1 files changed, 36 insertions, 0 deletions
diff --git a/src/3rdparty/Box2D/Dynamics/b2WorldCallbacks.cpp b/src/3rdparty/Box2D/Dynamics/b2WorldCallbacks.cpp
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+++ b/src/3rdparty/Box2D/Dynamics/b2WorldCallbacks.cpp
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+/*
+* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
+*
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 1. The origin of this software must not be misrepresented; you must not
+* claim that you wrote the original software. If you use this software
+* in a product, an acknowledgment in the product documentation would be
+* appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+* misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "Box2D/Dynamics/b2WorldCallbacks.h"
+#include "Box2D/Dynamics/b2Fixture.h"
+
+// Return true if contact calculations should be performed between these two shapes.
+// If you implement your own collision filter you may want to build from this implementation.
+bool b2ContactFilter::ShouldCollide(b2Fixture* fixtureA, b2Fixture* fixtureB)
+{
+	const b2Filter& filterA = fixtureA->GetFilterData();
+	const b2Filter& filterB = fixtureB->GetFilterData();
+
+	if (filterA.groupIndex == filterB.groupIndex && filterA.groupIndex != 0)
+	{
+		return filterA.groupIndex > 0;
+	}
+
+	bool collide = (filterA.maskBits & filterB.categoryBits) != 0 && (filterA.categoryBits & filterB.maskBits) != 0;
+	return collide;
+}