Added MiniCL, a limited subset of OpenCL, the open standard for parallel programming of heterogeneous systems.

MiniCL includes a cross-platform run-time frontend based on pthreads, Win32 Threads, or libspe2 for Cell SPU.
It is there, to bridge the gap until OpenCL is more widely available.

See Bullet/Demos/VectorAdd, influenced by NVidia OpenCL Jumpstart Guide:
http://developer.download.nvidia.com/OpenCL/NVIDIA_OpenCL_JumpStart_Guide.pdf

src/BulletMultiThreaded/MiniCLTask/MiniCLTask.h

@@ -0,0 +1,81 @@
+/*
+Bullet Continuous Collision Detection and Physics Library, Copyright (c) 2007 Erwin Coumans
+
+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 MINICL__TASK_H
+#define MINICL__TASK_H
+
+#include "../PlatformDefinitions.h"
+#include "LinearMath/btScalar.h"
+
+#include "LinearMath/btAlignedAllocator.h"
+
+
+enum
+{
+	CMD_MINICL_1= 1,
+	CMD_MINICL_ADDVECTOR
+};
+
+
+
+struct float8
+{
+	float s0;
+	float s1;
+	float s2;
+	float s3;
+	float s4;
+	float s5;
+	float s6;
+	float s7;
+
+	float8(float scalar)
+	{
+		s0=s1=s2=s3=s4=s5=s6=s7=scalar;
+	}
+};
+
+#define MINICL_MAX_ARGLENGTH 128
+#define MINI_CL_MAX_ARG 8
+
+ATTRIBUTE_ALIGNED16(struct) MiniCLTaskDesc
+{
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+
+	MiniCLTaskDesc()
+	{
+		for (int i=0;i<MINI_CL_MAX_ARG;i++)
+		{
+			m_argSizes[i]=0;
+		}
+	}
+
+	uint32_t	m_taskId;
+
+	uint32_t	m_kernelProgramId;
+	uint32_t	m_firstWorkUnit;
+	uint32_t	m_lastWorkUnit;
+
+	char		m_argData[MINI_CL_MAX_ARG][MINICL_MAX_ARGLENGTH];
+	int			m_argSizes[MINI_CL_MAX_ARG];
+};
+
+
+void	processMiniCLTask(void* userPtr, void* lsMemory);
+void*	createMiniCLLocalStoreMemory();
+
+
+#endif //MINICL__TASK_H
+