1/*
2* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
3*
4* This software is provided 'as-is', without any express or implied
5* warranty. In no event will the authors be held liable for any damages
6* arising from the use of this software.
7* Permission is granted to anyone to use this software for any purpose,
8* including commercial applications, and to alter it and redistribute it
9* freely, subject to the following restrictions:
10* 1. The origin of this software must not be misrepresented; you must not
11* claim that you wrote the original software. If you use this software
12* in a product, an acknowledgment in the product documentation would be
13* appreciated but is not required.
14* 2. Altered source versions must be plainly marked as such, and must not be
15* misrepresented as being the original software.
16* 3. This notice may not be removed or altered from any source distribution.
17*/
18
19#include <Box2D/Dynamics/b2WorldCallbacks.h>
20#include <Box2D/Dynamics/b2Fixture.h>
21
22// Return true if contact calculations should be performed between these two shapes.
23// If you implement your own collision filter you may want to build from this implementation.
24bool b2ContactFilter::ShouldCollide(b2Fixture* fixtureA, b2Fixture* fixtureB)
25{
26 const b2Filter& filterA = fixtureA->GetFilterData();
27 const b2Filter& filterB = fixtureB->GetFilterData();
28
29 if (filterA.groupIndex == filterB.groupIndex && filterA.groupIndex != 0)
30 {
31 return filterA.groupIndex > 0;
32 }
33
34 bool collide = (filterA.maskBits & filterB.categoryBits) != 0 && (filterA.categoryBits & filterB.maskBits) != 0;
35 return collide;
36}
37