compute best axis on host and OpenCL for 1-axis SAP, based on best variance

src/Bullet3OpenCL/ParallelPrimitives/b3PrefixScanFloat4CL.h

@@ -0,0 +1,38 @@
+
+#ifndef B3_PREFIX_SCAN_CL_H
+#define B3_PREFIX_SCAN_CL_H
+
+#include "b3OpenCLArray.h"
+#include "b3BufferInfoCL.h"
+#include "Bullet3Common/b3AlignedObjectArray.h"
+#include "Bullet3Common/b3Vector3.h"
+
+class b3PrefixScanFloat4CL
+{
+	enum
+	{
+		BLOCK_SIZE = 128
+	};
+
+//	Option m_option;
+
+	cl_command_queue	m_commandQueue;
+
+	cl_kernel m_localScanKernel;
+	cl_kernel m_blockSumKernel;
+	cl_kernel m_propagationKernel;
+
+	b3OpenCLArray<b3Vector3>* m_workBuffer;
+
+
+	public:
+		
+	b3PrefixScanFloat4CL(cl_context ctx, cl_device_id device, cl_command_queue queue,int size=0);
+
+	virtual ~b3PrefixScanFloat4CL();
+
+	void execute(b3OpenCLArray<b3Vector3>& src, b3OpenCLArray<b3Vector3>& dst, int n, b3Vector3* sum = 0);
+	void executeHost(b3AlignedObjectArray<b3Vector3>& src, b3AlignedObjectArray<b3Vector3>& dst, int n, b3Vector3* sum);
+};
+
+#endif //B3_PREFIX_SCAN_CL_H