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diff --git a/extern/bullet2/src/BulletDynamics/ConstraintSolver/btBatchedConstraints.h b/extern/bullet2/src/BulletDynamics/ConstraintSolver/btBatchedConstraints.h
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+++ b/extern/bullet2/src/BulletDynamics/ConstraintSolver/btBatchedConstraints.h
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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+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.
+*/
+
+#ifndef BT_BATCHED_CONSTRAINTS_H
+#define BT_BATCHED_CONSTRAINTS_H
+
+#include "LinearMath/btThreads.h"
+#include "LinearMath/btAlignedObjectArray.h"
+#include "BulletDynamics/ConstraintSolver/btSolverBody.h"
+#include "BulletDynamics/ConstraintSolver/btSolverConstraint.h"
+
+class btIDebugDraw;
+
+struct btBatchedConstraints
+{
+	enum BatchingMethod
+	{
+		BATCHING_METHOD_SPATIAL_GRID_2D,
+		BATCHING_METHOD_SPATIAL_GRID_3D,
+		BATCHING_METHOD_COUNT
+	};
+	struct Range
+	{
+		int begin;
+		int end;
+
+		Range() : begin(0), end(0) {}
+		Range(int _beg, int _end) : begin(_beg), end(_end) {}
+	};
+
+	btAlignedObjectArray<int> m_constraintIndices;
+	btAlignedObjectArray<Range> m_batches;        // each batch is a range of indices in the m_constraintIndices array
+	btAlignedObjectArray<Range> m_phases;         // each phase is range of indices in the m_batches array
+	btAlignedObjectArray<char> m_phaseGrainSize;  // max grain size for each phase
+	btAlignedObjectArray<int> m_phaseOrder;       // phases can be done in any order, so we can randomize the order here
+	btIDebugDraw* m_debugDrawer;
+
+	static bool s_debugDrawBatches;
+
+	btBatchedConstraints() { m_debugDrawer = NULL; }
+	void setup(btConstraintArray* constraints,
+			   const btAlignedObjectArray<btSolverBody>& bodies,
+			   BatchingMethod batchingMethod,
+			   int minBatchSize,
+			   int maxBatchSize,
+			   btAlignedObjectArray<char>* scratchMemory);
+	bool validate(btConstraintArray* constraints, const btAlignedObjectArray<btSolverBody>& bodies) const;
+};
+
+#endif  // BT_BATCHED_CONSTRAINTS_H