game pausing

timer.h

@@ -4,12 +4,17 @@
 #include <stdio.h>
 #include <sys/time.h>
 
-extern struct timeval start_time;
+typedef enum TimerState {
+  TIMER_RUNNING,
+  TIMER_PAUSED,
+  TIMER_STOPPED,
+} TimerState;
 
 typedef struct Timer {
-  float time;
+  float start;
+  float elapsed;
   float duration;
-  bool is_running;
+  TimerState state;
 } Timer;
 
 double get_time();
@@ -20,3 +25,5 @@ void timer_stop(Timer *timer);
 void timer_reset(Timer *timer);
 float timer_remaining(Timer *timer);
 float timer_elapsed(Timer *timer);
+void timer_pause(Timer *timer);
+void timer_resume(Timer *timer);