ksys: Implement Timer

src/KingSystem/System/Timer.cpp

@@ -1 +1,22 @@
 #include "KingSystem/System/Timer.h"
+#include "KingSystem/System/VFR.h"
+
+namespace ksys {
+
+void Timer::update(f32* t, f32 rate) {
+    *t += VFR::instance()->getDeltaTime() * rate;
+}
+
+void Timer::update() {
+    previous_value = value;
+    update(&value, rate);
+}
+
+bool Timer::hasEnded(f32 end_time) const {
+    if (value == end_time)
+        return true;
+
+    return (previous_value - end_time) * (value - end_time) < 0.0;
+}
+
+}  // namespace ksys

src/KingSystem/System/Timer.h

@@ -6,21 +6,21 @@ namespace ksys {
 
 struct Timer {
     Timer() = default;
-    Timer(f32 value, f32 previous_value, f32 speed = -1.0)
-        : value(value), previous_value(previous_value), speed(speed) {}
+    Timer(f32 value, f32 previous_value, f32 rate = -1.0)
+        : value(value), previous_value(previous_value), rate(rate) {}
 
-    void reset(f32 value_, f32 speed_ = -1.0) {
+    void reset(f32 value_, f32 rate_ = -1.0) {
         value = previous_value = value_;
-        speed = speed_;
+        rate = rate_;
     }
 
     void update();
-    static void update(f32& t);
+    static void update(f32* t, f32 rate);
     bool hasEnded(f32 end_time) const;
 
     f32 value{};
     f32 previous_value{};
-    f32 speed{};
+    f32 rate{};
 };
 
 }  // namespace ksys