First gpu code draft. Interface might be significantly changed in future.

Simple implementation of StereoBM_GPU.
It is excluded from compilation now.

modules/gpu/cuda/cuda_shared.hpp

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+/*M///////////////////////////////////////////////////////////////////////////////////////
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+//                For Open Source Computer Vision Library
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+
+#ifndef __OPENCV_CUDA_SHARED_HPP__
+#define __OPENCV_CUDA_SHARED_HPP__
+
+#include "opencv2/gpu/devmem2d.hpp"
+
+namespace cv
+{
+    namespace gpu
+    {   
+        typedef unsigned char uchar;
+        typedef unsigned short ushort;
+        typedef unsigned int uint;
+
+        namespace impl
+        {   
+            static inline int divUp(int a, int b) { return (a % b == 0) ? a/b : a/b + 1; }
+
+            extern "C" void stereoBM_GPU(const DevMem2D& left, const DevMem2D& right, DevMem2D& disp, int maxdisp, DevMem2D_<uint>& minSSD_buf);
+        }
+    }
+}
+
+#endif /* __OPENCV_CUDA_SHARED_HPP__ */