + super.getMargin(size, margin);
59	}
60
61	public void setIterations(int iterations) {
62		this.iterations = iterations;
63	}
64
65	public int getIterations() {
66		return this.iterations;
67	}
68
69	public IterativeFilter addPostIterateFilter(Filter filter) {
70		this.postIterateFilters.add(filter);
71		return this;
72	}
73
74	public IterativeFilter addPreIterateFilter(Filter filter) {
75		this.preIterateFilters.add(filter);
76		return this;
77	}
78
79	public void setFilter(Filter filter) {
80		this.filter = filter;
81	}
82
83	@Override
84	public FloatBuffer filter(float sx, float sy, float base, FloatBuffer data, int size) {
85		if (!this.isEnabled()) {
86			return data;
87		}
88		FloatBuffer retval = data;
89
90		for (int i = 0; i < this.iterations; i++) {
91			for (Filter f : this.preIterateFilters) {
92				retval = f.doFilter(sx, sy, base, retval, size);
93			}
94			retval = this.filter.doFilter(sx, sy, base, retval, size);
95			for (Filter f : this.postIterateFilters) {
96				retval = f.doFilter(sx, sy, base, retval, size);
97			}
98		}
99
100		return retval;
101	}
102}
103