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diff --git a/extern/bullet2/BulletMultiThreaded/btGpuUtilsSharedDefs.h b/extern/bullet2/BulletMultiThreaded/btGpuUtilsSharedDefs.h
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+++ b/extern/bullet2/BulletMultiThreaded/btGpuUtilsSharedDefs.h
@@ -0,0 +1,52 @@
+/*
+Bullet Continuous Collision Detection and Physics Library, http://bulletphysics.org
+Copyright (C) 2006, 2007 Sony Computer Entertainment Inc. 
+
+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.
+*/
+
+// Shared definitions for GPU-based utilities
+
+//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+//  Keep this file free from Bullet headers
+//  it is included into both CUDA and CPU code
+//	file with definitions of BT_GPU_xxx should be included first
+//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+
+#ifndef BTGPUUTILSDHAREDDEFS_H
+#define BTGPUUTILSDHAREDDEFS_H
+
+
+extern "C"
+{
+
+
+//Round a / b to nearest higher integer value
+int BT_GPU_PREF(iDivUp)(int a, int b);
+
+// compute grid and thread block size for a given number of elements
+void BT_GPU_PREF(computeGridSize)(int n, int blockSize, int &numBlocks, int &numThreads);
+
+void BT_GPU_PREF(allocateArray)(void** devPtr, unsigned int size);
+void BT_GPU_PREF(freeArray)(void* devPtr);
+void BT_GPU_PREF(copyArrayFromDevice)(void* host, const void* device, unsigned int size);
+void BT_GPU_PREF(copyArrayToDevice)(void* device, const void* host, unsigned int size);
+void BT_GPU_PREF(registerGLBufferObject(unsigned int vbo));
+void* BT_GPU_PREF(mapGLBufferObject(unsigned int vbo));
+void BT_GPU_PREF(unmapGLBufferObject(unsigned int vbo));
+
+
+} // extern "C"
+
+
+#endif // BTGPUUTILSDHAREDDEFS_H
+