util.c: floating point timers for game loop

src/util.h

@@ -118,4 +118,14 @@ typedef struct fvec2 {
 void tick_timer(int *value);
 
 
+/* decrements a floating point second-based timer, stopping at 0.0 */
+/* meant for poll based real time logic in game logic */
+/* note that it should be decremented only on the next tick after its creation */
+void tick_ftimer(float *value);
+
+/* same as `tick_ftimer` but instaed of clamping it repeats */
+/* returns true if value was cycled */
+bool tick_ftimer_repeat(float *value, float at);
+
+
 #endif