Initial timer implementation.

src/timers.odin

@@ -0,0 +1,59 @@
+package game
+
+// Purpose of Timer: a small reusable piece of state that tracks:
+// "how much time has passed of a set duration,"
+// (spawning, cooldowns, etc.) can ask "has my interval finished yet"
+// without each system hand-rolling its own countdown variable.
+Timer :: struct {
+    active:   bool,
+    fired: 	  bool,
+    loop:     bool,
+    elapsed:  f32,
+    duration: f32
+}
+
+init_timer :: proc(duration: f32, looping:bool) -> Timer {
+    timer := Timer{
+        active = true,
+        loop = looping,
+       	duration = duration,
+   } 
+
+    return timer
+}
+
+reset_timer :: proc(timer: ^Timer) {
+    timer.active  = true
+    timer.fired   = false
+    timer.elapsed = 0
+}
+
+// returns true when the timer has just fired this frame
+update_timer :: proc(timer: ^Timer, dt: f32) -> bool {
+
+    if timer.active {
+        // increment the timer
+        timer.elapsed += dt
+
+        if timer.elapsed >= timer.duration {
+            timer.fired = true
+
+            // reset timer now
+			// @NOTE:
+            // dont set to 0 use the timers duration
+            // accounts leftover overshoot time isn't lost
+            // keeps long-term timing accurate rather than drifting
+            timer.elapsed -= timer.duration
+
+            // Deactivate 1 shot timers
+            if timer.loop == false {
+                timer.active = false
+            }
+
+            return true 
+        }
+    }
+
+    return false 
+
+}