Add window position information

include/window.h

@@ -37,6 +37,8 @@ struct rect {
 
 struct window {
   u32 id;
+  u64 x;
+  u64 y;
   u64 width;
   u64 height;
   const char *title;
@@ -52,7 +54,8 @@ struct colour {
   };
 };
 
-bool init_window(window_t *wnd, const char *title, u64 width, u64 height);
+bool init_window(window_t *wnd, const char *title, u32 width, u32 height, i32 x,
+                 i32 y);
 void cleanup_window(window_t *wnd);
 void clear_window(const window_t *wnd, colour_t colour);
 void swap_buffers(const window_t *wnd);