basic game logic with simple translation animation

timer.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <stdbool.h>
+
+typedef enum TimerState {
+  TIMER_RUNNING,
+  TIMER_PAUSED,
+  TIMER_STOPPED,
+} TimerState;
+
+typedef struct Timer {
+  double start;
+  double elapsed;
+  float duration;
+  TimerState state;
+} Timer;
+
+double get_time(void);
+void start_internal_timer(void);
+bool timer_ended(Timer *timer);
+void timer_start(Timer *timer, float duration);
+void timer_stop(Timer *timer);
+void timer_reset(Timer *timer);
+double timer_remaining(Timer *timer);
+double timer_elapsed(Timer *timer);
+void timer_pause(Timer *timer);
+void timer_resume(Timer *timer);