cui: add calculation mode to Help->About.

Change-Id: I4765436bed8a58c5097afcf7dce768d3ec325015
Reviewed-on: https://gerrit.libreoffice.org/26964Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

cui/source/dialogs/about.cxx

@@ -47,6 +47,8 @@
 #include <sfx2/app.hxx>
 #include <rtl/ustrbuf.hxx>
 #include <vcl/bitmap.hxx>
+
+#include <opencl/openclwrapper.hxx>
 #include <officecfg/Office/Common.hxx>
 
 using namespace ::com::sun::star::uno;
@@ -302,6 +304,17 @@ OUString AboutDialog::GetVersionString()
         sVersion += m_aLocaleStr.replaceAll("$LOCALE", aLocaleStr);
     }
 
+    OUString aCalcMode = "Calc: "; // Calc calculation mode
+    bool bSWInterp = officecfg::Office::Common::Misc::UseSwInterpreter::get();
+    bool bOpenCL = opencl::GPUEnv::isOpenCLEnabled();
+    if (bOpenCL)
+        aCalcMode += "CL";
+    else if (bSWInterp)
+        aCalcMode += "group";
+    else
+        aCalcMode += "single";
+    sVersion += "; " + aCalcMode;
+
     return sVersion;
 }