Added a cmake option to disable keyboard grabbing on linux. Enabled b…

…y default.

Fixes OpenDungeons#293

CMakeLists.txt

@@ -47,6 +47,18 @@ if(OD_BUILD_TESTING)
     include(CTest)
 endif()
 
+# Linux option - Do not grab the keyboard when using OIS
+# This is breking the game's input on certain linux distributions and thus, must stay an option for now...
+option(OD_LINUX_NO_KEYBOARD_GRAB "Do not grab keyboard input when using OIS under Linux. Permits input in other applications." ON)
+
+# Defines the value for the preprocessor.
+if(OD_LINUX_NO_KEYBOARD_GRAB)
+    set(OD_NO_KEYBOARD_GRAB)
+    message(STATUS "Linux (OIS): x11_keyboard_grab = false")
+else()
+    message(STATUS "Linux (OIS): x11_keyboard_grab = true")
+endif()
+
 ##################################
 #### Useful variables ############
 ##################################

source/modes/InputManager.cpp

@@ -58,7 +58,11 @@ InputManager::InputManager(Ogre::RenderWindow* renderWindow):
 #elif defined OIS_LINUX_PLATFORM
     paramList.insert(std::make_pair(std::string("x11_mouse_grab"), std::string("false")));
     paramList.insert(std::make_pair(std::string("x11_mouse_hide"), std::string("false")));
+#if defined OD_NO_KEYBOARD_GRAB
+    paramList.insert(std::make_pair(std::string("x11_keyboard_grab"), std::string("false")));
+#else
     paramList.insert(std::make_pair(std::string("x11_keyboard_grab"), std::string("true")));
+#endif
     paramList.insert(std::make_pair(std::string("XAutoRepeatOn"), std::string("true")));
 #endif