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 */
32package com.jme3.bullet.collision.shapes;
33
34import com.bulletphysics.collision.shapes.BvhTriangleMeshShape;
35import com.bulletphysics.collision.shapes.IndexedMesh;
36import com.bulletphysics.collision.shapes.TriangleIndexVertexArray;
37import com.jme3.bullet.util.Converter;
38import com.jme3.export.InputCapsule;
39import com.jme3.export.JmeExporter;
40import com.jme3.export.JmeImporter;
41import com.jme3.export.OutputCapsule;
42import com.jme3.math.Vector3f;
43import com.jme3.scene.Mesh;
44import java.io.IOException;
45import java.nio.ByteBuffer;
46
47/**
48 * Basic mesh collision shape
49 * @author normenhansen
50 */
51public class MeshCollisionShape extends CollisionShape {
52
53    protected int numVertices, numTriangles, vertexStride, triangleIndexStride;
54    protected ByteBuffer triangleIndexBase, vertexBase;
55    protected IndexedMesh bulletMesh;
56
57    public MeshCollisionShape() {
58    }
59
60    /**
61     * creates a collision shape from the given TriMesh
62     * @param mesh the TriMesh to use
63     */
64    public MeshCollisionShape(Mesh mesh) {
65        createCollisionMesh(mesh, new Vector3f(1, 1, 1));
66    }
67
68    private void createCollisionMesh(Mesh mesh, Vector3f worldScale) {
69        this.scale = worldScale;
70        bulletMesh = Converter.convert(mesh);
71        this.numVertices = bulletMesh.numVertices;
72        this.numTriangles = bulletMesh.numTriangles;
73        this.vertexStride = bulletMesh.vertexStride;
74        this.triangleIndexStride = bulletMesh.triangleIndexStride;
75        this.triangleIndexBase = bulletMesh.triangleIndexBase;
76        this.vertexBase = bulletMesh.vertexBase;
77        createShape();
78    }
79
80    /**
81     * creates a jme mesh from the collision shape, only needed for debugging
82     */
83    public Mesh createJmeMesh(){
84        return Converter.convert(bulletMesh);
85    }
86
87    public void write(JmeExporter ex) throws IOException {
88        super.write(ex);
89        OutputCapsule capsule = ex.getCapsule(this);
90        capsule.write(numVertices, "numVertices", 0);
91        capsule.write(numTriangles, "numTriangles", 0);
92        capsule.write(vertexStride, "vertexStride", 0);
93        capsule.write(triangleIndexStride, "triangleIndexStride", 0);
94
95        capsule.write(triangleIndexBase.array(), "triangleIndexBase", new byte[0]);
96        capsule.write(vertexBase.array(), "vertexBase", new byte[0]);
97    }
98
99    public void read(JmeImporter im) throws IOException {
100        super.read(im);
101        InputCapsule capsule = im.getCapsule(this);
102        numVertices = capsule.readInt("numVertices", 0);
103        numTriangles = capsule.readInt("numTriangles", 0);
104        vertexStride = capsule.readInt("vertexStride", 0);
105        triangleIndexStride = capsule.readInt("triangleIndexStride", 0);
106
107        triangleIndexBase = ByteBuffer.wrap(capsule.readByteArray("triangleIndexBase", new byte[0]));
108        vertexBase = ByteBuffer.wrap(capsule.readByteArray("vertexBase", new byte[0]));
109        createShape();
110    }
111
112    protected void createShape() {
113        bulletMesh = new IndexedMesh();
114        bulletMesh.numVertices = numVertices;
115        bulletMesh.numTriangles = numTriangles;
116        bulletMesh.vertexStride = vertexStride;
117        bulletMesh.triangleIndexStride = triangleIndexStride;
118        bulletMesh.triangleIndexBase = triangleIndexBase;
119        bulletMesh.vertexBase = vertexBase;
120        bulletMesh.triangleIndexBase = triangleIndexBase;
121        TriangleIndexVertexArray tiv = new TriangleIndexVertexArray(numTriangles, triangleIndexBase, triangleIndexStride, numVertices, vertexBase, vertexStride);
122        cShape = new BvhTriangleMeshShape(tiv, true);
123        cShape.setLocalScaling(Converter.convert(getScale()));
124        cShape.setMargin(margin);
125    }
126}
127