1 files changed, 66 insertions, 0 deletions

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+#ifndef INPUT_LAG_H_DF16F381
+#define INPUT_LAG_H_DF16F381
+
+/**
+ * Helper class that handles key repeat.
+ */
+class InputLag {
+public:
+
+  bool isActive() const
+  {
+    return active_;
+  }
+
+  void reset()
+  {
+    accum_ = 0.0;
+    active_ = false;
+    repeat_ = false;
+  }
+
+  void accumulate(double dt)
+  {
+    accum_ += dt;
+  }
+
+  bool step()
+  {
+    if (!active_)
+    {
+      active_ = true;
+
+      return true;
+    } else if (!repeat_)
+    {
+      if (accum_ > delay_)
+      {
+        accum_ -= delay_;
+        repeat_ = true;
+
+        return true;
+      }
+    } else {
+      if (accum_ > tick_)
+      {
+        accum_ -= tick_;
+
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+private:
+
+  double tick_ = 1.0 / 15.0;
+  double delay_ = tick_ * 3.0;
+
+  double accum_ = 0.0;
+  bool active_ = false;
+  bool repeat_ = false;
+
+};
+
+#endif /* end of include guard: INPUT_LAG_H_DF16F381 */