Add a monotonically incrementing counter to UpdateWindows calls

This is for checking draw cache validity
2018-01-18 20:00:20 +00:00
parent 4bad77cdf0
commit 8ab6522e7c
3 changed files with 20 additions and 0 deletions
--- a/src/window_gui.h
+++ b/src/window_gui.h
@@ -149,6 +149,18 @@ extern Window *_z_front_window;
 extern Window *_z_back_window;
 extern Window *_focused_window;

+inline uint64 GetWindowUpdateNumber()
+{
+	extern uint64 _window_update_number;
+	return _window_update_number;
+}
+
+inline void IncrementWindowUpdateNumber()
+{
+	extern uint64 _window_update_number;
+	_window_update_number++;
+}
+

 /** How do we the window to be placed? */
 enum WindowPosition {