-const int S_MOUSE1 = 1;
-const int S_MOUSE2 = 2;
-const int S_MOUSE3 = 4;
-int mouseClicked;
-int prevMouseClicked; // previous state
-float prevMouseClickedTime; // time during previous left mouse click, to check for doubleclicks
-vector prevMouseClickedPos; // pos during previous left mouse click, to check for doubleclicks
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