feat(fsm): make the special state "quit" exit the fsm.

game/state/machine/machine.go

@@ -32,17 +32,21 @@ func (m *Machine) Switch(name string) {
 }
 
 // Update ticks the current state, then applies any queued transition.
-func (m *Machine) Update(delta float32) {
+func (m *Machine) Update(delta float32) bool {
 	if m.current == nil {
-		return
+		return false
 	}
 	m.current.Update(m, delta)
 
 	if m.pending != "" {
+		if m.pending == "quit" {
+			return false
+		}
 		next := m.pending
 		m.pending = ""
 		m.switchNow(next)
 	}
+	return true
 }
 
 // Render proxies to current state.

main.go

@@ -43,7 +43,9 @@ func main() {
 	// Enter game loop
 	for !rl.WindowShouldClose() {
 		audio.Update()
-		fsm.Update(rl.GetFrameTime())
+		if !fsm.Update(rl.GetFrameTime()) {
+			break
+		}
 		fsm.Render()
 	}
 }