d3d11-nv12 interop

fixed issues with ocl nv12 cvt kernel

finisged ocl nv12-to-rgba kernel, update dx-interop samples. (ocl rgba-to-nv12 kernel will be added later)

an attempt to fix build issue

fix for non opencl build issue

fix typo

fix compilation warnings

fix compile issue for Mac (OpenCL)

add convertion from rgba to nv12 (still need to debug kernel)

remove empty line at the EOF

fixed compilation warning

samples/directx/d3d9ex_interop.cpp

@@ -108,7 +108,7 @@ public:
         if (!m_cap.read(m_frame_bgr))
             return -1;
 
-        cv::cvtColor(m_frame_bgr, m_frame_rgba, CV_RGB2RGBA);
+        cv::cvtColor(m_frame_bgr, m_frame_rgba, CV_BGR2BGRA);
 
         D3DLOCKED_RECT memDesc = { 0, NULL };
         RECT rc = { 0, 0, m_width, m_height };
@@ -143,6 +143,9 @@ public:
             if (m_shutdown)
                 return 0;
 
+            // capture user input once
+            MODE mode = m_mode == MODE_GPU_NV12 ? MODE_GPU_RGBA : m_mode;
+
             HRESULT r;
             LPDIRECT3DSURFACE9 pSurface;
 
@@ -154,7 +157,7 @@ public:
 
             m_timer.start();
 
-            switch (m_mode)
+            switch (mode)
             {
                 case MODE_CPU:
                 {
@@ -185,7 +188,7 @@ public:
                     break;
                 }
 
-                case MODE_GPU:
+                case MODE_GPU_RGBA:
                 {
                     // process video frame on GPU
                     cv::UMat u;