opencv

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if(WIN32)
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  try_compile(__VALID_DIRECTX
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    "${OpenCV_BINARY_DIR}"
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    "${OpenCV_SOURCE_DIR}/cmake/checks/directx.cpp"
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    LINK_LIBRARIES d3d11
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    OUTPUT_VARIABLE TRY_OUT
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  )
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  if(NOT __VALID_DIRECTX)
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    message(STATUS "No support for DirectX (install Windows 8 SDK)")
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    return()
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  endif()
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  try_compile(__VALID_DIRECTX_NV12
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    "${OpenCV_BINARY_DIR}"
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    "${OpenCV_SOURCE_DIR}/cmake/checks/directx.cpp"
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    COMPILE_DEFINITIONS "-DCHECK_NV12"
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    LINK_LIBRARIES d3d11
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    OUTPUT_VARIABLE TRY_OUT
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  )
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  if(__VALID_DIRECTX_NV12)
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    set(HAVE_DIRECTX_NV12 ON)
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  else()
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    message(STATUS "No support for DirectX NV12 format (install Windows 8 SDK)")
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  endif()
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  set(HAVE_DIRECTX ON)
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  set(HAVE_D3D11 ON)
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  set(HAVE_D3D10 ON)
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  set(HAVE_D3D9 ON)
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  if(HAVE_OPENCL AND WITH_OPENCL_D3D11_NV AND EXISTS "${OPENCL_INCLUDE_DIR}/CL/cl_d3d11_ext.h")
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    set(HAVE_OPENCL_D3D11_NV ON)
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  endif()
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endif()
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