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 abstract class AbstractFilter implements Filter {
39
40	protected List<Filter> preFilters = new ArrayList<Filter>();
41	protected List<Filter> postFilters = new ArrayList<Filter>();
42
43	private boolean enabled = true;
44
45	@Override
46	public Filter addPreFilter(Filter filter) {
47		this.preFilters.add(filter);
48		return this;
49	}
50
51	@Override
52	public Filter addPostFilter(Filter filter) {
53		this.postFilters.add(filter);
54		return this;
55	}
56
57	@Override
58	public FloatBuffer doFilter(float sx, float sy, float base, FloatBuffer data, int size) {
59		if (!this.isEnabled()) {
60			return data;
61		}
62		FloatBuffer retval = data;
63		for (Filter f : this.preFilters) {
64			retval = f.doFilter(sx, sy, base, retval, size);
65		}
66		retval = this.filter(sx, sy, base, retval, size);
67		for (Filter f : this.postFilters) {
68			retval = f.doFilter(sx, sy, base, retval, size);
69		}
70		return retval;
71	}
72
73	public abstract FloatBuffer filter(float sx, float sy, float base, FloatBuffer buffer, int size);
74
75	@Override
76	public int getMargin(int size, int margin) {
77		// TODO sums up all the margins from filters... maybe there's a more
78		// efficient algorithm
79		if (!this.isEnabled()) {
80			return margin;
81		}
82		for (Filter f : this.preFilters) {
83			margin = f.getMargin(size, margin);
84		}
85		for (Filter f : this.postFilters) {
86			margin = f.getMargin(size, margin);
87		}
88		return margin;
89	}
90
91	@Override
92	public boolean isEnabled() {
93		return this.enabled;
94	}
95
96	public void setEnabled(boolean enabled) {
97		this.enabled = enabled;
98	}
99
100}
101