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diff --git a/samples/hellovr_opengl/hellovr_opengl_main.cpp b/samples/hellovr_opengl/hellovr_opengl_main.cpp
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index 64d1d47..dac2e9f 100644
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--- a/samples/hellovr_opengl/hellovr_opengl_main.cpp
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+++ b/samples/hellovr_opengl/hellovr_opengl_main.cpp
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@@ -1276,6 +1276,12 @@ bool CMainApplication::SetupStereoRenderTargets()
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return true;
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}
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+//http://www.g-truc.net/post-0708.html
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+template <typename T, std::size_t N>
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+constexpr std::size_t _countof(T const (&)[N]) noexcept
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+{
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+return N;
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+}
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//-----------------------------------------------------------------------------
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// Purpose:
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